REVIEWED BLD2024-0476+Manufacturer_Specifications_and_Installation_Instructions+4.10.2024_7.43.17_AM+4187099RECEIVED
Apr 11 2024
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Service Manual
BLD2024-047
Ductless Air Conditioner /Heat Pump
Multi Zone Outdoor Units
Climate 5000 Series
® sosm
u
REVIEWED
BY
CITY OF EDMONDS
A WARNING:
► Installation must be performed by a licensed
contractor, and per the instructions in the
installation manual. Improper installation can
cause water leakage, electrical shock, or fire.
► In North America, installation must
be performed in accordance with the
requirement of NEC (National Electric Code)
and CEC (Canadian Electric Code) by licensed
and qualified personnel only.
► Only contact a licensed contractor for repair
or maintenance of this unit.
Service Manual BOSCH
(�J BOSCH
Service Manual
Table of Contents
1 Key to Symbols and Safety Instructions 4
1.1 Key to Symbols 4
1.2 Safety 4
2 Part Names and Model Numbers 6
2.1 Outdoor Models 6
2.2 Indoor Models 6
2.3 Multizone Configurations 6
3 Dimensions 9
3.1 Outdoor Unit 9
4
Refrigerant Cycle Diagrams - Outdoor Models
10
4.1
For Model: 18K Multi Zone Regular System
BMS500-AAM018-1CSXRC
10
4.2
For Model: 18K Multi ZoneMax Performance System
3MS500-AAM018-1CSXHC
10
4.3
For Models: 27K Multi Zone Regular, 27K Multi Zone
Max Performance System BMS500-AAM027-1CSXRC,
BMS500-AAM027-1CSXHC
11
4.4
For Models: 36K Multi Zone Regular System
3MS500-AAM036-1CSXRC
11
4.5
For Model: 36K Multi Zone Max Performance System
3MS500-AAM036-1CSXHC
12
4.6
For Model: 48K Multi Zone Regular System
BMS500-AAM048-1CSXRC
12
4.7
For Model: 48K Multi Zone Max Performance System
BMS500-AAM048-1CSXHC
13
5
Wiring Diagrams
14
5.1
For Model: 18K Multi Zone Regular System
BMS500-AAM018-1CSXRC
14
5.2
For Model: 18K Multi Zone Max Performance System
BMS500-AAM018-1CSXHC
15
5.3
For Models: 27K Multi Zone Regular Heat & Max Performance
System BMS500-AAM027-1CSXRC,
3MS500-AAM027-1CSXHC
16
5.4
For Model: 36K Multi Zone Regular System
BMS500-AAM036-1CSXRC
17
5.5
For Model: 36K Multi Zone Max Performance System
BMS500-AAM036-1CSXHC
18
5.6
For Model: 48K Multi Zone Regular System
BMS500-AAM048-1CSXRC
19
5.7
For Model: 48K Multi Zone Max Performance System
BMS500-AAM048-1CSXHC
20
6
Installation Details
21
6.1
Torque Requirements
21
6.2
Connecting the Cables
21
6.3
Pipe Length and the Elevation
21
6.4
First Time Installation
22
6.5
Adding the Refrigerant to an Existing System
22
6.6
Collecting the Refrigerant Into the Outdoor Unit
24
6.7
Evacuation of the Complete Refrigeration Circuit, Indoor and
Outdoor Unit.
24
6.8
Operation Characteristics
25
7
Electronic Functions
26
7.1
Abbreviation
26
7.2
Electric Control Working Environment
26
7.3
Main Protection
26
7.4
Control and Functions
28
8
Troubleshooting
37
8.1
Multi Zone Outdoor Unit Error Codes
38
8.2
Quick Check by Error Codes
39
8.3
ODU PCB & IPM
40
8.4
Outdoor Unit Display
47
8.5
Diagnosis and Solution
52
9 Disassembly Guide 87
9.1 Outdoor Unit- BMS500-AAM018-1CSXRC 87
9.2 Outdoor Unit - 13MS500-AAM027-1CSXRC,
BMS500-AAM018-1CSXHC, BMS500-AAM027-1CSXHC 91
9.3 Outdoor Unit - BMS500-AAM036-1CSXHC,
BMS500-AAM048-1CSXRC, 13MS500-AAM048-1CSXHC 97
Service Manual
® BOSCH
1 Key to Symbols and Safety Instructions
1.1 KeytoSymbols
Warnings
Warnings in this document are identified by a
warning triangle printed against a grey background.
Keywords at the start of a warning indicate the type and seriousness
of the ensuing risk if measures to prevent the risk are not taken.
The following keywords are defined and can be used in this document:
► DANGER indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
► WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
► CAUTION indicates a hazardous situation which, if not avoided, could
result in minor to moderate injury.
► NOTICE is used to address practices not related to personal injury
Important information
This symbol indicates important information where there is no risk to
1 people or property.
1.2 Safety
Please read safety precautions before installation
Incorrect installation due to ignoring instructions can cause serious damage or
injury.
WARNING: ELECTRICAL HAZARD
► Do not modify the length of the power supply cord or use an
extension cord to power the unit.
► Do not share the electrical outlet with other appliances.
Improper or insufficient power supply can cause fire or
electrical shock.
A
WARNING: INSTALLATION REQUIREMENTS
► Installation must be performed by a licensed contractor,
and per the instructions in the installation manual. Improper
installation can cause water leakage, electrical shock, or fire.
► In North America, installation must be performed in
accordance with the requirement of NEC (National Electric
Code) and CEC (Canadian Electric Code) by licensed and
qualified personnel only.
► Only contact a licensed contractor for repair or maintenance
of this unit.
► Only use the included accessories, parts, and specified
parts for installation. Using non-standard parts can cause
water leakage, electrical shock, fire, and can cause the unit
to fail.
► Install the unit in a solid location that can support the unit's
weight. If the chosen location cannot support the unit's
weight, or the installation is not done properly, the unit may
drop and cause serious injury and/or damage.
WARNING:
► This product can expose you to chemicals including Lead
and Lead components, which are known to the State
of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.
P65Warnings.ca.gov.
BOSCH
Service Manual
WARNING: ELECTRICAL HAZARD
' ► For all electrical work, follow all local and national wiring
standards, regulations, and the Installation Manual.
The power supply to the outdoor unit requires a service
disconnect at the unit. Only use a dedicated circuit. Never
share a power source connected to this system. Insufficient
electrical capacity or defects in electrical work can cause
electrical shock or fire.
► For all electrical work, use the specified cables. Connect
cables tightly, and clamp them securely to prevent external
forces from damaging the terminal. Improper electrical
connections can overheat and cause fire, and may also
cause shock.
► All wiring must be properly arranged to ensure that the
control board cover can close properly. If the control board
cover is not closed properly, it can lead to corrosion and
cause the connection points on the terminal to heat up,
catch fire, or cause electrical shock.
► In certain functional environments, such as kitchens, server
rooms, etc., the use of specially designed air-conditioning
units are highly recommended.
► If the power supply cord is damaged, it must be replaced
by the manufacturer, its service agent or similarly qualified
persons such as a licensed electrician in order to avoid a
hazard.
► The product must be properly grounded at the time of
installation, or electrical shock may occur.
WARNING: FIRE HAZARD
' ► For units that have an auxiliary electric heater, do not
install the unit within 1 meter (3 feet) of any combustible
materials.
► Do not install the unit in a location that may be exposed
to combustible gas leaks. If combustible gas accumulates
around the unit, it may cause fire.
► Do not operate your air conditioner in a wet room such as a
bathroom or laundry room. Too much exposure to water can
cause electrical components to short circuit.
NOTICE: PROPERTY DAMAGE
► Install condensate drainage piping according to the
instructions in this manual. Improper condensate drainage
may cause water damage to your home and property.
CAUTION: CONTAINS REFRIGERANT
A ► This air-conditioning unit contains fluorinated gases. For
specific information on the type of gas and the amount,
please refer to the relevant label on the outdoor unit itself.
► Installation, service, maintenance and repair of this unit
must be performed by a certified technician.
► Product removal and recycling must be performed by a
certified technician.
► If the system has a leak -detection system installed, it must
be checked for leaks at least every 12 months.
► When the unit is checked for leaks, proper record -keeping of
all checks is required.
Service Manual
(W BOSCH
2
Part Names and Model Numbers
2.1
Outdoor Models
p.city
MaxZone
Regular OutdooOutdoor
18K
2
BMS500-AAM018-1CSXRC
BMS500-AAM018-1CSXHC
27K
3
BMS500-AAM027-1CSXRC
BMS500-AAM027-1CSXHC
208-230V
36K
4
BMS500-AAM036-1CSXRC
BMS500-AAM036-1CSXHC
48K
5
BMS500-AAM048-1CSXRC
BMS500-AAM048-1CSXHC
Table 1
2.2 Indoor Models
115V 12K
BMS500-AAS012-OAHWXC
—
—
6K
BMS500-AA0006-IAHWXC
—
—
9K
BMS500-AA0009-IAHWXC
BMS500-AA0009-IAHCXB
BMS500-AA0009-IAHDXB
12K
BMS500-AAU012-lAHWXC
BMS500-AAU012-IAHCXB
BMS500-AAU012-IAHDXB
208-230V 18K
BMS500-AAU018-IAHWXC
BMS500-AAU018-IAHCXB
BMS500-AAU018-IAHDXB
24K
BMS500-AAU024-lAHWXC
BMS500-AAU024-lAHCXC
BMS500-AAU024-IAHDXB
30K
BMS500-AAU030-IAHWXC
—
—
36K
BMS500-AAU036-lAHWXC
BMS500-AAU036-lAHCXC
BMS500-AAU036-IAHDXB
Table 2
1 For Indoor Units, please refer to Indoor Unit Service Manual.
2.3 Multizone Configurations
Table 3
BOSCH
Service Manual
36K
Table 4
6+18
6+6+12
6+6+6+6
6+24
6+6+18
6+6+6+9
9+18
6+6+24
6+6+6+12
9+24
6+9+12
6+6+6+18
12+12
6+9+18
6+6+6+24
12+18
6+9+24
6+6+9+9
12+24
6+12+12
6+6+9+12
18+18
6+12+18
6+6+9+18
18+24
6+12+24
6+6+9+24
24+24
6+18+18
6+6+12+12
6+18+24
6+6+12+18
9+9+9
6+6+12+24
9+9+12
6+9+9+9
9+9+18
6+9+9+12
9+9+24
6+9+9+18
9+12+12
6+9+9+24
9+12+18
6+9+12+12
9+12+24
6+9+12+18
9+18+18
6+12+12+12
12+12+12
6+12+12+18
12+12+18
9+9+9+9
12+12+24
9+9+9+12
12+18+18
9+9+9+18
9+9+12+12
9+9+12+18
9+12+12+12
12+12+12+12
Service Manual
W) BOSCH
48K
Table 5
9+24
6.6+24
6.6+6+18
6+6+6.6+9
9+30
6+6+30
6+6+6+24
6+6+6+6+12
9+36
6+6+36
6+6+6+30
6+6+6+6+18
12+24
6+9+24
6+6+6+36
6+6+6+6+24
12+30
6+9+30
6+6+9+18
6+6+6+6+30
12+36
6+9+36
6+6+9+24
6+6+6+6+36
18+18
6+12+18
6+6+9+30
6+6+6+9+9
18+24
6+12+24
6+6+9+36
6+6+6+9+12
18+30
6+12+30
6+6+12+12
6+6+6+9+18
18+36
6+12+36
6+6+12+18
6+6+6+9+24
24+30
6+18+18
6+6+12+24
6+6+6+9+30
24+36
6+18+24
6+6+12+30
6+6+6+9+36
30+30
6+18+30
6+6+12+36
6+6+6+12+12
6+18+36
6+6+18+18
6+6+6+12+18
6+24+24
6+6+18+24
6+6+6+12+24
6+24+30
6+6+18+30
6+6+6+12+30
9+9+18
6+6+24+24
6+6+6+18+18
9+9+24
6+9+9+12
6+6+6+18+24
9+9+30
6+9+9+18
6+6+9+9+9
9+9+36
6+9+9+24
6+6+9+9+12
9+12+12
6+9+9+30
6+6+9+9+18
9+12+18
6+9+9+36
6+6+9+9+24
9+12+24
6+9+12+12
6+6+9+9+30
9+12+30
6+9+12+18
6+6+9+12+12
9+12+36
6+9+12+24
6+6+9+12+18
9+18+18
6+9+12+30
6+6+9+12+24
9+18+24
6+9+12+36
6+6+9+12+30
9+18+30
6+9+18+18
6+6+9+18+18
9+18+36
6+9+18+24
6+6+9+18+24
9+24+24
6+9+18+30
6+6+12+12+12
9+24+30
6+12+12+12
6+6+12+12+18
12+12+12
6+12+12+18
6+6+12+12+24
12+12+18
6+12+12+24
6+6+12+18+18
12+12+24
6+12+12+30
6+9+9+9+9
12+12+30
6+12+18+18
6+9+9+9+12
12+12+36
6+12+18+24
6+9+9+9+18
12+18+18
9+9+9+9
6+9+9+9+24
12+18+24
9+9+9+12
6+9+9+9+30
12+18+30
9+9+9+18
6+9+9+12+12
12+24+24
9+9+9+24
6+9+9+12+18
18+18+18
9+9+9+30
6+9+9+12+24
18+18+24
9+9+9+36
6+9+9+18+18
9+9+12+12
6+9+12+12+12
9+9+12+18
6+9+12+12+18
9+9+12+24
6+9+12+12+24
9+9+12+30
6+12+12+12+12
9+9+18+18
6+12+12+12+18
9+9+18+24
9+9+9+9+9
9+12+12+12
9+9+9+9+12
9+12+12+18
9+9+9+9+18
9+12+12+24
9+9+9+9+24
9+12+12+30
9+9+9+12+12
9+12+18+18
9+9+9+12+18
9+12+18+24
9+9+9+12+24
12+12+12+12
9+9+12+12+12
12+12+12+18
9+9+12+12+18
12+12+12+24
9+12+12+12+12
12+12+18+18
12+12+12+12+12
BOSCH
Service Manual
3 Dimensions
3.1 Outdoor Unit
Split type outdoor unit mounting dimensions
Figure 1
BMS500-AAM018-1CSXRC
BMS 500-AAM018-1CSXHC,
BMS 500-AAM027-1CSXRC,
BMS500-AAM027-1CSXHC,
BMS500-AAM036-1CSXRC
BMS500-AAM036-1CSXHC,
BMS500-AAM048- iCSXRC,
BMS500-AAM048-1CSXHC
iauie 0
890x673x342 (35.0426.5x13.46)
946x810x410 (37.2431.89x16.14)
952x1333x415 (37.48x52.48x16.34)
663 (26.1)
673 (26.5)
634 (24.96)
354 (13.94)
403 (15.87)
404 (15.9)
Service Manual
® BOSCH
4 Refrigerant Cycle Diagrams -Outdoor Models
4.1 For Model:18K Multi Zone Regular System
BMS500-AAM018-1CSXRC
HEAT
EXCHANGE
((EVAPORATOR)
I T2 Evaporatoro�
temp. sensor 4
middle
Figure 2
o T1 Room
temp. sensor
OUTDOOR
F_ 7
LIQUID VALVE A EXV A
EXV B
LIQUID VALVE B CAPILLARYTUBE + T3
---0 Condenser
n temp. sensor
T4 Ambient o HEAT
temp. sensor EXCHANGE
(CONDENSER)
T213-A Evaporator
GAS VALVE A temp. sensor outlet
~— 4-WAY VALVE
GAS VALVE B T28-B
o� COOLING
T2g_ Accumulator �1 High pressure
-C switch --HEATING
---0 oT5 Discharge
Low pressure temp. sensor
switch Compressor
4.2 For Model:18K Multi ZoneMax Performance System
BMS500-AAM018.11CSXHC
INDOOR
F
HEAT
EXCHANGE
((EVAPORATOR) oT
temmp.p.sensor
T2 Evaporator c
temp. sensor
middle 4
L J
Figure 3
OUTDOOR
LIQUID VALVE A EXV A
EXV B
LIQUID VALVE B -
� CAPILLARY TUBE I T3
b Condenser
o temp. sensor
T4 Ambient o HEAT
temp. sensor EXCHANGE
(CONDENSER)
T2B-A Evaporator
GAS VALVE A temp. sensor outlet
o � I i l_ b
4 _B b -WAY VALVE
GAS VALVE B T2B
o a' COOLING
TIAccumulator a �t High pressure
C switch 4---HEATING
---0 oT5 Discharge
Low pressure temp. sensor
switch Compressor
L— — — — — — — — — — — —
(�J BOSCH
Service Manual
4.3 For Models: 27K Multi Zone Regular, 27K Multi Zone
Max Performance System BMS500-AAM027-1CSXRC,
BMS500-AAM027-ICSXHC
INDOOR
OUTDOOR
I
I
I
EX_VA
LIQUID VALVE A
XV B
LIQUID VALVE B
�
--EXVC
CAPILLARYTUBE
�T3
LIQUID VALVE C
Condenser
o temp. sensor
I
HEAT
EXCHANGE p T1 Room
(EVAPORATOR)
T4 Ambient o
HEAT
EXCHANGE
temp. sensor
temp. sensor
(CONDENSER)
T2B-A Evaporator
T2 Evaporator o
GAS VALVE A temp. sensor outlet
temp. sensor
middle
o�
�__
GAS VALVE B
T
o24-WAY
VALVE
GAS VALVE C T2B-C Amumuistor
-'t High pressure
COOLING
o
switch
+--HEATING
--
---0 pT5 Discharge
Lmpressum
temp. sensor
swifth
Compressor
J
L — — —
— — —
Figure 4
4.4 For Models: 36K Multi Zone Regular System
BMS500-AAM036-iCSXRC
INDOOR
OUTDOOR
EXV A
LIQUID VALVE A
-0
I
LIQUID VALVE B EXV B
-- EXV C0__+0T5Discharge
VALVE CAPILLARY
_LIQUID
TUBE
T3Condenser
EXV Dotemp.
