Page 1: Table Of Contents
utilized R410A SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS June 2020 No. OCH740 TECHNICAL & SERVICE MANUAL <Outdoor unit> [Model Name] [Service Ref.] PUMY-P112VKM5 PUMY-P112VKM5 PUMY-P125VKM5 PUMY-P125VKM5 PUMY-P140VKM5 PUMY-P140VKM5 PUMY-P112VKM5-ET PUMY-P112VKM5-ET PUMY-P125VKM5-ET PUMY-P125VKM5-ET PUMY-P140VKM5-ET PUMY-P140VKM5-ET PUMY-P112VKM5-ER PUMY-P112VKM5-ER PUMY-P125VKM5-ER PUMY-P125VKM5-ER PUMY-P140VKM5-ER PUMY-P140VKM5-ER Salt proof model PUMY-P112VKM5-BS PUMY-P112VKM5-BS PUMY-P125VKM5-BS...
Page 2: Safety Precaution
SAFETY PRECAUTION 1-1. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Precautions during the repair service Preparation before the repair service • Do not perform the work involving the electric parts • Prepare the proper tools. with wet hands. •...
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. SYSTEM CONSTRUCTION Outdoor unit P112 P125 P140 Capacity Type 10 to Type 140 Applicable Number of units 1 to 9 unit 1 to 10 unit 1 to 12 unit indoor unit *1 *2 Total system capacity range 50 to 130% of outdoor unit capacity CMY-Y62-G-E CMY-Y64-G-E...
Page 6 2-2. SYSTEM CONSTRUCTION (BRANCH BOX SYSTEM) P112 P125 P140 Outdoor unit Capacity Type 15 to Type 100 Number of units 2 to 8 units Applicable indoor unit Total system capacity 24 to 130 % of outdoor unit capacity 21 to 130 % of outdoor unit capacity 19 to 130 % of outdoor unit capacity range (3.0 to 16.2 kW)
Page 7 2-3. SYSTEM CONSTRUCTION (MIXED SYSTEM) Outdoor unit P112 P125 P140 CITY MULTI indoor unit *4*5 Type 15 to Type 140 Capacity Via branch box Type 15 to Type 100 Applicable Via branch box CITY MULTI indoor Via branch box CITY MULTI indoor Via branch box CITY MULTI indoor indoor unit Number 1-branch box...
Page 8 2-4. SYSTEM SPECIFICATIONS (1) Outdoor Unit Model P112 P125 P140 Cooling (kW) 12.5 14.0 15.5 Capacity Heating (kW) 14.0 16.0 18.0 Cooling/Heating capacity indicates the maximum value at operation under the following condition. Cooling Indoor: D.B. 27°C/W.B. 19.0°C Outdoor: D.B. 35°C Heating Indoor: D.B.
Page 9 ■ When connecting Cylinder unit or Hydrobox ATW Heating + ATA Cooling DHW only ATW Heating only DHW + ATA Heating Heating Outlet water temperature ─ 55°C Max. 55 °C Max. 55 °C Max. 45 to 55 °C Max. Outdoor temperature ─...
Page 10: Specifications
DC control Motor output 0.074+0.074 External static press. Compressor Type × Quantity Scroll hermetic compressor x 1 Manufacture Mitsubishi Electric Corporation Starting method Inverter Capacity Cooling 26 to 100 Cooling 24 to 100 Cooling 21 to 100 control Heating 20 to 100...
Page 11: Data
DATA 4-1. SELECTION OF COOLING/HEATING UNITS <Cooling> Design Condition Outdoor Design Dry Bulb Temperature 45ºC Total Cooling Load 10.6 kW Room1 27ºC Indoor Design Dry Bulb Temperature 20ºC Indoor Design Wet Bulb Temperature Cooling Load 4.6 kW Room2 Indoor Design Dry Bulb Temperature 24ºC Indoor Design Wet Bulb Temperature 18ºC...
Page 12 <Heating> Design Condition Outdoor Design Wet Bulb Temperature 2ºC Total Heating Load 13.2 kW Room1 Indoor Design Dry Bulb Temperature 23ºC Heating Load 5.4 kW Room2 Indoor Design Dry Bulb Temperature 23ºC 7.8 kW Heating Load <Other> Indoor/Outdoor Equivalent Piping Length 60 m Capacity of indoor unit Unit: kW...
