Revision B: • MUZ-D•NA- 1 /- U2 and MUY-D•NA- 1 have been corrected. Please void OBH502 REVISED EDITION-A. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL HFC utilized No. OBH502 REVISED EDITION-B R410A Models MUZ-D30NA / - / - / MUZ-D36NA / - / - / MUY-D30NA / MUY-D36NA / 1 U1 U2 1 U1 U2 1 1 Indoor unit service manual MSZ-D•NA Series (OBH501) MSY-D•NA Series (OBH501) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2.
Revision A: • 3. SPECIFICATION has been corrected. Revision B: • MUZ-D•NA- 1 /- U2 and MUY-D•NA- 1 have been corrected.
1 TECHNICAL CHANGES MUZ-D30NA MUZ-D30NA- U1 MUZ-D36NA MUZ-D36NA- U1 MUY-D30NA MUY-D36NA 1. New model MUZ-D30NA → MUZ-D36NA → MUY-D30NA → MUY-D36NA → MUZ-D30NAMUZ-D36NAMUY-D30NAMUY-D36NA- 1 1 MUZ-D30NA- U1 → MUZ-D30NA- U2 MUZ-D36NA- U1 → MUZ-D36NA- U2 1 1 1. Wiring diagram has been changed. 2. Fan motor has been changed.
3 SPECIFICATION Item Capacity Rated (Minimum ~ Maximum) Capacity Model Cooling 1 Btu/h Heating 47 1 Heating 17 2 Btu/h Power consumption Cooling 1 Rated (Minimum ~ Maximum) (TOTAL) W Heating 47 1 Power consumption Heating 17 2 W EER 1 [SEER] 3 Cooling Heating HSPF IV(V) 4 COP Heating 1 Outdoor unit model Power supply V , phase , Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model R.L.A Compressor L.R.
Test condition 3, 4 ARI Mode Indoor air condition (°F) Dry bulb Wet bulb Test Outdoor air condition (°F) Dry bulb Wet bulb "A" Cooling Steady State at rated compressor Speed 80 67 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) 80 67 82 (65) Low ambient Cooling Steady State at minimum compressor Speed 80 67 67 (53.
4 OUTLINES AND DIMENSIONS MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA REQUIRED SPACE 4 in . or Unit: inch Open as a rule 20 inch or more if the front and both sides are open 4 inch or more / 8 inch or more if there are obstacles to both sides mo re 14 Open as a rule 20 inch or more if the back, both sides and top are open 6 in.
5 WIRING DIAGRAM MUZ-D30NA MUZ-D30NA- U1 MUZ-D36NA MUZ-D36NA- U1 7
MUZ-D30NA- 1 MUZ-D30NA- U2 MUZ-D36NA- 8 1 MUZ-D36NA- U2
MUY-D30NA MUY-D36NA 9
MUY-D30NA- 1 MUY-D36NA- 1 10
6 REFRIGERANT SYSTEM DIAGRAM MUZ-D30NA MUZ-D36NA Unit: inch Oil separator Refrigerant pipe 5/8 (with heat insulator) Capillary tube O.D. 0.071 x I.D. 0.024 x 39-3/8 ( 1.8 x 0.
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Refrigerant piping: ft. Max. Length Max. Height difference A B MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA 100 Piping size O.D: in. 50 Gas Liquid 5/8 3/8 Indoor unit Max. Height difference B Max. Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft.
7 DATA MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Model MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA (208 V) MUY-D36NA (230 V) IWB (˚F) 71 67 63 71 67 63 71 67 63 71 67 63 71 67 63 TC 37.6 35.6 33.5 40.7 38.5 36.2 37.6 35.6 33.5 40.7 38.5 36.2 42.4 40.1 37.7 75 SHC 19.1 22.8 25.9 19.8 23.9 27.3 19.1 22.8 25.9 19.8 23.9 27.3 20.6 24.9 28.4 TPC 3.43 3.23 3.08 3.88 3.66 3.49 3.01 2.84 2.70 3.75 3.54 3.37 3.77 3.56 3.39 85 SHC 17.8 21.2 24.0 18.5 22.2 25.
B air W take or in Indo 75 take air W B te mpe ratu re (° F) (°F) ture pera tem 85 95 105 Outdoor intake air DB temperature (°F) 71 67 63 71 67 63 115 SHF at rating condition = 0.62 Airflow = 763 CFM 43 41 39 37 35 33 31 29 27 Indo or in take air WB tem pera tur e (° 5.2 4.8 B air W take or in Indo 4.4 4.0 F) (°F) ture pera tem 71 67 63 71 67 63 3.6 65 75 85 95 105 Outdoor intake air DB temperature (°F) 115 Total capacity ( 103 Btu/h) 4.5 4.3 4.1 3.9 3.7 3.5 3.3 3.
7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50%. Air flow should be set to High speed.
MUY-D36NA (PSIG) 580 Condensing pressure 540 500 86 80 75 70 ) (°F (PSIG) 150 140 Suction pressure 460 a per em t DB oor Ind e tur 420 380 340 Indoor DB 130 re (°F) temperatu 86 80 120 75 110 70 100 300 260 68 70 75 80 85 90 95 100 90 68 70 105(°F) 75 80 85 90 95 Outdoor ambient temperature Outdoor ambient temperature 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.
