Table of Contents
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SERVICE MANUAL
Models
MFZ-KT25VG
MFZ-KT35VG
MFZ-KT50VG
MFZ-KT60VG
MFZ-KT25VG
MFZ-KT35VG
MFZ-KT50VG
MFZ-KT60VG
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E1
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CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. SAFETY PRECAUTION ···································· 3
3. PART NAMES AND FUNCTIONS ···················· 7
4. SPECIFICATION ··············································· 8
5. NOISE CRITERIA CURVES ······························ 9
6. OUTLINES AND DIMENSIONS ·······················11
7. WIRING DIAGRAM ·········································· 12
8. REFRIGERANT SYSTEM DIAGRAM ············· 13
9. SERVICE FUNCTIONS ··································· 15
10. MICROPROCESSOR CONTROL ···················· 17
11. TROUBLESHOOTING ····································· 25
12. DISASSEMBLY INSTRUCTIONS ··················· 37
PARTS CATALOG (OBB843)
No. OBH843
Outdoor unit service manual
SUZ-M•VA Series (OCH684)
MXZ- F •VF Series (OBH790)
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Table of Contents
Related Manuals for Mitsubishi Electric SUZ-M-VA Series
Summary of Contents for Mitsubishi Electric SUZ-M-VA Series
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Page 1: Table Of Contents
INDOOR UNIT No. OBH843 SERVICE MANUAL Models MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Outdoor unit service manual SUZ-M•VA Series (OCH684) MXZ- F •VF Series (OBH790) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. SAFETY PRECAUTION ···································· 3 3. PART NAMES AND FUNCTIONS ···················· 7 4. -
Page 2: Technical Changes
Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. -
Page 3: Safety Precaution
SAFETY PRECAUTION 2-1. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R32/R410A WARNING 1. Warning for service (1) In case of reconnecting the refrigerant pipes after detaching, make the flared part of pipe re-fabricated. (2) This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual. Refer to outdoor unit installation manual. - Page 4 (1-8) Checks on the Refrigeration Equipment Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer’s technical department for assistance.
- Page 5 (7) Removal and Evacuation When breaking into the refrigerant circuit to make repairs – or for any other purpose conventional procedures shall be used. However, for flammable refrigerants it is important that best practice is followed since flammability is a considera- tion.
- Page 6 (10) Labelling Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stat- ing the equipment contains flammable refrigerant. (11) Recovery When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely.
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Page 7: Part Names And Functions
PART NAMES AND FUNCTIONS MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Horizontal vane Air outlet Multi-flow vane Vertical vane Fan guard Air cleaning filter Panel Front panel Air filter Display and operation section (When the front panel is opened) Emergency operation switch Remote control receiving section Operation indicator lamp ACCESSORIES Model... -
Page 8: Specification
SPECIFICATION Indoor model MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.17 0.34 0.55 Running current Heating 0.20 0.45 0.49 Model RC0J30-Q# RC0J40-P# Cooling 0.14 0.32 0.52 Current Heating 0.17 0.43 0.46 Dimensions W ×... -
Page 9: Noise Criteria Curves
NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C Outdoor Dry-bulb temperature 35°C Heating: Indoor Dry-bulb temperature 20°C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C 1 Measured under rated operating frequency. Specifications and rating conditions of main electric parts Model MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Item... - Page 10 MFZ-KT50VG MFZ-KT60VG FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
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Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Unit: mm OBH843... -
Page 12: Wiring Diagram
WIRING DIAGRAM MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG OBH843... -
Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MFZ-KT25VG MFZ-KT35VG Flared connection Indoor coil Refrigerant pipe 9.52 Indoor thermistor heat (with heat insulator) RT12 (main) exchanger Distributor Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Refrigerant pipe 6.35 (with heat insulator) Refrigerant flow in cooling Flared connection Refrigerant flow in heating MFZ-KT50VG... - Page 14 Unit: mm MFZ-KT60VG Flared connection 12.7) ( 15.88) Indoor coil Refrigerant pipe 15.88 Indoor thermistor heat (with heat insulator) RT12 (main) Joint pipe exchanger Distributor 12.7) Indoor coil thermistor RT14, RT15 (main) RT13 (sub) Room temperature thermistor RT11 Refrigerant pipe 6.35 (with heat insulator) Flared connection...
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Page 15: Service Functions
SERVICE FUNCTIONS MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG 9-1. TIMER SHORT MODE • For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C. board. (Refer to 11-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute. •... -
Page 16: Indoor Unit
9-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power. Operation If the main power has been cut, the operation settings remain. -
Page 17: Microprocessor Control
MICROPROCESSOR CONTROL MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from the indoor unit when the signal is received. FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button Operation display section VANE CONTROL button i-save button... -
Page 18: Indoor Unit
10-2. DRY ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature. 1. - Page 19 10-6. AUTO VANE OPERATION 1. Horizontal vane (Horizontal vane/Multi-flow vane) (1) Vane motor drive These models are equipped with a stepping motors for the horizontal vanes. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL ( ) button.