Page 13 4-2. CORRECTION BY TEMPERATURE The outdoor units 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 Indoor Temperature [°CW.B.] Figure 8 Outdoor unit temperature correction To be used to correct outdoor unit capacity only...
Page 14 <Heating> Figure 9 Indoor unit temperature correction To be used to correct indoor unit capacity only Indoor Temperature [°CD.B.] Figure 10 Outdoor unit temperature correction To be used to correct outdoor unit capacity only 20°C D.B -5.0 10.0 15.0 -20.0 -15.0 -10.0 Outdoor Temperature [°C W.B.]...
Page 15 4-3. STANDARD OPERATION DATA (REFERENCE DATA) PUMY-P112VKM5(-BS) PUMY-P125VKM5(-BS) PUMY-P140VKM5(-BS) Operation PUMY-P112VKM5-ET(BS) PUMY-P125VKM5-ET(BS) PUMY-P140VKM5-ET(BS) PUMY-P112VKM5-ER(BS) PUMY-P125VKM5-ER(BS) PUMY-P140VKM5-ER(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. of units in operation Model —...
Page 16 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. SELECTION OF COOLING/HEATING UNITS˝. 4-4-1. PUMY-P112VKM5(-BS) PUMY-P112VKM5-ET(BS) PUMY-P112VKM5-ER(BS) <Cooling> 16.0 14.0 12.0 10.0 10.0 12.0...
Page 17 PUMY-P112VKM 4-4-2. PUMY-P112VKM5(-BS) PUMY-P112VKM5-ET(BS) PUMY-P112VKM5-ER(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 15.0 220V 230V 240V 10.0 10.0 12.0 14.0 16.0 18.0...
Page 18 4-4-3. PUMY-P125VKM5(-BS) PUMY-P125VKM5-ET(BS) PUMY-P125VKM5-ER(BS) <Cooling> 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 15.0 220V 230V 240V 10.0 10.0 12.0 14.0 16.0 18.0...
Page 19 4-4-4. PUMY-P125VKM5(-BS) PUMY-P125VKM5-ET(BS) PUMY-P125VKM5-ER(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 15.0 220V 230V 240V 10.0 10.0 12.0 14.0 16.0 18.0...
Page 20 4-4-5. PUMY-P140VKM5(-BS) PUMY-P140VKM5-ET(BS) PUMY-P140VKM5-ER(BS) <Cooling> 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 20.0 220V 230V 15.0 240V 10.0 10.0...
Page 21 4-4-6. PUMY-P140VKM5(-BS) PUMY-P140VKM5-ET(BS) PUMY-P140VKM5-ER(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 20.0 220V 230V 15.0 240V 10.0 10.0...
Page 22 4-5. CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING · 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 11 to 13. Then multiply by the cooling capacity from Figure 7 and 8 in ˝4-2.
Page 23 Figure 13 PUMY-P140VKM5(-BS) PUMY-P140VKM5-ET(BS) PUMY-P140VKM5-ER(BS) <Cooling> Total capacity of indoor unit 1.00 0.95 0.90 0.85 0.80 0.75 11.6 0.70 15.5 0.65 20.2 0.60 0.55 0.50 Piping equivalent length (m) Figure 14 PUMY-P112VKM5(-BS) PUMY-P112VKM5-ET(BS) PUMY-P112VKM5-ER(BS) <Heating> PUMY-P125VKM5(-BS) PUMY-P125VKM5-ET(BS) PUMY-P125VKM5-ER(BS) PUMY-P140VKM5(-BS) PUMY-P140VKM5-ET(BS) PUMY-P140VKM5-ER(BS) 1.00 0.95...
Page 24 4-6. NOISE CRITERION CURVES PUMY-P112VKM5(-BS) PUMY-P125VKM5(-BS) SPL(dB) SPL(dB) MODE LINE MODE LINE PUMY-P112VKM5-ET(BS) PUMY-P125VKM5-ET(BS) COOLING COOLING PUMY-P112VKM5-ER(BS) HEATING HEATING PUMY-P125VKM5-ER(BS) 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 CONTINUOUS CONTINUOUS...
Page 25: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm OCH740...
Page 26: Wiring Diagram
WIRING DIAGRAM OCH740...
