TECHNICAL & SERVICE MANUALSPLIT-TYPE,HEAT PUMP AIR CONDITIONERSCONTENTS1. FEATURES ···········································32. PART NAMES AND F

10Service Ref.Power supply(phase, cycle,voltage)External finishHeat exchangerBooster heaterOperation control & ThermostatNoise level(Low-High)Cond

11DATA41. PERFORMANCE DATA1) COOLING CAPACITYNote C A :Capacity (W)P.C.:Power consumption (kW)Cooling capacity correction factorsP.C.3.623.723.833.963

122) HEATING CAPACITYNote C A :Capacity (W)P.C.:Power consumption (kW)Heating capacity correction factorsP.C.3.373.633.893.754.044.334.835.205.572.305

13Input (kW)Current (A)Starting current (A)Input (kW)Current (A)Starting current (A)ModeCapacity (W)Total Input (kW)IndoorOutdoorPLH-3GK(H)B1.UKServic

14CapacityInputIndoor unit Service Ref.Phase,HzVoltsAmperesOutdoor unit Service Ref.Phase,HzVoltsAmperesDischarge pressureSuction pressureDischarge te

15OUTLINES AND DIMENSIONS51. INDOOR UNIT PLH-3GK(H)B1.UKUnit : mm (inch)35(1-3/8)75(2-15/16)55(2-5/32)Inspection hole(drain water lift-up mechanism)Re

16PLH-4GK(H)SB1.UKPLH-5GK(H)SB1.UKPLH-6GK(H)SB1.UKSuspension bolt pitchSuspension bolt pitch1305(51-3/8)TERMINAL BLOCKTERMINAL BLOCK30(1-3/16) (Drain

17Unit : mm2. REMOTE CONTROLLER18130Rear side wiring arrangement opening.120FILTERCHECK MODETEST RUNFILTERCHECK MODETEST RUN4683.5SW18SW17CAUTION

186WIRING DIAGRAMSYMBOLC1.2CN1<R.B>CN2<R.B>CN2L<I.B>CN51<I.B>OPDSF<I.B>F.C<I.B>FS1.2H1H2I.BLSMF1.2MVRBRT1RT2NAMEFA

19REFRIGERANT SYSTEM DIAGRAM7Indoor unitIndoor heat exchangerRefrigerant pipe(option)15.88mm( 5/8")(with heat insulator)Flexible tubeBall valv

208 OPERATION FLOW-CHARTSTARTPower circuitbreakerCheck SWON twiceOperation SWON“OFF” timer“ON” timerSTOPSet timecompleteSet timecomplete1NONONO NONONO

21COOL operationFour-way valve/OFFInitialCOOLINGNONONONONONOYESYESYESYESYESYESNOYESYESYESYESYESYESYESYESYESYESYESNONONONOYESNONONONONONONONONOw 8w 9Va

22w8—9 Refer to page 28~29.w12 When room temperature is 18°C or below, the compressor cannot operate.When room temperature rises over 18°C, the compre

23Heat operationinitialHEATINGVane setting notchVane intial settingdefrostingHeating areaDefrost releaseDefrost30 min. elapseOutdoor unit troubleFour-

249 MICROPROCESSOR CONTROL● Compressor andoutdoor fan : ON-OFF● Operation modechange :COOL-HEAT.1. OUTLINE OF MICROPROCESSOR CONTROL● OFF-ON switching

252. INDOOR UNIT CONTROL2-1 COOL operation(1) Compressor control1 3-minute time delayTo prevent overload, the compressor will not start within 3 minut

265 Coil frost protectionWhen indoor coil temperatuer becomes -15°C or below,coil frost protection will proceed as follows.<Start condition>Afte

27(3) Auto vane controlAuto vane position is set to 35degrees(SW5-3:OFF) or 20 degrees(SW5-3:ON) airflow at the start-up of COOL operation. Itcan then

28<Auto vane drive> (a) The auto vane is driven by a 2.5 rpm motor.(b) Discharge direction can be selected between the No.1 and No.2 setting. (I

29<DRY operation time chart>Minimum 3 minutes w1ONThermostatIndoor fanAuto vaneDrain pumpBooster heaterCompressorONONDRY MODEDRY MODEONONOFFOFF3

3FEATURES11.THE QUIETEST PERFORMANCE IN THE FIELD-39 PHONS(PLH-3GK(H)B.UK)Excellent noise suppression is achieved because of the turbofan’s large diam

304The compressor will not start when the room temperature is below 18°C.The compressor starts intermittent operation when the power is turned ON with

312-3 HEAT operationMinimum 3 minutes w2ONThermostatIndoor fanAuto vaneDrain pumpBooster heaterCompressorPower ON lampSTAND BY lampONONLOW or HIGHL

32(1) Compressor control13-minute time delayTo prevent overload, the compressor will not start within 3, minutes after stop.2The compressor runs when

