Mitsubishi Electric PUMY-P112VKM1 Service Manual

Split-type, heat pump air conditioners

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Summary of Contents for Mitsubishi Electric PUMY-P112VKM1

Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS October 2014 No. OCH576 TECHNICAL & SERVICE MANUAL <Outdoor unit> Note: [Service Ref.] [Model Name] • This service manual PUMY-P112VKM1 PUMY-P112VKM1 describes technical data of the outdoor units only. PUMY-P125VKM1 PUMY-P125VKM1 PUMY-P140VKM1 PUMY-P140VKM1 PUMY-P112YKM1 PUMY-P112YKM1...
Page 2: Safety Precaution
SAFETY PRECAUTION 1-1. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. Avoid using thin pipes. Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc.
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) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
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. UNIT CONSTRUCTION PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) Outdoor unit PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) Capacity Type 15 to Type 125 Type 15 to Type 140 Applicable 1 to 12 unit indoor unit Number of units 1 to 9 unit 1 to 10 unit...
Page 6 2-2. UNIT CONSTRUCTION (BRANCH BOX SYSTEM) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) PUMY-P112VKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) PUMY-P112YKM1(-BS) Outdoor unit Capacity Type 15 to Type 100 Applicable Number of units 2 to 8 units indoor unit Total system wide capacity 19 to 130 % of outdoor unit capacity...
Page 7: Outdoor Unit
2-3. UNIT CONSTRUCTION (MIXED SYSTEM) Outdoor unit PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) Capacity City multi indoor unit Type 15 to Type 140 Type 15 to Type 125 Applicable Via branch box Type 15 to Type 100 indoor unit Via branch box Citymulti indoor...
Page 8: Unit Specifications
2-4. UNIT SPECIFICATIONS (1) Outdoor Unit PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) Service Ref. PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) Cooling (kW) 12.5 14.0 15.5 Capacity Heating (kW) 14.0 16.0 18.0 Compressor (kW) Cooling/Heating capacity indicates the maximum value at operation under the following condition. *Cooling Indoor : D.B.
Page 9: Specifications
Motor output 0.06+0.06 External static press. Compressor Type x Quantity Scroll hermetic compressor x 1 Manufacture Mitsubishi Electric Corporation Starting method Inverter Capacity control % Cooling 26 to 100 Cooling 24 to 00 Cooling 21 to 100 Heating 20 to 100...
Page 10 Motor output 0.06+0.06 External static press. Compressor Type x Quantity Scroll hermetic compressor x 1 Manufacture Mitsubishi Electric Corporation Starting method Inverter Capacity control % Cooling 26 to 100 Cooling 24 to100 Cooling 21 to 100 Heating 20 to 100...
Page 11: Data.
DATA 4-1. COOLING AND HEATING CAPACITY AND CHARACTERISTICS 4-1-1. Method for obtaining system cooling and heating capacity: To obtain the system cooling and heating capacity and the electrical characteristics of the outdoor unit, first add up the ratings of all the indoor units connected to the outdoor unit (see table below), and then use this total to find the standard capacity with the help of the tables on "4-3.
Page 12 4-2. STANDARD OPERATION DATA (REFERENCE DATA) Operation PUMY-P112VKM/YKM1(-BS) PUMY-P125VKM/YKM1(-BS) PUMY-P140VKM/YKM1(-BS) Indoor Ambient 27°C/ 19°C 20°C/ — 27°C/ 19°C 20°C/ — 27°C/ 19°C 20°C/ — temperature Outdoor 35°C 7°C/ 6°C 35°C 7°C/ 6°C 35°C 7°C/ 6°C No. of connected units Unit Indoor unit No.
Page 13 4-3. 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". 4-3-1. PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) <cooling> 16.0 14.0...
Page 14 PUMY-P112YKM PUMY-P112VKM Heating 4-3-2. PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) <heating> 16.0 14.0 12.0 10.0 10.0 12.0 14.0 16.0 18.0 200. Total capacity of indoor units(kW) 10.0 12.0 14.0 16.0 18.0 20.0 Total capacity of indoor units(kW) 20.0 V-Type 15.0 220V 230V 240V 10.0 10.0...
Page 15 PUMY-P125YKM PUMY-P125VKM Cooling 4-3-3. PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) <cooling> 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". 18.0 16.0 14.0 12.0...
Page 16 PUMY-P125YKM PUMY-P125VKM Heating 4-3-4. PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) <heating> 18.0 16.0 14.0 12.0 10.0 10.0 12.0 14.0 16.0 18.0 20.0 Total capacity of indoor units(kW) 10.0 12.0 14.0 16.0 18.0 20.0 Total capacity of indoor units(kW) 20.0 V-Type 15.0 220V 230V 240V 10.0 10.0 12.0...
Page 17 PUMY-P140YKM PUMY-P140VKM Cooling 4-3-5. PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) <cooling> 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". 20.0 18.0 16.0 14.0...
Page 18 PUMY-P140YKM PUMY-P140VKM Heating 4-3-6. PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) <heating> 20.0 18.0 16.0 14.0 12.0 10.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 Total capacity of indoor units(kW) 10.0 12.0 14.0 16.0 18.0 20.0 22.0 Total capacity of indoor units(kW) 25.0 V-Type 20.0 220V 230V 15.0...
