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Mitsubishi Electric MUZ-GS30NA Service Manual
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Mitsubishi Electric MUZ-GS30NA Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-GS30NA
MUZ-GS36NA
MUY-GS30NA
MUY-GS36NA
HFC
utilized
R410A
MUZ-GS30NAH
-
U1
MUZ-GS36NAH
-
U1
-
U1
-
U1
Indoor unit service manual
MSZ-GS•NA, MSY-GS•NA Series (OBH874)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. DATA······················································ 11
8. ACTUATOR CONTROL ····························· 18
9. SERVICE FUNCTIONS ······························ 19
10. TROUBLESHOOTING ······························· 20
11. DISASSEMBLY INSTRUCTIONS ················· 40
PARTS CATALOG (OBB875)
Revision A:
• A warning when opening or closing the
valve has been added.
OBH875 is void.
No. OBH875
REVISED EDITION-A
-
U1
-
U1

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  • Page 1: Table Of Contents

    • A warning when opening or closing the valve has been added. OBH875 is void. OUTDOOR UNIT No. OBH875 utilized REVISED EDITION-A SERVICE MANUAL R410A Models MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Indoor unit service manual MSZ-GS•NA, MSY-GS•NA Series (OBH874) CONTENTS 1. TECHNICAL CHANGES ······························2 2.

  • Page 2: Technical Changes

    Revision A: • A warning when opening or closing the valve has been added. TECHNICAL CHANGES MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 1. New model...

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OBH875A...

  • Page 4: Specification

    SPECIFICATION MUZ-GS30NA MUZ-GS36NA Outdoor unit model MUZ-GS30NAH MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 30,700 32,000/33,200 Btu/h Cooling *1 (10,300 ~ 30,700) (10,300 ~ 32,000)/(10,300 ~ 33,200) Capacity Rated (Minimum~Maximum) 32,600 35,200 Heating 47 *1,3 Btu/h (9,800 ~ 34,000) (9,800 ~ 36,000) Capacity Btu/h...
  • Page 5 Test condition *4, *5 Indoor air condition (°F) Outdoor air condition (°F) Mode Test AHRI Dry bulb Wet bulb Dry bulb Wet bulb 210/240 "A-Full" Cooling Steady State (75) at rated compressor speed "B-Full" Cooling Steady State (65) at rated compressor speed SEER "B-Low"...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Unit: inch REQUIRED SPACE 14 in OR MORE. 4 in OR MORE. 16-7/16 AIR IN ↓ DRAIN HOLE ø1-21/32 → 20 in OR MORE. AIR IN OPEN TWO SIDES OF RIGHT 4 in OR MORE.

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MUZ-GS30NA MUZ-GS36NA MUZ-GS30NAH MUZ-GS36NAH OBH875A...
  • Page 8 MUY-GS30NA MUY-GS36NA OBH875A...

  • Page 9: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Unit: inch (mm) Service port (high pressure) Refrigerant pipe ø 5/8 Muffler 4-way valve (with heat insulator) Strainer #100 Stop valve Outdoor Flared connection Discharge heat Ambient (Only GS30/36NAH) temperature exchanger...
  • Page 10 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Max. Height difference Model Max. Length Liquid MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.

  • Page 11: Data

    DATA MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Outdoor intake air DB temperature (˚F) Indoor air Model IWB (˚F) 37.6 22.1 0.59 2.95 35.2 20.6 0.59 3.24 33.0 19.4 0.59 3.49 MUZ-GS30NA MUZ-GS30NAH 35.6 25.6 0.72...
  • Page 12 Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA (208V) SHF at rating condition = 0.69 SHF at rating condition = 0.72 = 823 CFM = 823 CFM...
  • Page 13 This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. Heating Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-GS30NA MUZ-GS30NAH Airflow = 803 CFM Airflow = 803 CFM Outdoor intake air WB temperature (°F)
  • Page 14 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA (PSIG) (PSIG) (°F) (°F) 95 100 105 110 115 95 100 105 110 115...
  • Page 15 Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. MUZ-GS30NA MUZ-GS30NAH (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GS36NA MUZ-GS36NAH...
  • Page 16 Rated frequency MSZ-GS30NA MSZ-GS36NA Indoor unit MSY-GS30NA MSY-GS36NA 208/230, Power supply phase, Cooling: 0.078 Input Heating: 0.055 Cooling: 0.70/0.63 Fan motor current Heating: 0.52/0.47 MUZ-GS30NA MUZ-GS36NA Outdoor unit MUZ-GS30NAH MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 208/230, Power supply phase, Input 3.242 3.285 3.552/3.692 3.685 Comp.
  • Page 17 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor...

  • Page 18: Actuator Control

    ACTUATOR CONTROL MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

  • Page 19: Service Functions

    SERVICE FUNCTIONS MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Defrost finish temperature...

  • Page 20: Troubleshooting

    TROUBLESHOOTING MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA 10-1. 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, then after con- firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 21 10-2. 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 (10-3.) disappears, the memorized failure details can be recalled. 1.
  • Page 22 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 1.
  • Page 23 NOTE: Blinking patterns of this mode differ from the ones 3. Table of outdoor unit failure mode recall function of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR...
  • Page 24 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp...
  • Page 25 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor.
  • Page 26 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Frequency drop by Current from power outlet is nearing breaker capacity. The unit is normal, but check the operates. 2.5 seconds OFF current protection following. • Check if indoor filters are clogged. •...
  • Page 27 10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. Fin temperature board”, for the chart of thermistor.
  • Page 28 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 10-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 10-5.
  • Page 29 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT *Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
  • Page 30 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 10-6.1.) board.
  • Page 31 H Check of R.V. coil MUZ-GS30/36 * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. * In case CN602 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
  • Page 32 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
  • Page 33 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Rectify indoor/outdoor Turn ON power supply and press the emergency operation switch. connecting wire. Does the left lamp of the Is there voltage 208/230 V AC Replace the indoor electronic control P.C.
  • Page 34 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> MSZ type While pressing both Operation select button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds.
  • Page 35 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
  • Page 36 M 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 37 N Check of defrost heater MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4.
  • Page 38 P 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. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
  • Page 39 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA Back side of unit Smoothing Smoothing Smoothing Fuse (F880) Output to drive Heater (CN601) Capacitor Capacitor Capacitor T3.15AL250V outdoor fan motor 208/230 V AC...

  • Page 40: Disassembly Instructions

    Locking lever lever. Connector 11-1. MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS30NAH : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 41 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Screws of the conduit cover Photo 3 board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 42 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 Connection procedure when attaching the inverter P.C. board (Photo 8, 9) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C. board to each hooks on the heat sink support as shown Photo 8.
  • Page 43 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 10 Outdoor heat exchanger defrost thermistor, outdoor heat exchanger tempera- temperature thermistor ture thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 44 Brazed parts of 4-way valve HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021. No. OBH875 REVISED EDITION-A Published: Jan. 2021. No. OBH875 Specifications are subject to change without notice.

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