Mitsubishi Electric Mr.Slim MUZ-A09NA Service Manual

Outdoor unit

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SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-A09NA

MUZ-A12NA

MUZ-A15NA

MUZ-A17NA

MUZ-A24NA

MUY-A15NA

MUY-A17NA

MUY-A24NA

MUZ-GA24NA

MUY-GA24NA

MUZ-A09/12/15/17NA

MUY-A15/17NA

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the PARTS LIST

(RoHS compliant).

Revision E:

• MUZ-GA24NA and MUY-GA24NA have

been added.

Please void OB451 REVISED EDITION-D.

HFC

utilized

R410A

Indoor unit service manual

MSZ-A•NA Series (OB450)

MSZ-GA•NA Series (OB450)

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 6

3. SPECIFICATION ················································ 7

4. OUTLINES AND DIMENSIONS ·······················11

5. WIRING DIAGRAM ·········································· 12

6. REFRIGERANT SYSTEM DIAGRAM ············· 20

7. DATA ································································ 23

8. ACTUATOR CONTROL ··································· 37

9. SERVICE FUNCTIONS ··································· 38

10. TROUBLESHOOTING ····································· 38

11. DISASSEMBLY INSTRUCTIONS ···················· 65

12. PARTS LIST ····················································· 72

12-1. PARTS LIST ··········································· 72

12-2. RoHS PARTS LIST ································ 78

13. OPTIONAL PARTS ······················ BACK COVER

No. OB451

REVISED EDITION-E

Table of Contents

Troubleshooting

Need help?

Do you have a question about the Mr.Slim MUZ-A09NA and is the answer not in the manual?

Questions and answers

Ilene Perritt

April 27, 2025

Cannot turn off unit (muz-a12na). Remote works with other actions.

1 comments:

Mr. Anderson

May 14, 2025

To turn off the Mitsubishi Electric MUZ-A09NA unit when the remote works for other functions, press the EMERGENCY OPERATION switch on the indoor unit. This will override the current operation and stop the unit.