sensor
LIQUID VALVE D
HEAT
EXCHANGE
(EVAPORATOR)
❑T1 Room
T4 Ambient n
HEAT
EXCHANGE
temp. sensor
temp. sensor(CONDENSER)
T28-A EvaporatorGAS
VALVE A temp. sensor outletT2
Evaporator
o
temp. sensor
GAS VALVE B T2B-B
middle
o�
b
bF
VALVE C T2B-C
VALVEGAS
o
AccumulatorressureT2B
COOLING
�
Db--HEATING
GAS VALVED
rgeLow
~
pressuror
switch
Compressor
L
J
L—
— — —
Figure 5
Service Manual
BOSCH
4.5 For Model: 36K Multi Zone Max Performance System
BMS500-AAM036-1CSXHC
INDOOR
OUTDOOR
EXV A
LIQUID VALVE A 4
--0
Radiator forlPM
B
LIQUID VALVE B
�EXV
EXV F
--0
EXV C
LIQUID VALVE C
4
i
-0
T3
-0
Condenser
EXV D
E] temp. sensor
LIQUID VALVE D 4
HEAT
EXCHANGE
(EVAPORATOR)
o T1 Room
T4 Ambient o
HEAT
EXCHANGE
temp. sensor
temp. sensor
(CONDENSER)
T213-A Evaporator
GAS VALVE A temp. sensor outlet
o�
T2 Evaporator
4---
temp. sensor
I
GAS VALVE B T2B-B
middle
GAS VALVE C T213-C
4-WAY VALVE
o 4
, High
COOLING
7A=m�ulator
1
pressure
switch
4---HEATING
GAS VALVE D o2�
--0
oT5 Discharge
pressure
temp. sensor
h
Compressor
J
L
— —
Figure 6
4.6 For Model: 48K Multi Zone Regular System
BMS500-AAM048-1CSXRC
INDOOR
OUTDOOR
EXV A—
LIQUID VALVE A
EXV B
LIQUID VALVE B
Radiator for IPM
--0
EXV C
EXV F
LIQUID VALVE C
EXV D
b
T3
LIQUID VALVE D
Condenser
❑temp. sensor
EXV E
LIQUID VALVE E
HEAT
-0
EXCHANGE
(EVAPORATOR)
❑T1 Room
T4Ambiento
HEAT
EXCHANGE
temp. sensor
temp. sensor
(CONDENSER)
T213-A
Evaporator
GAS VALVE A temp. sensor outlet
o�
a--
T2 Evaporator
o
GAS VALVE B 02 13-13
temp. sensor
middle Q
GAS VALVE C T2B-C
b
❑
4-WAY VALVE
GAS VALVE D T26-D
High pressureCOOLING
WAccumulator,
wath
a —HEATING
oT5 Discharge
GAS VALVE E T2B-E
temp. sensor
o�
Compressor
Figure 7
BOSCH
Service Manual
4.7 For Model: 48K Multi Zone Max Performance System
BMS500-AAM048.1CSXHC
INDOOR
HEAT
EXCHANGE
(EVAPORATOR) ,T1 Room
temp. sensor
T2 Evaporator,
temp. sensor
middle 4
I— — — — — — — — J
Figure 8
OUTDOOR
EXV A — — — — — — — —
LIQUID VALVE A
EXV B
LIQUID VALVE B
---
Radiator for IPIA
Plate heat EXV G
---0
exchanger
EXV IF
LIQUID VALVE C
EXV C
EXV D
--0
b
T3
LIQUID VALVE D
Condenser
CHECK VALVE
, temp. sensor
_-0
EXV E
LIQUID VALVE E
T4 Ambient,
HEAT
temp. sensor
EXCHANGE
(CONDENSER)
T26-A
Evaporator
GAS VALVE A temp. sensor outlet
4---
GAS VALVE B T26-13
T2B-C
��GAS
a-- 4
b
VALVE C
,
4-WAY VALVE
a
GAS VALVE D T2B-D
Accumulator High High pressure
COOLING
�
switch
--HEATING
b--
-0
oT5 Discharge
GAS VALVE E T26-E
Low pressure temp. sensor
, �
switch Compressor
b—
L—
— —
— — —
— — — —
Service Manual
0 BOSCH
5 Wiring Diagrams
5.1 For Model:18K Multi Zone Regular System
BMS500-AAM018-1CSXRC
-- - - -
,
W OPTIONAL I
COMP V RED OUTDOOR DC FAN: 73 T4 TP
YIG
U BL E I 2 r aPrlOnAl:
FM1 I 9 11 Ton TEMPI—TURE I
I Q I I COMPRESSOR P
0 �
II COMPTOP
REDI
3 I II O I
I
_
I 1 BLACK'
BLUE
_ _ _ _ _ _RI
RED
I OPTIONAL
I HEAT_Y
Compressor Crankcase Heater
BLACK
— — — _ _ _ _ _
RED
: OPTIONAL_
HEAT_D
I Base Pan Heater _ I
BLACK
BLUE
I SV 4-WAY
, I
BLUE
I OPTIONAL
I NOTE:Four-wayvalve
is used in the
Cooling S Heating
unit only
L____________I
CODE
PART NAME
COMP
COMPRESSOR
Cti
AC CURRENT
DETECTOR
EEV
ELECTRONIC
EXPANSION VALVE
FM1
OUTDOOR DC
FAN MOTOR
HEAT_D
CHASSIS HEATER
HEAT_Y
CRANKCASE HEATER
HIGH PRESSURE
H-PRO
SWITCH
L-PRO
LOW PRESSURE
SWITCH
SV
REVERSEVALVE
TIP
DISCHARGE
TEMP.
TEMP. SENSOR
T3
COIL TEMP. SENSOR
T4
OUTDOORAMBIENT
TEMP. SENSOR
COMP TOP
COMP. TOP OLP
TEMP. SENSOR
Figure 9
MAIN BOARD
ON
AUXILIARY BOARD
Dotes:
Items listed as OPTIONAL depend on
the specific model installed.
CODE:16022000035644
OPTIONALI OPTIONALI
PIPE EEV it EEV
IP II
I 6 II 6 I
A
BOSCH
Service Manual
5.2 For Model:18K Multi Zone Max Performance System
BMS500-AAM018-iCSXHC
r--I
Notes: F_ _ _I
Items listed as OPTIONAL depend on
the specific model installed.
...
16022300002514
A
B C
RED(BROWN)
;............'I
zs
INDOOR PIPE
BLUE
o
OUT TEMP
4 Y
OUTDOOR AMBIENT
T4 TEMPERATURE SENSOR
i CN12 i'',
CN14
CN15
CONDENSER
C\29 ,,CIrnRLQP
LOW/HIGH
T26
T3 TEMPERATURE SENSOR
L-OUT `....---
.......
z
DISCHARGE SENSOR
DISCHARGE
CN4 CNS
RY2 MAIN BOARD
ELECTRONIC
VALVEI
6 EXPANSIVE
I PM BOARD
VALVE
CN1
5
VALVE-B
s ELECTRONIC
EXPANSIVE
CN2 CN3
VALVE
a ELECTRONIC
VALVE -A
EXPANSIVE
IT
VALVE
U V W
BLCE BLUE
P-1 ..........
Pl RED-------.
I
BLUE RED BLACK
CN14
Y/G
L1-IN L2-IN S-A S-B 5-C 7-------------•
; P2 OPTIONALI f
P-z
CN3 CN4 N N o
------- ---- ---
4-WAY
HEATI HEAT2
:OPTIONAL
L
MIX
CNb CN5 CN9 CNS
Y/G
REACTOR V (S)
DC FAN Y
m s
rU(R) rim
mw�
FnF2
W(C)
COMPRESSOR
o
o
O O
i OPT
______}NOTE: I. Use the magnetic ring
I
Fo
a m
c 8H i
not soPplied,opemm` part)
- to hitch the connectivecable
a
TO A TO B TO C
g g
" Iy
OPTIONAL
ofindoor and outdoor units
Y/G
_
•----••----••----�-
„_ after installation. one magnetic
--,
—
POWER
SUPPLY
REACTOR2 R05094A OPTIONAL2
ring is used for one cable.
2.Choosing OPTIONAL of
7
----- OPTION --is either-ordec-----
Figure 10
Service Manual
BOSCH
5.3 For Models: 27K Multi Zone Regular Heat & Max Performance
System BMS500•AAM027.1CSXRC, BMS500•AAM027•iCSXHC
Notes:
This symbol indicates field wiring
aItems listed as OPTIONAL depend on
the specific model installed.
RED(BROWN)
ti ti
IPM BOARD
CN1
CN2 CN3
U V W
BLUE BLUE ^l 1 ^l 1
AIIIFI REOI BLACK
OPTIONAL
REACTOR V(S) DC FAN
COMPRESSOR
Y/G
Figure 11
Y/G
16022300000873
A03 B
izs
INDOOR PIPE
o
OUT TEMP
4
OUTDOOR AMBIENT
T4 TEMPERATURE SENSOR
CN12 i E
CN14 CN15
CONDENSER
CPmpTop
LOW/HIGH T2B
T3 TEMPERATURE SENSOR
—OUT """""""""""""'
z
U
DISCHARGE SENSOR
RY2 MAIN
BOARD
ELECTRONIC
VALVE—B a EXPANSIVE
r—FIVALVE
VALVE —A = ELECT
RONIC
s EXPANSIVE
P-1 P1 ` U VALVE
RED f
S A S—B P2
4—WAY HEATI HEAT2
A
l....s.; ......... ---
NOTE:Usethe magneticdng
(not supplied optional part)
TO A TO B I
E OPTIONAL
' to hitch the connective cable I
of indoor and outdoor units
:.....................................€ after installation. one magnetic
Y/G Y/G ring is used for one cable.
REACTOR2 R05094A OPTIONAL i--------------------------
(�J BOSCH
5.4 For Model: 36K Multi Zone Regular System
BMS500-AAM036.1CSXRC
Service Manual
Notes:
This symbol indicates field wiring
TItems listed as OPTIONAL depend on
the specific model installed. 16022300002633
A B C D
RED (BROWN)
BLACK(BLUE) ',W o I I I I 'INDOORPIPE
OUTDOOR AMBIENT
T4 TEMPERATURE SENSOR
CN14 CN15 CONDENSER
LN29
CwPToL•,
'', T2B T3 TEMPERATURE SENSOR
�05
L-OUT:............. :...........................:
OPIHIGH
z DISCHARGE SENSOR
CN4
oo(a)
RY2 MAIN
BOARD U
ELECTRONIC
a
VALVE-D EXPANSIVE
I PM BOARD
VALVE
ELECTRONIC
5
s
VALVE-C EXPANSIVE
CN1
VALVE
CN2
CN3
ELECTRONIC
s
VALVE-B EXPANSIVE
VALVE
U V IN
m g ELECTRONIC
RLNE
BLUE
P-1
VALVE -A EXPANSIVE
P1I!r VALVE
BLUE RED BLACK CN1�
L-IN
N-IN S-A
S-B S-C S-D
P2 P-2
Y/G C 3
CN4 N
N N O
4-WAY HEAT1 HEAT2
OPTIONAL
1
CN1 I CN2 CNb CN5 CN9 CNB Y/G
DC FAN
L
REACTOR
V(S)
U (R) IN (C)
O
O
COMPRESSOR
1B121B
___________________________ _
O
O
i _ __-NOTE:1.Usethemagneticring
w v s (not supplied, optional part)
to hitch the connective cable
ofindoorandoutdoorunits
'
Y/G
bPTIDNAL' OPTIONAL i
' afterins[alla[ion. one magnetic ;
POWER TO A
TO B
TO C TO D
t---------) I--------------------------t; ring is used for one cable.
SUPPLY
2.Choosing OPTIONALI or i
OPTIONAL2 is either-or decision.:)
(�
-----------------------------
Figure 12
Service Manual
BOSCH
5.5 For Model: 36K Multi Zone Max Performance System
BMS500•AAM036•iCSXHC
y� 1
YIG
1
YIG
1 X"
16022000036850
CN2 BI CK
eIACK P6
CN4
PS
0 0
CN3 RED
1
IED
CN3
CN1
B ACK
RED
CN2
OP110NAL
IPM&PFCBOARD
MAIN CONTROL BOARD
XT3
D
Notes:
S-D
al'
Items listed as OPTIONAL depend on
S-C
' hl
OeN
the specific model installed.
6LACK ED W
CN21
3 DC
ED V CN9 10
CN6
$-$
D �V
- -
D
____________,
CN29
S-A
9 BQAIV
CNB CNB I
KRLE'D
CN3]W
3o. XT293_______
I
_________________
0
BAOPTION4L
YIDCFAN1 DCFAN i
i CN19
RED WHITE lnc �EAanD
Applicable to the units I
BLAc13 --- oPT�wu
adopting DC motor only
I CN24
cNzs
RED reuwconkaze
RED r
pPl IONAL
_ _ _
I
_ _ _____________________________ .
HLUE O--AL —r
rP
CNB
I CN1]
BLUE 4-WAV SV wb�n mire slxmlrol
� mr
I
rRED
i3B�
CN31
ED
I
I
nNDgaa cDlL �
; � I
IwRITE ACFAN2 I
'
OUTIET 9
— B
CN36
gLgCK LUE
LT2P AHlSOR p
avTIaiAA______
I
__AI
CN32
IRED RE
___1
cN2]
ACFANI I I
I II B II II A l l Y"ieloe I Nr
CN34
IWHRE
I
II II II I
IBUICK WE I
16 I� 6 fi II fi II fi I I I�
�
� Applicable t0 the units I
<NXP rXPi
EEV EEV EEV EEV EEV
adopting AC motor only
II II I
IBEc1XCXICj BECTRBXIC BECiBdICIIgFCIAMICIIFIfC1ABXICI IavTloxul
IEXP.U'SIVE
-- —— OPTIOXRL----
ID➢WBIVE D➢WBIVE IFY➢AXBIYS I_--�
IYALYiF IIYALYEU IIVYVEI":
$
VkYEB -EA
I OP —A �Il ovTloxal NP xXt� attlalUi�IferIMNI
CODE
PART NAME
COMP
COMPRESSOR
CAPI,CAP2
FAN MOTOR CAPACITOR
CT1
AC CURRENT DETECTOR
EEv
ELECTRONIC ERANSIVE VALVE
DCFANI,DCFAN2
OUTDOOR DC FAN
ACFAN'I,ACFAN2
OUTDOOR AC FAN
H EAT_D
CHASSIS H@SER
H FAT_Y
CRANKCASE HEATER
H-PRO
HIGH PRESSURE SWITCH
L-PRO
LOW PRESSURE SWITCH
Sv
REVERSING VALVE
Tp
EXHAUST TEMPERATURE
SENSOR
T3
CONDENSER TEMPERATURE
SENSOR
T4
OUTDOOR AMBIENT
TEMPERATURE SENSOR
COIYP TOP
COW. TOP OLP TEMP. SEN SOR
T2B
INDOOR COIL OUTLET
TEMP.SENSOR
Figure 13
BOSCH
Service Manual
5.6 For Model: 48K Multi Zone Regular System
BMS500•AAM048•iCSXRC
CN2 EeHBACK
CN4
CN3 RED
RED
CN2
YIO d VIG YIG
10, 0
T1 16022000036851
Rs
BLACK e
CN3(D—
CN4 REU-------
OPTI—
XT2
l PEG BOARD MAIN CONTROL BOARD ox a
Notes: I I $$D ) SD
V crvsICE]
BLUE
S.B z+ (�
D ________,
2N28 3
r=�
r,I,�e
V CN8 CN8 I
CS-AN
N3 IiHnMX v
]
W U I I
O
3 XT3
COMP 3
-------
--------------- --I
I I
I
CN20 BLAC OPi IONAL I
roc DCFANi DCFAN
crvls
RED wHI� lr�c HEAT
Applicable to the units
cuzs Buc HEnr_v oPT�arau�
adopting DC motoronly:
CN24
RED REU ��� I
Vireo
CN18 BLUE OmI0NP1 I
tP
Cn8
II CNi]
BLUE 4-WAV SVuemnlemnreixm,rol
rRED
I -- — — —--- —ET31
INDOOR FAIL DE XWRITE
CN31
CN28
ED
ACFAN2 '
I WTLET O
ITEMP.SEN80R6
��
-3 I
CN36
LUE
BLACK BI
CN32
IRED
Nf II I
t �I B �� AS I ;n,T= tiIo
�
C1,127
CN34
N,NmE ACFANi
I
I I I
I' II I I I
I BUCK LU I
I fi II 6 I; fi
Applicable to the units I
adopting AC motor only
EEV FEV EEV
I II I�
EEV EEV EEV
I II II I
OVTIOxaL I
Iap.wwlglElEClaalglaEc,aoum BEUIBRIcI'aNIXMKN8Eci0.0XICl IOv,Inxu' b �
p AXSIVE pPAXSIYE EXPAMiIM pP� IVE IppNDIYE IEW� IVE
Iv4v[F 'IYALVEf 'X ' IIVUYta I I • 8
I WTIM4�I OPTIOXu�I 1', OPTIau OP IUL�IaPrlaw�'OP i I
I_'OXA�I
� ------------'
Figure 14
Items listed as OPTIONAL depend on
Eil the specific model installed.
