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Mitsubishi Electric MSZ-AP25VG Service Manual

Split-type air conditioner
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SERVICE MANUAL

Models
MSZ-AP25VG
MSZ-AP35VG
MSZ-AP42VG
MSZ-AP50VG
MSZ-AP25VGK
MSZ-AP35VGK
MSZ-AP42VGK
MSZ-AP50VGK
NOTE:
RoHS compliant products have mark on the spec name plate.
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Outdoor unit service manual
MUZ-AP·VG(H) Series (OBH789)
MXZ-D·VA(H) Series (OBH626)
MXZ-E·VA(H) Series (OBH723)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 9
8. SERVICE FUNCTIONS ··································· 10
9. MICROPROCESSOR CONTROL ··················· 12
10. TROUBLESHOOTING ····································· 19
11. DISASSEMBLY INSTRUCTIONS ···················· 33
PARTS CATALOG (OBB788)
No. OBH788

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  Summary of Contents for Mitsubishi Electric MSZ-AP25VG

  • Page 1: Table Of Contents

    INDOOR UNIT No. OBH788 SERVICE MANUAL Models MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK Outdoor unit service manual MUZ-AP·VG(H) Series (OBH789) MXZ-D·VA(H) Series (OBH626) MXZ-E·VA(H) Series (OBH723) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3.
  • Page 2: Technical Changes

    These models may be connected to the MUZ-AP·VG(H) series after once connected to the MXZ series and operated, for example because of relocation. In that case, the MUZ-AP·VG(H) series outdoor units will not operate without taking a step. Follow the procedure "Deleting the memorized abnormal condition" described in 10-2.1. MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG...
  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK Front panel Air inlet Wi-Fi interface MSZ-AP·VGK Air lter (Air purifying lter) Air cleaning lter (Silver-ionized air puri er lter, option) Emergency Horizontal vane operation switch Spec name plate...
  • Page 4: Specification

    SPECIFICATION MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG Indoor model MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.18 0.24 Running current Heating 0.26 0.32 Model RC0J30CV Cooling 0.18 0.24 Current 1 Heating 0.26 0.32...
  • Page 5: Noise Criteria Curves

    NOISE CRITERIA CURVES MSZ-AP25VG MSZ-AP35VG MSZ-AP25VGK MSZ-AP35VGK 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...
  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG Unit: mm MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK INSTALLATION PLATE 11×20 OBLONG HOLE 11×26 OBLONG HOLE WALL HOLE 65 INDOOR UNIT INSTALLATION PLATE AIR IN PIPING DRAIN HOSE MIN 20mm MIN 40mm AIR OUT (MSZ-AP25/35/42/50VG(K)- Insulation ø37 O.D...
  • Page 7: Wiring Diagram

    WIRING DIAGRAM MSZ-AP25VG- MSZ-AP35VG- MSZ-AP42VG- MSZ-AP50VG- OBH788...
  • Page 8 MSZ-AP25VGK- MSZ-AP35VGK- MSZ-AP42VGK- MSZ-AP50VGK- OBH788...
  • Page 9: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-AP25VG MSZ-AP35VG Unit: mm MSZ-AP25VGK MSZ-AP35VGK Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator)
  • Page 10: Service Functions

    SERVICE FUNCTIONS MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK 8-1. 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 10-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute.
  • Page 11: Cooling

    Electric’s MELCloud Wi-Fi service. Third party Wi-Fi interfaces cannot be connected to MELCloud. Mitsubishi Electric is not responsible for any (i) under performance of a sys- (1) MODE switch tem or any product; (ii) system or product fault; or (iii) loss or damage to any system or product;...
  • Page 12: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK 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...
  • Page 13 9-2. 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 14: Heating

    NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect 2 or more indoor units with 1 outdoor unit. • When you try to operate 2 or more indoor units with 1 outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected.
  • Page 15 (9) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher by the microprocessor. (However, the temperature on the LCD screen on the remote controller is not changed.) Also the horizontal vane swings in various cycle.
  • Page 16 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
  • Page 17 (3) Press , and buttons to set ON/OFF, time, and temperature. E.g. : [ON], [6:00] and [24°C] are selected. Pressing selects ON/OFF timer. Pressing Pressing adjusts the time. adjusts the tem- Pressing perature. deletes timer setting. * Hold down the button to change the time quickly. * The temperature can be set between 16°C and 31°C at cool operation.
  • Page 18 9-10. i-save ( ) OPERATION 1. How to set i-save operation (1) Press STOP/OPERATE (OFF/ON) button. (2) Select COOL, HEAT or ECONO COOL mode. (3) Press i-save button. (4) Set the temperature, fan speed, and airfl ow direction for i-save operation. NOTE: •...
  • Page 19: Troubleshooting