This answer is automatically generated

Summary of Contents for Mitsubishi Electric Mr.Slim MUZ-A09NA

Page 1: Table Of Contents
• MUZ-GA24NA and MUY-GA24NA have been added. Please void OB451 REVISED EDITION-D. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OB451 SERVICE MANUAL REVISED EDITION-E utilized R410A Models MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA Indoor unit service manual MSZ-A•NA Series (OB450) MUY-GA24NA MSZ-GA•NA Series (OB450)
Page 2 Revision A: • MUZ-A09NA - and MUZ-A09NA - have been added. Revision B: • 10-5. ”Check of outdoor thermistors” has been corrected. Revision C: • 10-6. ”Test point diagram and voltage” has been corrected. 10-6.3. ”Outdoor electronic control P.C. board”, the chart of thermistor has been corrected.
Page 3: Technical Changes
TECHNICAL CHANGES MUZ09UN → MUZ-A09NA MUZ12UN → MUZ-A12NA MUH15TN → MUZ-A15NA MUH17TN → MUZ-A17NA MUH24WN → MUZ-A24NA MU15TN → MUY-A15NA MU17TN → MUY-A17NA MU24WN → MUY-A24NA 1. Outdoor unit model has been changed. 2. Control method between indoor and outdoor unit has been changed.
Page 4 INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air condition- ers.
Page 5 Conversion chart of refrigerant temperature and pressure R410A (°F) 104 122 140 1. Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools. Can R22 tools R410A tools Description be used?
Page 6: Part Names And Functions
(for R410A) Charge hose (for R410A) Refrigerant gas cylinder for R410A with siphon Refrigerant (liquid) Electronic scale for refrigerant charging PART NAMES AND FUNCTIONS MUZ-A09NA MUZ-A15NA MUY-A15NA MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA MUZ-A12NA MUZ-A17NA MUY-A17NA Air inlet Air inlet (back and side)
Page 7: Specification
10.3 [17.0] HSPF IV(V) 4 Heating 8.2 (7.1) 8.2 (7.1) Heating 1 3.71 3.44 MUZ-A09NA MUZ-A09NA - Outdoor unit model MUZ-A12NA MUZ-A09NA - MUZ-A09NA - Power supply V , phase , Hz 208/230, 1, 60 Max. fuse size (time delay) Min.
Page 8 Item Model MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA 15,000 15,000 16,200 16,200 Cooling 1 Btu/h Capacity (3,100-15,000) (3,100-15,000) (3,100-16,200) (3,100-16,200) Rated 18,000 20,100 (Minimum-Maximum) Heating 47 1 Btu/h – – (3,400-20,900) (3,400-20,900) Capacity Rated Heating 17 2 Btu/h 13,000 – 13,000 – Cooling 1 1,690 (210-1,690) 1,690 (210-1,690) 2,070 (210-2,070) 2,070 (210-2,070) Power consumption...
Page 9 Item Model MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA 22,000 22,000 22,000 22,000 Cooling 1 Btu/h (4,400-22,000) (4,400-22,000) (4,400-22,000) (4,400-22,000) Capacity Rated Minimum-Maximum) 23,200 23,200 Heating 47 1 Btu/h — — (3,600-24,400) (3,600-24,400) Capacity Rated Heating 17 2 Btu/h 15,200 — 15,200 — Cooling 1 2,880 (290-2,880) 2,880 (290-2,880) 2,500 (270-2,500) 2,500 (270-2,500) Power consumption...
Page 10 Test condition 3, 4 Indoor air condition (˚F) Outdoor air condition (˚F) Mode Test Dry bulb Wet bulb Dry bulb Wet bulb "A" Cooling Steady State at rated compres- (75) sor Speed "B-2" Cooling Steady State at rated com- (65) pressor Speed SEER "B-1"...
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA Unit: inch REQUIRED SPACE Basically open 4 inch or more without any obstruction in front 15-3/4 Drain hole ø1-5/8 and on both sides of the unit. Air in Air in 1-9/16...
Page 12: Wiring Diagram
WIRING DIAGRAM MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA...
Page 13 MUY-A15NA MUY-A17NA...
Page 14 MUZ-A24NA MUZ-A24NA-...
Page 15 MUZ-A24NA- MUZ-A24NA-...
Page 16 MUY-A24NA...
Page 17 MUY-A24NA-...
Page 18 MUZ-GA24NA...
Page 19 MUY-GA24NA...
Page 20: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-A09NA MUZ-A09NA- MUZ-A12NA MUZ-A15NA MUZ-A17NA Unit: inch MUY-A15NA MUY-A17NA Refrigerant pipe ø3/8 (MUZ-A09/12) ø1/2 (MUZ-A15/17,MUY-A15/17) (with heat insulator) 4-way valve Muffler Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature Service thermistor port...
Page 21 MUZ-A24NA MUZ-GA24NA Unit: inch Muffler Refrigerant pipe ø5/8 #100 4-way valve (with heat insulator) Stop valve (with service port) Outdoor Flared connection Discharge heat Service Ambient temperature exchanger port temperature thermistor thermistor Defrost RT62 RT65 thermistor RT61 Service port Compressor Outdoor heat exchanger temperature...
Page 22 ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged MUZ-A09NA MUZ-A09NA - 2 lb. 5 oz. MUZ-A12NA MUZ-A09NA - 2 lb. MUZ-A09NA - 1.62 4.86...
Page 23: Data
DATA MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUZ-GA24NA MUY-A15NA MUY-A17NA MUY-A24NA MUY-GA24NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model (˚F) 11.0 0.61 10.3 0.67 0.72 0.76 0.79 MUZ-A09NA 10.4 0.58 0.64 0.69 0.73 0.77...
