Mitsubishi Electric PUMY-P125VMA Technical & Service Manual
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Mitsubishi Electric PUMY-P125VMA Technical & Service Manual

Mitsubishi Electric PUMY-P125VMA Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PMUP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R407C
Outdoor unit
[Model name]
PUMY-P125VMA
PUMY-P125YMA
OUTDOOR UNIT
[Service Ref.]
PUMY-P125VMA
PUMY-P125YMA
PUMY-P125YMA
CONTENTS
1. TECHNICAL CHANGE ·····································2
2. SAFETY PRECAUTION····································3
3. OVERVIEW OF UNITS······································5
4. SPECIFICATIONS ·············································8
5. DATA ·······························································10
6. OUTLINES AND DIMENSIONS ······················18
7. WIRING DIAGRAM ·········································19
9. TROUBLESHOOTING ····································34
10. ELECTRICAL WIRING····································72
11. REFRIGERANT PIPING TASKS ·····················75
12. DISASSEMBLY ···············································80
13. PARTS LIST ····················································86
2003
No.OC272
REVISED EDITION-A
Revision :
• PUMY-P125VMA and
PUMY-P125YMA
are
1
added in REVISED
EDITION-A.
• Please void OC272.
1

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PMUP AIR CONDITIONERS 2003 No.OC272 REVISED EDITION-A TECHNICAL & SERVICE MANUAL R407C Outdoor unit Revision : [Model name] [Service Ref.] • PUMY-P125VMA and PUMY-P125VMA PUMY-P125YMA PUMY-P125VMA added in REVISED PUMY-P125YMA EDITION-A. • Please void OC272. PUMY-P125YMA PUMY-P125YMA CONTENTS 1.

  • Page 2: Technical Change

    TECHNICAL CHANGE PUMY-P125YMA PUMY-P125YMA 1. Addition of new function (Auto Change Over) PUMY-P125YMA : Not equipped PUMY-P125YMA : Equipped 2. Difference of operation switching logic for the outdoor output connector (CN3D) PUMY-P125YMA : CN3D 1-2 ······ OPEN : Heating CLOSE : Cooling PUMY-P125YMA : CN3D 1-2 ······...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION Cautions for using with the outdoor unit which adopts R407C refrigerant. · Do not use the existing refrigerant piping. -The old refrigerant and refrigerant oil in the existing piping contains a large amount of chlorine which may cause the refriger- ant oil of the new unit to deteriorate.
  • Page 4 [1] Service tools Use the below service tools as exclusive tools for R407C refrigerant. Tool name Specifications Gauge manifold ·Only for R407C. ·Use the existing fitting SPECIFICATIONS. (UNF 7/16) ·Use high-tension side pressure of 3.43MPa·G or over. Charge hose ·Only for R407C. ·Use pressure performance of 5.10MPa·G or over.

  • Page 5: Overview Of Units

    OVERVIEW OF UNITS 3-1. UNIT CONSTRUCTION PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA Outdoor unit Capacity Type 20~Type 125 Indoor unit Number of units that can be 1~8 units connected 50~130% of outdoor unit capacity Total system wide capacity CMY-Y62-C-E CMY-Y64-C CMY-Y68 CMY-S65 Branch header...

  • Page 6: Unit Specifications

    3-2. UNIT SPECIFICATIONS (1) Outdoor Unit PUMY-P125VMA PUMY-P125YMA Service Ref. PUMY-P125YMA Cooling (kW) 14.0 Capacity Heating (kW) 16.0 Motor for compressor (kW) Cooling / Heating capacity indicates the maximum value at operation under the following condition. w. Cooling Indoor : D.B. 27°C / W.B. 19.0°C Outdoor : D.B.

  • Page 7: System Layout

    Note: When the total capacity of indoor units exceeds the capacity of the outdoor unit (more than 100%), the rated power of each indoor unit will be less when they are running simultaneously. Outdoor unit PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA Indoor unit...

