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Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual
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Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual

Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual

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Table of Contents

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
<Outdoor unit>
[Model Name]
PUMY-P36NKMU2
PUMY-P48NKMU2
PUMY-P60NKMU2
PUMY-HP36NKMU
PUMY-HP48NKMU
Salt proof model
PUMY-P36NKMU2-BS
PUMY-P48NKMU2-BS
PUMY-P60NKMU2-BS
[Service Ref.]
PUMY-P36NKMU2
PUMY-P48NKMU2
PUMY-P60NKMU2
PUMY-HP36NKMU
PUMY-HP48NKMU
PUMY-P36NKMU2-BS
PUMY-P48NKMU2-BS
PUMY-P60NKMU2-BS
Model name
indication
OUTDOOR UNIT
REVISED EDITION-B
Revision:
• Precaution in 1. SAFETY
OCH695A is void.
Note:
• This service manual
CONTENTS
1. SAFETY PRECAUTION ······················· 2
2. OVERVIEW OF UNITS ························ 5
3. SPECIFICATIONS ···························· 10
4. DATA ·············································· 12
5. OUTLINES AND DIMENSIONS ··········· 32
6. WIRING DIAGRAM ··························· 34
FOR SYSTEM CONSTRUCTION ········· 37
8. TROUBLESHOOTING ······················· 48
9. ELECTRICAL WIRING ·····················124
10. REFRIGERANT PIPING TASKS ·········129
11. DISASSEMBLY PROCEDURE ···········136
PARTS CATALOG (OCB695)
HFC
utilized
R410A
June 2021
No. OCH695
PRECAUTION has been
added in REVISED
EDITION-B.
describes technical data of
the outdoor units only.

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Summary of Contents for Mitsubishi Electric PUMY-P36NKMU2-BS

  • Page 1: Table Of Contents

    PUMY-HP36NKMU PUMY-HP36NKMU PUMY-HP48NKMU Note: PUMY-HP48NKMU • This service manual describes technical data of the outdoor units only. Salt proof model PUMY-P36NKMU2-BS PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-P60NKMU2-BS CONTENTS 1. SAFETY PRECAUTION ······················· 2 2. OVERVIEW OF UNITS ························ 5 3. SPECIFICATIONS ···························· 10 4.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Preparation before the repair service Precautions during the repair service • Prepare the proper tools. • Do not perform the work involving the electric parts with wet •...
  • Page 3 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.
  • Page 4 Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 5: Overview Of Units

    OVERVIEW OF UNITS 2-1. Auxiliary HEATING ON/OFF CONTROL SET-UP (1) Auxiliary heating operation controls another heat source that depends on the main system's operations, which means the interlock operation shown in "b)" will be possible. Indoor unit must be R410A UL model for this function to operate. b) Different Indoor unit applications that can be applied: (2) Outdoor unit DIPSW5-4 for auxiliary heating control: Set DIPSW5-4 when power is turned off at unit.
  • Page 6 (4) Determine fan speed setting during indoor thermo-OFF conditions: a) These settings are done within Indoor DIPSW1-7 and DIPSW1-8, see chart below for options. b) Recommended SW1-7 OFF and SW1-8 ON will determine airflow based on "Setting on the remote controller". Auxiliary heating Fan speed Fan speed...
  • Page 7 (6) Locally procured wiring A basic connection method is shown. (i.e. interlocked operation with the electric heater with the fan speed setting on high) Indoor unit Outdoor unit Remote control Board Relay circuit control board control board Adapter Dip switch SW5-4 "ON"...
  • Page 8 2-2. SYSTEM CONSTRUCTION PUMY-P36NKMU2 PUMY-P48NKMU2 Outdoor unit PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU Capacity Type 05 to Type 36 Type 05 to Type 54 Type 05 to Type 72 Applicable Number of units 1 to 9 unit 1 to 12 unit...
  • Page 9 2-3. SYSTEM SPECIFICATIONS (1) Outdoor Unit PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 Service Ref. PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU Capacity Cooling (kBtu/h) 36.0 48.0 60.0 Heating (kBtu/h) 42.0 54.0 66.0 Compressor (kW) Cooling/Heating capacity indicates the maximum value at operation under the following condition.

  • Page 10: Specifications

    Motor output 0.074 + 0.074 0.2 + 0.2 External static press. Compressor Type x Quantity Scroll hermetic compressor × 1 Manufacture Mitsubishi Electric Corporation Starting method Inverter Motor output Case heater Lubricant FV50S (2.3 liter) FVC68D (2.3 liter) External finish Galvanized Steel Sheet <MUNSELL 3Y 7.8/1.1>...
  • Page 11 Control, Driving mechanism DC control Motor output 0.074 + 0.074 External static press. Compressor Type x Quantity Scroll hermetic compressor × 1 Manufacture Mitsubishi Electric Corporation Starting method Inverter Motor output Case heater Lubricant FV50S (2.3 liter) External finish Galvanized Steel Sheet <MUNSELL 3Y 7.8/1.1>...