Page 19: Correcting Cooling And Heating Capacity
4-4. CORRECTING COOLING AND HEATING CAPACITY 4-4-1. Correcting Changes in Air Conditions (1) The performance curve charts (Figure 1, 2) show the change ratio of capacity and input (power consumption) according to the indoor and outdoor temperature condition when defining the rated capacity (total capacity) and rated input under the standard condition in standard piping length (5 m) as “1.0”.
Page 20 4-4-2. 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 3. Then multiply by the cooling capacity from Figure 1 to obtain the actual capacity.
Page 21 4-5. NOISE CRITERION CURVES SPL(dB) MODE LINE MODE SPL(dB) LINE PUMY-P125VKM1(-BS) COOLING PUMY-P112VKM1(-BS) COOLING PUMY-P125YKM1(-BS) HEATING PUMY-P112YKM1(-BS) HEATING 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 NC-20 HEARING FOR NC-20...
Page 22: Outlines And Dimensions
OUTLINES AND DIMENSIONS PUMY-P112VKM1(-BS) Unit : mm PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) OCH576...
Page 23 PUMY-P112YKM1(-BS) Unit : mm PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) OCH576...
Page 24: Wiring Diagram
WIRING DIAGRAM PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) SYMBOL NAME LEV-A LEV-B TH7 TH6 TH3 TH4 Terminal Block <Power Supply> 63LS 63HS TB1B Terminal Block <Branch Box> MULTI. B. is the switch position. Terminal Block <Indoor/Outdoor, Branch Box/Outdoor Transmission Line> CN3D CN3S CN3N...
Page 25 PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) SYMBOL NAME LEV-A LEV-B TH7 TH6 TH3 TH4 Terminal Block <Power Supply> 63HS 63LS TB1B Terminal Block <Branch Box> MULTI. B. is the switch position. Terminal Block <Indoor/Outdoor, Branch Box/Outdoor Transmission Line> CN3D CN3S CN3N SWU2 SWU1 Terminal Block CNF1 (WHT)
Page 26: Necessary Conditions For System Construction
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH576...
Page 27 7-2. REFRIGERANT SYSTEM DIAGRAM PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VMK1(-BS) PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YMK1(-BS) Thermistor (TH7) Check valve <Ambient> <High pressure> Service port 4-way valve Strainer Refrigerant Gas pipe Ball valve High pressure Solenoid Oil separator switch (63H) valve (SV1) Distributor Strainer High pressure...
Page 28 7-3. REFRIGERANT SYSTEM DIAGRAM (WHEN USING BRANCH BOX) Condenser / evaporator temperature thermistor Room temperature (TH5 or RT12) thermistor (TH1 or RT11) Check valve Thermistor (TH7) <High pressure> <Ambient> Service port 4-way valve Strainer Ball valve High pressure Solenoid Oil separator switch (63H) valve (SV1) Distributor...
Page 29 ■ Pipe size (Branch box-Indoor unit) For M or S series Indoor unit Indoor unit type (kW) Liquid [6.35 [6.35 [6.35 [6.35 [6.35 [9.52 [6.35 [6.35 [6.35 [6.35 [9.52 Pipe size (mm) [9.52 [9.52 [9.52 [9.52 [9.52 [9.52 [9.52 [12.7 [15.88* [15.88 [15.88 *1 When using 60 type indoor unit of MEXZ series, use the flare nut in the indoor unit accessory for the gas side connecting of indoor unit.
Page 30: System Control
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 a M-NET remote controller system (address setting is necessary.) Example of wiring control cables Wiring Method and Address Setting a. Use feed wiring to connect terminals M1 and M2 on 1.
Page 31 • Name, Symbol and the Maximum Remote controller Units for Connection Name Symbol Maximum units for connection Outdoor unit — M-NET control M-IC 1 OC unit can be connected to 1 to 9 (P112)/1 to 10 (P125)/1 to 12 (P140) M-IC units 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...
Page 32 B. Example of a group operation system with 2 or more outdoor units and a M-NET remote controller. (Address settings are necessary.) (51) 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 (105)
Page 33 • Name, Symbol, and the Maximum Units for Connection • Longest length via outdoor units : L [ 500 meters (1.25 mm²) • Longest transmission cable length : L [ 200 meters (1.25 mm²) • M-NET Remote controller cable length : R [ 10 meters (0.5 to 1.25 mm²) If the length exceeds 10 meters, use a 1.25 mm² shielded wire. The length of this sec- tion (L ) should be included in the calculation of the maximum length and overall length.
Page 34 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 35 Permissible Lengths Prohibited items The MA remote controller and the Longest transmission cable length: [ 200 m (1.25 mm²) M-NET remote controller cannot be used together with the M-NET con- MA remote controller cable length: [ 200 m (0.3 to 1.25 mm²) trol indoor unit of the same group.