CODE
PART NAME
COMP
COMPRESSOR
CAPI,CAP2
FAN MOTOR CAPACITOR
C71
AC CURRENT DETECTOR
EEV
ELECTRONIC ERANSIVE VALVE
DCFANI,DCFAN2
OUTDOOR DC FAN
ACFANI,ACFAN2
OUTDOOR AC FAN
HEAT—D
CHASSIS HEATER
HEAT_Y
CRANKCASE HEATER
H-PRO
HIGH PRESSURE SWITCH
L-PRO
LOW PRESSURE SWITCH
SV
REVERSING VALVE
TP
EXHAUST TEMPERATURE
SENSOR
T3
CONDENSER TEMPERATURE
SENSOR
T4
OUTDOORAMBIENT
TEMPERATURE SENSOR
COMP TOP
COMP. TOP OUP TEMP. SENSOR
T26
INDOOR COIL OUTLET
TEMP.SENSOR
Service Manual
5.7 For Model: 48K Multi Zone Max Performance System
BMS500-AAM048-iCSXHC
m RED
CN2
IPM&PFC BOARD
W
RED V CN9 D
BLUE N
V
W U
COMP
CNB CNS
I
I
I 3 3 1
1 1
I
DCFANI DCFAN 1
Applicable to the units
adopting DC motor only:
-_____116x___u _____I
BP
I
Applicable to the units adopting
IIII1III
Enhanced Vapor lnjevtion oVn.LLlyYEG
p:l'INDOOL
TEM
E
P
VIV
DPI—
I1III1I
rII I II
Figure 15
YID Q VID Q) -
XTi
I-ki 747 ] CN3 r----
BLACK
CN1 RED J L"------'
VIG xeoivxiM
P9
XT2
IL.IG D
S-E ewe c
CN13 -1
DAdba gun Vler � � 3 6 D
IJ XT3
---- — -----------DPilIX1-----
BLAC
*ITI D
RED WHITE "G 1
I Dasexanxeater
___CN25 BLAC __ _____re_0_—_I
I s
I �CN24 RED RED__ _ I
I CN18 BLUE —. I
PAIDI I�rU1 I CN11 BLUE 4WAV SVwenme`�im exakl
____________ - _ __
jXZDCBA I CN28 r--------ED -- n _'
I I RED
CN31
I I 1W., ACFAN2 1
I EI NDDDR A CN36 iBLACK LUE 1
PIPE oUT I I
Mu__ 1I CN32 �IED�-
-2
v-u--'I_-_+ _D _I II __DY GY C34 a
II I
I
s p s its q s i LIJE
Applicable to the units
'I :' : 1 0I 1 adopting AC motor only
1
I
EEV �j EEV A EEV q EEV ::III coP1 i P D Y
I
EC1P ICYtt CjIVALYE BVECIiVMV��UCTNNICIIDniDxAL1 viiox$1 1____—IDNAL_____-
8
_IIDPilaxul_ _ A LI — —A1
® BOSCH
16022000033589
Notes:
Items listed as 0P n0NAL depend on
the specific model installed.
CODE
PART NAME
COMP
COMPRESSOR
CAPI,CAP2
FAN MOTOR CAPACITOR
CT1
AC CURRENT DETECTOR
EEV
ELECTRIC EXPANSIVE VALVE
DCFANI,DCFAN2
OUTDOOR DC FAN
ACFANI,ACFAN2
OUTDOOR AC FAN
HEAT _D,HEAT_Y
CRANKCASE HEATING
H-PRO
HIGH PRESSURE SWITCH
L-PRO
LOW PRESSURE SWITCH
SV
4-WAY VALVE
PAIOI
EXHAUST TEMPERATURE
SENSOR
TS
CONDENSER TEMPERATURE
SENSOR
T4
OUTDOORAMBIENT
TEMPERATURE SENSOR
TH
HEAT INK
TEMPERATURE SENSOR
T2B
INDOOR CONDENSER
TEMPERATURE SENSOR
BOSCH
Service Manual
6 Installation Details
6.1 Torque Requirements
Capacity
Liquid side
vi tier ji,iameieror i „- I
Tightening Torque18k
2 x 1/4" / 2 x 06.35
27k
3x1/4"/3x06.35
0 6.35 (0 0.25")
1,500 (111b • ft)
1,600 (11.81b • ft)
36k
4 x 1/4" / 4 x 06.35
0 9.52 (0 0.375")
2,500 (18.41b • ft)
2,600 (19.181b • ft)
48k
5 x 1/4" / 5 x 06.35
012.7 ( 0 0.5")
3,500 (25.81b • ft)
3,600 (26.551b • ft)
Table 7 Table 10
6.2 Connecting the Cables
The power cord should be selected according to the following specifications sheet.
► Cable type: SOOW type
Additional Refrigerant Charge
2 x 3/8" / 2 x 09.52
3 x 3/8" / 3 x 09.52
4 x 3/8" / 4 x 09.52
3 x 3/8" + 2 x 1/2"
3x09.52+2x012.7
- FipleSize Additional charge tor each unit length
06.35 (1/4") liquid pipe 15g (0.161 oz)
09.52 (3/8") liquid pipe 30g (0.322 oz)
Table 11
18K ODU 14
27K ODU 14 1 For indoor units piping information, check correspondence indoor unit
36K ODU 12 manual.
48K ODU 1 10
Table 8
For IDU and ODU connection, use 16 AWG for all applications.
The cable sizes are determined by the maximum current indicated on the
nameplate which is located on the side panel of the unit. Please refer to the
nameplate before selecting the cable, fuse and switch. A means of disconnecting
the power, should be within 10 feet of the outdoor unit.
6.3 Pipe Length and the Elevation
Maximum Piping Length and Height Difference
Max. length for all rooms (m)
40 60
80
80
(131ft) (197ft)
(262ft)
(262ft)
Max. length for one IU (m)
25 30
35
35
(82ft) (98ft)
(115ft)
(115ft)
Max. height difference
15 15
15
15
between IU and OU (m)
(49.2ft) (49.2ft)
(49.2ft)
(49.2ft)
Max. height difference
10 10
10
10
between Us (m)
(33ft) (33ft)
(33ft)
(33ft)
Table 9
Service Manual
G BOSCH
6.4 First Time Installation
6.4.1 Air Purging with Vacuum Pump
(Indoor Unit)
(Liquid Side) (Outdoor Unit)
Liquid Service Line
cl"
(Gas Side)
Manifold Valve Gas Service Line
Compound Meter
Pressure
Gauge °O5e
/
i
-OAMPa
Handle Lo
Handle Hi
Shut -Off Knob
_ Shut -Off Knob High
Low Refrigerant—
Charge/Refrigerant Hose
Manifold/Blue
Vacuum
Pump
Vacuum
pump
Figure 16
1. Completely tighten the flare nuts of the indoor and outdoor units, confirm
that both the liquid service and gas service valves are set to the closed
position.
2. Connect the refrigerant manifold; blue hose with the shut-off knob of the low
side to the gas service valve port.
3. Connect the refrigerant manifold; yellow hose to the shut-off high side
connection to the vacuum pump.
4. Fully open the shut-off knob low side of the manifold valve.
5. Operate the vacuum pump to evacuate.
6. Perform evacuation for 30 minutes and check whether the refrigeration
low side pressure gauge indicates 350 -500 microns. If the meter does
not indicate 350 - 500 microns after evacuating for 30 minutes, it should
be evacuated 20 minutes more. If the pressure can't hold 350 - 500
microns after evacuating 50 minutes, please check if there are any leakage
points. Fully close the shut-off knob low side of the manifold and stop the
operation of the vacuum pump. Confirm that the gauge needle does not move
(approximately 5 minutes after turning off the vacuum pump).
7. Make sure the pressure display in the pressure indicator is a little higher than
the atmospheric pressure. Then remove the charge hose from the gas service
valve.
8. Fully open the liquid service valve and gas service valve and securely tighten
the cap of the gas service valve. System is now evacuated and charged.
(Ensure that the unit is charged per the defined specifications).
Gas leak check:
' — Required after completion of refrigerant line set installation
— Unit service valves remain closed to isolate refrigerant into
outdoor unit (condensing section)
— Line set and coil should be pressurized to at least 150 PSIG
using dry Nitrogen
— Check for leaks using bubble solution at each braze joint
6.5 Adding the Refrigerant to an Existing System
(Indoor Unit) (Liquid Side) (Outdoor Unit)
Liquid Service Line
open
(Gas Side)
Check Valve Gas Service Line
oce
Refrigerant
Cylinder
H
OPEN CLOSE
Electronic Scale
Figure 17
Procedure
1. Connect the refrigerant manifold, blue suction hose to the gas service valve's
service port, open the liquid service valve and the gas service valve. Connect
the refrigerant manifold, yellow hose to the valve at the top or bottom of the
cylinder. If the refrigerant is R410A, ensure that cylinder is placed upside
down during the charging process.
2. Purge the air from the refrigerant manifold (yellow hose). Open the valve at
the top or bottom of the cylinder and press the check valve on the refrigerant
manifold to purge the air.
QCAUTION: CONTAINS REFRIGERANT
► Liquid refrigerant can cause frost bite. Handle with care.
3. Place the refrigerant cylinder onto the electronic scale and record the weight.
4. Operate the air conditioner in cooling mode.
5. Open the valve (low side) on the refrigerant manifold and charge the system
with liquid refrigerant.
6. When the electronic scale displays the proper weight (refer to the gauge and
the pressure of the low side), turn off the refrigerant low side valve and the
refrigerant cylinder valve. Then turn off the unit to remove the hose from the
gas service valve.
7. Replace valve stem caps on the service port. Use a torque wrench to tighten
the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
Recover the refrigerant as per Refrigerant Recovery and Recycling
14-1 Equipment manufacturers' specification.
BOSCH
Refrigerant charging
(Indoor Unit) (Liquid Side) (Outdoor Unit)
Liquid Service Line
Open
(Gas Side)
sm
Gas Service Line
OpeRefriCylOSE
Figure 18
Procedure:
1. Connect the charge hose to the refrigerent cylinder, open the liquid and
the gas service valves. Connect the charge hose which you disconnected
from the vacuum pump to the valve at the top or bottom of the cylinder. If
the refrigerant is R41OA, make the cylinder is upside down to ensure liquid
charge.
2. Purge the air from the charge hose. Open the valve at the bottom of the
cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3. Put the charging cylinder onto the electronic scale and record the weight.
4. Open the valves (Low side) on the refrigerant manifold and charge the system
with liquid refrigerant. If the system cannot be charge with the specified
amount of refrigerant, or can be charged with a little at a time (approximately
150g each time) , operating the air conditioner in the cooling cycle; however,
if one time is not sufficient, wait approximately 1 minute and then repeat the
procedure.
5. When the electronic scale displays the proper weight, disconnect the charge
hose from the gas service valve's service port immediately. If the system has
been charged with liquid refrigerant while operating the air conditioner, turn
off the air conditioner before disconnecting the hose.
6. Replace valve stem caps on the service port. Use a torque wrench to tighten
the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
Service Manual
For model: BMS500-AAM048-ICSXHC
For above models, there is a set of master valve, which will allow installer to vacuum
and recycle the refrigerant at a faster speed. Ensure master valves are fully open
prior to system operation.
j1
I
IN
Figure 19
Service Manual
BOSCH
6.6 Collecting the Refrigerant Into the Outdoor Unit
rigure zu
Procedure
1. Confirm that both the 2 way and 3 way valves are set to the opened position
Remove the valve stem caps and confirm that the valve stems are in the
opened position. Be sure to use a hexagonal wrench to operate the valve
stems.
2. Connect the charge hose with the push pin of handle to to the 3 way valves
gas service port.
3. Air purging of the charge Open the handle Lo v alve of the manifold valve
slightly to purge air from the charge hose for 5 seconds and then close it
quickly.
4. Set t e 2 way valve to the close position.
5. Operate the air conditioner at the cooling cycle and stop it when the gauge
indicates 0.1MPa.
6. Set the 3 way valve to the closed position immediately. Do this quickly so that
the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and
tighten the 2 way and 3 way valve's stem nuts. Use a torque wrench to tighten
the 3 way valve's service port cap to a torque of 18N. Be sure to check for gas
leakage.
6.7 Evacuation of the Complete Refrigeration Circuit, Indoor and
Outdoor Unit.
rigure z1
Procedure
1. Confirm that both the 2-way and 3-way valves are set to the opened position.
2. Connect the vacuum pump to 3 way valve's service port.
3. Evacuation for approximately one hour. Confirm that the compound meter
indicates 0.iMpa ( 500 M icrons / 29.9 in,hg.
4. Close the valve (Low side) on the charge set, turn off the vacuum pump, and
confirm that the gauge needle does not move (approximately 5 minutes after
turning off the vacuum pump).
5. Disconnect the charge hose from the vacuum pump.
BOSCH
Service Manual
6.8 Operation Characteristics
Room Temp
Outdoor
Temperatur
Table 12
erature
COOLoperation
630E-90OF
170C-320C
HEAToperation
320E-86OF
OOC-300C
DRY operation
50OF-90OF
100C-320C
B M S 500-AAM 018-1 CSXRC
13MS500-AAM027-1CSXRC
-250C-500C
-250C-300C
OOC-500C
Regular
BMS500-AAM036-1CSXRC
-130E-1220F
-130E-860F
320E-122OF
B M S 500-AAM 048-1 CSXRC
e
13MS500-AAM018-1CSXHC
Max
BMS500-AAM027-1CSXHC
-300C-500C
-300C-300C
OOC-500C
Performance
BMS500-AAM036-ICSXHC
-220E-1220F
-220E-860F
320E-122OF
BMS500-AAM048-1 CSXHC
Equation to convert Celsius to Fahrenheit
(1) = 1.8 x (oQ + 32
NOTICE:
► If the system is used beyond the above conditions, certain
safety protection features may come into operation and
cause the unit to operate abnormally.
NOTICE:
► The room relative humidity should be less than 80%. If the
air conditioner operates beyond this figure, the surface of
the air conditioner may attract condensation. Please set the
vertical air flow louver to its maximum angle (vertically to the
floor), and set to HIGH fan mode.
► The optimum performance will be achieved during this
operating temperature zone.
Service Manual
® BOSCH
7 Electronic Functions
7.1 Abbreviation
T1: Indoor ambient temperature
T2: Middle indoor heat exchanger coil temperature
T2B: Indoor heat exchanger exhaust coil temperature (located on the outdoor unit)
T3: Outdoor heat exchanger pipe temperature
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
7.2 Electric Control Working Environment
Input voltage 230V
Input power frequency 60Hz
Indoor fan standard working amp. <1A
Outdoor fan standard working amp. <1.5A
Four-way valve standard amp. <1A
Table 13
7.3 Main Protection
7.3.1 Compressor Restart Delay
The compressor takes 1 minute to startup the first time. Further restarts take 3
minutes.
7.3.2 Temperature Protection of Compressor Discharge
When the discharge temperature of the compressor rises, the running frequency is
limited according to the following rules:
► If 105 °C (221 °F) <_ T5 < 110 °C (230 °F), maintain the current
frequency.
► If the temperature increases and T5 >_ 110 °C (230 oF), decrease the
frequency to a lower level every 2 minutes to F1.
► If T5 >_ 115 °C (239 °F) for 10 seconds, the compressor stops and then
restart until T5 < 90 °C (194 °F).
7.3.3 Fan Speed Malfunction
If outdoor fan speed is lower than 100RPM or higher than 240ORPM for 60
seconds or more, the unit stops and LED displays failure code.
7.3.4 Inverter Module Protection
The inverter protection module ensures that faults related to current, voltage, or
temperature does not damage the inverter.
If these protections are triggered, the A/C unit stops and the LED displays the
failure code.
The unit restarts 3 minutes after the protection mechanism has turned off.
7.3.5 Low Voltage Protection
If low voltage protection triggers and voltage is not restored to normal within 3
minutes, the protection remains active even after a machine restart.
VOLTAGE ij No limit
VOLT _LTM_FRE 1 ADD
VOLT LTM FREQ2 DID
Figure 22
If low voltage protection triggers and voltage is not restored to normal
' within 3 minutes, the protection remains active even after a machine
restart.
BOSCH
Service Manual
7.3.6 Compressor Current Limit Protection
The temperature interval for the current limit is the same as the range of the T4
frequency limit.