  • Page 12: Data

    DATA 4-1. SELECTION OF COOLING/HEATING UNITS How to determine the capacity when less than or equal 100% indoor model size units are connected in total: The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference. Determine the load (L) and the Indoor/Outdoor Temperature Temporarily select the Indoor/Outdoor Units...
  • Page 13 How to determine the capacity when greater than 100% indoor model size units are connected in total: The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference. Determine the load (L) and the Indoor/Outdoor Temperature Temporarily select the indoor/outdoor units...
  • Page 14 <Cooling> Design Condition Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC) Total Cooling Load 30.3 kBtu/h Room1 Indoor Design Dry Bulb Temperature 80.6ºF (27.0ºC) Indoor Design Wet Bulb Temperature 68.0ºF (20.0ºC) Cooling Load 13.6 kBtu/h Room2 Indoor Design Dry Bulb Temperature 75.2ºF (24.0ºC) Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC)
  • Page 15 <Heating> Design Condition 35.6ºF (2.0ºC) Outdoor Design Wet Bulb Temperature Total Heating Load 34.4 kBtu/h Room1 Indoor Design Dry Bulb Temperature 69.8ºF (21.0ºC) 16.3 kBtu/h Heating Load Room2 Indoor Design Dry Bulb Temperature 73.4ºF (23.0ºC) Heating Load 18.1 kBtu/h <Other> Indoor/Outdoor Equivalent Piping Length 328 ft Capacity of indoor unit...
  • Page 16 3. Power input of outdoor unit Outdoor unit: PUMY-P36 Indoor unit 1: PEFY-P15 Indoor unit 2: PEFY-P18 <Cooling> (1) Rated power input of outdoor unit 2.31 kW (2) Calculation of the average indoor temperature power input coefficient Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 68.0°F [20.0°C] W.B.) 1.04 (Refer to “4-2.
  • Page 17 <Heating> (1) Rated power input of outdoor unit 3.02 kW (2) Calculation of the average indoor temperature power input coefficient Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 26.6°F [−3°C] W.B., Indoor temp. 70°F [21.1°C] D.B.) 1.16 (Refer to “4-2. CORRECTION BY TEMPERATURE”.) Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp.
  • Page 18 4-2. CORRECTION BY TEMPERATURE CITY MULTI could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. <Cooling> Figure 7 Indoor unit temperature correction To be used to correct indoor unit capacity only 60.8 62.6 64.4...
  • Page 19 <Heating> PUMY-P36/48/60 Figure 9 Indoor unit temperature correction To be used to correct indoor unit capacity only [°F D.B.] 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°C D.B.] Indoor Temperature Figure 10 Outdoor unit temperature correction To be used to correct outdoor unit capacity only Indoor Temperature 70.0°F (21.1°C) D.B.
  • Page 20 <Heating> PUMY-HP36/48 Figure 11 Indoor unit temperature correction To be used to correct indoor unit capacity only 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°F D.B.] [°C D.B.] Indoor Temperature Figure 12 Outdoor unit temperature correction To be used to correct outdoor unit capacity only Indoor Temperature 70.0°F (21.1°C) D.B.
  • Page 21 4-3. STANDARD OPERATION DATA (REFERENCE DATA) Operation PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS Operating Ambient Indoor 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F conditions temperature [26.7°C / 19.4°C] [21.1°C/15.6°C] [26.7°C/19.4°C] [21.1°C/15.6°C] [26.7°C/19.4°C] [21.1°C/15.6°C] DB/WB Outdoor 95°F/75°F 47°F / 43°F 95°F/ 75°F 47°F/43°F...
  • Page 22 4-4. STANDARD CAPACITY DIAGRAM Before calculating the sum of total capacity of indoor units, please convert the value into the kW model capacity following the formula on "4-1-1. Method for obtaining system cooling and heating capacity". 4-4-1. PUMY-P36NKMU2(-BS), PUMY-HP36NKMU <cooling> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h)
  • Page 23 4-4-2. PUMY-P36NKMU2(-BS), PUMY-HP36NKMU <heating> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH695B...
  • Page 24 4-4-3. PUMY-P48NKMU2(-BS), PUMY-HP48NKMU <cooling> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH695B...
  • Page 25 4-4-4. PUMY-P48NKMU2(-BS), PUMY-HP48NKMU <heating> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH695B...
  • Page 26 4-4-5. PUMY-P60NKMU2(-BS) <cooling> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH695B...
  • Page 27 4-4-6. PUMY-P60NKMU2(-BS) <heating> G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH695B...
  • Page 28 4-5. CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING (1) During cooling, obtain the ratio (and the equivalent piping length) of the outdoor units rated capacity and the total in-use indoor capacity, and find the capacity ratio corresponding to the standard piping length from Figure 13 to 17. Then multi- ply by the cooling capacity from Figure 7 and 8 in "4-2.
  • Page 29 Figure 15 PUMY-P36/48NKMU2(-BS), PUMY-HP36/48NKMU <Heating> Total capacity of indoor unit 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) Figure 16 PUMY-P60NKMU2(-BS) <Cooling> Total capacity of indoor unit 1.00 0.95 30 [kBtu/h] 45 [kBtu/h] 0.90 60 [kBtu/h] 0.85 0.80 78 [kBtu/h] 0.75...
  • Page 30 Figure 17 PUMY-P60NKMU2(-BS) <Heating> Total capacity of indoor unit 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) (2) Method for Obtaining the Equivalent Piping Length Equivalent length = (length of piping to farthest indoor unit) + (0.3 o number of bends in the piping) (m) 4-5-1.
  • Page 31 4-6. NOISE CRITERION CURVES PUMY-P48NKMU2 SPL(dB) MODE LINE PUMY-P36NKMU2 SPL(dB) MODE LINE PUMY-P48NKMU2-BS COOLING PUMY-P36NKMU2-BS COOLING HEATING PUMY-HP48NKMU HEATING PUMY-HP36NKMU NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR...

