Service manual

ManualsBrandsMitsubishi ManualsAir ConditionerMr.Slim MSY-A15NA

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················5

3. SPECIFICATION·················································5

4. OUTLINES AND DIMENSIONS ·························9

5. WIRING DIAGRAM ··········································10

6. REFRIGERANT SYSTEM DIAGRAM··············14

7. DATA·································································17

8. ACTUATOR CONTROL····································30

9. SERVICE FUNCTIONS ····································31

10. TROUBLESHOOTING······································31

11. DISASSEMBLY INSTRUCTIONS·····················59

12. PARTS LIST······················································66

12-1. PARTS LIST·············································66

12-2. RoHS PARTS LIST··································72

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

Wireless type

Models

MUZ-A09NA MUZ-A09NA-

MUZ-A09NA- MUZ-A09NA-

MUZ-A12NA MUZ-A12NA-

MUZ-A15NA MUZ-A15NA-

MUZ-A17NA MUZ-A17NA-

MUZ-A24NA MUZ-A24NA-

MUY-A15NA

MUY-A17NA

MUY-A24NA

U21

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

OUTDOOR UNIT

Indoor unit service manual

MSZ-A•NA Series (OB450)

MUZ-A09NA MUY-A15NA

MUZ-A12NA MUY-A17NA

MUZ-A15NA

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).

HFC

utilized

R410A

No. OB451

REVISED EDITION-C

Revision C:

• 10-6.”Test point diagram and voltage” has

been corrected.

Please void OB451 REVISED EDITION-B.

OB451C--1.qxp 07.11.19 3:02 PM Page 1

Summary of content (78 pages)