33(3) Auto vane controlAuto vane operation can be changed between STOP mode (fixed operation) and SWING mode by AIR DISCHRGESWING/STOP button on the r

34(6) Indoor coil thermistor abnormality detectionAn abnormality can be detected during compressor ON, except for the following.●For the first 20 minu

FILTERCHECK MODETEST RUN352-4 AUTO operation (Automatic COOL/HEAT change over operation)(1) Initial mode1 When AUTO operation starts after unit OFF.●

FILTERCHECK MODETEST RUN36<How to operate>To change the air flow direction, press button.NOTE: Discharge direction can be set by the indoor dip

FILTERCHECK MODETEST RUNFILTERCHECK MODETEST RUN37<Timer function>AUTO STOP ·········The air conditioner stops after the set time lapses.AUTO ST

38(1) Indoor coil temperature codeDuring the test run, the indoor coil temperature code from 1 to 15 is displayed on the remote controller instead of

392-9 Interlock with ventilation system (LOSSNAY)Mr. SLIM/LOSSNAY interlock operation is available by using the optional parts listed below.(1) System

47.INCREASED DEHUMIDIFICATION WITH FAN PHASE CONTROL NEW ELECTRONICDEHUMIDI-FIER OPERATIONA new electronic dehumidifier mode,where fan speed is contro

402-10 Dip switch functionsEach figure shows the initial factory setting.1. On remote controller board(1) SW17(Address selector)SW17-1~6) For address

41(3) SW3 (Emergency operation switch)1 2Normal operationONOFF1 2For emergency coolingONOFF1 2For emergency heatingONOFF(4) SW5 (Model selector)(2) SW

422-11. INDOOR FAN CONTROL(1) Fan motor max. rotational frequency for PLH-GKHV(2) Quiet cycle controlTo prevent noise due to the sudden rise in fan ou

433. OUTDOOR UNIT CONTROL3-1 Outdoor fan controlThe rotational frequency of outdoor fan is phase-controlled according to the outdoor coil temperature.

44(1) Start conditions A. When all of the following conditions are satisfied, defrosting will start. However, when the bypass valve turns OFF,defrosti

45(3) Defrost intervalThe defrost interval time is determined as follows.● Initial defrost interval is 50 minutes.● The defrost interval after defrost

463-7 Service functions(1) Compulsory defrositng1When all of the following conditions are satisfied, pressing SW2 starts the compulsory defrosting.● D

47TROUBLESHOOTING10Symptom Cause Check pointsThe display “CENTRALLYCONTROLLED” on remotecontroller dose not disap-pear.1) Wrong address setting of rem

482. SELF DIAGNOSTIC FUNCTION WITH REMOTE CONTROLLER2-1 When malfunction occurs during operationWhen a malfunction occurs, the indoor and outdoor unit

49CheckcodeDiagnosis of malfunction Cause Check pointsEO Signal transmitting/receivingerror(Indoor controller does notrespond to remote controllersign

5PART NAMES AND FUNCTIONS2● Indoor (Main) UnitOn the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.Au

503.SERVICE DATA INDICATION BY SWITCHES ON OUTDOOR CONTROLLER BOARDSetting dip switchs SW2 and SW3 on the outdoor controller board enables LED to show

513-1 Outdoor coil temperatureTo obtain data on the outdoor coil temperature,add the number of bits of lighting LEDs, and seethe graph below to find t

52BlinkingLEDCause Check pointLD1 Reversed phase Phases L1, L2, and L3are con-nected improperly.Check the power supply connection.LD2Open phase ● Phas

536. WRONG WIRING ON SITE6-1 Between remote controller and indoor unitIf the wire is disconnected between the remote controller and the indoor unit, n

54LOSSNAY control switch does not work.LOSSNAY control switch can not work during interlock opera-tion.LOSSNAY control switch is effective only while

554-WAY AIR FLOW SYSTEM111. Placement of the air outlets●For this grill, the airflow direction comes in 11 patterns for PLH-3GK(H)B1.UK and in 6 patte

562.Adjusting the width of the air outlets (opening or closing fully)●For full closing…Install the insulation 4 or 5 furnished inthis kit, from the re

573-2 Fresh air intake amount & static pressure characteristicsP(Pa)50-50-100-150-2000StandardWith high efficiency filter1 2 3 4 5 Q(m /min) 3P(Pa

584.BRANCH DUCT(Installation at site)Discharge by branch duct becomes possible by installing a branch duce at site. Knockout holes on the wall panel o

594-3 Air flow & Static pressure characteristics of Branch Duct (with SWA at “Standard”)01020304050605101520Air flow (m /min)3HiLo750mmo2 directio

6Caution● Only the display lights when the unit is stopped and power supplied to the unit.● When power is turned ON for the first time the (CENTRA

6012SYSTEM CONTROL1 Group control witha single remotecontroller(See page 61.)UnitRemotecontrollerUnit UnitMany units, installed at different locations