Page 27: Necessary Conditions For System Construction
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH740...
Page 28 7-2. Special Function Operation and Settings for M-NET Remote Controller (M-NET remote controller cannot be connected with a refrigerant system which includes branch box.) It is necessary to perform “group settings” and “Interlocked LOSSNAY” at making group settings of different refrigerant systems (multiple outdoor unit).
Page 29 (a) Group setting Use this screen to register the indoor units and the AHC to be controlled from the controller. 1. Select an indoor unit or an AHC address in the [Address] field. [Group setting] The number of units that can be registered. Indoor unit: 16 units maximum Address AHC: 1 unit maximum...
Page 30 7-3. REFRIGERANT SYSTEM DIAGRAM Thermistor (TH7) Check valve <Ambient> <High pressure> Service port 4-way valve Strainer Refrigerant Gas pipe High pressure Ball valve sensor (63H) Solenoid Oil separator valve (SV1) Check valve Distributor <Low pressure> High pressure Strainer switch Thermistor (TH6) Capillary Thermistor (TH3) Strainer...
Page 31 7-4. REFRIGERANT SYSTEM DIAGRAM (WHEN USING BRANCH BOX) Condenser/evaporator temperature thermistor Room temperature thermistor (TH1 or RT11) (TH5 or RT12) Check valve Thermistor (TH7) <High pressure> <Ambient> Service port 4-way valve Strainer High pressure Ball valve sensor (63HS) Oil separator Solenoid Check valve valve (SV1)
Page 32 ■ Pipe size (Branch box-Indoor unit) For M or S series Indoor unit Indoor unit type (kW) Pipe size (mm) ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø9.52 Liquid ø9.52 ø9.52 ø9.52 ø9.52 ø9.52 ø9.52 ø9.52 ø12.7 ø15.88 ø15.88 ■...
Page 33 7-5. SYSTEM CONTROL 7-5-1. Example for the System • Example for wiring control cables, wiring method and address setting, permissible lengths, and the constraint 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 1.
Page 34 • Name, Symbol and the Maximum Remote controller Units for Connection Name Symbol Maximum units for connection Outdoor unit — CITY MULTI M-IC Refer to ˝2-1. SYSTEM CONSTRUCTION˝. series 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 35 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 36 • Name, Symbol, and the Maximum Units for Connection • Longest length via outdoor units: [ 500 meters (1.25 mm²) • Longest transmission cable length: L [ 200 m (1.25 mm²) • M-NET Remote controller cable length: R1, R2+R3 [ 10 m (0.5 to 1.25 mm²) If the length exceeds 10 m, use a 1.25 mm²...
Page 37 C. Example of an 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 CITY MULTI series indoor unit. Example of wiring control cables Wiring Method and Address Setting 1.
Page 38 Permissible Lengths Constraint items Longest transmission cable length: The MA remote L1 + L2 [ 200 m (1.25 mm²) controller and the (00) MA remote controller cable length: M-IC M-IC M-NET remote con- R1, R2 [ 200 m (0.3 to 1.25 mm²) troller cannot be (00) (00)
Page 39 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 40 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L and L [ 500 m (1.25 mm² or more) Longest transmission cable length (M-NET cable): L and L [ 200 m (1.25 mm² or more) MA Remote controller cable length: m1, m1+m2+m3 and m1+m2+m3+m4 [ 200 m (0.3 to 1.25 mm²) (51) M-IC...
Page 41 E. Example of a system using Branch Box and A-Control indoor unit TB3A TB5/TB15 Branch Box A-IC MA-RC (01) (51) TB3B TB5/TB15 M1 M2 S M1 M2 S A-IC MA-RC (02) TB3C TB5/TB15 A-IC MA-RC (03) (01) TB3D A-IC WL-RC (04) TB3E A-IC...
Page 42 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L [ 500 m (1.25 mm² or more) Longest transmission cable length (M-NET cable): L [ 200 m (1.25 mm² or more) Longest transmission cable length (A-Control cable): L [ 25 m (1.5 mm²) Remote controller cable length: m1 [ 200 m (0.3 to 1.25 mm²) TB3A...
