Mitsubishi Electric MSZ-FD25VA Service Manual
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Mitsubishi Electric MSZ-FD25VA Service Manual

Split-type, heat pump air conditioners indoor unit wireless type
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type
Models
MSZ-FD25VA -
MSZ-FD25VAS -
MSZ-FD35VA -
MSZ-FD35VAS -
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
E1
E1
E1
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······································20
11. DISASSEMBLY INSTRUCTIONS·····················36
PARTS CATALOG (OBB488)
No. OBH488
Outdoor unit service manual
MUZ-FD·VA Series(OBH489)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)

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Summary of Contents for Mitsubishi Electric MSZ-FD25VA

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS INDOOR UNIT No. OBH488 SERVICE MANUAL Wireless type Models MSZ-FD25VA - MSZ-FD25VAS - MSZ-FD35VA - MSZ-FD35VAS - Outdoor unit service manual MUZ-FD·VA Series(OBH489) MXZ-A·VA Series (OB377) MXZ-8A140A (OC316) CONTENTS 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················4 3.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MSZ-FD25VA - MSZ-FD25VAS - MSZ-FD35VA - MSZ-FD35VAS - 1. New model...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS AREA lamp POWER lamp CLEAN lamp PLASMA lamp Remote control Operation Indicator receiving section lamp Front panel Air filter Air inlet Remote controller Plasma anti-allergy enzyme filter Plasma electrode unit Plasma deodorizing filter i-see sensor Air outlet...

  • Page 5: Specification

    SPECIFICATION Indoor model MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS Single phase Power supply 230 V, 50 Hz Power input Cooling Heating Running current 1 Cooling 0.25 0.27 Heating 0.30 0.32 Fan motor current 1 Cooling 0.25 0.27 0.30 0.32 Heating Fan motor model RCOJ40-GF Dimensions WOHOD 798O295O257...

  • Page 6: Noise Criteria Curves

    NOISE CRITERIA CURVES MSZ-FD25VA MSZ-FD35VA MSZ-FD25VAS MSZ-FD35VAS 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...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-FD25VA Unit : mm MSZ-FD25VAS 11 X 20 Oblong hole 11 X 26 Oblong hole MSZ-FD35VA Installation plate MSZ-FD35VAS Indoor unit Wall hole [ 65 Air in Installation plate Piping Drain hose Air out Insulation [35 O.D Liquid line [6.35 - 0.5 m (Flared connection [6.35) Gas line...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-FD25VA Unit : mm MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS Refrigerant pipe [9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe [6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating...

  • Page 9: Service Functions

    SERVICE FUNCTIONS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS 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...
  • 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.

  • Page 11: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section VANE CONTROL button OPERATE/STOP FAN SPEED CONTROL button (ON/OFF) button OFF TIMER button OPERATION SELECT button ON TIMER button ECONO COOL button TIME SET buttons PLASMA button Temperature buttons FORWARD button...
  • Page 12 9-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. POWER 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 13 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 earlier is selected.
  • Page 14 (7) SWING ( ) mode By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. (8) Cold air prevention in HEAT operation The horizontal vane position is set to Upward. NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control doesn’t work in the indoor unit.
  • Page 15 9-6. i-see CONTROL OPERATION The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti- mating the temperature actually perceived by a person inside the room (“sensory temperature”). Advantages · The air inside the room is conditioned quickly to a comfortable condition. ·...
  • Page 16 Indoor unit installation location and air-conditioning area Installed at left Installed at center Installed at right LEFT RIGHT LEFT RIGHT LEFT RIGHT · Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit.
  • Page 17 Operation and operating range i-see sensor moves 30 degrees from the center in both right and left side. i-see Sensor turning to the center i-see Sensor turning to the right i-see Sensor turning to the left i-see Sensor operates as follows in accordance with AREA setting made with the remote controller. “AUTO”...
  • Page 18 9-9. CLEAN ( ) OPERATION • When CLEAN operation is set, it performs for 40 minutes when unit is stopped after COOL/DRY operation. CLEAN operation performs when: COOL is operated more than 3 minutes / DRY is operated more than 6 minutes. •...
  • Page 19 9-11. 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.