  • Page 32: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUMY-P36NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2 PUMY-P48NKMU2-BS PUMY-HP36NKMU Unit: mm PUMY-HP48NKMU <inch> OCH695B...
  • Page 33 PUMY-P60NKMU2 PUMY-P60NKMU2-BS Unit: mm <inch> OCH695B...

  • Page 34: Wiring Diagram

    WIRING DIAGRAM PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS SYMBOL NAME Terminal Block <Power Supply > Terminal Block <Indoor/Outdoor Transmission Line > Terminal Block <Centralized Control Transmission Line > Motor For Compressor MF1,MF2 Fan Motor 21S4 Solenoid Valve Coil <Four-Way Valve > High Pressure Switch...
  • Page 35 PUMY-P60NKMU2 PUMY-P60NKMU2-BS SYMBOL NAME Terminal Block <Power Supply > Terminal Block <Indoor/Outdoor Transmission Line > Terminal Block <Centralized Control Transmission Line > Motor For Compressor MF1,MF2 Fan Motor 21S4 Solenoid Valve Coil <Four-Way Valve > High Pressure Switch 63HS High Pressure Sensor 63LS Low Pressure Sensor Solenoid Valve Coil <Bypass Valve >...
  • Page 36 PUMY-HP36NKMU PUMY-HP48NKMU SYMBOL NAME Terminal Block <Power Supply > Terminal Block <Indoor/Outdoor Transmission Line > Terminal Block <Centralized Control Transmission Line > Motor For Compressor MF1,MF2 Fan Motor 21S4 Solenoid Valve Coil <Four-Way Valve > High Pressure Switch 63HS High Pressure Sensor 63LS Low Pressure Sensor Solenoid Valve Coil <Bypass Valve >...

  • Page 37: Necessary Conditions For System Construction

    NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH695B...
  • Page 38 5/8 <ø15.88> 3/8 <ø9.52> 3/4 <ø19.05> Outdoor unit P36, P48, HP36, HP48 3/8 <ø9.52> 5/8 <ø15.88> 3/8 <ø9.52> 3/4 <ø19.05> PUMY-P36NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2 PUMY-P48NKMU2-BS Refrigerant flow in cooling Refrigerant flow in heating Thermistor (TH7) Check valve <Ambient> <High pressure> Service port...
  • Page 39 PUMY-P60NKMU2 PUMY-P60NKMU2-BS Refrigerant flow in cooling Refrigerant flow in heating Thermistor (TH7) Check valve <Ambient> <High pressure> Service port 4-way valve Strainer Refrigerant Gas pipe Ball valve Solenoid Oil separator Check valve valve (SV1) High pressure sensor (63HS) <Low pressure> Distributor Strainer Capillary...
  • Page 40 7-4. SYSTEM CONTROL 7-4-1. Example for the System • Example for wiring control cables, wiring method and address setting, permissible lengths, and the prohibited items are listed in the standard system with detailed explanation. A. Example of an M-NET remote controller system (address setting is necessary.) Example of wiring control cables Wiring Method and Address Setting a.
  • Page 41 • Name, Symbol and the Maximum Remote controller Units for Connection Name Symbol Maximum units for connection — Outdoor unit M-NET control M-IC Refer to "3. SPECIFICATIONS". Indoor unit M-NET remote M-NET RC Maximum 2 M-NET RC for 1 indoor unit, Maximum 12 M-NET RC for 1 OC controller Permissible Lengths Constraint items...
  • Page 42 B. Example of a group operation system with 2 or more outdoor units and an M-NET remote controller. (Address settings are necessary.) (51) M-IC M-IC M-IC M-IC (01) (02) (05) (06) M1 M2 S M1 M2 S M1 M2 S M1 M2 S M1 M2 S M1 M2 S...
  • Page 43 • Name, Symbol, and the Maximum Units for Connection • Longest length via outdoor units: L [ 1640 ft [500 m] (AWG 16 [1.25 mm² ]) • Longest transmission cable length: L [ 656 ft [200 m] (AWG 16 [1.25 mm²]) •...
  • Page 44 C. Example of a MA remote controller system (address setting is not necessary.) NOTE: In the case of same group operation, need to set the address that is only main M-NET control indoor unit. Example of wiring control cables Wiring Method and Address Setting 1.
  • Page 45 Permissible Lengths Prohibited items The MA remote controller and the M-NET remote controller cannot be used together with Longest transmission cable length: the M-NET control indoor unit of the same group. [ 656 ft [200 m] (AWG 16 [1.25 mm²]) MA remote controller cable length: [ 656 ft [200 m] (AWG 22 (00)
  • Page 46 D. Example of a group operation with 2 or more outdoor units and an MA remote controller. (Address settings are necessary.) M-IC M-IC M-IC M-IC (51) (01) (02) (05) (06) TB15 TB15 TB15 TB15 M1 M2 S M1 M2 S M1 M2 S M1 M2 S M1 M2 S...
  • Page 47 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L and L [1640 ft [500 m] (AWG 16 [1.25 mm²] or more) Longest transmission cable length (M-NET cable): L and L and L and L [656 ft [200 m] (AWG 16 [1.25 mm²] or more) MA Remote controller cable length: m...

