Table of Contents
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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-AY25VG
MSZ-AY35VG
MSZ-AY42VG
MSZ-AY50VG
MSZ-AY25VGK
MSZ-AY35VGK
MSZ-AY42VGK
MSZ-AY50VGK
MSZ-AY25VGKP
MSZ-AY35VGKP
MSZ-AY42VGKP
MSZ-AY50VGKP
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Outdoor unit service manual
MUZ-AY∙VG/VGH Series (OBH931)
MXZ-F∙VF/VFH Series (OBH790)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES ··························6
5. OUTLINES AND DIMENSIONS ·····················7
6. WIRING DIAGRAM ·····································8
7. REFRIGERANT SYSTEM DIAGRAM ··········· 13
8. SERVICE FUNCTIONS ······························ 14
9. MICROPROCESSOR CONTROL ················· 20
10. TROUBLESHOOTING ······························· 30
11. DISASSEMBLY INSTRUCTIONS ················· 45
PARTS CATALOG (OBB932)
No. OBH932
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSZ-AY25VG-ET1
Summary of Contents for Mitsubishi Electric MSZ-AY25VG-ET1
- Page 1 INDOOR UNIT No. OBH932 SERVICE MANUAL Models MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP Outdoor unit service manual MSZ-AY50VGKP MUZ-AY∙VG/VGH Series (OBH931) MXZ-F∙VF/VFH Series (OBH790) CONTENTS 1. TECHNICAL CHANGES ······························3 2. PART NAMES AND FUNCTIONS ··················4 3.
- Page 2 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.
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Page 3: Technical Changes
TECHNICAL CHANGES These models are compatible with the outdoor units with low standby power control. Connecting these models to the MUZ-AY·VG/VGH series outdoor units enables the low standby power control. These models may be connected to the MUZ-AY·VG/VGH series after once connected to the MXZ series and operated, for example because of relocation. -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP Air purifying device (VGKP type only) Front panel Air inlet Wi-Fi interface (VGK and VGKP only) Air fi lter Air cleaning fi lter (V Blocking Filter) (VG and VGK only) Emergency operation switch Spec name plate *1... -
Page 5: Specification
SPECIFICATION MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG Indoor model MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP Single phase 230 V, 50 Hz Power supply Cooling Power Heating input *1 Cooling 0.18 0.24 Running Heating current *1 0.26 0.32 Model RC0J30CV Cooling 0.18 0.24 Current *1... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-AY25VG MSZ-AY35VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY25VGKP MSZ-AY35VGKP 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 1000 2000 4000 8000... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP Insulation ø37 O.D Liquid line ø6.35 - 0.39m (Flared connection ø6.35) Gas line ø9.52 - 0.34m (Flared connection ø9.52) Drain hose Insulation ø29 Connected part ø16 O.D Insulation ø37 O.D Liquid line... -
Page 8: Wiring Diagram
WIRING DIAGRAM MSZ-AY25VG - MSZ-AY35VG - MSZ-AY42VG - MSZ-AY50VG - OBH932... - Page 9 MSZ-AY25VGK - MSZ-AY35VGK - MSZ-AY42VGK - MSZ-AY50VGK - OBH932...
- Page 10 MSZ-AY25VGK - MSZ-AY35VGK - MSZ-AY42VGK - MSZ-AY50VGK - OBH932...
- Page 11 MSZ-AY25VGKP - MSZ-AY35VGKP - MSZ-AY42VGKP - MSZ-AY50VGKP - OBH932...
- Page 12 MSZ-AY25VGKP - MSZ-AY35VGKP - MSZ-AY42VGKP - MSZ-AY50VGKP - OBH932...
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Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MSZ-AY25VG MSZ-AY35VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY25VGKP MSZ-AY35VGKP 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) Refrigerant flow in cooling Refrigerant flow in heating... -
Page 14: Service Functions
SERVICE FUNCTIONS MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP 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.) •... - Page 15 8-4. Wi-Fi INTERFACE SETTING UP 3-1. Setting up in WPS-PUSH mode This Wi-Fi interface, communicates the status information and controls the commands from the MELCloud by connecting to the WPS-Push mode To enter the mode indoor unit. Front panel (1) Hold down the Temperature 5 seconds.
- Page 16 3-2. Setting up in Access Point mode 3-2.3. Register the information of the router on the air conditioner. Complete the setting up in the Access Point mode within 10 minutes. In the displayed window, select Dynamic in Access Point mode DHCP (*1) and enter the information of router, To enter the mode then tap the Submit button.
- Page 17 • This Wi-Fi interface should not be installed and the router does not exceed the limit. connected to any Mitsubishi Electric system which is • Make sure that DHCP is enabled, or check IP to provide application critical cooling or heating.
- Page 18 8-5. CHANGING THE CORRECTION VALUE OF THE ROOM TEMPERATURE (THE INLET TEMPERATURE) The correction value of the room temperature can be adjusted in the range of 2 to 5 °C with the remote controller. Normally, the temperature at the room temperature sensor might become higher than that around feet because warm air tends to accumulate around an indoor unit during heating operation.
- Page 19 2. Writing the correction value of the room temperature on the wiring diagram After setting the correction value of the room temperature (the inlet air temperature), follow 11. DISASSEMBLY INSTRUCTIONS to disassemble the indoor unit, and then write the correction value (any of 3, 4, or 5) on the wiring dia- gram with a ballpoint pen, etc.
