Mitsubishi Electric MS-GF20VA-E1 Service Manual

Mitsubishi Electric MS-GF20VA-E1 Service Manual

Mitsubishi electric split-type air conditioner indoor unit
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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models
MS-GF20VA
MS-GF25VA
MS-GF35VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
-
E1
-
E1
-
E1
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 6
7. REFRIGERANT SYSTEM DIAGRAM ··············· 7
8. SERVICE FUNCTIONS ····································· 8
9. MICROPROCESSOR CONTROL ··················· 10
10. TROUBLESHOOTING ····································· 15
11. DISASSEMBLY INSTRUCTIONS ···················· 25
PARTS CATALOG (OBB621)
No. OBH621
Outdoor unit service manual
MU-GF·VA Series (OBH622)

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Summary of Contents for Mitsubishi Electric MS-GF20VA-E1

  • Page 1: Table Of Contents

    SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT No. OBH621 SERVICE MANUAL Models MS-GF20VA MS-GF25VA MS-GF35VA Outdoor unit service manual MU-GF·VA Series (OBH622) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. NOISE CRITERIA CURVES ······························ 5 5.
  • Page 2: Technical Changes

    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: Part Names And Functions

    PART NAMES AND FUNCTIONS MS-GF20VA MS-GF25VA MS-GF35VA Front panel Air filter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter, option) Air inlet Air outlet Heat exchanger Horizontal vane Display section Remote control receiving section Operation indicator lamp Emergency operation switch (E.O. SW) Remote controller ACCESSORIES MS-GF20VA...
  • Page 4: Specification

    SPECIFICATION Indoor model MS-GF20VA MS-GF25VA MS-GF35VA Function Cooling Power supply Single phase 230 V, 50 Hz Running current 0.20 0.22 Power input Model RC4V18-FA Current 0.22 0.20 Dimensions W × H × D 798 x 295 x 232 Weight Air direction Super High (POWERFUL) High Med.
  • Page 5: Noise Criteria Curves

    NOISE CRITERIA CURVES MS-GF20VA MS-GF25VA FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE Super High COOLING Super High COOLING 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 4000 8000...
  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm MS-GF20VA MS-GF25VA MS-GF35VA 11×20 Oblong hole 11×26 Oblong hole Installation plate Wall hole ø65 Air in Indoor unit Installation plate Piping Drain hose Air out Insulation ø35 O.D Liquid line ø7 - 0.5 m (Flared connection ø6.35) Gas line ø9.52 - 0.43 m (Flared connection: ø9.52) Drain hose...
  • Page 7: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit: mm MS-GF20VA MS-GF25VA Refrigerant pipe 9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe 6.35 (with heat insulator) Refrigerant flow in cooling MS-GF35VA Refrigerant pipe 9.52 (with heat insulator) Indoor coil...
  • Page 8: Service Functions

    SERVICE FUNCTIONS MS-GF20VA MS-GF25VA MS-GF35VA 8-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) 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.
  • Page 9 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 10: Microprocessor Control

    MICROPROCESSOR CONTROL WIRELESS REMOTE CONTROLLER MS-GF20VA MS-GF25VA MS-GF35VA Signal transmitting section Operation display section FAN SPEED CONTROL button OPERATE/STOP OFF-TIMER button (ON/OFF) button OPERATION SELECT button ON-TIMER button ECONO COOL button TIME SET buttons POWERFUL COOL button FORWARD button Temperature buttons BACKWARD button CLOCK button RESET button...
  • Page 11: Obh621

    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.
  • Page 12: Obh621

    (4) The initial set temperature is decided by the initial room temperature. Initial room temperature Initial set temperature Mode 26 °C or more 24 °C COOL mode of “I FEEL CONTROL” Initial room temperature 25 °C to 26 °C °C minus 2 DRY mode of Initial room temperature...
  • Page 13: Obh621

    (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 4 or 5 when the compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
  • Page 14: Obh621

    PROGRAM TIMER • OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
  • Page 15: Troubleshooting

    TROUBLESHOOTING MS-GF20VA MS-GF25VA MS-GF35VA 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: Obh621

    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.
  • Page 17: Obh621

    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: Obh621

    10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit oper- Indoor unit does OPERATION INDICATOR Indoor and ates. not receive the lamp on the indoor unit is outdoor unit signal from re- Outdoor unit fl ashing ON and OFF. do not operate. does not operate.
  • Page 19: Obh621

    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 lamp The operation indicator lamp is at the right side of the indoor unit.
  • Page 20: Obh621

    10-5. TROUBLE CRITERION OF MAIN PARTS 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", "1. Indoor electronic control Indoor coil thermistor P.C. board", for the chart of thermistor. (RT12) Measure the resistance with a tester.
  • Page 21: Obh621

    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 22: Obh621

    Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Measure the resistance of indoor fan motor. Remove indoor fan motor connector CN211 from indoor Short circuit Refer to 10-5. Replace the indoor fan motor. power P.C.
  • Page 23: Obh621

    D 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 24: Obh621

    MS-GF20VA MS-GF25VA MS-GF35VA 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. 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 (CN112) Vane motor (CN151) Indoor coil thermistor (RT12) Room temperature thermistor (RT11) Connector to Indoor power P.C.
  • Page 25: 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 26: Obh621

    OPERATING PROCEDURE PHOTOS Electrical box 2. Removing the indoor electronic control P.C. Photo 2 Earth wire board and the room temperature thermistor (1) Remove the panel (Refer to 1.) and the corner box. Screw of the electrical cover (2) Remove the screw of the V.A. clamp and the V.A. clamp.
  • Page 27: Obh621

    OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to 1.) and the corner box. Screws of horizontal vane motor unit (2) Remove the indoor/outdoor connecting wire (Refer to 2 (2)-(4).). (3) Remove the indoor electronic control P.C. board holder. (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
  • Page 28: Obh621

    Screws of the left side of the heat exchanger HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct. 2012. No. OBH621 New publication, effective Oct. 2012 Made in Japan Specifications are subject to change without notice.

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