  • Page 48: Troubleshooting

    TROUBLESHOOTING 8-1. CHECKPOINTS FOR TEST RUN 8-1-1. Procedures before test run (1) Before a test run, make sure that the following work is completed. • Installation related: Make sure that the panel of cassette type and electrical wiring are done. Otherwise electrical functions like auto vane will not operate normally.
  • Page 49 8-1-1-2. Test run for wired remote controller <PAR-3 MAA> MENU RETURN SELECT ON/OFF Function buttons Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Test run" with the F1 or F2 button, and press the button.
  • Page 50 8-1-2. Countermeasures For Error During Test Run • If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the air conditioning system will automatically cease operating. Determine the nature of the abnormality and apply corrective measures. Detected Unit Check Check...
  • Page 51 8-1-3. SELF-DIAGNOSIS ACTION BY FLOWCHART Check code Serial communication error 0403 (Ed) Abnormal points and detection methods Causes and checkpoints If serial communication between the outdoor controller board and outdoor Wire breakage or contact failure of connector CN2 or power board is defective. Malfunction of power board communication circuit on outdoor controller board Malfunction of communication circuit on outdoor...
  • Page 52 Check code Compressor temperature trouble 1102 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints (1) If TH4 falls into following temperature conditions; Malfunction of stop valve Over-heated compressor operation caused by ●exceeds 230°F [110 ] continuously for 5 minutes shortage of refrigerant ●exceeds 257°F[125 ] Defective thermistor...
  • Page 53 Check code Compressor temperature trouble 1102 (U2) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Disconnect the thermistor wiring to check the resistance.
  • Page 54 Check code High pressure trouble 1302 (UE) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints (1) High pressure abnormality (63H operation) Defective operation of stop valve (not fully open) If 63H operates(*) during compressor operation. (*602 PSIG [4.15 Clogged or broken pipe MPaG]) Malfunction or locked outdoor fan motor...
  • Page 55 Check code High pressure trouble 1302 (UE) Chart 2 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the indoor unit filter clogged? Clean the filter.
  • Page 56 Check code High pressure trouble 1302 (UE) Chart 3 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the TH7. Disconnect the indoor LEV wiring to check the resistance.
  • Page 57 Check code High pressure trouble 1302 (UE) Chart 4 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the SV1. Is the connector for outdoor controller board 63H disconnected or Reconnect the connector or connect it tightly.
  • Page 58 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If the discharge superheat is continuously detected −27°F [−15 ](*) or less Disconnection or loose connection of TH4 for 5 minutes even though the indoor LEV has minimum open pulse after Defective holder of TH4 the compressor starts operating for 10 minutes.
  • Page 59 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the indoor LEV.
  • Page 60 Check code Refrigerant shortage trouble 1501 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints (1) When all of the following conditions have been satisfied for 15 Defective operation of stop valve (not fully open) consecutive minutes: Defective thermistor 1.
  • Page 61 Check code Refrigerant shortage trouble 1501 (U2) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the thermistor. Check the 63HS voltage.
  • Page 62 Check code Closed valve in cooling mode 1501 (U2) Abnormal points and detection methods Causes and checkpoints If stop valve is closed during cooling operation. Outdoor liquid/gas valve is closed. Mulfunction of outdoor LEV (LEV-A) (blockage) When both of the following temperature conditions have been satisfied for 20 minutes or more during cooling operation.
  • Page 63 Check code 4-way valve trouble in heating mode 1508 (EF) Abnormal points and detection methods Causes and checkpoints If 4-way valve does not operate during heating operation. 4-way valve failure Disconnection or failure of 4-way valve coil When any of the following temperature conditions is satisfied for 3 minutes Clogged drain pipe or more during heating operation when the outdoor temperature is −4°F Disconnection or loose connection of connectors...
  • Page 64 Check code Out-of-range outside air temperature 3121 Abnormal points and detection methods Causes and checkpoints When the thermistor temperature of -17°F[-27°C] or below has Outdoor air temperature continuously been detected for 3 minutes during heating operation Thermistor failure (during compressor operation), the unit makes an error stop and "3121" Wire failure appears on the LED1 and LED2.
  • Page 65 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of DC bus or compressor is detected before 30 seconds Closed stop valve after the compressor starts operating. Decrease of power supply voltage Looseness, disconnection, or wrong phase of compressor wiring connection...
  • Page 66 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Connect the compressor wiring (U, V and Are they connected properly? W phase) properly, then turn the power back ON.
  • Page 67 Check code Compressor overcurrent interruption 4210 (UP) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of DC bus or compressor is detected after 30 seconds since Closed outdoor stop valve the compressor starts operating. Decrease of power supply voltage Looseness, disconnection, or wrong phase of compressor wiring connection...
  • Page 68 Check code Compressor overcurrent interruption 4210 (UP) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Connect the compressor wiring (U, V and Are they connected properly? W phase) properly, then turn the power back ON.
  • Page 69 Check code Voltage shortage/Overvoltage/PAM error/L1 open-phase/ 4220 Primary current sensor error/Power synchronization signal error (U9) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If any of following symptoms are detected; Decrease/increase of power supply voltage. Primary current sensor failure ●Decrease of DC bus voltage to 200 V Disconnection of compressor wiring ●Increase of DC bus voltage to 400 V...
  • Page 70 Check code Voltage shortage/Overvoltage/PAM error/L1 open-phase/ 4220 Primary current sensor error/Power synchronization signal error (U9) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting The black square (■) indicates a switch position. any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page.
  • Page 71 Check code Heat sink temperature trouble 4230 (U5) Abnormal points and detection methods Causes and checkpoints If TH8 detects a temperature outside the specified range during Blocked outdoor fan compressor operation. Malfunction of outdoor fan motor Blocked airflow path TH8: Thermistor <Heat sink> Rise of ambient temperature Characteristic defect of thermistor Malfunction of input circuit on outdoor power board...
