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BLD2022-1633_Manufacturer_Specifications_and_Installation_Instructions_11.29.2022_12.15.55_PM_3242068LENNOX ©2018 Lennox Industries Inc. Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE 6"t94aM4=1iIIki"9:141111J►1III Iliffell TF=I - NOTES See NOTES NOTES T CONTROL See NOTES BOX / INSTALLATION INSTRUCTIONS Merit° Series 16ACX Units AIR CONDITIONER 507875-01 8/2018 General This 16ACX outdoor air conditioner is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. See the Len- nox 16ACX Product Specifications bulletin (EHB) for ap- proved indoor component match ups. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. NOTICE! Charging information is given on the charging procedure sticker on the unit access panel. For more in-depth information, consult the Installation and Service Procedures manual, available on LennoxPros.com or through the Technical Support department at 800-453-6669. NOTES - Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box. Clearance to one of the other three sides must be 36 in. (914 mm). Clearance to one of the remaining two sides may be 12 in. (305 mm) and the final side may be 6 in. (152 mm). A clearance of 24 in. must be maintained between two units. 48 in. (1219 mm) clearance required on top of unit. Page 1 co w 0 507875-01 UNIT DIMENSIONS - INCHES (MM) 140— A­4PH B SIDE VIEW Li FIGURE 1 TABLE 1 — Unit Dimensions Model Numbers A B 16ACX-024 28-1/4 (718) 42-1/4 (845) 16ACX-036 28-1/4 (718) 28-1/2 (724) 16ACX-048 28-1/4 (718) 36-1/2 (927) 16ACX-060 32-1/4 (819) 42-1/4 (1073) STEP 1 — SETTING THE UNIT (Continued) — Unit Placement NOTICE! Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface. PLACEMENT INSTALL UNIT AWAY I FROM WINDOWS O 90o ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION FIGURE 2 SLAB MOUNTING Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure. BUILDING STRUCTURE DISCHARGE AIR JI i MOUNTING SLAB GROUND LEVEL FIGURE 3 NOTE - An optional Unit Stand -Off Kit (94J45) is available for this unit. Black high -density polyethylene feet raise unit off of mounting surface away from damaging moisture. Four feet are furnished per order number. Page 2 STEP 2 — REFRIGERANT PIPING — Flushing Existing Line Set and Indoor Coil A IMPORTANT If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device and reduce system performance and capacity. Failure to properly flush the system per this instruction and the detailed Installation and Service Procedures manual will void the warranty. Flush the existing line set per the following instruc- tions. For more information, refer to the Installation and Service Procedures manual available on Lennox- Pros.com. CAUTION - DO NOT attempt to flush and re- use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out). If a new line set is being installed, size the piping per table 2. NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrica- tion Guidelines manual available on LennoxPros.com (Corp. 9351-L9), or contact the Technical Support Depart- ment Product Application group for assistance. NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4). TABLE 2 REFRIGERANT LINE SET — INCHES (MM) Field Recommended Line Set Model Connections Liquid Suction Liquid Suction L15 Line Set Line Line Line Line -024 3/8" 3/4" 3/8" 3/4" L15-41: 15 ft.-50 ft. (10 mm) (19 mm) (10 mm) (19 mm) (4.6 m-15 m) -036 3/8" (10mm) 7/8" (22mm) 3/8" (10mm) 7/8" (22 mm) L15-65: 15 ft.— 50 ft. (4.6 m-15 m) -048 -060 3/8" 1-1/8" 3/8" 1-1/8" Field -Fabricated (10mm) (29 mm) (10mm) (29 mm) NOTE - Some applications may require a field -provided 7/8" to 1-1/8" adapter. Page 3 STEP 2 — REFRIGERANT PIPING — Removing Existing Indoor Metering Device ATYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE OR PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) 1B DISTRIBUTOR TUBES j LIQUID LINE ORIFICE HOUSING TEFLONO RING / FIXED ORIFICE •r �� T\ BRASS NUT DISTRIBUTOR - ASSEMBLY �/ 1 REMOVE AND DISCARD WHITE TEFLONO SEAL (IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION DISTRIBUTOR HOUSING VALVE TUBES TEFLOP _ RING A - On fully cased coils, remove the coil