  • Page 8: Specifications

    SPECIFICATIONS Service Ref. Unit PUMY-P125VMA Item Rated Cooling capacity 14.0 Rated power consumption 6.10 Operating current 28.3-27.1-26.0 Operating power factor Starting current Rated Heating capacity 16.0 Rated power consumption 6.03 Operating current 28.0-26.7-25.7 Operating power factor Starting current Rated power supply...
  • Page 9 Service Ref. PUMY-P125YMA Unit Item PUMY-P125YMA Rated Cooling capacity 14.0 Rated power consumption 5.95 Operating current 9.6-9.1-8.8 Operating power factor Starting current Rated Heating capacity 16.0 Rated power consumption 5.58 Operating current 9.2-8.8-8.5 Operating power factor Starting current Rated power supply 3 phase 380-400-415V 50Hz External finish (Munsell colour-coded markings) Molten-galvanized steel plate (with polyester coating), ivory white <5Y 8/1>...

  • Page 10: Data

    DATA 5-1. COOLING AND HEATING CAPACITY AND CHARACTERISTICS 5-1-1. Method for obtaining system cooling and heating capacity: To obtain the system cooling and heating capacity and the electrical characteristics of the outdoor unit, first add up the ratings of all the indoor units connected to the outdoor unit (see table below), and then use this total to find the standard capacity with the help of the tables on page 11 to 14.
  • Page 11 5-2. STANDARD CAPACITY DIAGRAM 5-2-1. PUMY-P125VMA STANDARD CAPACITY DIAGRAM Before calculating the sum of total capacity of indoor units, please convert 240V, 50Hz the valve into the kW model capacity following the formula on page 8. Power consumption (kW) Current (A)
  • Page 12 5-2-2. PUMY-P125VMA STANDARD CAPACITY DIAGRAM Before calculating the sum of total capacity of indoor units, please convert the valve into the kW model capacity following the formula on page 8. 240V, 50Hzw Power consumption (kW) Current (A) Capacity (kW) Total capacity of...
  • Page 13 5-2-3. PUMY-P125YMA, PUMY-P125YMA STANDARD CAPACITY DIAGRAM Before calculating the sum of total capacity of indoor units, please convert 415V, 50Hz the valve into the kW model capacity following the formula on page 8. Power consumption (kW) Current (A) Total capacity of Capacity (kW) indoor units (kW) Cooling...
  • Page 14 5-2-4. PUMY-P125YMA, PUMY-P125YMA STANDARD CAPACITY DIAGRAM Before calculating the sum of total capacity of indoor units, please convert the valve into the kW model capacity following the formula on page 8. 415V, 50Hzw Power consumption (kW) Current (A) Capacity (kW) Total capacity of Cooling Cooling...

  • Page 15: Correcting Cooling And Heating Capacity

    Individual capacity under stated conditions = total capacity under the stated conditions o total capacity at the rated time (3)Capacity correction factor curve Figure 2. PUMY-P125VMA PUMY-P125YMA Figure 1. PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA PUMY-P125YMA Heating performance curve...
  • Page 16 (2) During heating, to find the equivalent piping length, first find the capacity ratio corresponding to standard piping length (5m) from Figure 4, and then multiply by the heating capacity from Figure 2 to obtain the actual capacity. (1) Cooling capacity correction factor Figure 3. PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA Cooling capacity correction curve Total capacity for indoor unit 0.95...
  • Page 17 PUMY-P125VMA NOTCH SPL(dB) LINE PUMY-P125YMA PUMY-P125YMA NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MICROPHONE...

  • Page 18: Outlines And Dimensions

    OUTLINES AND DIMENSIONS • OUTDOOR UNITS unit : mm PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA...

  • Page 19: Wiring Diagram

    WIRING DIAGRAM PUMY-P125VMA SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block(Power Supply) Magnetic Contactor N.F. Noise Filter Circuit Board CNS1 Connector(Multi system) Terminal Block(Transmission) 21S4 4-Way Valve Connection Lead(L-Phase) CNS2 LI/LO Connector(Centralized Control) Solenoide Valve(Hot Gas Bypass) Connection Lead(N-Phase)
  • Page 20 PUMY-P125YMA SYMBOL SYMBOL NAME NAME SYMBOL NAME SYMBOL NAME THERMISTOR C1,C2 FAN MOTOR CAPACITOR SOLENOID VALVE <HOT GAS BYPASS> ACCT CONNECTOR <CURRENT DETECTION> <LOW PRESSURE SATURATED DIODE MODULE SWITCH <DISPLAY SELECTION> CB1,CB2 SMOOTHING CAPACITOR TEMPERATURE DETECTION> THERMISTOR REACTOR SWITCH <FUNCTION SELECTION> CONNECTOR <POWER SUPPLY>...
  • Page 21 PUMY-P125YMA SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME ACCT CONNECTOR <CURRENT DETECTION> C1,C2 FAN MOTOR CAPACITOR SOLENOID VALVE <HOT GAS BYPASS> THERMISTOR <LOW PRESSURE SATURATED TEMP. DETECTION> CB1,CB2 SMOOTHING CAPACITOR DIODE MODULE SWITCH <DISPLAY SELECTION> CONNECTOR <POWER SUPPLY> REACTOR SWITCH <FUNCTION SELECTION>...