Page 36 D. Example of a group operation with 2 or more outdoor units and a 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 37 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L and L [ 500 m (1.25 E more) Longest transmission cable length (M-NET cable): L and L and L and L and L [ 200 m (1.25 E or more) MA Remote controller cable length: m1 and m1+m2+m3 and m1+m2+m3+m4 [ 200 m (0.3 to 1.25 E) (51)
Page 38 E. Example of a system using Branch Box and A-Control indoor unit TB3A TB3A TB15 Branch Box A-IC MA-RC (01) (51) TB3B TB3A TB15 M1 M2 S M1 M2 S A-IC MA-RC (02) TB3C TB15 TB3A A-IC MA-RC (03) (01) TB3D TB3A A-IC...
Page 39 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L1+L2+L3 and L1+L2+L3+L4+L5 [ 500 m (1.25 mm2 or more)] Longest transmission cable length (M-NET cable): L1+L2 and L3+L4 and L5 [ 200 m (1.25 mm2 or more) ] Longest transmission cable length (A-Control cable): L6 [ 25 m (1.25 mm2 or more) ] Remote controller cable length: m1 [ 200 m (0.3 to 1.25 mm2) ] TB3A...
Page 40 F. Example of a system using Branch Box, A-Control indoor unit, and M-NET Control indoor unit. TB3A TB3A TB15 Branch Box A-IC MA-RC (01) (51) TB3B TB3A TB15 M1 M2 S M1 M2 S A-IC MA-RC (02) TB3C TB3A TB15 A-IC MA-RC (03)
Page 41 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L1+L2+L3 and L1+L2+L3+L4+L5 [ 500 m (1.25 mm2 or more)] Longest transmission cable length (M-NET cable): L1+L2 and L3+L4 and L5 [ 200 m (1.25 mm2 or more) ] Longest transmission cable length (A-Control cable): L6 [ 25 m (1.25 mm2 or more) ] Remote controller cable length: m1 [ 200 m (0.3 to 1.25 mm2) ] TB3A...
Page 42: Troubleshooting
TROUBLESHOOTING 8-1. CHECK POINTS 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. • Piping related : Perform leakage test of refrigerant and drain piping.
Page 43 8-1-1-2. Test run for wired remote controller <PAR-31MAA> 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 44 8-1-2. Special Function Operation and Settings (for M-NET Remote Controller) • It is necessary to perform “group settings” and “paired settings” at making group settings of different refrigerant systems (multiple outdoor unit). (A) Group settings: Enter the indoor unit controlled by the remote controller, check the content of entries, and clear entries, etc.
Page 45 (2) Address check: Refer to section (1) regarding address entry. a) In making group settings: • Turn off the remote controller: Press the remote controller's ON/OFF button to stop operation (the indicator light will go off). • Locate the indoor unit address display mode: Press the FILTER and k buttons on the remote controller simultaneously and hold for 2 seconds. • Display indoor unit address: The entered indoor units address and type will be displayed each time the button is pressed. * When 1 entry is made, only 1 address will be displayed no matter how many times the w button is pressed. • Returning to the normal mode after completing check: Simultaneously press the FILTER and k buttons on the remote controller and hold for 2 seconds to return to the normal mode.
Page 46: Table Of Contents
8-1-3. 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 Remarks Trouble Remote code Indoor Outdoor Controller Outdoor unit outdoor multi controller circuit board – 0403 Serial communication error Power circuit board communication trouble...
Page 47: Serial Communication Error
Check code Serial communication error 0403 Abnormal points and detection methods Causes and check points Abnormal if serial communication between the outdoor multi controller Wire breakage or contact failure of connector CN2 or circuit board and outdoor power circuit board is defective. Malfunction of communication circuit to power circuit board on outdoor multi controller circuit board Malfunction of communication circuit on outdoor...
Page 48 Check code Compressor temperature trouble 1102 Chart 1 of 2 Abnormal points and detection methods Causes and check points (1) Abnormal if TH4 falls into following temperature conditions; Malfunction of stop valve Over-heated compressor operation caused by ●exceeds 110 [230°F] continuously for 5 minutes shortage of refrigerant ●exceeds 125 [257°F] Defective thermistor Defective outdoor multi controller circuit board (2) Abnormal if a pressure detected by the high-pressure sensor and LEV performance failure converted to saturation temperature exceeds 40 [104°F]during...
Page 49 Check code Compressor temperature trouble 1102 Chart 2 of 2 ●Diagnosis of defectives 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. Is there a resistance detected? Replace the thermistor.
Page 50 Check code Low pressure trouble 1300 Chart 1 of 3 Abnormal points and detection methods Causes and check points <63L equipped model> Defective operation of stop valve (not fully open) (1) Low pressure (63L is in operation) Clogged or broken pipe. Abnormal if 63L operates (under-0.03MPa) during compressor Malfunction or locked outdoor fan motor operation.
Page 51 Check code Low pressure trouble 1300 Chart 2 of 3 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there dirt on the indoor heat Wash the indoor heat exchanger. exchanger? (dirty) (no dirt)
Page 52 Check code Low pressure trouble 1300 Chart 3 of 3 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Check the resistance of SV1. Replace the SV1. Is there a resistance detected? <63L equipped model> Is the connector for outdoor multi controller circuit board 63L Reconnect the connector or connect it tightly.
