Mitsubishi Electric MSZ-GL06NA-U1 Service Manual
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Mitsubishi Electric MSZ-GL06NA-U1 Service Manual

Indoor unit
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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-GL06NA -
MSZ-GL09NA -
MSZ-GL12NA -
MSZ-GL15NA -
MSZ-GL18NA -
MSZ-GL24NA -
MSZ-GL18NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision C:
• For the airflow of MSZ-GL24NA-
GL24NA-
been corrected (3. SPECIFICATION).
MSY-GL09NA -
U1
MSY-GL12NA -
U1
MSY-GL15NA -
U1
MSY-GL18NA -
U1
MSY-GL24NA -
U1
U1
Outdoor unit service manual
MUZ-GL•NA, MUY-GL•NA Series (OBH733)
MXZ-C•NA, MXZ-C•NAHZ Series (OCH573)
CONTENTS
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································6
4. OUTLINES AND DIMENSIONS ·····················8
5. WIRING DIAGRAM ··································· 10
6. REFRIGERANT SYSTEM DIAGRAM ··········· 12
7. SERVICE FUNCTIONS ······························ 13
8. MICROPROCESSOR CONTROL ················ 15
9. TROUBLESHOOTING ······························· 23
10. DISASSEMBLY INSTRUCTIONS ················· 41
PARTS CATALOG (OBB732)
on the specification table has
U1
OBH732 REVISED EDITION-A is void.
No. OBH732
REVISED EDITION-C
· ·······························
and MSY-
U1
U1
U1
U1
U1
U1
2

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Summary of Contents for Mitsubishi Electric MSZ-GL06NA-U1

  • Page 1: Table Of Contents

    Revision C: • For the airflow of MSZ-GL24NA- and MSY- GL24NA- on the specification table has been corrected (3. SPECIFICATION). OBH732 REVISED EDITION-A is void. INDOOR UNIT No. OBH732 SERVICE MANUAL REVISED EDITION-C Models MSZ-GL06NA - MSY-GL09NA - MSZ-GL09NA - MSY-GL12NA - MSZ-GL12NA - MSY-GL15NA -...

  • Page 2: Msy-Gl18Na

    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.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA Air fi lter (Nano platinum fi lter) Front panel Air cleaning fi lter (Anti-Allergy Enzyme Filter) Air inlet Heat exchanger Remote controller Air outlet Horizontal vane Display section Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES...
  • Page 4 MSZ-GL18NA MSY-GL18NA Air inlet Front panel Air fi lter (Nano platinum fi lter) Air cleaning fi lter Heat exchanger (Anti-Allergy Enzyme Filter) Air outlet Horizontal vane Remote controller Display section Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Installation plate fixing screw 4 ×...
  • Page 5 MSZ-GL24NA MSY-GL24NA Front panel Air fi lter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter) Air inlet Air outlet Remote controller Heat exchanger Horizontal vane Display section Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES Installation plate Installation plate fixing screw 4 ×...

  • Page 6: Specification

    SPECIFICATION MSZ-GL09NA MSZ-GL12NA Indoor model MSZ-GL06NA MSY-GL09NA MSY-GL12NA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/ Disconnect switch A Min. circuit ampacity Fan motor F.L.A 0.76 COOL Dry 399 - 321 - 237 - 170 - 145 Airflow (Wet) (364 - 286 - 201 - 134 - 109)
  • Page 7 3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) 208/230 V Min. 187 Max. 253 Indoor unit 1 phase 60 Hz (2) OPERATION Intake air temperature (°F) Mode Condition Indoor Outdoor Standard temperature — Maximum temperature — Cooling Minimum temperature —...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA Unit: inch MSY-GL09NA MSY-GL12NA MSY-GL15NA Insulation ø1 - 3/8 O.D Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4) Gas line ø3/8 16 - 15/16 (Flared connection: ø3/8 (GL06/09/12NA), ø1/2 (GL15NA)) Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D MSZ-GL18NA MSY-GL18NA...
  • Page 9 MSZ-GL24NA Unit: inch MSY-GL24NA OBH732C...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA MSZ-GL18NA MSY-GL18NA OBH732C...
  • Page 11 MSZ-GL24NA MSY-GL24NA OBH732C...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA Unit: inch (mm) MSY-GL09NA MSY-GL12NA MSY-GL15NA Refrigerant pipe ø3/8 (ø9.52) (MSZ-GL06/09/12NA, MSY-GL09/12NA) ø1/2 (ø12.7) (MSZ-GL15NA, MSY-GL15NA) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11...

