Mitsubishi Electric MSZ-FH25VE - E1 Service Manual

Split-type air conditioners

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Service manual (42 pages)

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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

MSZ-FH25VE

MSZ-FH35VE

MSZ-FH50VE

NOTE:

RoHS compliant products have mark on the spec name plate.

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVE ································ 6

5. OUTLINES AND DIMENSIONS ························ 7

6. WIRING DIAGRAM ············································ 8

7. REFRIGERANT SYSTEM DIAGRAM ··············· 9

8. SERVICE FUNCTIONS ··································· 10

9. MICROPROCESSOR CONTROL ··················· 12

10. TROUBLESHOOTING ····································· 20

11. DISASSEMBLY INSTRUCTIONS ···················· 36

PARTS CATALOG (OBB623)

Revision A:>

• MSZ-FH50VE-

has been added.

Please void OBH623.

No. OBH623

REVISED EDITION-A

Outdoor unit service manual

MUZ-FH·VEHZ Series (OBH625)

MUZ-FH·VE Series

MUZ-FH·VE Series (OBH624)

MXZ-D·VA Series

MXZ-D·VA Series (OBH626)

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi Electric MSZ-FH25VE - E1

Page 1: Table Of Contents
Revision A: • MSZ-FH50VE- has been added. Please void OBH623. SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT No. OBH623 SERVICE MANUAL REVISED EDITION-A Models MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE Outdoor unit service manual Outdoor unit service manual MUZ-FH·VEHZ Series (OBH625) MUZ-FH·VEHZ Series (OBH625) MUZ-FH·VE Series MUZ-FH·VE Series (OBH624) MXZ-D·VA Series MXZ-D·VA Series (OBH626)
Page 2: Revision A
Use the speciﬁ ed 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: Technical Changes
TECHNICAL CHANGES MSZ-FH25VE - MSZ-FH35VE - MSZ-FH50VE - 1. New model These models are compatible with the outdoor units with low standby power control. Connecting these models to the MUZ-FH·VE(HZ)-series outdoor units enables the low standby power control. Refer to the technical guide (OBT17) about the low standby power control.
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE Front panel Air purifying device Air inlet Emergency operation switch Air ﬁlter Air cleaning ﬁlter (Electrostatic anti-allergy enzyme ﬁlter and deodorizing ﬁlter) Horizontal i-see SENSOR vane Air outlet Remote controller (AIR PURIFYING) Remote control receiving (POWER) section Operation indicator lamp...
Page 5: Specification
SPECIFICATION Indoor model MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.28 0.29 Running current Heating 0.28 0.29 Model RC0J30-MD Cooling 0.28 0.29 Current Heating 0.28 0.29 Dimensions W × H × D 925 ×...
Page 6: Noise Criteria Curve
NOISE CRITERIA CURVE MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE 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...
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE Unit: mm MSZ-FH25VE MSZ-FH35VE Insulation ø37 O.D Liquid line ø6.35 - 0.39 m (Flared connection ø6.35) Gas line ø9.52 - 0.34 m (Flared connection ø9.52) Drain hose Insulation ø28 O.D Connected part ø16 O.D MSZ-FH50VE Insulation ø37 O.D...
Page 8: Wiring Diagram
WIRING DIAGRAM MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE OBH623A...
Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-FH25VE MSZ-FH35VE Unit: mm 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 MSZ-FH50VE...
Page 10: Service Functions
SERVICE FUNCTIONS MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE 8-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit-of JPG and JPS.) 8-2.
Page 11 8-4. 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.
Page 12: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE 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 WIDE VANE button Operation display section VANE CONTROL button...
Page 13: High
9-2. 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 mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature. 1.
Page 14 NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit. • When you try to operate two or more indoor units with one 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 (7) SWING ( ) mode By selecting SWING mode with VANE CONTROL button, the horizontal vanes swing vertically. When COOL, DRY or FAN mode is selected, only the upper vane swings. (8) Cold air prevention in HEAT operation The horizontal vane position is set to Upward. NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control does not work in the indoor unit.