  • Page 72 Check code Power module trouble 4250 (U6) Abnormal points and detection methods Causes and checkpoints If both of the following conditions have been satisfied: Short-circuit caused by looseness or disconnection of compressor wiring 1. Overcurrent of DC bus or compressor is detected during compressor operation.
  • Page 73 Check code Fan trouble 4400 (U8) Abnormal points and detection methods Causes and checkpoints If no rotational frequency is detected, or detected a value outside the Malfunction of fan motor specified range during fan motor operation. Disconnection of CNF connector Defective outdoor controller board ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
  • Page 74 Check code Compressor temperature thermistor (TH4) open/short 5101 (U3) <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints If TH4 detects to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled for 10 minutes after compressor Characteristic defect of thermistor starts, during defrosting operation, or for 10 minutes after returning from Defective outdoor controller board...
  • Page 75 Check code Suction pipe temperature thermistor (TH6) open/short 5102 (U4) <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints If TH6 detects to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 seconds to 10 minutes. Characteristic defect of thermistor after compressor starts, during defrosting operation, or for 10 minutes after Defective outdoor controller board...
  • Page 76 Check code Outdoor liquid pipe temperature thermistor (TH3) open/short 5105 (U4) Abnormal points and detection methods Causes and checkpoints If TH3 detects to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 seconds to 10 minutes. Characteristic defect of thermistor after compressor starts, during defrosting operation, or for 10 minutes after Defective outdoor controller board...
  • Page 77 Check code Ambient temperature thermistor (TH7) open/short 5106 (U4) Abnormal points and detection methods Causes and checkpoints If TH7 detects to be open/short Disconnection or contact failure of connectors Open: −40°F [−40:] or less Characteristic defect of thermistor Short: 194°F [90:] or more TH7: Thermistor <Ambient>...
  • Page 78 Check code HIC pipe temperature thermistor (TH2) open/short 5109 (U4) Abnormal points and detection methods Causes and checkpoints If TH2 detects to be open/short. Disconnection or contact failure of connectors Open: −40°F [−40:] or less Characteristic defect of thermistor Short: 194°F [90:] or more TH2: Thermistor <HIC pipe>...
  • Page 79 Check code Heat sink temperature thermistor(TH8) open/short 5110 (U4) Abnormal points and detection methods Causes and checkpoints If TH8 detects to be open/short. Disconnection or contact failure of connectors Open: −31.2°F [−35.1 ] or less Characteristic defect of thermistor Short: 338.5°F [170.3 ] or more Defective outdoor controller board TH8: Thermistor <Heat sink>...
  • Page 80 Check code High pressure sensor (63HS) trouble 5201 (F5) Abnormal points and detection methods Causes and checkpoints When the detected pressure in the high pressure sensor is 14 PSIG or Defective high pressure sensor less during operation, the compressor stops operation and enters into Decrease of internal pressure caused by gas an anti-restart mode for 3 minutes.
  • Page 81 Check code Low pressure sensor (63LS) trouble 5202 (F3) Abnormal points and detection methods Causes and checkpoints When the detected pressure in the low pressure sensor is −33 PSIG Defective low pressure sensor Decrease of internal pressure caused by gas or less, or 329 PSIG or more during operation, the compressor stops leakage operation with a check code <5202>.
  • Page 82 Check code Primary current error 5300 (UH) Abnormal points and detection methods Causes and checkpoints If any of the following conditions is detected: Decrease/trouble of power supply voltage 1 Primary current sensor detects any of the following conditions (single Disconnection of compressor wiring phase unit only): Current sensor trouble on outdoor power circuit board...
  • Page 83 Check code Duplex address error 6600 (A0) Abnormal points and detection methods Causes and checkpoints If 2 or more units with the same address are existing. There are 2 units or more with the same address in their controller among outdoor unit, indoor unit, Fresh Master, Lossnay or remote controller Noise interference on indoor/outdoor connectors ●Diagnosis of defects...
  • Page 84 Check code Transmission processor hardware error 6602 (A2) Abnormal points and detection methods Causes and checkpoints If the transmission line shows "1" although the transmission processor A transmitting data collision occurred because of a transmitted "0". wiring work or polarity change has performed while the power is ON on either of the indoor/outdoor unit, Fresh Master or Lossnay Malfunction of transmitting circuit on transmission...
  • Page 85 Check code Transmission bus BUSY error 6603 (A3) Abnormal points and detection methods Causes and checkpoints An abnormality when no transmission status caused by transmitting The transmission processor is unable to transmit data collision continues for 8 to 10 minutes. due to a short-cycle voltage such as noise is mixed An abnormality when data cannot be output on the transmission line on the transmission line.
  • Page 86 Check code Signal communication error with transmission processor 6606 (A6) Abnormal points and detection methods Causes and checkpoints If the data of unit/transmission processor were not normally transmitted. Accidental disturbance such as noise or lightning surge If the address transmission from the unit processor was not normally Hardware malfunction of transmission processor transmitted.
  • Page 87 Check code No ACK error 6607 (A7) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints Represents a common error detection The previous address unit does not exist since An abnormality detected by the sending side controller when receiving the address switch was changed while in electric no ACK from the receiving side, though signal was once sent.
  • Page 88 Check code No ACK error 6607 (A7) Chart 2 of 4 Abnormal points and detection methods Causes and checkpoints The cause of displayed address and attribute is on the Fresh Master While the indoor unit is operating with multi side. refrigerant system Fresh Master, an abnormality An abnormality detected by the indoor unit if receiving no ACK when is detected when the indoor unit transmits signal...
  • Page 89 Check code No ACK error 6607 (A7) Chart 3 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Procedure 1: Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 2 minutes or more, then turn the power back ON.
