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Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model Name]
PUMY-P300YBM
PUMY-P250YBM-ER
PUMY-P300YBM-ER
PUMY-P250YBM-ET
PUMY-P300YBM-ET
Salt proof model
PUMY-P250YBM-BS
PUMY-P300YBM-BS
PUMY-P250YBM-ERBS
PUMY-P300YBM-ERBS
PUMY-P250YBM-ETBS
PUMY-P300YBM-ETBS
Service Ref.
PUMY-P250YBM.TH
PUMY-P300YBM.TH
PUMY-P250YBM-ER.TH
PUMY-P300YBM-ER.TH
PUMY-P250YBM-ET.TH
PUMY-P300YBM-ET.TH
PUMY-P250YBM-BS.TH
PUMY-P300YBM-BS.TH
PUMY-P250YBM-ERBS.TH
PUMY-P300YBM-ERBS.TH
PUMY-P250YBM-ETBS.TH
PUMY-P300YBM-ETBS.TH
CONTENTS
1. SAFETY PRECAUTION .................................... 2
2. OVERVIEW OF UNITS ...................................... 6
3. SPECIFICATIONS ........................................... 10
4. DATA ................................................................ 11
5. OUTLINES AND DIMENSIONS ...................... 22
6. WIRING DIAGRAM ......................................... 23
8. TROUBLESHOOTING .................................... 40
9. ELECTRICAL WIRING ................................... 111
10. REFRIGERANT PIPING TASKS .................... 117
11. DISASSEMBLY PROCEDURE ....................... 125
12. REMOTE CONTROLLER ............................... 130
PARTS CATALOG (OCB760)
HFC
utilized
R410A
May 2021
No. OCH760
Note:
• This service manual
describes technical data
of the outdoor units only.
As for indoor units, refer
to its service manual.
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Summary of Contents for Mitsubishi Electric PUMY-P250YBM

  • Page 1 R410A SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS May 2021 No. OCH760 TECHNICAL & SERVICE MANUAL [Model Name] Service Ref. PUMY-P250YBM.TH Note: PUMY-P250YBM • This service manual PUMY-P300YBM.TH PUMY-P300YBM describes technical data PUMY-P250YBM-ER.TH of the outdoor units only. PUMY-P250YBM-ER As for indoor units, refer PUMY-P300YBM-ER.TH...
  • Page 2 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 1-3. 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 3 Tools for R410A (The following table shows whether conventional tools can be used or not.) Tools and materials R410A tools Can R22 tools be used? Can R407C tools be used? Gauge manifold Tool exclusive for R410A Air purge, refrigerant charge and operation check Charge hose Tool exclusive for R410A...
  • Page 6 OVERVIEW OF UNITS 2-1. SYSTEM CONSTRUCTION 10HP 12HP Outdoor unit P250YBM P300YBM Applicable Capacity Type 10 to Type 250 indoor unit Number of units 1 to 30 units Total system capacity range 50 to 130 % of outdoor unit capacity 50 to 130 % of outdoor unit capacity (14.0 to 36.4 kW) (16.8 to 43.5 kW)
  • Page 7 2-2. SYSTEM CONSTRUCTION (BRANCH BOX SYSTEM) 10HP 12HP Outdoor unit P250YBM P300YBM Capacity kW unit: Type 15 to Type 50 Number of units 2 to 12 units Applicable indoor unit Total system capacity range 50 to 130% of outdoor unit capacity 50 to 130% of outdoor unit capacity (16.8 to 43.5 kW) (14.0 to 36.4 kW)
  • Page 8 2-3. SYSTEM CONSTRUCTION (MIXED SYSTEM) 10HP 12HP Outdoor unit P250YBM P300YBM Capacity CITY MULTI indoor unit *3 Type 10 to Type 250 Via branch box kW unit: Type 15 to Type 50 Number of units CITY MULTI CITY MULTI Total Via branch box Total Via branch box...
  • Page 9 2-4. SYSTEM SPECIFICATIONS (1) Outdoor Unit Outdoor unit P250YBM P300YBM SSSSOutffg Capacity Cooling (kW) 28.0 33.5 Heating (kW) 31.5 37.5 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 10 SPECIFICATIONS 3-1. OUTDOOR UNIT Model PUMY-P250YBM (-BS) PUMY-P300YBM (-BS) Power source 3-phase, 380-400-415V, 50Hz Cooling capacity 28.0 33.5 (Nominal) kcal/h 24,100 28,800 Btu/h 95,500 114,300 Power input 8.21 10.12 Current input 13.35 - 12.68 - 12.22 16.36 - 15.54 - 14.98 kW/kW 3.41...
