Revision B: • MSZ-HC35VA- E2 and MSZ-HC35VABhave been added. E2 Please void OBH466 REVISED EDITION-A. SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL No. OBH466 REVISED EDITION-B Models MSZ-HC25VA MSZ-HC35VA MSZ-HC35VA MSZ-HC35VAB MSZ-HC35VAB - E1 E1 E2 E1 E2 Outdoor unit service manual MUZ-HC·VA Series (OBH467) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3.
Revision A: • 10. TROUBLESHOOTING has been corrected. • Color of lead wire (indoor fan motor : sensor part) of 10-5. ”Trouble criterion of main parts” has been corrected. • 10-6.” Check of indoor fan motor” has been corrected. [MSZ-HC25] Revision B: • MSZ-HC35VA- E2 and MSZ-HC35VAB- E2 have been added. Indoor coil thermistor (RT13) has been added.
1 TECHNICAL CHANGES MSZ-HA25VA MSZ-HA35VA MSZ-HA35VA - E1 E1 E1 → MSZ-HC25VA - E1 → MSZ-HC35VA - E1 → MSZ-HC35VAB - E1 1. Indoor fan motor has been changed. (DC AC) [MSZ-HC25] 2. Indoor heat exchanger has been changed. [MSZ-HC35] 3. Indoor electronic control P.C. board has been changed. MSZ-HC35VA - E1 → MSZ-HC35VA - E2 MSZ-HC35VAB - E1 → MSZ-HC35VAB - E2 1. Wiring diagram has been changed.
2 PART NAMES AND FUNCTIONS MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB Air inlet Front panel Air filter (Anti-mold) Air outlet Remote controller Vertical vane Horizontal vane Remote control receiving section Emergency operation switch (E.O.
3 SPECIFICATION Special remarks Indoor model MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB Function Cooling Heating Cooling Heating Cooling Heating Power supply Single phase, 230 V, 50 Hz A 0.22 Electrical Running current 1 data Power input 1 W 40 23 Model RC4V18-BA or CA RC0J40-ED Fan motor Current 1 A 0.22 Dimensions W × H × D mm 788×295×225 Weight kg 9 (Super High) 630 546 612 552 612 552 3 Air flow m /h (High/Med.
4 NOISE CRITERIA CURVES MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB FAN SPEED FUNCTION Super High SPL(dB(A)) COOLING 43 HEATING 43 FAN SPEED FUNCTION LINE Super High OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
5 OUTLINES AND DIMENSIONS MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB Unit : mm 225 11 × 20 Oblong hole 59 225 18.5 11 × 26 Oblong hole 59 Installation plate 155 335 Indoor unit 5 235 253.5 214 155 59 320 74 Wall hole ø65 Air in 225 2 41.5 40.5 254.5 215 788 Installation plate 42 53 Air out 50 WIRING DIAGRAM MSZ-HC25VA 7 Insulation Liquid line Gas line Drain hose Piping 42 42 58 6 128 Drain hose 119 137 18 140 57 607 42 57 100 8 58 295 Piping ø35 O.D ø6.35 - 0.
MSZ-HC35VA- E1 MSZ-HC35VAB- E1 MSZ-HC35VA- E2 MSZ-HC35VAB- E2 8
7 REFRIGERANT SYSTEM DIAGRAM MSZ-HC25VA MSZ-HC35VA- E1 MSZ-HC35VAB- E1 Unit : mm Refrigerant pipe ø9.52 (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12 Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating MSZ-HC35VA- E2 MSZ-HC35VAB- E2 Refrigerant pipe ø9.
8 SERVICE FUNCTIONS MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.) Set time : 1-minute → 1-second Set time : 3-minute → 3-second (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. P.C.
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. After the power is restored, the unit restarts automatically according to the memory.
9 MICROPROCESSOR CONTROL MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section ON/OFF (operate/stop) button Temperature buttons Fan speed control button 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. Indoor unit receives the signal of the remote controller with beeps.
9-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) 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. 1. Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.
9-4. 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 (approx. 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button. AUTO 1 2 3 4 SWING (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper.
(9) To change the airflow direction not to blow directly onto your body. When to use this function? Pressing and holding Use this function if VANE CONTROL button you don’t want the air for 2 seconds or more from the indoor unit to cause the horizontal vane blow directly onto your to reverse and move to body. horizontal position. • Depending on the shape of the room, the air may blow directly onto your body.
9-5. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) 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) → (ON TIMER) → TIMER RELEASE (3) Set the time of the timer using the button. Each time this button is pressed, the set time increase or decrease by 1 hour to 12 hours. 2.