  • Page 90 Check code No ACK error 6607 (A7) Chart 4 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Apply the correct kind of transmission line, Is the correct kind of transmission then perform the procedure 1.
  • Page 91 Check code No response frame error 6608 (A8) Abnormal points and detection methods Causes and checkpoints If receiving no response command while already received ACK. Continuous failure of transmission due to noise etc The sending side searches the error in 30 seconds interval for 6 times Decline of transmission voltage/signal caused by continuously.
  • Page 92 Check code MA communication receive error 6831, 6834 (E0/E4) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit: Contact failure of remote controller wirings Irregular Wiring When the main or sub remote controller cannot receive signal from (A wiring length, number of connecting remote indoor unit which has the "0"...
  • Page 93 Check code MA communication receive error 6831, 6834 (E0/E4) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".
  • Page 94 Check code MA communication send error 6832, 6833 (E3/E5) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit. There are 2 remote controllers set as main. Malfunction of remote controller sending/receiving circuit Malfunction of sending/receiving circuit on indoor controller board...
  • Page 95 Check code MA communication send error 6832, 6833 (E3/E5) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".
  • Page 96 Check code Total capacity error 7100 (EF) Abnormal points and detection methods Causes and checkpoints When the total capacity of connected indoor units exceeds the specified The total capacity of connected indoor units exceeds capacity (130% of the outdoor unit capacity), a check code <7100> is the specified capacity.
  • Page 97 Check code Capacity code error 7101 (EF) Abnormal points and detection methods Causes and checkpoints When the capacity of connected indoor unit is over, a check code <7101> The model name of connected indoor unit (model code) is displayed. is read as incompatible. The connectable indoor units are: ·P36, P48, HP36, HP48 model: P05 to P54 model (code 3 to 28)
  • Page 98 Check code Connecting excessive number of units 7102 (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor units exceed the limit, a check code <7102> is Connecting more indoor units than the limit. displayed. Abnormal if connecting status does not comply with the following limit;...
  • Page 99 Check code Address setting error 7105 (EF) Abnormal points and detection methods Causes and checkpoints The address setting of outdoor unit is wrong. Wrongly set address The outdoor unit is not set in 000, or in the range of 51 to 100.
  • Page 100 Check code Incompatible unit combination error 7130 (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor unit is not compatible with the outdoor unit, Connecting indoor unit(s) which is not authorized to the outdoor unit detects the error at startup. connect to the outdoor unit.
  • Page 101 8-2. REMOTE CONTROLLER DIAGNOSIS For the detailed procedure, refer to the remote controller's manuals. 8-3. REMOTE CONTROLLER TROUBLE For the troubleshooting, refer to the remote controller's manuals. 8-4. THE FOLLOWING SYMPTOM DO NOT REPRESENT TROUBLE (EMERGENCY) Symptom Display of remote controller CAUSE Even the cooling (heating) "Cooling (Heating)"...
  • Page 102 8-5. INTERNAL SWITCH FUNCTION TABLE PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU ■ The black square ( ) indicates a switch position. Continue to the next page OCH695B...
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  • Page 104 8-6. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR State (CN51) A Distant control board E Lamp power supply B Relay circuit F Procure locally C External output adapter G Max. 10m CN51 (PAC-SA88HA-E) D Outdoor unit control board : Error display lamp : Compressor operation lamp X, Y: Relay (Coil standard of 0.9W or less for 12 V DC) X, Y: Relay (1 mA DC) Auto change over (CN3N)
  • Page 105 8-7. HOW TO CHECK THE PARTS PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU Parts name Check points Thermistor (TH2) Disconnect the connector then measure the resistance with a tester. <Hic pipe> (At the ambient temperature 50 to 80°F [10 to 30:]...
  • Page 106 Check method of DC fan motor (fan motor/outdoor multi controller circuit board) Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor multi controller circuit board and fan motor.) Self check...
  • Page 107 Check method of multi controller circuit board Multi controller circuit board check Fuse check Check the fuse on multi controller circuit board (blow) Disconnect the FAN motor connector and Replace the multi controller circuit board and the Did the fuse (F500) blow? measure the resistance of connector pins.
  • Page 108 Check method of power circuit board Power circuit board check Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
  • Page 109 Check method of M-NET power circuit board M-NET power circuit board check * To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Check the voltage between M1 and M2 on the transmission terminal block TB3.
  • Page 110 8-8. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Hic pipe> (TH2) • Thermistor <Outdoor liquid pipe> (TH3) • Thermistor <Suction pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 k" ± 3 % B constant = 3480 ±...
  • Page 111 <LOW PRESSURE SENSOR> • Comparing the Low Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low pressure sensor appears on the LED1 on the control board. The figure at left shows that the switches 1 through 4 are set to ON and 5 through 8 are set to OFF.
  • Page 112 <HIGH PRESSURE SENSOR> • Comparing the High Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high pressure sensor appears on the LED1, 2 on the control board. The figure at left shows that the switches 1 through 4 are set to ON and 5 through 8 are set to OFF.
  • Page 113 8-9. TEST POINT DIAGRAM Outdoor multi controller circuit board PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU <CAUTION> TEST POINT 1 is high voltage. CN51 External signal Model selection Pump down Test run Manual defrost Model selection output CN102 Connect to the M-NET...
  • Page 114 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUMY-P36NKMU2 Measure the resistance in the following points (connectors, etc.). PUMY-P36NKMU2-BS 1. Check of POWER MODULE PUMY-P48NKMU2 1 Check of DIODE circuit PUMY-P48NKMU2-BS...
  • Page 115 M-NET power circuit board PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU Connect to the outdoor multi controller circuit board (CN102) 1–2: 24–30 V DC 3–4: 24–30 V DC Connect to the electrical parts box • Connect to the outdoor power circuit board (CNAC1) 1–3 : 208/230 V AC...
  • Page 116 8-10. OUTDOOR UNIT FUNCTIONS SW: setting 0..OFF 1..ON OCH695B...
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  • Page 124: Electrical Wiring