7-4. STANDARD OPERATION DATA Model MSY-D30NA MSY-D36NA Unit Cooling MSZ-D30NA Heating Cooling Heating Cooling Cooling Btu/h 30,700 32,600 32,000/33,200 35,200 30,700 33,200/34,000 SHF — 0.64 — 0.62 — 0.64 0.62 Input kW 3.85 3.36 4.14/4.36 3.84 3.38 4.21/4.24 Rated frequency Hz 84 84 91 91 Item Total Capacity Indoor unit MSZ-D30NA Electrical circuit Input Fan motor current Refrigerant circuit kW 0.058 A 0.45/0.
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-D30NA Correction of Cooling total input 0.5 50 100 Capacity correction factors Input correction factors Capacity correction factors 1.0 0 1.5 1.5 1.0 0.5 150 (Hz) 0 50 100 Correction of Heating capacity 1.0 0.5 0 150 (Hz) 1.5 Input correction factors Correction of Cooling capacity 1.
7-6. TEST RUN OPERATION (How to operate fixed-frequency operation) 1. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor varies). 6.
8 ACTUATOR CONTROL MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA 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 OFF 8-2. R.V. COIL CONTROL Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . .
9 SERVICE FUNCTIONS MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA 9-1. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the start-up of the compressor. To improve start-up condition, the compressor is energized even while it is not operating. This is to generate heat at the winding. The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is OFF at initial setting.
10 TROUBLESHOOTING MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA 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 confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
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. Flow chart of failure mode recall function for the indoor/outdoor unit This figures show about MSZ type. Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
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. 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).
3. Outdoor unit failure mode table MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA The left lamp of OPERATION INDICATOR lamp (Indoor unit) OFF 2-time flash Abnormal point (Failure mode / protection) Non (Normal) LED indication (Outdoor P.C.
The left lamp of OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode / protection) LED indication (Outdoor P.C. board) LED 1 11-time flash Condition 5 times failure is detected in the operation of the converter durGoes out A ing operation. Bus-bar voltage (1) 5 times bus-bar voltage exceeds 400 V or falls to 200 V or Goes out The below during compressor operating.
10-3. TROUBLESHOOTING CHECK TABLE MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA No. Indication LED1 LED2 (Red) (Yellow) Symptom 1 Lightning Twice 2 Lightning 3 times 3 Lightning 4 times 4 Outdoor unit does not operate.
No. Symptom Indication LED1 LED2 (Red) (Yellow) 20 Once Lighting 21 Twice Lighting Abnormal point / Condition Primary current protection Secondary current protection High-pressure protection (MUZ) Defrosting in cooling 22 Outdoor unit operates. 23 24 25 26 Outdoor unit operates Condition The input current exceeds 15 A. The current of the compressor exceeds 15 A. The indoor gas pipe temperature exceeds 113°F (45°C) during heating.
10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA Part name Defrost thermistor (RT61) (MUZ) Check method and criterion Figure Ambient temperature thermistor (RT65) Measure the resistance with a tester. Outdoor heat exRefer to 10-6. “Test point diagram and voltage”, 1. “Outdoor electronchanger temperature ic control P.C. board”, for the chart of thermistor.
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION. Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Is there output voltage? Yes Is output balanced? Yes •After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage. •Output voltage is 50 - 130 V.
B 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 thermistor normal? (Refer to 10-6.1.) Yes No Replace the thermistor except RT64. When RT64 is abnormal, replace the outdoor power board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
C Check of R.V. coil MUZ-D30/36 • 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 208/230 VAC between pin1 and pin 2 at connector CN912? Yes No Turn OFF power supply of indoor and outdoor unit. Disconnect the connector CN912 in noise filter P.C. board. Is there normal resistance to R.V. coil? No Replace the R.V. coil. 1.
D Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.) No Yes Disconnect CN932 from outdoor electronic control P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) (Fixed to either 5 or 0 VDC) No No Replace the outdoor DC fan motor.
F Check of compressor start failure Confirm that 1~4 is normal. •Electrical circuit check 1. Contact of lead wire leading to compressor 2. Output voltage of the outdoor electronic control P.C. board and balance of them (See 10-5. ) 3. Direct current voltage to the outdoor electronic control P.C. board 4. Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or more after it starts? Yes Check the refrigerant circuit. Check the stop valve.
H How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. No Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring. No Press EMERGENCY OPERATION switch once.
I Check of HPS 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF. Check the resistance between each terminal. Infinity Replace HPS. 0Ω Reconnect CN681. Turn ON power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION. Is HPS protection displayed immediately after compressor starts? No Yes Replace the outdoor electronic control P.C. board.
K Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. No Yes Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.? Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Outdoor electronic control P.C.
2. Noise filter P.C. board MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA CN901 CN903 To electronic CN902 control P.C. To power To power board board board 208/230 VAC 60 Hz Input MUZ CN912 R.V.
3. Outdoor power board MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA Connect to the compressor Voltage among phases: 180 V Connect to the ground 294-370 VDC Output (Red) (+) 1 CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5 VDC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15 V (+)7-5(–): 15 V (–) 3 (White) CN3 Fin temperature thermistor RT64 Signal reception (From electronic control P.C.
11 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. (2) The terminal with this connector has the locking mechanism.
OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, P.C. board and power board Photo 4 (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Disconnect the following connectors: CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost thermistor (MUZ) and outdoor heat exchanger temperature thermistor) CN663 (Ambient temperature thermistor) CN681 (High pressure switch) (MUZ)
OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor (MUZ), discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Disconnect the following connectors:
OPERATING PROCEDURE 6. Removing the compressor and 4-way valve PHOTOS Photo 9 (1) Remove the top panel, cabinet, service panel and the back panel. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Remove the R.V. coil. (Refer to 3.) (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. (Photo 9) (6) Remove the compressor nuts.