access and plumbing panels. B - Remove any shipping clamps from the liquid line and distributor as- sembly. C - Using two wrenches, disconnect liquid line from liquid line orifice hous- ing. Take care not to twist or damage distributor tubes during this pro- cess. D - Remove and discard fixed orifice, valve stem assembly (if present) and Teflon® washer as illustrated above. TEFLON@ \ ® RING SENSING �\ LINE Ji \ DISTRIBUTOR/ EQUALIZER ASSEMBLY/ LINE LIQUID LINE / ASSEMBLY WITH / BRASS NUT o I MALE EQUALIZER / LINE FITTING VAPOR SENSING BULB LINE LIQUID LINE A - On fully cased coils, remove the coil access a d plumbing panels. B - Remove any shipping clamps from the liquid line and distributor assembly E - Use a field -provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. C - Disconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line. D - Remove the vapor line sensing bulb. CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE 2 E - Disconnect the liquid line from the check expansion valve at the liquid line assembly. CYLINDER CONTAINING GAUGE CLEAN TO BE F - Disconnect the check expansion valve from the liquid line orifice FOR MANIFOLD / USED FOR FLUSHING housing. Take care not to twist or damage distributor tubes during g� g g (Positioned to deliver liquid this process. A refrigerant) G - Remove and discard check expansion valve and the two Teflon® LOW i HIGH rings. I H - Use a field -provided fitting to temporarily reconnect the liquid line to VAPOR LINE NEW 0 the indoor unit's liquid line orifice housing. SERVICE VALVEOUTDOOR \ UNIT FLUSHING LINE SET OPENED CLOSED The line set and indoor unit coil must be flushed with at least the same ZEXISTIN'1� OO amount of clean refri erant that reviousl char ed the s stem. Check 9 P Y 9 YIT B the charge in the flushing cylinder before proceeding. LIQUID LINE SERVICE A- Set the recovery machine for liquid recovery and start the recovery VALVE machine. Open the gauge set valves to allow the recovery RECOVErX machine to pull a vacuum on the existing system line set and indoor CYLINDETANK unit coil. RETURN \ C B - Position the cylinder of clean HCFC-22 for delivery of liquid INLET D refrigerant and open its valve to allow liquid refrigerant to flow into DISCHARGE the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit RECOVERY MACHINE coil before it enters the recovery machine. C - After all of the liquid refrigerant has been recovered, switch the A- HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid recovery machine to vapor recovery so that all of the HCFC-22 refrigerant) to the vapor service valve. vapor is recovered. Allow the recovery machine to pull the system B - HCFC-22 gauge set (low side) to the liquid line valve. down to 0. C - HCFC-22 gauge set center port to inlet on the recovery machine with an D - Close the valve on the inverted HCFC-22 drum and the gauge set empty recovery tank connected to the gauge set. valves. Pump the remaining refrigerant out of the recovery D- Connect recovery tank to recovery machine per machine instructions. machine and turn the machine off. FIGURE 4 Page 4 STEP 2 — REFRIGERANT PIPING — Brazing Procedures 1 CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round. Do not crimp end of the line. CUT AND DEBUR 0 LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPER TUBE STUB j REDUCER O O 1 LINE SET SIZE IS SMALLER THAN CONNECTION REFRIGERANT LINE 2 CAP AND CORE REMOVAL Remove service cap and core from both the vapor and liquid line service ports. SERVICE PORT CAP ci "r SERVICE PORT CORE SERVICE PORT CORE SERVICE PORT CAP LIQUID LINE SERVICE VAPOR LINE SERVICE 1\ VALVE VALVE DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION 3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND VAPOR LINE SERVICE VALVES Flow regulated nitrogen (at 1 to 2 psig) through the low -side refrigeration gauge set into the liquid line service port valve, and out of the vapor line service port valve. A - Connect gauge set low pressure side to liquid line service valve (service port). B - Connect gauge set center port to bottle of LOW nitrogen with regulator. . C - Remove core from