  • Page 11 (3) Selection of Outdoor Unit Figure 1 Indoor unit temperature correction The P250 outdoor unit is selected as total indoor units capacity is P242 To be used to correct indoor unit only PUMY-P250YBM 28.0 kW Indoor temperature (4) Total Indoor Units Capacity Correction Calculation Room1, Room2 19°C W.B...
  • Page 12 Design Condition Outdoor Design Wet Bulb Temperature 2ºC Total Heating Load 25.0 kW Room1, Room2 Indoor Design Dry Bulb Temperature 24ºC 6.0 kW Heating Load Room3, Room4 Indoor Design Dry Bulb Temperature 25ºC 6.5 kW Heating Load Indoor/Outdoor Equivalent Piping Length 30 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. Figure 7 Indoor unit temperature correction To be used to correct indoor unit capacity only Indoor Temperature [°C W.B.] Figure 8 Outdoor unit temperature correction To be used to correct outdoor unit capacity only...
  • Page 14 Figure 9 Indoor unit temperature correction To be used to correct indoor unit capacity only Indoor Temperature [°C D.B.] Figure 10 Outdoor unit temperature correction To be used to correct outdoor unit capacity only Indoor Temperature 20°C D.B. Outdoor Temperature [°C W.B.] Indoor Temperature 20°C D.B 15°C D.B...
  • Page 15 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. SELECTION OF COOLING/HEATING UNITS". 4-3-1. PUMY-P250YBM 35.0 30.0 25.0 20.0 15.0 10.0...
  • Page 16 4-3-2. PUMY-P300YBM 40.0 35.0 30.0 25.0 20.0 15.0 10.0 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 41.5 43.5 45.5 Total capacity of indoor units(kW) 12.0 10.0 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 41.5 43.5 45.5 Total capacity of indoor units(kW) 20.0...
  • Page 17 4-3-3. PUMY-P250YBM 35.0 30.0 25.0 20.0 15.0 10.0 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 Total capacity of indoor units(kW) 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 Total capacity of indoor units(kW) 14.0...
  • Page 18 4-3-4. PUMY-P300YBM 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 41.5 43.5 45.5 Total capacity of indoor units(kW) 10.0 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 29.5 31.5 33.5 35.5 37.5 39.5 41.5 43.5 45.5 Total capacity of indoor units(kW) 18.0...
  • Page 19 • During heating, find the equivalent piping length, and find the capacity ratio corresponding to standard piping length from Figure 12. Then multiply by the heating capacity from Figure 9 and 10 in "4-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity. (1) Capacity Correction Curve Figure 11 PUMY-P250YBM Total capacity of indoor unit 1.00 14.0...
  • Page 20 Figure 13 PUMY-P300YBM Total capacity of indoor unit 1.00 16.75 0.95 25.13 0.90 0.85 0.80 33.5 43.5 0.75 0.70 0.65 Piping equivalent length (m) Figure 14 PUMY-P300YBM 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 Piping equivalent length (m) (2) Method for Obtaining the Equivalent Piping Length Equivalent length = (length of piping to farthest indoor unit) + (0.3 o number of bends in the piping) (m) 4-4-1.
  • Page 21 4-5. NOISE CRITERION CURVES PUMY-P250YBM PUMY-P300YBM MODE SPL(dB) LINE MODE SPL(dB) LINE COOLING COOLING HEATING 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 HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS...
  • Page 22 OUTLINES AND DIMENSIONS 5-1. OUTDOOR UNIT Unit: mm OCH760...
  • Page 23 (WH) (RD) (BU) DCL2 *1 MODEL SELECT The black square ( ) indicates a switch position. MODELS PUMY-P250YBM 1 2 3 4 5 6 3 4 5 6 PUMY-P300YBM 1 2 3 4 5 6 3 4 5 6 SYMBOL...
  • Page 24 NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH760...
  • Page 25 7-2. REFRIGERANT SYSTEM DIAGRAM 7-2-1. Connection without Branch box Refrigerant flow in cooling Refrigerant flow in heating Thermistor (TH7) Check valve Service port 4 way valve Refrigerant Strainer Gas pipe <280: 7/8, 335: 1> Thermistor (TH6) Ball valve Solenoid High pressure ...
