Mitsubishi Electric MFZ-KJ25VE Service Manual

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

1010CN123CN105CN104CN111CN211T111C111L101CN201 F11JR77NOTE:• The operation settings are memorized when 10 seconds have passed after the indoor unit wa

11WIRELESS REMOTE CONTROLLERMFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VEMICROPROCESSOR CONTROL9NOTE: Last setting will be stored after the unit is turned OFF wi

129-2. DRY ( ) OPERATION(1) Press OPERATE/STOP (ON/OFF) button.OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.(2) Select DRY mo

139-6. AUTO VANE OPERATION1. Horizontal vane (Horizontal vane/Multi-flow vane)(1) Vane motor driveThese models are equipped with a stepping motors for

14(8) SWING () modeBy selecting SWING mode with VANE CONTROL button, the horizontal vanes swing vertically. The remote controller displays " &q

159-8. WEEKLY TIMER OPERATION• A maximum of 4 ON or OFF timers can be set for individual days of the week.• A maximum of 28 ON or OFF timers can be se

16(5) Press button to turn the weekly timer ON. ( lights.)•When the weekly timer is ON, the day of the week whose timer setting is complete, will l

179-10. EMERGENCY/TEST OPERATIONIn the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indo

18TROUBLESHOOTING10MFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VENOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly. 2. Th

19Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though OPERATION INDICATOR lamp indicat

21TECHNICAL CHANGESMFZ-KJ25VE -A1MFZ-KJ35VE -A1MFZ-KJ50VE -A11. New model· The model MFZ-KJ25VE-A1 or MFZ-KJ35VE-A1 is connectable with the MUFZ-KJ·VE

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

21StartIndoor unit operates.Outdoor unit does notoperate.Indoor unit doesnot receive the signal from remote controller.OPERATION INDICATORlamp on the

2210-4. TROUBLESHOOTING CHECK TABLEOPERATION INDICATORNot lightedBlinkingLightedBefore taking measures, make sure that the symptom reappears for accur

2310-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTSMFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VEREDYLWBRNORNGRNROTORPart name FigureCheck method and criteriaIndoor

2410-6. TROUBLESHOOTING FLOW A Check of indoor fan motorThe indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30

25 Check of remote controller, display receiver P.C. board and indoor control P.C. boardB Check if the remote controller is exclusive for this

26 Check of indoor electronic control P.C. board and indoor fan motorCCN211Fuse (F11)VARISTOR (NR11)Indoor electroniccontrol P.C. BoardCN151R111

27 How to check miswiring and serial signal errorD• Turn OFF inverter-controlled lighting equipment.• Turn OFF the power supply and then turn it

28MUFZ-KJ50Turn the power supply OFF.Is there rated voltage in the power supply?YesNoCheck for incorrect indoor-outdoor connecting wiring.Check the po

29• Turn OFF inverter-controlled lighting equipment.• Turn OFF the power supply and then turn ON again.• Press EMERGENCY OPERATION switch.AIs serial s

32PART NAMES AND FUNCTIONSMFZ-KJ25VEMFZ-KJ35VEMFZ-KJ50VEE.OSWDisplay and operation section (When the front panel is opened)Operation indicator lampEme

30LED1 LED2LED indication for communication statusCommunication status is indicated by the LED.Unit status NoBlinking: normal communicationLighted: ab

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

32Indoor coil thermistor [RT12,RT14,RT15 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11)Temperature (°C)Resistance (kΩ)MFZ-KJ25VE MFZ-KJ35VE

11-1. MFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VE NOTE: Turn OFF power supply before disassembly.OPERATING PROCEDURE PHOTOS1. Removing the panel(1) Push down t

OPERATING PROCEDURE PHOTOS3. Removing the electronic control P.C. board and the display receiver P.C. board(1) Remove the panel. (Refer to 1.)(2) Remo

35Vane shaftsOpeningHow to remove the multi-flow vane and the horizontal vanesHorizontal vane (back)Horizontal vane (front)Unit body Unit bodyVane sh

OPERATING PROCEDURE PHOTOS5. Removing the horizontal vane motor(1) Remove the panel. (Refer to 1.)(2) Remove the screws of the horizontal vane motor s

OPERATING PROCEDURE PHOTOS7. Removing the line flow fan and the indoor fan motor(1) Remove the panel. (Refer to 1.)(2) Remove the electrical box. (Ref

Copyright 2014 MITSUBISHI ELECTRIC CORPORATIONDistributed in Apr. 2014. No. OBH697Made in JapanHEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-

43SPECIFICATIONIndoor model MFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VEPower supply Single phase 230 V, 50 HzElectrical dataPower input 1CoolingW13 21Heating 1

54NOISE CRITERIA CURVESNC-60NC-50NC-40NC-30NC-20NC-70NC-60NC-50NC-40NC-30NC-20NC-708070605040302010063 125 250 500 1000 2000 4000 8000OCTAVE BAND SOUN

6OUTLINES AND DIMENSIONS5Unit: mmMFZ-KJ25VEMFZ-KJ35VEMFZ-KJ50VEOBH697

76WIRING DIAGRAMMFZ-KJ25VEMFZ-KJ35VEMFZ-KJ50VEOBH697

8REFRIGERANT SYSTEM DIAGRAM7IndoorheatexchangerFlared connectionRoom temperaturethermistorRT11Indoor coil thermistorRT14, RT15 (main) RT13 (sub)Flared

9SERVICE FUNCTIONS88-1. TIMER SHORT MODE• For service, the following set time can be shortened by bridging the timer short mode point on the electroni