valve in vapor line service port to allow nitrogen to escape. ATTACH GAUGES VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN VAPOR LINE INDOOR UNIT LIQUID LINE QVAPOR LINE SERVICE j VALVE HIGH USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG. O OUTDOOR UNIT NITROGEN LIQUID LINE SERVICE O WHEN BRAZING LINE SET TO VALVE SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. FIGURE 5 Page 5 4 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water -saturated cloths around service valve bodies and copper tube stubs. Use additional water -saturated cloths underneath the valve body to protect the base paint. 5 FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port. See steps 3A, 313 and 3C on manifold gauge set connections. 6 BRAZE LINE SET Wrap both service valves with water -saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Cloths must remain water -saturated throughout the brazing and cool -down process. LIQUID LINE SERVICE VALVE WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. IMPORTANT — Allow braze joint to cool. Apply additional water -saturated cloths to help cool brazed joint. Do not remove water -saturated cloths until piping has cooled. Temperatures above 250°F will damage valve seals. MA WARNING FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE may result if you do not wrap a water -saturated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing the line set! The braze, when complete, must be quenched with water to absorb any residual heat. • Do not open service valves until refrigerant lines and indoorcoil have been leak -tested and evacuated. Refer .I to Installation and Service Procedures manual found on LennoxPros.com. Zlf VAPOR LINE WATER -SATURATED CLOTH LIQUID LINE VAPOR LINE SERVICE VALVE WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. WATER -SATURATED CLOTH 7 PREPARATION FOR NEXT STEP After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water -saturated cloths to both services valves to cool piping. Once piping is cool, remove all water -saturated cloths. FIGURE 6 Page 6 STEP 2 — REFRIGERANT PIPING — Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device. See the 16ACX Product Specifications bulletin (EHB) for approved expansion valve kit matchups. The expansion valve can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field -provided plenum, install the expansion valve in a manner that will provide access for field servicing of the expansion valve. Refer to following illustration for reference during installation of expansion valve. INDOOR EXPANSION VALVE INSTALLATION O 1/2 Turn 3 - Install one of the provided Teflon rings around the l TWO PIECE stubbed end of the check expansion valve and lightly 1 PATCH PLATE (Uncased Coil Shown) lubricate the connector threads and expose surface of 10 (UNCASED COIL ONLY) LIQUID LINE STUB the Teflon® ring with refrigerant oil. q ORIFICE END EXPANSION ON 4- Attach the stubbed end of the check expansion valve to 8 5 4 HOUSING DISTRIBUTOR VALVE the liquid line orifice housing. Finger tighten and use an TUBES appropriately sized wrench to turn an additional 1/2 turn I� TEFLON® clockwise as illustrated in the figure above, or tighten to o RING 20 ft-lb. o 0 4 D' 5 - Place the remaining Teflon® washer around the other end of the check expansion valve. Lightly lubricate TEFLON®, connector threads and expose surface of the Teflon° SENSING RING LINE ring with refrigerant oil. 6 - Attach the liquid line assembly to the check expansion valve. Finger tighten and use an appropriately sized DISTRIBUTOR EQUALIZER wrench to turn an additional 1/2 turn clockwise as ASSEMBLY c LINE illustrated in the figure above or tighten to 20 ft-lb. LIQUID LINE/ SENSING BULB INSTALLATION ASSEMBLY WITH 1 - Attach the vapor line sensing bulb in the proper / BRASS NUT orientation as illustrated to the right using the clamp and o screws provided. MALE EQUALIZER LINE VAPOR \ FITTING (SEE LINE EQUALIZER LINE INSTALLATION FOR LIQUID LINE FURTHER DETAILS) Sensing bulb insulation is required if mounted external to the coil casing. sensing bulb installation for bulb positioning. EQUALIZER LINE INSTALLATION NOTE - Though it is preferred to have the sensing bulb 1 /8 Turn installed on a horizontal run of the vapor line, installation on a vertical run of piping is acceptable if necessary. l� 1 NOTE -Confirm proper thermal contact between vapor 10 Q line and check/expansion bulb before insulating the 9 1� sensing bulb once installed. 