Page 16 9-7. 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 17 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 18 (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 19: Med
9-11. NATURAL FLOW ( ) OPERATION In NATURAL FLOW operation, air ﬂ ow will become more like natural wind. An occupant will not be directly exposed to the air ﬂ ow and feel more comfortable. (1) Press NATURAL FLOW button during COOL or FAN mode to start NATURAL FLOW operation. (2) Press NATURAL FLOW button again to cancel NATURAL FLOW operation.
Page 20: Troubleshooting
TROUBLESHOOTING MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE 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 then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
Page 21: 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 22: Indoor Unit
2. Flow chart of AIR PURIFYING power failure mode recall function Operational procedure The air purifying device might be abnormal. Confirm if the air purifying device is abnormal according to the following procedures. Make sure that the remote controller is in the failure mode recall function.
Page 23: Indoor Unit
4. Indoor unit failure mode table Abnormal point POWER lamp Condition Remedy (Failure mode) Not lighted Normal — — The room temperature thermistor short or 1-time ﬂ ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor thermistor (10-7.).
Page 24: Indoor Unit
10-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means the If blinking of OPERATION INDI- operation within 30 minutes af- CATOR lamp cannot be checked, Start ter EMERGENCY OPERATION it can be checked with failure switch is pressed. mode recall function. Indoor unit operates.
Page 25: 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. •...
Page 26: Indoor Unit
OPERATION INDICATOR Lighted Blinking Not lighted (POWER) (AIR PURIFYING) Abnormal Operation indicator lamp Symptom Condition Remedy point • AIR PURIFYING lamp ﬂ ash. The operation mode of the each indoor unit is Outdoor unit MXZ type differently set to COOL (includes DRY, FAN) •...
Page 27: 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 28 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) button on the remote controller. 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera.
Page 29 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
Page 30: Indoor Unit
D How to check miswiring and serial signal error MUZ-25/35 Turn the 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...
Page 31: Indoor Unit
MUZ-FH50 Turn the power supply OFF. NOTE: Refer to the outdoor unit service manual. 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 •...
Page 32: Indoor Unit
MXZ Type Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the indoor POWER lamp light up?
Page 33: High
When AIR PURIFYING lamp flashes 2-time. When POWER lamp flashes 1 to 5 times while AIR PURIFYING power failure mode is recalled. 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 Turn ON the power supply.
Page 34: Indoor Unit
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 distance between the antennas and the outdoor unit.
Page 35 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-FH25VE MSZ-FH35VE MSZ-FH50VE Indoor power P.C. board Connector Terminal Varistor (NR11) Indoor fan motor Fuse (F11) Block (CN201) (CN211) (+)0 or 15 VDC (+)3-6 VDC 15 VDC...
Page 36: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (Refer to (1) and (2)) 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 37 OPERATING PROCEDURE PHOTOS 2. Remove the indoor electrical box Photo 3 Earth wire (1) Remove the panels (Refer to 1.) and the corner box Electrical box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire.
Page 38 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 7 (1) Remove the panels (Refer to 1.) and the corner box Screw of the vertical right. vane motor unit (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to 2.). (4) Disconnect the following connector:
Page 39 OPERATING PROCEDURE PHOTOS 7. Removing the air purifying device Photo 9 Lead wire of the indoor (1) Remove the panels (Refer to 1.) and the corner box coil thermistor right. Water cut (2) Remove the air purifying device. (3) Remove the electrical box (Refer to 2.). (4) Remove the lead wire from the water cut.
Page 40 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2013. No. OBH623 REVISED EDITION-A New publication, effective Mar. 2013 Distributed in Jul. 2012. No. OBH623 Specifications are subject to change without notice.

This manual is also suitable for:

Msz-fh35ve - e1 Msz-fh50ve - e1 Msz-fh25ve Msz-fh35ve Msz-fh50ve