Sanyo CMH1972 Technical & Service Manual
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Sanyo CMH1972 Technical & Service Manual

Dc inverter multi-system air conditioner outdoor unit
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TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT : CMH1972
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
CMH1972
CMH2472
CMH3172
CMH2472
CMH3172
Capacity at 230V
Outdoor Model No.
19,100 BTU/h
CMH1972
23,200 BTU/h
CMH2472
30,600 BTU/h
CMH3172
FILE NO.
Destination: North America
Product Code No.
1 852 330 30
1 852 330 31
1 852 330 32
< Applicable Indoor Units >
●
Wall mounted type
KMHS0772
KMHS0972
KMHS1272
KMHS1872
KMHS2472
NOTE
For details about the combination, refer to
"Unit Combination Table" in the Appendix
of this manual.
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
REFERENCE NO.
SM
700660-04

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  • Page 1 TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CMH1972 FILE NO. CMH2472 CMH3172 Destination: North America DC INVERTER MULTI-SYSTEM AIR CONDITIONER Capacity at 230V Outdoor Model No. Product Code No. 19,100 BTU/h CMH1972 1 852 330 30 23,200 BTU/h CMH2472 1 852 330 31...
  • Page 2 Important! When Transporting Please Read Before Starting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees This air conditioning system meets strict safety and operating when lifting to reduce strain on your back. Sharp edges or thin standards.

  • Page 3: Table Of Contents

    Table of Contents Page ..................... APPLICABLE INDOOR UNITS ........................1. OPERATING RANGE 2. SPECIFICATIONS ......................2-1. Unit Specifications ..................2-2. Major Component Specifications ..................2-3. Other Component Specifications ........................3. DIMENSIONAL DATA 4. REFRIGERANT FLOW DIAGRAM ....................4-1. Refrigerant Flow Diagram 5.

  • Page 4: Applicable Indoor Units

    APPLICABLE INDOOR UNITS Indoor Unit KMHS0772 KMHS0972 KMHS1272 KMHS1872 KMHS2472 Multi-Outdoor Unit 　 3-Room CMH1972 　 4-Room CMH2472 　 CMH3172 4-Room NOTE The table lists the wall-mounted type of indoor units as representative models.

  • Page 5: Operating Range

    1. OPERATING RANGE Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. 95 °F D.B. / 71 °F W.B. 115 °F D.B. Maximum Cooling 67 °F D.B. / 57 °F W.B. 67 °F D.B. Minimum 80 °F D.B. / 67 °F W.B. 75 °F D.B.

  • Page 6: Specifications

    1. The Values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : KMHS0972 3units Outdoor Unit : CMH1972 1unit 2. Rating conditions are: Cooling : Indoor air temp. 80°F D.B./ 67°F W.B Heating : Indoor air temp.
  • Page 7 1. The Values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : KMHS0972 3units Outdoor Unit : CMH1972 1unit 2. Rating conditions are: Cooling : Indoor air temp. 80°F D.B./ 67°F W.B Heating : Indoor air temp.
  • Page 8 Outdoor Unit CMH2472 × Indoor Unit KMHS0972 < 230V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating 230V Single-Phase 60Hz Performance Cooling Heating Total Capacity BTU/h 23,200 ( 9,800 to 23,200 ) 29,200 ( 11,600 to 29,200 ) 6.80...
  • Page 9 Outdoor Unit CMH2472 × Indoor Unit KMHS0972 < 208V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating 208V Single-Phase 60Hz Performance Cooling Heating Total Capacity BTU/h 23,200 ( 9,800 to 23,200 ) 29,200 ( 11,600 to 29,200 ) 6.80...
  • Page 10 Outdoor Unit CMH3172 × Indoor Unit KMHS0972 < 230V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating 230V Single-Phase 60Hz Performance Cooling Heating Total Capacity BTU/h 30,600 ( 9,800 to 30,600 ) 32,000 ( 11,600 to 32,000 ) 9.00...
  • Page 11 Outdoor Unit CMH3172 × Indoor Unit KMHS0972 < 208V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units Voltage Rating 208V Single-Phase 60Hz Performance Cooling Heating Total Capacity BTU/h 28,600 ( 9,800 to 28,600 ) 32,000 ( 11,600 to 32,000 ) 8.40...

