BLD2021-0892_Manufacturer_Specifications_and_Installation_Instructions_6.25.2021_11.39.31_AM_2269804LENNOX
.2019 Lennox Industries Inc.
Dallas, Texas, USA
,-D
Table of Contents
General...........................................................................1
Optimal Performance......................................................1
UnitParts........................................................................2
Features.........................................................................3
AutoRestart.................................................................3
Anti -Mildew ..................................................................
3
LouverAngle Memory ..................................................3
Refrigerant Leakage Detection....................................3
Louver Adjustment..........................................................3
Return Air Filters.............................................................3
Cleaning Return Air Filters...........................................3
Air Filter Reminders.....................................................4
Operation (Manual) - Forced Cooling Mode...................4
Operation (Wireless Remote Controller) ........................4
Requirements..............................................................4
Remote Control Holder...............................................4
Remote Control Specifications....................................4
Function Buttons..........................................................5
Display.........................................................................
5
Operating Instruction...................................................6
Troubleshooting..............................................................7
FCC Compliance Statement — PART 15.19..................8
General
This wall -mounted indoor unit is matched with an outdoor
heat pump unit to create a mini -split system that uses
HFC-410A refrigerant.
USER GUIDE
MHA Series Units
SINGLE -ZONE MINI -SPLIT SYSTEM
(115V and 208/230V)
507928-01 6/2019
Supersedes 3/2019
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
Optimal Performance
Optimal performance for the COOL, HEAT and DRY
modes can be achieved in the following temperature
ranges. When your heat pump is used outside of these
ranges, certain safety protection features will activate and
cause the unit to perform less than optimally.
Table 1. Cool, Heat and Dry Mode Optimal
Performance Ranges
Temp
Location
Cool or Dry Modes
Heat Mode
62°F - 90°F
62°F - 90°F
Room
(17°C - 32°C)
(17°C - 32°C)
5°F - 86°F
5°F - 86°F
Outdoor
(-15°C to 30°C)
(-15°C to 30oC)
To further optimize the performance of your unit, do the
following:
• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER
OFF functions.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
DO NOT spray water on the indoor unit for any reason.
Do not touch the unit or the controller if your hands are
wet.
Do not insert your hands, tools or any other item into the
air intake or air outlet at either the indoor or outdoor unit.
Do not remove the outdoor unit fan guard for any reason.
If outdoor unit is installed on a raised stand, check
condition of stand occasionally to ensure that it remains
stable.
Do NOT install sprinklers or soaker hoses where they
can expose the outdoor unit to treated water. Prolonged
exposure to treated water will corrode the surface
of the steel and aluminum parts and will diminish the
performance of the unit.
System operation is controlled by either the provided
wireless or optional wired remote control. Refer to the
manual provided with the control for system operation.
To ensure comfort, make sure that temperature selection
has been properly set at the unit controller or wireless
remote control.
To ensure efficient operation, do not block air intake or
outlet at either the indoor or outdoor unit.
Do not stand on outdoor unit or store items on top of
unit.
Make sure that indoor unit directional louvers are
properly adjusted.
Features I I Return Air Filters
Auto Restart Blocked or dirty return air filters affect system operation and
If the unit loses power, it will automatically restart with the efficiency. Air filters should be checked monthly in order toensure proper air flow to the indoor unit. It may be necessary
prior settings once power has been restored. to check the filter more frequently if the unit is installed in an
Anti -Mildew area with a large amount of dust.
When turning off the unit from COOL or DRY modes, the
heat pump will continue to operate at very low power to dry
up condensed water and prevent mildew growth.
Louver Angle Memory
When turning on your unit, the louver will automatically
resume its former angle operation.
Refrigerant Leakage Detection
The indoor unit will automatically display "EC" if it detects
refrigerant leakage. For a detailed explanation of your unit's
advanced functionality (such as TURBO mode and its self-
cleaning functions), refer to "Operation (Wireless Remote
Controller)" on page 4.
Louver Adjustment
DO NOT adjust the louvers by hand. Louvers are
adjustable only by using the furnished wireless remote
controller or optional wired controller.
Use the furnished wireless remote control or optional wired
controller to set the position of the discharge air louvers.
The louvers may be set to automatically swing between
the outward and downward positions, OR you may set the
louvers so that they are stationary in a single position. It is
always recommended to direct the horizontal discharge air
louvers outward while cooling.
