Service Manual
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TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CM1972 CM2472 CM3172 FILE NO. Destination: North America DC INVERTER MULTI-SYSTEM AIR CONDITIONER Capacity at 230V 19,700 BTU/h 25,400 BTU/h 30,600 BTU/h Outdoor Model No. Pay special attention when servicing the unit. REFERENCE NO. CM3172 IMPORTANT These air conditioners employ new refrigerant R410A. SM700666-04 CM1972 CM2472 CM3172 Product Code No. 1 852 330 27 1 852 330 28 1 852 330 29 CM1972 CM2472 < Applicable Indoor Units > ●Wall mounted type KMS0772...
TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CM1972 CM2472 CM3172 FILE NO. Destination: North America DC INVERTER MULTI-SYSTEM AIR CONDITIONER Capacity at 230V 19,700 BTU/h 25,400 BTU/h 30,600 BTU/h Outdoor Model No. Pay special attention when servicing the unit. REFERENCE NO. CM3172 IMPORTANT These air conditioners employ new refrigerant R410A. SM700666-04 CM1972 CM2472 CM3172 Product Code No. 1 852 330 27 1 852 330 28 1 852 330 29 CM1972 CM2472 < Applicable Indoor Units > ●Wall mounted type KMS0772...
Service Manual
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... Securely anchor the outdoor unit down with a stove, gas water heater, electric room heater or other heat source, it operates safely and efficiently. Observe all local, state, and national electrical codes. Others CAUTION • Ventilate any moving parts. • Clean up and moving the indoor and outdoor units. When Installing In a Ceiling or Wall Make sure the ceiling/wall is higher than drifting snow. For safe installation and trouble-free operation, you finish...
... Securely anchor the outdoor unit down with a stove, gas water heater, electric room heater or other heat source, it operates safely and efficiently. Observe all local, state, and national electrical codes. Others CAUTION • Ventilate any moving parts. • Clean up and moving the indoor and outdoor units. When Installing In a Ceiling or Wall Make sure the ceiling/wall is higher than drifting snow. For safe installation and trouble-free operation, you finish...
Service Manual
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...this manual. Outdoor air temp. 95°F D.B./ 75°F W.B. 6 Unit Specifications Outdoor Unit CM1972 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount...
...this manual. Outdoor air temp. 95°F D.B./ 75°F W.B. 6 Unit Specifications Outdoor Unit CM1972 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount...
Service Manual
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... shown in this manual. Outdoor Unit CM1972 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High...
... shown in this manual. Outdoor Unit CM1972 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High...
Service Manual
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... unit combination. Outdoor Unit CM2472 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool...
... unit combination. Outdoor Unit CM2472 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool...
Service Manual
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... unit combination. Outdoor Unit CM2472 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool...
... unit combination. Outdoor Unit CM2472 Indoor Unit KMS0972 × 3 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool...
Service Manual
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...× 4 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool Refrigerant Tubing Connections Max. Rating conditions are...
...× 4 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool Refrigerant Tubing Connections Max. Rating conditions are...
Service Manual
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... × 4 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool Refrigerant Tubing Connections Max. Outdoor air temp. 95...
... × 4 Type Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating Performance Electrical Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity BTU/h kW BTU/h BTU/h ft3/min (m3/h) V A W % BTU/h/W BTU/Wh A A Features Control Fan Speeds Compressor Refrigerant / Amount charged at shipment Refrigerant Control Operation Sound (High) Cool Refrigerant Tubing Connections Max. Outdoor air temp. 95...
Service Manual
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... on the indoor unit type. • Check each performance value in test-run mode. Temperature Charts (CM1972) Outdoor Unit CM1972 Indoor Unit KMS0772 × 1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart 188 (1.3) Lo fan 174 (1.2) 160 (1.1) Hi fan HH fan Indoor air temp. 86°F 80°F 75°F (30°C) (27°C) (24°C) Low pressure at wide tube service valve psig...
... on the indoor unit type. • Check each performance value in test-run mode. Temperature Charts (CM1972) Outdoor Unit CM1972 Indoor Unit KMS0772 × 1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart 188 (1.3) Lo fan 174 (1.2) 160 (1.1) Hi fan HH fan Indoor air temp. 86°F 80°F 75°F (30°C) (27°C) (24°C) Low pressure at wide tube service valve psig...
Service Manual
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....6(12) 50.0(10) Indoor air temp. 86°F (30°C) 80°F (27°C) 75°F (24°C) 46.4( 8) 77 86 95 104 (25) (30) (35) (40) Outdoor air temperature °F (°C) NOTE • This performance chart shows operation of 24.6ft (7.5m). The performance chart will vary. 23 If the tubing length is for a tubing length of a single wall-mounted indoor unit.