  • Page 22: Necessary Conditions For System Construction

    NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 8-1. TRANSMISSION SYSTEM SETUP...
  • Page 23 Outdoor heat exchanger of suction pressure) Capillary Compressor tube 2 (MC) Strainer Thermistor THHS (Radiator panel Accumulator temperature sensor) Capillary W Only PUMY-P125VMA tube 4 Expansion valve (LEV(A), SLEV) Thermistor THHS-A Flare Thermistor THHS-B Dryer Strainer Overcooling heat exchanger #100 Strainer #100...

  • Page 24: System Control

    8-3. SYSTEM CONTROL 8-3-1. Operating a Single Refrigerant System When operating either alone or as part of a group, a M-NET remote controller (NR) may be used to control a single refrigerant system that does not overlap with any other system. <Example of system arrangement>...
  • Page 25 MA Remote controller Unnecessary address setting (Necessary main/sub setting) — w w The address automatically becomes “100” if it is set as “01~50”. (PUMY-P125VMA) 2) Indoor unit that may be connected with an SC are shown as follows. Centralized controller...
  • Page 26 8-3-3. Example for the System • Example for wiring control cables, wiring method and address setting, permissible lengths, and the prohibited items are listed in the standard system with detailed explanation. The explanation for the system in this section : Use one single outdoor unit and multiple outdoor units for M-NET remote control system.
  • Page 27 • Name, Symbol and the Maximum Remote controller Units for Connection Symbol Name Maximum units for connection Outdoor unit Indoor unit One OC unit can be connect to 1-8 IC units M-NET remote Maximum two NR for one indoor unit, Maximum 16 NR for one OC controller Permissible Lengths Prohibited items...
  • Page 28 B. Example of a group operation system with two or more outdoor units and a M-NET remote controller. (Shielding wires and address settings are necessary.) Between terminal blocks Group 1 Group 3 Group 5 CN40 (051) (001) (004) (005) (006) TB15 TB15 TB15...
  • Page 29 • Name, Symbol, and the Maximum Units for Connection • Max length via outdoor units : L [ 500 meters (1.25mm [ 200 meters (1.25mm • Max transmission cable length : L [ 10 meters (0.5 to 0.75mm • Remote controller cable length : R If the length exceeds 10 meters, use a 1.25 mm shielded wire.
  • Page 30 C. Example of a MA remote controller system (address setting is not necessary.) NOTE : In the case of same group operation, need to set the address that is only main indoor unit. Example of wiring control cables Wiring Method and Address Setting 1.
  • Page 31 Permissible Lengths Prohibited items The MA remote controller and the Longest transmission cable length [ 200m (1.25 mm M-NET remote controller cannot be used together with the indoor unit MA remote controller cable length [ 200m (0.3 ~ 1.25 mm the of the same group.
  • Page 32 D. Example of a group operation with two or more outdoor units and a MA remote controller. (Shielding wires and address settings are necessary.) Between terminal blocks Group 1 Group 5 Group 3 CN40 CN41 (051) (001) (004) (005) (006) TB5 TB15 TB5 TB15 TB5 TB15...
  • Page 33 • Name, Symbol, and the Maximum Units for Connection • Max length via outdoor units : L [ 500 meters (1.25mm [ 200 meters (1.25mm • Max transmission cable length : L [ 10 meters (0.5 to 0.75mm • Remote controller cable length : R If the length exceeds 10 meters, use a 1.25 mm shielded wire.