    ELECTRICAL WIRING This chapter provides an introduction to electrical wiring for MULTI-S series, together with notes concerning power wiring, wir- ing for control (transmission wires and remote controller wires), and the frequency converter. 9-1. OVERVIEW OF POWER WIRING Use a separate power supply for the outdoor unit and indoor unit. Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
  • Page 125 9-2-2. Cross section area of Wire for Main Power and ON/OFF capacities PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS PUMY-HP36NKMU PUMY-HP48NKMU Minimum Wire Thickness Maximum rating Conduit Breaker for Breaker for Current Minimum circuit (AWG [mm2]) Power Supply of over current...
  • Page 126 9-3. DESIGN FOR CONTROL WIRING Please note that the types and numbers of control wires needed by MULTI-S series depend on the remote controllers and whether they are linked with the system or not. 9-3-1. Selection number of control wires M-NET remote controller Remote controller used in system control operations •...
  • Page 127 9-5. SYSTEM SWITCH SETTING In order to identify the destinations of signals to the outdoor units, indoor units, and remote controller of MULTI-S series, each microprocessor must be assigned an identification number (address). The addresses of outdoor units, indoor units, and remote controller must be set using their settings switches.
  • Page 128 9-7. METHOD FOR OBTAINING ELECTRICAL CHARACTERISTICS WHEN A CAPACITY AGREEMENT IS TO BE SIGNED WITH AN ELECTRIC POWER COMPANY The electrical characteristics of connected indoor unit system for air conditioning systems, including MULTI-S series, depend on the arrangement of the indoor and outdoor units. First read the data on the selected indoor and outdoor units and then use the following formulas to calculate the electrical characteristics before applying for a capacity agreement with the local electric power company.