Figure 2. Louver Operation
Refer to "Function Buttons" on page 5 for using the
swing and direct buttons.
The filter may be removed and cleaned, or it should be
replaced with a filter of like kind and size if it is impossible
to clean the filter.
Cleaning Return Air Filters
Check return air filters every two weeks and clean as
necessary. Lift the front panel of the indoor unit.
1. Grip the tab on the end of the filter, lift it up, then pull it
towards yourself.
2. Pull the filter out.
3. Clean the return air filters with warm soapy water. Use
only mild detergent.
O
Figure 3. Filter Removal and Service
4. Rinse the return air filter with fresh water and then
shake off excess water.
5. Dry filter in a cool and dry place. Refrain from
exposing filter to direct sunlight.
6. Slid return air filters back into the indoor unit.
7. Close the front panel.
3
Air Filter Reminders
Table 2. Air Filter Reminders
After 240 hours of use, the display
window on the indoor unit will flash "CL."
This is a reminder to clean your filter.
After 15 seconds, the unit will revert to its
previous display.
Air Filter Cleaning
Reminder
To reset the reminder, press the LED
button on your remote control 4 times, or
press the MANUAL CONTROL button 3
times. If you don't reset the reminder, the
"CL" indicator will flash again when you
restart the unit.
After 2,880 hours of use, the display
window on the indoor unit will flash "nF."
This is a reminder to replace your filter.
After 15 seconds, the unit ill revert to its
Air Filter
previous display.
Replacement
To reset the reminder, press the LED
Reminder
button on your remote control 4 times, or
press the MANUAL CONTROL button 3
times. If you don't reset the reminder, the
"nF" indicator will flash again when you
restart the unit.
Operation (Manual) - Forced Cooling Mode
In the event that your remote control fails to work, your unit
can be operated manually with the MANUAL CONTROL
button located on the indoor unit. Note that manual operation
is not a long-term solution, and that operating the unit with
your remote control is strongly recommended.
Indoor Unit Control Box
Area (under front panel)
Manual Control Button
Figure 4. Manual Control Button
IMPORTANT I
Unit must be turned off before using manual operation
procedures.
To operate your unit manually:
1. Open the front panel of the indoor unit.
2. Locate the MANUAL CONTROL button on the right-
hand side of the unit.
3. Press the MANUAL CONTROL button to activate
FORCED AUTO mode. Both FORCE HEATING and
COOLING is preset to 750F (24°C) and cannot be
manually adjusted.
4. Press the MANUAL CONTROL button second time
to activate FORCED COOLING mode. Force cooling
mode is preset to 750F (24°C) and cannot be manually
adjusted.
5. Press the MANUAL CONTROL button a third time
to activate FORCE HEATING mode. Force heating
mode is preset to 75°F (24°C) and cannot be manually
adjusted.
6. Press the MANUAL CONTROL button again to turn the
unit off.
7. Close the front panel.
Operation (Wireless Remote Controller)
IMPORTANT!
malfunction.Frequent changes to operating mode may cause system
• one between mode
•- • to stabilize.
Requirements
Using the remote controller
• Point the remote controller directly at the indoor unit.
• Stand within 26 feet (8 meters) of the indoor unit.
• Do not block the signal between the remote controller
and indoor unit.
NOTE. The remote controller will not function without a
clear line of sight to the indoor unit.
• Do not submerge the remote controller in liquid.
• Do not expose to direct sunlight.
• Do not drop or step on remote controller.
Remote Control Holder
Use field -provided fasteners to attach the remote controller
holder to any suitable vertical surface such as a wall.
Remote Control Specifications
Table 3. Specifications
Rated voltage
3.0 VDC (2 AAA batteries)
Min voltage for sending signal
to CPU
2.4 VDC
Effective transmitting distance
26 feet (8 meters)
Operation conditions
23°F to 140°F (-5 to 60°C)
4
Function Buttons
• Up arrow button. Press to increase the temperature
setpoint or to scroll through settings options.
• On/Off button. Press to turn the system on or off.
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Figure 5. Remote Control Buttons
Mode button. Press to scroll through the operation
modes:
Auto --> Cool --> Dry --+ Heat --� Fan.
• Fan speed. Press to scroll through the fan speeds:
Auto , Low --� Med —* High.
