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INDOOR UNIT
SERVICE MANUAL
Models
MS-GH13VA
MS-GH18VA
MS-GH24VA
MS-GH30VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
,
,
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KU1
KU2
KU2
U
,
,
-
KU1
KU2
KU2
U
-
KU1
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KU1
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS ······························ 10
8. MICROPROCESSOR CONTROL ················ 12
9. TROUBLESHOOTING ······························· 19
10. DISASSEMBLY INSTRUCTIONS ················· 33
PARTS CATALOG (OBB664)
Revision B:
•MS-GH13/18VA-
KU2
U
added.
OBH664 REVISED EDITION-A is void.
No. OBH664
REVISED EDITION-B
Outdoor unit service manual
MU-GH∙VA Series (OBH665)
have been
TM
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Table of Contents
Related Manuals for Mitsubishi Electric MS-GH13VA
Summary of Contents for Mitsubishi Electric MS-GH13VA
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Page 1: Table Of Contents
•MS-GH13/18VA- have been added. OBH664 REVISED EDITION-A is void. INDOOR UNIT No. OBH664 REVISED EDITION-B SERVICE MANUAL Models MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA Outdoor unit service manual MU-GH∙VA Series (OBH665) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3. -
Page 2: Technical Changes
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: •MS-GH13/18VA- have been added. Revision B: •MS-GH13/18VA- have been added. TECHNICAL CHANGES MS-GH13VA - MS-GH18VA - MS-GH24VA - MS-GH30VA - 1. New model MS-GH13VA- MS-GH13VA- MS-GH18VA- MS-GH18VA- 1. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MS-GH13VA Front panel Air fi lter (Nano platinum fi lter) Air cleaning fi lter (Electrostatic anti-allergy enzyme fi lter, option) Air inlet Remote controller Air outlet Heat exchanger Horizontal vane Display section Remote control receiving section Operation indicator lamp Emergency operation switch (E.O. - Page 4 MS-GH18VA MS-GH24VA MS-GH30VA Front panel Air fi lter (Nano platinum fi lter) Air cleaning fi lter (Electrostatic anti-allergy enzyme fi lter, option) Air inlet Remote controller Air outlet Heat exchanger Horizontal vane Display section Operation indicator lamp Emergency operation switch (E.O.SW) Remote control receiving section ACCESSORIES...
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Page 5: Specification
SPECIFICATION Indoor model MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA Function Cooling Power supply Single phase 220 - 230 - 240 V, 50 Hz Running current 0.22 0.30 0.42 Power input Model RC4V18-FA RC0J56-AF Current 0.22 0.30 0.42 Dimensions W × H × D... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MS-GH13VA 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) -
Page 7: Wiring Diagram
WIRING DIAGRAM MS-GH13VA- MS-GH13VA- OBH664B... - Page 8 MS-GH18VA- MS-GH24VA MS-GH30VA MS-GH18VA- OBH664B...
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Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MS-GH13VA 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-GH18VA MS-GH24VA MS-GH30VA Refrigerant pipe ø12.7 (MS-GH18VA) -
Page 10: Service Functions
SERVICE FUNCTIONS MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA 7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board. (Refer to 9-7.) Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by bridging JPG and JPS.) - Page 11 How to disable “AUTO RESTART FUNCTION” Turn off the main power for the unit. Solder the jumper wire to JR07 on the indoor electronic control P.C. board (MS-GH13VA). Cut the jumper wire to JR77 on the indoor electronic control P.C. board (MS-GH18/24/30VA). (Refer to 9-7.)
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Page 12: Microprocessor Control
MICROPROCESSOR CONTROL WIRELESS REMOTE CONTROLLER MS-GH13VA- 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... - Page 13 MS-GH18VA- MS-GH24VA MS-GH30VA Signal transmitting section WIDE VANE button Operation display section (Vertical vane button) 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 LONG BACKWARD button...
- Page 14 INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. •The following indication applies regardless of shape of the indication. Indication Operation state Room temperature Lighted The unit is operating to About 2°C or more away reach the set temperature from set temperature...
- Page 15 Operation timer chart Example Previous operation Restart COOL mode of COOL mode of “I FEEL CONTROL” “I FEEL CONTROL” or COOL mode When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at start-up of the operation.
