SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT No. OBH600 SERVICE MANUAL Models MSZ-SF25VE MSZ-SF42VE MSZ-SF25VE MSZ-SF42VE - E1 E1 EN1 EN1 MSZ-SF35VE MSZ-SF50VE MSZ-SF35VE MSZ-SF50VE - E1 E1 EN1 EN1 Outdoor unit service manual MXZ-C·VA Series (OB584) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. NOISE CRITERIA CURVES ······························ 5 5.
Use the specified 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. Prepare the proper tools.
2 PART NAMES AND FUNCTIONS MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE Front panel Air filter (Nano platinum filter) Air inlet Air cleaning filter (Electrostatic anti-allergy enzyme filter, option) Emergency operation switch Horizontal vane Heat exchanger Air outlet Remote control receiving section Operation indicator lamp Remote controller ACCESSORIES Model MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE Installation plate Installation plate fixing screw 4 × 25 mm Remote controller holder Fixin
3 SPECIFICATION Fan motor Electrical data Indoor model Power supply Cooling Power input 1 Heating Running current 1 Model Cooling Heating Cooling Heating Dimensions W × H × D Weight Air direction Super High High Med. Low Silent Super High High Med. Low Silent Super High High Med. Low Silent Super High High Med. Low Silent Super High High Med. Low Silent Super High High Med. Low Silent Fan speed regulator Remote controller model 1 W A A 0.
4 NOISE CRITERIA CURVES MSZ-SF35VE MSZ-SF25VE FAN SPEED FUNCTION Super High SPL(dB(A)) COOLING 42 HEATING 45 LINE FAN SPEED FUNCTION Super High 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 NC-20 NC-10 10 63 125 250 500 1000 2000 4000 8000 46 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 NC-20 NC-10 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MSZ-SF50VE MSZ-SF42VE FAN SPEED FUNCTION Super High SPL(dB(A)) COOLING 42 HEATING 47
5 OUTLINES AND DIMENSIONS MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE Unit: mm 11×26 Oblong hole 11×20 Oblong hole Indoor unit 162.5 331.5 67.5 309.5 89.5 Wall hole Φ65 Installation plate Piping 299 577 160 47 ( 80 ) 60 92 18 Air out 193 45 45 108.5 71 Piping (MSZ-SF25/35/42/50VEInsulation Liquid line Gas line Drain hose Piping E1 58 ) Φ37 O.D Φ6.35 - 0.39m (Flared connection Φ6.35) Φ9.52 - 0.34m [Flared connection Φ9.52 (MSZ-SF25/35/42VE), Φ12.
6 WIRING DIAGRAM MSZ-SF25VE MSZ-SF42VE MSZ-SF35VE MSZ-SF50VE OBH600 7
7 REFRIGERANT SYSTEM DIAGRAM MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE Refrigerant pipe ø9.52 (MSZ-SF25/35/42VE) ø12.7 (MSZ-SF50VE) (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12 (main) Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.
8 SERVICE FUNCTIONS MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE 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 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. 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-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE WIRELESS REMOTE CONTROLLER Signal transmitting section FAN SPEED CONTROL button OPERATION SELECT button Operation display section VANE CONTROL button ECONO COOL button TIME, TIMER set buttons FORWARD button BACKWARD button i save button Temperature buttons WEEKLY TIMER set button OPERATE/STOP (ON/OFF) button RESET button CLOCK SET button Indication of remote controller model is on back NOTE: Last setting will be stored afte
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. Coil frost prevention Coil frost prevention is as same as COOL mode. (9-1.1.) 2. Low outside temperature operation Low outside temperature operation is as same as COOL mode. (9-1.2.) 3.
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. Other indoor units cannot operate, and operation indicator lamp flashes as shown in the figure below.
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 SET button. How to set the current time (a) Press the CLOCK set button. (b) Press the TIME SET buttons ( and ) to set the current time.
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 weekly timer; the weekly timer operation will start again after the simple ON/OFF timer is complete. 1. How to set the weekly timer * Make sure that the current time and day are set correctly.
(5) Press button to turn the weekly timer ON. ( lights.) •When the weekly timer is ON, the day of the week whose timer setting is complete, will light. Press button again to turn the weekly timer OFF. ( goes out.) NOTE: The saved settings will not be cleared when the weekly timer is turned OFF. 2. Checking weekly timer setting (1) Press button to enter the weekly timer setting mode. blinks. * (2) Press or buttons to view the setting of the particular day or number.
10 TROUBLESHOOTING MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE 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. 1. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
2. Indoor unit failure mode table The left lamp of Abnormal point OPERATION INDI(Failure mode) CATOR lamp Not lighted Normal Condition Remedy — 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 does not operate. Outdoor unit operates only in Test Run operation. Outdoor unit does not operate even in Test Run operation. Indoor unit operates. Outdoor unit does not operate normally. Unit does not operate normal operation in COOL or HEAT mode. Indoor unit does not receive the signal from remote controller. Indoor unit operates, when EMERGENCY OPERATION switch is pressed.
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.
OPERATION INDICATOR No. Abnormal point Operation indicator lamp Symptom Condition Remedy Left lamp lights and lower lamp flashes. 1 MXZ type Operation mode setting The operation mode of the each indoor unit Outdoor unit is differently set to COOL (includes DRY) and • Unify the operation mode. operates but HEAT at the same time, the operation mode Refer to outdoor unit service indoor unit does of the indoor unit that has operated at first has manual. not operate. the priority. 2.
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. Is there any foreign matter that interferes the rotation of the line flow fan? No Yes Remove the foreign matter and adjust the line flow fan.
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 MXZ Type Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes No Check the wiring. 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 Indoor power P.C. board, Indoor electronic control P.C. board, Receiver board, Display board, Switch board MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE Indoor power P.C. board MSZ-SF50VE Fuse (F11) Varistor (NR11) Connector Terminal Block (CN201) Connector to indoor electronic control P.C. board (CN202) Indoor fan motor (CN211) 325 VDC (–) GND (highvoltage DC) 15 VDC (+)3-6 VDC (+)0 or 15 VDC Reactor (L111) Resistor (R111) Indoor electronic control P.C.
11 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. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve Slide the sleeve. Pull the terminal while pushing the locking lever.
OPERATING PROCEDURE PHOTOS 2. Remove the indoor electrical box Photo 2 (1) Remove the panel (Refer to 1.) and the corner box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire. (3) Remove the earth wire connected to the indoor heat exchanger from the electrical box. (4) Remove the screw of the electrical cover and remove the electrical cover. (5) Disconnect following connectors:
OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to 1.) and the corner box right. (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to 2.). (4) Disconnect the following connector: CN151 (Vane motor) (5) Remove the display P.C. board holder. (6) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. (7) Remove the vane motors (Refer to 5.).
OPERATING PROCEDURE 6. 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 right. (2) Remove the indoor electronic control P.C. board holder, the electrical box and the nozzle assembly. (3) Remove the screws fixing the motor bed. (4) Release the hooks of the water cut and remove the water cut. (5) Loosen the screw fixing the line flow fan. (6) Remove the motor bed together with the indoor fan motor and the motor band.
