Mitsubishi Electric MSZ-HR25VFK Service Manual

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Operating instructions manual (153 pages)

Service manual (60 pages)

Installation manual (10 pages)

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INDOOR UNIT

SERVICE MANUAL

Models

MSZ-HR25VF

MSZ-HR35VF

MSZ-HR42VF

MSZ-HR50VF

MSZ-HR25VFK

MSZ-HR35VFK

MSZ-HR42VFK

MSZ-HR50VFK

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 ················ 13

10. TROUBLESHOOTING ······························· 17

11. DISASSEMBLY INSTRUCTIONS ················· 32

PARTS CATALOG (OBB844)

Revision B:

•MSZ-HR25/35/42/50VF -

HR25/35/42/50VFK -

have been added.

OBH844 REVISED EDITION-A is void.

No. OBH844

REVISED EDITION-B

Outdoor unit service manual

MUZ-HR∙VF Series (OBH823)

MXZ-HA∙VF Series (OBH828)

and MSZ-

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Summary of Contents for Mitsubishi Electric MSZ-HR25VFK

Page 1: Table Of Contents
MSZ- HR25/35/42/50VFK - have been added. OBH844 REVISED EDITION-A is void. INDOOR UNIT No. OBH844 REVISED EDITION-B SERVICE MANUAL Models MSZ-HR25VF MSZ-HR25VFK MSZ-HR35VF MSZ-HR35VFK MSZ-HR42VF MSZ-HR42VFK MSZ-HR50VF MSZ-HR50VFK Outdoor unit service manual MUZ-HR∙VF Series (OBH823) MXZ-HA∙VF Series (OBH828) CONTENTS 1.
Page 2: Technical Changes
MSZ-HR42VF - MSZ-HR42VF - MSZ-HR50VF - MSZ-HR50VF - 1. Air cleaning filter has been changed. 2. Panel assembly has been changed. 3. Electronic control P.C. board has been changed. MSZ-HR25VFK - MSZ-HR35VFK - MSZ-HR42VFK - MSZ-HR50VFK - 1. New model OBH844B...
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK Wi-Fi interface Heat exchanger Front panel (Only for MSZ-HR∙VFK) Air inlet Air ﬁlter Air cleaning ﬁlter (Silver-ionized air purifier filter, option) (Only for MSZ-HR∙VF - Horizontal vane Air cleaning ﬁlter...
Page 4: Specification
Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature - Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C *1 Measured under rated operating frequency. Specifications and rated conditions of main electric parts MSZ-HR25VF MSZ-HR25VFK MSZ-HR35VF MSZ-HR35VFK Model MSZ-HR42VF MSZ-HR42VFK MSZ-HR50VF MSZ-HR50VFK Fuse (F11) T3.15AL250V...
Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-HR25VF MSZ-HR35VF MSZ-HR25VFK MSZ-HR35VFK FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING 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 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF Unit: mm MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK OBH844B...
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-HR25VF - MSZ-HR35VF - MSZ-HR42VF - MSZ-HR50VF - MSZ-HR25VF - MSZ-HR35VF - MSZ-HR42VF - MSZ-HR50VF - OBH844B...
Page 8 MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK OBH844B...
Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MSZ-HR25VF MSZ-HR25VFK MSZ-HR35VF MSZ-HR35VFK Refrigerant pipe ø9.52 Refrigerant pipe ø9.52 (with heat insulator) (with heat insulator) Indoor coil Indoor coil Indoor Indoor thermistor thermistor heat heat RT12 RT12 exchanger exchanger Flared connection Flared connection Indoor coil...
Page 10: Service Functions
MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK 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 8-3. 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.
Page 12 Wi-Fi service. • This Wi-Fi interface should not be installed and connected to Wi-Fi interface any Mitsubishi Electric system which is to provide applica- tion critical cooling or heating. • At the time of relocation or disposal, reset the Wi-Fi interface Wi-Fi interface introduction to the factory default.
Page 13: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OFF/ON (stop/operate) button FAN speed control button Temperature buttons ECONO COOL button Operation select button VANE control button TIMER mode select button...
Page 14 9-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with Operation select button. (3) Press Temperature buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 - 31°C.
Page 15 9-5. MULTI SYSTEM OPERATION 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 trying 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 16 9-7. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer (1) Press OFF/ON (stop/operate) button to start the air conditioner. (2) Select the timer mode by pressing the button during operation. Each time this button is pressed, the timer mode is changed in sequence: (OFF TIMER) →...
Page 17: Troubleshooting
TROUBLESHOOTING MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK 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 18 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 19 2. Table of indoor unit failure mode recall function Left lamp of Abnormal point OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit Normal — — Room The room temperature thermistor short or 1-time blink every Refer to the characteristics of the room temperature temperature open circuit is detected every 8 seconds dur- 0.5-second...