Cooling mode:
°C
Coo1T4Z ne5I
50
................... .
49
45
Coo11' one4I
44
......
41
40
Coo T4Zone3I.............. .........
33
32
....................
Coo T4Zone2I
CoolReturnl
The difference between current limit and shutdown current
CooIT4Zone51
Cooling T4;50°C current limit value
CooIT4Zone41
Cooling 49>T4—>45°C current limit value
CooIT4Zone31
Cooling 44>T4341 °C current limit value
CooIT4Zone21
Cooling 40 > T4>33°C current limit value
CooIT4Zone11
Cooling 32>T4°C current limit value
CoolStopl
Cooling stop protection current value
Figure 23
Heating mode:
For other models:
l5
l,I
HeatT4Zone4I
10
9
HeatT4Zone3I
6
5
HeatT4Zone2I
HeatT4ZonelI
HeatReturnl
The difference between current limit and shutdown current
HeatT4Zone4I
Heating T4>-15°C current limit value
HeatT4Zone3I
Heating 14>T4�—>10°C current limit value
HeatT4Zone2I
Heating 9>T4�—>6°Ccurrent limit value
HeatT4Zone11
Heating 5>T4°Ccurrent limit value
HeatStopl
Heating stop protection current
Figure 24
For Max Performance 36K and 48K, and Regular 48K Systems:
T4/°C
HeatT4Zone4I
15
14
HeatT4Zone3I
10
9
HeatT4Zone2I
6
5
HeatT4Zone 1I
-4
-5
HeatT4Zone0I
-9
-10
HeatT4Zone-1I
HeatReturnl
The difference between current limit and shutdown current
HeatT4Zone4I
Heating T4> 15°C current limit value
HeatT4Zone3I
Heating 14°C>T4>-10°C current limit value
HeatT4Zone2I
Heating 9°C>T4—>6°C current limit value
HeatT4Zone11
Heating 5°C>T4°Ccurrent limit value
HeatT4Zone01
Heating-5°C>T4>_-9°Ccurrent limit value
HeatT4Zone-11
Heating-10°C>T4 current limit value
HeatStopl
Heating stop protection current value
Figure 25
7.3.7 Indoor/ Outdoor Units Communication Protection
If the indoor units do not receive the feedback signal from the outdoor units for 2
consecutive minutes, the unit stops. The unit displays the failure code.
7.3.8 High Condenser Coil Temp. Protection
Figure 26
T3
Off
Decrease
Hold
Resume
Service Manual
® BOSCH
7.3.9 Outdoor Unit Anti -Freezing Protection 7.4 Control and Functions
When T2<4°C for 250seconds or T2<0°C, the indoor unit capacity demand is zero 7.4.1 Capacity Request Calculation
and resumes normal operation when T2>8°C and the protection time is no less than
3 minutes. Total capacity Request=E(Norm code x HP) /40xmodify rate+correction
7.3.10 Oil Return
Rules for Operation:
1. If the compressor frequency continues to be lower than the frequency set
for setting time, the unit raises the frequency to the frequency set for setting
time and then resumes with the former frequency.
2. The EXV continues at 300p while indoor units maintain their operation.
If the outdoor ambient temperature is higher than the set frequency during oil
return, the unit stops the oil return process.
7.2.11 Low Outdoor Ambient Temperature Protection
► When the compressor is off and T4 is lower than - 35°C for 10 seconds,
the unit stops and displays "LP" or "PCOL"
► When the compressor is on and T4 remains lower than -40°C for 10
seconds, the unit stops and displays "LP" or "PCOL"
► When T4 is no lower than -32°C for 10 seconds, the unit exits protection.
Cooling Mode:
T1-Ts
a 4
3 b 3
2 c 2
1 d 1
0 e 0
-1 f
Capacity area a b c d e f
Norm code (N) 3 2 1.5 1 0.5 0
Figure 27
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Table 14
1 The final result is an integer.
Use the following table and final capacity request to confirm the operating
frequency.
C00 C00 I C00 C00
Frequency (Hz) 0 L F1 L F2 --- LF2 L_F2
4 5
Amendatory 0 1 1 24 I 25
capacity demand. ---
Table 15
(6i BOSCH
Service Manual
The maximum running frequency is adjusted according to the outdoor ambient
temperature.
V
55
54
Fn x=
T4FREMAXCO
51.5
50.5
Fm =
T4FREMAXCI
45.5
44.5
Finaa=
T4FREMAXC2
39
38
4FREMAXC3
33
32
=
30
29
=
4FREMAXC5
22
20
Finax=
T FREMAXC6
10
8
Finax=
T4 REMAXC7
0
-2
Finax=
T4 EMAXC8
-1
-12
Finax=
T4F�MAXC9
Finax=
T4FR MAXC10
Figure 28
Heating Mode:
T1 Ts
4
3
f
3
2
e
2
1
d
1
0
0
b
-1
a
Capacity area
a
b
c
d
e
f
Norm code (N)
3
2
1.5
1
0.5
0
Figure 29
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Table 16
PC
The final result is an integer.
Then modify it according to a T2 average (correction):
°C T2 average
Decrease frequency
47
Keep frequency
40 Increase frequency
Figure 30
Use the following table and final capacity request to confirm the operating
frequency.
Frequency (Hz) 0 HEAT_ HEAT_ --- HEAT_ HEAT_
F1 I F2 --- F24 F25
Amendatory O 1 2 24 25
capacity demand. ---
Table 17
The maximum running frequency is adjusted according to the outdoor ambient
temperature.
21
Finax=T4FREHEATMAX3
19
18
� F-ax
TM —T4FRFHFAAX4
17
16
---- Finax=T4FREHEATMAX5
15
14
Finax—T4FREHEATMAX6
12
11
Finax=T4FREHEATMAX7------------------
6
5
— Finax—T4FREHEATMAX8
1
0
— Finax—T4FREHEATMAX9
—3
—4
Finax=F21
—7
—8
Finax—F22
—11
—12
Finax—F23
—15
—16
Finax=F24
Finax=F25
Figure 31
Service Manual
(W BOSCH
7.4.2 Defrost Control
Conditions for Defrosting:
After the compressor starts and enters normal operation, mark the minimum value
of T3 from the loth to 15th minute as T30.
If any one of the following conditions is satisfied, the unit enters defrost mode:
1. If the compressor's cumulative running time reaches 29 minutes and T3 <
TCDI1 and T3 + T30SUBT30NE <_ T30.
2. If the compressor cumulative running time reaches 35 minutes and T3 <
TCDI2 and T3 + T30SUBT3TWO <_ T30.
3. If the compressor cumulative running time reaches 40 minutes and T3 <
-24°C for 3 minutes.
4. If the compressor cumulative running time reaches 120 minutes and T3 <
-15°C.
5. If the air conditioner is shut down from heating mode, it will enter defrost
if any of the following conditions are met (this condition can be shielded by
parameters):
a. The continuous operation time of the press exceeds 30 minutes, and
T3<-7 degrees;
b. The continuous operation time of the press is more than 30 minutes, and
T30<-15 degrees;
6. For the first defrosting when the machine is turned on, after the compressor
has been running for 30 minutes, when T4-T3> (0.5T4 + KDELTT ADD)
and T3 <TCDIN5_ADD, it will immediately enter the defrosting action. After
performing this defrosting action once, this rule will be invalid until the next
restarting operation.
7. If any one of the following conditions is satisfied, the unit enters defrosting
mode,
a. If T3 or T4 is lower than -3°C for 30 seconds,Ts-T1 is lower than 5°C and
compressor running time is more than DEFROST_COND6_IN_TIM.
b. If T3 or T4 is lower than -3°C for 30 seconds and compressor running
time is more than DEFROST COND6 IN TIM +30.
Defrost Stop Conditions
If any one of the following conditions is satisfied, defrost mode ends and the unit
returns to normal heating mode:
► T3 rises above than TCDE1°C.
► T3 remains at TCDE2°C or above for 80 seconds.
► The machine runs for 10 consecutive minutes in defrost mode
Defrosting Action:
4-way valve
defrosting
Defrosting over
off
on
compressor
MaxlOminutes
frequency
Cool-F9
frequency
LCompressor sto s
Indoor fan IQSi 305
imeA IOS
Anti -cold control
off
Outdoor fan
off
EXV open
480P
48OPfor240s
Figure 32
7.4.3 Outdoor Fan Control
7.4.3.1 Cooling Mode
Under normal operating conditions, the system chooses the running fan speed
according to the ambient temperature:
BOSCH
Service Manual
When low ambient cooling is in effect:
► Outdoor fan speed control logic (low ambient cooling)
► When T4 < 15 °C (59 °F) and T3 < 30 °C (86 fl, the unit enters into low
ambient cooling mode. The outdoor fan chooses a speed according to T3.
► When T3>_38 °C (100.4 °F) or when T4>_ 15 °C (59 fl, the outdoor fan
chooses a speed according to T4 again.
T3
rLo,
38
30
27
23
off
Figure 34
T3
Inca ase fan speed increase
LowCoolT3_ON
K ep current fan\sped
LowCoolT3_Down
ecrease fan speed
LowCooIT3 OFF
Fan stop
Figure 35
7.4.3.2 Heating Mode
Under normal operating conditions, the system chooses a running fan speed
according to ambient temperature:
Outdoor temperature °C
21
19 \
18
16 \
15
13 \
12
10
0
—2 \
Figure 36
Brqeze fan speed
Super low fan speed
Low fan speed
Middle fan speed
High fan sped
Super high fan 1 peed
7.4.4 Electronic Expansion Valve (EXV)
For Max Performance 48K System:
1. After the outdoor unit is powered on again, the EXV is first closed -520P,
and then in standby mode (if the current mode is heating mode, the initial
heating degree is run, otherwise the initial cooling degree is run, and the
internal machine is not connected. deal with 7k unit). The main valve first
opens 51OP, then opens 530P, and then is in the standby state (if the current
outdoor mode is the heating mode or the standby mode, it maintains OP, and
the cooling mode opens to the initial cooling opening). The EVI valve opens
510P first, then 530P, then the counter is cleared to OP.
2. After the compressor is stopped,
a. If the EVI valve has a valve opening action before the stop, the PMV
CLOSE_EE step is closed in the reverse direction after the stop, and
then the EXV opening counter is cleared to OP. If the EVI valve does not
operate before the stop, OP will be maintained.
b. Reverse the valve to close the PMV CLOSE_EE step (after closing the
valve to the OP, and then continue to run PMV CLOSE_EE in the valve
closing direction, the EXV opening counter is cleared. If the current
opening is 300P, go to the valve Run the 320P in the closing direction to
close the EXV.), then in the standby state (if the current outdoor mode is
the heating mode, the initial heating opening is run, otherwise the initial
cooling opening is run, and the internal machine is not connected. deal
with 7k unit).
c. Main EXV action: When the compressor is off, the main EXV keeps
the opening degree when the compressor is turned off within the first
90 seconds. If it is currently heating mode, -20P, clear and keep OP,
otherwise adjust to 480P.
4. Other EXV(except for EVI valve) cannot be operated at the same time. The
action priorityorder is A-B-C-D-E-main valve. The EVI valve can be operated
together with other EXV.
Service Manual
® BOSCH
For other models,
Control:
1. EXV remains fully closed while the device is powering up. EXV then remains
on standby with 350P open. It opens to the target angle after the compressor
starts.
2. EXV closes with -40P when the compressor stops. Then it remains on
standby with 350P open. It opens to the target angle after the compressor
starts.
3. The action priority for the EXVs is A-B-C-D-E.
4. The compressor and outdoor fan commence operation only after EXV
initializes.
7.4.4.1 Cooling Mode
The initial open angle of the EXV depends on the size of the indoor model. The
adjustment range is 100-400p.
When the unit has been running for 3 minutes, the outdoor receives indoor units'
capacity demand and T213 information and then calculates their average. After
comparing each indoor's T213 with the average, the outdoor gives the following
modification commands:
► If T213 > average, the relevant valve needs to open 16P more
► If T26 = average, the relevant valve's open range remains as is
► If T26 < average, the relevant valve needs to close 16P more
This modification is carried out every 2 minutes.
7.4.4.2 Heating Mode
The initial open angle of the EXV depends on the size of the indoor model. The
adjustment range is 150 pulse - 350 pulse.
When the unit has been running for 3 minutes, the outdoor unit receives the indoor
units capacity demand and T2 information and then calculates their average.
After comparing each indoor unit's T2 with the average, the outdoor gives the
following modification commands:
► If T2 > average +2, the relevant valve needs to close 16P more
► If average+2 >_ T2 >_ average -2, relevant valve's open range remains as is
► If T2 < average -2, the relevant valve needs to open 16P more
This modification is carried out every 2 minutes.
7.4.5 Four•Way Valve Control
In heating mode, the four-way valve is opened.
In defrost mode, the four-way valve operates according to the current defrosting
action.
In other modes, the four-way valve is closed.
When the unit is switched from heating to other modes, the four-way valve turns off
after the compressor has been off for 2 consecutive minutes.
Failure or protection (excluding discharge temperature protection and high/low
pressure protection) causes the four-way valve to immediately shut down.
7.4.6 Outdoor Unit Digital Display
A digital display is featured on the outdoor PCB. The LED displays different codes in
the following situations:
► Standby: "- "
► Compressor operation: the running frequency.
► Defrosting mode: "dF" or alternative displays between running frequency
and "dF" (ach appears for 0.5s.)
► Forced cooling mode: the LED displays "FC" or alternative displays
between running frequency and "FC" (each appears for 0.5s).
► Compressor pre -heating: "PH" or alternative displays between running
frequency and "PH" (each appears for 0.5s.)
► Oil return process: "RO" or alternative displays between running frequency
and "RO" (each appears for 0.5s.)
► Low ambient cooling mode: "LC" or alternative displays between running
frequency and "LC" (each appears for 0.5s.)
► PFC module protection occurs three times within 15 minutes: "E6" or
alternates between displays of running frequency and 16" (each appears
for 0.5s.)
► In protection or malfunction, the LED displays an error code or protection
code. "PH", "RO", "LC", 16" are not suitable for 18-36K regular systems
and 18-27 hyper heat systems.
(6i BOSCH
Service Manual
7.4.7 Point check function (engineering troubleshooting mode)
A check switch is included on the outdoor PCB. Push SWl to check the unit's status
while running. The digital display shows the following codes each time the SW1 is
pushed.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Table 18
Normal display
Quantity of indoor units with working connection
Outdoor unit running mode code
Indoor unit A capacity
Indoor unit B capacity
Indoor unit C capacity
Indoor unit D capacity
Indoor unit E capacity
Indoor unit A capacity demand code
Indoor unit B capacity demand code
Indoor unit C capacity demand code
Indoor unit D capacity demand code
Indoor unit E capacity demand code
Outdoor unit amendatory capacity demand code
The frequency corresponding to the total indoor units'
amendatory capacity demand
The frequency after the frequency limit
The frequency sending to compressor control chip
Indoor unit A evaporator outlet temperature (T 2B A)
Indoor unit A evaporator outlet temperature (T-2 B B)
Indoor unit A evaporator outlet temperature (T-2B C)
Indoor unit Aevaporator outlet temperature (T 26D)
Indoor unit A evaporator outlet temperature (T-2B E)
Indoor unit room temperature (T1A)
Indoor unit room temperature (T113)
Indoor unit room temperature (T1C)
Indoor unit A room temperature (T1D)
Indoor unit room temperature (T1E)
Indoor unit A evaporator temperature (T2A)
Indoor unit A evaporator temperature (T2B)
Indoor unit A evaporator temperature (T2C)
Indoor unit evaporator temperature (T2D)
Indoor unit A evaporator temperature (T2E)
Condenser pipe temperature (T3)
Outdoor ambient temperature (T4)
Displays running frequency, running state, or malfunction code
Off: O,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost:A
The capacity unit is horse power. If the indoor unit is not connected, the digital
display shows the following: "—"(9K:1HP,12K:1.2HP,18K:1.5HP,24K:2.0HP)
Norm code"HP (9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.OHP)
If the temperature is lower than -9 °C, the digital display shows "-9." If the
temperature is higher than 70 °C, the digital display shows "70." If the
indoor unit is not connected, the digital display shows:
If the temperature is lower than 0 °C, the digital display shows "0." If the
temperature is higher than 50 °C, the digital display shows "50." If the
indoor unit is not connected, the digital display shows:
If the temperature is lower than -9 °C, the digital display shows "-9." If the
temperature is higher than 70 °C, the digital display shows 70." If the indoor unit
is not connected, the digital display shows: "—"
I
The display value is between 30-129 °C. If the temperature is lower than 30'C,
Compressor discharge temperature (TP) the digital display shows "30." If the temperature is higher than 99 °C, the digital
display shows single and double digits. For example, if the digital display shows
"0.5", the compressor discharge temperature is 105 °C.
AD value of current The display value is a hex number. For example, the digital display
AD value of voltage tube shows Tcl", it means AD value is 205.
Service Manual ) BOSCH
37
EXV open angle for A indoor unit
38
EXV open angle for B indoor unit
Actual data/4. If the value is higher than 99, the digital display shows
39
EXV open angle for C indoor unit
single and double digits. For example, if the digital display
40
EXV open angle for D indoor unit
shows "2.0", the EXV open angle is 120=4=480p.
