Westinghouse WHM24DMA21S Service Manual
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Westinghouse WHM24DMA21S Service Manual

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AIR CONDITIONER
Duct type
INDOOR
OUTDOOR
, WESTINGHOUSE, and INNOVATION YOU CAN BE SURE OF are trademarks of Westing house
Electric Corporation. Used under license by FUJITSU GENERAL AMERICA, INC. All Rights Reserved.
SERVICE MANUAL
WHM24DMA21S
WHM36DMA21S
WHM24SZA21S
WHM48DMA21S
WHM60DMA21S
WHM36SZA21S
R410A
REFRIGERANT
INVERTER
WHM48SZA21S
WHM60SZA21S
2021.12.14

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  • Page 1 SERVICE MANUAL INDOOR WHM24DMA21S WHM48DMA21S WHM36DMA21S WHM60DMA21S OUTDOOR WHM24SZA21S WHM36SZA21S WHM48SZA21S WHM60SZA21S , WESTINGHOUSE, and INNOVATION YOU CAN BE SURE OF are trademarks of Westing house Electric Corporation. Used under license by FUJITSU GENERAL AMERICA, INC. All Rights Reserved. 2021.12.14...
  • Page 2 Notices: • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. SAFETY SUMMARY IMPORTANT NOTICE ● We pursue a policy of continuing improvement in design and performance of products. The right is therefore reserved to vary specifications without notice.
  • Page 3 ● Do not use any sprays such as insecticide, lacquer, hair spray or other flammable gases within approximately one (1) meter from the system. ● If circuit breaker or fuse is often activated, stop the system and contact your service contractor. ●...

  • Page 4: Specifications

    Specifications Duct Type Inverter heat pump Model name WHM24DMA21S WHM36DMA21S WHM48DMA21S WHM60DMA21S Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 198—253 V 7.03 10.56 14.07 16.41 Rated Btu/h 24,000 36,000 48,000 56,000 Cooling 2.23—7.33...
  • Page 5 Type Inverter heat pump Model name WHM24SZA21S WHM36SZA21S WHM48SZA21S WHM60SZA21S Power supply 208/230 V ~ 60 Hz Available voltage range 198—253 V Airflow rate 1,825 (3,150) 2,350 (3,995) 3,525 (6,000) CFM (m Type × Q'ty Propeller fan × 1 Propeller fan × 2 Motor output dB (A) Sound pressure level *...
  • Page 6 Dimensions Models: WHM24DMA21S and WHM36DMA21S Unit: in (mm) Air outlet 2 (51) Electric box Gas pipe Liquid pipe Drain pipe 3-1/4 (81) 1-3/8 (35) 21-5/8 (550) Air inlet 19-5/8 (500) 18 (458) - 5 -...
  • Page 7 Models: WHM48DMA21S and WHM60DMA21S Unit: in (mm) Air outlet 2 (51) Electric box Gas pipe Liquid pipe Drain pipe 3-1/4 (81.5) 1-3/8 (35) 21-5/8 (550) Air inlet 22 (560) 20-3/8 (518) - 6 -...

  • Page 8: Installation Space Requirement

    Installation space requirement Provide sufficient installation space for product safety. • Clearance in the vertical position More than 0 in More than 0 in Front of unit • Clearance in the horizontal position Air inlet Air outlet 40 in or more 40 in or more - 7 -...
  • Page 9 Model: WHM24SZA21S Unit: in (mm) Electric box 12-1/4 (312) Liquid pipe 21-3/8 (542) 6-5/8 (168) 3 (76) 4-7/8 Gas pipe (123) 33-7/8 (860) 4-15/16 (125) 12-1/8 (309) Drain pipe Air inlet 2 (50) 4- 7/16 (11) × 11/16 (17) Hole Air outlet - 8 -...
  • Page 10 Model: WHM36SZA21S Unit: in (mm) Electric box Gas pipe Liquid pipe 2-5/8 6-1/8 7-1/4 (185) 22-7/8 (580) (66) (155) 37-3/8 (950) 3-1/2 (88) 40-7/8 (1,038) 13-9/16 (344) Air inlet Drain pipe 2-3/4(70) 4- Ø5/8 (15) Hole Air outlet - 9 -...
  • Page 11 Models: WHM48SZA21S and WHM60SZA21S Unit: in (mm) Electric box 37-3/8 (950) 3-1/2 Gas pipe Liquid pipe (88) 2-5/8 (66) 6-1/8 (155) 40-7/8 (1,038) 7-1/4 (185) 22-7/8 (580) Drain pipe Air inlet 13-9/16 (344) 4- Ø5/8 (15) Hole Air outlet - 10 -...