Page 53 Check code High pressure trouble 1302 Chart 1 of 4 Abnormal points and detection methods Causes and check points <63H equipped model (63HS non-equipped)> Defective operation of stop valve (not fully open) (1) High pressure abnormality (63H operation) Clogged or broken pipe. Abnormal if 63H operates(*) during compressor operation.
Page 54 Check code High pressure trouble 1302 Chart 2 of 4 ●Diagnosis of defectives 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. (Clogged filter) (No clog) Is there dirt on the indoor heat Wash the indoor heat exchanger.
Page 55 Check code High pressure trouble 1302 Chart 3 of 4 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the TH7. Disconnect the indoor LEV wiring to check the resistance.
Page 56 Check code High pressure trouble 1302 Chart 4 of 4 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Replace the SV1. Is there a resistance detected? <63H equipped model (63HS non-equipped)> Is the connector for outdoor multi controller circuit board 63H Reconnect the connector or connect it tightly.
Page 57 Check code Superheat due to low discharge temperature trouble 1500 Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if the discharge superheat is continuously detected less than Disconnection or loose connection of TH4 or equal to −15 [5°F]* for 5 minutes even though the indoor LEV has Defective holder of TH4 minimum open pulse after the compressor starts operating for 10 minutes.
Page 58 Check code Superheat due to low discharge temperature trouble 1500 Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Replace the indoor LEV. Is there a resistance detected? Check the voltage and appearance of the indoor controller board.
Page 59 Check code Refrigerant shortage trouble 1501 Chart 1 of 2 Abnormal points and detection methods Causes and check points (1) Abnormal when all of the following conditions are satisfied: Defective operation of stop valve (not fully open) 1. The compressor is operating in HEAT mode Defective thermistor 2.Discharge super heat is 80 or more.
Page 60 Check code Refrigerant shortage trouble 1501 Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the thermistor. Check the 63HS voltage.
Page 61: Blocked Valve In Cooling Mode
Check code Blocked valve in cooling mode 1501 Abnormal points and detection methods Causes and check points Abnormal if stop valve is blocked during cooling operation. Outdoor liquid/gas valve is blocked. Mulfunction of outdoor LEV (LEV1)(blockage) Abnormal when both of the following temperature conditions are satisfied for 20 minutes or more during cooling operation. 1. TH22j−TH21j ] −2°C 2. TH23j−TH21j ] −2°C TH21: Indoor intake temperature thermistor...
Page 62: Way Valve Trouble In Heating Mode
Check code 4-way valve trouble in heating mode 1508 Abnormal points and detection methods Causes and check points Abnormal if 4-way valve does not operate during heating operation. 4-way valve failure Disconnection or failure of 4-way valve coil Abnormal when any of the following temperature conditions is satisfied for Clogged drain pipe 3 min.
Page 63 Check code Water leakage 2500 Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if drain sensor or float switch detects to be in the water during Reverse connection of extended piping (when cooling or dry operation. connecting multiple units) Reverse connection of indoor/ outdoor connector To release this abnormality, reset the power (turn OFF and ON). Defective thermistor of TH21 or TH22/23 Defective drain sensor or float switch TH21: Indoor intake temperature thermistor...
Page 64 Check code Check code Water leakage 2500 Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy Continued from the previous page ●Is there an adhesion of water drops on the drain sensor? ●Is there a difficulty when Solve the problem.
Page 65 Check code <Drain sensor models> Drain overflow protection Check cod 2502 Chart 1 of 3 Abnormal points and detection methods Causes and check points Drain pump (DP) 1 Malfunction of drain pump 1Let drain sensor self-heated, and if temperature rises slightly, as 2 Defective drain suspensive abnormality operation stops and changes to protect mode of Clogged drain pump...
Page 66 Check code <Drain sensor models> Drain overflow protection 2502 Chart 2 of 3 ●Diagnosis of defectives 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 of drain Replace the drain sensor. sensor normal? <How to check the resistance>...
Page 67 Check code <Drain sensor models> Drain overflow protection 2502 Chart 3 of 3 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Check the voltage on both ends of the branch connector. Check the branch connector for breakage Is 200 V AC output? or contact failure.
Page 68 Check code <Float switch models> Drain overflow protection 2502 Chart 1 of 2 Abnormal points and detection methods Causes and check points Drain pump (DP) 1 Malfunction of drain pump 1Judge whether the sensor is in the water or in the air by turning the float 2 Defective drain switch ON/OFF. Clogged drain pump In the water: Detected that the float switch is ON for 15 seconds. Clogged drain pipe In the air: Detected that the float switch is OFF for 15 seconds.
Page 69 Check code Check code <Float switch models> Drain overflow protection 2502 Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a difficulty on the Solve the problem. moving part when pulling up ·...
Page 70 Check code <Drain sensor models> Drain sensor abnormality 2503 Abnormal points and detection methods Causes and check points <Drain sensor models> Contact failure of connector CN31 Abnormal if drain sensor detects to be short/ open . Characteristic defect of thermistor Breakage or contact failure of drain sensor wiring.
Page 71 Check code Compressor current interruption (Locked compressor) 4100 Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if overcurrent of compressor is detected within 30 seconds after Closed stop valve the compressor starts operating. Decrease of power supply voltage Looseness, disconnection or converse of compressor wiring connection Model selection error upon replacement of indoor...