  • Page 26 7-2-2. Connection with Branch box In case of using 1-branch box Selecting pipe size (Fig. 7-1) Flare connection employed. (No. brazing) Model Liquid pipe Gas pipe Branch box P250 ø9.52 ø22.2 P300 ø12.7 ø25.4 Total down-stream capacity Model Liquid pipe Gas pipe of indoor units P250...
  • Page 27 7-2-3. Mixed system (CITY MULTI indoor units and M series indoor units [Via Branch box]) Model Liquid pipe Gas pipe A Outdoor unit P250 ø9.52* ø22.2 B First joint P300 ø12.7 ø25.4 C Branch header D Branch box B, C, D, E E CITY MULTI Indoor unit F M series Indoor unit Total down-stream capacity...
  • Page 28 7-3. SYSTEM CONTROL 7-3-1. 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 a.
  • Page 29 • Name, Symbol and the Maximum Remote controller Units for Connection Name Symbol Maximum units for connection — Outdoor unit CITY MULTI series M-IC Refer to "2-1. SYSTEM CONSTRUCTION". Indoor unit M-NET remote controller M-NET RC Maximum 2 M-NET RC for 1 indoor unit, Maximum 12 M-NET RC for 1 OC Permissible Lengths Constraint items •...
  • Page 30 B. Example of a group operation system with 2 or more outdoor units and an M-NET remote controller. (Address settings are necessary.) M-IC M-IC M-IC (51) 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 31 • 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 m (1.25 mm²) • M-NET Remote controller cable length: R [ 10 m (0.5 to 1.25 mm²) If the length exceeds 10 m, use a 1.25 mm²...
  • Page 32 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 33 Permissible Lengths Constraint items The MA remote controller and the M-NET remote controller cannot be used together with Longest transmission cable length: the CITY MULTI series indoor unit of the same group. [ 200 m (1.25 mm²) M-NET remote controller cannot be connected without address setting. MA remote controller cable length: [ 200 m (0.3 to 1.25 mm²) (00)
  • Page 34 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 35 • 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 [ 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) M-IC...
  • Page 36 E. Example of a system using Branch Box and A-Control indoor unit TB3A TB5/TB15 Branch Box A-IC MA-RC (01) TB3B TB5/TB15 A-IC MA-RC (02) (51) TB3C TB5/TB15 A-IC M1 M2 S M1 M2 S MA-RC (03) (01) TB3D A-IC WL-RC (04) TB3E A-IC...
  • Page 37 • Name, Symbol, and the Maximum Units for Connection Longest length via outdoor unit (M-NET cable): L [ 500 m (1.25 E or more) Longest transmission cable length (M-NET cable): L [ 200 m (1.25 E or more) Longest transmission cable length (A-Control cable): L [ 25 m (1.5 E) Remote controller cable length: m [ 200 m (0.3 to 1.25 E)
  • Page 38 Example of a system using Branch Box and A-Control indoor unit Branch Box TB3A TB5/TB15 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 WL-RC (04) TB3E A-IC WL-RC (05)
  • Page 39 • Name, Symbol, and the Units for Connection Longest length via outdoor unit (M-NET cable): L [ 500 m (1.25 E or more) Longest transmission cable length (M-NET cable): L [ 200 m (1.25 E or more) Longest transmission cable length (A-Control cable): L [ 25 m (1.5 E) Remote controller cable length: m [ 200 m (0.3 to 1.25 E)
  • Page 40 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 41 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 Check...
  • Page 42 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 43 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 continuously for 5 minutes shortage of refrigerant ●exceeds 125 Defective thermistor...
  • Page 44 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 45 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 MPa) Clogged or broken pipe Malfunction or locked outdoor fan motor (2) High pressure abnormality (63HS detected)
  • Page 46 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 47 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 48 Check code High pressure trouble 1302 (UE) Chart 4 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the SV1. Is the connector for outdoor multi controller circuit board 63H Reconnect the connector or connect it tightly.
  • Page 49 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 or less (*) for 5 Disconnection or loose connection of TH4 minutes even though the indoor LEV has minimum open pulse after the Defective holder of TH4 compressor starts operating for 10 minutes.