41
EXV open angle for E indoor unit
Bit7 Frequency limit caused by IGBT radiator
The display value is a
Bit6 Frequency limit caused by PFC hexidecimal number. For
Bit5 Frequency limit caused byT4 example, the digital display
Bit4 Frequency limit caused by T2 show 2A, then Bit5=1,
42
Frequency limit symbol
Bit3=1, and Bitl=1.
13it3 Frequency limit caused byT3 This means that a frequency
13it2 Frequency limit caused byT5 limit may be caused
Bitl Frequency limit caused by current byT4, T3, or the current.
BitO Frequency limit caused by voltage
43
Average value of T2
(Sum T2 value of all indoor units)/(number of indoor units in good connection)
44
Outdoor unit fan motor state
Off: 0, Super high speed:l, High speed:2, Med speed: 3,
Low speed: 4, Breeze:5, Super breeze: 6
45
The last error or protection code
00 means no malfunction and protection
46
F indoor unit capacity
47
F indoor unit capacity demand code
48
F indoor unit evaporator outlet temperature (T 213 F)
49
F indoor unit room temperature (T 1 F)
50
F indoor unit evaporator temperature (T_2 F)
51
EXV open angle for F indoor unit
52
Reason of stop
53
EVI valve target angle(only for 48K Hyper Heat System)
Actual data/4. If the value is higher than 99, the digital display tube
54
EVI valve open angle(only for 48K Hyper Heat System)
will show single digit and tens digit. For example, the digital display
55
EVI valve angle(only for 48K Hyper Heat System)
tube show "2.0",it means the EXV open angle is 120X4=480p.)
Table 19
BOSCH
Service Manual
For 18K Regular System:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28 '
29
30
31
33
34
35
36
37
Table 20
I
Normal display
Quantity of indoor units with working connection
Outdoor unit running mode code
Indoor unit capacity
Indoor unit B capacity
Indoor unit C capacity
Indoor unit D capacity
Indoor unit E capacity
Indoor unit A capacity demand code
Indoor unit B capacity demand code
Indoor unit C capacity demand code
Indoor unit D capacity demand code
Indoor unit E capacity demand code
Outdoor unit amendatory capacity demand code
The frequency corresponding to the total indoor units'
amendatory capacity demand
The frequency after the frequency limit
The frequency sending to compressor control chip
Indoor unit A evaporator outlet temperature (T-26 A)
Indoor unit A evaporator outlet temperature (T-2 B B)
Indoor unit A evaporator outlet temperature (T-26 C)
Indoor unit A evaporator outlet temperature (T-26 D)
Indoor unit A evaporator outlet temperature (T-21B E)
Indoor unit A room temperature (T1A)
Indoor unit room temperature (T1B)
Indoor unit room temperature (TIC)
Indoor unit A room temperature (TID)
Indoor unit room temperature (TIE)
Indoor unit evaporator temperature (T2A)
Indoor unit A evaporator temperature (T2B)
Indoor unit A evaporator temperature (T2C)
Indoor unit evaporator temperature (T2D)
Indoor unit A evaporator temperature (T2E)
Condenser pipe temperature (T3)
Outdoor ambient temperature (T4)
Compressor discharge temperature (TP)
AD value of current
AD value of AC voltage
AD value of DC voltage
Displays running frequency, running state, or malfunction code
Off: 0,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost:A
The capacity unit is horse power. If the indoor unit is not connected, the digital
display shows the following: "—"(91K:iHP,12K:1.2HP,18K:1.5HP,24K:2.0HP)
Norm code"HP (9K: IHP,12K: 1.2HP,18K: 1.5HP,24K:2.0HP)
If the temperature is lower than -9 °C, the digital display shows "-9." If the
temperature is higher than 70 °C, the digital display shows "70." If the
indoor unit is not connected, the digital display shows:
If the temperature is lower than 0 °C, the digital display shows "0." If the
temperature is higher than 50 °C, the digital display shows "50." If the
indoor unit is not connected, the digital display shows:
If the temperature is lower than -9 °C, the digital display shows "-9." If the
temperature is higher than 70 °C, the digital display shows 70." If the indoor unit
is not connected, the digital display shows: "—'
The display value is between 30-129 °C. If the temperature is lower than 30'C,
the digital display shows "30." If the temperature is higher than 99 °C, the digital
display shows single and double digits. For example, if the digital display shows
"0.5", the compressor discharge temperature is 105 °C.
The display value is a hex number. For example, the digital display
tube shows "Cd", it means AD value is 205.
Service Manual
BOSCH
38 EXV open angle for A indoor unit
39 EXV open angle for B indoor unit
40 EXV open angle for C indoor unit
41 EXV open angle for D indoor unit
42 EXV open angle for E indoor unit
43 MVI valve open angle
44 EVI valve open angle
45 1 Frequency limit symbol
46 1 T213 fault
47 Average value of T2
Actual data/4. If the value is higher than 99,
single and double digits. For example,
shows "2.0", the EXV open angle i,,
Bit7
Reserve
Bit6
Frequency limit caused by voltage
Bit5
Frequency limit caused by current
Bit4
Reserve
Bit3
Frequency limit caused by IPM
Bit2
Frequency limit caused byT5
Bitl
Frequency limit caused byT3
BitO
Frequency limit caused by T2
"OO:No
fault,01:T2B-A fault, ,02:T2B-B fault ,0;
05:T2B-E fault, 06:T2B-F fault(The display
(Sum T2 v
ennd rnnn
the digital display shows
f the digital display
120=4=480p.
The display value
is a hexidecimal number.
For example, the digital
display show 2A, then Bit5=1,
Bit3=1, and Bitl=1. This
means that a frequency limit
may be caused by IPM, T3,
or the current.
:T213-C fault,04:T2B-D fault,
priority is A-B-C-D-E-F)"
alue of all indoor units)/(number of indoor units in
ection)( The heating is the average value of T2, and
the cooling is the average value of T2B)
48 Outdoor unit fan motor state Off: 0, Super ultra high speed:1, Super high speed:2, High speed:3,
Med speed: 4, Low speed: 5, Breeze:6, Super breeze: 7
49 Reason of stop
(�J BOSCH
Service Manual
8 Troubleshooting
Safety
A
WARNING: ELECTRICAL HAZARD
► Electricity power is still kept in capacitors even though
power supply is shut off. Do not forget to discharge the
electricity in capacitor.
Figure 37
The value of resistance is between 15000 to 20001).
The voltage in P3 and P4 in outdoor PCB is approximately 310V.
The voltage in P5 and P6 in outdoor PCB is approximately 310V.
Service Manual
BOSCH
8.1 Multi Zone Outdoor Unit Error Codes
NOTICE
► If below error codes appear, please turn off the system and
contact an Authorized Service Provider.
EC 51 Outdoor EEPROM malfunction
EL O1 Indoor / outdoor units communication error
PC 40 Communication malfunction between IPM board and outdoor main board
PC 08 Outdoor overcurrent protection
PC 10 Outdoor unit low AC voltage protection
PC 11 Outdoor unit main control board DC bus high voltage protection
PC 12 Outdoor unit main control board DC bus high voltage protection /341 MCE error
PC 00 IPM module protection
PC OF PFC module protection
EC 71 Over current failure of outdoor DC fan motor
EC 72 Lack phase failure of outdoor DC fan motor
EC 07 Outdoor fan speed has been out of control
PC 43 Outdoor compressor lack phase protection
PC 44 Outdoor unit zero speed protection
PC 45 Outdoor unit IR chip drive failure
PC 46 Compressor speed has been out of control
PC49 Compressor overcurrent failure
PC 30 High pressure protection (For M4OB-36HFN8-0, M50D-42HFN8-Q, M50E-42HFN8-Q)
PC 31 Low pressure protection (For M4OB-36HFN8-0, M50D-42HFN8-Q, M50E-42HFN8-Q)
PC OA High temperature protection of condenser
PC 06 Temperature protection of compressor discharge
PC OL Low ambient temperature protection
PC 02 Top temperature protection of compressor
EC 52 Condenser coil temperature sensor T3 is in open circuit or has short circuited
EC 53 Outdoor room temperature sensor T4 is in open circuit or has short circuited
EC 54 Compressor discharge temperature sensor TP is in open circuit or has short circuited
EC 56 Evaporator coil outlet temperature sensor T213 is in open circuit or has short circuited
EC50 Open orshort circuit of outdoor unittemperature sensor(T3,T4.T5)
Table 21
1 For Indoor Error Codes, please refer to the indoor service manual.
BOSCH
Service Manual
8.2 Quick Check by Error Codes
IDU PCB
ODU PCB
Display Board
IDU Fan Motor
ODU Fan Motor
Ti Sensor
T2 Sensor
T26 Sensor
T3 Sensor
T4 Sensor
T5 Sensor
Water Level Switch
Condensate Pump
Reactor
Compressor
IPM Board
Over Load Protector
PFC Module
PFC Module Inductance
Bridge Rectifier
Wiring Mistake
Refrigerant Charge / Leak
System Block
Power Sunnlv
Table 22
Service Manual
OW BOSCH
8.3 ODU PCB & IPM
8.3.1 PCB: Multi Zone Regular 18K BMS500•AAM018.1CSXRC
Figure 38
CN11
Lin: connect to Wine (208-230VAC input)
1
Power Supply
CN12
N_in: connect to Hine (208-230VAC input)
CN4
connect to Electric Expansion Valve A
Electronic Expansion
CN2
connect to Electric Expansion Valve B
2
valve
CN34
connect to Electric Expansion Valve C
CN5
connect to Electric Expansion Valve D
S-A
CN10
CN13
S-B
3
S: connect to indoor unit communication(pinl-pin2: 24VDC Pulse wave; pin2-pin3: 208-230V AC input)
CN3
S-C
S-D
CN15
4 HEAT_D
CN21/CN36
connect to chassis heater, 208-230V AC when is ON
5 4-way
CN38
connect to 4 way valve, 208-230V AC when is ON.
6 HEAT_Y
CN8/CN20
connect to compressor heater, 208-230V AC when is ON
7 T21B
CN28
connect to evaporator coil outlet temperature sensor T2B
8 T3 T4 TP
CN26
connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust temp. sensor TP
9 OLP TEMP. SENSOR
CN30
connect to compressor top temp. sensor (5VDC Pulse wave)
10 H-PRO,L-RPO
CN29
connect to high and low pressure swtich(pin1-pin2&pin3-pin4:5VDC pulse wave)
i 11 TESTPORT
CN24
used for testing
12 /
CN27
connect to keyboard CN1
Figure 39
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Service Manual
0 BOSCH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
T3/T4
CN17
T3: condenser temperature sensor T4: outdoor ambient temperature sensor
CN7
CN7
connect to discharge sensor
TESTPORT
CN26
connect to DR board CN 1
LOW/HIGH
CN14
Red: low pressure protect Yellow: high pressure protect
Comp Top
CN12
compressor top temperature sensor
L-OUT
L-OUT
connect to IPM board CN4
N-OUT
N-OUT
connect to IPM board CN5
CN32
CN32
connect to DR board CN5
CN33
CN33
connect to DR board CN5
N-in
CN4
N_in: connect to N-line (208-230VAC input)
HEAT2
CN8/CN9
connect to chassis heater, 208-230V AC when is ON
L-in
CN3
Lin: connect to L-line (208-230V AC input)
HEAT1
CN5/CN6
connect to compressor heater, 208-230V AC when is ON
4-way
CN 1/CN2
connect to 4 way valve, 208-230V AC when is ON.
Fan-C
CN13
connect to fan capacitor
Outdoor AC Fan
CN 11
connect to outdoor AC fan
Fan-C
CN10
connect to fan capacitor
CN 18
connect to Electric Expansion Valve A
Electronic Expansion
CN19
connect to Electric Expansion Valve B
valve
CN22
connect to Electric Expansion Valve C
CN24
connect to Electric Expansion Valve D
S-A
CN25
Current loop communication A, signal wire, connect to the terminal (24V DC Pulse wave)
S-B
CN23
Current loop communication B, signal wire, connect to the terminal (24V DC Pulse wave)
S-C
CN20
Current loop communication C, signal wire, connect to the terminal (24V DC Pulse wave)
S-D
CN16
Current loop communication D, signal wire, connect to the terminal (24V DC Pulse wave)
Table 23
BOSCH
Service Manual
8.3.3 IPM: Multi Zone Regular 27K, 36K & Max Performance 18K, 27K
BMS500-AAM027.1CSXRC, BMS500-AAM036.1CSXRC,
BMS500-AAM018.1CSXHC, BMS500-AAM027-1CSXHC
17122000018251 L CN11
U
0 + 0 o Qom'
0
1
CAUTION HIGH VOLTAGE C3 ZR3ZR2 PT PT01
° L&N_IN ® +
CN
BR1 Reactor
z o o ° a
❑ !
o000 0 0 T
° o o
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CN6 �z p-«. o 3$
aml�e wne.q •� - �j •� 4 �F
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Figure 41
CN4
CN4
connect to main board L-Out
1
CN5
CN5
connect to main board N-Out
2
CN_Reactor
CN2/CN3
connect to reactor
3
CN_COMP
CN_COMP
connect to compressor
L4
CN1
CN1
connect to main board CN21
5
AN DC
CN 14
connect to outdoor DC fan
Table 24
Service Manual
8.3.4 PCB: Multi Zone Regular 48K & Max Performance 36K, 48K
BMS500-AAM048.1CSXRC, BMS500-AAM036.1CSXHC, BMS500-AAM048-
1CSXHC
ro. 01�j Mail
cn U
000
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Figure 42
3 ;� � D
PJ9
TH
0 BOSCH
1
)
D
D
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C
8)
BOSCH
Service Manual
AM
1 Power Si
2 TP
3 TESTP(
4 HEAT
5 HEAT
6 4-WA
7 AC-FAI
8 AC-FAI
9 H-PRO,L
10 OLPTEMP.;
11 T2B
12 T3 T,
13 Electronic E)
valvE
14 /
15 POE
Table 25
CN#
CN1
Meaning
Ll_in: connectto Li -line (230VAC input)
pply
CN3
1-2_in: connectto 1-2-line (230VAC input)
CN8
Exhaust temp. sensor TP
RT
CN35
used for testing
L
CN19/CN20
connect to chassis heater, 208-230V AC when is ON
2
CN24/CN25
connect to compressor heater, 208-230V AC when is ON
I
CN17/ CN18
connect to 4 way valve, 208-230V AC when is ON.
12
CN28/CN31/CN36
connect to ACfan2
11
CN27/ CN32/ CN34
connect to AC fan
RPO
CN10
connect to high and low pressure swtich(pins-pint&pin3-pin4:5VDCpulse wave)
ENSOR
CN14
connect to compressor top temp. sensor (SVDC Pulse wave)
CN 11
connect to pipe temp. sensor T213
CN9
connect to pipe temp. sensor T3, ambient temp. sensor T4
CN 15
connect to Electric Expansion Valve A
CN23
connect to Electric Expansion Valve B
pansion
CN26
connect to Electric Expansion Valve C
CN30
connect to Electric Expansion Valve D
CN33
connect to Electric Expansion Valve E
CN38
connect to Electric Expansion Valve F
CN6
connect to IPM&PFC board CN9
CN22
485 communication
Service Manual
® BOSCH
8.3.5 IPM: Multi Zone Regular 48K & Max Performance 36K, 48K
BMS500-AAM048-1CSXRC, BMS500-AAM036.1CSXHC, BMS500-AAM048-
1CSXHC
Figure 43
1
Power Supply
2
/
3
FAN —DC
HEAT1
4
HEAT2
4-WAY
Table 26
CN3
CN2
CN9
FAN-1/FAN-2
U1
V1
W1
connect to main board L-Out
connect to main board N-Out
Connect to main PCB CN6
connect to outdoor DC fan 1& DC fan 2
Connect to compressor
BOSCH
Service Manual
8.4 Outdoor Unit Display
8.4.1 Outdoor Unit Point Check Function
A check switch is included on the outdoor PCB. Push SWl to check the unit's status
while running. The digital display shows the following codes each time the SW1 is
pushed. See Tables 17 & 18.
0 1 Normal display
1 I Quantity of indoor units with working connection
2
Outdoor unit running mode code
3
Indoor unit capacity
4
Indoor unit B capacity
5
Indoor unit C capacity
6
Indoor unit D capacity
7
Indoor unit E capacity
8
Indoor unit capacity demand code
9
Indoor unit B capacity demand code
10
Indoor unit C capacity demand code
11
Indoor unit D capacity demand code
12
Indoor unit E capacity demand code
13
Outdoor unit amendatory capacity demand code
14
The frequency corresponding to the total indoor units'
amendatory capacity demand
15
The frequency after the frequency limit
16
The frequency sent to compressor control chip
17
Indoor unit A evaporator outlet temperature (T2BA)
18
Indoor unit B evaporator outlet temperature (T2BB)
19
Indoor unit C evaporator outlet temperature (T2BC)
20
Indoor unit D evaporator outlet temperature (T2BD)
21
Indoor unit E evaporator outlet temperature (T2BE)
Table 27
figure 44
Displays running frequency, running state, or malfunction code
Actual data
Display
Number of indoor unit
1
1
2
2
3
3
4
4
5
5
Off: 0, Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced Defrost: A
Current capacity/horse power
If the indoor unit is not connected,
the digital display shows the following:
(9K:1HP,12K:1.2HP,18K:1.5HP,24K:2.0HP)
Norm code*HP
(9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.0HP)
If the temperature is lower than -9 °C, the digital display shows "-9."