Page 72 Check code Compressor current interruption (Locked compressor) 4100 Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Set the model selection switch correctly, Are they set properly? then restart.
Page 73 Check code Compressor overcurrent interruption 4210 Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if overcurrent of compressor is detected after 30 seconds since Closed outdoor stop valve the compressor starts operating. Decrease of power supply voltage Looseness, disconnection or reverse phase of compressor wiring connection Malfunction of indoor/outdoor fan...
Page 74 Check code Compressor overcurrent interruption 4210 Chart 2 of 2 ●Diagnosis of defectives 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 W phase) properly, then turn the power Are they connected properly? back ON.
Page 75 Check code Undervoltage/Overvoltage/PAM error/L1 open-phase/ 4220 Power synchronization signal error Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if any of following symptoms are detected; Decrease/increase of power supply voltage, or T open-phase 1 P112/125/140V model Disconnection of compressor wiring ●Decrease of DC bus voltage to 200 V ●Increase of DC bus voltage to 400 V Malfunction of 52C ●DC bus voltage stays at 310V or lower for censecutive 10 seconds Disconnection or contact failure of CN52C Defective outdoor power circuit board...
Page 76 Check code Undervoltage/Overvoltage/PAM error/L1 open-phase/ 4220 Power synchronization signal error Chart 2 of 2 ●Diagnosis of defectives 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 Is CN5 connected properly Correct the CN5 wiring.
Page 77 Check code Heat sink temperature trouble 4230 Abnormal points and detection methods Causes and check points Abnormal if TH8 detects a temperature outside the specified range during Blocked outdoor fan compressor operation. Malfunction of outdoor fan motor Blocked airflow path Thermistor <Heat sink> TH8: Rise of ambient temperature Characteristic defect of thermistor Malfunction of input circuit on outdoor power circuit board Malfunction of outdoor fan driving circuit ●Diagnosis of defectives...
Page 78 Check code Power module trouble 4250 Abnormal points and detection methods Causes and check points Abnormal if overcurrent of DC bus or compressor is detected 30 seconds Closed outdoor stop valve after the compressor starts operating. To determine the source of Decrease of power supply voltage abnormality, either the compressor or the power module, drive the power Disconnection, looseness or conversed connection...
Page 79 Check code Rotational frequency of outdoor fan motor trouble 4400 Abnormal points and detection methods Causes and check points Abnormal if no rotational frequency is detected, or detected a value Malfunction of fan motor outside the specified range during fan motor operation. Disconnection of CNF connector Defective outdoor multi controller circuit board ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Page 80: Compressor Temperature Thermistor (Th4) Open/Short
Check code Compressor temperature thermistor (TH4) open/short 5101 <Detected in outdoor unit> Abnormal points and detection methods Causes and check points Abnormal 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 multi controller circuit board...
Page 81: Suction Pipe Temperature Thermistor (Th6) Open/Short
Check code Suction pipe temperature thermistor (TH6) open/short 5102 <Detected in outdoor unit> Abnormal points and detection methods Causes and check points Abnormal if TH6 detects to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 sec. to 10 min. after Characteristic defect of thermistor compressor starts, during defrosting operation, or for 10 min.
Page 82 Check code Air inlet thermistor trouble (TH21) Liquid pipe temperature thermistor trouble (TH22) 5101, 5102, 5103 Gas pipe temperature thermistor trouble (TH23) <Detected in indoor unit> Abnormal points and detection methods Causes and check points Abnormal if any of the following thermistor detected to be open/ short. Contact failure of connectors Characteristic defect of thermistor TH21: Air inlet thermistor...
Page 83: Outdoor Liquid Pipe Temperature Thermistor (Th3) Open/Short
Check code Outdoor liquid pipe temperature thermistor (TH3) open/short 5105 Abnormal points and detection methods Causes and check points Abnormal if TH3 detects to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 sec. to 10 min. after Characteristic defect of thermistor compressor starts, during defrosting operation, or for 10 min.
Page 84: Ambient Thermistor (Th7) Open/Short
Check code Ambient thermistor (TH7) open/short 5106 Abnormal points and detection methods Causes and check points Abnormal if TH7 detects to be open/short Disconnection or contact failure of connectors Open:−40 or less Characteristic defect of thermistor Short: 90 or more TH7: Thermistor <Ambient>...
Page 85: Hic Pipe Temperature Thermistor (Th2) Open/Short
Check code HIC pipe temperature thermistor (TH2) open/short 5109 Abnormal points and detection methods Causes and check points Abnormal if TH2 detects to be open/short. Disconnection or contact failure of connectors Open:−40 or less Characteristic defect of thermistor Short: 90 or more TH2: Thermistor <HIC pipe>...
Page 86 Check code Heat sink temperature thermistor(TH8) open/short 5110 Abnormal points and detection methods Causes and check points Abnormal if TH8 detects to be open/short. Disconnection or contact failure of connectors P112/125/140V model <Internal thermistor> Characteristic defect of thermistor Open: −35.1 or less Defective outdoor multi controller circuit board Short: 170.3 or more 2P112/125/140Y model Open: −34.8 or less...