    TROUBLESHOOTING MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK 10-1. 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 after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 20: Indoor Unit

    10-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 21: Indoor Unit

    2. Table of indoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.). The upper lamp Abnormal point of OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lighted Normal —...
  • Page 22: Indoor Unit

    10-3. INSTRUCTION OF TROUBLESHOOTING 1. Check of the unit. Start NOTE: The indoor unit does not operate by smartphone, refer to 10-3.2."Check of Wi-Fi Interface". Indoor unit operates. Indoor unit does Indoor unit oper- OPERATION INDICATOR Outdoor unit does ates. not receive the lamp on the indoor unit is not operate normally.
  • Page 23 2. Check of Wi-Fi interface (MSZ-AP·VGK) Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Start There is a problem in communication between the air conditioner and Is the UNIT lamp on the Wi-Fi interface blinking? the Wi-Fi interface.
  • Page 24: Indoor Unit

    10-4. 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 flashes. OPERATION INDICATOR Blinking Not lit...
  • Page 25: Indoor Unit

    OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Upper lamp lights and lower lamp fl ashes. The operation mode of the each indoor unit MXZ type Outdoor unit is differently set to COOL (includes DRY) and •...
  • Page 26: Troubleshooting Flow

    10-6. 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 CN211. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
  • Page 27 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) button 1 Look at the image of the signal transmitting section of on the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
  • Page 28 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove the indoor fan motor connector Measure the resistance of indoor fan CN211 and the vane motor connector Short circuit: motor. CN151 from the indoor electronic control Replace the indoor fan motor.
  • Page 29: Indoor Unit

    D How to check miswiring and serial signal error Turn the main power supply MUZ Type OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored...
  • Page 30: Indoor Unit

    MXZ Type Turn OFF the power supply. LED indication for communication status Communication status is indicated Is there rated voltage in by the LED. Check the power the power supply? supply. Unit status Blinking: normal communication Lighting: abnormal communication or not connected Turn ON the power supply.
  • Page 31: Indoor Unit

    E 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 32 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor power P.C. board, Indoor electronic control P.C. board, Receiver board, Display board, Switch board MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK Terminal P.C.Board To disable "Auto restart function" cut the Jumper wire to JR77.
  • Page 33: Disassembly Instructions

    Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK NOTE: Turn OFF the power supply before disassembly. Photos: MSZ-AP42VGK OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 34 OPERATING PROCEDURE PHOTOS/FIGURES Removing the panel (R) (Photos 1, 2, Figure 1) to 2 (1) Remove the front panel and the horizontal vanes (U) (L). Screw of the Screws of the Panel (F) (2) Remove the screw cap on the panel (R), and the panel (L) panel (R) screw.
  • Page 35 OPERATING PROCEDURE PHOTOS/FIGURES Wi-Fi 2. Removing the Wi-Fi interface (Photos 3, 5) Photo 3 interface MSZ-AP · Screw of the (1) Remove the front panel and the horizontal vanes (U) electrical cover (L). (2) Remove the panels (R) (L) (U). Catch of the (3) Remove the Wi-Fi interface on the right side of the water cover...
  • Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electrical box Photo 4 (Photos 3, 4, 5) Earth wire connected to Lead wire of indoor the indoor heat exchanger (1) Remove the front panel and the horizontal vanes (U) coil thermistor (L). (2) Remove the panels (R) (L) (U) (F).
  • Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the nozzle assembly Photo 6 (1) Remove the front panel and the horizontal vanes (U) (L). (2) Remove the panels (R) (L) (U) (F). (3) Remove the indoor/outdoor connecting wire (Refer to section 3). (4) Remove the electrical cover (Refer to section 3). (5) Disconnect the following connector: <Indoor electronic control P.C.
  • Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the line flow fan, the indoor fan motor Photo 9 assembly, the indoor coil thermistor (Photo 9, 10, 11) Heat exchanger (1) Remove the front panel, the horizontal vanes (U) (L), the panels (R) (L) (F) (U), the Wi-Fi interface (MSZ- AP·VGK), the electrical box, and the nozzle assem- bly.
  • Page 39 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
  • Page 40 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2017. No. OBH788 Made in Japan Specifications are subject to change without notice.