  • Page 34: Troubleshooting

    TROUBLESHOOTING 9-1. CHECK POINTS FOR TEST RUN 9-1-1. Procedures of test run (1) Before test run, make sure that following work is completed. • Installation related : Make sure that the panel of cassette type and electrical wiring is done. Otherwise electrical functions like auto vane will not operate normally.
  • Page 35 9-1-2. Special Function Operation and Settings (for M-NET Remote Controller) • It is necessary to perform “group settings” and “paired settings” at making group settings of different refrigerant systems (multiple outdoor unit). (A) Group settings: Enter the indoor unit controlled by the remote controller, check the content of entries, and clear entries, etc.
  • Page 36 (2) Address check: Refer to section (1) regarding address entry. a) In making group settings: • Turn off the remote controller: Press the remote controller's ON/OFF button to stop operation (the indicator light will go off). • Locate the indoor unit address display mode: Press the FILTER and k buttons on the remote controller simultaneously and hold for two seconds.
  • Page 37 Address set error 5106 Outdoor temperature sensor trouble (TH6) 7111 Remote controller sensor trouble ACTM/IGBT Radiator panel thermistor trouble (THHS-A/B) 0403 Communication trouble with Power Board (PUMY-P125VMA) (PUMY-P125VMA) 5110 IPM Radiator panel thermistor trouble (THHS) (PUMY-P125YMA, PUMY-P125YMA Pressure sensor trouble (63HS) 5201...
  • Page 38 Display Meaning and detecting method Check points Causes 1102 Discharge temperature abnormality 1) Gas leakage, Gas shortage When the discharge temperature thermistor Check the refrigerant amount. (TH1) detects 125 or more (1st detection), Check the indoor/outdoor unit operating 2) Overloaded operation the compressor stops and restarts operation condition and status.
  • Page 39 Display Meaning and detecting method Check points Causes 1302 5) Indoor fan motor lock Check the indoor fan motor. When the sensor detects 2.94MPa or more again (2nd detection) within 30 minutes 6) Indoor fan motor failure Check the indoor fan motor. since the compressor has stopped, the 7) 4-way valve performance failure Change COOL/HEAT operation mode...
  • Page 40 Display Meaning and detecting method Check points Causes 1500 2. The compressor has operated 4) Discharge super heat detection error consecutively 20 minutes or more, since High-pressure pressure sensor Check the high-pressure pressure the indoor unit operation capacity had failure sensor.
  • Page 41 Display Meaning and detecting method Check points Causes Vacuum operation protection 1505 1) Ball valve performance failure (not Check the ball valve is full opened. When the suction pressure saturation full opened.) temperature thermistor (TH2) detects -13; or less and ''[indoor temperature-liquid pipe 2) Light-loaded operation (When outer Check the indoor/outdoor unit temperature][ 8deg'' for 3minutes...
  • Page 42 For 30minutes after the compressor stop board. (PUMY-P125VMA : 4minutes), it is being to delay abnormal stop. Then, when SW1 is set, the outdoor units address No. and check code <4165> blinks on the 4 digit digital display alternately.
  • Page 43 (2) In the case of abnormality without fan operation, replace the indoor power board. 4220 PUMY-P125VMA Abnormality such as overvoltage or voltage 1) Decrease of power supply voltage Check the facility of power supply. shortage and abnormal...
  • Page 44 (THHS) detects abnormality on When there is a big difference between 3rd time during delay abnormality, it stops the detected temp. and thermistor abnormally. (PUMY-P125VMA : 5 minutes) temp. replace the multi controller Then, the outdoor unit address No. check board.
  • Page 45 30seconds after 7th start-up 7) IPM (intelligent power module) compressor starts once, and restarts (PUMY-P125VMA : after 15th start-up), drive signal output circuit defective, in 3minutes. or the compressor is interrupted during power factor detecting circuit failure...
  • Page 46 Check the compressor. In case of 10), recheck the compressor again after 12 hours with former power supply. PUMY-P125VMA 1) Stop valve of outdoor unit is closed. Open stop valve. 2) Decrase of power supply voltage Check facility of power supply.
  • Page 47 Display Meaning and detecting method Check points Causes 5102 Liquid pipe temperature thermistor (TH22) abnormality When the thermistor detects short/open 1) Connector (CN21) contact failure Check whether the connector during the operation, the operation stops (CN21) in the indoor controller board and the operation changes to protect mode is connected or not.
  • Page 48 Display Meaning and detecting method Check points Causes 5103 Gas pipe temperature thermistor (TH23) abnormality 1) Connector (CN29) contact failure Check whether the connector (CN29) When the thermistor detects short/open in the indoor controller board is after 3minutes-continuous thermo ON connected or not.
  • Page 49 -99.9: Open Short: 88; or more (0.4k') 999.9: Short Open: -39; or less (115k') 5110 PUMY-P125VMA: Radiator panel temperature thermistor (THHS-A, THHS-B) abnormality PUMY-P125YMA, PUMY-P125YMA IPM radiator panel temperature thermistor (THHS) abnormality When controller detects short/open in...
  • Page 50 2) Defective circuit of current sensor on compressor. (This error is ignored in case of SW6-3 ON. outdoor power board Replace outdoor power board. (PUMY-P125VMA)) 6600 Duplex address error Look for the unit, which is source of Detected error when transmission of unit 1) There are 2units or more with the abnormality with the same address.
  • Page 51 Display Meaning and detecting method Check points Causes 6603 Transmission bus busy error Over error by collision 1) The transmission processor cannot Check whether the transmission line be transmitted since a short cycle of the indoor unit, fresh master, Abnormality when the state, which cannot voltage of the noise etc.
  • Page 52 Display Meaning and detecting method Check points Causes No ACK 6607 Factor that not related to origin Abnormality which controller of the 1) Since the address switch was Turn off power supply of outdoor unit, sending side detects when there is no changed with the current passed, the indoor unit fresh master and lossnay answer (ACK) from other side though data...
  • Page 53 Display Meaning and detecting method Check points Causes 3) When the cause of displayed address 1) When operating with multi refrigerant 6607 and attribute is on the remote controller system indoor units, the indoor units side transmits the signal to the remote controller after the other refrigerant (The indoor unit detects when there is no system outdoor unit is turned off or...
  • Page 54 Display Meaning and detecting method Check points Causes 6607 2) When synchronized operating with other refrigerant system lossnay, the indoor units transmits the signal to the lossnay after the lossnay and same refrigerant system outdoor unit is turned off or turned on again in 2minutes, and detects abnormality 3) Contact failure of lossnay or indoor unit transmission line...
  • Page 55 Display Meaning and detecting method Check points Causes 6810 UR communication abnormality (UR: Unit Remote controller) Communications between the unit remote 1) Contact failure of the unit remote Check whether the transmission line controller and indoor unit is not normal. controller transmission line in the unit of the indoor unit or unit remote remote controller or indoor unit.
  • Page 56 Display Meaning and detecting method Check points Causes When connected total models of the 1) Connecting total models of the Check the total models of connected 7100 indoor units exceed the specified level indoor unit exceed the specified level. indoor unit. (130% of the outdoor unit models), error code <7100>...