4 8 7 5 2 - Connect the equalizer line from the check expansion 6 valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below. 1 - Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure below. 2 - Remove the field -provided fitting that temporarily recon- nected the liquid line to the indoor unit's distributor as- sembly. FLARE SEAL CAP FLARE NUT X_ COPPER FLARE OR SEAL BONNET MALE BRASS EQUALIZER LINE FITTING VAPOR LINE VAPOR LINE. VAPOR LINE FIGURE 7 ( BUL ON LINES SMALLER THAN 7/8", MOUNT SENSING ULB AT EITHER THE 3 OR O'CLOCK POSITION. DN 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O'CLOCK DOSITION. NOTE - NEVER MOUNT THE SENSING BULB ON BOTTOM OF LINE. Page 7 STEP 3 - LEAK TEST AND EVACUATION LEAK TEST LOW HIGH MANIFOLD GAUGE SET O OUTDOOR UNIT 1 0 B t TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A 1 CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. B -With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container. 2 TEST FOR LEAKS After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks: A -With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only). B -Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. (A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure.] Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder. C -Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set. D -Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit. E -After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector. F - After leak testing, disconnect gauges from service ports. FIGURE 8 Page 8 EVACUATION 3CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in -line tee to vapor line service valve B - Connect high side of manifold gauge set to liquid line service valve C - Connect available micron gauge connector on the 1/4 SAE in -line tee. D - Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set. The center port line will be used later for both the HFC-410A and nitrogen containers. NOTE - Position can- ister to deliver liquid NITROGEN refrigerant. OUTDOOR UNIT A / HFC-410A J"'° B VACUUM PUMP 4 EVACUATE THE SYSTEM LOW / ) HIGH MANIFOLD 1/4 SAE TEE WITH SWIVEL GAUGE SET COUPLER soo C ra tiraw� MICRON GAUGE 1 TO VAPOR SERVICE VALVE 0 TO LIQUID LINE SERVICE VALVE 1 t RECOMMEND MINIMUM 3/8" HOSE A- Open both manifold valves and start the vacuum pump. B - Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure. C D E F G NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following: • Close manifold gauge valves. • Close valve on vacuum pump. • Turn off vacuum pump. • Disconnect manifold gauge center port hose from vacuum pump. • Attach manifold center port hose to a nitrogen cylinder with pressure regulatorset to 150 psig (1034 kPa) and purge the hose. • Open manifold gauge valves to break the vacuum in the line set and indoor unit. • Close manifold gauge valves. Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the nitrogen from the line set and indoor unit. Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump and closing the manifold gauge valves. When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a cylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit. Perform the following: 1/6 TURN • Close manifold gauge valves. • Shut off HFC-410A cylinder. • Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure. • Replace stem caps and finger tighten them, then tighten an additional one -sixth (1/6) of a turn as illustrated. 