  • Page 12: Major Component Specifications

    2-2. Major Component Specifications 2-2-1. Outdoor Unit Outdoor Unit CMH1972 Control PCB Part No. CB-CMH1972 Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output 5KD240XAB21 / 1,700W Compressor Oil ... Amount Pints (cc) FV50S ...
  • Page 13 Outdoor Unit CMH2472 Control PCB Part No. CB-CMH2472 Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output 5KD240XAB21 / 1,700W Compressor Oil ... Amount Pints (cc) FV50S ... 1.91 (900) Coil Resistance (Ambient Temp. 68 °F (20 °C)) U - V : 0.720 V - W :...
  • Page 14 Outdoor Unit CMH3172 Control PCB Part No. CB-CMH3172 Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output 5JD420XAB22 / 3,000W Compressor Oil ... Amount Pints (cc) FV50S ... 2.55 (1,200) Coil Resistance (Ambient Temp. 68 °F (20 °C)) U - V : 0.435 V - W :...

  • Page 15: Other Component Specifications

    2-3. Other Component Specifications Quantity of Sensor Model No. Sensor Name of sensor CMH1972 CMH2472 CMH3172 Outdoor air temp sensor TKS295B Outdoor heat exchanger sensor TKS292B AW / AN sensor TKS292B 1 / 1 1 / 1 1 / 1...

  • Page 16: Dimensional Data

    3. DIMENSIONAL DATA Outdoor Unit CMH1972 23-15/16 5-11/32 15/32 11-17/32 35-7/16(900) 2-15/16 Wide tube service valve dia.3/8" (9.52) × 3 Narrow tube service valve dia.1/4" (6.35) × 3 2-1/32 4-1/2 1-13/16 2-1/16 Unit: inch(mm)
  • Page 17 Outdoor Unit CMH2472 23-15/16 5-11/32 15/32 11-17/32 35-7/16(900) 2-15/16 Wide tube service valve dia.3/8" (9.52) × 3 Narrow tube service valve dia.1/4" (6.35) × 4 Wide tube service valve dia.1/2" (12.70) × 1 2-1/32 4-1/2 1-13/16 2-1/16 2-13/32 Unit: inch(mm)
  • Page 18 Outdoor Unit CMH3172 23-15/16 5-11/32 15/32 11-17/32 35-7/16(900) 2-15/16 Wide tube service valve dia.3/8" (9.52) × 2 Narrow tube service valve dia.1/4" (6.35) × 4 Wide tube service valve dia.1/2" (12.70) × 2 2-1/32 4-1/2 1-13/16 2-1/16 2-13/32 Unit: inch(mm)

  • Page 19: Refrigerant Flow Diagram

    4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Outdoor Unit CMH1972 Indoor unit Outdoor unit Service valve on Main wide tube accumulator accumulator Wide tube O.D.3/8" High pressure O.D.3/8" switch H.P. O.D.3/8" Header 4-way valve Defrost valve for hot gas bypass...

  • Page 20: Insulation Of Refrigerant Tubing

    Outdoor Unit CMH2472 Indoor unit Outdoor unit Service valve on Main wide tube accumulator accumulator Wide tube O.D.3/8" High pressure O.D.3/8" switch H.P. O.D.3/8" O.D.1/2" 4-way Header valve Defrost valve for hot gas bypass Electric expansion Service valve on valve narrow tube Narrow tube O.D.1/4"...
  • Page 21 Outdoor Unit CMH3172 Indoor unit Outdoor unit Service valve on Main wide tube accumulator accumulator Wide tube O.D.3/8" High pressure O.D.3/8" switch H.P. O.D.1/2" O.D.1/2" 4-way Header valve Defrost valve for hot gas bypass Electric expansion Service valve on valve narrow tube Narrow tube O.D.1/4"...