• Sleep button. Press to activate "night -mode". This will
automatically increase (cooling) or decrease (heating)
the setpoint 2°F (1 °C) increment per hour for the first
two hours. The modified setpoint will be set for five
hours. After seven total hours the indoor unit will turn
off.
NOTE: SLEEP mode is only available when the unit is in
COOL, HEAT orAUTO mode.
• Turbo button. Press to active turbo mode. In both
heating and cooling modes only, the indoor unit will
ramp up to reach the setpoint more quickly. After
reaching the setpoint or after 30 minutes, the indoor
unit will resume the previous operating conditions.
• Self Clean button. Press to activate self cleaning
mode. In cooling or dry mode only, the indoor unit will
temporarily change operation to allow condensate on
the indoor unit coil to evaporate, and then will return to
the previous operating conditions.
• Down arrow button. Press to decrease the tempera-
ture setpoint or scroll through settings options.
• Silence button. Press and release to activate quiet
mode operation. The indoor unit will change operation
to provide the quietest sound possible.
Frost Prevention Mode
• FP button. Press and hold for two seconds to acti-
vate frost prevention mode. In heating mode only, the
indoor unit will operate at a 46°F set point and the in-
door unit display will show "FP". To cancel, push the
"ON/OFF", "SLEEP", "FP", "MODE", "FAN SPEED"
or "UP/DOWN" buttons.
• Timer ON button. Press to set the number of hours of
delay before the indoor unit begins operation.
• Timer OFF button. Press to set the number of hours
of delay before the indoor unit stops operation.
• Swing button. Press once to initiate louver up and
down oscillation. Press again to stop louver oscillation.
Louvers remain in place where stopped. Not available
in all indoor unit models.
• Direct (Direction) button. Press to move louvers up
and down in 6 degree increments. Louvers remain in
place where stopped.
• LED button. Press the LED button to turn on the
indoor unit display (on units with display). Press the
button again to turn off the display.
Follow Me
• Follow Me button. Press to activate the wireless
remote air temperature sensor. This will also transfer
the temperature sensing function from the indoor unit
to the remote. The indoor unit's air temperature sen-
sor will be disabled. The indoor unit will regulate the
room temperature based on the temperature sensor
in the remote controller, rather than the sensor in the
indoor unit.
• The remote controller will send the indoor unit a signal
every three minutes. If the indoor unit doesn't receive
the signal for seven minutes, or if the button is pressed
again, the Follow Me function will terminate.
• The remote controller must remain pointed toward the
indoor unit and must be within 26 feet (8 meters) of the
unit. Do not remove the controller from the room or ob-
struct the signal of the remote controller during Follow
Me operation.
Display
Timer ON
Timer OFF
Remote Controller ON
,ansmitting Signal Display
Not Used
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Battery Charge Status
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Operation Modes
Night Mode
DRY ( - /,
Follow Me
HEAT •u H
FAN] FAN gum»u
Not Used
Fan Speed
Set Point or Room Temperature Not Used
NOTE: Quiet mode operation may result in insufficient
cooling or heating capacity. Press and release the
Silence button again to stop quiet mode operation. •
Figure 6. Remote Display
Remote controller On. Icon displays to indicate that
the remote controller is on.
5
• Transmitting display. Icon blinks once when a signal
is sent from the wireless remote controller.
• Operation mode. These icons show the current mode
of operation. Press the mode button to scroll through
the operation modes:
Auto , Cool --+ Dry , Heat , Fan.
• Setpoint or Room Temperature. Displays the Set -
point temperature during normal operation. Displays
the room temperature when in Follow me mode. Adjust
the setpoint with up & down arrow buttons. No display
when unit is in Fan mode.
• Remote controller On. Icon displays to indicate that
the remote controller is on.
• Transmitting display. Icon blinks once when a signal
is sent from the wireless remote controller.
• Operation mode. These icons show the current mode
of operation. Press the mode button to scroll through
the operation modes:
Auto , Cool � Dry --+ Heat � Fan.
• Setpoint or Room Temperature. Displays the set -
point temperature during normal operation. While in
follow me mode the wireless remote will display the
room temperature and the wall unit will display the
target set point temperature to be reached. Adjust the
setpoint with up and down arrow buttons. No display
when unit is in Fan mode.
• Timer ON/OFF. These icons light up to indicate that
the indoor unit has a timed auto -start or auto -stop set
up. Battery charge status. Icon displays charge sta-
tus of wireless remote controller batteries.
