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INDOOR UNIT
SERVICE MANUAL
Models
MS-GK24VA
MS-GK30VAT
MS-GK36VAT
MS-GK24VA
MS-GK30VAT
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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KU1
KU2
KU2
U
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KU1
KU2
KU2
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,
U
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KU1
KU2
KU2
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U
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS ······························ 11
8. MICROPROCESSOR CONTROL ················ 13
9. TROUBLESHOOTING ······························· 21
10. DISASSEMBLY INSTRUCTIONS ················· 36
PARTS CATALOG (OBB734)
Revision B:
• MS-GK24VA-
KU2 U
VAT-
have been added.
KU2 U
OBH734 REVISED EDITION-A is void.
No. OBH734
REVISED EDITION-B
Outdoor unit service manual
MU-GK∙VA(T) Series (OBH735)
, MS-GK30/36
TM
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Table of Contents
Related Manuals for Mitsubishi Electric MS-GK24VA
Summary of Contents for Mitsubishi Electric MS-GK24VA
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Page 1: Table Of Contents
Revision B: • MS-GK24VA- , MS-GK30/36 KU2 U VAT- have been added. KU2 U OBH734 REVISED EDITION-A is void. INDOOR UNIT No. OBH734 REVISED EDITION-B SERVICE MANUAL Models MS-GK24VA MS-GK30VAT MS-GK36VAT Outdoor unit service manual MU-GK∙VA(T) Series (OBH735) CONTENTS 1. TECHNICAL CHANGES ······························2 2. -
Page 2: Technical Changes
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. Revision A: • MS-GK24VA- , MS-GK30/36VAT- have been added. Revision B: •... -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MS-GK24VA MS-GK30VAT 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... - Page 4 MS-GK36VAT Air cleaning lter (Anti-Allergy Enzyme Filter, option) Front panel Air lter (Catechin air lter) Air inlet Emergency operation switch Display section Air outlet Horizontal vane Operation indicator lamp Remote controller Remote control receiving section ACCESSORIES Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Screw for 3.5 x 16 mm (Black)
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Page 5: Specification
SPECIFICATION Indoor model MS-GK24VA MS-GK30VAT MS-GK36VAT Function Cooling Power supply Single phase 220 - 230 - 240 V, 50 Hz Running current 0.53 0.56 0.52 Power input Model RC0J50-MA RC0J56-AC Current 0.53 0.56 0.52 Dimensions W × H × D... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MS-GK24VA MS-GK30VAT 11×26 Oblong hole 11×20 Oblong hole Installation plate 1100 1090 199.5 199.5 Indoor unit 110.5 49.5 500.5 439.5 Air in Installation plate Wall hole Ø75 Piping ( 70° ) Drain hose Air out... - Page 7 Unit: mm MS-GK36VAT Indoor unit 119.5 67.7 1155 Wall hole 75 Air in 1170 Installation plate Piping Drain hose 150.5 Air out Piping Insulation 9.52 - 0.5m 31 O.D Liquid line (Flared connection 9.52) 15 I.D 15.88 - 0.4m 50 O.D Joint connection 15.88-0.4m Wireless remote controller Gas line...
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Page 8: Wiring Diagram
WIRING DIAGRAM MS-GK24VA- MS-GK30VAT- MS-GK36VAT- MS-GK36VAT- OBH734B... -
Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MS-GK24VA Unit: mm Refrigerant pipe ø15.88 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling MS-GK30VAT Refrigerant pipe ø15.88... - Page 10 MS-GK36VAT Refrigerant pipe 19.05 (with heat insulator) Indoor coil Flared connection Indoor thermistor heat Joint RT12 (MAIN) exchanger Joint connection Indoor coil thermistor RT13 (SUB) Room temperature thermistor RT11 Strainer Flared connection Refrigerant pipe 9.52 (with heat insulator) Refrigerant flow in cooling OBH734B...
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Page 11: Service Functions
SERVICE FUNCTIONS MS-GK24VA MS-GK30VAT MS-GK36VAT 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 12 Turn off the main power for the unit. Solder the jumper wire to JR07 on the indoor electronic control P.C. board (MS-GK36VAT). Cut the jumper wire to JR77 on the indoor electronic control P.C. board (MS-GK24VA/GK30VAT). (Refer to 9-7.) MS-GK24VA/GK30VAT...
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Page 13: Microprocessor Control
MICROPROCESSOR CONTROL MS-GK24VA MS-GK30VAT MS-GK36VAT WIRELESS REMOTE CONTROLLER MS-GK24VA MS-GK30VAT Signal transmitting section WIDE VANE button Operation display section (Vertical vane button) FAN SPEED CONTROL button OPERATE/STOP(ON/OFF) OFF-TIMER button OPERATION SELECT button button ( STOP/OPERATE(OFF/ON) ON-TIMER button ECONO COOL button... - Page 14 The room temperature is About 1 to 2°C away from approaching the set tem- set temperature perature. 8-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- /GK30VAT- )/ STOP/OPERATE (OFF/ON) (MS-GK24VA- /GK30VAT- /MS-GK36VAT) button. KU2 U KU2 U OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
- 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 To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation: ECONO COOL, VANE CONTROL, LONG or POWERFUL COOL (MS-GK24VA MS-GK30VAT) button. NOTE : ECONO COOL operation does not work in COOL mode of “I FEEL CONTROL”.
- Page 17 Solid arrow : When the LONG mode is used. Dotted arrow : When the LONG mode is not used. 2. Vertical vane (MS-GK24VA/GK30VAT) (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor.