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OB451C--1.qxp 07.11.19 3:02 PM Page 1 Revision C: • 10-6.”Test point diagram and voltage” has been corrected. Please void OB451 REVISED EDITION-B. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL No.
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OB451C--1.qxp 07.11.19 3:02 PM Page 2 Revision A: • MUZ-A09NA - 1 and MUZ-A09NA - U2 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. 1 TECHNICAL CHANGES MUZ09UN MUH15TN MUH24WN MU15TN MU24WN 1. 2. 3. 4. 5.
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OB451C--1.qxp 07.11.19 3:02 PM Page 3 Compressor New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the Raising position of the oil back hole enables to back the lower position oil back hole. refrigeration oil of the upper layer to flow back to the compressor.
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OB451C--1.qxp 07.11.19 3:02 PM Page 4 2.Refrigerant piping 1 Specifications Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications. Outside diameter(in) Wall thickness (in) Insulation material 1/4 0.0315 3/8 0.0315 Heat resisting foam plastic 1/2 0.0315 Specific gravity 0.045 Thickness 0.315 in 5/8 0.0394 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe.
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OB451C--1.qxp 07.11.19 3:02 PM Page 7 Model Item Cooling ❈1 Capacity Btu/h Rated(Minimum~Maximum) Heating 47 ❈1 Btu/h Heating 17 ❈2 Capacity Rated Btu/h Cooling ❈1 Power consumption W Rated(Minimum~Maximum) Heating 47 ❈1 W Power consumption Rated Heating 17 ❈2 W EER ❈1 [SEER] ❈3 Cooling HSPF IV(V) ❈4 Heating COP Heating ❈1 Outdoor unit model External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance (at 68˚F) Ω Compressor R.L.
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OB451C--1.qxp 07.11.19 3:02 PM Page 8 Test condition (Unit : [˚F]) ❈3, ❈4 Mode ARI Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb SEER "A" Cooling Steady State (Cooling) at rated compressor Speed 80 67 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) "B-1" Cooling Steady State at minimum compressor Speed 80 67 82 (65) Low ambient Cooling Steady State at minimum compressor Speed 80 67 67 (53.
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OB451C--1.qxp 07.11.19 3:02 PM 4 Page 9 OUTLINES AND DIMENSIONS MUZ-A09NA MUZ-A17NA MUZ-A12NA MUY-A15NA MUZ-A15NA MUY-A17NA Unit: inch REQUIRED SPACE 1-3/4 15-3/4 Drain hole [ 1-5/8 Air in . or 4 in 13-9/16 12 ~ 12-3/4 11/16 Air in 4 in . or e mor mo re 14 1-9/16 Air out e 2- 3/8 o 13/16 Oval hole 7/8 8 29/32 11-1/4 in. or or m in. or m ore 17/32 Open two sides of left, right, or rear side.
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OB451C--1.qxp 6 07.11.19 3:02 PM Page 14 REFRIGERANT SYSTEM DIAGRAM MUZ-A09NA MUZ-A09NA- U1 MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA Unit:inch Refrigerant pipe [3/8 (MUZ-A09/12) [1/2 (MUZ-A15/17,MUY-A15/17) (with heat insulator) 4-way valve Muffler Stop valve (with service port) Outdoor heat exchanger Muffler Discharge temperature thermistor RT62 Service port Flared connection Service port Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 Capillary tube O.D.
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OB451C--1.qxp 07.11.19 3:02 PM Page 15 MUZ-A24NA Muffler 4-way valve #100 Refrigerant pipe [5/8 (with heat insulator) Stop valve (with service port) Flared connection Discharge temperature thermistor RT62 Service port Defrost thermistor RT61 Service port Outdoor heat exchanger Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection LEV Strainer Receiver #100 Stop valve Strainer #100 Capillary tube O.D. 0.142 o I.D. 0.
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OB451C--1.qxp 07.11.19 3:03 PM Page 16 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Max. length A Model MUZ-A09NA MUZ-A12NA MUZ-A15NA MUY-A15NA MUZ-A17NA MUY-A17NA MUZ-A24NA MUY-A24NA Refrigerant piping : ft Max. Height difference B 65 Piping size O.D : in Gas Liquid 3/8 1/4 1/2 1/4 5/8 1/4 40 100 50 Indoor unit Max. Height difference B Max. length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A:oz.) Refrigerant piping exceeding 25ft.
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OB451C--1.qxp 07.11.19 3:03 PM 7 Page 17 DATA MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Model 75 IWB (˚F) 85 TC SHC TPC TC SHC 71 11.0 6.4 0.61 10.3 67 10.4 7.4 0.58 63 9.8 8.3 71 11.0 67 63 71 MUZ-A09NA MUZ-A09NA - U1 MUZ-A09NA - Outdoor intake air DB temperature(˚F) 95 105 115 TPC TC SHC TPC TC SHC TPC 5.6 0.72 9.0 5.2 0.76 8.3 4.8 0.79 9.0 6.4 0.69 8.4 5.9 0.
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OB451C--1.qxp 07.11.19 3:03 PM Page 18 3) HEATING CAPACITY Indoor air Model IDB (˚F) Outdoor intake air WB temperature(˚F) 15 25 35 TC TPC TC TPC 75 6.3 0.64 7.9 0.75 70 6.7 0.62 8.2 65 6.9 0.59 75 6.3 70 65 TC 43 45 55 TPC TC TPC TC TPC TC TPC 9.4 0.84 10.6 0.88 11.0 0.89 12.4 0.93 0.74 9.6 0.82 10.9 0.86 11.2 0.88 12.7 0.91 8.6 0.71 10.0 0.80 11.2 0.84 11.6 0.85 13.0 0.89 0.64 7.9 0.75 9.4 0.84 10.6 0.88 11.0 0.89 12.4 0.93 6.
