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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-GS30NA
MSZ-GS36NA
MSY-GS30NA
MSY-GS36NA
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U1
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U1
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U1
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U1
Outdoor unit service manual
MUZ-GS•NA/NAH, MUY-GS•NA Series (OBH875)
CONTENTS
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················ 11
9. TROUBLESHOOTING ······························· 18
10. DISASSEMBLY INSTRUCTIONS ················· 30
PARTS CATALOG (OBB874)
No. OBH874
2
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Table of Contents
Related Manuals for Mitsubishi Electric MSZ-GS30NA-U1
Summary of Contents for Mitsubishi Electric MSZ-GS30NA-U1
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Page 1: Table Of Contents
INDOOR UNIT No. OBH874 SERVICE MANUAL Models MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Outdoor unit service manual MUZ-GS•NA/NAH, MUY-GS•NA Series (OBH875) CONTENTS 1. TECHNICAL CHANGES · ······························· 2. PART NAMES AND FUNCTIONS ··················3 3. SPECIFICATION ········································4 4. OUTLINES AND DIMENSIONS ·····················6 5. WIRING DIAGRAM ·····································7 6. -
Page 2: Technical Changes
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-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Air cleaning fi lter (Anti-Allergy Enzyme Filter) Front panel Air fi lter (Nano platinum filter) Air inlet Emergency operation switch Air outlet Operation indicator Horizontal vane lamp Remote control Remote controller receiving section ACCESSORIES MSZ-GS30NA MSZ-GS36NA... -
Page 4: Specification
SPECIFICATION Model MSZ-GS30NA MSY-GS30NA MSZ-GS36NA MSY-GS36NA Power supply V, phase, Hz 208/230 , 1 , 60 Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.76 COOL Dry 374 - 602 - 699 - 915 Airflow (Wet) (336 - 542 - 629 - 823) Low - Med. - Page 5 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 —...
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Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Unit : inch Indoor unit 2-11/16 4-11/16 45-1/2 2-3/16 20-7/8 17-11/16 5-3/8 11-5/8 Wall hole ø3 Air in 46-1/16 Installation plate Piping Drain hose 2-15/16 33-11/16 9-1/2 2-5/8 Air out 5-7/8 2-5/16 Wireless remote controller Required Space (Indoor Unit) 4-11/16 or more 8-11/16 or more... -
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA OBH874... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Unit : inch Refrigerant pipe ø5/8 (with heat insulator) Indoor Indoor coil heat thermistor exchanger RT12 (Main) Flared connection Indoor coil Distributor thermistor RT13 (Sub) Room temperature thermistor RT11 Flared connection Refrigerant flow in cooling Refrigerant pipe ø1/4 (with heat insulator) Refrigerant flow in heating... -
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) Set time : 1-minute 1-second Set time : 3-minute... - Page 10 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 shutoff of the main power.
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Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA WIRELESS REMOTE CONTROLLER These pictures show MSZ type. Signal transmitting section Distance of signal : About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. Operation display section Battery replacement indicator VANE control button FAN speed control button... - Page 12 8-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) 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 13 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 79°F (26°C) or more 75°F (24°C) COOL mode of "I FEEL CONTROL" 77°F (25°C) to 79°F (26°C) Initial room temperature minus 4°F (2°C) DRY mode of "I FEEL More than 55°F (13°C), Initial room temperature minus 4°F (2°C)
- Page 14 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 15 2. Vertical vane (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. SWING (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper.
- Page 16 8-8. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK button. How to set the current time (a) Press the CLOCK button.
- Page 17 8-9. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use the emergency operation switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote control- ler run down.
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Page 18: Troubleshooting
TROUBLESHOOTING MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA 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 19 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. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
- Page 20 2. Indoor unit failure mode table Left lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lighted Normal — — The room temperature thermistor short or open 1-time blink every Room temperature Refer to the characteristics of the room temperature circuit is detected every 8 seconds during op- 0.5-second thermistor...
- Page 21 9-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixied in the refrigerant circuit. First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the refrigerant circuit, or no blockage points (e.g.
- Page 22 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 blinks. Lighted OPERATION INDICATOR Blinking...
- Page 23 9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Part name Check method and criterion Figure Room temperature therm- Measure the resistance with a tester. istor (RT11) Indoor coil thermistor Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C. (RT12 (MAIN), RT13 board", the chart of thermistor.
- Page 24 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor 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 the emergency operation switch.
- Page 25 B Check of remote controller and receiver P.C. board Check if the remote controller is exclusive for this air conditioner. Switch ON the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 9-1.4.) visible? (Not clear) Remove the batteries, then set them back and press RESET button.
- Page 26 C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance between Short circuit: CN211 of the indoor fan motor and vane motor connector CN151 from the Replace the indoor fan motor.
- Page 27 D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage AC in Check the power supply. the power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
- Page 28 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., or is the indoor unit, and/or the antennas and the the distance between the antennas and outdoor unit.
- Page 29 9-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA Indoor electronic control P.C. board, switch P.C. board, display P.C. board, power monitor receiver P.C. board Connector to Indoor fan motor (CN211) (+)0 or 15 V DC (+)3-6 V DC Indoor electronic control P.C.
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Page 30: 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 31 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 3. Removing the nozzle assembly (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical cover. (Refer to section 2.) (3) Remove the electrical side cover, disconnect the vane Screw of electrical motor connector.
- Page 32 Screw of the line flow fan HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Published: Jan. 2021. No. OBH874 Made in Japan Specifications subject to change without notice.