Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MSZ-HJ25VA
MSZ-HJ35VA
MSZ-HJ50VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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E1
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E1
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E1
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 ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. SERVICE FUNCTIONS ····································· 9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING ····································· 15
11. DISASSEMBLY INSTRUCTIONS ···················· 27
PARTS CATALOG (OBB647)
• MSZ-HJ50VA-
has been added.
E1
Please void OBH647.
No. OBH647
REVISED EDITION-A
Outdoor unit service manual
MUZ-HJ·VA Series (OBH648)
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSZ-HJ25VA-E1
Summary of Contents for Mitsubishi Electric MSZ-HJ25VA-E1
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Page 1: Table Of Contents
Revision A: • MSZ-HJ50VA- has been added. SPLIT-TYPE AIR CONDITIONERS Please void OBH647. INDOOR UNIT No. OBH647 SERVICE MANUAL REVISED EDITION-A Models MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Outdoor unit service manual MUZ-HJ·VA Series (OBH648) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3. -
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-HJ25VA - MSZ-HJ35VA - MSZ-HJ50VA - 1. New model OBH647A... -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Front panel Air inlet Air filter Horizontal vane Air outlet Emergency Heat exchanger operation switch Remote control Remote controller receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Installation plate fi xing screw 4 × 25 mm Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) -
Page 5: Specification
SPECIFICATION Indoor model MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Power supply Single phase 230 V, 50 Hz Breaker Capacity Cooling 1,040 2,050 Power input 1 (Total) Heating 1,480 Cooling Running current 1 (Total) Heating Cooling Power factor 1 (Total) Heating Starting current 1 (Total) Model RC0J40-EF Cooling... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-HJ25VA MSZ-HJ35VA 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... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Unit : mm 11×26 Oblong hole 11×20 Oblong hole Installation plate 80.5 80.5 Indoor unit 61.5 59.5 Wall hole Φ Air in Installation plate Piping 20 or more 40 or more Drain hose Air out MSZ-HJ25/35VA Insulation Φ35 O.D... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-HJ25VA MSZ-HJ35VA Unit : mm Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Indoor coil thermistor RT13 Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating MSZ-HJ50VA Refrigerant pipe ø12.7... -
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA 8-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuiting the timer short mode point on the electronic control P.C. board. (Refer to 10-7.) Set time : 3-minute → 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuiting the timer short mode point.) 8-2. - Page 10 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. Operation If the main power has been cut, the operation settings remain.
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Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section ON/OFF (operate/stop) button Fan speed control button Temperature buttons ECONO COOL button Vane control button Operation select button Timer mode select button Time set buttons RESET button NOTE : Last setting will be stored after the unit is turned OFF with the remote controller. - Page 12 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.
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Page 13: Heating
(5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When ON TIMER is ON standby. (6) Dew prevention During COOL or DRY operation with the vane angle at Angle 3 ~ 5 when the compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 2 for dew prevention. - Page 14 9-6. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.
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Page 15: Troubleshooting
TROUBLESHOOTING MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA 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 16: 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. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur. -
Page 17: Indoor Unit
2. Indoor unit failure mode table Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp 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... -
Page 18: Indoor Unit
10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit does Indoor unit oper- OPERATION INDICATOR Outdoor unit does not receive ates. lamp on the indoor unit is not operate normally. Outdoor unit the signal from fl ashing on and off. remote controller. -
Page 19: 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 Lighted Blinking... - Page 20 10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 10-7. "Test point diagram and voltage", "2. Indoor electronic control Indoor coil thermistor P.C.
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Page 21: 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 22 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. 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 23 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.
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Page 24: Indoor Unit
D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? 1. Turn ON the power supply. 2. Press the emergency operation switch. Has the relay 52C been turned on 3 minuets later ? [The relay will be turned on in 3 to 7 seconds by short circuiting the timer short mode point (Refer to 10-7.).] Initializing the determination of the power... -
Page 25: 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 26 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor power P.C. board MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Connector to Fuse (F11) Terminal block T3.15AL250V Varistor (NR11) Resistor (R111) (CN201) Connector to Indoor fan motor (CN211) (+)0 or 15 VDC (+)3-6 VDC 15 VDC (-) GND (High voltage DC) 325 VDC...
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Page 27: 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 28 OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the Photo 2 Earth wire electrical box (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Disconnect the following connectors: <Indoor electronic control P.C. board> Screw of the CN151 (Vane motor) electrical cover...
- Page 29 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. Photo 4 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to 1.) Remove the right corner Catch box. (2) Disconnect the following connectors: Indoor electronic <Indoor electronic control P.C. board> control P.C.
- Page 30 OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil Photo 6 thermistor and the line flow fan (1) Remove the panel. (Refer to 1.) Remove the right cor- ner box. (2) Remove the control P.C. board holder, the electrical box and the nozzle assembly.
- Page 31 Fixing the indoor coil thermisor There are 2 forms of parts for fixing the indoor coil thermistor. Clip shape Holder shape Position and procedure for mounting the clip-shape part 1. Set the indoor coil 2. Check the (marked) 3.Mount the thermistor in the center mounting position.
- Page 32 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2013. No. OBH647 REVISED EDITION-A Distributed in Dec. 2012. No. OBH647 New publication, effective Mar. 2013 Made in Japan Specifications are subject to change without notice.