Page 24 0.84 10.6 0.88 11.0 0.89 12.4 0.93 MUZ-A09NA — — 0.62 0.74 0.82 10.9 0.86 11.2 0.88 12.7 0.91 MUZ-A09NA - 0.59 0.71 10.0 0.80 11.2 0.84 11.6 0.85 13.0 0.89 0.64 0.75 0.84 10.6 0.88 11.0 0.89 12.4 0.93 MUZ-A09NA - —...
Page 25: Performance Curve
7-2. PERFORMANCE CURVE Cooling MUZ-A09NA MUZ-A09NA MUZ-A12NA MUZ-A09NA MUZ-A09NA SHF at rating condition = 0.70 SHF at rating condition = 0.71 SHF at rating condition = 0.71 Airflow = 318 CFM = 275 CFM = 275 CFM Airflow Airflow Outdoor intake air DB temperature (°F) Outdoor intake air DB temperature (°F)
Page 26 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. 7-3. Condensing pressure Cooling Data is based on the condition of indoor humidity 50%. Air flow should be set to High speed. MUZ-A09NA MUZ-A09NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F)
Page 27 MUZ-A09NA MUZ-A09NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-A12NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-A15NA MUY-A15NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F)
Page 28 MUZ-A17NA MUY-A17NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-A24NA MUY-A24NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GA24NA MUY-GA24NA (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature...
Page 29 Heating 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-A09NA MUZ-A09NA (PSIG) (PSIG) 58Hz 58Hz 20 25 30 35 40 45 50 55 60 65 70 (°F)
Page 30 MUZ-A15NA (PSIG) (PSIG) 58Hz 58Hz 20 25 30 35 40 45 50 55 60 65 70 70(°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-A17NA (PSIG) (PSIG) 58Hz 58Hz 20 25 30 35 40 45 50 55 60 65 70 70(°F) (°F) Outdoor ambient temperature...
Page 31 MUZ-GA24NA (PSIG) (PSIG) 58Hz 58Hz 25 30 35 40 45 50 55 60 65 70(°F) 15 20 25 30 35 40 45 50 55 60 65 70(°F) Outdoor ambient temperature Outdoor ambient temperature...
Page 32 7-4. STANDARD OPERATION DATA Model MUZ-A09NA MSZ-A12NA Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 9,000 10,900 9,000 10,900 12,000 13,600 — 0.71 — 0.71 — 0.70 — Input 0.690 0.860 0.690 0.860 1,170 1,160 Rated frequency Indoor unit...
Page 33 MSZ-A15NA MSZ-A17NA Model MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 15,000 18,000 16,200 20,100 0.65 — 0.65 — Input 1.69 1.79 2.07 2.15 Rated frequency Indoor unit MSZ-A15NA, MSY-A15NA MSZ-A17NA, MSY-A17NA Power supply (V, Phase, Hz) 208 / 230, 1, 60 208 / 230, 1, 60 Input...
Page 34 MSZ-A24NA MSZ-GA24NA Model MSZ-A24NA MSZ-GA24NA MSY-A24NA MSY-GA24NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 22,000 23,200 22,000 23,200 0.63 — 0.63 — Input 2.88 2.35 2.50 2.14 Rated frequency Indoor unit MSZ-A24NA, MSY-A24NA MSZ-GA24NA, MSY-GA24NA Power supply (V, Phase, Hz) 208 / 230, 1, 60 Input 0.053...
Page 35 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-A09NA MUZ-A09NA - Correction of Heating total input Correction of Cooling total input Correction of Cooling capacity Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor...
Page 36 MUZ-A17NA MUY-A17NA MUZ-A17NA 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 The operational frequency of compressor The operational frequency of compressor MUZ-A24NA MUY-A24NA...
Page 37: Actuator Control
ACTUATOR CONTROL MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA 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 38: Service Functions
41 (5) None (Cut) 55 (13) 46 (8) TROUBLESHOOTING MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA 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.
Page 39: 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. 1.
Page 40 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 1.
Page 41 3. Outdoor unit failure mode table MUZ-A09/12/15/17NA MUY-A15/17NA Indoor/outdoor The left lamp of Outdoor unit Abnormal point LED indication unit failure OPERATION INDICATOR Condition Correspondence failure mode mode recall (Failure mode / protection) (Outdoor P.C. board) lamp (Indoor unit) recall function function None (Normal) —...
Page 42 MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA LED indication Indoor/outdoor The left lamp of (Outdoor P.C. board) Abnormal point unit failure OPERATION INDICATOR Condition Correspondence (Failure mode / protection) mode recall lamp (Indoor unit) LED1 LED2 function None (Normal) Lighting Lighting — — —...
Page 43: Troubleshooting Check Table
10-3. TROUBLESHOOTING CHECK TABLE MUZ-A09/12/15/17NA MUY-A15/17NA Symptom LED indication Abnormal point / Condition Condition Correspondence Outdoor unit 1-time ﬂ ash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compressor. does not oper- 2.5 seconds within 1 minute after the compressor gets started.
