Mitsubishi Mr.Slim MUY-GE09NA Service Manual
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Mitsubishi Mr.Slim MUY-GE09NA Service Manual

Outdoor unit split-type air conditioners
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SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models
MUZ-GE09NA
MUZ-GE15NA
MUY-GE09NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
Indoor unit service manual
MSZ-GE•NA MSY-GE•NA Series (OBH548)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM ············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············11
7. DATA ································································ 13
8. ACTUATOR CONTROL ··································· 22
9. SERVICE FUNCTIONS ··································· 23
10. TROUBLESHOOTING ····································· 23
11. DISASSEMBLY INSTRUCTIONS ···················· 40
PARTS CATALOG (OBB549)
No. OBH549
TM

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Summary of Contents for Mitsubishi Mr.Slim MUY-GE09NA

  • Page 1: Table Of Contents

    SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL Models MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA NOTE: RoHS compliant products have <G> mark on the spec name plate. No. OBH549 utilized R410A Indoor unit service manual MSZ-GE•NA MSY-GE•NA Series (OBH548) CONTENTS 1.

  • Page 2: Muz-Ge12Na

    TECHNICAL CHANGES MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA 1. New model...

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUZ-GE18NA MUY-GE18NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet Air inlet (back and side) Piping Drain hose Air outlet Drain outlet...

  • Page 4: Specification

    1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB MUZ-GE09NA MUY-GE09NA 9,000 Btu/h ( 3,800 ~ 12,200 ) ( 3,800 ~ 12,200 )
  • Page 5 Outdoor unit model Cooling 1 Capacity Rated (Minimum~Maximum) Heating 47 1 Capacity Heating 17 2 Cooling 1 Power consumption Rated (Minimum~Maximum) Heating 47 1 Power consumption Heating 17 2 [SEER] 3 Cooling HSPF IV 4 Heating Heating 1 Power supply Max.
  • Page 6 Test condition 3, 4 Mode Test "A-2" Cooling Steady State at rated compressor Speed "B-2" Cooling Steady State at rated compressor Speed SEER "B-1" Cooling Steady State (Cooling) at minimum compressor Speed "F-1" Cooling Steady State at minimum compressor Speed "E-V"...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA 15-3/4 Drain hole Air in Air in Air out handle 11-29/32 5-15/16 19-11/16 31-1/2 MUZ-GE18NA MUY-GE18NA 20-9/32 Drain 3 holes 11-25/32 (ø1-5/16) Air in 2-19/32 Air in Air out 19-11/16 33-1/16...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MUZ-GE09NA MUZ-GE12NA MUY-GE09NA MUY-GE12NA...
  • Page 9 MUZ-GE15NA MUY-GE15NA...
  • Page 10 MUZ-GE18NA MUY-GE18NA...

  • Page 11: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-GE09NA MUY-GE09NA Refrigerant pipe ø3/8 (with heat insulator) Stop valve (with service port) Flared connection Flared connection Refrigerant pipe ø1/4 (with heat insulator) MUZ-GE12NA MUZ-GE15NA MUY-GE12NA MUY-GE15NA Refrigerant pipe ø3/8 (GE12NA) Refrigerant pipe ø1/2 (GE15NA) (with heat insulator)
  • Page 12 MUZ-GE18NA MUY-GE18NA Refrigerant pipe ø 1/2 (with heat insulator) Flared connection Flared connection Refrigerant pipe ø 1/4 (with heat insulator) MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Max. Length MUZ-GE09/12/15NA MUY-GE09/12/15NA MUZ-GE18NA MUY-GE18NA Indoor unit Max. Height difference Muffler #100 4-way valve...