  • Page 13: Service Functions

    SERVICE FUNCTIONS MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSZ-GL18NA MSZ-GL24NA MSY-GL09NA MSY-GL12NA MSY-GL15NA MSY-GL18NA MSY-GL24NA 7-1. TIMER SHORT MODE For service, the set time can be shortened by bridging of the timer short point on the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) •...
  • Page 14 7-3. 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 shut-off of the main power. Operation If the main power has been cut, the operation settings remain.

  • Page 15: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSZ-GL18NA MSZ-GL24NA MSY-GL09NA MSY-GL12NA MSY-GL15NA MSY-GL18NA MSY-GL24NA WIRELESS REMOTE CONTROLLER E.g.: MSZ type MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA Signal transmitting section Operation display section STOP/OPERATE FAN SPEED CONTROL button (OFF/ON) button OFF TIMER button OPERATION SELECT button ON TIMER button ECONO COOL button...
  • Page 16 MSZ-GL24NA MSY-GL24NA Signal transmitting section Operation display section VANE CONTROL button STOP/OPERATE (Horizontal vane button) FAN SPEED CONTROL button (OFF/ON) button OPERATION SELECT button OFF TIMER button TEMPERATURE buttons ECONO COOL button ON TIMER button WIDE VANE button TIME SET buttons (Vertical vane button) FORWARD button BACKWARD button...
  • Page 17 8-1. COOL ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR 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 61 ~ 88°F (16 ~ 31°C).
  • Page 18 (4) The initial set temperature is decided by the initial room temperature. Initial room temperature Model Initial set temperature 79°F (26°C) or more 75°F (24°C) COOL mode of "I FEEL CONTROL" 77 to 79°F (25 to 26°C) Initial room temperature minus 4°F (2°C) DRY mode of Less than 79°F (25°C) Initial room temperature minus 4°F (2°C)
  • Page 19 8-7. 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 20 2. Vertical vane (MSZ-GL18/24NA MSY-GL18/24NA) (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. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
  • Page 21 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 22 8-10. EMERGENCY/TEST OPERATION In the 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 when the batteries in the remote Operation mode COOL HEAT (MSZ)

