Page 1 FILE NO. SERVICE FLASH ADDED INFORMATION Please add this notice to the TECHNICAL & SERVICE MANUAL listed below. Category : DC INVERTER MULTI-SYSTEM AIR CONDITIONER Date : April, 2010 CMH1972A CMH2472A Model : CMH3172A Destination : North America Serial No. :...
Page 2 For Parts or Service Assistance please contact your local Sanyo HVAC Contractor or Distributor United States: SCS, HVAC Solutions Canada: Sanyo Canada Inc. Web: www.SanyoHVAC.com Web: www.SanyoHVAC.com Parts: hvac.parts@sna.sanyo.com Parts/Service: hvac@sci.sanyo.com Service: hvac.service@sna.sanyo.com 4/10 Printed in Japan...
Page 3: Sm700855
TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CMH1972A FILE NO. CMH2472A CMH3172A Destination: North America DC INVERTER MULTI-SYSTEM AIR CONDITIONER Capacity at 230V Outdoor Model No. Product Code No. 19,100 BTU/h CMH1972A 1 852 356 13 23,200 BTU/h CMH2472A 1 852 356 09...
Page 4: Safety Precautions
SAFETY PRECAUTIONS • Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them. • The precautionary items here are divided into " Warning" and " Caution" items. Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, are included in the "...
Page 5 Warning If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite. Prohibit If refrigerant gas leaks during the work, ventilate the room. If refrigerant gas catches fire, harmful gas may be generated. Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle.
Page 6: Table Of Contents
Table of Contents Page SAFETY PRECAUTIONS ......................TABLE OF CONTENTS ........................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 ....................
Page 7 Page 9. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9-1. Characteristics of New Refrigerant R410A ................. 9-2. Checklist before Servicing ....................9-3. Tools Specifically for R410A ....................9-4. Tubing Installation Procedures .................... 9-5. In Case of Compressor Malfunction ..................9-6. In Case Refrigerant is Leaking ....................
Page 8: Applicable Indoor Units
APPLICABLE INDOOR UNITS Wall Mounted Type Indoor Unit KMHS0772 KMHS0972 KMHS1272 KMHS1872 KMHS2472 Multi-Outdoor Unit 　 3-Room CMH1972A 　 4-Room CMH2472A 　 4-Room CMH3172A Semi-Concealed Type XMHS0972 XMHS1272 XHS1872 Indoor Unit & & & PNR-XS1872 PNR-XS1872 PNR-XS1872 Multi-Outdoor Unit 3-Room...
Page 9: Operating Range
1. OPERATING RANGE Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum 95 °F D.B. / 71 °F W.B. 115 °F D.B. Cooling Minimum 67 °F D.B. / 57 °F W.B. 14 °F D.B. Maximum 80 °F D.B. / 67 °F W.B. 75 °F D.B.
Page 10: 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 : CMH1972A 1unit 2. Rating conditions are: Cooling : Indoor air temp. 80°F D.B./ 67°F W.B Heating : Indoor air temp.
Page 11 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 : CMH1972A 1unit 2. Rating conditions are: Cooling : Indoor air temp. 80°F D.B./ 67°F W.B Heating : Indoor air temp.
Page 12 Outdoor Unit CMH2472A × 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 Cooling Heating Total Capacity BTU/h 23,200 ( 9,800 to 23,200 ) 29,200 ( 11,600 to 29,200 ) 6.80...
Page 13 Outdoor Unit CMH2472A × 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 Cooling Heating Total Capacity BTU/h 23,200 ( 9,800 to 23,200 ) 29,200 ( 11,600 to 29,200 ) 6.80...
Page 14 Outdoor Unit CMH3172A × 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 Cooling Heating Total Capacity BTU/h 30,600 ( 9,800 to 30,600 ) 32,000 ( 11,600 to 32,000 ) 9.00...
Page 15 Outdoor Unit CMH3172A × 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 Cooling Heating Total Capacity BTU/h 28,600 ( 9,800 to 28,600 ) 32,000 ( 11,600 to 32,000 ) 8.40...
Page 16: Major Component Specifications
2-2. Major Component Specifications 2-2-1. Outdoor Unit Outdoor Unit CMH1972A Control PCB Part No. CB-CMH1972A 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 17 Outdoor Unit CMH2472A Control PCB Part No. CB-CMH2472A 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 18 Outdoor Unit CMH3172A Control PCB Part No. CB-CMH3172A 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 19: Other Component Specifications
2-3. Other Component Specifications Quantity of Sensor Model No. Sensor Name of sensor CMH1972A CMH2472A CMH3172A Outdoor air temp sensor TKS295B Outdoor heat exchanger sensor TKS292B AW / AN sensor TKS292B 1 / 1 1 / 1 1 / 1...
Page 20: Dimensional Data
3. DIMENSIONAL DATA Outdoor Unit CMH1972A 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) (852-0-0010-11200-0)
