Instruction/ maintenance manual of the product MSZ-HJ25VA Mitsubishi
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CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. P ART NAMES AND FUNCTIONS ····················· 4 3. SPECIFICA TION ················································ 5 4.
2 <Preparation before the repair service> Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stopping the operation of the air conditioner , turn off the power-supply breaker and remove the power plug. Discharge the capacitor before the work involving the electric parts.
3 1 TECHNICAL CHANGES MSZ-HJ25V A - E1 MSZ-HJ35V A - E1 MSZ-HJ50V A - E1 1. New model OBH647A.
4 Operation indicator lamp Remote control receiving section Emergency operation switch Horizontal vane Air inlet Air fi lter Front panel Air outlet Heat exchanger Emergency operation switch Remote co.
5 3 SPECIFICA TION Indoor model MSZ-HJ25V A MSZ-HJ35V A MSZ-HJ50V A Power supply Single phase 230 V , 50 Hz Breaker Capacity A 10 12 Electrical data Power input 1 (T otal) Cooling W 730 1,040 2,050 Heating 870 995 1,480 Running current 1 (T otal) Cooling A 3.
6 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCT A VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR BAND CENTER FREQUENCIES, Hz COOLING FUNCTION SPL(dB(A)) LINE Super High F AN SPEED HEA TING 43 43 NC-10 MSZ-HJ25V A INDOOR UNIT WA L L MICROPHONE 0.
7 MSZ-HJ25V A MSZ-HJ35V A MSZ-HJ50V A Unit : mm MSZ-HJ25V A MSZ-HJ35V A MSZ-HJ50V A 5 OUTLINES AND DIMENSIONS 6 WIRING DIAGRAM 232 5 69 41 799 785 7 290 120 630 49 57 80 42 43 69 57 42 7 103 130 100 (57°) 225 225 80.5 80.5 61.5 59.5 340 338 41 42 249 248 21.
8 MSZ-HJ25V A MSZ-HJ35V A Indoor heat exchanger Flared connection Room temperature thermistor RT1 1 Flared connection Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe ø9.
9 8-2. P .C. BOARD MODIFICA TION FOR INDIVIDUAL OPERA TION A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller , P .C. boards of remote controller must be modified according to the number of the indoor unit.
10 NOTE: • The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller . • If main power is turned OFF or a power failure occurs while AUTO ST ART/ST OP timer is active, the timer setting is cancelled.
11 NOT E : Last setting will be stored after the unit is turned OFF with the remote controller . Indoor unit receives the signal of the remote controller with beeps.
12 9-2. DR Y ( ) OPERA TION (1) Press OPERA TE/STOP (ON/OFF) button. OPERA TION INDICA TOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERA TION SELECT button. (3) The set temperature is determined from the initial room temperature.
13 (5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) When OPERA TE/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 .
14 EMERGENCY OPERA TION switch 9-6. EMERGENCY/TEST OPERA TION In case of test run operation or emergency operation, use EMERGENCY OPERA TION 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.
15 3. T roubleshooting procedure 1) Check if the OPERA TION INDICA TOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality . T o make sure, check how many times the OPERA TION INDICA TOR lamp is flashing ON and OFF before starting service work.
16 10-2. F AILURE 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.
17 2. Indoor unit failure mode table Upper lamp of OP- ERA TION INDICA- TOR lamp Abnormal point (Failure mode) Condition Remedy Not lighted Normal — — 1-time fl ash every 0.5-second Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds dur- ing operation.
18 10-3. INSTRUCTION OF TROUBLESHOOTING Indoor unit oper- ates. Outdoor unit does not operate. If blinking of OPERA TION INDI- CA TOR lamp cannot be checked, it can be checked with failure mode recall function. Indoor unit operates. Outdoor unit does not operate normally .
19 10-4. TROUBLESHOOTING CHECK T ABLE 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 OPERA TION INDICA TOR lamp flashes.
20 10-5. TROUBLE CRITERION OF MAIN P ARTS MSZ-HJ25V A MSZ-HJ35V A MSZ-HJ50V A Part name Check method and criterion Figure Room temperature thermistor (RT1 1) Measure the resistance with a tester . Refer to 10-7. "T est point diagram and voltage", "2.
21 10-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. T urn OFF the power supply . Is there any foreign matter that interferes the rotation of the line fl ow fan? Ye s No Remove the foreign matter and adjust the line fl ow fan.
22 B Check of remote controller and indoor electronic control P .C. board Check if the remote controller is exclusive for this air conditioner . Does the unit operate with the remote controller? OK Ye s No (Not clear) Replace the batteries. (Refer to 10-1.
23 C Check of indoor P .C. board and indoor fan motor T urn OFF the power supply . Remove indoor fan motor connector CN21 1 from indoor power P .C. board and vane motor connector CN151 from the indoor electronic control P .C. board and turn ON the power supply .
24 D How to check miswiring and serial signal error A Reinstall ei- ther the unit or the light away from each other . Attach a fi lter on remote control receiving section of the indoor unit. • • T urn OFF inverter-controlled lighting equipment. T urn OFF the power supply and then turn ON again.
25 E Electromagnetic noise enters into TV sets or radios Ye s Is the unit earthed? No Earth the unit. Ye s Is the distance between the antennas and the indoor unit within 3 m, or is the distance betwe.
26 Room temperature thermistor (RT1 1) Indoor coil thermistor (RT12, RT13) T emperature (°C) Resistance (k Ω ) Fuse (F1 1) T3.15AL250V V aristor (NR1 1) Connector to indoor electronic control P .
OPERA TING PROCEDURE PHOTOS 1. Removing the panel (1) Remove the screw caps on the panel and remove the screws of the panel. (2) Pull the panel slightly toward you, and then remove the panel by pushing it upward. 27 MSZ-HJ25V A MSZ-HJ35V A MSZ-HJ50V A NOTE: Turn OFF power supply before disassembly .
OPERA TING PROCEDURE PHOTOS 2. Removing the indoor power P .C. board and the 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> CN151 (V ane motor) CN1 12 (Indoor coil thermistor) CN10A (T o the indoor power P .
OPERA TING PROCEDURE PHOTOS 3. Removing the indoor electronic control P .C. board (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Disconnect the following connectors: <Indoor electronic control P .C. board> CN151 (V ane motor) CN1 12 (Indoor coil thermistor) CN10A (T o the indoor power P .
OPERA TING PROCEDURE PHOTOS 5. Removing the indoor fan motor , the indoor coil 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 .
31 Fixing the indoor coil thermisor There are 2 forms of parts for fixing the indoor coil thermistor . NOTE: T ake care to avoid loss and accidental falling of the clip-shape part inside the unit. Mount the clip-shape part on the marked position. Do not pull the lead wire when removing the indoor coil thermistor .
© Copyright 2012 MITSUBISHI ELECTRIC CORPORA TION Distributed in Mar . 2013. No. OBH647 REVISED EDITION-A Distributed in Dec. 2012. No. OBH647 Made in Japan New publication, effective Mar . 2013 Specifications are subject to change without notice. HEAD OFFICE: TOKYO BLDG.
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