  • Page 22: Performance Data

    5. PERFORMANCE DATA 5-1. Temperature Charts 5-1-1. Temperature Charts (CMH1972) × Outdoor Unit CMH1972 Indoor Unit KMHS0772 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz)
  • Page 23 × Outdoor Unit CMH1972 Indoor Unit KMHS0972 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart...
  • Page 24 × Outdoor Unit CMH1972 Indoor Unit KMHS1272 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (4.0)
  • Page 25 × Outdoor Unit CMH1972 Indoor Unit KMHS1872 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart...
  • Page 26 5-1-2. Temperature Charts (CMH2472) × Outdoor Unit CMH2472 Indoor Unit KMHS0772 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan Hi fan...
  • Page 27 × Outdoor Unit CMH2472 Indoor Unit KMHS0972 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan Hi fan HH fan...
  • Page 28 × Outdoor Unit CMH2472 Indoor Unit KMHS1272 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (4.0) Lo fan Hi fan...
  • Page 29 × Outdoor Unit CMH2472 Indoor Unit KMHS1872 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart HH fan Lo fan Hi fan...
  • Page 30 × Outdoor Unit CMH2472 Indoor Unit KMHS2472 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan Hi fan HH fan...
  • Page 31 5-1-3. Temperature Charts (CMH3172) × Outdoor Unit CMH3172 Indoor Unit KMHS0772 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (3.5) Lo fan...
  • Page 32 × Outdoor Unit CMH3172 Indoor Unit KMHS0972 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (3.5) Lo fan Hi fan...
  • Page 33 × Outdoor Unit CMH3172 Indoor Unit KMHS1272 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (3.5) Lo fan Hi fan...
  • Page 34 × Outdoor Unit CMH3172 Indoor Unit KMHS1872 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (3.5) Lo fan Hi fan...
  • Page 35 × Outdoor Unit CMH3172 Indoor Unit KMHS2472 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (3.5) Lo fan Hi fan...

  • Page 36: Cooling Capacity

    5-2. Cooling Capacity Outdoor Unit : CMH1972 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 19,100 BTU/h AIR FLOW RATE: 883 CFM INDOOR OUTDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B.
  • Page 37 Outdoor Unit : CMH2472 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 23,200 BTU/h AIR FLOW RATE: 883 CFM INDOOR OUTDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B. D.B.
  • Page 38 Outdoor Unit : CMH3172 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 30,600 BTU/h AIR FLOW RATE: 1,177 CFM INDOOR OUTDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B. D.B.

  • Page 39: Heating Capacity

    5-3. Heating Capacity Outdoor Unit : CMH1972 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 24,800 BTU/h AIR FLOW RATE: 847 CFM OUTDOOR INDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B.
  • Page 40 Outdoor Unit : CMH2472 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 29,200 BTU/h AIR FLOW RATE: 847 CFM OUTDOOR INDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B. (15.6) (18.3) (21.1)
  • Page 41 Outdoor Unit : CMH3172 × Indoor Unit : KMHS0972 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 32,000 BTU/h AIR FLOW RATE: 1,130 CFM OUTDOOR INDOOR ENT. TEMP. °F (°C) AMBIENT TEMP. °F (°C) W.B. (15.6) (18.3) (21.1)

  • Page 42: Electrical Data

    6. ELECTRICAL DATA 6-1. Electric Wiring Diagrams Outdoor Unit CMH1972 To avoid electrical shock hazard, be sure to WARNING disconnect power before checking, servicing and/or cleaning any electrical parts. UNIT INDDOR SUPPLY UNIT UNIT UNIT POWER INDDOR INDDOR INDDOR GRN/YEL...
  • Page 43 Outdoor Unit CMH2472 To avoid electrical shock hazard, be sure to WARNING disconnect power before checking, servicing and/or cleaning any electrical parts. UNIT INDDOR SUPPLY UNIT UNIT UNIT UNIT POWER INDDOR INDDOR INDDOR INDDOR GRN/YEL GRN/YEL (2P)CONNECTOR (2P)CONNECTOR (2P)CONNECTOR THERMISTOR THERMISTOR THERMISTOR THERMISTOR...
  • Page 44 Outdoor Unit CMH3172 To avoid electrical shock hazard, be sure to WARNING disconnect power before checking, servicing and/or cleaning any electrical parts. UNIT INDDOR SUPPLY UNIT UNIT UNIT UNIT POWER INDDOR INDDOR INDDOR INDDOR CORE FERRITE GRN/YEL GRN/YEL (2P)CONNECTOR (2P)CONNECTOR (2P)CONNECTOR THERMISTOR THERMISTOR...