Page 44 MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA LED indication Abnormal point / Symptom Condition Correspondence Condition LED1(Red) LED2(Yellow) Outdoor unit Outdoor power system Overcurrent protection stop is continuously performed 3 times • Check the connection of the com- within 1 minute after the compressor gets started, or converter does not oper- pressor connecting wire.
Page 45 LED indication Abnormal point/ Con- Symptom Condition Correspondence dition LED1(Red) LED2(Yellow) Primary current pro- The input current exceeds 15 A. These symptoms do not mean any Outdoor unit tection abnormality of the product, but operates. Once Lighting check the following points. Secondary current pro- The current of the compressor exceeds 15 A.
Page 46 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA Part name Check method and criterion Figure Defrost thermistor (RT61) (MUZ) Fin temperature thermistor Measure the resistance with a tester. (RT64) Ambient temperature ther- Refer to 10-6.
Page 47: Troubleshooting Flow
10-5. Troubleshooting flow A How to check inverter/compressor MUZ-A09/12/15/17 MUY-A15/17 Disconnect the connector (CN61) between compressor and the intel- ligent power module (IPM). Check the voltage See 10-5. “Check of open phase” . between terminals. Is the voltage Check the resistance of the intelligent See 10-5.
Page 48 B Check of open phase MUZ-A09/12/15/17 MUY-A15/17 ● 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 balance of voltage between the terminals. Inverter P.C. board Output voltage is 50 - 130 V.
Page 49 F Check of compressor operation time MUZ-A09/12/15/17 MUY-A15/17 ● Connect the compressor and activate the inverter. Then measure <<Judgement>> the time until the inverter stops due to over current. 0 second Compressor starts <<Operation method>> Start heating or cooling operation by pressing EMERGENCY 1 second Abnormal OPERATION switch on the indoor unit.
Page 50 H Check of R.V. coil MUZ-A09/12/15/17 First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN721 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 51 MUZ-A24 MUZ-GA24 • Heating operation does not work. Disconnect the lead wire leading to the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 208/230 VAC between pin1 Turn off power supply of indoor and outdoor unit, and discon- and pin 2 at connector CN912? nect the connector CN781 in the outdoor electronic control P.C.
Page 52 I Check of outdoor fan motor MUZ-A09/12/15/17 MUY-A15/17 Rotate the outdoor fan Is the resistance slowly by hand, and measure Disconnect CN932 between each terminal the voltage of CN931 Turn ON the power from the inverter of outdoor fan motor (Measurement of feedback supply.
Page 53 J Check of power supply MUZ-A09/12/15/17 MUY-A15/17 Disconnect the connector (CN61) between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does the left lamp of OPERATION Is there voltage 208/230 VAC Replace the indoor INDICATOR lamp on the indoor unit between the indoor terminal...
Page 54 K Check of current-limiting resistor MUZ-A09/12/15/17 MUY-A15/17 When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Is the resistance of current- Turn ON the power limiting resistor (R64A or Does LED on the Replace the power P.C.
Page 55 L Check of LEV (Expansion valve) MUZ-A09/12/15/17 MUY-A15/17 This figures show about MSZ-A09/12/15/17. 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.
Page 56 M Check of inverter P.C. board MUZ-A09/12/15/17 MUY-A15/17 Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Inverter P.C. board Check the connection of the connectors. (Solder side) (CN931, CN932) of outdoor fan motor. CN931 If the connection is poor, correct it.
Page 57 N How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. • Check the wiring. Is there rated voltage between •...
Page 58 O 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 59 P Check of bus-bar voltage MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA •Check the voltage of power supply. •Conﬁ rm outdoor unit failure mode recall function. (Refer to 10-2.2) Conﬁ rm LED1 indication lamp on the outdoor electronic control P.C. board. Blink 5 times Blink 6 times Lighting Replace the outdoor elec-...
Page 60 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA Back side of unit 208/230V AC Smoothing capacitor Smoothing capacitor Smoothing capacitor DB61 DB61 (C63C) (C63B) (C63A) 280V - 370V LED monitor lamp Output to...
Page 61 2. Power P.C. board MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA Back side of unit Front side of unit Varistor Varistor Varistor (NR63) (NR62) (NR64) 208/230 VAC R.V.coil (CN721) 208/230 VAC Connecting wire with inverter P.C.board (CN726)