Page 43 F. Example of a system using Branch Box, A-Control indoor unit, and CITY MULTI series indoor unit. TB3A TB5/TB15 Branch Box A-IC MA-RC (01) (51) TB3B TB5/TB15 M1 M2 S M1 M2 S A-IC MA-RC (02) TB3C TB5/TB15 A-IC MA-RC (03) TB3D A-IC...
Page 44 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L [ 500 m (1.25 mm² or more) Longest transmission cable length (M-NET cable): L and L7 [ 200 m (1.25 mm² or more) Longest transmission cable length (A-Control cable): L8 [ 25 m (1.5 mm²) Remote controller cable length: m1 [ 200 m (0.3 to 1.25 mm²) TB3A...
Page 45: 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 46 8-1-1-2. Test run for MA remote controller <PAR-4xMAA (˝x˝ represents 0 or later)> MENU RETURN SELECT ON/OFF Function buttons Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Select ˝Test run˝ with the F1 or F2 button, and press the [ ] button.
Page 47 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 48 Check code Serial communication error 0403 (Ed) Abnormal points and detection methods Causes and checkpoints If serial communication between the outdoor multi controller circuit board Wire breakage or contact failure of connector CN2 or 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 49 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 110 [230°F] continuously for 5 minutes shortage of refrigerant ●exceeds 125 [257°F] Defective thermistor...
Page 50 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 51 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. (* 4.15 MPaG [602 Clogged or broken pipe PSIG]) Malfunction or locked outdoor fan motor...
Page 52 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 53 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 54 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. Disconnect the thermistor wiring to check the resistance.
Page 55 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 −15 [−27°F](*) or less for Disconnection or loose connection of TH4 5 minutes even though the indoor LEV has minimum open pulse after the Defective holder of TH4 compressor starts operating for 10 minutes.
Page 56 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 57 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 58 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 59 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. Malfunction of outdoor LEV (LEV1)(blockage) When both of the following temperature conditions have been satisfied for 20 minutes or more during cooling operation.
Page 60 Check code Anti-freeze protection of plate heat exchanger 1503 Freeze protection of branch box or indoor unit (P6) Abnormal points and detection methods Causes and checkpoints The purpose of the check code is to prevent indoor unit from freezing or Wrong piping connection between indoor unit and dew condensation which is caused when a refrigerant keeps flowing into branch box...
Page 61 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 Disconnection or loose connection of connectors...
Page 62 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 since the compressor starts operating. Decrease of power supply voltage Looseness, disconnection, or wrong phase of compressor wiring connection...
Page 63 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 64 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 65 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. Continued from the previous page. Connect the compressor wiring (U, V and W phase) properly, then turn the power Are they connected properly?
Page 66 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 L1 open-phase (Y model only) ●Decrease of DC bus voltage to 200 V(\/model), 350 V (Y model) Primary current sensor failure...
Page 67 Check code Voltage shortage/overvoltage/PAM error/L1 open phase/primary 4220 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 any connectors, or replacing boards. The black square (■) indicates a switch position. Diagnosis Remedy Continued from the previous page.
Page 68 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 Thermistor <Heat sink> TH8: Rise of ambient temperature Characteristic defect of thermistor...
Page 69 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 70 Check code Fan trouble (Outdoor unit) 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 multi controller circuit board ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Page 71 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 multi controller circuit board...
Page 72 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 multi controller circuit board...
Page 73 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 multi controller circuit board...
Page 74 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°C [−40°F] or less Characteristic defect of thermistor Short: 90°C [162°F] or more TH7: Thermistor <Ambient>...
Page 75 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°C [−40°F] or less Characteristic defect of thermistor Short: 90°C [162°F] or more TH2: Thermistor <HIC pipe>...
Page 76 Check code Heat sink temperature thermistor(TH8) open/short 5110 (U4) Abnormal points and detection methods Causes and checkpoints If TH8 (Internal thermistor) detects to be open/short. Disconnection or contact failure of connectors P112/125/140V model <Internal thermistor> Characteristic defect of thermistor Open: −35.1°C [−31.2°F] or less Defective outdoor multi controller circuit board Short: 170.3°C [338.5°F] or more 2P112/125/140Y model...
Page 77 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 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 78 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 −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>.