Page 20 10-3. INSTRUCTION OF TROUBLESHOOTING *1 "Test Run operation" means the *2 There is possibility that diesel explosion may occur due to the air mixed in 1. Check of the unit the refrigerant circuit. operation within 30 minutes after First, ensure that there are no leakage points on the valves, flare connec- the emergency operation switch tions, etc.
Page 21 2. Check of Wi-Fi interface (MSZ-HR·VFK) 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 LED on the Wi-Fi interface blinking? the Wi-Fi interface.
Page 22 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 23 OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and right lamp blinks. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY, FAN) •...
Page 24 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 25 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 the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 10-1.4.) visible? (Not clear) Remove the batteries, then set them back...
Page 26 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance of indoor fan Short circuit: and vane motor connector CN151 from the motor. Replace the indoor fan motor. indoor electronic control P.C.
Page 27 D How to check miswiring and serial signal error MUZ Type NOTE: Refer to the outdoor unit service manual. 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.
Page 28 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 29 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 30 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board, indoor terminal P.C. board and power monitor receiver SW P.C. board MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF Indoor electronic control P.C. board Connector to Indoor coil thermistor (CN112) RT12, RT13 Connector to Indoor Indoor terminal P.C.
Page 31 MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK Indoor electronic control P.C. board Connector to Indoor coil thermistor (CN112) RT12, RT13 Connector to Indoor Indoor terminal P.C. board Vane motor(CN151) fan motor (CN211) Resistor (R111) Varistor (NR11) Fuse (F11) T3.15AL250V Power monitor receiver SW P.C. board...
Page 32: 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 33 PHOTOS/FIGURES OPERATING PROCEDURE 2. Removing the indoor terminal P.C. board, indoor Photo 2 Tab of the electronic control P.C. board, power monitor earth wire Water cover Wires of indoor receiver SW P.C. board and the electrical box <Removing the electrical box> coil thermistor (1) Remove the panel.
Page 34 PHOTOS/FIGURES OPERATING PROCEDURE 3. Removing the nozzle assembly and the vane Photo 5 motor <Removing the nozzle assembly> (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the V.A. clamp and the indoor/outdoor connect- ing wire. (3) Remove the electrical cover.
Page 35 PHOTOS/FIGURES OPERATING PROCEDURE 4. Removing the indoor fan motor, the indoor coil Photo 7 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2,3.) (3) Remove the screws fixing the motor bed.
Page 36 11-2. MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK NOTE: Turn OFF the power supply before disassembly. PHOTOS/FIGURES OPERATING PROCEDURE 1. Removing the panel Photo 1-1 (1) Remove the front panel. Wi-Fi interface (2) Remove the screw caps of the panel. Remove the Screw of Front panel screws of the panel.
Page 37 PHOTOS/FIGURES OPERATING PROCEDURE 2. Removing the Wi-Fi interface Photo 2 Earth wire connected to the indoor heat (1) Remove the panel (Refer to section 1.) and the corner exchanger box right. Electrical box Wi-Fi interface (2) Remove the screw of the V.A. clamp. Remove the V.A.
Page 38 PHOTOS/FIGURES OPERATING PROCEDURE 4. Removing the indoor terminal P.C. board, indoor Photo 4 Tab of the electronic control P.C. board and power monitor earth wire Water cover Wires of indoor receiver SW P.C. board coil thermistor (1) Remove the panel (Refer to section 1.) and the corner box right.
Page 39 PHOTOS/FIGURES OPERATING PROCEDURE 5. Removing the nozzle assembly and the vane Photo 6 motor <Removing the nozzle assembly> (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the V.A. clamp and the indoor/outdoor connect- ing wire. (3) Remove the electrical cover.
Page 40 PHOTOS/FIGURES OPERATING PROCEDURE 6. Removing the indoor fan motor, the indoor coil Photo 8 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2,3.) (3) Remove the screws fixing the motor bed.
Page 41 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 42 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2021. No. OBH844 REVISED EDITION-B Issued: Nov. 2020. No. OBH844 REVISED EDITION-A Published: Aug. 2019. No. OBH844 Made in Japan Specifications are subject to change without notice.

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Mitsubishi Electric MSZ-HR25VFK Service Manual

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