Revision A: • MSZ-GL06/09/12/15NA- U1 and MSYGL09/12/15NA- U1 have been added. Please void OBH732. INDOOR UNIT No. OBH732 SERVICE MANUAL REVISED EDITION-A Models MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSZ-GL18NA MSZ-GL24NA - U1 U1 U1 U1 U1 MSY-GL09NA MSY-GL12NA MSY-GL15NA MSY-GL18NA MSY-GL24NA - U1 U1 U1 U1 U1 U1 Outdoor unit service manual MUZ-GL•NA, MUY-GL•NA Series (OBH733) MXZ-C•NA, MXZ-C•NAHZ Series (OCH573) CONTENTS MSZ-GL18NA MSY-GL18NA 1.
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.
2 PART NAMES AND FUNCTIONS MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA Air filter (Nano platinum filter) Front panel Air cleaning filter (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 Installation plate Attachment screws for the installation plate 4 × 25 mm Remote controller holder Screws for 3.
MSZ-GL18NA MSY-GL18NA Air inlet Front panel Air filter (Nano platinum filter) Air cleaning filter (Anti-Allergy Enzyme Filter) Heat exchanger 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 × 25 mm Remote controller holder Fixing screw for 3.
MSZ-GL24NA MSY-GL24NA Front panel Air filter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter) Air inlet Air outlet Remote controller Horizontal vane Heat exchanger Display section Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES Installation plate Installation plate fixing screw 4 × 25 mm Remote controller holder Fixing screw for 3.
3 SPECIFICATION MSZ-GL09NA MSY-GL09NA MSZ-GL06NA Indoor model Power supply V, phase, Hz Max. fuse size (time delay)/ Disconnect switch A Min. circuit ampacity A Fan motor F.L.A 208/230, 1, 60 15 1.0 0.76 399 - 321 - 237 - 170 - 145 (364 - 286 - 201 - 134 - 109) COOL Dry Airflow CFM (Wet) Super High - High - Med. Low - Quiet HEAT Dry CFM Moisture removal pt./h Cooling Sound level Super High - High - Med. Heating Low - Quiet (MSZ) Cooling Fan speed Super High - High - Med.
3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage 208/230 V 1 phase 60 Hz Indoor unit Guaranteed voltage (V) Min. 187 208 230 Max. 253 (2) OPERATION Mode Condition DB 80 90 67 Standard temperature Maximum temperature Cooling Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature Minimum temperature 70 80 70 Indoor 78% Intake air temperature (°F) WB 67 73 57 DB 95 115 14 60 67 60 47 75 -4 Outdoor — WB — — — 43 65 -5 3-2.
4 OUTLINES AND DIMENSIONS Piping MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA Unit: inch Insulation Liquid line Gas line ø1 - 3/8 O.D ø1/4 19 - 11/16 (Flared connection ø1/4) ø3/8 16 - 15/16 (Flared connection: ø3/8 (GL06/09/12NA), ø1/2 (GL15NA)) Insulation ø1-1/8 O.D Connected part ø5/8 O.
MSZ-GL24NA MSY-GL24NA OBH732A Unit: inch 9
5 WIRING DIAGRAM MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA MSZ-GL18NA MSY-GL18NA OBH732A 10
MSZ-GL24NA MSY-GL24NA OBH732A 11
6 REFRIGERANT SYSTEM DIAGRAM MSZ-GL06NA MSZ-GL09NA MSZ-GL12NA MSZ-GL15NA MSY-GL09NA MSY-GL12NA MSY-GL15NA Unit: inch (mm) 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 thermistor RT12 (main) Indoor heat exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1/4 (ø6.
7 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.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute.
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. After the power is restored, the unit restarts automatically according to the memory.
8 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-GL24NA MSY-GL24NA Signal transmitting section Operation display section VANE CONTROL button (Horizontal vane button) STOP/OPERATE (OFF/ON) button FAN SPEED CONTROL button OPERATION SELECT button TEMPERATURE buttons OFF TIMER button ECONO COOL button ON TIMER button WIDE VANE button (Vertical vane button) TIME SET buttons FORWARD button BACKWARD button POWERFUL button CLOCK SET button RESET button Indication of remote controller model is on back NOTE: Last setting will be stored after the
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). 1. Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.