  • Page 12: Installation Space

    Installation space Models: WHM24SZA21S, WHM36SZA21S, WHM48SZA21S, and WHM60SZA21S ¢ Space requirement Provide sufficient installation space for product safety. CAUTION Keep the space shown in the installation examples. If the installation is not performed accordingly, it could cause a short circuit and result in a lack of operating performance.

  • Page 13: Refrigerant Circuit

    Refrigerant circuit Models: WHM24SZA21S and WHM36SZA21S Cooling cycle Heating cycle List of components Compressor Discharge temperature sensor 4-way valve Outdoor heat exchanger Coil temperature sensor Ambient temperature sensor Electronic expansion valve Stop valve (Liquid) Stop valve (Gas) One-way valve Strainer Pressure sensor - 12 -...
  • Page 14 Models: WHM48SZA21S and WHM60SZA21S Cooling cycle Heating cycle List of components Compressor Discharge temperature sensor High pressure switch Suction temperature sensor 4-Way valve Pressure sensor Outdoor heat exchanger Ambient temperature sensor Coil temperature sensor Defrost temperature sensor Electronic expansion valve Strainer One-way valve Stop valve (Gas)

  • Page 15: Additional Refrigerant Charge

    Piping work and refrigerant charge Air tight test Do use nitrogen when performing air-tight test. Connect the gauge manifold using charging hoses with a nitrogen cylinder to the check joints of the liquid line and the gas line stop valves. Perform the air-tight test. Don't open the gas line stop valves.
  • Page 16 Checking Components Check Refrigerant System TEST SYSTEM FLOW: Conditions: ① Compressor is running. The air condition should be installed in good ventilation.  Tool: Pressure Gauge Technique: ① see ② feel ③ test See ----- Tube Defrost. Feel ----- The Difference between Tube’s Temperature. Test ----- Test Pressure.
  • Page 17 Heating Mode Test system pressure. Is the high The pressure on the pressure normal at high side. service part ? Recharge refrigerant Remove the back after air purging with The pressure on the panel."see"the the vacuum low side. capillary tube1 and pump.

  • Page 18: Check Parts Unit

    Check Parts Unit 1. Indoor Unit Fan Motor Duct motor model 24K: ZWK702B006073 36K: ZWK702B500026 48K: ZKSD-560-8-50-14 60K: ZKSD-560-8-58 Test in resistance. TOOL: Multimeter. Test the resistance of the main winding. The indoor fan motor fails if the resistance of main winding is 0(short circuit)or∞...
  • Page 19 Filed Setting Static Pressure Setting of indoor unit: Blower DIP Switch S2 Static Pressure Fan Speed Select Speed Setting (W.C.[kPa]) 48K/60K Medium Low 0.18[0.045] 0.24[0.057] 0.28[0.07] (Default setting) Medium 0.25[0.08] 0.4[0.1] 0.4[0.1] Medium High 0.58[0.145] 0.58[0.145] 0.58[0.145] High 0.8[0.2] 0.8[0.2] 0.8[0.2] NOTE: Symbol "...