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Page 19 7-2. PERFORMANCE CURVE Cooling MUZ-A09NA MUZ-A09NA- U1 MUZ-A09NA- 1 MUZ-A09NA- U2 e air W B tem peratu re (°F ) 71 67 63 0.9 0.8 ke air door inta perature WB tem (°F) In 0.7 0.6 0.5 0.4 65 r intak 75 85 95 105 Outdoor intake air DB temperature (°F) 71 67 63 115 Indoo 12 11 10 9 8 7 6 Total capacity ( ✕103 Btu/h) Indoo 12 11 10 9 8 7 6 SHF at rating condition = 0.70 Airflow = 318 CFM SHF at rating condition = 0.
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OB451C--1.qxp 07.11.19 3:03 PM Page 20 7-3. Condensing pressure Cooling Data is based on the condition of indoor humidity 50%. Air flow should be set to High speed.
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OB451C--1.qxp 07.11.19 3:03 PM Page 22 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.
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OB451C--1.qxp 07.11.19 3:03 PM Page 24 7-4. STANDARD OPERATION DATA Model MSZ-A09NA Item Total Capacity Cooling Cooling Heating 10,900 9,000 10,900 12,000 13,600 Unit Heating Btu / h 9,000 — 0.71 – 0.71 – 0.70 – Input kW 0.690 0.860 0.690 0.860 1,170 1,160 Rated frequency Hz 50 61 50 63 76 76 SHF Indoor unit Electrical circuit Input Fan motor current Aux. heater current MSZ-A09NA MSZ-A12NA 208/230, 1, 60 208/230, 1, 60 kW 0.016 0.021 A 0.18 / 0.16 0.
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OB451C--1.qxp 07.11.19 3:03 PM Page 25 MSZ-A15NA MSZ-A17NA MSY-A17NA MSZ-A17NA Unit MSZ-A15NA MSY-A15NA Cooling Heating Cooling Heating Btu / h 15,000 18,000 16,200 20,100 SHF — 0.65 – 0.65 – Input kW 1.69 1.79 2.07 2.15 Rated frequency Hz 77 78 89 88 Model Item Total Capacity MSZ-A15NA, MSY-A15NA MSZ-A17NA, MSY-A17NA 208/230, 1, 60 208/230, 1, 60 kW 0.030 0.030 A 0.31 / 0.28 0.31 / 0.
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OB451C--1.qxp 07.11.19 3:03 PM Page 26 MSZ-A24NA MSY-A24NA MSZ-A24NA Unit Cooling Heating Btu / h 22,000 23,200 SHF — 0.63 – Input kW 2.88 2.35 Rated frequency Hz 110 101 Model Item Total Capacity MSZ-A24NA , MSY-A24NA Indoor unit 208/230, 1, 60 Power supply (V, phase, Hz) kW 0.053 Fan motor current A 0.52 / 0.47 Aux. heater current A Electrical circuit Input Outdoor unit MUZ-A24NA 208/230, 1, 60 Power supply (V, phase, Hz) Input Comp. current kW 2.827 2.
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OB451C--1.qxp 07.11.19 3:03 PM Page 27 7-5. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed Voltage Min. 188V 208V 230V Max.
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OB451C--1.qxp 07.11.19 3:03 PM Page 28 7-6. Capacity and input correction by inverter output frequency MUZ-A09NA MUZ-A09NA - U1 Correction of Cooling total input Capacity correction factors Input correction factors Capacity correction factors 2.0 1.0 1.0 0.5 0.5 Correction of Heating total input 2.0 Correction of Heating capacity 1.5 Input correction factors Correction of Cooling capacity 1.5 1.5 1.0 0.5 1.5 1.0 0.5 0.0 0.0 0.0 0.
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07.11.19 3:03 PM Page 29 MUZ-A17NA MUY-A17NA MUZ-A17NA Correction of Cooling capacity Correction of Cooling total input 0.5 0 50 100 Capacity correction factors 1.0 1.0 0.5 150 (Hz) Correction of Heating total input Correction of Heating capacity 1.5 1.5 Input correction factors Capacity correction factors 1.5 0 50 100 1.5 Input correction factors OB451C--1.qxp 1.0 0.5 0 150 (Hz) 50 100 Correction of Cooling total input 50 100 150 (Hz) 100 150 (Hz) 1.0 0.
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OB451C--1.qxp 8 07.11.19 3:03 PM Page 30 ACTUATOR CONTROL MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUY-A15NA MUY-A17NA MUY-A24NA 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. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan motor 8-2. R.V. coil control Heating . . .
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OB451C--2.qxp 07.11.19 3:05 PM 9 Page 31 SERVICE FUNCTIONS MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA CHANGE IN DEFROST SETTING When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 10-6.1.
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OB451C--2.qxp 07.11.19 3:05 PM Page 32 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. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur. 1.
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OB451C--2.qxp 07.11.19 3:05 PM Page 33 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confirm if outdoor unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function.
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OB451C--2.qxp 07.11.19 3:05 PM Page 34 3. Outdoor unit failure mode table MUZ-A09/12/15/17NA The left lamp of OPERATION INDICATOR lamp(Indoor unit) MUY-A15/17NA Abnormal point (Failure mode / protection) LED indication (Outdoor P.C. board) None (Normal) OFF Outdoor power system 2-time flash 2.5 seconds OFF When it consecutively occurs 3 times that the compressor stops for overcurrent protection within 1 minute after start-up. Discharge temperature thermistor 1-time flash every 3-time flash 2.