(4) The initial set temperature is decided by the initial room temperature. Initial room temperature 79°F (26°C) or more 77 to 79°F (25 to 26°C) Less than 79°F (25°C) Model Initial set temperature COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" 75°F (24°C) Initial room temperature minus 4°F (2°C) Initial room temperature minus 4°F (2°C) (5) TEMPERATURE buttons ) mode, set temperature is decided by the microprocessor based on the room temperature.
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. (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper.
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.
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. The unit turns OFF at 11:00 PM, and ON at 6:00 AM. (Example 2) The current time is 11:00 AM. The unit turns ON at 5:00 PM, and OFF at 9:00 PM.
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) controller running down. The unit will start and OPERATION Set temperature 75°F(24°C) 75°F(24°C) INDICATOR lamp will light up. Fan speed Med. Med.
9 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.
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 1.
2. Indoor unit failure mode table Upper lamp of OPAbnormal point ERATION INDICA(Failure mode) TOR lamp Not lighted Normal Condition Remedy — The room temperature thermistor short or 1-time flash every Room temperature open circuit is detected every 8 seconds dur0.5-second thermistor ing operation. Indoor coil The indoor coil thermistor short or open circuit 2-time flash is detected every 8 seconds during operation. 2.
9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Outdoor unit does not operate. Outdoor unit operates only in Test Run operation. Check room temperature thermistor. Refer to 9-7. "Test point diagram and voltage". Outdoor unit does not operate even in Test Run operation. Refer to "How to check inverter/compressor". Indoor unit operates. Outdoor unit does not operate normally. Indoor unit does not receive the signal from remote controller.
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 Not lighted No.
OPERATION INDICATOR No. Abnormal point Operation indicator lamp Symptom Condition Remedy Upper lamp lights and lower lamp flashes. 1 MXZ type Operation mode setting The operation mode of the each indoor unit Outdoor unit is differently set to COOL (includes DRY) and • Unify the operation mode. operates but HEAT at the same time, the operation mode Refer to outdoor unit service indoor unit does of the indoor unit that has operated at first has manual. not operate. the priority. 2.
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. Is there any foreign matter that interferes the rotation of the line flow fan? No Yes Remove the foreign matter and adjust the line flow fan. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
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. Is there any foreign matter that interferes the rotation of the line flow fan? Yes Remove the foreign matter and adjust the line flow fan. Is there 294/325 VDC between CN211 (+) and (–) ? No Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
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) button on the remote controller. Is LCD display on the remote controller visible? Yes No (Not clear) 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.
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 motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch? No Yes Measure the resistance of indoor fan motor. (Refer to 9-6 .
MSZ-GL18NA MSY-GL18NA Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch? No Yes Measure the resistance of indoor fan motor. (Refer to 9-6.) Short/ open circuit: Replace the indoor fan motor.
MSZ-GL24NA MSY-GL24NA Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connectors CN151 and CN152 from the indoor electronic control P.C. board and turn ON the power supply. Short/ open circuit: Replace the indoor fan motor. Measure the resistance between CN211 and of the indoor fan motor connector.
D How to check miswiring and serial signal error MSZ-GL06/09/12/15NA MSY-GL09/12/15NA Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Yes Is there rated voltage between outdoor terminal block S1 and S2? No Check the wiring. Press EMERGENCY OPERATION switch once.
MSZ-GL18/24NA MSY-GL18/24NA Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. No Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? Yes Is serial signal error indicated 6 minutes later? Yes A Turn OFF the power supply.