  • Page 45: Functions

    7. FUNCTIONS 7-1. Explanation of Functions NOTE The numerical values such as temperature, frequency, time and current in parentheses are an example of CMH3172 and the values are different from the other models. Control/conditions Unit operation Explanation INITIAL Breaker is ON. Power is supplied to the indoor and outdoor unit control circuits, however the unit remains stopped.
  • Page 46 Control/conditions Unit operation Explanation HEAT The thermostat turns ON. The indoor unit is stopped. The unit operated before, and the temperature of the indoor heat exchanger is relatively warm. Therefore,the fan speed may start at the set fan speed at the same time that the thermostat turns When defrost operation Non-stop defrost Defrost operation begins based on outdoor...
  • Page 47 Outdoor heat Temperature of releasing exchanger temperature (°F) Defrost operation time Less than 2 minutes 2 minutes or more Outdoor air (- 4) Heat exchanger temperature (°F) 57.2 °F or higher (*1) No releasing temperature for (21.2) releasing defrosting (19.4) *1 The temperature for releasing of defrosting is (68 °F) or higher when the (-11.2) outdoor air temperature is less than 32 °F.
  • Page 48 Frequency control (senconds) (Hz) Outdoor air temperature is below 32 °F. Outdoor air temperature is 32 °F or higher. (25) Hz (120) seconds (60) seconds (35) Hz (60) seconds (30) seconds (45) Hz (60) seconds (30) seconds (55) Hz (180) seconds (90) seconds Table 2 (1/f fluctuation fan)
  • Page 49 1/f fluctuation fan (Step) 6-minute cycle Fig. 2...

  • Page 50: Protective Functions

    7-2. Protective Functions NOTE The numerical values such as temperature, frequency, time and current in parentheses are an example of CMH3172 and the values are different from the other models. 7-2-1. Defrost Detection and Release (1) Non-stop defrosting Defrosting sequence 4-way valve ON Defrost detection occurs in either of the following cases: The temperature of the heat exchanger remains at or below...

  • Page 51: Current Control

    7-2-2. Current Control The operating current may rise as a result of causes including increasing heating or cooling loads or decreases in power voltage. In these cases, the operating frequency is automatically reduced, or operation is stopped, in order to control the operating current so that it is (20 A) or less.
  • Page 52 7-2-3. Low Start Current Operation starts at (8 Hz), and the start current is less than the normal operating current. This prevents the flickering of fluorescent lights or television screens that occurs when ordinary A/C units start. 7-2-4. Compressor Temperature Control To protect the compressor coil from overheating, the operating frequency is controlled based on the compressor discharge temperature.

  • Page 53: Troubleshooting

    8. TROUBLESHOOTING 8-1. Precautions before Performing Inspection or Repair Both the indoor unit and outdoor unit include electronic control circuits. Be sure to pay attention to the following before inspecting or repairing the outdoor- side electronic circuits. High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 311 V) even after the power is turned OFF, and some time is required for the charge to dissipate.

  • Page 54: Trouble Diagnosis By Error Monitor Lamps

    8-2. Trouble Diagnosis by Error Monitor Lamps To prevent electric shock, do not inspect or repair until WARNING the Power Lamp on the P.C.Board is turned off. 8-2-1. Location of the Error Monitor Lamps Remove the top plate of outdoor unit and the cover of Electrical Component Box. The Power Lamp and Error Monitor Lamps are located on the P.C.Board of Electrical Component Box.