60 FIGURE 9 Page 9 STEP 4 — ELECTRICAL — Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, A WARNING wiring must conform with current local codes and the cur- Fire Hazard. Use of aluminum wire with this product may rent Canadian Electrical Code (CEC). propertyresult in a fire, causing damage, Refer to the furnace or air handler installation instructions or death. - copper wire only with this product. for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size. 24VAC TRANSFORMER Use the transformer provided with the furnace or air han- dler for low -voltage control power (24VAC - 40 VA mini- mum) 1 SIZE CIRCUIT AND INSTALL SERVICE DISCONNECT SWITCH Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch. MAIN FUSE BOX/ BREAKER PANEL SERVICE DISCONNECT SWITCH NOTE - Units are approved for use only with copper conductors. Ground unit at disconnect switch or connect to an earth ground. 2 INSTALL THERMOSTAT Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight or drafts. THERM NOTE - 24VAC, Class 11 circuit connections are made in the control panel. FIGURE 10 Page 10 UNIT LOW VOLTAGE CONNECTIONS CUTOUT WITH GROMMET 24V CONTROL WIRES TIGHTEN WIRE TIE HIGH VOLTAGE FIELD WIRING FACTORY WIRING — — — — — LOW VOLTAGE (24V) FIELD WIRING WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING MORE THAN 100' (30 METERS) 16 35°C MINIMUM. A. Run 24VAC control wires through cutout with grommet. B. Run 24VAC control wires through wire tie. C. Make 24VAC control wire connections using field -provided wire nuts. D. Tighten wire tie to security 24V control wiring. NOTE- FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRES) GAUGE PER TABLE ABOVE. NOTE - WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND MAINTAINS SEPARATION OF FIELD -INSTALLED LOW -AND HIGH -VOLTAGE CIRCUITS. NOTE - DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL BOX. FIGURE 11 24VAC Control Wiring Diagrams (Field Installed) EL280, EL295, EL296 COMFORTSENSE FURNACE 7500 STAT R 0 O 2 --- WI --- 1 16ACX O LLOV -- Y1 --- 1 BLUE Y2 OPTIONAL OUTDOOR SENSOR C1) O X2658 CUT W914 R TO DS T JII JUMPER WHEN STAT T — J DEHUMID. IS USED. CBA27 BLOWER COMFORTSENSE R — — — COIL 3000 STAT i Q R — — R 16AC Q 2 RED ❑ 3 0 16ACX w1 — — w BRo Q ❑ Dw YELLOV BLUE BLUE Y2 jr BLACK— — C BLACC — — C — — — 0 Air handler shipped with jumpers installed between W1 and W2 and W2 and W3. 11 R connection required for air conditioner with LSOM. Resistor kit (CAT #47W97) required when connection ComfortSense 7000 with LSOM 2. AL connection wired on units with LSOM QRemove jumper for 2-stage cooling. Q Clip onboard Y1 to Y2 for 2-stage cooling. SLP98, S1_28UH, SL280DF COMFORTSENSE FURNACE 7500 STAT R — — — R ❑H O 16ACX E O © QYELLOV BLUE Y2 — — O.D. SENSOR OPTIONAL XX26558 DH OB (p pI CUT W914 R TO DS T J JUMPER WHEN STAT J DEHUMID. IS USED. T CBA38MV COMFORTSENSE BLOWER COIL 7500 STAT R O 1 O — L 1 O.D. G SENSOR OPTIONAL D /X22^6^5`8 O T JI T —J NOTE - Refer to furnace, blower coil and accessory instructions for additional wiring configurations with other optional controls. FIGURE 12. Typical Control Wiring Page 11 B4 OUTDOOR FAN O O SCAPACTART ITORGROUND LUG LUG K1 K31 COMPRESSOF 2 O POTENTIAL CONTACTOR RELAY O 1 5 (OPTIONAL) Q /T'� C12 Uj L J F C DUAL CAPACITOR 1-0 S87 LOW PRESSURE COMPRESSOR© SWITCH HI © O HIGH PRESSURE ® L34 SWITCH K1-1 COMPRESSOR CONTACTOR S11 L1 �ii .O S40 TIS K31 ML195, ML193 INDOOR ML180/ML180E UNIT THERMOSTAT TB1 A2 R R W G G YELL Y Y BLUE BLAB C C EL195E INDOOR THERMOSTAT UNIT TB1 � R R W1 W2 G G YELLOW Y1 1 BLUE - Y2 BUCK r C C OE SLP98V,SL280V INDOOR UNITA92 THERMOSTAT ®TB1 W914 DS D R R O (D W95 W1 W2 G G YELL BLUE Y1 V2 BLACK C C Q NOTE - FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT RATING PLATE ® FOR MINIMUM CIRCUIT AMPACITY AND D4 MAXIMUM OVERCURRENT PROTECTION SIZE 54 © REFER TO COMPRESSOR IN UNIT FOR YELLOW ACTUAL TERMINAL ARRANGEMENT V1 J MOTOR BLUE0. Y2 © WARNING - ELECTRIC 587 ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY BLACK OR DEATH.UNIT MUST BE GROUNDED IN ACCORDANCE C WITH NATIONAL AND LOCAL CODES. K1 BLUE CBX40UHV, CSX32MV REMOVE JUMPER FOR TWO STAGE COOL ELLO w z 0 N ® 1 � � w O ® a m m O z CBX32M 4a INDOOR O ¢ H Y w C7 UNIT THERMOSTAT TB7 A2 HR1 RED C F c� w C12 DUAL R R CAPACITOR 4V3 O W2 L2 W1 EQUIPMENT GROUND 1 YELLOW BLUE BLACK C a INDOOR UNIT THERMOSTAT ® ON A92 CUT ONBOARD W914 JUMPER FROM IDS TB TO R, WHEN HUMIDITY CONTROL IS USED R R ® ON A92 DO NOT CUT ONBOARD W951 JUMPER Qq W3 FROM R TO O. IT IS USED FOR