If the temperature is higher than 70 °C, the digital display shows " 70:'
If the indoor unit is not connected, the digital display shows: "—"
Service Manual
0 BOSCH
22
23
24
25
26
27
28
29
30
31
32
33
Indoor unit A room temperature (T1A)
Indoor unit B room temperature (TiB)
Indoor unit C room temperature (TiQ
Indoor unit D room temperature (T1D)
Indoor unit E room temperature (T1E)
Indoor unit A evaporator temperature (T2A)
Indoor unit B evaporator temperature (T213)
Indoor unit C evaporator temperature (T2C)
Indoor unit D evaporator temperature (T2D)
Indoor unit E evaporator temperature (T2E)
Condenser pipe temperature (T3)
Outdoor ambient temperature (T4)
34 Compressor discharge temperature(TP)
35 AD value of current
36 AD value of voltage
37 EXV open angle for A indoor unit
38 EXV open angle for B indoor unit
39 EXV open angle for C indoor unit
40 EXV open angle for D indoor unit
41 EXV open angle for E indoor unit
42 Frequency limit symbol
43
Average value of T2
44
Outdoor unit fan motor state
45
The last error or protection code
46
F indoor unit capacity
47
F indoor unit capacity demand code
48
F indoor unit evaporator outlet temperature (T2BF) m
49
F indoor unit room temperature (T1F)
50
F indoor unit evaporator temperature (T2F)
51
EXV open angle for F indoor unit
52
Reason of stop
53
EVI valve target angle(only for M50G-48HFN1-M-[X])
EVI valve open angle(only for M5OG- 48HFN1-M-[X])
55
EVI valve angle(only for M50G-48HFN 1-M- [X])
If the temperature is lower than 0 °C, the digital display shows "0."
If the temperature is higher than 50 °C, the digital display shows "50."
If the indoor unit is not connected, the digital display shows:
If the temperature is lower than -9 °C, the digital display shows "-9."
If the temperature is higher than 70 °C, the digital display shows "70."
If the indoor unit is not connected, the digital display shows: ="
The display value is between 30-129 °C.
If the temperature is lower than 30 °C, the digital display shows "30."
If the temperature is higher than 99 °C, the display will show a decimal point. For
example, if the digital display shows "0.5",
the compressor discharge temperature is 105'C.
The display value is a hex number. For example, the digital
display tube shows "Cd", it means AD value is 205.
The display value is a hex number. For example, the digital
display tube shows "Cd", it means AD value is 205.
Actual data/4.
If the value is higher than 99, the digital display will show a decimal point.
For example, if the digital display shows "2.0",
the EXV open angle is 120=4=480 pulse.
Bit7
Frequency limit caused by IGBT radiator
The display value is a
Bit6
Frequency limit caused by PFC
hexidecimal number. For
Bit5
Frequency limit caused by T4.
example, the digital display
Bit4
Frequency limit caused by T2.
show 2A, then Bit5=1,
Bit3=1, and Bitl=1. This
Bit3
Frequency limit caused by T3.
means that
Bit2
Frequency limit caused byTS.
a frequency limit may be
Bitl
Frequency limit caused by current
caused by T4, T3, or the
BitO
Frequency limit caused by voltage
current.
(Sum T2 value of all indoor units)/(number of indoor units with good connection)
Off: 0, High speed:1, Med speed: 2, Low speed:
3, Breeze: 4, Super breeze: 5
00 means no malfunction and
protection
Actual data/4. If the value is higher than 99, the digital display tube will
show single digit and tens digit. For example, the digital display tube show
"2.0",it means the EXV open angle is 120X4=480p.)"
Table 28
BOSCH
Service Manual
For M2OA 18HFN1 M
r 6U, U YJ
a
Table 29
0 Normal display
1 1 Quantity of indoor units with working connection
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Outdoor unit running mode code
Indoor unitA capacity
Indoor unit B capacity
Indoor unit C capacity
Indoor unit D capacity
Indoor unit E capacity
Indoor unit A capacity demand code
Indoor unit B capacity demand code
Indoor unit C capacity demand code
Indoor unit D capacity demand code
Indoor unit E capacity demand code
Outdoor unit amendatory capacity demand code
The frequency corresponding to the total indoor units'
amendatory capacity demand
The frequency after the frequency limit
The frequency sent to compressor control chip
Indoor unit A evaporator outlet temperature (T2BA)
Indoor unit B evaporator outlet temperature (T2BB)
Indoor unit C evaporator outlet temperature (T2BC)
Indoor unit D evaporator outlet temperature (T2BD)
Indoor unit E evaporator outlet temperature (T2BE)
Displays running frequency, running state, or malfunction code
Actual data
Display
Number of indoor unit
1
1
2
2
3
3
4
4
5
5
Off: 0, Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced Defrost: A
Current capacity/horse power
If the indoor unit is not connected,
the digital display shows the following: -"
(9K:1HP,12K:1.2HP,18K:1.5HP,24K:2.OHP)
Norm code*HP
(9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.OHP)
If the temperature is lower than -9 °C, the digital display shows "-9."
If the temperature is higher than 70 °C, the digital display shows "70."
If the indoor unit is not connected, the digital display shows: "—'
Service Manual
0 BOSCH
22 Indoor unit A room temperature (T1A)
23 Indoor unit B room temperature (TiB)
24 Indoor unit C room temperature (TiQ
25 Indoor unit D room temperature (T1D)
26 Indoor unit E room temperature (T1E)
27 Indoor unit A evaporator temperature (T2A)
28 Indoor unit B evaporator temperature (T213)
29 Indoor unit C evaporator temperature (T2C)
30 Indoor unit D evaporator temperature (T2D)
31 Indoor unit E evaporator temperature (T2E)
32 Condenser pipe temperature (T3)
33 Outdoor ambient temperature (T4)
34 1 Compressor discharge temperature(TP)
35 AD value of current
36 AD value of AC voltage
37 AD value of DC voltage
38 EXV open angle for A indoor unit
39
EXV open angle for B indoor unit
40
EXV open angle for C indoor unit
41 EXV open angle for D indoor unit
42 EXV open angle for E indoor unit
43 MVI valve open angle
44 EVI valve open angle
45 Frequency limit symbol
T2B fault
47 1 Average value of T2
Outdoor unit fan motor state
49 1 Reason of stop
Table 30
If the temperature is lower than 0 °C, the digital display shows "0."
If the temperature is higher than 50 °C, the digital display shows "50 "
If the indoor unit is not connected, the digital display shows:
If the temperature is lower than -9 °C, the digital display shows "-9."
If the temperature is higher than 70 °C, the digital display shows "70."
If the indoor unit is not connected, the digital display shows: ="
The display value is between 30-129 °C.
If the temperature is lower than 30 °C, the digital display shows "30."
If the temperature is higher than 99 °C, the display will show a decimal point. For
example, if the digital display shows "0.5",
the compressor discharge temperature is 105'C.
The display value is a hex number. For example, the digital
display tube shows "Cd", it means AD value is 205.
Actual data/4.
If the value is higher than 99, the digital display will show a decimal point.
For example, if the digital display shows "2.0",
the EXV open angle is 120=4=480 pulse.
Bit7
Reserve
The display value is a
hexidecimal number. For
example, the digital display
show 2A, then Bit5=1,
Bit3=1, and Bitl=1. This
means that a frequency limit
may be caused by current,
IPM or T3.
Bit6
Frequency limit caused by voltage
Bit5
Frequency limit caused by current.
Bit4
Reserve.
Bit3
Frequency limit caused by IPM.
Bit2
Frequency limit caused byTS.
Bitl
Frequency limit caused by T3
BitO I Frequency limit caused by T2
OO:No fault,01:T2B-A fault, ,02:T26-13 fault ,03:T2B-C fault,04:T2B-D fault,
05:T26-E fault, 06:T26-F fault(The display priority is A-B-C-D-E-F)
(Sum T2 value of all indoor units)/(number of indoor units in good connection)(
The heating is the average value of T2, and the cooling is the
average value of T213)
Off: 0, Super ultra high speed: 1, Super high speed:2, High speed:3, Med
speed: 4, Low speed: 5, Breeze:6, Super breeze: 7
(% BOSCH
Service Manual
Outdoor Unit Digital Display
A digital display is featured on the outdoor PCB.
The LED displays different codes in the following situations:
► Standby: "- -."
► Compressor operation: the running frequency.
► Defrosting mode:'W" or alternative displays between running frequency
and "dF" (ach appears for 0.5s.)
► Forced cooling mode: the LED displays "FC" or alternative displays
between running frequency and "FC" (each appears for 0.5s).
► Compressor pre -heating: "PH" or alternative displays between running
frequency and "PH" (each appears for 0.5s.)
► Oil return process: "RO" or alternative displays between running frequency
and "RO" (each appears for 0.5s.)
► Low ambient cooling mode: "LC or alternative displays between running
frequency and 1C" (each appears for 0.5s.)
► PFC module protection occurs three times within 15 minutes: "E6" or
alternates between displays of running frequency and 16" (each appears
for 0.5s.)
► In protection or malfunction, the LED displays an error code or protection
code. "PH", "RO", "LC", 16" are not suitable for M20A-18HFN 1-M, M20I-
18HFN1-M, M30J-27HFN1-M, M301-28HFN1-M, M40G-36HFN1-M
Service Manual
0 BOSCH
8.5 Diagnosis and Solution
8.6.1 EEPROM parameter error (EC 51)
Error Code
Malfunction decision conditions
Outdoor PCB main chip does not receive feedback from EEPROM chip.
► Incorrect installation of indoor to outdoor control wire or line voltage wiring
Supposed causes ► PCB faulty
Table 31
Troubleshooting:
Power off, then restart the
unit 3 minutes later.
If error continues
Replace the outdoor
main PCB.
Figure 46
EEPROM: a read-only memory whose contents can be erased and reprogrammed
using a pulsed voltage. For the location of EEPROM chip, please refer to
the below photos.
Figure 47
11The photo above is for reference only, it may not be identical to the
—1 PCB shipped with your equipment.
BOSCH
Service Manual
8.6.2 Indoor/ outdoor communication error (EL 01)
Error Code
Malfunction decision conditions
Supposed causes A
Table 32
Troubleshooting:
EL 01
Indoor unit does not receive the feedback from outdoor unit for 120 seconds or outdoor unit does not
receive the feedback from any one indoor unit for 180 seconds.
► Incorrect installation of indoor to outdoor control wire
► Indoor or outdoor PCB faulty
Communication malfunction between indoor and
outdoor units
Start: Power off, then Power on the
A/C by the Breaker. (reconnect the
power wire). Is it still displaying the
error code?
Yes
heck wiring on the outdoor and indoo
terminal follow the wiring diagram. is all No—►
Reconnect the wiring
connecting correctly?
No
Reconnect the wiring
Yes
Measure Vs, is it moving
Turn on all indoor unit by remote
alternately between positive value
Is all the wiring between
controller. Is all indoor unit displa N
and negative value? (Vs is the
N terminal and Indoor PCB
voltage between Sand L2).
connect ok?
Refer to Figure 49
Yes
Yes
*—Yes
Yes
Change the Indoor PCB
urn off the all indoor units. Is IP
power LED or operating LED lamp N
change IPM
On? Refer to Figure 50
and Figure 51.
Power on by remote
controller, Its n still
Yes
displaying thee code
after 3 minuted
Is main board
15 the reactorconnecting
No
lamp on? Refer to
N
well?
Reconnect the wiring
Figure 52.
No
Yes
Yes
Change Outdoor Main PCB
s indoor units number correct? Check
on the outdoor check point . (2 for dual
Trouble is solved
,one , 3 for tri zone, 4 for qua zone).
Refer Figure 53.
No first time —No Second time
Change outdoor unit PCB assembly(include
wiring)totally
Figure 48
Service Manual
BOSCH
Note:
► Use a multimeter to test the DC voltage between 2 (old: L2) port and 3
port of outdoor unit. The red pin of multimeter connects with 2 (old: 1-2)
port while the black pin is for 3 port. When AC is normal running, the
voltage will move alternately between positive value and negative value.
IPM board (18K & 27K Models):
Figure 50
IPM board - Regular: 36K & 48K Models / Max Performance: 27K & 36K
Figure 52
Main Board LED
W 0
Power On Unit Standby
BOSCH
Service Manual
8.6.3 IPM board and outdoor main control board communication error (PC 40)
Error Code
Malfunction decision conditions
Supposed causes
Table 33
Troubleshooting:
Figure 54
PC 40
PCB main chip does not receive feedback from IPM module for 60 seconds.
► Improper/ Incorrect Wiring
► Outdoor PCB faulty
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
No
Check the signal wire between
the IPM module and the main
board, is it connected good?
Yes
Reconnect and retry. Is
error still display?
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor main
board, and then check
whether the system can run
normally
No
No
Replace the electric control
Trouble is solved
box
Service Manual
® BOSCH
Note:
Use a multimeter to test the DC voltage between black pin and white pin
of signal wire. The normal value should be around 5V.
Figure 55
► Use a multimeter to test the DC voltage between black pin and red pin of
signal wire. The normal value should be approximately 12V.
Figure 56
BOSCH
Service Manual
8.6.4 Outdoor temperature sensor (coil sensor T3,ambient sensor T4,
Compressor discharge sensor T5 indoor coil outlet pipe sensor T213)
malfunction) (EC 52/EC 53/EC 54/EC 56/EC 50)
M i
Error Code EC 52/EC 53/EC 54/EC 56/EC 50
Malfunction decision conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
► Improper/Incorrect Wiring
Supposed causes ► Sensor faulty
► Indoor/ Outdoor PCB faulty
Table 34
Troubleshooting:
Cthe
the connections
en temperature No Correct the connections
or and PCB.
nections correct?
Yes
Check the resistance value
,f the sensors via Appendix
and Appendix 2
Is it normaesP- Replace indoor or outdoor PCB.
I
Replace the sensor
Figure 57
► Outdoor room temperature sensor T4 is in open circuit or has short
circuited(EC 53)
► Compressor discharge temperature sensor T5 is in open circuit or has
short circuited(EC 54)
► Evaporator coil outlet temperature sensor T213 is in open circuit or has
short circuited(EC 56)
Service Manual
i BOSCH
8.6.5 Over -voltage or under -voltage protection (PC 10/PC it/PC 12)
Error Code
Malfunction decision conditions
Supposed causes
Table 35
Troubleshooting:
Figure 59
PC 10/PC 11/PC 12
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
► Power supply problems
► System problems, such as leakage or blockage
► Outdoor PCB faulty
Voltage protection
Check the voltage of
outdoor unit power; is
the voltage between
L(1-1)and N(L2)
between 187-264VAC
Yes
Check whether the voltage of IPM
board P and N(GND) is normal?
DC277-356V for 18K & 27K models
DC277-410V for for 36K & 48K models
N
Replace bridge rectifiers,
and then check whether the
system can run normally (for
48K model)*
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor PCB
Check the power supply
Yes Yes
Problem is solved
The bridge rectifier can be only
replaced on 48K model. On all
other models, ODU PCBs should
be replaced as the bridge rectifier
is embedded in PCBs
CO, BOSCH
Service Manual
IPM Board
(for 18K & 27K models)
IVE�—�
01
Figure 60
Figure 61
Bridge rectifier
(for 18K & 27K models)
Remark:
Measure the DC voltage
between + and - port. The
normal value should be between
190V-25OV.
P (or E1/E2/E3) -N (GND)
(for 18K & 27K models)
Service Manual
® BOSCH
Figure 62
CO, BOSCH
Service Manual
IPM Module
(for 48K model only)
Figure 63
B ridge rectifier
(for 48K model)
Remark:
Measure the DC voltage
between + and - port. The
normal value should be between
190V-25OV.
IPM board
(for 48K model)
Service Manual) BOSCH
8.6.6 PFC module protection error (PC OF)
Error Code PC OF
Malfunction decision conditions When the voltage signal that PFC sends to main control board is abnormal, the display LED will show
16" and AC will turn off.
► Improper/Incorrect Wiring
► Outdoor PCB faulty
Supposed causes ► PFC module inductance faulty
► PFC module faulty
Table 36
Troubleshooting:
PFC module protection
Check whether the
connecting line between
main board and the PFC No Connect it tightly, check
module (IPM module) is if connection is normal
connected tightly
Yes
Check whether the voltage
range of P-N on IPM
module is normal? DC277-—Yes —► Replace the outdoor main board Yes
356V for 18K & 2�361<
K models,
DC 277-41 OV for model
No
Check whether the
inductance of PFC module
is good? If the inductance is Now Replace the inductance
good, the resistance of the
two ports should be 0
Yes
Replace the PFC module (IPM P. Problem is solved
module)
Figure 64
CO, BOSCH
Service Manual
Figure 65
Figure 66
Service Manual
j BOSCH
8.6.7 Outdoor fan speed malfunction (EC 07) Over current failure of
outdoor DC fan motor (EC 71)
Error Code
Malfunction decision conditions
Supposed causes
Table 37
Troubleshooting:
Figure 67
EC 07/ EC 71
When outdoor fan speed keeps too low (300RPM) or too high(2400RPM) for certain time, the unit will
stop and the LED will display the failure.