Page 87 Check code High-pressure sensor (63HS) trouble 5201 Abnormal points and detection methods Causes and check points When the detected pressure in the high-pressure sensor is 1kgf/F 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 88 Check code Low-pressure sensor (63LS) trouble 5202 Abnormal points and detection methods Causes and check points When the detected pressure in the low-pressure sensor is −2.3kgf/F Defective low-pressure sensor or less, or 23.1kgf/F or more during operation, the compressor stops Decrease of internal pressure caused by gas operation with a check code <5202>. leakage For 3 minutes after compressor restarting, during defrosting operation, Disconnection or contact failure of connector...
Page 89 Check code Primary current error 5300 Abnormal points and detection methods Causes and check points Abnormal if the detected current sensor input value (primary current) Decrease/ trouble of power supply voltage during compressor operation is outside the specified range. Disconnection of compressor wiring Input sensor trouble on outdoor power circuit board ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Page 90 Check code Models equipped with the float switch Contact failure of drain float switch 5701 Abnormal points and detection methods Causes and check points <Models equipped with the float switch> Contact failure of connector CN4F Abnormal if the connector on the drain float switch side CN4F is detected Defective indoor controller board to be disconnected. ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy <Models equipped with the float switch>...
Page 91: Duplex Address Error
Check code Duplex address error 6600 Abnormal points and detection methods Causes and check points Abnormal 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 defectives...
Page 92 Check code Transmission processor H/W error 6602 Abnormal points and detection methods Causes and check points Abnormal if the transmission line shows "1" although the transmission A transmitting data collision occurred because of a processor 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 93: Transmission Bus Busy Error
Check code Transmission bus BUSY error 6603 Abnormal points and detection methods Causes and check points Over error by collision The transmission processor is unable to transmit due Abnormal if no-transmission status caused by a transmitting data to a short-cycle voltage such as noise is mixed on collision is consecutive for 8 to 10minutes.
Page 94: Signal Communication Error With Transmission Processor
Check code Signal communication error with transmission processor 6606 Abnormal points and detection methods Causes and check points Abnormal if the data of unit/transmission processor were not normally Accidental disturbance such as noise or lightning transmitted. surge Hardware malfunction of transmission processor Abnormal if the address transmission from the unit processor was not normally transmitted.
Page 95 Check code No ACK error 6607 Chart 1 of 4 Abnormal points and detection methods Causes and check points 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.The continuity status.
Page 96 Check code No ACK error 6607 Chart 2 of 4 Abnormal points and detection methods Causes and check points While the indoor unit is operating with multi refrigerant system Fresh Master, an abnormality The cause of displayed address and attribute is on the Fresh Master is detected when the indoor unit transmits signal side to the remote controller while the outdoor unit with...
Page 97 Check code No ACK error 6607 Chart 3 of 4 ●Diagnosis of defectives 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 98 Check code No ACK error 6607 Chart 4 of 4 ●Diagnosis of defectives 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 99: No Response Frame Error
Check code No response frame error 6608 Abnormal points and detection methods Causes and check points Abnormal 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 100 Check code MA communication receive error 6831 6834 Chart 1 of 2 Abnormal points and detection methods Causes and check points 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 101 Check code MA communication receive error 6831 6834 Chart 2 of 2 ●Diagnosis of defectives 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". Connect the wiring properly as specified in Is the wiring connected the chapter "Electrical Work"...
Page 102 Check code MA communication send error 6832 6833 Chart 1 of 2 Abnormal points and detection methods Causes and check points 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 103 Check code MA communication send error 6832 6833 Chart 2 of 2 ●Diagnosis of defectives 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". Connect the wiring properly as specified in Is the wiring connected the chapter "Electrical Work"...
Page 104: Total Capacity Error
Check code Total capacity error 7100 Abnormal points and detection methods Causes and check points When the total of the number on connected indoor unit model names The total of number on connected indoor unit model exceeds the specified capacity level (130% of the number on the outdoor names exceeds the specified capacity level unit model name), a check code <7100> is displayed. ·P112 model: up to code 35 ·P125 model: up to code 41 ·P140 model: up to code 47...
Page 105: Capacity Code Error
Check code Capacity code error 7101 Abnormal points and detection methods Causes and check points When a connected indoor unit is incompatible, a check code <7101> is The model name of connected indoor unit (model code) displayed. is read as incompatible. The connectable indoor units are: ·P112 to P140 model: P15 to P140 model (code 3 to 28) ·When connecting via branch box: P15 to P100 model...
Page 106: Connecting Excessive Number Of Units
Check code Connecting excessive number of units 7102 Abnormal points and detection methods Causes and check points When the connected indoor unit exceeds 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 107: Address Setting Error
Check code Address setting error 7105 Abnormal points and detection methods Causes and check points The address setting of outdoor unit is wrong. Wrongly set address of indoor unit The outdoor unit is not set in 000, or in the range of 51 to 100.
Page 108: Remote Controller Diagnosis
8-2. REMOTE CONTROLLER DIAGNOSIS · For M-NET remote controller system If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below. First, check that the power-on indicator is lit. If the correct voltage (12 V DC) is not supplied to the remote controller, the indicator will not light.