E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Yes Is the distance between the antennas and the indoor unit within 9.91 ft.(3 m), or is the distance between the antennas and the outdoor unit within 9.91 ft.(3 m)? Ground the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
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 Fuse (F11)( ) Indoor power P.C. board Varistor (NR11) Resistor (R111) Indoor fan motor (CN211) (+)0-6 V (+)3-6 VDC 15 VDC (–) GND (highvoltage DC) 294/325 VDC Terminal block Connector to indoor electronic control P.C. board (CN20A) GND 5 VDC 12 VDC Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
MSZ-GL18NA MSY-GL18NA 3. Indoor power P.C. board 12 VDC Connector to indoor electronic control P.C. board (CN20A) 5 VDC 12V 5V Connector to Terminal block (CN201) GND Fuse (F11) T3.15AL250V Varistor (NR11) GND Connector to Indoor fan motor (CN211) 294/325 VDC (-) GND (High voltage DC) 15 VDC Resistor (R111) (+)0 or 15 VDC (+)3-6 VDC 4. Indoor electronic control P.C. board Room temperature thermistor RT11 (CN111) Timer short mode point (Refer to 7-1.
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 Terminal Fuse (F11)( ) block Varistor (NR11) To disable "Auto restart function" cut the Jumper wire to 12 VDC JR77. (Refer to 7-3.) Resistor (R111) Indoor coil thermistor RT12, RT13 (CN112) Room temperature thermistor RT11 (CN111) Power monitor receiver SW P.C.
10 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. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism.
OPERATING PROCEDURE PHOTOS Photo 2 2. Removing the indoor electronic control P.C. 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. clamp. (3) Loosen the screw of the indoor/outdoor connecting wire and remove the indoor/outdoor connecting wire. (4) Remove the screw of the electrical cover and the electrical cover. (5) Open the indoor electronic control P.C.
OPERATING PROCEDURE PHOTOS Photo 5 4. Removing the nozzle assembly (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 holder. (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. 5. Removing the horizontal vane motor (1) Remove the nozzle assembly. (Refer to 5.) (2) Remove the screws of the horizontal vane motor unit.
OPERATING PROCEDURE PHOTOS Photo 6 6. Removing the indoor fan motor, the indoor coil 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 holder, the electrical box and the nozzle assembly. (3) Remove the screws fixing the motor bed. (4) Loosen the screw fixing the line flow fan. (5) Remove the motor bed together with fan motor and motor band. (6) Release the hooks of the motor band. Remove the motor band.
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 screws of the panel. (2) Pull the panel slightly toward you, and then remove the panel by pushing it upward.
OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the electrical box Photo 2 (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Disconnect the following connectors: CN151 (Vane motor) CN112 (Indoor coil thermistor) CN10A (To the indoor power P.C. board) Screws of the ground plate Water cover Screw of the electrical cover Screw of the V.A. clamp (3) Unhook the catch on the left side of the control P.C. board holder.
OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. board Photo 5 Control P.C. board holder (Inside) (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Disconnect the following connectors: CN151 (Vane motor) CN112 (Indoor coil thermistor) CN10A (To the indoor power P.C. board) Catch Indoor electronic control P.C. board (3) Unhook the catch on the left side of the control P.C. board holder. Pull the control P.C.
OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil thermistor and the line flow fan Photo 7 (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly. (Refer to 2.) (3) Remove the screws fixing the motor bed. (4) Loosen the screw fixing the line flow fan. (5) Remove the motor bed together with the indoor fan motor and the motor band.
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. (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. Horizontal vanes 2. Removing the indoor electronic control P.C. board, the power monitor receiver SW P.C.
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. board: CN151 (Horizontal vane motor) CN152 (Vertical vane motor) (5) Remove the power monitor receiver holder.
OPERATING PROCEDURE PHOTOS Photo 8 7. Removing the water cut, the indoor fan motor, 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 electrical box and the nozzle assembly. (Refer to 2 - 4.) (3) Remove the screw of the water cut and remove the water cut. (4) Remove the screws fixing the motor bed. (5) Loosen the screw fixing the line flow fan.
Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. Clip shape When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the lead wire should point down. Holder shape About the same length Position and procedure for mounting the clip-shape part 1. Set the indoor coil thermistor in the center of the clip-shape part. 2. Check the (marked) mounting position. 3. Mount the clip-shape part.