Page 79 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 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 80 Check code Duplex address error 6600 (A0) Abnormal points and detection methods Causes and checkpoints If 2 or more units with the same address exist. 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 81 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 82 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 due data collision continues for 8 to 10 minutes. to a short-cycle voltage such as noise is mixed on An abnormality when data cannot be output on the transmission line the transmission line.
Page 83 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 lighting surge If the address transmission from the unit processor was not normally Hardware malfunction of transmission processor transmitted.
Page 84 Check code No ACK error 6607 (A7) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints 1. Represents a common error detection 1. 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 85 Check code No ACK error 6607 (A7) Chart 2 of 4 Abnormal points and detection methods Causes and checkpoints 5. The cause of displayed address and attribute is on the Fresh Master 1. 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...
Page 86 Check code No ACK error 6607 (A7) Chart 3 of 4 Note: ●Diagnosis of defects When the address of the outdoor unit is displayed as abnormal, the Make sure to turn the power OFF before connecting/disconnecting outdoor circuit board may be faulty. If the unit is not restored after any connectors, or replacing boards.
Page 87 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 88 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 89 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 90 Check code MA communication receive error 6831, 6834 (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 91 Check code MA communication send error 6832 6833 (EF) 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 92 Check code MA communication send error 6832 6833 (EF) 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 93 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 capacity (130% of the outdoor unit capacity), a check code <7100> is exceeds the specified capacity.
Page 94 Check code Capacity code error 7101 (EF) Abnormal points and detection methods Causes and checkpoints 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: ·...
Page 95 Check code Connecting excessive number of units 7102 and branch boxes (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor unit exceeds the limit, a check code <7102> is Connecting more indoor units and branch boxes than displayed.
Page 96 Check code Address setting error 7105 (EF) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints The address setting of connected unit is wrong. There is a unit without correct address setting in the range specified in ˝7-5. SYSTEM CONTROL˝. ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Page 97 Check code Address setting error 7105 (EF) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy <M-NET RC (main)> Check whether the M-NET RC (main) address is set in 000, or in the range of 101 to 150.
Page 98 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 99 8-2. REMOTE CONTROLLER DIAGNOSIS · For MA remote controller system If operations cannot be completed with the remote controller, diagnose the remote controller with this function. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Remote controller check Select ˝Check˝...
Page 100 8-3. REMOTE CONTROLLER TROUBLE (1) For M-NET remote controller systems Symptom or inspection code Cause Inspection method and solution Though the content of operation is • The power supply of the indoor unit is not on. • Check the part where the displayed on the remote •...
Page 101 8-4. THE FOLLOWING SYMPTOMS DO NOT REPRESENT TROUBLE (EMERGENCY) Symptom Display of remote controller CAUSE Even the cooling (heating) ˝Cooling (Heating)˝ blinks The indoor unit cannot cool (Heat) if other indoor units are operation selection button heating (Cooling). is pressed, the indoor unit cannot be operated.
Page 102 8-5. INTERNAL SWITCH FUNCTION TABLE ■ The black square ( ) indicates a switch position. OCH740...
Page 103 ■ The black square ( ) indicates a switch position. OCH740...
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 G Max. 10m CN51 adapter (PAC-SA88HA-E) D Outdoor unit control board : Error display lamp : Compressor operation lamp X, Y: Relay (coil rating: ≤...
Page 105 8-7. HOW TO CHECK THE PARTS Parts name Checkpoints Thermistor (TH2) Disconnect the connector then measure the resistance with a multimeter. <HIC pipe> (At the ambient temperature 10 to 30°C) Thermistor (TH3) Normal Abnormal <Outdoor liquid pipe> 160 to 410 kΩ Thermistor (TH4) <Compressor>...
Page 106 Check method of DC fan motor (fan motor/outdoor multi controller circuit board) 1 Notes · High voltage is applied to the connector (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.) 2 Self check Symptom: The outdoor fan cannot rotate.
Page 107 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 kΩ ± 3 % B constant = 3480 ±...
Page 108 <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 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 109 <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 110 8-9. TEST POINT DIAGRAM Outdoor multi controller circuit board <CAUTION> TEST POINT 1 is high voltage. CN51 External signal Pump down Test run Manual defrost Model selection Model selection output CN102 Connect to the M-NET power circuit board Function selection CN40,CN41 Centralized control power Function selection...