612. GROUP CONTROL WITH A SINGLE REMOTE CONTROLLERA maximum of 50 units can be started in order according to the dip switch settings 2-1 How to wire(1

623. CONTROL USING TWO REMOTE CONTROLLERS : OPTIONAL REMOTE CNTROLLER (PAC-SK47RC)Two remote controllers can be used to control either one unit or a g

63NOTE1 : Install the relay box where you can be serviced it easily.NOTE2 : For control circuit wiring, use a wire of No. 14 AWG or a control cable ac

646. MULTIPLE REMOTE CONTROL DISPLAYYou can control serveral units with a multiple remote control display, bywiring an optional multiple display adapt

65DISASSEMBLY PROCEDURE13OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS1. Removing the intake grill(1) Slide the lever in the direction of the arrow 1.(

66OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS5. Removing the heater(Only PLH-3GK(H)B1, 4GK(H)SB1,PLH-5GK(H)SB1, 6GK(H)SB1)(1) Remove the fan guard.(

67OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS8. Removing the drain pan (1) Remove the panel.(2) Remove the fan guard.(3) Remove the bell mouth.(4) R

6814 PARTS LISTNo. Parts No. Parts NameSpecificationQ'ty / setPLH-3GKHB.UKGK(H)B1.UKRemarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ'tyU

69No. Parts No. Parts NameSpecificationQ'ty / setPLH-3GKHB.UKGK(H)B1.UKRemarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ'tyUnit AmountPri

7SPECIFICATIONS3Service Ref.Power supply(phase, cycle,voltage)External finishHeat exchangerBooster heaterOperation control & ThermostatNoise level

70No. Parts No. Parts NameSpecificationQ'ty / setPLH-4 PLH-5 PLH-6Remarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ'tyUnit AmountPrice123

71PANEL PARTSPLH-4GKHSB.UK PLH-5GKHSB.UKPLH-6GKHSB.UKPLH-4GK(H)SB1.UKPLH-5GK(H)SB1.UKPLH-6GK(H)SB1.UK2510101141011111101193861111No. Parts No. Parts N

72FUNCTIONAL PARTSPLH-3GKHB.UK PLH-3GK(H)B1.UK 62564331363234789141519202422233626303121292835131211101617182537

73No. Parts No. Parts Name SpecificationsQ'ty/setPLH-3GKHB.UKGKHB1.UKGKB1.UKRemarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ'tyUnit Amou

74FUNCTIONAL PARTSPLH-4GKHSB.UK PLH-5GKHSB.UKPLH-6GKHSB.UKPLH-4GKHSB1.UKPLH-5GKHSB1.UKPLH-6GKHSB1.UK89103646572735343541371516323337263728313038141112

75PUH-4.UKPUH-5.UKPUH-6.UKNo. Parts No. Parts Name SpecificationsGKHSBGKHSB1GKHSBGKHSB1GKHSBGKHSB1Remarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ

76FUNCTIONAL PARTSPLH-4GKSB1.UKPLH-5GKSB1.UKPLH-6GKSB1.UK3246572731303141371213282933223324272634118910141516171920211823356

77No. Parts No. Parts Name SpecificationsGKSB1.UKPLH-5Q'ty/setPLH-4 PLH-6Remarks(Drawing No.)WiringDiagramSymbolRecom-mendedQ'tyUnit AmountP

7815OPTIONAL PARTSNote 1. How to connect refrigerant pipes.Factory supplied optional refrigerant pipings contain refrigerant at the above atmospheric

79ORN 123BRNRED3. TIMER ADAPTERThis adapter is needed for system control and for operation via external contacts. Adapter connection is described on p

8Service Ref.Power supply(phase, cycle,voltage)External finishHeat exchangerBooster heaterOperation control & ThermostatNoise level(Low-High)Cond.

8012345BRNREDORNYLWGRNBACKACTIVEBYPASSPOWERON/OFFDUALCENTRALAHEADMITSUBISHI ELECTRICENGAGEDGROUPACTIVE BYPASSGROUPSELECTIONPROGRAMTIMERCONTROLLEROPERA

81ANET(Y)(W) (R) (O)(BR)5ALPOWERSUPPLYNFuse(5A)Tie-wrapWiring has to be changed when a 200,230 or 240V power is used.Tie-wrapTRANSFORMERTransmissionT

826. PROGRAM TIMER ADAPTERThis adapter is needed when a program timer(PAC-SK65PT)or a centralized remote controller(PAC-805RC)is used.6-2 Connection m

83Adaptor 200~240V AC3-core cable 5-core cable 52To program timer orcentralized remotecontrollerFig.3CN30 CN50 CN51Remote controller Indoor unitMax

HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO© Copyright 1997 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD.Issued in

9Service Ref.Power supply(phase, cycle,voltage)External finishHeat exchangerBooster heaterOperation control & ThermostatNoise level(Low-High)Cond.