Page 62 3. Outdoor electronic control P.C. board MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Fin temperature thermistor (RT64) Discharge temperature thermistor (RT62) CN661 32 50 68 86 104 122 140 158 176 104 122 140 158 176 194 212 230 248 Temperature (°F) Temperature (°F)
Page 63 4. Noise filter P.C. board MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA CN901 To electronic CN902 CN903 control To power To power P.C. board board board 208/230 VAC 60Hz Input CN912 R.V. coil 208/230 VAC 60Hz Output 208/230 VAC 208/230 VAC 60Hz 60Hz Output Output F64 FUSE...
Page 64 5. Outdoor power board MUZ-A24NA MUY-A24NA Connect to the compressor Voltage among phases: 5 to 180 V 294-370 VDC Connect to the ground Output (Red) Connect to the controller board (–) (+)1-5(–): Signal transmission (To electronic control P.C. board) (White) 5 V DC pulse wave (+)2-5(–): Zero cross signal : Not used...
Page 65: Disassembly Instructions
Locking lever lever. Connector 11-1. MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. (Photo 1) (2) Pull down the service panel and remove it. (Photo 1) (3) Remove the screws fixing the conduit cover.
Page 66 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. Photo 3 Screws of the board and power P.C. board Screws of relay panel (1) Remove the top panel, cabinet and service panel. the ground (Refer to 1.) wires (2) Disconnect the power supply and indoor/outdoor con- necting wire and remove the back panel.
Page 67 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor con- necting wire and remove the back panel. (Refer to 1.) (3) Disconnect the connectors for outdoor fan motor.
Page 68 11-2. MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (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. Screw of the top panel (5) Remove the top panel.
Page 69 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. Photo 4 board and power board Screws of the power board assembly (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Disconnect the following connectors: <Electronic control P.C.
Page 70 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor (MUZ), dis- Photo 5 Discharge temperature thermistor charge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly.
Page 71 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 8 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit.
Page 72: Parts List
PARTS LIST 12-1. PARTS LIST (non-RoHS compliant) MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS...
Page 73 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MUZ- MUY- Part No. Part name in Wiring Remarks Diagram A09NA A12NA A15NA A17NA A15NA A17NA 1 E02 927 232 CABINET 2 E02 927 521 GRILLE 3 E02 927 501 PROPELLER 4 E02 927 290 BASE...
Page 74 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2. OUTDOOR UNIT ELECTRICAL PARTS...
Page 75 2. OUTDOOR UNIT ELECTRICAL PARTS Q'ty/unit Symbol MUZ- MUY- Part No. Part name in Wiring Remarks Diagram A09NA A12NA A15NA A17NA A15NA A17NA 1 E02 838 337 REACTOR 2 E02 A54 444 POWER P.C. BOARD 3 E02 A54 490 R.V. COIL 21S4 DEFROST, DISCHARGE 4 E02 927 306 THERMISTOR SET...
Page 76 MUZ-A24NA MUY-A24NA 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
Page 77 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part name in Wiring Remarks MUZ-A24NA MUY-A24NA Diagram 1 E02 819 297 TOP PANEL E02 A53 630 OUTDOOR HEAT EXCHANGER E02 A58 630 □□...
Page 78: Rohs Parts List
12-2. RoHS PARTS LIST (RoHS compliant) MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS...
Page 79 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MUZ-A MUY-A Part No. Part name in Wiring Remarks 09NA 12NA 15NA 17NA 15NA17NA Diagram G E12 927 232 CABINET 1 1 1 1 1 1 1 1 1 1 1 1 G E12 927 521 GRILLE 1 1 1 1 1 1 1 1 1 1 1 1...
Page 80 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2. OUTDOOR UNIT ELECTRICAL PARTS...
Page 81 2. OUTDOOR UNIT ELECTRICAL PARTS Q'ty/unit Symbol MUZ-A MUY-A Part No. Part name in Wiring Remarks 09NA 12NA 15NA 17NA 15NA17NA Diagram G E12 838 337 REACTOR 1 1 1 1 1 1 1 1 1 1 1 1 G E12 A54 444 POWER P.C. BOARD 1 1 1 1 1 1 1 1 1 1 1 1 G E12 A54 490 R.V.
Page 82 MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
Page 83 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MUZ- MUY- Part No. Part name in Wiring Remarks A24NA GA24NA A24NA Diagram 24NA G E12 819 297 TOP PANEL G E12 A53 630 G E12 A58 630 OUTDOOR HEAT EXCHANGER...
Page 84: Optional Parts
MUZ-GA24NA MUY-GA24NA HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2006 MITSUBISHI ELECTRIC CO.,LTD Distributed in Mar. 2009. No. OB451 REVISED EDITION-E 4 Distributed in May. 2008. No. OB451 REVISED EDITION-D 6 Distributed in Nov. 2007. No. OB451 REVISED EDITION-C 7 Distributed in Feb.

Mitsubishi Electric Mr.Slim MUZ-A09NA Service Manual

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