APPLICATIONS FOR CONDENSING UNITS W2 a FOR CONDENSING UNIT APPLICATIONS USE RTO 0 JUMPER. REMOVE IN HEAT PUMP APPLICATIONS W7 e N G REMOVE IDS TO Y1 JUMPER WHEN HUMIDITY G CONTROL IS USED ® WHEN TWO STAGE THERMOSTAT IS USED, CONNECT O SECOND STAGE HEAT BULB TO TERMINAL -W2-, AND DS D REMOVE JUMPER BETWEEN "R"AND"W2" ® L34 SOLENOID IS LOCATED IN COMPRESSOR. O Q COIL IS 24VDC. DO NOT CONNECT 24VAC TO COIL TERMINALS YELLOW • V1 ® BLUE S11 IS OPTIONAL LOW AMBIENT SWITCH • V2 ® OPTIONAL HARD START KIT MAY BE REQUIRED BLACK ON APPLICATIONS WHERE VOLTAGES ARE LESS THAN C C 230 VOLT KIT ICLUDES K31 AND C7 WITH ALL NECESSARY WIRING. ® S40 AND HRI ARE USED ON 048 AND 060 UNITS ONLY NOTE - IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING, INSULATION THICKNESS, AND TERMINATION. NOTE -MINIMUM TRANSFORMER REQUIRED IN INDOOR UNIT-40 VA LINE VOLTAGE FIELD INSTALLED CLASS II VOLTAGE FIELD WIRING DENOTES OPTIONAL COMPONENTS LENNOX COOLING - CONDENSING 16ACX-024-230 16ACX-060-230 16ACX-036-230 16ACX-048-230 uverseaes a Form No. 53801515-01 FIGURE 13. Typical Field Wiring Page 12 Charging The 16ACX unit is factory -charged with enough HFC-410A refrigerant to accommodate a 15-foot length of refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access panel. Detailed information is given in the 16ACX Installation and Service Procedures manual, which is available on LennoxPros.com. Field Operation Checklist for Two -Stage Modulation Compressors Unit Readings Y1 - First -Stage Expected results during Y2 demand (Toggle switch On) COMPRESSOR Voltage Same Amperage Higher Same or Higher OUTDOOR UNIT FAN MOTOR Amperage TEMPERATURE Ambient Same Outdoor Coil Discharge Air Higher Compressor Discharge Line Higher Indoor Return Air Same Indoor Coil Discharge Air Lower PRESSURES Suction (Vapor) Lower Liquid Higher Use the checklist procedure above to verify part -load and full -load capacity operation of two -stage modulation com- pressors. TOOLS REQUIRED • Refrigeration gauge set • Digital volt/amp meter • Electronic temperature thermometer • On -off toggle switch Y2 - Second -Stage Page 13 Start -Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature:— Return Air: Temperature: System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach temperatures.) Subcooling: A — B = SUBCOOLING Saturated Condensing Temperature (A) minus Liquid Line Temperature (B) Approach: A — B = APPROACH Liquid Line Temperature (A) minus Outdoor Air Temperature (B) Indoor Coil Temperature Drop (18 to 22°F) A — B = COIL TEMP DROP Return Air Temperature (A) minus Supply Air Temperature (B) HIGH-PRESSURE SWITCH This unit is equipped with a high-pressure switch which is located on the liquid line. The SPST, normally closed pres- sure switch opens when liquid line pressure rises above the factory setting of 590 + 15 psig and automatically resets at 418 ± 15 psig. Aomeowner Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch. In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked air- flow prevent your unit from operating at its most efficient level. The system should be inspected and serviced be- fore each cooling and heating season by a licensed pro- fessional HVAC service technician (or equivalent). Homeowner Maintenance The following maintenance may be performed by the homeowner. • Contact a licensed professional HVAC technician to schedule inspection and maintenance appointments for your equipment before each heating and cooling season. • Check the indoor unit filter each month and replace the filter, if necessary. • Have your Lennox dealer show you where your indoor unit filter is located. It will be either at the indoor unit (in- stalled internal or external to the cabinet) or behind a re- turn air grille in the wall or ceiling. Check the filter month- ly and clean or replace it as needed. Disposable filters should be replaced with a filter of the same type and size. • Check the indoor unit drain line for obstructions month- ly. The indoor coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the loca- tion of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.) Page 14 • Check the area around the