Page 109 · For MA remote controller system Select "Service" from the Main menu, and press the button. Maintenance password Remote controller check Function setting Select "Remote controller check" with the F1 or F2 button, and press button. Select "Remote controller check" from the Service menu, and press Remote controller check button to start the remote controller check and see the check re- sults.
Page 110 8-3. REMOTE CONTROLLER TROUBLE 1Hr. CENTRALLY CONTROLLED ON OFF °C CLOCK CHECK FILTER CHECK MODE °C TEST RUN STAND BY “ ” Indicator: appears when current is carried. ERROR CODE NOT AVAILABLE FUNCTION DEFROST TEMP. ON/OFF FILTER CHECK TEST TIMER SET (M-NET Remote controller) (1) For M-NET remote controller systems Symptom or inspection code...
Page 111 8-4. THE FOLLOWING SYMPTOM DO NOT REPRESENT TROUBLE (EMERGENCY) Symptom Display of remote controller CAUSE Even the cooling (heating) "Cooling (Heating)" blinks The indoor unit can not cool (Heat) if other indoor units are heating operation selection button (Cooling). is pressed, the indoor unit cannot be operated.
Page 112 8-5. INTERNAL SWITCH FUNCTION TABLE PUMY-P112/125/140YKM1(-BS) PUMY-P112/125/140VKM1(-BS) ■ The black square ( ) indicates a switch position. Continue to the next page OCH576...
Page 113 ■ The black square ( ) indicates a switch position. OCH576...
Page 114 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 (PAC-SA88HA-E) G Max. 10m CN51 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 115 8-7. HOW TO CHECK THE PARTS PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) Parts name Check points Thermistor (TH2) Disconnect the connector then measure the resistance with a tester. <HIC pipe> (At the ambient temperature 10 to 30 :) Thermistor (TH3)
Page 116 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. board and fan motor.) (It causes trouble of the outdoor multi controller circuit Self check...
Page 117 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 ± 2 % =15exp{3480( – 273+t 15 k" 4.3 k" 9.6 k" 3.0 k"...
Page 118 8-9. TEST POINT DIAGRAM Outdoor multi controller circuit board PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) <CAUTION> TEST POINT 1 is high voltage. CN51 External signal Model selection Pump down Test run Forced defrost Model selection output CN102 Connect to the M-NET...
Page 119 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUMY-P112VKM1(-BS) Measure the resistance in the following points (connectors, etc.). PUMY-P125VKM1(-BS) If they are short-circuited, it means that they are broken.
Page 120 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUMY-P112YKM1(-BS) Measure the resistance in the following points (connectors, etc.). PUMY-P125YKM1(-BS) If they are short-circuited, it means that they are broken. 1.
Page 121 M-NET power circuit board PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) Connect to the outdoor multi PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) 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 noise filter circuit board (CNAC1) (Y) • Connect to the outdoor power circuit board (CNAC1) (V) 1–3 : 220–240 V AC OCH576...
Page 122 Outdoor noise filter circuit board PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) LI1, LI2, LI3, NI CNAC1 POWER SUPPLY LI1-LI2/LI2-LI3/LI3-LI1 : 380/400/415 V AC input 220/230/240 V AC LI1-NI/LI2-NI/LI3-NI : 220/230/240 V AC input (Connect to the M-NET power circuit board(CN1)) (Connect to the terminal block (TB1)) Connect to the elec- trical parts box Connect to the electrical parts box CNAC2...
Page 123 8-10. OUTDOOR UNIT INFORMATION DISPLAY SW:setting 0..OFF 1..ON OCH576...
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Page 131: Electrical Wiring
ELECTRICAL WIRING This chapter provides an introduction to electrical wiring for the CITY MULTI-S series, together with notes concerning power wiring, wiring 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 132 <When power is supplied separately> PUMY-P•VKM1 series ～ /N 220/230/240 V, 50 Hz ～ /N 220/230/240 V, 50 Hz ～ /N 220 V, 60 Hz ～ /N 220 V, 60 Hz S1/S2/S3 S1/S2/S3 PUMY-P•YKM1 series S1/S2/S3 S1/S2/S3 S1/S2/S3 S1/S2/S3 Grounded 3N～380/400/415 V, 50Hz L1/L2/L3/N A Switch (Breakers for Wiring and Current Leakage)
Page 133 Cross section area of Wire for Main Power and ON/OFF capacities 9-2-2. PUMY-P112VKM1(-BS) PUMY-P112YKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140VKM1(-BS) PUMY-P140YKM1(-BS) Cross-sectional area of Wire for Main Power Supply and On/Off Capacities Minimum Wire Cross-sectional area (mm²) Power Supply Breaker for Wiring *1...
Page 134: Wiring Transmission Cables
9-3. DESIGN FOR CONTROL WIRING Please note that the types and numbers of control wires needed by the CITY 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 135 9-5. SYSTEM SWITCH SETTING In order to identify the destinations of signals to the outdoor units, indoor units, and remote controller of the 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 136 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 the 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 137: Refrigerant Piping Tasks
REFRIGERANT PIPING TASKS 10-1. REFRIGERANT PIPING SYSTEM 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 [ 300 m Permissible Farthest Piping Length A+B+C+d [ 150 m Length Farthest Piping Length After First Branch B+C+d [ 30 m Permissible High/ High/Low Difference in Indoor/Outdoor Section...