  • Page 50 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 51 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 52 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 53 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 (LEV-A)(blockage) When both of the following temperature conditions have been satisfied for 20 minutes or more during cooling operation.
  • Page 54 Check code Freeze protection of branch box or indoor unit 1503 (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 the unit in STOP.
  • Page 55 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 56 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of compressor is detected within 30 seconds since the Closed stop valve compressor starts operating. Decrease of power supply voltage Looseness, disconnection or converse of compressor wiring connection Incorrect DIP-SW setting of model selection on the...
  • Page 57 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. Set the model selection switch correctly, Are they set properly? then restart.
  • Page 58 Compressor overcurrent interruption/failure in Check code 4210 12 VDC power supply circuit on power circuit board (UP) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of compressor is detected after 30 seconds since the Closed outdoor stop valve compressor starts operating.
  • Page 59 Compressor overcurrent interruption/failure in Check code 4210 12 VDC power supply circuit on power circuit board (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.
  • Page 60 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 (3-phase only) ●...
  • Page 61 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 62 Check code Heat sink temperature trouble 4230 (U5) Abnormal points and detection methods Causes and checkpoints If TH8 detects a temperature outside the specified range during Blocked outdoor fan compressor operation. Malfunction of outdoor fan motor Blocked airflow path TH8: Thermistor Rise of ambient temperature Characteristic defect of thermistor Malfunction of input circuit on outdoor power circuit board...
  • Page 63 Check code Power module trouble or overcurrent trouble 4250 (U6) Abnormal points and detection methods Causes and checkpoints If overcurrent of DC bus or compressor is detected 30 seconds after the Closed outdoor stop valve compressor starts operating. To determine the source of abnormality, Decrease of power supply voltage either the compressor or the power module, drive the power module Disconnection, looseness or conversed connection...
  • Page 64 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 65 Check code Compressor temperature thermistor (TH4) open/short 5101 (U3) 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 66 Check code Suction pipe temperature thermistor (TH6) open/short 5102 (U4) 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 67 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 68 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 or less Characteristic defect of thermistor Short: 90°C or more TH7: Thermistor ...
  • Page 69 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 or less Characteristic defect of thermistor Short: 90°C or more TH2: Thermistor ...
  • Page 70 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 Open: −34.8°C or less Characteristic defect of thermistor Short: 102°C or more Defective outdoor multi controller circuit board TH8: Thermistor ...
  • Page 71 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 72 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 check code <5202>.
  • Page 73 Check code Current sensor trouble 5300 (UH) Abnormal points and detection methods Causes and checkpoints If the detected current sensor input value (primary current) during Decrease/trouble of power supply voltage compressor operation is outside the specified range. Disconnection of compressor wiring Input sensor trouble on outdoor power circuit board ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting...
  • Page 74 Check code Duplex address error 6600 (A0) Abnormal points and detection methods Causes and checkpoints If 2 or more units with the same address are 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 75 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 76 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 77 Check code Signal communication error with transmission processor 6606 (A6) Abnormal points and detection methods Causes and checkpoints If the data of unit/transmission processor were not normally transmitted. Accidental disturbance such as noise or lightning surge If the address transmission from the unit processor was not normally Hardware malfunction of transmission processor transmitted.
  • Page 78 Check code No ACK error 6607 (A7) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints Represents a common error detection The previous address unit does not exist since An abnormality detected by the sending side controller when receiving the address switch was changed while in electric no ACK from the receiving side, though signal was once sent.
  • Page 79 Check code No ACK error 6607 (A7) Chart 2 of 4 Abnormal points and detection methods Causes and checkpoints The cause of displayed address and attribute is on the Fresh Master While the indoor unit is operating with multi side refrigerant system Fresh Master, an abnormality An abnormality detected by the indoor unit if receiving no ACK when is detected when the indoor unit transmits signal...
  • Page 80 Check code No ACK error 6607 (A7) Chart 3 of 4 ●Diagnosis of defects Note: Make sure to turn the power OFF before connecting/disconnecting When the address of the outdoor unit is displayed as abnormal, the any connectors, or replacing boards. outdoor circuit board may be faulty.
  • Page 81 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 82 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 83 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 84 Check code MA communication receive error 6831,6834 (E0/E4) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".
  • Page 85 Check code MA communication send error 6832 6833 (E3/E5) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit. There are 2 remote controllers set as main. Malfunction of remote controller sending/receiving circuit Malfunction of sending/receiving circuit on indoor controller board...