  • Page 57: Remote Controller Diagnosis

    Display Meaning and detecting method Check points Causes 7105 Address setting error Address setting of the outdoor unit is Addresses miss setting of the outdoor Check the address setting of the wrong. unit. outdoor unit. The address should be set in 000 or 51-100. The outdoor unit is not set in 000 or in the range of 51-100.
  • Page 58 From the preceding page. Potential problems other than those diagnosed for the remote controller. a) Single transmission not possible if error display 2 (“6832 or 6833”) flashes. There is “noise” on the transmission line, or damage of other remote controller for the indoor units can be considered.
  • Page 59 (2) For MA 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 • Wiring between indoor units in same group is not finished. abnormality occurs.
  • Page 60 9-5. INTERNAL SWITCH FUNCTION TABLE 9-5-1. Outdoor unit internal switch function table (PUMY-P125VMA) Operation in Each Switch Setting Switch Step Function Remarks When to Set <Factory Settings> SW U1 1st digit Before turning W The address automatically becomes the power on "100"...
  • Page 61 9-5-2. Outdoor unit internal switch function table (PUMY-P125YMA, PUMY-P125YMA Operation in Each Switch Setting Switch Step Function Remarks When to Set <Factory Settings> SW U1 1st digit Before turning SW U2 the power on 2nd digit SWU3 SWU2 SWU1 SWU3 SWU2 SWU1 SW U3...
  • Page 62 CN3D Preparations Maximum cable in the field length is 10m X, Y : Relay (DC1mA) Cooling Heating PUMY-P125YMA PUMY-P125VMA Heating Cooling PUMY-P125YMA PUMY-P125VMA Validity of SW1 Invalidity of SW1 PUMY-P125YMA PUMY-P125YMA For the system utilizing R-Converter units (PAC-SF29LB), the following systems are not available.
  • Page 63 9-7. HOW TO CHECK THE PARTS PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA Parts name Check points •Thermistor (TH1) Disconnect the connector then measure the resistance using a tester. (Surrounding temperature 10:~30:) <Discharge temperature detection> Normal Abnormal •Thermistor (TH2) <Low pressure saturated 160k"~410k" temperature detection>...
  • Page 64 From the preceding page. PUMY-P125VMA Medium temperature thermistor •Thermistor (THHS A/B) <Radiator panel> Thermistor R50 = 17k' ± 2% B constant = 4150k' ± 3% =17exp{4150( 273+t – 323 )} 180k' 50k' 17k' Temperature (:) PUMY-P125YMA, PUMY-P125YMA Medium temperature thermistor •Thermistor (THHS) <IPM radiator panel temperature thermistor detection>...
  • Page 65 Expansion valve (LEV(A), SLEV: Outdoor unit) 1 1 Notes on expansion valve action • LEV(A), SLEV to stepping motor ON/OFF after outdoor controller board has received pulse signal. • The valve position can be changed according to the pulse signal number ratio. <connection between the LEV(A), SLEV and the outdoor controller board>...
  • Page 66 From the preceding page. 3 Troubleshooting Problem Check point Corrective measure Malfunction in microp- Remove the connector from the controller board and connect diagnostic Replace the indoor unit rocessor operating LEDs. controller board or circuit Replace the outdoor multi controller board. 1k"...
  • Page 67 SW:setting 0..OFF 9-8. OUTDOOR UNIT FUNCTIONS 1..ON...