  • Page 55: Checking The Outdoor System

    8-3. Checking the Outdoor System 8-3-1. Checking the outdoor unit Work procedure Check items (unit operation) • Apply 220 V AC between terminals L1 and L2 on the • The LED (red) on the control board must illuminate. outdoor unit terminal plate. •...

  • Page 56: Trouble Diagnosis Of Each Part

    8-4. Trouble Diagnosis of Each Part 8-4-1. Problems of Each Part and Inspection Points For details about the inspection points, refer to the Inspection Points for Each Part. Indoor unit Outdoor unit Others Problems No. of Inspection Points for Each part Inspection points Self-Diagnostics check...
  • Page 57 Indoor unit Outdoor unit Others Problems No. of Inspection Points for Each part Inspection points Breaker (10) Refrigerant gas pressure 8-4-2. Inspection Points for Each Part (1) Outdoor control circuit board Refer to "8-3-1. Checking the outdoor unit". Do not remove or insert the outdoor control circuit board connector when power is being supplied to it. NOTE (The controller will be damaged.) (2) Fuse...
  • Page 58 10 to 20 seconds for No voltage on circuit board Voltage varies each point. Model No. Sequence CMH1972 CMH2472 CMH3172 Check the coil resistance. Check the illumination Check the resistance between the gray lead of the red Power Lamp.
  • Page 59 (8) Branch tubing temperature sensor Check that the sensor is securely contained in the thermostat holder. (9) Breaker Check whether or not the breaker has been tripped. Check that the breakers and fuses used are of the specified capacity. Check that the breaker and its line are exclusive for A/C use. (10) Refrigerant gas pressure Start a COOL test run, and messure the temperatures of the A/C intake air and discharge air.

  • Page 60: Trouble Diagnosis Of Fan Motor

    8-5. Trouble Diagnosis of Fan Motor This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. Perform the trouble diagnosis by Test Run mode described on Installation Instructions of indoor unit. Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.

  • Page 61: Refrigerant R410A: Special Precautions When Servicing Unit

    9. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9-1. Characteristics of New Refrigerant R410A 9-1-1. What is New Refrigerant R410A? R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22. 9-1-2.

  • Page 62: Checklist Before Servicing

    9-2. Checklist before Servicing Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer.

  • Page 63: Tools Specifically For R410A

    9-3. Tools Specifically for R410A For servicing, use the following tools for R410A Tool Distinction Tool Name Gauge manifold Charging hose Gas leak detector Refrigerant cylinder Charging cylinder Refrigerant recovery unit Vacuum pump with anti-reverse flow (*1) Tools specifically for R410A (Solenoid valve-installed type, which prevents oil from flowing back into the unit when the power is off, is recommended.) Vacuum pump (*2)...can be used if the following adapter is attached.

  • Page 64: In Case Of Compressor Malfunction

    9-5. In Case of Compressor Malfunction Should the compressor malfunction, be sure to make the switch to a replacement CAUTION compressor as quickly as possible. Use only the tools indicated exclusively for R410A. See "9-3. Tools Specifically for R410A." 9-5-1. Procedure for Replacing Compressor (1) Recovering refrigerant Any remaining refrigerant inside the unit should not be (1) Recover refrigerant...
  • Page 65 (5) Recharging Configuration and characteristics of cylinders Be sure to charge the specified amount of Valve refrigerant in liquid state using the service port of the wide tube service valve. The proper amount is listed on the unit's nameplate. When the entire amount cannot be charged all at once, charge gradually while operating the unit in Cooling Operation.

  • Page 66: In Case Refrigerant Is Leaking

    9-6. In Case Refrigerant is Leaking Never attempt to charge additional refrigerant when refrigerant has been leaking CAUTION from the unit. Follow the procedure described below to locate points of leaks and carry out repairs, then recharge the refrigerant. (1) Detecting Leaks Use the detector for R410A to locate refrigerant leak points.

