Mitsubishi Electric MFZ-KA50VA Service Manual

CONTENTS1. TECHNICAL CHANGES ··································· 22. PART NAMES AND FUNCTIONS ····················· 33. SPECIFICATION ················

106WIRING DIAGRAMGRNS112CN20212-24VTBS3REDBLKTO OUTDOORUNITCONNECTINGINDOOR ELECTRONIC CONTROL P.C. BOARDWHT230V~S2WHTCN20112LD10333CN112CN113111RT11R

11REFRIGERANT SYSTEM DIAGRAM7IndoorheatexchangerFlared connectionRoom temperaturethermistorRT11Indoor coil thermistorRT12, RT14,RT15 (main) RT13 (sub)

12Wet and dry bulbthermometersBACK VIEWOUTDOOR UNITFRONT VIEWWet and dry bulbthermometersINDOOR UNITPERFORMANCE CURVES8The standard specifications app

13Cooling capacity0.91.01.11.21.31.41.513.712.511.410.49.38.37.411.38.0-10-5 0 5 101520253035404546SUZ-KA50VAR2.THSUZ-KA50VA2.THRated frequency 76HzSU

14OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENTCorrection of Cooling capacityCapacity correction factorsThe operational frequency of compressorCorrect

15 Air flow: High speed Operational frequency : 57 Hz (SUZ-KA25VA(H).TH) 56.5 Hz (SUZ-KA25VA(H)R1.TH, KA25VA2.TH) 77 Hz (SUZ-KA35VA(H).TH) 75 H

16INDOOR INDOOR21OUTDOOR DB(°C)25 27 30WB(°C)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(°C)21 18 2.94 1.41 0.48 464 2.81 1.35

1735 40 46OUTDOOR DB(°C)INDOOR INDOORDB (°C) WB (°C)Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT21 18 2.45 1.18 0.48 568 2.25 1.08 0.48 603 2.08

18INDOOR INDOOR21OUTDOOR DB(°C)25 27 30WB(°C)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(°C)21 18 4.11 1.93 0.47 872 3.94 1.85

1935 40 46OUTDOOR DB(°C)INDOOR INDOORDB (°C) WB (°C)Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT21 18 3.43 1.61 0.47 1068 3.15 1.48 0.47 1134 2.

21TECHNICAL CHANGESMFZ-KA25VA-E1 MFZ-KA25VA-E2MFZ-KA35VA-E1 MFZ-KA35VA-E2MFZ-KA50VA-E1 MFZ-KA50VA-E21. Operation of thermo-off-unit has been

20INDOOR INDOOR21OUTDOOR DB(°C)25 27 30WB(°C)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(°C)21 18 5.64 2.54 0.45 1240 5.40 2.4

2135 40 46OUTDOOR DB(°C)INDOOR INDOORDB (°C) WB (°C)Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT21 18 4.70 2.12 0.45 1519 4.32 1.94 0.45 1612 3.

22INDOOR-10Q INPUT-5Q INPUT0Q INPUT5Q INPUT10Q INPUT15Q INPUT20Q INPUT1521262.142.041.845345856262.582.452.286516937353.032.892.697357688103.473.303.1

23SERVICE FUNCTIONS99-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic cont

2424NOTE: • The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller.• If main p

25INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect two or more indoor units with one o

26Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though OPERATION INDICATOR lamp indicat

272. Indoor unit failure mode tableNOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (10-4.). 12-time flash2.5

28StartIndoor unit operates.Outdoor unit does notoperate.Indoor unit doesnot receive the signal from remote controller.OPERATION INDICATORlamp on the

29NOTE: When the indoor unit has started operation and the above failures are detected (the first detection after the power ON), the ind

32PART NAMES AND FUNCTIONSINDOOR UNITMFZ-KA25VAMFZ-KA35VAMFZ-KA50VAVertical vaneAir outletHorizontal vaneCatechin air filterDisplay and operation sect

30OPERATION INDICATORNot lightedBlinkingLightedNOTE: When the indoor unit has started operation and the above failures are detected (the first detecti

31 -1. Check of indoor fan motor (upper)AWhen the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR

32 -2. Check of indoor fan motor (lower)AWhen the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR

33Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller, dis

34The unit cannot be operated with the remote controller.Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.