  • Page 86 Check code MA communication send error 6832 6833 (E3/E5) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".
  • Page 87 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), check code <7100> is exceeds the specified capacity.
  • Page 88 Check code Capacity code error 7101 (EF) Abnormal points and detection methods Causes and checkpoints When a connected indoor unit is incompatible, check code <7101> is The model name of connected indoor unit (model code) displayed. is read as incompatible. The connectable indoor units are: ·...
  • Page 89 Check code Connecting unit number error 7102 (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor unit exceeds the limit, check code <7102> is Connecting more indoor units and branch boxes than displayed. the limit. If connecting status does not comply with the following limit;...
  • Page 90 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 "7-3. SYSTEM CONTROL". ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
  • Page 91 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 Check whether the M-NET RC (main) address is set in 000, or in the range of 101 to 150.
  • Page 92 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 93 8-2. REMOTE CONTROLLER DIAGNOSIS Refer to 12-8. "REMOTE CONTROLLER CHECK" for MA remote controller system. 8-3. THE FOLLOWING SYMPTOM 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).
  • Page 94 8-4. INTERNAL SWITCH FUNCTION TABLE PUMY-P250YBM PUMY-P300YBM The black square (■) indicates a switch position. Continue to the next page. OCH760...
  • Page 95 ■ The black square ( ) indicates a switch position. OCH760...
  • Page 96 8-5. 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 Maximum 10 m CN51 D Outdoor unit control board : Error display lamp : Compressor operation lamp X, Y: Relay (coil rating: ≤...
  • Page 97 8-6. HOW TO CHECK THE PARTS Parts name Checkpoints Thermistor (TH2) Disconnect the connector then measure the resistance with a multimeter. (At the ambient temperature 10 to 30°C) Thermistor (TH3) Normal Abnormal 160 to 410 kΩ Thermistor (TH4) ...
  • Page 98 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.
  • Page 99 8-7. HOW TO CHECK THE COMPONENTS Low temperature thermistors • Thermistor (TH2) • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) Thermistor R0 = 15 kΩ ± 3 % B constant = 3480 ±...
  • Page 100 • 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 101 • 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 102 8-8. TEST POINT DIAGRAM Outdoor multi controller circuit board TEST POINT 1 is high voltage. Model selection Function selection CN51 External signal Test run Pump down Manual defrost Model selection output CN102 Function selection Connect to the M-NET P.B SWP2 (CN2) (M-NET power circuit board)
  • Page 103 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check of Diode module (DS10) L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1 2.
  • Page 104 M-NET power circuit board Connect to the outdoor multi controller board (CN102) 1–2: 24–30 VDC 3–4: 24–30 VDC Connect to the electrical Connect to the outdoor noise parts box filter circuit board (CNAC1) 1–3: 220-240 VAC OCH760...
  • Page 105 Outdoor noise filter circuit board CNCT Primary current Connect to the outdoor power circuit board (CN5) Connect to the electrical parts box CNDC LO1, LO2, LO3 Connect to the outdoor POWER SUPPLY multi controller circuit LO1-LO2/LO2-LO3/ board (CNDC) LO3-LO1: 400 VAC input Connect to the outdoor CNAC2...
  • Page 106 SW: setting 8-9. OUTDOOR UNIT FUNCTIONS 0..OFF 1..ON OCH760...
  • Page 107 OCH760...
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  • Page 111 ELECTRICAL WIRING This chapter provides an introduction to electrical wiring for the Power Multi series, together with notes concerning power wir- ing, 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.
  • Page 112 3N ~ 380-400-415 V, 50 Hz ~ /N 220-230-240 V, 50 Hz L1/L2/L3/N 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 E CITY MULTI series Indoor unit...
  • Page 113 Minimum Wire Cross-sectional area (mm²) Power supply *2 Breaker for Wiring *1 Breaker for Current Leakage Model Main Cable Ground PUMY-P250YBM 3N~ 380-400-415 V 50 Hz 32 A 32 A 30 mA 0.1 sec. or less Outdoor unit PUMY-P300YBM 3N~ 380-400-415 V 50 Hz 40 A 40 A 30 mA 0.1 sec.
  • Page 114 9-3. DESIGN FOR CONTROL WIRING Please note that the types and numbers of control wires needed by the Power Multi series will depend on the remote controllers and whether they are linked with the system. 9-3-1. Selection number of control wires M-NET remote controller Remote controller used in system control operations •...