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OB451C--2.qxp 07.11.19 3:05 PM Page 35 MUZ-A24NA MUY-A24NA The left lamp of OPERATION INDICATOR lamp(Indoor unit) Abnormal point (Failure mode / protection) LED indication Condition (Outdoor P.C.
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OB451C--2.qxp 07.11.19 3:05 PM The left lamp of OPERATION INDICATOR lamp(Indoor unit) 11-time flash Page 36 Abnormal point (Failure mode / protection) LED indication (Outdoor P.C. board) LED 1 LED 2 Condition Correspondence Communication error between P.C. boards Lighting 6 times Communication error occurs between the electronic control P.C. board and power board for more than 10 seconds. When the communication between boards protection stop is continuously performed twice.
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OB451C--2.qxp 07.11.19 3:05 PM Page 37 10-3. Troubleshooting check table MUZ-A09/12/15/17NA MUY-A15/17NA No. 1 Symptom Outdoor unit does not operate. LED indication Abnormal point/ Condition 1-time flash every Outdoor power 2.5 seconds system 2 Outdoor thermistors 3 Outdoor control system Serial signal · Check stop valve. · Reconnect connector of compressor. · Refer to 10-5.A "How to check inverter/ compressor".
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OB451C--2.qxp 07.11.19 3:05 PM Page 38 MUZ-A24NA MUY-A24NA No. Symptom Indication LED1(Red) LED2(Yellow) Condition Abnormal point / Condition Outdoor unit does not operate. 1 Lightning Twice Outdoor power system When IPM protection stop or lock protection stop is continuously performed three times within 1 minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed three times within 3 minutes after start-up.
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OB451C--2.qxp 07.11.19 3:05 PM Page 39 No. Symptom Indication LED1(Red) LED2(Yellow) Outdoor unit 20 operates. Once Lighting Primary current protection When the input current exceeds 15A. Secondary current protection When the current of the compressor exceeds 15A. High-pressure protection (MUZ) 21 Twice Condition Abnormal point / Condition Lighting Defrosting in cooling Correspondence These symptoms do not mean any abnormality of the product, but check the following points.
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OB451C--2.qxp 07.11.19 3:05 PM Page 40 10-4. Trouble criterion of main parts MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA Part name Check method and criterion Defrost thermistor (RT61) (MUZ) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor. Discharge temperature thermistor (RT62) Measure the resistance with a tester.
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OB451C--2.qxp 07.11.19 3:05 PM MUZ-A24NA Page 41 MUY-A24NA Part name Check method and criterion Defrost thermistor (RT61) (MUZ) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 10-6. “Test point diagram and voltage”,3. “Outdoor electronic control P.C. board”, the chart of thermistor. Figure Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Measure the resistance with a tester.
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OB451C--2.qxp 07.11.19 3:05 PM Page 42 10-5. Troubleshooting flow When OPERATION / INDICATOR lamp flashes 5-times. Outdoor unit does not operate. A How to check inverter/ compressor MUZ-A09/12/15/17 MUY-A15/17 Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. Are the voltages balanced? See 10-5.B “Check of open phase” . No Check the resistance of the intelligent power module. See 10-5.
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OB451C--2.qxp 07.11.19 3:05 PM Page 43 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. Output voltage 115V << Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-7.
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OB451C--2.qxp 07.11.19 3:05 PM Page 44 F Check of compressor operation time MUZ-A09/12/15/17 MUY-A15/17 ●Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to overcurrent. <> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-7.) <> Measure the time from the start of outdoor fan running to the stop of compressor due to overcurrent.
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OB451C--2.qxp 07.11.19 3:05 PM Page 45 • When OPERATION INDICATOR lamp flashes 6-times. • When thermistor is abnormal. G Check of outdoor thermistors MUZ-A24 MUY-A24 Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board No (see below table), and measure the resistance of thermistor. Is the thermistor normal? (Refer to 10-6.3.) Yes Reconnect the connector of thermistor, disconnect the lead wire leading to the compressor.
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OB451C--2.qxp 07.11.19 3:05 PM Page 46 The cooling operation or heating operation does not operate. H Check of R.V. coil MUZ-A24 • When heating operation does not work. 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 208/230V AC between pin1 and pin 2 at connector CN912? W No Yes Turn off power supply of indoor and outdoor unit. Disconnect the connector CN912 in noise filter P. C.