  • Page 72: Electrical Wiring

    (5) It is suggested that you consult with your electric power company concerning restrictions on electrical specifications. 10-2. WIRE DIAMETER AND MAIN POWER SWITCH CAPACITY 10-2-1. Wiring diagram for main power supply • PUMY-P125VMA Circuit breaker Power supply Outdoor unit...
  • Page 73 10-3. DESIGN FOR CONTROL WIRING Please note that the types and numbers of control wires needed by the CITY MULTI-S series will depend on the remote controllers and whether they are linked with the system. 10-3-1. Selection number of control wires M-NET remote controller Remote controller used in system control operations.
  • Page 74 10-4. SYSTEM SWITCH SETTING In order to identify the destinations of signals to the outdoor units, indoor units, and remote controller of the MULTI-S series, each microprocessor must be assigned an identification number (address). The addresses of outdoor units, indoor units, and remote controller must be set using their settings switches.

  • Page 75: Refrigerant Piping Tasks

    REFRIGERANT PIPING TASKS 11-1. REFRIGERANT PIPING SYSTEM Line-Branch Method Connection Examples (Connecting to Four Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+B+C+a+b+c+d is 100 meters or less Permissible Farthest Piping Length A+B+C+d is 70 meters or less Length Farthest Piping Length After First Branch B+C+d is 30meters or less...
  • Page 76 Header-Branch Method Connection Examples (Connecting to Four Indoor Units) Outdoor Unit First Branch Indoor unit Total Piping Length A+a+b+c+d is 100 meters or less Permissible Farthest Piping Length A+d is 70 meters or less Length Farthest Piping Length After First Branch d is 30 meters or less High/Low Difference in Indoor/Outdoor Section 30 meters or less (If the outdoor unit is lower, 20 meters or less)
  • Page 77 Note: The total of downstream unit models in the table is the total of models as seen from point A in the figure above. Note: Pipe re-branching after the header branching is not possible. Method of Combined Branching of Lines and Headers Connection Examples (Connecting to Five Indoor Units)
  • Page 78 Multi-distribution piping on outdoor unit Connection Examples (Connecting up to Five Indoor Units) *If multi-distribution piping on outdoor unit is done, a maximum of 5 indoor units can be Outdoor Unit connected. Cannot redistribute the piping. First Branch Indoor unit Total Piping Length a+b+c+d+e is 100 meters or less Permissible...

  • Page 79: Precautions Against Refrigerant Leakage

    11-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 11-2-1. Introduction (2) Calculate room volumes (in K) and find the room with the smallest volume R-22 refrigerant of this air conditioner is non-toxic and non- flammable but leaking of large amount from an indoor unit The part with represents the room with the smallest into the room where the unit is installed may be deleterious.