Page 21 Outdoor Unit CMH2472A 23-15/16 5-11/32 15/32 11-17/32 35-7/16(900) 2-15/16 Wide tube service valve dia.1/2" (12.70) × 1 Narrow tube service valve dia.1/4" (6.35) × 4 Wide tube service valve dia.3/8" (9.52) × 3 2-1/32 4-1/2 1-13/16 2-1/16 2-13/32 Unit: inch(mm) (852-0-0010-20400-0)
Page 22 Outdoor Unit CMH3172A 23-15/16 5-11/32 15/32 11-17/32 35-7/16(900) 2-15/16 Wide tube service valve dia.1/2" (12.70) × 2 Narrow tube service valve dia.1/4" (6.35) × 4 Wide tube service valve dia.3/8" (9.52) × 2 2-1/32 4-1/2 1-13/16 2-1/16 2-13/32 Unit: inch(mm) (852-0-0010-20300-0)
Page 23: Refrigerant Flow Diagram
4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Outdoor Unit CMH1972A 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 24: Insulation Of Refrigerant Tubing
Outdoor Unit CMH2472A Indoor unit Outdoor unit Service valve on Main wide tube accumulator accumulator Wide tube O.D.1/2" High pressure O.D.3/8" switch H.P. O.D.3/8" O.D.3/8" 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 25 Outdoor Unit CMH3172A Indoor unit Outdoor unit Service valve on Main wide tube accumulator accumulator Wide tube O.D.1/2" High pressure O.D.1/2" switch H.P. O.D.3/8" O.D.3/8" 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 26: Performance Data
5. PERFORMANCE DATA 5-1. Temperature Charts 5-1-1. Temperature Charts (CMH1972A) × Outdoor Unit CMH1972A Indoor Unit KMHS0772 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz)
Page 27 × Outdoor Unit CMH1972A 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 28 × Outdoor Unit CMH1972A 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 29 × Outdoor Unit CMH1972A 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 30 × Outdoor Unit CMH1972A Indoor Unit XMHS0972 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 31 × Outdoor Unit CMH1972A Indoor Unit XMHS1272 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 (1.2)
Page 32 × Outdoor Unit CMH1972A Indoor Unit XHS1872 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 (1.2)
Page 33 5-1-2. Temperature Charts (CMH2472A) × Outdoor Unit CMH2472A 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 34 × Outdoor Unit CMH2472A 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 35 × Outdoor Unit CMH2472A 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 36 × Outdoor Unit CMH2472A 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 37 × Outdoor Unit CMH2472A 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 38 × Outdoor Unit CMH2472A Indoor Unit XMHS0972 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 39 × Outdoor Unit CMH2472A Indoor Unit XMHS1272 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 (1.2) (4.0) Lo fan...
Page 40 × Outdoor Unit CMH2472A Indoor Unit XHS1872 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 (1.2) HH fan Lo fan...
Page 41 5-1-3. Temperature Charts (CMH3172A) × Outdoor Unit CMH3172A 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 42 × Outdoor Unit CMH3172A 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 43 × Outdoor Unit CMH3172A 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 44 × Outdoor Unit CMH3172A 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 45 × Outdoor Unit CMH3172A 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 46 × Outdoor Unit CMH3172A Indoor Unit XMHS0972 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 47 × Outdoor Unit CMH3172A Indoor Unit XMHS1272 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 48 × Outdoor Unit CMH3172A Indoor Unit XHS1872 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 49: Cooling Capacity
5-2. Cooling Capacity Outdoor Unit : CMH1972A × 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 50 Outdoor Unit : CMH1972A × Indoor Unit : XMHS1272 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 17,400 BTU/h AIR FLOW RATE: 706 CFM ENT. TEMP. W.B. D.B. (18.3) (23.9) (29.4) (35.0) (40.6) (46.1) 17,460...
Page 51 Outdoor Unit : CMH2472A × 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 52 Outdoor Unit : CMH2472A Indoor Unit : XHS1872 + XMHS1272 + XMHS1272 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 22,000 BTU/h AIR FLOW RATE: 812 CFM ENT. TEMP. W.B. D.B. (18.3) (23.9) (29.4) (35.0) (40.6) (46.1) 22,200...
Page 53 Outdoor Unit : CMH3172A × 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 54 Outdoor Unit : CMH3172A × Indoor Unit : XMHS0972 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 28,600 BTU/h AIR FLOW RATE: 883 CFM ENT. TEMP. W.B. D.B. (18.3) (23.9) (29.4) (35.0) (40.6) (46.1) 29,100 28,130 27,060 26,410...
Page 55: Heating Capacity