  • Page 115 9-6. EXAMPLE EXTERNAL WIRING DIAGRAM FOR A BASIC SYSTEM ■ Example of system when using an M-NET controller Breaker for Wiring and Current Leakage 3N ~ 380-400-415 V, 50 Hz Outdoor unit Breaker for Wiring and Current Leakage Pull box /N 220-230-240 V, 50 Hz 1.25 mm ×...
  • Page 116 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 Power Multi series, will 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 117 REFRIGERANT PIPING TASKS 10-1. REFRIGERANT PIPING SYSTEM Line-Branch Method Connection Examples (Connecting to 5 Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+B+C+D+a+b+c+d+e [ 310 m Permissible Farthest Piping Length A+B+C+D+e [ 150 m Length Farthest Piping Length After First Branch B+C+D+e [ 30 m H [ 50 m (If the outdoor unit is lower, H [ 40 m) High/Low Difference in Indoor/Outdoor Section...
  • Page 118 Header-Branch Method Connection Examples (Connecting to 6 Indoor Units) Outdoor Unit First Branch C C C Indoor unit Total Piping Length A+a+b+c+d+e+f [ 310 m Permissible Farthest Piping Length A+ f [ 150 m Length Farthest Piping Length After First Branch f [ 30 m High/Low Difference in Indoor/Outdoor Section H [ 50 m (If the outdoor unit is lower, H [ 40 m)
  • Page 119 Note: Pipe re-branching after the header branching is not possible. Method of Combined Branching of Lines and Headers Outdoor unit Connection Examples First branching (branching joint) (Connecting to 5 Indoor Units) Branching joint Indoor unit Branching header Blind caps Permissible Total Piping Length A+B+C+a+b+c+d+e [ 310m Length...
  • Page 120 PUMY-P300YBM add liquid refrigerant directly to the check valve. Calculation of additional refrigerant charge Outdoor model: PUMY-P250YBM b1 + b2 + c1 + c2: ø9.52 30 m • Calculate the additional charge using the liquid Indoor 1: model 50 a1: ø6.35 15 m...
  • Page 121 A Outdoor Unit B First joint C Branch header D Branch box E CITY MULTI Indoor unit F M 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 [ 310 m Farthest piping length (L1) A+E+a or A+B+C+e [ 85 m Farthest piping length.
  • Page 122 A Outdoor Unit B First joint C Branch header D Branch box E CITY MULTI Indoor unit F M 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 [ 310 m Farthest piping length (L1) A+E+a [ 85 m Farthest piping length.
  • Page 123 A Outdoor unit B First joint C Branch header D Branch box E CITY MULTI indoor unit F M series indoor unit Mixed Method Connection Examples H*¹ (Connecting to 3 Branch boxes) A + G + B + C + D + F + E + a + b + c + d + e + f + g + h + i + j + k + l + m + n + o [ Total piping length 310 m Farthest piping length (L1)
  • Page 124 10-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 10-2-1. Introduction R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious. To prevent possible injury, the rooms should be large enough to keep the R410A concentration specified by ISO 5149-1 as follows.
  • Page 125 DISASSEMBLY PROCEDURE 11-1. OUTDOOR UNIT : Indicates the visible parts in the photos/figures. Note: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures. PHOTOS/FIGURES OPERATING PROCEDURE 1. Removing the panels on the right side of the unit Photo 1 Top panel fixing screws Top panel...
  • Page 126 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 (9) Remove electrical parts box fixing screws (5 × 12) and Electrical detach the electrical parts box by pulling it upward. parts box Electrical parts box fixing screws Fuse (1, 2) Electrical parts box fixing screws...
  • Page 127 PHOTOS/FIGURES OPERATING PROCEDURE Photo 9 6. Removing the thermistor (TH3) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel front. (See Photo 1) (4) Remove the cover panel rear. (See Photo 1) (5) Remove the side panel R.
  • Page 128 OPERATING PROCEDURE PHOTOS/FIGURES Photo 11 9. Removing bypass valve coil (SV1 and SV3) and bypass valve (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel front. (See Photo 1) Linear (4) Remove the cover panel rear.
  • Page 129 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 (3) Remove the cover panel front. (See Photo 1) (4) Remove the cover panel rear. (See Photo 1) Valve (5) Remove ball valve and stop valve fixing screws (5 ×...