....6(12) 50.0(10) Indoor air temp. 86°F (30°C) 80°F (27°C) 75°F (24°C) 46.4( 8) 77 86 95 104 (25) (30) (35) (40) Outdoor air temperature °F (°C) NOTE • This performance chart shows operation of 24.6ft (7.5m). The performance chart will vary. 23 If the tubing length is for a tubing length of a single wall-mounted indoor unit.
Service Manual
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...the operation frequency of a compressor is fixed. 38 Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) D.B. / 67 °F (19.4 °C) W.B. : Outdoor Ambient Temp. 95 °F (35 °C) D.B. 2. Outdoor Unit : CM3172 Indoor Unit : KMS0972 × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: INDOOR ENT. D.B. 30,600 BTU/h 65 (18.3) TC 31,170 AIR FLOW RATE: OUTDOOR AMBIENT TEMP....,180 5,240 9,350 13,240 17,350 TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NOTE 1. TEMP. °F (°C) W.B.
...the operation frequency of a compressor is fixed. 38 Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) D.B. / 67 °F (19.4 °C) W.B. : Outdoor Ambient Temp. 95 °F (35 °C) D.B. 2. Outdoor Unit : CM3172 Indoor Unit : KMS0972 × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: INDOOR ENT. D.B. 30,600 BTU/h 65 (18.3) TC 31,170 AIR FLOW RATE: OUTDOOR AMBIENT TEMP....,180 5,240 9,350 13,240 17,350 TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NOTE 1. TEMP. °F (°C) W.B.
Service Manual
Page 54
.... Fan motor trouble (Replace the motor.) Any one of motor rotation speed from the motor to the outdoor unit controller.) Fan motor rotation speed does not change during outdoor unit operation. (Remedy for symptom 3 to 5) It is not possible to measure the voltage again, first turn OFF the outdoor unit power, then, measure the voltage in Test Run mode. [Trouble symptom 1] The fan does not stop approximately 10 seconds after operation is outdoor unit controller trouble or motor trouble. Measurement location (1) Vm...
.... Fan motor trouble (Replace the motor.) Any one of motor rotation speed from the motor to the outdoor unit controller.) Fan motor rotation speed does not change during outdoor unit operation. (Remedy for symptom 3 to 5) It is not possible to measure the voltage again, first turn OFF the outdoor unit power, then, measure the voltage in Test Run mode. [Trouble symptom 1] The fan does not stop approximately 10 seconds after operation is outdoor unit controller trouble or motor trouble. Measurement location (1) Vm...
Service Manual
Page 55
..., and the basic performance of refrigerant with the refrigerant recovery unit. CAUTION Ether-type oil is used for R22. Characteristics of pseudo-non-azeotropic refrigerant mixture. Therefore, do not add new refrigerant. Then, after evacuation, totally recharge the specified amount of the air conditioner will differ depending on whether it is different from the mineral oil used for compressor oil for R410A-type units, which is in gaseous...
..., and the basic performance of refrigerant with the refrigerant recovery unit. CAUTION Ether-type oil is used for R22. Characteristics of pseudo-non-azeotropic refrigerant mixture. Therefore, do not add new refrigerant. Then, after evacuation, totally recharge the specified amount of the air conditioner will differ depending on whether it is different from the mineral oil used for compressor oil for R410A-type units, which is in gaseous...
Service Manual
Page 61
... repairs. Retro-Fitting Existing Systems 9-8-1. Use of Existing Units Never use new refrigerant R410A for existing units which use its existing tubing. Charging Additional Refrigerant 9-7-1. Follow instructions given in this service manual or the installation manual that used . 61 9-7. Only then should you recharge the refrigerant. 9-8. Charge additional refrigerant in a hazardous condition. 9-8-2. Use of Existing Tubing If replacing an older unit that came with a R410A unit, do not use R22. This will cause the air conditioner...
... repairs. Retro-Fitting Existing Systems 9-8-1. Use of Existing Units Never use new refrigerant R410A for existing units which use its existing tubing. Charging Additional Refrigerant 9-7-1. Follow instructions given in this service manual or the installation manual that used . 61 9-7. Only then should you recharge the refrigerant. 9-8. Charge additional refrigerant in a hazardous condition. 9-8-2. Use of Existing Tubing If replacing an older unit that came with a R410A unit, do not use R22. This will cause the air conditioner...
Service Manual
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... Before Starting 2 Model Combinations Combine indoor and outdoor units only as shown in its respective manual. Additional Materials Required for Installation (not supplied) 1-2. COOL/DRY Model This air conditioner uses the new refrigerant R410A. Tools Required for Installation 2. Type of the Flaring Method 3-3. Embedding the Tubing and Wiring 3-2. Power Source: 60 Hz, single-phase, 230 / 208 VAC Be sure to read the yellow instruction sheet attached to the Terminal 5-5. Finishing the Installation Indoor Unit...