  • Page 20: Troubleshooting

    TROUBLESHOOTING MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS 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 21: Failure Mode Recall Function

    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.
  • Page 22 2. Flow chart of PLASMA operation failure mode recall function Operational procedure The plasma electrode unit might be abnormal. Confirm if plasma electrode unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function.
  • Page 23 4. Indoor unit failure mode table Abnormal point POWER lamp Condition Correspondence (Failure mode) Not lighted Normal — — The room temperature thermistor short Room temperature Refer to the characteristics of the room 1-time flash or open circuit is detected every 8 seconds thermistor temperature thermistor (10-7.).
  • Page 24 10-3. INSTRUCTION OF TROUBLESHOOTING w"Test Run operation" If blinking of OPERATION means the operation INDICATOR lamp cannot within 30 minutes after be checked, it can be checked Start EMERGENCY OPERATION with failure mode recall function. switch is pressed. Indoor unit Indoor unit operates.

  • Page 25: Troubleshooting Check Table

    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 the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.
  • Page 26 AREA R POWER CLEAN PLASMA Abnormal Operation indicator lamp Symptom Condition Correspondence point All lamps flash at the same time. Attachment Indoor unit • Refer to 10-6.E "Check of The electricity is not conducted to the interlock of the 0.5-second ON and outdoor installation of the horizontal switch (Fan) of the horizontal vane.
  • Page 27 10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control Indoor coil thermistor P.C.

  • Page 28: Troubleshooting Flow

    10-6. TROUBLESHOOTING FLOW POWER lamp flashes 3-time. Indoor fan does not operate. Check of indoor fan motor 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.
  • Page 29 Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller and indoor electronic control P.C. board wCheck 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 con- Replace the batteries.
  • Page 30 The unit does not operate with the remote controller. Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch. Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211, vane motor connector CN151 and the i-see Sensor motor connector CN110 from the indoor electronic control P.C.
  • Page 31 • Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • POWER lamp flashes ON and OFF every 0.5-seconds. Outdoor unit does not operate. How to check miswiring and serial signal error Turn OFF the power supply.
  • Page 32 All lamps flash ON and OFF every 0.5-second. Indoor unit and outdoor unit do not operate. Check of installation of the horizontal vane Turn OFF the power supply. Relock the stopper of the Is the stopper of the horizontal vane horizontal vane to the indoor unit.

  • Page 33: Electromagnetic Noise Enters Into Tv Sets Or Radios

    Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3 m, or is the unit, and/or the antennas and distance between the the outdoor unit.
  • Page 34 10-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS 1. Indoor electronic control P.C. board. Cement resistor 5 VDC 12 VDC (R111) Indoor fan motor (CN211) 1325 VDC 3(-) Fiducial terminal of cathode side on measur- ing high-voltage DC 415 VDC 5(+)3-6 VDC 6(+)0 or 15 VDC...
  • Page 35 2. Power monitor receiver P.C. board 3. Monitor P.C. board 4. Plasma power P.C. board 3DC 2.5 V during PLASMA DEODORIZING operation 2GND 1DC 12.5 V during PLASMA DEODORIZING operation...

  • Page 36: 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 37 OPERATING PROCEDURE PHOTOS 2. Removing the electronic control P.C. board, the Photo 2 power monitor receiver P.C. board, i-see Sensor, SW P.C. board and the terminal block (1) Remove the panel (Refer to 1.) and the corner box. Screws of the (2) Remove the screw of the V.A.
  • Page 38 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 5 (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire, the sensor holder, the electrical cover and the earth wire. (Refer to (3) Disconnect the following connectors on the electronic con- trol P.C.
  • Page 39 OPERATING PROCEDURE PHOTOS 6. Removing the horizontal vane motor Photo 9 Screws of the horizontal (1) Remove the nozzle assembly.(Refer to 4.) vane motor unit cover (2) Remove the screws of the horizontal vane motor unit, and pull out the horizontal vane motor unit. (4) Remove the screws of the horizontal vane motor unit cover.
  • Page 40 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Aug. 2007 Distributed in Aug. 2007. No. OBH488 6 Specifications subject to change without notice. Made in Japan...

This manual is also suitable for:

Msz-fd35vaMsz-fd25vasMsz-fd35vas

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