  • Page 67: Charging Additional Refrigerant

    9-7. Charging Additional Refrigerant 9-7-1. When Tubes are Extended Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came with the indoor unit. Charge additional refrigerant in liquid state only. Never charge additional refrigerant if refrigerant is leaking from the unit. Follow CAUTION instructions given in "9-6.

  • Page 68: Appendix Ainstallation Instructions

    APPENDIX A INSTALLATION INSTRUCTIONS CMH1972 CMH2472 CMH3172 (II-852-6-4189-993-00-2)

  • Page 69: Installation Instructions

    INSTALLATION CHECK SHEET ...... 24 from that of the air conditioner that you are installing. SANYO Commercial Solutions In Canada A Division of SANYO North America Corporation SANYO Canada Inc. Cornerstone Business Park, 1-300 Applewood Crescent, Concord 1062 Thorndale Avenue, Ontario, L4K 5C7, Canada Bensenville, IL 60106, U.S.A.
  • Page 70 IMPORTANT! Please Read Before Starting When Installing… …In a Ceiling or Wall This air conditioning system meets strict safety and operating Make sure the ceiling/wall is strong enough to hold the standards. As the installer or service person, it is an important part of your job to install or service the system so it operates unit’s weight.
  • Page 71 (1/2" 3/8") CMH3172 Packed in the outdoor unit. Reducer Labels for inter-unit 4 each CMH1972 A B C D (3/8" 1/2") cable and tube 1-3. Optional Copper Tubing Kit Foamed polyethylene insulation for the specified copper tubes as required to precise length of tubing.

  • Page 72: Installation Site Selection

    1-5. Additional Materials Required for Installation Refrigeration (armored) tape Insulated staples or clamps for connecting wire (See local codes) Putty Refrigeration lubricant Clamps or saddles to secure refrigerant tubing Indoor unit 2. Installation Site Selection 2-1. Indoor Unit To prevent abnormal heat generation WARNING and the possibility of fire, do not place obstacles, enclosures and...
  • Page 73 (L1+L2+L3) or (H1, H2, H3, H4) Refrigerant per unit (L1+L2+L3) or (L1+L2+L3+L4) (ft.) (oz./ft.) (ft.) (L1+L2+L3+L4) (ft.) (ft.) CMH1972 150 (L1+L2+L3) 150 (L1+L2+L3) — CMH2472 150 (L1+L2+L3+L4) 200 (L1+L2+L3+L4) 0.22 CMH3172 150 (L1+L2+L3+L4) 230 (L1+L2+L3+L4) 0.22 * If total tubing length becomes 150 to 200 ft. (Max.) or 150 to 230 ft. (Max.), charge additional refrigerant (R410A) by 0.22 oz./ft.
  • Page 74 2-2. Connecting Indoor Units (1) Connecting indoor unit for CMH1972 Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) Fig. 4a Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 1/2"(12.70mm)
  • Page 75 Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 1/2"(12.70mm) (KMHS1872) 1/2"(12.70mm) 1/4"(6.35mm) Fig. 4d Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 5/8"(15.88mm) (KMHS2472) 1/2"(12.70mm) 1/4"(6.35mm) Flare 1/2"(12.70mm)
  • Page 76 (3) Connecting indoor unit for CMH3172 Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) Flare 1/2"(12.70mm) Union 3/8"(9.52mm) (1/2"(12.70mm) 3/8"(9.52mm)) Supplied Reducer Fig. 4g Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm)
  • Page 77 Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) 5/8"(15.88mm) (KMHS2472) 1/2"(12.70mm) 1/4"(6.35mm) Flare 1/2"(12.70mm) Union 5/8"(15.88mm) Flare 1/2"(12.70mm) Union 3/8"(9.52mm) (1/2"(12.70mm) 5/8"(15.88mm)) (1/2"(12.70mm) 3/8"(9.52mm)) Locally purchased Supplied Reducer Fig. 4j Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272)
  • Page 78 2-3. Outdoor Unit Exhaust fan AVOID: Hot air heat sources, exhaust fans, etc. (Fig. 5a) Heat source damp, humid or uneven locations. Outdoor unit choose a place as cool as possible. choose a place that is well ventilated. allow enough room around the unit for air intake/ Fig.
  • Page 79 2-4. Outer Dimensions of Outdoor Unit (1) CMH1972 23-15/16 5-11/32 15/32 35-7/16 (900) 2-29/32 Service valve on narrow tube side (Outer diameter 1/4"( 6.35 )) Service valve on wide tube side (Outer diameter 3/8"( 9.52 )) 2-1/32 4-1/2 1-13/16 2-1/16 Fig.