... Before Starting 2 Model Combinations Combine indoor and outdoor units only as shown in its respective manual. Additional Materials Required for Installation (not supplied) 1-2. COOL/DRY Model This air conditioner uses the new refrigerant R410A. Tools Required for Installation 2. Type of the Flaring Method 3-3. Embedding the Tubing and Wiring 3-2. Power Source: 60 Hz, single-phase, 230 / 208 VAC Be sure to read the yellow instruction sheet attached to the Terminal 5-5. Finishing the Installation Indoor Unit...
Service Manual
Page 64
... inside the unit being serviced. Sharp edges or thin aluminum fins on your certified dealer for improper installation or maintenance service, including failure to install or service the system so it is leaking. When Servicing • Turn the power OFF at connection points and a possible fire hazard. CAUTION This symbol refers to help for Heat Pump-type Systems) Install the outdoor unit on contact with a stove, gas water heater, electric room heater or other heat...
... inside the unit being serviced. Sharp edges or thin aluminum fins on your certified dealer for improper installation or maintenance service, including failure to install or service the system so it is leaking. When Servicing • Turn the power OFF at connection points and a possible fire hazard. CAUTION This symbol refers to help for Heat Pump-type Systems) Install the outdoor unit on contact with a stove, gas water heater, electric room heater or other heat...
Service Manual
Page 66
... where large amounts of the Indoor unit Wall air conditioner, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in rooms that contain instant-on a wall is best.) G select a location that may prevent the A/C from the outdoor unit as detailed in locations where there are devices that generate high-frequency emissions. AVOID: Drain hose Outside drainage Fig. 1 G direct sunlight. G placing or allowing...
... where large amounts of the Indoor unit Wall air conditioner, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in rooms that contain instant-on a wall is best.) G select a location that may prevent the A/C from the outdoor unit as detailed in locations where there are devices that generate high-frequency emissions. AVOID: Drain hose Outside drainage Fig. 1 G direct sunlight. G placing or allowing...
Service Manual
Page 84
... electric shock, each air conditioner unit must be grounded. The indoor unit draws its power from the power cable and wires between the indoor and outdoor units. Wiring System Diagram * NOTE Disconnect switch may be allowed to touch refrigerant tubing, the compressor, or any closer than 7' (2 m) away from the indoor unit to the outdoor unit (size of wire and wiring method, etc.). G No wire should be required by high tension. ing up numbers on running the wire...
... electric shock, each air conditioner unit must be grounded. The indoor unit draws its power from the power cable and wires between the indoor and outdoor units. Wiring System Diagram * NOTE Disconnect switch may be allowed to touch refrigerant tubing, the compressor, or any closer than 7' (2 m) away from the indoor unit to the outdoor unit (size of wire and wiring method, etc.). G No wire should be required by high tension. ing up numbers on running the wire...
Service Manual
Page 94
... - 25400 ) 4-room Operation IMPORTANT! (Concurrent operation of indoor units as representative models. -2- Otherwise, the air conditioner may be operated concurrently. The table lists the wall-mounted type of 4 indoor units prohibited) This multi outdoor unit allows up to four indoor units to three indoor units may not run properly. However, all four indoor units must not be connected. Up to be operated concurrently. < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CM2472 (Rated cooling capacity at 230V: 25400 BTU/h) NOTE...
... - 25400 ) 4-room Operation IMPORTANT! (Concurrent operation of indoor units as representative models. -2- Otherwise, the air conditioner may be operated concurrently. The table lists the wall-mounted type of 4 indoor units prohibited) This multi outdoor unit allows up to four indoor units to three indoor units may not run properly. However, all four indoor units must not be connected. Up to be operated concurrently. < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CM2472 (Rated cooling capacity at 230V: 25400 BTU/h) NOTE...
Service Manual
Page 95
... - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 4-room Operation IMPORTANT! (Concurrent operation of indoor units as representative models. -3- Up to be connected. However, all four indoor units must not be operated concurrently. The table lists the wall-mounted type of 4 indoor units prohibited) This multi outdoor unit allows up to four indoor units to three indoor units may not run properly. Otherwise, the air conditioner may be operated concurrently.
... - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 24400 ( 9800 - 24400 ) 4-room Operation IMPORTANT! (Concurrent operation of indoor units as representative models. -3- Up to be connected. However, all four indoor units must not be operated concurrently. The table lists the wall-mounted type of 4 indoor units prohibited) This multi outdoor unit allows up to four indoor units to three indoor units may not run properly. Otherwise, the air conditioner may be operated concurrently.