  • Page 80: Disassembly

    DISASSEMBLY Service Ref. : PUMY-P125VMA 1. Please pay attention to safety when assembling or disassembling heavy items. 2. The refrigerant system must be vacuum-pumped before performing piping maintenance. PUMY-P125YMA PUMY-P125YMA OPERATING PROCEDURE PHOTOS Photo 1 Top panel 1. Side and top panel disassembly procedures:...
  • Page 81 Rear panel Heat exchanger Photo 5 4. Electrical parts box disassembly procedures: PUMY-P125VMA [PUMY-P125VMA] (1) Remove the side panel (See photo 1) (2) Remove the top panel (See photo 1) (3) Disconnect the following wires from the Power circuit board Board plate multi controller board.
  • Page 82 OPERATING PROCEDURE PHOTOS Photo 6 5. Electrical parts box disassembly procedures: PUMY-P125YMA, PUMY-P125YMA [PUMY-P125YMA, PUMY-P125YMA Remove the side panel (See photo 1) Remove the top panel (See photo 1) Disconnect the following wires from the Board plate Power supply board multi controller board.
  • Page 83 OPERATING PROCEDURE PHOTOS Photo 8 7. Thermistor disassembly procedures: separator (1) Remove the side panel (See photo 1) Piping cover (2) Remove the top panel (See photo 1) (3) Remove the electrical parts box (See photo 5 or 6) Thermistor (4) Recover gas from the refrigerant circuit.
  • Page 84 OPERATING PROCEDURE PHOTOS Photo 11 Pipe of heat exchanger inlet (T connector) 10. Four-way valve disassembly procedures: (1) Remove the side panel (See photo 1). (2) Remove the top panel (See photo 1). (3) Remove the electrical parts box (See photo 5 or 6). Accumulator inlet (4) Recover gas from the refrigerant circuit.
  • Page 85 OPERATING PROCEDURE PHOTOS Photo 14 13. High pressure sensor (63HS)disassembly procedures: (1) Remove the side panel (See photo 1). fixing screw (2) Remove the high pressure sensor wire. (3) Recover gas from the refrigerant circuit. (4) Remove the welded portion of high pressure sensor. (5) Remove the mounting screw fastening the high pressure sensor mounting plate (1 pc : 4o10).

  • Page 86: Parts List

    PARTS LIST ELECTRICAL PARTS PUMY-P125VMA ty/set Price Wiring Recom- Remarks Part No. Part Name Specification Diagram mended PUMY- (Drawing No.) Symbol Unit Amount P125VMA R01 580 255 FAN MOTOR CAPACITOR 3.5µF 440VAC C1,2 T7W E19 315 MULTI CIRCUIT BOARD M.B.
  • Page 87 ELECTRICAL PARTS PUMY-P125YMA PUMY-P125YMA 13 VARISTOR ty/set Price Wiring Recom- Remarks PUMY-P125 Part No. Part Name Specification Diagram mended (Drawing No.) Symbol Unit Amount YMA YMA R01 580 255 FAN MOTOR CAPACITOR 3.5µF 440VAC C1,2 T7W E02 239 FUSE 2A 250V FUSE2 T7W 520 239 FUSE...
  • Page 88 FUNCTIONAL PARTS PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA...
  • Page 89 Part number that is circled is not shown in the figure. ty/set Price Wiring Recom- Remarks PUMY-P125 Part No. Part Name Specification Diagram mended (Drawing No.) Symbol Unit Amount YMA YMA PROPELLER R01 KL5 115 R01 30L 097 R01 35A 202 THERMISTOR (DISCHARGE TEMPERATURE DETECTION) R01 E00 268 HIGH PRESSURE SENSOR...
  • Page 90 STRUCTURAL PARTS PUMY-P125VMA PUMY-P125YMA PUMY-P125YMA 13 SCREW ty/set Price Remarks Wiring Recom- PUMY-P125 Part No. Part Name Specification Diagram mended (Drawing No.) Symbol Unit Amount YMA YMA R01 KN4 675 FAN GUARD R01 38A 668 FRONT PANEL R01 KL5 655...
  • Page 92 HEAD OFFICE : MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Sep. 2003 No.OC272 REVISED EDITON-A PDF 11 Distributed in Dec. 2001 No.OC272 PDF 300 New publication, effective Sep. 2003 Made in Japan.

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