- Page 20 (5) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem- perature distribution. In COOL, DRY and FAN operation In HEAT operation 2 FLOW: Vane angle is fixed to position 2. 2 FLOW: Vane angle is fixed to position 2.
- Page 21 10-7. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK button. How to set the current time (a) Press the CLOCK button.
- Page 22 10-8. 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 set for a week. NOTE: • The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the weekly timer;...
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Page 23: Indoor Unit
(4) Press button to complete and transmit the weekly timer setting. which was blink- ing goes out, and the current time will be displayed. NOTE: • Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the indoor unit for 3 seconds. -
Page 24: Indoor Unit
10-10. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use Operation mode COOL/HEAT EMERGENCY OPERATION switch on the right side of the indoor unit. Set temperature 24°C Emergency operation is available when the remote controller is miss- Fan speed Medium ing or has failed, or when the batteries in the remote controller are... -
Page 25: Troubleshooting
TROUBLESHOOTING MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker. -
Page 26: Indoor Unit
11-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check table (11-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur. -
Page 27: Indoor Unit
2. Table of indoor unit failure mode recall function NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (10-4.). Left lamp of Right lamp of Abnormal point OPERATION OPERATION Condition Remedy (Failure mode) INDICATOR lamp INDICATOR lamp Not lit Not lit... -
Page 28: Indoor Unit
11-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit does Indoor unit operates. OPERATION INDICATOR operates. not receive Outdoor unit does lamp on the indoor unit is Outdoor unit the signal from not operate normally. blinking ON and OFF. does not remote controller. -
Page 29: Indoor Unit
11-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks. OPERATION INDICATOR Blinking Not lit... -
Page 30: Indoor Unit
OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Right lamp blink When the operation mode of the each indoor Outdoor unit MXZ type • Select the same operation mode unit is differently set to COOL (includes DRY) operates but Operation for all the units. - Page 31 11-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
- Page 32 Check of remote controller, display receiver P.C. board and indoor control P.C. board Check if the remote controller is exclusive for this air conditioner. 1 Look at the image of the signal transmitting section of Press STOP/OPERATE (OFF/ON) the remote controller through the monitor of a digital button on the remote controller.
- Page 33 Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance of indoor fan and vane motor connector CN151 from the Short circuit: motor. indoor electronic control P.C. board and turn Replace the indoor fan motor.
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Page 34: Indoor Unit
How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage of Check the power 230 V AC in the power supply. supply? Turn ON the power supply. Is there 230 V AC between outdoor terminal block S1 and Check the wiring. -
Page 35: Indoor Unit
Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit. - Page 36 11-7. TEST POINT DIAGRAM AND VOLTAGE MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG Indoor electronic control P.C. board FUSE (F11) T3.15AL250V Varistor (NR11) Serial signal input (CN202) JR05 Modification JR06 point for Power supply (CN201) individual input 230 V AC operation (Refer to 9-2.) To disable "Auto Resistor restart function",...
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Page 37: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are following 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electronic control P.C. board and Photo 4 the display receiver P.C. board (1) Remove the panel. (Refer to section 1.) Earth wire connect to (2) Remove the electrical box. (Refer to section 2.) the heat exchanger (3) Remove the earth wire connected to the electronic control P.C.
- Page 39 How to remove the multi-flow Horizontal vane (back) vane and the horizontal vanes Horizontal vane (front) Unit body (1) Removing the horizontal vane (front/back) (1)-1. See the figure below and push to open the indicated Multi-flow vane places on the horizontal vanes (between front and back) with your fingers so that you can access 4 vane shafts positioned on the back of the horizontal vanes.
- Page 40 OPERATING PROCEDURE PHOTOS/FIGURES Photo 9 5. Removing the horizontal vane motor (1) Remove the panel. (Refer to section 1.) Screws of the nozzle (2) Remove the screws of the horizontal vane motor sup- port and pull out the horizontal vane motor support from the nozzle.
- Page 41 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the line flow fan and the indoor fan Photo 13 Screw of the line flow fan motor (1) Remove the panel. (Refer to section 1.) (2) Remove the electrical box. (Refer to section 2.) (3) Remove the nozzle. (Refer to section 4.) (4) Disengage the water cover from the catches.
- Page 42 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the R32 sensor Photo 18 (1) Remove the panel. (Refer to section 1.) (2) Loosen the screw of the R32 sensor plate, and take the R32 sensor plate. (3) Cut the band fixing the lead wire. (4) Disengage the R32 sensor cover from the R32 sensor plate.
- Page 43 OBH843...
- Page 44 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Published: Jun. 2019. No. OBH843 Made in Japan Specifications are subject to change without notice.
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