35 How to check miswiring and serial signal errorWhen the left lamp of OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.Outdoor un

36 Check of damperWhen the left lamp of OPERATION INDICATOR lamp flashes 15-time. Indoor unit and outdoor unit do not operate.JR06JR05Turn OFF th

37 Electromagnetic noise enters into TV sets or radiosNoNoNoYesYesNoNoYesYesYesIs the distance between theantennas and the indoorunit within 3 m,

38Indoor coil thermistor [RT12,RT14,RT15 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11)Temperature (°C)Resistance (kΩ)MFZ-KA25VA MFZ-KA35VA

39DISASSEMBLY INSTRUCTIONS11(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking

44ACCESSORIESREMOTE CONTROLLERDrain hoseRemote controller holderFixing screw for 3.5 x 16 mm (Black)Pipe coverBandBattery (AAA) for remote control

402. Removing the electronic control P.C. board and the display and receiver P.C. board(1) Remove the panel. (Refer to 1.)(2) Remove the screw of the

41OPERATING PROCEDURE PHOTOSPhoto 74. Removing the horizontal vane motor unit(1) Remove the panel. (Refer to 1.)(2) Remove the screws of the horizonta

42OPERATING PROCEDURE PHOTOSPhoto 11Photo 13Photo 10Photo 12Screws of the damper lock motor (Right)Lead wires of the damper motor and the damper lock

43PARTS LIST (non-RoHS compliant)12MFZ-KA25VAMFZ-KA35VAMFZ-KA50VA12-1. INDOOR UNIT STRUCTURAL PARTSNo.Part No.Part nameRemarksSymbolin WiringDiagramQ&

44MFZ-KA25VAMFZ-KA35VAMFZ-KA50VA12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS123456714 1512 191618242123 228912131011172526201815PARTS LIST

45NOZZLE ASSEMBLY (UPPER)HORIZONTAL VANE (BACK)HORIZONTAL VANE (FRONT)VANE SLEEVEBEARING ASSEMBLYNOZZLE ASSEMBLY (LOWER)DAMPER MOTORVANE MOTOR SUPPORT

46MFZ-KA25VAMFZ-KA35VA MFZ-KA50VA12-4. INDOOR UNIT HEAT EXCHANGER52341HAIR PIN COVERINDOOR HEAT EXCHANGERUNION (LIQ) UNION (GAS) WATER COVERINDOOR COI

4713-1. INDOOR UNIT STRUCTURAL PARTSNo.RoHSPart No. Part nameSymbolin WiringDiagramQ'ty/unitRemarksMFZ-25VA- 35VA- 50VA-E1 E2 E3 E4 E5 E1 E2 E3 E

48MFZ-KA25VAMFZ-KA35VAMFZ-KA50VA13-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS12345671415 12 191618242123 228912131011172526201815RoHS PARTS

4913-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTSPart numbers that are circled are not shown in the illustration.No.RoHSPart No. Part nameSymb

53SPECIFICATIONIndoor model MFZ-KA25VA MFZ-KA35VA MFZ-KA50VAFunction Cooling Heating Cooling Heating Cooling HeatingPower supplySingle phase230 V, 50

50MFZ-KA25VAMFZ-KA35VAMFZ-KA50VA13-4. INDOOR UNIT HEAT EXCHANGER5234167RoHS PARTS LIST (RoHS compliant)13-4. INDOOR UNIT HEAT EXCHANGERNo.RoHSPart No

5151OPTIONAL PARTS14ModelPart No.MAC-415FT-EMFZ-KA25VA-MFZ-KA25VA-MFZ-KA25VA-MFZ-KA25VA-MFZ-KA25VA-MFZ-KA35VA-MFZ-KA35VA-MFZ-KA35VA-MFZ-KA35VA-MFZ-KA3

Copyright 2005 MITSUBISHI ELECTRIC CORPORATIONDistributed in Nov. 2012. No. OB409 REVISED EDITION-EDistributed in May 2009. No. OB409 REVISED EDITIO

6Outdoor modelSUZ-KA25VA(H).THSUZ-KA25VA(H)R1.THSUZ-KA25VA2.THIndoor modelMFZ-KA25VASUZ-KA35VA(H).THSUZ-KA35VA(H)R1.THSUZ-KA35VA2.THIndoor modelMFZ-KA

7T3.15AL 250 V12 V 250 Ω12 V 250 Ω12 V 250 Ω or 12 V 300 Ω12 V 300 ΩERZV14D471ItemModelFuseDamper lock motor RightDamper lock motor LeftHorizontal van

84NOISE CRITERIA CURVES90807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20NC-70OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.000

9Wireless remote controller162195860121960125147454155603545110806072337 33736333321059371311314- 6 HoleIndoor unitInstallation plate961231256019126