- Page 18 Indoor fan speed becomes faster than setting fan speed on the remote controller even when is selected. Horizontal AIR FLOW blowing range About 100 8-6. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- /GK30VAT- )/ STOP/OPERATE (OFF/ON) (MS-GK24VA- /GK30VAT- /MS-GK36VAT) button.
- Page 19 PROGRAM TIMER • OFF timer and ON timer can be used in combination. 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 20 Emergency operation continues until EMERGENCY OPERATION switch is pressed again or the unit receives any signal from the remote controller. In the latter case, normal operation will start. NOTE: Do not press EMERGENCY OPERATION switch during normal operation. MS-GK24VA MS-GK30VAT Operation mode COOL Set temperature 24°C...
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Page 21: Troubleshooting
TROUBLESHOOTING MS-GK24VA MS-GK30VAT MS-GK36VAT 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 22 Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed. Then release the buttons. Press OPERATE/STOP (ON/OFF) (MS-GK24VA- / GK30VAT- STOP/OPERATE(OFF/ON) (MS-GK24VA-...
- Page 23 NOTE: Blinking patterns of this mode differ from the ones of 2. Indoor unit failure recall mode table TROUBLESHOOTING CHECK TABLE (9-4.). Upper/Left lamp Abnormal point of OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lighted Normal — — The room temperature thermistor short or 1-time fl...
- Page 24 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit oper- Indoor unit does OPERATION INDICATOR MS-GK24VA/GK30VAT not receive the ates. lamp on the indoor unit is Indoor and outdoor unit Outdoor unit signal from re- fl ashing ON and OFF. do not operate.
- Page 25 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. •The following indication applies regardless of shape of the indicator. OPERATION INDICATOR (MS-GK24VA/GK30VAT) Lighted Not lighted OPERATION INDICATOR (MS-GK36VAT)
- Page 26 9-5. TROUBLE CRITERION OF MAIN PARTS Part name Check method and criterion Figure MS-GK24VA/GK30VAT Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C. Indoor coil thermistor board" for the chart of thermistor.
- Page 27 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor MS-GK24VA/GK30VAT/GK36VAT 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.
- Page 28 Check if the remote controller is exclusive for this air conditioner. MS-GK24VA/GK30VAT Press OPERATE/STOP (ON/OFF) (MS- GK24VA- /GK30VAT- STOP/OPERATE(OFF/ON) (MS-GK24VA- KU2 U button on the remote GK30VAT- KU2 U controller. 1 Look at the image of the signal transmitting section of...
- Page 29 MS-GK36VAT Press STOP/OPERATE (OFF/ON) button on the remote controller. 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone. It is normal if the LED of the signal transmitting section lights up when the STOP Replace the batteries.
- Page 30 Check of indoor electronic control P.C. board and indoor fan motor MS-GK24VA/GK30VAT 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.
- Page 31 MS-GK36VAT Turn OFF the power supply. Measure the resistance between CN211 Remove indoor fan motor connector CN211 and Short circuit: of the indoor fan motor connector. Replace the indoor fan motor. vane motor connector CN151 and CN152 from the indoor electronic control P.C.
- Page 32 How to check miswiring and serial signal error MS-GK36VAT Turn OFF the power supply. Is there rated voltage Check the power in the power supply? supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
- Page 33 1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) (MS-GK24VA- /GK30VAT- button on the remote controller for power ON, and...
- Page 34 9-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board, Indoor terminal P.C. board, Power monitor receiver SW P.C. board MS-GK24VA MS-GK30VAT Indoor electronic control P.C. board To disable "Auto restart function", Indoor terminal P.C. board cut the Jumper wire to JR77.
- Page 35 2. Indoor electronic control P.C. board MS-GK36VAT Power supply input Resistor Varistor (NR11) 220-230-240 VAC (R111) To disable "Auto restart Fuse (F11) function", T3.15AL250V solder the Jumper wire to JR07. (Refer to 7-3.) Indoor fan motor (CN211) 311 - 325 - 339 VDC (–) GND (high-voltage DC) 15 VDC...
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Page 36: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 10-1. MS-GK24VA MS-GK30VAT NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the horizontal vanes. - Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electrical box Photo 3 (1) Remove the panel (Refer to 1.) and the right corner box. Upper catch (2) Remove the indoor/outdoor connecting wire. (Refer to 2.) (3) Remove the earth wire connected to the indoor heat exchanger from the electrical box.
- Page 38 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 5. Removing the vertical vane motor unit Screws of vertical vane motor unit cover (1) Remove the nozzle assembly. (Refer to 4.) (2) Remove the crank of the vertical vane motor unit from the arm of the vertical vane. (3) Remove the screw of the vertical vane motor unit, and pull the vertical vane motor unit.
- 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 10-2. MS-GK36VAT NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 Front panel (1) Press and unlock the knobs on both sides of the front panel and lift the front panel until it is level, and then pull the hinges forward to remove the front panel.
- Page 41 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 3. Removing the nozzle assembly (1) Remove the panel and the corner box. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the electrical side cover, and disconnect the vane motor connector. (4) Pull out the drain hose from the nozzle assembly, and Screw of electrical remove the nozzle assembly.
- Page 42 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 6. Removing the line fl ow fan and the indoor fan motor (1) Remove the panel and the corner box. (Refer to 1.) Screw of the motor band (2) Remove the electrical box. (Refer to 2.) (3) Remove the nozzle assembly.
- Page 43 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
- Page 44 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2016 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2017. No. OBH734 REVISED EDITION-B Issued: Jun. 2016. No. OBH734 REVISED EDITION-A Published: Mar. 2016. No. OBH734 Made in Japan Specifications are subject to change without notice.