  • Page 23: Troubleshooting

    TROUBLESHOOTING MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSZ-GL18NA MSZ-GL24NA MSY-GL09NA MSY-GL12NA MSY-GL15NA MSY-GL18NA MSY-GL24NA 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 unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 24 9-2. 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 (9-4.) disappears, the memorized failure details can be recalled. MSZ-GL06/09/12/15NA MSZ-GL18NA MSZ-GL24NA...
  • Page 25 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 flash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
  • Page 26 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit oper- Indoor unit does OPERATION INDICATOR Outdoor unit does not receive the ates. lamp on the indoor unit is not operate normally. signal from re- Outdoor unit flashing ON and OFF. does not operate.
  • Page 27 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 Lighted Blinking...
  • Page 28 OPERATION INDICATOR Abnormal Remedy Operation indicator lamp Symptom Condition point Upper lamp lights and lower lamp flashes. The operation mode of the each indoor unit MXZ type Outdoor unit is differently set to COOL (includes DRY) and • Unify the operation mode. Operation operates but HEAT at the same time, the operation mode...
  • Page 29 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor MSZ-GL06/09/12/15/18NA MSY-GL09/12/15/18NA The indoor fan motor error has occurred, and the indoor fan does not operate. Pay enough attention to the high voltage on the fan motor connector. Turn OFF the power supply. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
  • Page 30 MSZ-GL24NA MSY-GL24NA 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. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
  • Page 31 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. MSZ-GL06/09/12/15/18NA MSY-GL09/12/15/18NA Press STOP/OPERATE (OFF/ON) 1 Look at the image of the signal transmitting section of button on the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
  • Page 32 C Check of indoor P.C. board and indoor fan motor MSZ-GL06/09/12/15NA MSY-GL09/12/15NA Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
  • Page 33 MSZ-GL18NA MSY-GL18NA Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short/ open circuit: motor connector CN151 from the indoor motor. Replace the indoor fan motor. electronic control P.C.
  • Page 34 MSZ-GL24NA MSY-GL24NA Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor Short/ open 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 35 D How to check miswiring and serial signal error MSZ-GL06/09/12/15NA Turn OFF the power supply. MSY-GL09/12/15NA Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
  • Page 36 MSZ-GL18/24NA MSY-GL18/24NA Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>...
  • Page 37 E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft.(3 m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
  • Page 38 9-7. Test point diagram and voltage MSZ-GL06/09/12/15NA MSY-GL09/12/15NA 1. Indoor power P.C. board, Indoor terminal P.C. board Indoor terminal P.C. board Indoor power P.C. board Varistor (NR11) Resistor (R111) Fuse (F11)( ) Indoor fan motor (CN211) (+)0-6 V (+)3-6 VDC 15 VDC (–) GND (high- voltage DC)
  • Page 39 MSZ-GL18NA MSY-GL18NA 3. Indoor power P.C. board Connector to indoor electronic 12 VDC 5 VDC control P.C. board (CN20A) Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Varistor (NR11) Connector to Indoor fan Resistor (R111) motor (CN211) 294/325 VDC (+)0 or 15 VDC (-) GND (High (+)3-6 VDC voltage DC)
  • Page 40 MSZ-GL24NA MSY-GL24NA 5. Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board Indoor terminal P.C. board Indoor electronic control P.C. board To disable "Auto restart func- tion" cut the Jumper wire to Fuse Terminal Varistor Resistor 12 VDC...

  • Page 41: 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 2 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 42 OPERATING PROCEDURE PHOTOS 2. Removing the indoor electronic control P.C. Photo 2 Electrical box Ground wire board and the room temperature thermistor (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the screw of the V.A. clamp and the V.A. Screw of the clamp.
  • Page 43 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 5 (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire (Refer to 2 (2)-(7).). (3) Remove the indoor electronic control P.C. board hold- (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
  • Page 44 OPERATING PROCEDURE PHOTOS 6. Removing the indoor fan motor, the indoor coil Photo 6 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 45 10-2. MSZ-GL18NA MSY-GL18NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (1) Remove the screw caps on the panel and remove the Front panel screws of the panel. (2) Pull the panel slightly toward you, and then remove the panel by pushing it upward.
  • Page 46 OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the Photo 2 electrical box (1) Remove the panel. (Refer to 1.) Remove the right cor- Screws of ner box. the ground plate Water cover (2) Disconnect the following connectors: <Indoor electronic control P.C.
  • Page 47 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. Photo 5 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to 1.) Remove the right corner Catch box. Indoor electronic (2) Disconnect the following connectors: control P.C. board <Indoor electronic control P.C.
  • Page 48 OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil Photo 7 thermistor and the line flow fan (1) Remove the panel. (Refer to 1.) Remove the right cor- ner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly.
  • Page 49 10-3. MSZ-GL24NA MSY-GL24NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 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. (3) Hold the lower part of both ends of the panel and pull it slightly toward you, and then remove the panel by pushing it upward.
  • Page 50 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to 1.) and the right corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Refer to 2 (2)-(4).) (3) Remove the electrical cover. (Photo 2) (4) Disconnect the following connectors on the electronic control P.C.
  • Page 51 OPERATING PROCEDURE PHOTOS 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 right corner box. (2) Remove the power monitor receiver holder, the electri- cal box and the nozzle assembly.
  • Page 52 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2017. No. OBH732 REVISED EDITION-C Issued: Mar. 2016. No. OBH732 REVISED EDITION-B Issued: Nov.

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