5-3. Heating Capacity Outdoor Unit : CMH1972A × 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 56 Outdoor Unit : CMH1972A × Indoor Unit : XMHS1272 Power Supply : 230V Single Phase 60Hz < Heating Capacity > ENT. TEMP. (15.6) (18.3) (21.1) (23.9) (26.7) 0 (-17.8) 13,310 13,300 13,270 13,240 13,200 1.10 1.15 1.21 1.27 1.32 3 (-16.1)
Page 57 Outdoor Unit : CMH2472A × 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 58 Outdoor Unit : CMH2472A Indoor Unit : XHS1872 + XMHS1272 + XMHS1272 Power Supply : 230V Single Phase 60Hz < Heating Capacity > ENT. TEMP. (15.6) (18.3) (21.1) (23.9) (26.7) 0 (-17.8) 16,030 16,040 16,050 16,040 16,020 1.45 1.52 1.60 1.67 1.74 3 (-16.1)
Page 59 Outdoor Unit : CMH3172A × 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 60 Outdoor Unit : CMH3172A × Indoor Unit : XMHS0972 Power Supply : 230V Single Phase 60Hz < Heating Capacity > ENT. TEMP. (15.6) (18.3) (21.1) (23.9) (26.7) 0 (-17.8) 18,200 18,180 18,140 18,100 18,040 1.48 1.55 1.63 1.70 1.77 3 (-16.1) 18,800 18,780 18,740...
Page 61: Electrical Data
6. ELECTRICAL DATA 6-1. Electric Wiring Diagrams Outdoor Unit CMH1972A 8FA2-5257-59100-1...
Page 62 Outdoor Unit CMH2472A 8FA2-5257-59300-1...
Page 63 Outdoor Unit CMH3172A 8FA2-5257-89400-1...
Page 64: 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 CMH3172A 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 65 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 66 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) No releasing 57.2 °F or higher (*1) 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 67 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 68 1/f fluctuation fan (Step) 6-minute cycle Fig. 2...
Page 69 < Low Ambient Cooling Operation > When the outdoor air temperature reaches 57.2 °F (14 °C ) or less during the cooling operation, the operation mode is switched to low ambient cooling operation. When the mode is switched from cooling opration to low ambient cooling operation, the compressor is stopped for 150 seconds temporarily.
Page 70: Protective Functions
7-2. Protective Functions The numerical values such as temperature, frequency, time and current in parentheses are an example NOTE of CMH3172A 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 71: 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 72 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 73: 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 74: Trouble Diagnosis By Error Monitop Lamps
8-2. Trouble Diagnosis by Error Monitor Lamps To prevent electric shock, do not inspect or repair until the Power Lamp on Warning 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 75: 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 76: 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 77 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 78 10 to 20 seconds for No voltage on circuit board Voltage varies each point. Model No. Sequence CMH1972A CMH2472A CMH3172A Check the coil resistance. Check the illumination Check the resistance between the gray lead of the red Power Lamp.
Page 79 (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 80: 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 81: 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 82: 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 83: 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 84: 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 85 (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 86: 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 87: 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 88: Appendix Ainstallation Instructions
APPENDIX A INSTALLATION INSTRUCTIONS CMH1972A CMH2472A CMH3172A (II-852-6-4190-507-00-0)
Page 89: Contents
In Canada attached to the outdoor unit for models using the Commercial Solutions Division SANYO Canada Inc. new refrigerant R410A. 2055 Sanyo Ave., San Diego 201 Creditview Road, Woodbridge CA 92154, U.S.A. Ontario, L4L 9T1, Canada 85264190 000 © SANYO 2010...
Page 90 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 91 (1/2" 3/8") CMH3172A Packed in the outdoor unit. Reducer Labels for inter-unit 4 each CMH1972A 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 92: Installation Site Selection
2. Installation Site Selection Indoor unit 2-1. Indoor Unit To prevent abnormal heat generation WARNING and the possibility of fire, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in a way that may block air flow.