  • Page 13: Data

    3 lb. 7 oz. MUY-GE18NA NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. DATA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUY-GE09NA MUY-GE12VA MUY-GE15VA MUY-GE18VA Indoor air Model IWB (˚F) 11.0 MUZ-GE09NA 10.4 MUY-GE09NA 14.7...
  • Page 14 How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2. The compressor starts with operational frequency.
  • Page 15 MUZ-GE18NA MUY-GE18NA SHF at rating condition = 0.71 Airflow = 498 CFM Outdoor intake air DB temperature (°F) Heating (MUZ) MUZ-GE09NA = 413 CFM Airflow Outdoor intake air WB temperature (°F) 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.
  • Page 16 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-GE09NA MUY-GE09NA (PSIG) 68 70 Outdoor ambient temperature MUZ-GE12NA MUY-GE12NA (PSIG) 68 70 Outdoor ambient temperature MUZ-GE15NA MUY-GE15NA...
  • Page 17 MUZ-GE18NA MUY-GE18NA (PSIG) 68 70 Outdoor ambient temperature Heating (MUZ) Data is based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data is for heating operation without any frost. MUZ-GE09NA (PSIG) Outdoor ambient temperature MUZ-GE12NA (PSIG) Outdoor ambient temperature...
  • Page 18 MUZ-GE15NA (PSIG) Outdoor ambient temperature MUZ-GE18NA (PSIG) Outdoor ambient temperature (PSIG) 54Hz 75 (°F) Outdoor ambient temperature (PSIG) 58Hz 75 (°F) Outdoor ambient temperature 54Hz 75 (°F) 58Hz 75 (°F)
  • Page 19 Cooling Heating Btu/h 9,000 10,900 0.82 — 0.660 0.760 59.5 77.5 MSZ-GE09NA, MSY-GE09NA 0.022 0.023 0.24/0.22 0.25/0.23 MUZ-GE09NA MUZ-GE09NA MUY-GE09NA 0.638 0.737 3.32/3.00 3.66/3.31 0.27/0.24 0.30/0.27 PSIG PSIG °F °F °F °F 1 lb. 12 oz. °F °F °F °F —...
  • Page 20 Model Item Capacity Input Rated frequency Indoor unit Power supply (V, Phase, Hz) Input Fan motor current Outdoor unit Power supply (V, phase, Hz) Input Comp. current Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Comp.
  • Page 21 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-GE09NA MUY-GE09NA Correction of Cooling capacity Correction of Cooling total input (Hz) The operational frequency of compressor The operational frequency of compressor MUZ-GE12NA MUY-GE12NA Correction of Cooling capacity Correction of Cooling total input...

  • Page 22: Actuator Control

    ACTUATOR CONTROL MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA 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 23: Service Functions

    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 24: Failure Mode Recall Function

    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.
  • Page 25 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi rm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77°F (25°C).
  • Page 26 3. Outdoor unit failure mode table POWER lamp Abnormal point (Indoor unit) (Failure mode / protection) None (Normal) 2-time fl ash Outdoor power system 2.5 seconds 3-time fl ash Discharge temperature 2.5 seconds thermistor Defrost thermistor (MUZ) Fin temperature thermistor P.C.

  • Page 27: Troubleshooting Check Table

    10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ No. Symptom LED indication Condition Outdoor 1-time fl ash every Outdoor power sys- unit does 2.5 seconds not oper- ate. Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, de- Outdoor control sys- 6-time fl ash Serial signal 2.5 seconds OFF 11-time fl...
  • Page 28 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA Part name Defrost thermistor (RT61) (MUZ) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
  • Page 29 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. Are the voltages balanced? Check the compressor. B Check of open phase ● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals.
  • Page 30 D Check of compressor winding ● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance be- tween 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 31 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 10-6.1.) Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? (Cause is poor contact.)
  • Page 32 I Check of outdoor fan motor MUZ-GE09/12/15NA MUY-GE09/12/15NA Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to 10-4.) Replace the inverter P.C. board. MUZ-GE18NA MUY-GE18NA Check the connection between the connector CN931 and CN932.
  • Page 33 J Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Does The upper lamp of OPERATION INDICATOR lamp on the indoor unit light up? Is there bus-bar voltage 260-325 VDC between DB61 (+) and DB61 ( –) on the inverter P.C.
  • Page 34 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 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 Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal. (Refer to "TEST POINT DIAGRAM AND VOLTAGE" in this manual.) Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3 Turn OFF the power supply.
  • Page 37 3. Channel, frequency, broadcast station unaffected by the electromagnetic noise 4. Layout of: indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver 5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise 6.
  • Page 38 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA Bus-bar voltage DB61 Back side of unit DC 260-325 V AC 208/230 V Fuse (F901) T3.15 AL 250 V Output to drive compressor (LDU,...
  • Page 39 MUZ-GE18NA MUY-GE18NA Bus-bar voltage DB61 Back side of unit DC 260-325 V AC 208/230 V Fuse (F901) T3.15 AL 250 V Output to drive compressor (LDU, LDV, LDW) Front side of unit Defrost thermistor(RT61) (MUZ) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) Temperature(°F) Smoothing Smoothing...

  • Page 40: Disassembly Instructions

    (1) Slide the sleeve and check if there is a locking lever or not. Sleeve Locking lever 11-1. MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screw fixing the service panel. (2) Pull down the service panel and remove it.
  • Page 41 OPERATING PROCEDURE 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) CN931, CN932 (Fan motor) CN641 (Defrost thermistor (MUZ) and discharge tempera- ture thermistor) CN643 (Ambient temperature thermistor)
  • Page 42 OPERATING PROCEDURE 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller. (Photo 7) (5) Remove the screws fixing the fan motor.
  • Page 43 11-2. MUZ-GE18NA MUY-GE18NA OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover.
  • Page 44 OPERATING PROCEDURE 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C. board> CN721 (R.V.coil) (MUZ) CN931, CN932 (Fan motor) CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor)
  • Page 45 OPERATING PROCEDURE 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger tempera- ture thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 48 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CO.,LTD Distributed in Jul. 2009. No. OBH 549 5 Made in Japan New publication, effective Jul. 2009 Specifications subject to change without notice.

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