  • Page 80: Diagram Of Outdoor Unit Installation

    Diagram of Outdoor Unit Installation 2-5. Never install only a single indoor unit. Be sure to connect indoor and outdoor units only in combinations that are listed in the catalog or in the Indoor unit D combination table that was provided with the outdoor unit. (Use caution.
  • Page 81 3. Installation Process Embedding the Tubing and Wiring 3-1. Do not connect tubes to locations that are embedded. Be sure to bind refrigerant tubing and inter-unit cables together with vinyl tape. The power cable must be obtained on-site. (#12: Less than 85 ft.) # ...
  • Page 82 NOTE Copper tubing When reaming, hold the tube end downward and be sure that no copper scraps fall into the tube. (Fig. 9) (3) Remove the flare nut from the unit and be sure to mount Reamer it on the copper tube. (4) Make a flare at the end of copper tube with a flare tool.* (Figs.
  • Page 83 Torque wrench Be sure to match refrigerant CAUTION tubing and electric wiring between indoor and outdoor Spanner units. For more details, refer to Indoor unit “Tubing Check Control” in the Technical & Service Manual. Outdoor unit Fig. 15 3-6. Insulation of Refrigerant Tubing IMPORTANT To prevent heat loss and wet floors due to dripping of con- Insulation...

  • Page 84: Air Purging

    4. Air Purging Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. Therefore, they must be purged completely. Service pressure in the system rises valve on Manifold gauge narrow operating current rises (special for R410A) Service High-pressure valve Low-pressure...
  • Page 85 (4) With the “Lo” knob of the manifold valve open and high-pressure valve (“Hi”) closed completely, run the vacuum pump. Run the pump until the pres- sure is –101 kPa (–76 cmHg). The operation time for the vacuum pump varies with tubing length and the capacity of the pump.
  • Page 86 (11) Replace the flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or box wrench. Next, mount the valve cap and tighten it with a torque wrench (the cap needs to be tightened with the torque of 180 lbs·in (200 kgf·cm)).
  • Page 87 National Electric Code: ANSI/NFPA70. Table 6 Max. Power Line Length (ft.) Max. Control Line Length (ft.) Fuse (B) (C) Model Circuit Capasity (#12) (#14) CMH1972 85 (Max.) 82 (Max.) 20 A CMH2472 85 (Max.) 82 (Max.) 20 A CMH3172 85 (Max.) 100 (Max.)
  • Page 88 Always comply with national and local code requirements. indoor and outdoor units. Electrical noise may affect the operation. 5-3. Wiring System Diagram 4 indoor units with CMH2472, CMH3172 3 indoor units with CMH1972 Disconnect Disconnect switch Field supply switch Field supply...
  • Page 89 5-4. How to Connect Wiring to the Terminal Loose wiring may cause the WARNING terminal to overheat or result in unit malfunction. A fire hazard may also exist. There- fore, be sure all wiring is tightly connected. When connecting each power wire to the corresponding terminal, follow the instructions “How to connect wiring 9/32"...
  • Page 90 5-5. Wiring Instructions for the Outdoor Unit CAUTION Be sure to correctly align inter-unit cables A, B, C and D. Outdoor unit A Terminal board Power supply Indoor unit A (conduit) 1 2 3 4 5 6 7 8 9 10 11 12 Power: A is the indoor unit with Terminal board...
  • Page 91 Regulations on wire size differ from locality to locality. For Lock nut Cabinet field wiring requirements, please refer to your local electri- cal codes. Make sure that the installation fully complies with all local and national regulations. (1) Remove access panel “C”. (Fig. 32) (2) Connect the inter-unit and power supply line accord- ing to the drawing on the panel side.