  • Page 20: Blower Data

    (not less than 350 CFM/Ton). • Airflow based upon air handler unit operates at 230 V with no electric heater kit and no filter. Airflow at 208 V is approximately the same as 230 V. ¢ Model: WHM24DMA21S External static pressure in.H2O [KPa] Fan speed 0.18...
  • Page 21 ¢ Model: WHM48DMA21S External static pressure in.H2O [KPa] Fan speed 0.18 (0.02) (0.045) (0.07) (0.1) (0.12) (0.15) (0.17) (0.20) Tap (2) 1,756 1,701 1,626 1,579 1,520 1,468 1,425 — — — — Default setting 1,799 1,746 1,678 1,634 1,571 1,522 1,449 1,402 —...
  • Page 22 DIP Switch Setting of Outdoor Unit (Optional setting) 1. Turn on all power sources before setting. Without turning on, the switches settings are not refreshed and might be invalid. (24K/36K) 2. Turn off all power sources before setting. Without turning off, the switches settings are not refreshed and might be invalid.(48K/60K) 3.
  • Page 23 Step 4: Open the maintenance panel. Step 5: Switch the dial code (referring to outdoor wiring diagram ) ON position on the main control board. Step 6: Switch on the machine power. Step 7: Check if “40” is displayed on the LED digital tube of the main control board. Step 8: When the numerals on the LED digital tube of outdoor unit count down to 0 (40 →...
  • Page 24 Running parameter query Query by 7 segment display 7 segment display Digital display switch 7-segment display Introduction 24K/36K ● ● ● Decrease Select Increase There are 3 buttons on the digital display board： 1) Select button: Select to display outdoor/indoor unit parameter. "P."...
  • Page 25 Parameters can be checked in the following table below. Parameter Descriptions code Fault codes Compressor actual frequency Compressor driving frequency Compressor target frequency Compressor exhaust temperature Outdoor suction temperature Outdoor ambient temperature Outdoor coil temperature Outdoor defrosting temperature P.10 IPM module temperature P.11 Outdoor capacity requirement P.13...
  • Page 26 48K/60K ● ● ● Decrease Select Increase There are 3 buttons on the digital display board： 1) SWITCH button: Indoor parameters and outdoor parameters can be selected in turn by pressing it. “P.”/“H.”-outdoor unit parameter 2) INCREASE button: Each time it is pressed, the number rises by 1, hold down it, the number will be rapidly increased; 3) DECREASE button：...

  • Page 27: Wiring Diagrams

    Wiring diagrams Models: WHM24DMA21S, WHM36DMA21S, WHM48DMA21S, and WHM60DMA21S *Optional Outdoor Unit Thermostat USE COPPER SUPPLY WIRES (75°C Min) ONLY Electric Heater Thermostat Elec Heater 1 2 3 4 L3 L4 Trans Transformer X4 X6 EC-FAN L2-TRANS L2-FAN L2 L1 L1-FAN L1-TRANS...
  • Page 28 Models: WHM24SZA21S and WHM36SZA21S USE COPPER SUPPLY WIRES DC FAN MOTOR POWER TERMINAL PANEL FG (CN901.1) AC-LIN (CN501) Vsp (CN901.2) AC-NIN (CN502) Vcc (CN901.3) GND (CN901.4) YEL/GRN EARTH (CN503) +310V (CN901.6) +310V EARTH CONNECTION TERMINAL PANEL YEL/GRN X12.4 Control Board X12.3 OPTIONAL X12.2...
  • Page 29 Models: WHM48SZA21S and WHM60SZA21S Power terminal panel IPM BOARD CN12 NIN Nout2 CN11 LIN Lout FILTER CN17 CN18 CN16 CN15 CN14 BOARD EARTH DC FAN1 DC FAN2 FAN2 FAN1 X1 PTC Lout1 Nout1 YLW/GRN RED WHI BLU YLW/GRN USE COPPER SUPPLY WIRES INDUCTOR COMPRESSOR YLW/GRN DC FAN1 MOTOR DC FAN2 MOTOR...