outdoor unit monthly and remove any obstructions that may restrict airflow to the outdoor unit. This would include grass clippings, leaves, or papers that may have settled around the unit. • Trim shrubbery away from the unit and periodically check for debris which collects around the unit. • During the winter months, keep the snow level below the louvered panels. NOTE - The filter and all access panels must be in place any time the unit is in operation. If you are unsure about the filter required for your system, call your Lennox dealer for assistance. A IMPORTANT Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of the steel and aluminum parts, diminish performance and affect longevity of the unit. Thermostat Operation See the thermostat homeowner manual for instructions on how to operate your thermostat. Pre -Service Check If your system fails to operate, check the following before calling for service: • Verify room thermostat settings are correct. • Verify that all electrical disconnect switches are ON. • Check for any blown fuses or tripped circuit breakers. • Verify unit access panels are in place. • Verify air filter is clean. If service is needed, locate and write down the unit model number and have it handy before calling. Professional Maintenance Your heating and air conditioning system should be in- spected and maintained twice each year (before the start of the cooling and heating seasons) by a licensed profes- sional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC techni- cian. Outdoor Unit 1 - Inspect component wiring for loose, worn or damaged connections. Also check for any rubbing or pinching of wires. Confirm proper voltage plus amperage of outdoor unit. 2 - Check the cleanliness of outdoor fan and blade condition (cracks) and clean or replace them, if necessary. 3 - Inspect base pan drains for debris and clean as necessary. 4 - Inspect the condition of refrigerant piping and confirm that pipes are not rubbing copper -to - copper. Also, check the condition of the insulation on the refrigerant lines. Repair, correct, or replace as necessary. 5 - Test capacitor. Replace as necessary. 6 - Inspect contactor contacts for pitting or burn marks. Replace as necessary. 7 - Check outdoor fan motor for worn bearings/ bushings. Replace as necessary. 8 - Inspect and clean outdoor coils, if necessary and note any damage to coils or signs of leakage. Indoor Unit (Air Handler or Furnace) 1 - Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus amperage of indoor unit. 2 - Inspect and clean or replace air filters in indoor unit. 3 - Check the cleanliness of indoor blower and clean blower, if necessary. 4 - Inspect the indoor coil drain pans and condensate drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from the pan through to the outlet of the pipe. Clean or replace as necessary. 5 - Inspect and clean indoor coil, if necessary. 6 - Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper -to - copper. Also, ensure that refrigerant pipes are not being affected by indoor air contamination. Check condition of insulation on the refrigerant lines. Repair, correct, or replace as necessary. 7 - Inspect the duct system for leaks or other problems. Repair or replace as necessary. 8 - Check for bearing/bushing wear on indoor blower motor. Replace as necessary. 9 - If your unit is matched with a gas- or oil -fired furnace, indoor unit service will also include inspection and cleaning of the burners, and a full inspection of the gas valve, heat exchanger and flue (exhaust) system. General System Test with System Operating 1 - Your technician should perform a general system test. He will turn on the air conditioner to check operating functions such as the startup and shutoff operation. He will also check for unusual noises or odors, and measure indoor/outdoor temperatures and system pressures as needed. He will check the refrigerant charge per the charging sticker information on the outdoor unit. 2 - Verify that system total static pressure and airflow settings are within specific operating parameters. 3 - Verify correct temperature drop across indoor coil. Page 15