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OB451C--2.qxp 07.11.19 3:05 PM Page 47 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-A09/12/15/17 MUY-A15/17 Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.) Yes Disconnect CN932 from the inverter P.C. board. Rotate the outdoor fan slowly by hand, and measure the voltage of CN931 (Measurement of feedback output). Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) Turn ON the power supply. No Inverter P.C.
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OB451C--2.qxp 07.11.19 3:05 PM Page 48 Inverter does not operate. J Check of power supply MUZ-A09/12/15/17 MUY-A15/17 Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Rectify indoor/ outdoor connecting wire. No Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? Yes Is there voltage 280V ~ 370V DC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 10-6.1.
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OB451C--2.qxp 07.11.19 3:05 PM Page 49 Outdoor unit does not operate at all, or stops immediately due to overcurrent. 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-limiting resistor (R64A or R64B) on the power P.C. board normal? (Normal resistance : 5' i5%) Yes Turn ON the power supply and press EMERGENCY OPERATION switch.
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OB451C--2.qxp 07.11.19 3:05 PM Page 50 Heating/Cooling does not work sufficiently. L Check of LEV (Expansion valve) MUZ-A09/12/15/17 MUY-A15/17 Turn ON the power supply. 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. 2 First, release RESET button. And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.
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OB451C--2.qxp 07.11.19 3:05 PM Page 51 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. L Check of LEV MUZ-A24 MUY-A24 Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Yes Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Normal No Disconnect the connector CN795.
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OB451C--2.qxp 07.11.19 3:05 PM Page 52 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5 seconds. Outdoor unit doesn’t operate. N How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. Is there rated voltage in the power supply? No Check the power supply. Yes Turn ON the power supply.
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OB451C--2.qxp 07.11.19 3:05 PM Page 53 O Electromagnetic noise enters into TV sets or radios No Is the unit grounded? Ground the unit. Yes Is the distance between the antennas and the indoor unit within 9.91ft., or is the distance between the antennas and the outdoor unit within 9.91ft.? Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. No Is the distance between the TV sets or radios and the indoor unit within 3.28ft.
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OB451C--2.qxp 07.11.19 3:06 PM Page 54 10-6. Test point diagram and voltage 1. Inverter P.C.
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OB451C--2.qxp 07.11.19 3:06 PM Page 55 2. Power P.C. board MUZ-A09NA MUZ-A17NA MUZ-A12NA MUY-A15NA Back side of unit MUZ-A15NA MUY-A17NA Varistor (NR63) Varistor (NR62) Varistor (NR64) Front side of unit 208/230V AC MUZ R.V.coil (CN721) 208/230V AC Connecting wire with inverter P.C.
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OB451C--2.qxp 07.11.19 3:06 PM Page 56 3. Outdoor electronic control P.C. board MUY-A24NA Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Fin temperature thermistor (RT64) Outdoor heat exchanger temperature thermistor (RT68) 200 600 160 500 400 300 90 140 120 100 80 60 200 50 10 -4 14 32 50 68 86 104 Temperature (°F) (–) ( CN781 LEV (+) ( (+) (–) (+) (+) (–) GND (power board) Rush current relay (–) 12V R.V.
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OB451C--2.qxp 07.11.19 3:06 PM Page 57 4. Noise filter P.C. board MUZ-A24NA MUY-A24NA CN901 To electronic CN902 CN903 control To power To power P.C. board board board { { 208/230V AC 60Hz Input { { MUZ CN912 R.V.
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OB451C--2.qxp 07.11.19 3:06 PM Page 58 5. Outdoor power board MUZ-A24NA MUY-A24NA Connect to the compressor Voltage among phases: 5V to 180V 294-370V DC Output (Red) (+) 1 Connect to the earth CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5V DC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15V (+)7-5(–): 15V (–) 3 (White) CN3 Fin temperature thermistor RT64 reception (From ) Signal electronic control P.C.
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OB451C--2.qxp 07.11.19 3:06 PM 11 Page 59 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. (1) Slide the sleeve and check if there is a locking lever or not.
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OB451C--2.qxp 07.11.19 3:06 PM Page 60 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power P.C. board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the ground wires(See Photo 3.), the lead wire to the reactor and the following connectors; CN721 (4-way valve coil)