► Improper/Incorrect Wiring
► Faulty Fan assembly
► Faulty Fan motor
► Outdoor PCB faulty
Power off, then restart the
unit 3 minutes later. Is it still //—No 10
\ displaying the error code?
Yes
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
Yes
Check the wiring of fan
motor. Are all the
connections good?
The unit operates normally.
No—�
Find out the cause and
have it solved. For
example, check whether
the fan is blocked or the
screws which secure the
fan are tight.
No► Correct the connections.
Yes
1
Check whether the outdoor PCB —Now Replace the outdoor PCB
is normal through index 1?
Yes
Replace the fan motor No
BOSCH
Service Manual
Index 1:
1. DC fan motor(control chip is inside fan motor)
Power on and when the unit is in standby, measure the voltage of pin 1-pin3,
pin3-pin4 in fan motor connector. If the value of the voltage is not in the range
showing in below table, the PCB must have problems and need to be replaced.
ICI ICI lEl ICI ICI lil
Figure 68
Figure 69
DC motor voltage input and output
1
Red
Vs/Vm
200-380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
13.5-16.5V
5
Yellow
Vsp
0-6.5V
6
Blue
FG
13.5-16.5V
Table 38
Service Manual
® BOSCH
2. DC Fan Motor (control chip is in PCB)
Release the UVW connector. Measure the resistance of U-V, U-W, and V-W. If
the resistances are not equal to each other, the fan motor may be experiencing
problems and need to be replaced. Otherwise, the PCB must has problems and
need to be replaced.
UVW
Figure 70
BOSCH
Service Manual
8.6.8 High pressure protection (PC 30)
Error Code I PC 30
Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure.
► Improper/ Incorrect Wiring
0-Overload protector faulty
Supposed causes ► System blockage
► Outdoor PCB faulty
Table 39
Troubleshooting:
High pressure protection
Check whether the wiring
between the high pressure
switch and outdoor PCB NO—►
Correct wiring
is correct and connected
properly
Yes
Check if the high
pressure protector
s broken
Disconnect the plug.the
resistance of theessure
protector, if Noector
t
is normal thehould
be 0
Yes
Check whether the outdoor
ambient temperature is Yes—► Stop the unit
higher than 50°C
No
Check if the outdoor unit NOS
Ensure the outdoor unit is ventilated properly
is ventilated properly
Yes
Check if the outdoor fan runs
Please refer to E8 fault
No
troubleshooting steps defined
properly
in Section 8.6.7
Yes
Check whether the heat \�\1
—Yes
Clean the heat exchanger
exchanger is dirty /
No
Replace the outdoor
:>
PCB
No
It
Check whether the refrigerant
system is ok
Figure 71
-4
tow �,... �..
Rom`
t
s ►
681 Bosch Climate 5000 Series Ductless Air Conditioner/ Heat Pump Multi Zone Outdoor Units (01.2023)
BOSCH
Service Manual
8.6.9 Low pressure protection (PC 31)
Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
Table 40
Troubleshooting:
Figure 73
► Improper/ Incorrect Wiring
► Overload protector faulty
► System blockage
► Outdoor PCB faulty
Low pressure protection
Check her the win ng
between the low pressure
protector and the outdoor No—► Correct wiring
PCB is correct and well
connected
Yes
Check if low pressure
protector is damaged
Method: Disconnect the plug.
Measure the resistance of the
low pressure protector. If the No ►Replace the low pressure protector
protector is normal the value
should be o
Yes
Check whether the outdoor
ambient temperature Yes—► Stop the system
is too low
No
Check whether valve core
of high pressure valve is No Fully open valve core of
high pressure valve
opened
Yes
Please refer to the solution of fan
Check if the indoor fan runs speed has been out of control
No
properly in cooling mode malfunction. Find out the cause and
have it solved
Yes
Replace outdoor PCB
No
Does the system has sufficient Charge the unit with proper
amount of refrigerant? No amount of refrigerant as
defined in the IOM
Yes
System should operate normally
.A .
E
•
r
4
it A A .
0
7 0 1 Bosch Climate 5000 Series Ductless Air Conditioner/ Heat Pump Multi Zone Outdoor Units (01.2023)
BOSCH
Service Manual
8.6.10 Current overload protection (PC 08) Outdoor unit zero speed
protection (PC 44) Compressor speed has been out of control (PC
46)Compressor overcurrent failure (PC 49)
MMM
Error Code �IfCthoe
8/PC 44/PC 46/7th,
7
Malfunction decision conditions outdoor currentmit value, theLED will display the failure.
Supposed causes
Table 41
Troubleshooting:
Figure 75
► Improper/ Incorrect Wiring
► Overload protector faulty
► System blockage
P. Outdoor PCB faulty
Current protection of compressor
Check whether the input current
of power supply wire is more than
-18K Regular model: 15A
- 27K Regular & 18K Max Performance models: 18.SA No—► Replace outdoor main board
-36K Regular & 27K Max Performance models: 22.5A
-48K Regular & 36K Max Performance models: 28A
Yes
Check whether the
refrigerant system
s ok
Check whether the
outdoor ambient temperature Yes--► Stop the system
is higher than 50°C
No
Check whether the
outdoor unit has Yes
Make sure the outdoor unit has
proper ventilation and clearance.
proper ventilation and clearance
No
Check whether the yes —
:Jean the heat exchanger
heat exchanger is dirty
No
Let the refrigerant out, then use the high
Check if the refrigerant —Yes
pressure nitrogen or refrigerant to blow pipe,
pipe is blocked
vacuumize and charge the refrigerant again
No
Replace outdoor PCB
and check whether the
system can run normally
No
Replace the electric control box Yes---*( Problem is solved
A,
�i=Mown J
,Ova
A gANOw •
1itW � • � •' Mira
• •
3ge-
77-0
...
V
uAj,�t �Ngo_
n v
�pM
72 1 Bosch Climate 5000 Series Ductless Air Conditioner/ Heat Pump Multi Zone Outdoor Units (01.2023)
BOSCH
Service Manual
8.6.11 Temperature protection of compressor discharge (PC 06)
Error Code
Malfunction decision conditions
Supposed causes
Table 42
Troubleshooting:
Temperature protection of
compressor discharge
PC 06
When the compressor discharge temperature(T5) is more than 115°C for 10 seconds, the compressor
will stop and restart when T5 is less than 90oC.
► Improper/ Incorrect Wiring
► System refrigerant leakage
► Discharge temperature (T5) sensor faulty
► Outdoor PCB faulty
Check whether the Check if
compressor discharge temp. is —Yes there is any refrigerant Yes Fix leakage and
more than 115°C (239°F) leakage re -charge the system.
No
i No
Check whether the
connection is corect between
compressor discharge temp.
sensor and PCB according
to wiring diagrams?
Yes
Measure the resistance value
of compressor discharge
temp. sensor is within the normal
range according to Appendix 2.
Yes
Replace outdoor main PCB
No
Replace high pressure valve assembly
Figure 77
o—► Correct the wiring connection
o—►I Replace the compressor discharge temp. sensor
Service Manual BOSCH
8.6.12 High temperature protection of condenser (PC OA)
Error Code C OA
Malfunction decision conditions When the outdoor pipe temperature is more than 65°C, the system will stop. The system will operate
again when outdoor pipe temperature is less than 52°C.
► Condenser temperature sensor (T3) faulty
Supposed causes ► Dirty heat exchanger
► System leakage or blockage
Table 43
Troubleshooting:
High temperature protection of
condenser Check the connection
between temperature No—► Correct the connection
No sensor and PCB.
Yes
Check whether the
condenser temperature is
Higher than 65°C (149°F) Check whether the
resistance of condenser
temp. sensor is within normal No Replace the temperature sensor
range as defined
Yes in Appendix 1
Check whether the outdoor `
\ ambient temperature is Yes—► Stop the system
higher than 50°C (122°F)
No
Check if the outdoor unit NoEnsure outdoor unit is
is properly ventilated -► properly ventilated
Yes
CCheck if the7ouldfan Follow troubleshooting steps outlined
No in Section 8.6.7.Outdoor fan speed
isrunninmalfunction (E8)
i
Yes
Check whether the heat
exchanger is dirty Yes—► Clean the heat exchanger Yes
No
Replace outdoor PCB
No
if
Check refrigerant level and
add as necessary
Figure 78
BOSCH
Service Manual
8.6.13 Inverter module (IPM) malfunction (P6)
Error Code
Malfunction decision conditions
Supposed causes -A
Table 44
Troubleshooting:
IPM module protection
PC 00
When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show
"P6" and AC will turn off.
► Improper/ Incorrect Wiring
► IPM malfunction
► Outdoorfanassemblyfaulty
► Compressor malfunction
► Outdoor PCB faultv
Check whether the voltage range
of P-N on IPM module is within normal
DC277-356V for 18K & 27K models o
DC277-410V for 36K & 48K models
check whether the connecting
line between the main board and o Connect it tightly
t\M module is connected
tightly
connecting line of the
compressor is tight and N Connect it well
/Replace the IPM module,
and check whether the system
Correct input
,he whetherthe inpu power supply and
power supply is correct? N check whether the system
\ 208-230V, 1N, 6011z can work normally?
Power
supply line is N Connect it correctly
nnected correctly and and tightly
tightly
Yes
No
Follow troubleshooting steps yes
heck if the outdoor fa outlined in Section 8.6.7.
runs normally and is Yes Outdoor fan speed
ventilated properly malfunction (E8)
No
Replace the PCB and check
whether the system can work
normally?
place the compressor, and
check whether the system can
yes work normally?
Figure 79
xk whether the lii
in E-partbox are
connected tightly
Problem is solved
Connect it tightly
Check whether the bridge rectifiers are
normal? Use the multimeter to measure
the resistance between each two
terminals, check whether the
value of resistance is 0
No
Yes
Replace the bridge rectifiers
Check whether the connecting line of
reactors are normal? If the line is broken,
the resistance of the two ports should be
.; Check whether the PFC module is
broken (applicable for 36K&48K regular
m„ Iti s—i
No
Replace the connecting line,
reactor, orthe PFC
module (for 36K & 48K regular
multi zone models)
Service Manual
0 BOSCH
8.6.14 High temperature protection of compressor top (PC 02)
Error Code
Malfunction decision conditions
Supposed causes
Table 45
Troubleshooting:
(Chec
k if the air flow system
of indoor and outdoor units
are obstructed?
No
Turn off the power supply and turn
it on 10 minutes later.
Yes
Check if the temperature
on top of compressor
Is more than 90oC (194°F)
PC 02
If the sampling voltage is not 5V, the LED will display the failure.
► Improper/ Incorrect Wiring
No. Overload protector faulty
► System leakage or blockage
► Outdoor PCB faulty
Clear up the air inlet and outlet as well as the heat
exchanger of indoor and outdoor units.
Check if all the connection, especially
the connection of overload protector No► Correct the connection.
sensor is secure.
L Yes
Yes
Measure the resistance
Check if there is any between the two ports of —Now Replace the overload protector.
refrigerant leaking the overload protector.
Is it zero?
No
Yes �Yes� Replace the outdoor PCB.
Replace the outdoor PCB. Refrigerant leak should be repaired
and unit properly recharged.
Figure 80
(�J BOSCH
Service Manual
8.6.15 Lack phase failure of outdoor DC fan motor (EC 72)
Troubleshooting:
ewer off,then restart the unit I The unit operates
2 minutes later.ls it still Now normally
displaying the error code
Yes
motor.Are all the connections �--No--► Correct the connections
Yes
Check whether the three-
phase resistance of the fan is Now Replace the fan motor
symmetrical
Yes
Check the fan three-phase
output for obvious open —No--*-[ Replace the main PCB
circuit
Yes
Problem is solved
Figure 81
Service Manual
i BOSCH
8.6.16 Outdoor compressor lack phase protection (PC 43)
Troubleshooting:
Power off,then restart the unit The unit operates
2 minutes later.ls it still N0—► normally
displaying the error code
Yes
1
Check both ends of
compressor connecting Now Correct the connections
line .Are all the connections
good?
Yes
Check whether the three-
phase resistance of the Now Replace the compressor
compressor is symmetrical
Yes
Check the compressor three-
phase output for obvious Now Replace the main PCB
open circuit
Yes
Trouble is solved
Figure 82
8.6.17 Outdoor unit IR chip drive failure (PC 45)
Troubleshooting:
Power off,then restart the unit
2 minutes later.
Yes
Replace the inverter module
PCB.
Figure 83
BOSCH
Service Manual
8.6.18 Communication malfunction between adapter board and outdoor
main control board (ODU Ed)
Error Code
Malfunction decision conditions
Supposed causes
Table 46
Troubleshooting:
Figure 84
ODU Ed
If outdoor PCB does not receive feedback from adapter board.
► Wiring mistake
► Faulty PCB
Power off, then restart the unit after 3
minutes.
oes a problem remain? NO
YES
Check the wirings and connections
all the
YES
YES
Replace the outdoor main control
board
The unit is operating normally
Ensure proper connections
The problem is solved
Service Manual
i BOSCH
8.6.15 Main Parts Check
1. Temperature sensor check
WARNING: ELECTRICAL HAZARD
► Be sure to turn off all power supplies or disconnect all wires
to avoid electric shock.
► Operate after compressor and coil have returned to normal
temperature to avoid injury.
► Disconnect the temperature sensorfrom PCB.
► Measure the resistance value of the sensor using a multi -meter.
► Check corresponding temperature sensor resistance value table
(Appendix 1).
r/gutt 00
The picture and the value are only for reference, actual condition and
1 specific value may vary.
Temperature sensors:
► Room temp.(Tl) sensor,
► Indoor coil temp.(T2) sensor,
► Outdoor coil temp.(T3) sensor,
► Outdoor ambienttemp.(T4) sensor,
► Compressor discharge temp.(T5)sensor.