  • Page 30: Troubleshooting

    Troubleshooting Trouble guide Troubleshooting for normal malfunction Troubleshooting Possible Reasons of A bnormality How to Deal With 1. Check power supply circuit; 2. Measure insulation resistance to 1. Power supply failure; ground to see if there is any 2. Trip of breaker or blow of fuse； leakage;...
  • Page 31 Outdoor unit 24K/36K DC-Inverter unitary (Main control board upside-down) 1) Fault code displayed by LED lamps on outdoor main control board. There are 3 LED lamps on control board, LED1, LED2 and LED3. LED1 indicates the ten's place of the fault code, LED2 indicates the unit's place of the fault code and LED3 indicates outdoor drive control fault.
  • Page 32 2) Display by 7 segment display board. Fault code will be displayed directly on 7 segment display board. 48K/60K Main control fault display Fault code will be displayed by 7 segment display on main control board. : Show failure occur. Display ERROR code.

  • Page 33: Fault Codes

    Fault codes The following is the fault code table of outdoor units. Table 1 Outdoor fault code Fault Fault description Possible reasons for abnormality How to deal with Remarks code 1.Reconnect the outdoor 1.The outdoor ambient temperature ambient temperature sensor; Outdoor ambient sensor is connected loosely;...
  • Page 34 Fault Fault description Possible reasons for abnormality How to deal with Remarks code 1. Reconnect the wiring of the 1. The wiring of the overload overload protector; protector is connected loosely. 2. Replace the overload 2. The overload protector fails . protector;...
  • Page 35 Fault Fault description Possible reasons for abnormality How to deal with Remarks code There are many reasons for this failure. You can check the driver board fault LED to further analyze See attached "analysis of the the fault code of the drive board and IPM fault driving board fault".
  • Page 36 NOTE 1: If the indoor unit can not start or the indoor unit stops itself after 30s, at the same time the unit does not display the fault code, please check the fire and the socket of the control board. NOTE 2: If the indoor unit displays the 75,76,77,78 fault code after you turn on the unit, please check the TEST seat of the indoor control board or the TEST detection circuit to see whether short circuit...
  • Page 37 Table 2 Drive fault code (24K/36K) Fault Fault description Possible reasons for abnormality How to deal with code Inverter DC voltage overload fault 1. Power supply input is too high 1. Check power supply； Inverter DC low voltage fault or too low; 2.
  • Page 38 Table 3 Drive fault code (48K/60K) Fault Fault description How to deal with Possible reasons for abnormality code 1. Check the wire of the compressor; 1. Compressor wire is not connected properly; 2. Change the driver board ; 2. Bad driver board components; Q axis current 3.
  • Page 39 Fault Fault description How to deal with Possible reasons for abnormality code 1. Voltage input is too low; 1. Check the power supply. Low DC voltage 200V 2. Drive board fault. 2. Change the driver board. Driver board read EE 1.
  • Page 40 Parts list Indoor unit WHM24DMA21S - 39 -...
  • Page 41 <Refrigerant cycle> - 40 -...
  • Page 42 <Electrical parts> - 41 -...
  • Page 43 Indoor unit WHM24DMA21S Part number Description 2082476 Upper front panel AS 2093922 Seal plate parts 2082481 Down front panel AS 2082496 Mounting plate 2110453 Wing screw 2082470 Upper cover 2108011 Over the wire clip 2115463 Outlet tube assembly 2081573 Inlet tube assembly...
  • Page 44 Indoor unit WHM36DMA21S - 43 -...