  • Page 130 REMOTE CONTROLLER 12-1. REMOTE CONTROLLER FUNCTIONS (”x” represents 1 or later) Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 131 Display The main display can be displayed in two different modes: ˝Full˝ and ˝Basic˝. The initial setting is ˝Full˝. To switch to the ˝Basic˝ mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) ...
  • Page 132 Menu structure Main menu Press the button. Move the cursor to the desired item with the buttons, and press the button. Operation Vane · 3D i-See · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Vertical air direction Horizontal air direction Timer menu Timer...
  • Page 133 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Collect model names and serial No. Model name input Serial No.
  • Page 134 Main menu list Main Setting and display items Setting details menu Operation Vane · 3D i-See · Vent. Vane: Use to set the vertical air direction. (Vane.Vent. (Lossnay)) Louver: Use to set the horizontal air direction. 3D i-See sensor: This setting is available only for the air conditioners that support easy setting function of motion sensing air direction.
  • Page 135 Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated as setting setting a sub controller. Clock Use to set the current time. Daylight Set the daylight saving time. saving time Administrator The administrator password is required to make the settings for the following...
  • Page 136 Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
  • Page 137 Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
  • Page 138 Controller interface ▌1 Occupancy Sensor The occupancy sensor detects vacancy for energy saving control. ▌2 Brightness Sensor The brightness sensor detects the brightness of the room for energy saving control. ▌3 Temperature & Humidity Sensor The sensor detects the room temperature and the relative humidity. ▌4 LED Indicator The LED indicator indicates the operation status in different colors.
  • Page 139 12-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, date and time of occur- Error information rence, model name, and serial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 140 • Checking the error information While no errors are occurring, page 2/2 of the error information can be Maintenance menu viewed by selecting ˝Error information˝ from the Maintenance menu. Error information Filter information Errors cannot be reset from this screen. Cleaning Main menu: Cursor...
  • Page 141 12-3. SERVICE MENU Maintenance password is required 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Main Main menu *At the main display, the menu button and select ˝Service˝ to make Service the maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 142 12-4. TEST RUN 12-4-1. PAR-4xMAA (”x” represents 0 or later) 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Test run˝ with the F1 or F2 button, and press the [ ] button.
  • Page 143 12-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN 1. Turn on the main power to the unit. TEST RUN 2.
  • Page 144 12-4-4. PAR-U02MEDA Test run [MON] 10:45 Test run Fan speed Air direction Address Remain 2:00 　 ＞ 　 ＞ Pipe 　 ＞ 　 ＞ 9.0°C 　 ＞ 　 ＞ 　 ＞ 　 ＞ Swing Auto Louver LOSSNAY 　 ＞ 　 ＞ 　...
  • Page 145 12-5. FUNCTION SETTING 12-5-1. PAR-4xMAA (”x” represents 0 or later) Settings menu 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Function setting Lossnay Select ˝Setting˝ from the Service menu, and press the [ ] button. Service menu: Cursor Select ˝Function setting˝, and press the [...
  • Page 146 12-5-2. PAR-SL97A-E Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 147 12-5-3. PAR-SL100A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and ˝00˝ blinks. (Fig. 1) Press the button to set the ˝50˝. Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
  • Page 148 12-6. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Check˝ with the F1 or F2 button, and press the [ button. 2. Select ˝Error history˝ with the F1 or F2 button, and press Check menu the [ ] button.
  • Page 149 12-7. SELF-DIAGNOSIS 12-7-1. PAR-4xMAA (”x” represents 0 or later) 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Remote controller check Select ˝Check˝ from the Service menu, and press the [ ] button. Service menu: Cursor Select ˝Diagnosis˝...
  • Page 150 12-7-2. PAR-SL97A-E When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK •...
  • Page 151 12-8. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select ˝Service˝ from the Main menu, Diagnosis and press the [ ] button. Self check Remote controller check Select ˝Check˝ from the Service menu, Service menu: and press the [ ] button.
  • Page 152 12-9. SPECIAL FUNCTION OPERATION SETTING *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). (A) Group settings: Enter the indoor unit controlled by the remote controller, check the content of entries, and clear entries, etc.
  • Page 153 (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 154 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2021 MITSUBISHI ELECTRIC CORPORATION Published: May. 2021 No. OCH760 Specifications are subject to change without notice. Made in Japan...

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