Page 111 Brief Check of POWER MODULE Outdoor power circuit board If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check of POWER MODULE 1 Check of DIODE circuit R - P1 S - P1 R - N1 S - N1 2 Check of IGBT circuit P2 - L1 P2 - L2 N2 - L1 N2 - L2 3 Check of INVERTER circuit...
Page 112 M-NET power circuit board Connect to the outdoor multi controller circuit board (CN102) 1–2: 24–30 VDC 3–4: 24–30 VDC 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 VAC OCH740...
Page 113 8-10. OUTDOOR UNIT INFORMATION DISPLAY SW:setting 0..OFF 1..ON OCH740...
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Page 121: Electrical Wiring
ELECTRICAL WIRING This chapter provides an introduction to electrical wiring for CITY MULTI 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 (1) Use a separate power supply for the outdoor unit and indoor unit. (2) Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
Page 122 <When power is supplied separately> PUMY-P•VKM5 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 S1/S2/S3 S1/S2/S3 S1/S2/S3 S1/S2/S3 A Switch (Breakers for Wiring and Current Leakage) B Outdoor Unit C Branch Box D A-Control Indoor Unit...
Page 123 9-2-2. Cross section area of Wire for Main Power and ON/OFF capacities <Outdoor unit> <When power is supplied to outdoor unit and branch box separately> Minimum Wire Cross-sectional area (mm²) Power Supply Breaker for Wiring * Breaker for Current Leakage Model Main Cable Branch...
Page 124 9-3. DESIGN FOR CONTROL WIRING Please note that the types and numbers of control wires needed by CITY MULTI 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 125 9-5. SYSTEM SWITCH SETTING In order to identify the destinations of signals to the outdoor units, indoor units, and remote controller of CITY MULTI 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 126 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 CITY MULTI 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 127: Refrigerant Piping Tasks
REFRIGERANT PIPING TASKS 10-1. REFRIGERANT PIPING SYSTEM 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 [ 300 m Permissible Farthest Piping Length A+B+C+d [ 150 m Length Farthest Piping Length B+C+d [ 30 m After First Branch The outdoor unit is upper: 50 meters or less...
Page 128 Outdoor Unit First Branch Indoor unit Header-Branch Method Connection Examples (Connecting to 4 Indoor Units) Total Piping Length A+a+b+c+d [ 300 m Permissible Farthest Piping Length A+d [ 150 m Length Farthest Piping Length d is 30 meters or less After First Branch The outdoor unit is upper: 50 meters or less High/Low Difference in...
Page 129 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 130 10-2. REFRIGERANT PIPING SYSTEM (WHEN USING BRANCH BOX) AOutdoor unit BBranching joint CBranch box DIndoor unit Branch box Method 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 [ 80 m Permissible...
Page 131 A Outdoor Unit B First joint C Branch header D Branch box E CITY MULTI 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 [ 85 m Farthest piping length.
Page 132 A Outdoor Unit B First joint C Branch header D Branch box E CITY MULTI 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 [ 240 m Farthest piping length (L1) A+E+a [ 85 m Farthest piping length.
Page 133 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 134: Disassembly Procedure
DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. Note: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel panel.
Page 135 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES (6) Remove 2 electrical parts box fixing screws (4 × 10) and Photo 5 Electrical parts box 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 136 OPERATING PROCEDURE PHOTOS/FIGURES 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 137 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) Linear expansion valve Linear coil (LEV-B) (2) Remove the top panel. (See Photo 1) expansion valve (3) Remove the cover panel (front). (Refer to procedure 8 (5)) (4) Remove the cover panel (rear).
Page 138 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 13 (1) Remove the service panel. (See Photo 1) Valve bed (2) Remove the top panel. (See Photo 1) fixing screw Valve (3) Remove 2 front cover panel fixing screws (5 × 12) and bed fixing remove the front cover panel.
Page 139 OPERATING PROCEDURE PHOTOS/FIGURES 15. Removing the reactor (DCL) Figure 3 (1) Remove the service panel. (See Photo 1) Reactors (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box (See Photo 5) (4) Remove 6 screws (4 x 10) for reactor to remove the reactors.
Page 140 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Published: Jun. 2020 No.OCH740 Specifications are subject to change without notice. Made in Japan...

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Mitsubishi Electric CITY MULTI PUMY-P112VKM5 Technical & Service Manual

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