  • Page 45 <Refrigerant cycle> - 44 -...
  • Page 46 <Electrical parts> - 45 -...
  • Page 47 Indoor unit WHM36DMA21S Part number Description 2082476 Upper front panel AS 2093922 Seal plate parts 2082481 Down front panel AS 2082496 Mounting plate 2110453 Wing screw 2082470 Upper cover 2108011 Over the wire clip 2081574 Outlet tube assembly 2081573 Inlet tube assembly 2036833 Thermal EV body 2093962...
  • Page 48 Indoor unit WHM48DMA21S - 47 -...
  • Page 49 <Refrigerant cycle> - 48 -...
  • Page 50 <Electrical parts> - 49 -...
  • Page 51 Indoor unit WHM48DMA21S Part number Description 2098536 Upper front panel AS 2093922 Seal plate parts 2098540 Down front panel AS 2098605 Mounting plate 2110453 Wing screw 2098533 Upper cover 2108011 Over the wire clip 2112692 Outlet tube assembly 2152785 Inlet tube assembly 2157986 Thermal EV body 2093962...
  • Page 52 Indoor unit WHM60DMA21S - 51 -...
  • Page 53 <Refrigerant cycle> - 52 -...
  • Page 54 <Electrical parts> - 53 -...
  • Page 55 Indoor unit WHM60DMA21S Part number Description 2098536 Upper front panel AS 2093922 Seal plate parts 2098540 Down front panel AS 2098605 Mounting plate 2110453 Wing screw 2098533 Upper cover 2108011 Over the wire clip 2112692 Outlet tube assembly 2112613 Inlet tube assembly 2113143 Thermal EV body 2093962...
  • Page 56 Outdoor unit WHM24SZA21S <Electrical Parts> 12 13 <Refrigerant Cycle> - 55 -...
  • Page 57 <Refrigerant Cycle> 25 26 - 56 -...
  • Page 58 <Electrical Parts> - 57 -...
  • Page 59 Outdoor unit WHM24SZA21S Part number Description 2006879 Fan guard 2091948 Intake grille 1559520 Propeller fan blade 1859837 DC motor 2119437 Tapping screw 1963835 Motor bracket 1972357 Top panel 1929744 Protective net back 1972622 Clapboard part 1302261 Choke coil 1971724 Cabinet right 1863156 Bracket conduit SA 1854040...
  • Page 60 Outdoor unit WHM36SZA21S - 59 -...
  • Page 61 <Refrigerant cycle> - 60 -...
  • Page 62 <Electrical parts> - 61 -...
  • Page 63 Outdoor unit WHM36SZA21S Part number Description 2118361 Fan guard 2118319 Front panel 1469450 Left guard filter 1382782 Mounting plate 1405350 Propeller fan blade 1421124 Fan motor 1880172 Motor bracket 1908421 Upper cover 1469447 Back guard filter 2023540 Bracket conduit SA 2017891 Bracket conduit 1493224...
  • Page 64 Outdoor unit WHM48SZA21S <Electrical parts> <Refrigerant cycle> - 63 -...
  • Page 65 <Refrigerant cycle> - 64 -...
  • Page 66 <Electrical parts> - 65 -...
  • Page 67 Outdoor unit WHM48SZA21S Part number Description Part number Description 1470773 1465154 Back guard filter EEV coil 1942918 Upper cover 2105689 EEV assembly 1889227 Motor bracket 1465131 1424843 Mounting plate 2031010 Stop valve AS (High) 1470782 Left guard filter 1466345 Valve 3 way 3/8 1421124 Fan motor 2108768...
  • Page 68 Outdoor unit WHM60SZA21S <Electrical parts> <Refrigerant cycle> - 67 -...
  • Page 69 <Refrigerant cycle> - 68 -...
  • Page 70 <Electrical parts> - 69 -...
  • Page 71 Outdoor unit WHM60SZA21S Part number Description Part number Description 1470773 1465154 Back guard filter EEV coil 1942918 Upper cover 2105689 EEV assembly 1889224 Motor bracket 1465131 1424843 Mounting plate 2031010 Stop valve AS (High) 1470782 Left guard filter 1466345 Valve 3 way 3/8 1421124 Fan motor 2108768...
  • Page 72 Accessories Indoor unit Part name Q’ty Part name Q’ty Use and installation instructions Warranty card Outdoor unit Part name Q’ty Part name Q’ty Installation and operation manual Drain hose Rubber cushion - 71 -...

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