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OB451C--3.qxp 07.11.19 3:17 PM Page 61 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut. (5) Remove the propeller. (6) Remove the screws fixing the fan motor. (See Photo 7.) (7) Remove the fan motor. 6.
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OB451C--3.qxp 07.11.19 3:18 PM Page 62 11-2. MUZ-A24NA MUY-A24NA 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. (5) Remove the top panel. (6) Remove the valve cover. (7) Remove the screws of the cabinet. (8) Remove the cabinet. (9) Remove the screws of the back panel. (10) Remove the back panel.
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OB451C--3.qxp 07.11.19 3:18 PM Page 63 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power board (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; CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost thermistor (MUZ) and outdoor heat exchanger temperature thermistor)
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OB451C--3.qxp 07.11.19 3:18 PM Page 64 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor (MUZ), discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 5 Discharge 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. (Refer to 2.) (4) Pull out the defrost thermistor from its holder.
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OB451C--3.qxp 07.11.19 3:18 PM Page 65 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. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (5) Detach the welded part of the suction and the discharge pipe connected with compressor.
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OB451C--3.qxp 07.11.19 3:18 PM 12 Page 66 PARTS LIST 12-1. PARTS LIST (non-RoHS compliant) MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1.
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OB451C--3.qxp 07.11.19 3:18 PM Page 67 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Symbol No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Part No.
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OB451C--3.qxp 07.11.19 3:18 PM Page 68 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2.
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OB451C--3.qxp 07.11.19 3:18 PM Page 69 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2. OUTDOOR UNIT ELECTRICAL PARTS No. 1 2 3 4 5 6 7 8 Part No. E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 838 A54 A54 927 927 A54 A55 A54 A55 A56 A57 337 444 490 306 308 374 374 451 451 451 451 Q'ty/unit Symbol in Wiring MUZMUYDiagram A09NA A12NA A15NA A17NA A15NA A17NA 1 1 1 1 1 1 REACTOR L61 1 1 1 1 1 1 POWER P.C. BOARD 1 1 1 1 R.V.
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OB451C--3.qxp 07.11.19 3:18 PM Page 70 MUZ-A24NA MUY-A24NA 3.
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OB451C--3.qxp 07.11.19 3:18 PM Page 71 MUZ-A24NA MUY-A24NA 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Part No.
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OB451C--3.qxp 07.11.19 3:18 PM Page 72 12-2. RoHS PARTS LIST (RoHS compliant) MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1.
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OB451C--3.qxp 07.11.19 3:18 PM Page 73 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 RoHS Part numbers that are circled are not shown in the illustration. Part No.
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OB451C--3.qxp 07.11.19 3:18 PM Page 74 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2.
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OB451C--3.qxp 07.11.19 3:18 PM Page 75 MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA 2. OUTDOOR UNIT ELECTRICAL PARTS No. RoHS Q'ty/unit 1 2 3 4 G G G G Part No. E12 838 E12 A54 E12 A54 E12 927 337 444 490 306 5 G E12 927 308 6 G E12 A54 374 7 G E12 A55 374 G E12 A54 451 G E12 B49 451 G E12 A55 451 G E12 A56 451 8 G E12 A57 451 G E12 B09 451 G E12 B51 451 G E12 B10 451 G E12 B11 451 G E12 B12 451 Part Name Symbol in Wiring Diagram 1 REACTOR L61 1 POWER P.C. BOARD R.V.
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OB451C--3.qxp 07.11.19 3:18 PM Page 76 MUZ-A24NA MUY-A24NA 3.
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OB451C--3.qxp 07.11.19 3:18 PM Page 77 MUZ-A24NA MUY-A24NA 3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS No. RoHS Part numbers that are circled are not shown in the illustration. 1 G G 2 G 3 G 4 G 5 G 6 G 7 G 8 G 9 G 10 G 11 G 12 G 13 G 14 G 15 G 16 G 17 G 18 G 19 G 20 G 21 G 22 G G 23 G 24 G G 25 G 26 G G 27 G G 28 G 29 G 30 G 31 G Part No.
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OB451C--3.qxp 13 07.11.19 3:18 PM Page 78 OPTIONAL PARTS 13-1. DRAIN SOCKET Model Parts No. MUZ-A09/12/15/17NA MUY-A15/17NA MAC-851DS 13-2. DRAIN SOCKET ASSEMBLY Model Parts No. MUZ-A24NA MUY-A24NA MAC-811DS HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Nov. 2007. No. OB451 REVISED EDITION-C 7 Distributed in Feb. 2007. No. OB451 REVISED EDITION-B 7 Distributed in Sep. 2006. No.