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Page 20: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP WIRELESS REMOTE CONTROLLER MSZ-AY25VG - MSZ-AY25VGK - MSZ-AY25VGKP - MSZ-AY35VG - MSZ-AY35VGK - MSZ-AY35VGKP - MSZ-AY42VG - MSZ-AY42VGK - MSZ-AY42VGKP - MSZ-AY50VG - MSZ-AY50VGK - MSZ-AY50VGKP - Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from... -
Page 21: Cool Operation
INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. • The following indication applies regardless of shape of the indication. Indication Operation state Room temperature The unit is operating to reach the set About 2°C or more away from set temperature temperature (VG, VGK only) Blinking... -
Page 22: Heat Operation
9-4. HEAT ( ) OPERATION (1) Press OFF/ON (stop/operate) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select HEAT mode with Operation select button. (3) Press Temperature buttonsTEMP button to select the desired temperature. The setting range is 10 - 31°C. 1. -
Page 23: Auto Vane Operation
9-6. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. 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 Up-down airflow control button. -
Page 24: Timer Operation
2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing Left-right airflow control button. (SWING) (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper. -
Page 25: Weekly Timer Operation
9-8. 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 •... - Page 26 (4) Press button to complete and transmit the weekly timer setting. which was blinking 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.
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Page 27: I-Save Operation
9-10. i-save ( ) OPERATION 1. How to set i-save operation (1) Press OFF/ON (stop/operate) button. (2) Select COOL, HEAT or ECONO COOL mode. (3) Press i-save button. (4) Set the temperature, fan speed, and airflow direction for i-save operation. NOTE: •... -
Page 28: Emergency/Test Operation
9-14. EMERGENCY/TEST OPERATION In the case of test run operation or the emergency operation, use the emergency operation switch on the right side of the indoor unit. The emergency operation is available when the remote controller is missing or has failed, or the batteries in the remote controller are running down. -
Page 29: Troubleshooting
TROUBLESHOOTING MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP 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 30 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 31 2. Flow chart of AIR PURIFYING power failure mode recall function (MSZ-AY•VGKP) Operational procedure The air purifying device might be abnormal. Check if the air purifying device is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. With the remote controller headed towards the indoor unit, press TEMP *1.
- Page 32 4. 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 of Abnormal point OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit Normal —...
- Page 33 10-3. INSTRUCTION OF TROUBLESHOOTING 1. Check of the unit. *1 “Test Run operation” means the *2 There is possibility that diesel explosion may occur due to the air mixed in operation within 30 minutes after the refrigerant circuit. First, ensure that there are no leakage points on the valves, flare connec- the emergency operation switch tions, etc.
- Page 34 2. Check of Wi-Fi interface Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Did the LED indication blink 10 times after you There is a problem in a communication between the air con- selected the setting of the Wi-Fi interface and the ditioner and the Wi-Fi interface.
- Page 35 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 blinks. OPERATION INDICATOR Blinking Not lit...
- Page 36 OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Upper lamp lights and lower lamp blinks. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY) and •...
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Page 37: 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 the emergency operation switch. - Page 38 B Check of remote controller and indoor electronic control P.C. board *Check if the remote controller is exclusive for this air conditioner. Press OFF/ON (stop/operate) button on *1 Look at the image of the signal transmitting section of the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
- Page 39 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 between CN211 and the vane motor connector Short circuit: CN151 from the indoor electronic control CN211 of the indoor fan motor Replace the indoor fan motor.
- Page 40 D How to check miswiring and serial signal error MUZ Type Turn the main power supply 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 in...
- Page 41 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 Lit: abnormal communication or not connected Turn ON the power supply.
- Page 42 E Check of AIR PURIFYING power After performing the check, make sure to release the failure mode recall function. High voltage (approximately 5.8kV) is generated during AIR PURIFYING power operation. Turn ON the power supply. Pay careful attention and never touch the air purifying device and the high-voltage lead part.
- Page 43 F 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 out- distance between the antennas and the door unit.
- Page 44 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor terminal P.C. board, Indoor electronic control P.C. board, Receiver P.C. board, Display P.C. board, Switch/buzzer P.C. board MSZ-AY25VG MSZ-AY35VG MSZ-AY42VG MSZ-AY50VG MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP Terminal P.C.Board To disable “Auto restart function” cut the Jumper wire to JR77.
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Page 45: Operating Procedure
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 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 46 PHOTOS/FIGURES OPERATING PROCEDURE Removing the panel (R) (Photos 1, 2, Figure 1) to 2 (1) Remove the front panel and the horizontal vanes (U) Screw of the Screws of the (L). Panel (F) panel (L) panel (R) (2) Remove the screw cap on the panel (R), and the screw.
- Page 47 PHOTOS/FIGURES OPERATING PROCEDURE 2. Removing the Wi-Fi interface (Photos 3, 5) Photo 3 (1) Remove the front panel and the horizontal vanes (U) Wi-Fi interface (L). Screw of the (2) Remove the panels (R) (L) (U). electrical cover (3) Remove the screw of the V.A. clamp and remove the V.A.
- Page 48 PHOTOS/FIGURES OPERATING PROCEDURE 3. Removing the indoor electrical box and the air Photo 4 purifying device (Photos 3, 4, 5, 6) Lead wire of the indoor coil thermistor (1) Remove the front panel and the horizontal vanes (U) and air purifying device (MSZ-AY·VGKP) (L).
- Page 49 PHOTOS/FIGURES OPERATING PROCEDURE 5. Removing the nozzle assembly Photo 7 (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 50 PHOTOS/FIGURES OPERATING PROCEDURE 7. Removing the line flow fan, the indoor fan motor Photo 10 assembly, the indoor coil thermistor (Photo 10, Heat exchanger 11, 12) (1) Remove the front panel, the horizontal vanes (U) (L), the panels (R) (L) (F) (U), the Wi-Fi interface, the elec- trical box, and the nozzle assembly.
- Page 51 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 52 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2022 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2022. No. OBH932 Made in Japan Specifications are subject to change without notice.
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