Page 93 (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.) CMH1972A 150 (L1+L2+L3) 150 (L1+L2+L3) — CMH2472A 150 (L1+L2+L3+L4) 200 (L1+L2+L3+L4) 0.22 CMH3172A 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 94 Figures (4a) – (4k) show the different types of indoor unit connections, including the use of a reducer. To select the required indoor unit to be connected, refer to the Combination Table that was included in the outdoor unit package. (1) Connecting indoor unit for CMH1972A Outdoor unit Indoor unit 3/8"(9.52mm)
Page 95 Outdoor unit Indoor unit 1/2"(12.70mm) (KMHS1872) (XHS1872) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) Fig. 4d (1/2"(12.70mm) 5/8"(15.88mm)) Locally purchased Flare 1/2"(12.70mm) Union 5/8"(15.88mm) Outdoor unit Indoor unit 5/8"(15.88mm) (KMHS2472) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm)
Page 96 (3) Connecting indoor unit for CMH3172A (1/2"(12.70mm) 3/8"(9.52mm)) Supplied Reducer Flare 1/2"(12.70mm) Union 3/8"(9.52mm) Outdoor unit Indoor unit 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) Fig. 4g (1/2"(12.70mm 3/8"(9.52mm)) Supplied Reducer Flare 1/2"(12.70mm)
Page 97 (1/2"(12.70mm) 5/8"(15.88mm))Locally purchased Flare 1/2"(12.70mm) Union 5/8"(15.88mm) Outdoor unit Indoor unit 5/8"(15.88mm) (KMHS2472) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) (KMHS0772,KMHS0972,KMHS1272) (XMHS0972,XMHS1272) 3/8"(9.52mm) 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. 4j (1/2"(12.70mm) 5/8"(15.88mm)) Locally purchased Flare 1/2"(12.70mm) Union 5/8"(15.88mm)
Page 98 2-3. Outdoor Unit Exhaust fan AVOID: Hot air heat sources, exhaust fans, etc. (Fig. 5a) Heat source damp, humid or uneven locations. Obstacle above Outdoor unit choose a place as cool as possible. Min. choose a place that is well ventilated. Min.
Page 99 Dimensions Model (inch) 25-3/16 25/32 1-31/32 10-5/8 10-5/8 25/64 25/32 19/32 25-7/8 19/64 25/64 5-29/32 25/32 25/32 CMH1972A, CMH2472A (mm) (inch) 25-3/16 25/32 1-3/8 30-29/32 13-25/32 13-25/32 25/64 25/32 19/32 31-25/32 19/64 25/64 5-29/32 25/32 25/32 CMH3172A (mm) For Air Discharge...
Page 100 (3) Installation procedure 1. Air Intake Baffle 2. Air Discharge Baffle 1. Remove the panels front, top, side L and R from the (1) Left side unit and drill 4 holes of ø1/4 inch (6.5 mm) at the 1. Remove the top panel from the unit. prescribed positions.
Page 101 2-5. Outer Dimensions of Outdoor Unit (1) CMH1972A 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 102: Diagram Of Outdoor Unit Installation
Diagram of Outdoor Unit Installation 2-6. Never install only a single indoor unit. Ceiling-mounted Wall-mounted types cassette types Indoor unit D Indoor unit D Be sure to connect indoor and outdoor units only in combinations that are listed in the catalog or in the combination table that was provided with the outdoor unit.
Page 103 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 104 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 105 Torque wrench Be sure to match refrigerant CAUTION tubing and electric wiring between indoor and outdoor Spanner Indoor unit units. Outdoor unit Fig. 15 3-6. Insulation of Refrigerant Tubing Insulation IMPORTANT Thickness: min. 5/16" Min. To prevent heat loss and wet floors due to dripping of con- (8 mm) 5/16"...
Page 106: Air Purging
3-7. Taping the Tubes After a tube has been insulated, CAUTION never try to bend it into a narrow curve, as this may cause the tube Clamp to break or crack. Insulated tubes (1) At this time, the 2 refrigerant tubes (and electrical wire if local codes permit) should be taped together with armoring tape.
Page 107 Stopper Cap tightening torque: 170 – 215 lbs·in Spindle Perform the air purge for tubes A, B, C, and D. Use the same (200 – 250 kgf·cm) procedures for all tubes. Service port (Tighten by hand, then Screw diameter: 1/2 (1) Check that each tube (both narrow and wide tubes) use a wrench to turn UNF 20 threads...
Page 108 (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 109: Wiring Instructions
National Electric Code: ANSI/NFPA70. Table 6 Max. Power Line Length (ft.) Max. Control Line Length (ft.) Fuse (B) (C) Model Circuit Capacity (#12) (#14) CMH1972A 85 (Max.) 82 (Max.) 20 A CMH2472A 85 (Max.) 82 (Max.) 20 A CMH3172A 85 (Max.) 100 (Max.)
Page 110 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 CMH2472A, CMH3172A 3 indoor units with CMH1972A Disconnect Disconnect switch switch Field supply Field supply...
Page 111 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 112 5-5. Wiring Instructions for the Outdoor Unit CAUTION Be sure to correctly align inter-unit cables A, B, C and D. Outdoor unit Terminal board Power supply 1 2 3 4 5 6 7 8 9 10 11 12 (conduit) Power: Single-phase, 230/208VAC 60HZ Power breaker...