  • Page 129: Refrigerant Piping Tasks

    REFRIGERANT PIPING TASKS 10-1. REFRIGERANT PIPING SYSTEM 10-1-1. PUMY-(H)P36/48 Outdoor Unit First Branch Indoor unit Line-Branch Method Connection Examples (Connecting to 4 Indoor Units) Total Piping Length A+B+C+a+b+c+d [ 984 ft [300 meters] Permissible Farthest Piping Length A+B+C+d [ 492 ft [150 meters] Length Farthest Piping Length After First Branch B+C+d [ 98 ft [30 meters]...
  • Page 130 Outdoor Unit First Branch Indoor unit Header-Branch Method Connection Examples (Connecting to 4 Indoor Units) Total Piping Length A+a+b+c+d [ 984 ft [300 meters] Permissible Farthest Piping Length A+d [ 492 ft [150 meters] Length Farthest Piping Length After First Branch d is 98 ft [30 meters] The outdoor unit is upper: 164ft [50m] or less High/Low Difference...
  • Page 131 Note: Pipe re-branching after the header branching is not possible. Method of Combined Branching of Lines and Headers Connection Examples Outdoor unit (Connecting to 5 Indoor Units) First branching (branching joint) Branching joint Indoor unit Branching header Blind caps Total Piping Length A+B+C+a+b+c+d+e is 984 ft [300 meters] Permissible Farthest Piping Length...
  • Page 132 10-1-2. PUMY-P60 Line-Branch Method Connection Examples (Connecting to 4 Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+B+C+a+b+c+d [ 492 ft [150 meters] Permissible Farthest Piping Length A+B+C+d [ 262 ft [80 meters] Length Farthest Piping Length After First Branch B+C+d [ 98 ft [30 meters] High/Low Difference in Indoor/Outdoor Section 164 ft [50 meters] (If the outdoor unit is lower, 131 ft [40 meters])
  • Page 133 Header-Branch Method Connection Examples (Connecting to 4 Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+a+b+c+d [ 492 ft [150 meters] Permissible Farthest Piping Length A+d [ 262 ft [80 meters] Length Farthest Piping Length After First Branch d is 100 ft [30 meters] Permissible High/ High/Low Difference in Indoor/Outdoor Section...
  • Page 134 Note: Pipe re-branching after the header branching is not possible. Method of Combined Branching of Lines and Headers Connection Examples (Connecting to 5 Indoor Units) Outdoor unit First branching (branching joint) Branching joint Indoor unit Branching header Blind caps Total Piping Length A+B+C+a+b+c+d+e is 492 ft [150 meters] Permissible Farthest Piping Length...
  • Page 135 10-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 10-2-1. Introduction R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious. To prevent possible injury, the rooms should be large enough to keep the R410A concentration specified by ISO 5149-1 as follows.

  • Page 136: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUMY-P36NKMU2 PUMY-P48NKMU2 PUMY-P60NKMU2 PUMY-P36NKMU2-BS PUMY-P48NKMU2-BS PUMY-P60NKMU2-BS : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. Note: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES Figure 1 1. Removing the service panel and top panel...
  • Page 137 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES (6) Remove 2 electrical parts box fixing screws (4 × Photo 4 Electrical parts box 10) and detach the electrical parts box by pulling it Hook upward. The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
  • Page 138 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Outdoor liquid pipe> (TH3) Photo 8 and thermistor <Compressor> (TH4), thermistor <Hic pipe> (TH2) (1) Remove the service panel. (See Figure 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the outdoor multi controller circuit board in the electrical parts box.
  • Page 139 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1) and bypass valve Photo 10 (1) Remove the service panel. (See Figure 1) Linear expansion (2) Remove the top panel. (See Figure 1) valve coil (LEV-B) Linear (3) Remove the cover panel (front). (Refer to procedure 8 (5)) expansion (4) Remove the cover panel (rear).
  • Page 140 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 13. Removing the compressor (MC) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 3) Valve bed (4) Remove front panel fixing screws, 5 (5x12) and 2 (4 x Valve bed...
  • Page 141 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the accumulator Note: Recover refrigerant without spreading it in the air. (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove the front cover panel. (Refer to procedure 13 (3)) (4) Remove the back cover panel.
  • Page 142 PUMY-HP36NKMU PUMY-HP48NKMU : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. Note: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES Figure 1 1. Removing the service panel and top panel Top panel Top panel fixing screws (1) Remove 3 service panel fixing screws (5 ×...
  • Page 143 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES (6) Remove 2 electrical parts box fixing screws (4 × Photo 4 Electrical parts box 10) and detach the electrical parts box by pulling it Hook upward. The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
  • Page 144 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Outdoor liquid pipe> (TH3) Photo 8 and thermistor <Compressor> (TH4), thermistor <Hic pipe> (TH2) (1) Remove the service panel. (See Figure 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the outdoor multi controller circuit board in the electrical parts box.
  • Page 145 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1) and bypass valve Photo 10 (1) Remove the service panel. (See Figure 1) Switching (2) Remove the top panel. (See Figure 1) Switching Linear expansion valve coil (3) Remove the cover panel (front). (Refer to procedure 8 (5)) valve valve coil (LEV-A) (SV2)
  • Page 146 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 13. Removing the compressor (MC) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 3) (4) Remove front panel fixing screws, 5 (5x12) and 2 (4 x Valve bed 10) and remove the front panel.
  • Page 147 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the accumulator Note: Recover refrigerant without spreading it in the air. (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove the front cover panel. (Refer to procedure 13 (3)) (4) Remove the back cover panel.
  • Page 148 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021 No. OCH695 REVISED EDITION-B Issued: Mar. 2019 No. OCH695 REVISED EDITION-A Published: Nov. 2018 No. OCH695 Specifications are subject to change without notice.

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