- Page 16 8-5. 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 (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
- Page 17 (10) LONG MODE ( ) (MS-GH18/24/30VA) By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller, and the horizontal vane moves to the position for LONG mode. The remote controller displays “ ”. To cancel this opera- tion, press one of the following buttons: LONG, VANE CONTROL, or ECONO COOL (during cool mode).
- Page 18 2. To release the timer To release ON timer, press ON TIMER button ( To release OFF timer, press OFF TIMER button( TIMER is cancelled and the display of set time disappears. PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. •...
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Page 19: Troubleshooting
TROUBLESHOOTING MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA 9-1. 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 20 Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. 1. Flow chart of failure mode recall function for the indoor unit MS-GH13VA MS-GH18/24/30VA Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
- Page 21 NOTE: Blinking patterns of this mode differ from the ones of 2. The table of indoor unit failure mode recall function TROUBLESHOOTING CHECK TABLE (9-4.). Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lighted Normal —...
- Page 22 9-3. 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 23 9-4. 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 24 Refer to 9-7. "Test point diagram and voltage", for the chart of thermistor. Indoor coil thermistor (RT12) Measure the resistance with a tester. MAIN MS-GH13VA (Part temperature 10 ~ 30 °C) AUX. Color of the lead wire Normal Indoor fan motor (MF)
- Page 25 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor MS-GH13VA Turn OFF the power supply. Check connector CN211 visually. Are soldered points of the Reconnect the lead wires. Are lead wires connected? Resolder it. connector correctly soldered to the indoor power P.C. board? Disconnect lead wires from connector CN211 on indoor power P.C.
- Page 26 MS-GH18/24/30VA 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. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
- Page 27 (Not clear) the signal transmitting section lights up when the OPERATE/STOP (ON/OFF) (MS-GH13VA )/ STOP/ OPERATE ( (OFF/ON) (MS-GH13VA KU2 U Remove the batteries, then set them back button on the remote controller is pressed. However, it and press RESET button. (Refer to 9-1.4.) may be diffi...
- Page 28 Check of indoor electronic control P.C. board and indoor fan motor MS-GH13VA Turn OFF the power supply. Measure the resistance of indoor fan motor. Remove indoor fan motor connector CN211 from indoor Short circuit Refer to 9-5. power P.C. board and vane motor connector CN151 Replace the indoor fan motor.
- Page 29 MS-GH18/24/30VA Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor Short circuit: Measure the resistance between CN211 Replace the indoor fan motor. connectors CN151 and CN152 from the indoor electronic of the indoor fan motor connector. control P.C.
- Page 30 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 31 9-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board MS-GH13VA Timer short mode point JPG, JPS (Refer to 7-1.) 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 32 3. Indoor electronic control P.C. board, Indoor terminal P.C. board, Power monitor receiver SW P.C. board MS-GH18VA MS-GH24VA MS-GH30VA Indoor electronic control P.C. board To disable "Auto restart function", Indoor terminal P.C. board cut the Jumper wire to JR77. Indoor coil thermistor (Refer to 7-3.) Resistor Fuse...
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Page 33: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 10-1. MS-GH13VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the horizontal vanes. - Page 34 OPERATING PROCEDURE PHOTOS/FIGURES 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 35 OPERATING PROCEDURE PHOTOS/FIGURES 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 36 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 5 thermistor, and the line flow fan (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor electronic control P.C. board hold- er, the electrical box and the nozzle assembly.
- Page 37 10-2. MS-GH18VA MS-GH24VA MS-GH30VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the horizontal vanes. Horizontal vanes Front panel (2) Remove the screw caps of the panel. Remove the screws of the panel.
- Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Photo 2) (3) Remove the electrical cover. (Photo 2) (4) Disconnect the following connectors on the electronic control P.C.
- Page 39 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the water cut, the indoor fan motor, Photo 8 the indoor coil thermistor, and the line flow fan (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the power monitor receiver holder, the electri- cal box and the nozzle assembly.
- Page 40 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2017. No. OBH664 REVISED EDITION-B Issued: Jun. 2016. No. OBH664 REVISED EDITION-A Published: Aug.