• Sleep mode. Icon displays to indicate that sleep mode
operation is on.
• Follow me. This icon displays when the air tempera-
ture sensor in the wireless remote controller is the sen-
sor being used by the indoor unit. When this function
is off, the indoor unit uses a built-in sensor.
• Fan speed. Displays the current fan speed.
Operating Instruction
Batteries
1. Remove battery cover from back of remote.
2. Insert batteries into battery compartment.
3. Replace cover on controller.
NOTE: ON/OFF Timer, setpoint, fan speed and all other
functions will have to be reset wheneverthe batteries
are completely discharged or are replaced.
Select Fahrenheit or Celsius
Press and hold the Up and Down buttons at the same
time for three seconds to toggle between Fahrenheit and
Celsius.
NOTE: To Set the Operation Mode
Press the Mode button to scroll through the mode selections.
• Auto — System operates in cooling or heating mode as
determined by the setpoint and the room temperature.
• Cool — System operates in cooling mode.
• Dry — System removes humidity according to preset
conditions (fan speed and setpoint temperature, not a
humidistat sensor). Cannot adjust fan speed.
• Heat — System operates in heating mode.
• Fan — This is for Fan only, no heating or cooling.
To set (or change) the room temperature setting
(setpoint)
Press the up and down arrow buttons to adjust the setpoint.
Auto Mode
1. Press the Power button, an LED light on the indoor unit
displays.
2. Press the Mode button until the display shows AUTO.
3. Adjust temperature setpoint using up and down arrow
buttons (range 62°F — 86°F).
NOTE: Fan speed is auto and is not adjustable.
Cool/Heat/Fan mode
1. Press the Mode button to select Cool, Heat, or Fan.
2. Adjust the temperature setpoint using up and down
arrow buttons (range 62°F — 86°F).
3. Press the Fan Speed button to select Auto, Low,
Med, or High fan speed.
NOTE: Temperature set point is not displayed in Fan mode.
Dry Mode
1. Press the Power button. An LED light on the indoor unit
displays.
2. Press the Mode button to select Dry.
3. Adjust the temperature set point using up and down
arrow buttons.
NOTE: Fan speed is not adjustable in dry mode. Using dry
mode will over shoot the set point by 6 - 8 degrees.
There is no humidity sensor.
R
Timer Operation Troubleshooting
Timer ON and Timer OFF are used to turn on and turn off
the indoor unit at selected intervals.
Timer ON Operation
1. Press the Timer ON button. The Timer ON icon, the last
auto -on time, and "h" will display.
2. Press the Timer ON button again to set the amount
of time before the indoor unit begins operation. Each
press will increase the time in half hour increments
until 10 hours, then the increment becomes 1 hour.
Timer OFF Operation
1. Press the Timer OFF button. The Timer OFF icon, the
last auto -off time, and "h" will display.
2. Press the Timer OFF button again to set the amount of
time before the indoor unit stops operation. Each press
will increase the time in half hour increments until 10
hours, then the increment becomes 1 hour.
Modify Timer ON/OFF settings
1. Press either the Timer ON button or the Timer OFF
button to modify that setting.
2. Use the up arrow and down arrow buttons to change
the timed operation intervals.
3. Set the timer to 0.0 to turn off timed operation.
If any of the following faults codes appear on your indoor
unit, please contact your licensed professional HVAC
installer (or equivalent) or a service agency.
Table 4. Faults Codes Displayed on Indoor Unit
Code
Description
EO
Indoor unit EEPROM error
E1
Communication error between indoor unit and outdoor
unit
E3
Indoor fan speed error
E4
Indoor return air temperature sensor error
E5
Indoor coil temperature sensor error
EC
Low refrigerant
EE
High water level alarm
FO
Outdoor current overload sensed
F1
Outdoor ambient temperature sensor error
F2
Outdoor coil temperature sensor error
F3
Compressor discharge temperature sensor error
F4
Outdoor unit EEPROM error
F5
Outdoor unit fan speed error
PO
Inverter module IPM error
P1
High or low voltage protection
P3
Outdoor unit low temperature lockout
P4
Compressor drive error
P6
Compressor high-pressure or low-pressure switch
open
7
FCC Compliance Statement — PART 15.19
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received,
including interference that may cause undesired
operation.