Page 113 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 114 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 air conditioner weight. The indoor and outdoor units are installed level and vertically.
Page 115: Appendix B Unit Combination Tables
Name of Model No. of Type of Remarks Combination Table Outdoor Unit Indoor Unit Wall Mounted Type OI-852-6-4180-821-00-5 3-Room Outdoor Unit CMH1972A Combination Table Semi-Concealed Type OI-852-6-4181-160-00-1 Wall Mounted Type OI-852-6-4180-822-00-6 4-Room Outdoor Unit CMH2472A Combination Table Semi-Concealed Type OI-852-6-4181-161-00-1...
Page 116 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 2010...
Page 117 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CMH1972, A 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 HEATING Indoor Unit Combination...
Page 118 Voltage Rating : 208V 60Hz CMH1972, A 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 Total Performance Room...
Page 119 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-85264181 © SANYO 2010...
Page 120 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CMH1972, A NOTE (Rated cooling capacity at 230V: 19100 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 1 Indoor Unit Capacity (BTU/h) Indoor Unit Combination Total Performance Total Performance Room...
Page 121 Voltage Rating : 208V 60Hz CMH1972, A NOTE (Rated cooling capacity at 208V: 19100 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 2 Indoor Unit Capacity (BTU/h) Indoor Unit Combination Total Performance Total Performance Room Room Room Room Room Room...
Page 122 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 2010...
Page 123 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz NOTE CMH2472, A 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) Indoor Unit Combination Capacity ( Min.
Page 124 Voltage Rating : 208V 60Hz NOTE CMH2472, A 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) Indoor Unit Combination Total Performance Total Performance Capacity ( Min.
Page 125 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-85264181 © SANYO 2010...
Page 126 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CMH2472, A NOTE (Rated cooling capacity at 230V: 23200 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 1 Indoor Unit Capacity (BTU/h) Indoor Unit Combination T otal Performance Total Performance Room...
Page 127 Voltage Rating : 208V 60Hz CMH2472, A NOTE (Rated cooling capacity at 208V: 23200 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 2 Indoor Unit Capacity (BTU/h) Indoor Unit Combination T otal Performance Total Performance Room Room Room Room Room...
Page 128 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 2010...
Page 129 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz NOTE CMH3172, A 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 130 Voltage Rating : 208V 60Hz NOTE CMH3172, A 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 131 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-85264181 © SANYO 2010...
Page 132 < Combinations of operatable indoor units > Voltage Rating : 230V 60Hz CMH3172, A NOTE (Rated cooling capacity at 230V: 30600 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 1 Indoor Unit Capacity (BTU/h) Indoor Unit Combination Total Performance Total Performance Room...
Page 133 Voltage Rating : 208V 60Hz CMH3172, A NOTE (Rated cooling capacity at 208V: 28600 BTU/h) 9000 : XMHS0972 11900 : XMHS1272 17500 : XHS1872 Table 2 Indoor Unit Capacity (BTU/h) Indoor Unit Combination Total Performance Total Performance Room Room Room Room Room Room...
Page 134 For Parts or Service Assistance please contact your local Sanyo HVAC Contractor or Distributor United States: SCS, HVAC Solutions Canada: Sanyo Canada Inc. Web: www.SanyoHVAC.com Web: www.SanyoHVAC.com Parts: hvac.parts@sna.sanyo.com Parts/Service: hvac@sci.sanyo.com Service: hvac.service@sna.sanyo.com 4/10 Printed in Japan...

This manual is also suitable for:

Cmh3172a Cmh2472a

Sanyo CMH1972A Technical & Service Manual

Safety Precautions

Table of Contents

Applicable Indoor Units

1 Operating Range

2 Specifications

3 Dimensional Data

4 Refrigerant Flow Diagram

5 Performance Data

6 Electrical Data

7 Functions

8 Troubleshooting

9 Refrigerant R410A: Special Precautions When Servicing Unit

Appendix Ainstallation Instructions

Appendix B Unit Combination Tables

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