  • Page 92: Installation Check Sheet

    7. Connecting a Home Automation Device The HA (white) 4P terminal is located on the indoor unit PCB. If a HA device will be used, connect it to this terminal. 8. Installation Check Sheet The strength of the installation location is sufficient to support the A/C weight. The indoor and outdoor units are installed level and vertically.

  • Page 93: Appendix B Unit Combination Tables

    UNIT COMBINATION TABLES < > List of Combination Tables Name of Combination Table Model No. of Outdoor Unit Remarks 3-Room Outdoor Unit Combination Table CMH1972 OI-852-6-4180-821-00-4 4-Room Outdoor Unit Combination Table CMH2472 OI-852-6-4180-822-00-5 4-Room Outdoor Unit Combination Table CMH3172 OI-852-6-4180-805-00-4...
  • Page 94 Example: When 3 indoor units are connected at 230V If the following holds true Rated cooling capacity of CMH1972 outdoor unit: C=19100 (BTU/h) Rated cooling capacity of indoor units: K1, K2, ... (BTU/h) Then: C x 2 (200%) K1 + K2 + ..
  • Page 95 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CMH1972 NOTE (Rated cooling capacity at 230V: 19100 BTU/h) 7500 : KMHS0772 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 Table 1 Indoor Unit Capacity (BTU/h) COOLING...
  • Page 96 Voltage Rating : 208V 60Hz CMH1972 NOTE (Rated cooling capacity at 208V: 19100 BTU/h) 7500 : KMHS0772 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 Table 2 Indoor Unit Capacity (BTU/h) COOLING HEATING Indoor Unit Combination Room Room Room...
  • Page 97 Be sure to operate the air conditioning system only when 2 or more indoor units have been installed. If operated with only a single unit installed, the returning fluid to the compressor may cause a malfunction. Pub. OI-85264180 © SANYO 2008...
  • Page 98 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz NOTE CMH2472 7500 : KMHS0772 (Rated cooling capacity at 230V: 23200 BTU/h) 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 24200 : KMHS2472 Table 1 Indoor Unit Capacity (BTU/h) COOLING HEATING Indoor Unit Combination...
  • Page 99 Voltage Rating : 208V 60Hz NOTE CMH2472 7500 : KMHS0772 (Rated cooling capacity at 208V: 23200 BTU/h) 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 24200 : KMHS2472 Table 2 Indoor Unit Capacity (BTU/h) COOLING HEATING Indoor Unit Combination Room Room Room...
  • Page 100 Be sure to operate the air conditioning system only when 2 or more indoor units have been installed. If operated with only a single unit installed, the returning fluid to the compressor may cause a malfunction. Pub. OI-85264180 © SANYO 2008...
  • Page 101 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz NOTE CMH3172 7500 : KMHS0772 (Rated cooling capacity at 230V: 30600 BTU/h) 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 24200 : KMHS2472 Table 1 Indoor Unit Capacity (BTU/h) COOLING HEATING Indoor Unit Combination...
  • Page 102 Voltage Rating : 208V 60Hz NOTE CMH3172 7500 : KMHS0772 (Rated cooling capacity at 208V: 28600 BTU/h) 9000 : KMHS0972 11900 : KMHS1272 17500 : KMHS1872 24200 : KMHS2472 Table 2 Indoor Unit Capacity (BTU/h) COOLING HEATING Indoor Unit Combination Room Room Room...
  • Page 103 SANYO Commercial Solutions A Division of SANYO North America Corporation Cornerstone Business Park, 1062 Thorndale Avenue, Bensenville, IL 60106, U.S.A. Sanyo Canada Inc. 1-300 Applewood Crescent, Concord, Ontario L4K 5C7, CANADA Jan. / 2008 (T)

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