BOSCH
Service Manual
Appendix 1 Resistance to Temperature value table for resistive sensors:
T1,T2,T3,T4 (°C/°F/K Ohm)
-20
-4
115.266
20
68
12.6431
60
140
2.35774
100
212
0.62973
-19
-2
108.146
21
70
12.0561
61
142
2.27249
101
214
0.61148
-18
0
101.517
22
72
11.5
62
144
2.19073
102
216
0.59386
-17
1
96.3423
23
73
10.9731
63
145
2.11241
103
217
0.57683
-16
3
89.5865
24
75
10.4736
64
147
2.03732
1 104
219
0.56038
-15
5
84.219
25
77
10
65
149
1.96532
105
221
0.54448
-14
7
79.311
26
79
9.55074
66
151
1.8962
106
223
0.52912
-13
9
74.536
27
81
9.12445
67
153
1.83003
107
225
0.51426
-12
10
70.1698
28
82
8.71983
68
154
1.76647
108
226
0.49989
-11
12
66.0898
29
84
8.33566
69
156
1.70547
109
228
0.486
-10
14
62.2756
30
86
7.97078
70
158
1.64691
110
230
0.47256
-9
16
58.7079
31
88
7.62411
71
160
1.59068
ill
232
0.45957
-8
18
56.3694
32
90
7.29464
72
162
1.53668
112
234
0.44699
-7
19
52.2438
33
91
6.98142
73
163
1.48481
113
235
0.43482
-6
21
49.3161
34
93
6.68355
74
165
1.43498
114
237
0.42304
-5
23
46.5725
35
95
6.40021
75
167
1.38703
115
239
0.41164
-4
25
44
36
97
6.13059
76
169
1.34105
116
241
0.4006
-3
27
41.5878
37
99
5.87359
77
171
1.29078
117
243
0.38991
-2
28
39.8239
38
100
5.62961
78
172
1.25423
118
244
0.37956
-1
30
37.1988
39
102
5.39689
79
174
1.2133
119
246
0.36954
0
32
35.2024
40
104
5.17519
80
176
1.17393
120
248
0.35982
1
34
33.3269
41
106
4.96392
81
178
1.13604
121
250
0.35042
2
36
31.5635
42
108
4.76253
82
180
1.09958
122
252
0.3413
3
37
29.9058
43
109
4.5705
83
181
1.06448
123
253
0.33246
4
39
28.3459
44
ill
4.38736
84
183
1.03069
124
255
0.3239
5
41
26.8778
45
113
4.21263
85
185
0.99815
125
257
0.31559
6
43
25.4954
46
115
4.04589
86
187
0.96681
126
259
0.30754
7
45
24.1932
47
117
3.88673
87
189
0.93662
127
261
0.29974
8
46
22.5661
48
118
3.73476
88
190
0.90753
128
262
0.29216
9
48
21.8094
49
120
3.58962
89
192
0.8795
129
264
0.28482
10
50
20.7184
50
122
3.45097
90
194
0.85248
130
266
0.2777
11
52
19.6891
51
124
3.31847
91
196
0.82643
131
268
0.27078
12
54
18.7177
52
126
3.19183
92
198
0.80132
132
270
0.26408
13
55
17.8005
53
127
3.07075
93
199
0.77709
133
271
0.25757
14
57
16.9341
54
129
2.95896
94
201
0.75373
134
273
0.25125
15
59
16.1156
55
131
2.84421
95
203
0.73119
135
275
0.24512
16
61
15.3418
56
133
2.73823
96
205
0.70944
136
277
0.23916
17
63
14.6181
57
135
2.63682
97
207
0.68844
137
279
0.23338
18
64
13.918
58
136
2.53973
98
208
0.66818
138
280
0.22776
19
66
13.2631
59
138
2.44677
99
210
0.64862
139
282
0.22231
Table 47
Service Manual
BOSCH
Appendix 2 Resistance to Discharge Temperature value table: T5 (°C/°F/K
Ohm)
-20
-4
542.7
20
68
68.66
60
140
13.59
100
212
3.702
-19
-2
511.9
21
70
65.62
61
142
13.11
101
214
3.595
-18
0
483
22
72
62.73
62
144
12.65
102
216
3.492
-17
1
455.9
23
73
59.98
63
145
12.21
103
217
3.392
-16
3
430.5
24
75
57.37
64
147
11.79
104
219
3.296
-15
5
406.7
25
77
54.89
65
149
11.38
105
221
3.203
-14
7
384.3
26
79
52.53
66
151
10.99
106
223
3.113
-13
9
363.3
27
81
50.28
67
153
10.61
107
225
3.025
-12
10
343.6
28
82
48.14
68
154
10.25
108
226
2.941
-11
12
325.1
29
84
46.11
69
156
9.902
109
228
2.86
-10
14
307.7
30
86
44.17
70
158
9.569
110
230
2.781
-9
16
291.3
31
88
42.33
71
160
9.248
ill
232
2.704
-8
18
275.9
32
90
40.57
72
162
8.94
112
234
2.63
-7
19
261.4
33
91
38.89
73
163
8.643
113
235
2.559
-6
21
247.8
34
93
37.3
74
165
8.358
114
237
2.489
-5
23
234.9
35
95
35.78
75
167
8.084
115
239
2.422
-4
25
222.8
36
97
34.32
76
169
7.82
116
241
2.357
-3
27
211.4
37
99
32.94
77
171
7.566
117
243
2.294
-2
28
200.7
38
100
31.62
78
172
7.321
118
244
2.233
-1
30
190.5
39
102
30.36
79
174
7.086
119
246
2.174
0
32
180.9
40
104
29.15
80
176
6.859
120
248
2.117
1
34
171.9
41
106
28
81
178
6.641
121
250
2.061
2
36
163.3
42
108
26.9
82
180
6.43
122
252
2.007
3
37
155.2
43
109
25.86
83
181
6.228
123
253
1.955
4
39
147.6
44
ill
24.85
84
183
6.033
124
255
1.905
5
41
140.4
45
113
23.89
85
185
5.844
125
257
1.856
6
43
133.5
46
115
22.89
86
187
5.663
126
259
1.808
7
45
127.1
47
117
22.1
87
189
5.488
127
261
1.762
8
46
121
48
118
21.26
88
190
5.32
128
262
1.717
9
48
115.2
49
120
20.46
89
192
5.157
129
264
1.674
10
50
109.8
50
122
19.69
90
194
5
130
266
1.632
11
52
104.6
51
124
18.96
91
196
4.849
12
54
99.69
52
126
18.26
92
198
4.703
13
55
95.05
53
127
17.58
93
199
4.562
14
57
90.66
54
129
16.94
94
201
4.426
15
59
86.49
55
131
16.32
95
203
4.294
16
61
82.54
56
133
15.73
96
205
4.167
17
63
78.79
57
135
15.16
97
207
4.045
18
64
75.24
58
136
14.62
98
208
3.927
19
66
71.86
59
138
14.09
99
210
3.812
Table 48
C0- BOSCH
Service Manual
2. Compressorcheck
Measure the resistance value of each winding by using the tester.
Input Terminal Blue
Blue 1
Red 2
Black
Black 3
Red
Figure 86
Figure 87
Table 49
Service Manual
(W BOSCH
3. IPM continuity check
A
WARNING: ELECTRICAL HAZARD
► Electricity remains in capacitors even when the power
supply is off. Ensure the capacitors are fully discharged
before trouble shooting.
Turn off the power, let the large capacity electrolytic capacitors discharge
completely, then dismount the IPM. Use a digital tester to measure the resistance
between P and UVWN; UVW and N.
Table 50
Figure 88
BOSCH
Service Manual
4. Four - Way Valve
Step 1. Power on, use a digital tester to measure the voltage. When the unit
operates in cooling mode, value should be OV. When the unit operates in heating
mode, the value should be approximately 230VAC.
If the value of the voltage is not in the range, the PCB may have problems and need
to be replaced.
Figure 89
Step 2. Turn off the power, use a digital tester to measure the resistance. The value
should be between 1.8-2.5 KO.
Figure 90
Service Manual
BOSCH
5. EXV check
Step 1. Disconnect EXV connectors from PCB
Figure 91
Step 2. Check the resistance value on EXV coil
Red- Blue
Red - Yellow
Approximately 500
Brown -Orange
Brown -White
Table 51
BOSCH
Service Manual
9 Disassembly Guide
Pictures are provided as a reference only. Each unit will be different
1 depending on the your model number.
9.1 Outdoor Unit • BMS500•AAM018•1CSXRC
9.1.1 Removing the panel plates
1. Stop operation of the system and turn "OFF" the power at the disconnect.
2. Remove the big handle (3 screws).
Screws of
big handle
Figure 92
3. Remove the top cover (3 screws).
Figure 93
4. Remove the front panel (7 screws).
Figure 94
Screws of front panel
Screws of front panel
Screws of front panel:
Lit
Figure 95
5. Remove the screws of water collector, and remove the water collector. (3
screws)
Figure 96
Screws of water collector
Service Manual
® BOSCH
6. Remove the right side panel (2 screws from terminal block and 9 screws from
right side panel).
higure .9/
9.1.2 Removing the fan assembly
1. Stop operation of the system and turn "OFF" the power at the disconnect.
2. Remove the top cover, right side panel and front panel following Section
9.1.1.
3. Remove the hex nut that is fixing the fan.
r,6u,c aV
4. Remove the fan.
5. Remove the four fixing screws of the fan motor, then remove the fan motor.
, ,6u, c —
BOSCH
Service Manual
9.1.3 Removing the electrical parts
1. Follow steps outlined in Section 9.1.1.
2. Remove 5 screws of the cover of electrical control box cover and remove it.
Screws
Figure 100
3. Cut the ribbon by a shear and disconnect the 4-way valve connector
CN38(2p,blue).
rigure lvl
4. Turnover the main board.
5. Remove the electronic installing box subassembly (4 hooks).
rigure LUZ
6. Remove the support of electronic control box.
Figure 103
7. Disconnect the connectors and wires connected from PCB and other parts.
Figure 104
8. Disconnect the grounding wire (yellow -green) after removing the big handle
and the right -rear panel.
Figure 105
9. Remove the PCB board.
Service Manual
® BOSCH
9.1.4 Removing the compressor
1. Follow steps outlined in Sections 9.1.1, 9.1.2, 9.1.3.
2. Remove the electrical control box cover and extract refrigerant from the
refrigerant circuit.
3. Remove the sound insulation material and crankcase heating cable.
4. Remove terminal cover of compressor, and disconnect wires of crankcase
electric heater and compressor from the terminal.
5. Remove the discharge pipe and suction pipe with a burner
rigure luo
6. Remove the hex nuts and washers fixing the compressor on bottom plate.
risuie lui
7. Lift the compressor from the base pan assembly.
9.1.5 Removing the 4-way valve
1. Follow steps outlined in Sections 9.1.1 & 9.1.2.
2. Extract refrigerant gas and remove electrical parts by following previous step.
3. Remove fixing screw of the coil, and remove the coil.
4. Detach the welded parts of 4-way valve and pipe.
Welded parts
Figure 108
9.1.6 Removing the expansion valve
1. Follow steps outlined in Sections 9.1.1, 9.1.2 & 9.1.3.
2. Remove the coils & detach the welded parts of expansion valves and pipes.
I
I' Expansion
valves
� I
Figure 109
(�J BOSCH
9.2 Outdoor Unit - BMS500-AAM027.1CSXRC,
BMS500-AAM018-1CSXHC, BMS500-AAM027-1CSXHC
9.2.1 Removing the panel plate
1. Stop operation of the system and turn "OFF" the power at the disconnect.
2. Remove the big handle (4 screws).
Screws of
big handle
Figure 110
3. Remove the top cover (4 screws).
Screws of top cover
avowjr
\� - ,
\�goo i0o
Figure 111
4. Remove the right side panel (1 screw).
Figure 112
5. Remove the front panel (8 screws).
Figure 113
Service Manual
Screw
=eeo r
L41
Screws of front panel
IN
m-IN
-
Service Manual
G BOSCH
Screws of front panel
- -�
Screws of front panel
Figure 114
6. Remove the right & rear panel (15 screws).
so
Screws of right -rear panel
_
Will
I
Figure 115
7. Remove the terminal board (2 screws).
Screws of
terminal board
il — 0
Figure 116
9.2.2 Removing the fan assembly
1. Follow steps outlined in Section 9.2.1.
Ramrn/a tha haY mit fiYinv tha fan nnri than ramnva tha fan
3. Remove the cover of electrical control box cover.
Figure 118
BOSCH
Service Manual
4. Disconnect the fan motor connector CN14 from the IPM board.
5. Remove the four fixing screws of the fan motor. Then remove the fan motor.
Figure 120
9.2.3 Removing the electrical parts
1. Follow steps outlined in Section 9.2.1 & 9.2.2.
2. Remove the screws of the IPM board (4 screws).
Figure 121
3. Disconnect the connector to reactor from PCB.
Figure 122
4. Disconnect the compressor wire.
Figure 123
PCB board
Service Manual
(.0-) BOSCH
5. Disconnect wires between IPM board and PCB as shown below.
6. Remove the IPM board.
Figure 125
7. Disconnect
the connectors and wires connected the PCB from other parts.
Connectors:
►
CN17: T3/T4 Temperature sensor (2p/2p,white)
►
CN7: Discharge temperature sensor (2p,white)
►
CN15:T2B-A,B,C temperature sensor (2p/2p/2p,white)
►
CN18/CN19/CN22: Electronic expansion valve A,B,C
(6p/6p/6p,red/red/red)
►
CN25/CN23/CN20: S-A,S-B,S-C (3p/3p/3p,white/white/white)
Wires:
► CN1/CN2: 4-way valve (blue -blue)
► CN5/CN6: Crankcase heating cable (red -red)
► CN3:L1-IN (red)
► CN4:L2-IN (black)
8. Disconnect the grounding wire (yellow -green).
Figure 127
9. Remove PCB.
BOSCH
Service Manual
9.2.4 Removing the compressor
1. Follow steps outlined in Sections 9.2.1, 9.2.2 & 9.2.3.
2. Recover refrigerant from the refrigerant circuit.
3. Remove the sound insulation material and crankcase heating cable.
4. Remove terminal cover of compressor and disconnect wires of compressor
thermo and compressor from the terminal.
5. Apply heat and remove discharge and suction pipes.
6. Remove the hex nuts and washers fixing the compressor on bottom plate.
7. Lift the compressor from the base pan assembly.
9.2.5 Removing the reactor
1. Follow steps outlined in Sections 9.2.1 & 9.2.2.
2. Disconnect the connection between the reactor and IPM board.
3. Remove the cover of inductance (2 screws).
1'
_ Inductance
Cover
Screws
Figure 130
4. Disconnect two pieces of wires connected from the cover of inductance.
5. Remove the reactor (4 screws).
Figure 131
Screws of
reactor
Service Manual
® BOSCH
9.2.6 Removing the 4-way valve
1. Follow steps outlined in Sections 9.2.1 & 9.2.2.
2. Extract refrigerant gas.
3. Remove the electrical parts from Section 9.2.3.
4. Remove fixing screw of the coil and remove the coil (1 screw).
r1gure laZ
5. Detach the welded parts of 4-way valve and pipe.
risure too
9.2.7 Removing the expansion valve
1. Follow steps outlined in Section Sections 9.2.1, 9.2.2, 9.2.3 and evacuate
the refrigerant from the unit.
2. Remove the coils and detach the welded parts of expansion valves & pipes.
riguie Lao
(�J BOSCH
Service Manual
9.3 Outdoor Unit- BMS500-AAM036-1CSXHC,
BMS500-AAM048.1CSXRC, BMS500-AAM048.1CSXHC
9.3.1 Removing the fan assembly
1. Stop operation of the system and turn "OFF" the power at the disconnect.
2. Remove the air outlet grille (8 screws).
rigure i.so
3. Remove the nut fixing the fan, and remove the fan.
rigure i la
4. Remove the top cover (4 screws).
Screws of top cover
____ .+
BE
EE
ElElEl
al
LO
_
Figure 137
5. Remove the front side panel (1 screw).
Figure 138
6. Disconnect the fan motor connectors FAN 1(3p, white) and FAN2 (3p, white)
from DC motor driver board.
Figure 139
Service Manual
® BOSCH
7. Remove the four fixing screws of the fan motor. Then remove the fan motor
Figure 140
9.3.2 Removing the panel plate
1. Stop operation of the air conditioner and turn "OFF" the power breaker.
2. Remove the big handle and water collector (4 screws).
Screws
of big
handle
Screws of
Water collector
Figure 141
3. Remove side and rear panel (17 screws).
Figure 142
,I
Screws of
terminal board
Screws of right
rear panel
Screws of right
rear panel
BOSCH
Service Manual
9.3.3 Removing the electrical parts
1. Follow steps outlined in Section 9.4.2.
Figure 143
2. Disconnect the fan motor connector (5p, white) from the IPM board.
Figure 144
3. Disconnect following connection wires and connectors from the IPM board.
► CN1, CN2, CN3, CN6, CN9 and U, V, W
rigute 14i
4. Remove the 4 screws and unfix the 4 hooks and then remove the IPM module
board.
5. Disconnect the connectors and wires connected from the PCB.
Connectors:
► CNB: Discharge temperature sensor (2p, white)
► CN12: Heat sink temperature sensor (2p, red)
► CN9: T3/T4 temperature sensor (2p/2p, white)
► CN11: T2B-A, B, C, D, E temperature sensor (2p/2p/2p/2p/2p,
white)
► CN15/CN23/CN26/CN30/CN33: Electronic expansion valve
(6p/6p/6p/6p/6p, red)
► CN37/CN29/CN21/CN16/CN13/CN7:S-A,S-B,S-C,S-D,S-E
(3p/3p/3p/3p/3p, white)
► CN10: High and low pressure switch (2p/2p, white)
Wires:
► CN17/CN18: 4-way valve (blue -blue)
► CN19/CN20: Connected to crankcase
► heating cable (black -red)
► CN24/CN25: Electric heater of
► chassis (orange -orange)
► CN1: L-IN (red)
► CN3: WIN (black)
Service Manual
® BOSCH
Figure 146
6. Disconnect the ground wire (yellow -green) after removing the big handle.
r ••ass,.,...
Figure 147
7. Remove the 4 screws and unfix the 6 hooks and then remove the main control
board.
Figure 148
8. Remove the 2 screws and then remove the adapter board assy.
it 11Screws of
adapter board
1
Figure 149
Figure 150
BOSCH
Service Manual
9.3.4 Removing the compressor
1. Follow steps outlined in Section 9.4.2.
2. Recover refrigerant from the refrigerant circuit.
3. Remove the sound insulation material and crankcase heating cable.
4. Remove terminal cover of compressor, and disconnect wires of crankcase
electric heater and compressor from the terminal.
5. Remove the discharge pipe and suction pipe with a burner.
Figure 151
6. Remove the hex nuts and washers fixing the compressor on bottom plate.
rigure 13Z
7. Lift the compressor from the base pan assembly.
9.3.5 Removing the 4-way valve
1. Follow steps outlined in Sections 9.4.2 & 9.4.3.
2. Recover refrigerant from the refrigerant circuit.
3. Remove the coil (1 screw) and detach the welded parts of 4-way valve & pipe.
Figure 153
9.3.6 Removing the expansion valve
1. Follow steps outlined in Sections 9.4.2 & 9.4.3.
2. Remove the coil.
3. Detach the welded parts of expansion valves and pipes.
Figure 154
Expansion
valves
Service Manual
® BOSCH
Online Help Resources
Alternatively, please visit our Service & Support webpage to find FAQs, videos,
service bulletins, and more; www.boschheatingcooling.com/service or use your
cellphone to scan the code below.
o;o❑1 10
•
SCAN ME LNI
Figure 155
BOSCH Service Manual
United States and Canada
Bosch Thermotechnology Corp.
65 Grove St.
Watertown, MA 02472
Tel: 866-642-3198
Fax: 954-776-5529
www.bosch-thermotechnology.us
BTC 769102304 A / 01.2023
Bosch Thermotechnology Corp. reserves the right
to make changes without notice due to continuing
engineering and technological advances.