Page 138 Header-Branch Method Connection Examples (Connecting to 4 Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+a+b+c+d [ 300 m Permissible Farthest Piping Length A+d [ 150 m Length Farthest Piping Length After First Branch d is 30 meters or less Permissible High/ High/Low Difference in Indoor/Outdoor Section 50 meters or less (If the outdoor unit is lower, 40 meters or less)
Page 139 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 300 meters or less Permissible Farthest Piping Length...
Page 140 10-2. REFRIGERANT PIPING SYSTEM (WHEN USING BRANCH BOX) AOutdoor unit BBranching joint CBranch box Branch box Method DIndoor unit Connection Examples (Connecting to 8 Indoor Units) Total piping length A + B + C + a + b + c + d + e + f + g + h ≦ 150 m Farthest piping length (L) A + C + h ≦...
Page 141 A Outdoor Unit B First joint C Branch header (CMY) D Branch box (PAC-MK30/50) E CityMulti Indoor unit F M/S/P series Indoor unit Mixed Method Connection Examples (Connecting to 1 Branch box) Total piping length A+B+C+D+E+a+b+c+d+e+f+g+h+i+j ≦300 m Farthest piping length (L1) A+E+a or A+B+C+e ≦...
Page 142 A Outdoor Unit B First joint C Branch header (CMY) D Branch box (PAC-MK30/50) E CityMulti Indoor unit F M/S/P series Indoor unit Mixed Method Connection Examples (Connecting to 2 Branch boxes) Total piping length A+B+C+D+E+a+b+c+d+e+f+g+h+i+j+k ≦240m Farthest piping length (L1) A+E+a ≦...
Page 143: Precautions Against Refrigerant Leakage
10-3. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 10-3-1. 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 144: Disassembly Procedure
DISASSEMBLY PROCEDURE PUMY-P112VKM1(-BS) PUMY-P125VKM1(-BS) PUMY-P140VKM1(-BS) Note: Turn OFF the power supply before disassembly. PHOTOS & ILLUSTRATION OPERATING PROCEDURE Top panel 1. Removing the service panel and top panel Top panel fixing screws Photo 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide...
Page 145 From the previous page. OPERATING PROCEDURE PHOTOS & ILLUSTRATION Electrical parts box (6) Remove 2 electrical parts box fixing screws (4 × 10) and Photo 5 detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
Page 146 PHOTOS OPERATING PROCEDURE 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and Photo 9 thermistor <Compressor> (TH4), thermistor <HIC pipe> (TH2) (1) Remove the service panel. (See Photo 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 147 OPERATING PROCEDURE PHOTOS 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) Electronic expansion valve coil (LEV-B) (2) Remove the top panel. (See Photo 1) Bypass valve (3) Remove 3 right side panel fixing screws (5 × 12) in the rear coil fixing screw Bypass valve coil (SV1)
Page 148 OPERATING PROCEDURE PHOTOS Photo 13 13. Removing the compressor (MC) Valve bed (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Valve bed (3) Remove 2 front cover panel fixing screws (5 × 12) and fixing screw remove the front cover panel.
Page 149 PUMY-P112YKM1(-BS) PUMY-P125YKM1(-BS) PUMY-P140YKM1(-BS) Note: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS & ILLUSTRATION Top panel Photo 1 Top panel fixing screws 1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide Service panel the hook on the right downward to remove the service fixing screw...
Page 150 From the previous page. OPERATING PROCEDURE PHOTOS & ILLUSTRATION (6) Remove 2 electrical parts box fixing screws (4 × 10) Photo 5 and detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left Electrical parts box and 1 hook on the right.
Page 151 PHOTOS OPERATING PROCEDURE Photo 9 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and thermistor <Compressor> (TH4), thermistor <HIC pipe> (TH2) (1) Remove the service panel. (See Photo 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 152 OPERATING PROCEDURE PHOTOS 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) Electronic expansion Bypass valve (2) Remove the top panel. (See Photo 1) valve coil (LEV-B) coil fixing screw Bypass valve (3) Remove 3 right side panel fixing screws (5 ×...
Page 153 OPERATING PROCEDURE PHOTOS 13. Removing the reactor (DCL) Photo 13 (1) Remove the service panel. (See Photo 1) 4-way valve (2) Disconnect the lead wires from the reactor. Reactor box (3) Remove the 4 screws, that fix the reactor box. (See Photo 13) (4) Remove the reactor box.
Page 154 OPERATING PROCEDURE PHOTOS Photo 14 14. Removing the compressor (MC) Valve bed (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Valve bed (3) Remove 2 front cover panel fixing screws (5 × 12) and fixing screw remove the front cover panel.
Page 155 OCH576...
Page 156 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct. 2014 No.OCH576 New publication, effective Oct. 2014 Made in Japan Specifications are subject to change without notice.

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Mitsubishi Electric PUMY-P112VKM1 Service Manual

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