10 TROUBLESHOOTING MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB 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.
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 doesn't recur. 1.
2. Indoor unit failure mode table Upper lamp of OPAbnormal point ERATION INDICA(Failure mode) TOR lamp Not lighted Normal Condition Correspondence — The room temperature thermistor short or 1-time flash every Room temperature open circuit is detected every 8 seconds dur0.5-second thermistor ing operation. Indoor coil 2-time flash The indoor coil thermistor short or open circuit 2.5-second OFF is detected every 8 seconds during operation.
10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates only in Test Run operation. Check room temperature thermistor. Refer to 10-7. "Test point diagram and voltage". Outdoor unit doesn't operate even in Test Run operation. Refer to "How to check inverter/compressor". Indoor unit operates. Outdoor unit doesn't operate normally. Unit doesn't operate normal operation in COOL or HEAT mode. Refer to "Check of R.V. coil".
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 Not lighted No.
10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB Part name Room temperature thermistor (RT11) Check method and criterion Measure the resistance with a tester. Figure Indoor fan motor (MF) MSZ-HC35 Measure the resistance between the terminals with a tester. (Part temperature 10 ~ 30°C) Normal RC4V18-BA RC4V18-CA 273 ~ 296 Ω 308 ~ 334 Ω 295 ~ 320 Ω 295 ~ 320 Ω Color of lead wire WHT - BLK BLK - RED MAIN AUX. FUSE Normal range 4.5 ~ 5.
MSZ-HC35VA MSZ-HC35VAB The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN211. Is there any foreign matter that interferes the rotation of the line flow fan? Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.
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 visible? Yes No (Not clear) Replace the batteries. (Refer to 10-1.4.) Remove the batteries, then set them back and press RESET button. (Refer to 10-1.4.) Check if the unit operates with the remote controller.
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 motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch? No Yes Measure the resistance of indoor fan motor. Refer to 10-5. Short circuit : Replace the indoor fan motor.
D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. No Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring. No Press EMERGENCY OPERATION switch once.
E Electromagnetic noise enters into TV sets or radios Is the unit earthed? Yes Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m? No Earth the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor power P.C. board, Indoor terminal P.C. board MSZ-HC25VA Indoor terminal P.C. board Fuse (F11)( ) Indoor power P.C. board Varistor (NR11) Resistor (R111) } Terminal block Connector to indoor electronic control P.C. board (CN20A) 5 VDC Indoor fan motor (CN211) 230V AC 12 VDC CN121 GND Please replace the fuse after removing the indoor terminal P.C. board from the electrical box. MSZ-HC35VA MSZ-HC35VAB Indoor terminal P.C.
2. Indoor electronic control P.C. board Timer short mode point JPG JPS (Refer to 8-1.) Room temperature thermistor RT11 (CN111) Indoor coil thermistor RT12, RT13 (CN112) Room temperature thermistor (RT11) Indoor coil thermistor (RT12, RT13) GND Resistance (kΩ) Vane motor (CN151) Connector to Indoor power P.C. board (CN10A) 12V DC Emergency operation switch (E.O. SW) (SW1) 11 5V DC Temperature (°C) Release of Auto restart function Solder the Jumper wire to JR07 (Refer to 8-3.
OPERATING PROCEDURE PHOTOS 2. Removing the indoor electronic control P.C. board and the room temperature thermistor Photo 2 (1) Turn the breaker OFF. (2) Remove the panel (refer to 1.) and the corner box. (3) Open the indoor electronic control P.C. board holder (to right side), and disconnect connectors of the indoor coil thermistor (CN112), vane motor (CN151), and connector (CN10A) to the indoor power P.C. board on the indoor electronic control P.C. board.
OPERATING PROCEDURE PHOTOS 4. Removing the vane motor Photo 4 (1) Turn the breaker OFF. (2) Remove the panel (refer to 1.) and the corner box. (3) Remove the indoor electronic control P.C. board holder (refer to 2.). (4) Remove the screws of vane motor and remove the vane motor. (5) Disconnect the connector from vane motor. Screws of the vane motor Photo 5 5. Removing the indoor fan motor, the indoor coil thermistor, and the line flow fan (1) Remove the panel (refer to 1.) and the corner box.
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Aug. 2008. No. OBH466 REVISED EDITION-B 6 Distributed in Feb. 2007. No. OBH466 REVISED EDITION-A 6 Distributed in Jan. 2007. No. OBH466 6 Made in Japan New publication, effective Aug. 2008 Specifications subject to change without notice.
