SERVICE MANUAL MUZ-GC25VA - MUZ-GC25VAH - MUZ-GC35VA - MUZ-GC35VAH - E1 OUTDOOR UNIT. No. OBH469. Wireless type Models HFC

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1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL Wireless type Models E1 - E1 H - E1 - - E1 HFC utilized R410A. OBH469 Indoor unit service manual MSZ-GC VA Series (OBH468) H CONTENTS 1. TECHNICAL CHANGES 2 2. PART NAMES AND FUNCTIONS 2 3. SPECIFICATION 3 4. NOISE CRITERIA CURVES 5 5. OUTLINES AND DIMENSIONS 6 6. WIRING DIAGRAM 7 7. REFRIGERANT SYSTEM DIAGRAM PERFORMANCE CURVES ACTUATOR CONTROL SERVICE FUNCTIONS TROUBLESHOOTING DISASSEMBLY INSTRUCTIONS 42 PARTS CATALOG (OBB469) NOTE: RoHS compliant products have <G> mark on the spec name plate.

2 1 TECHNICAL CHANGES MUZ-GA25VA - E3 - E1 MUZ-GA25VAH - E3 H - E1 MUZ-GA35VA - E3 - E1 MUZ-GA35VAH - - E1 1.Outdoor model has been changed. 2 PART NAMES AND FUNCTIONS H Air inlet Air inlet Piping Drain hose Air outlet Piping Drain hose Air outlet Drain outlet Drain outlet ACCESSORIES 1 Drain socket 1 1 2

3 3 SPECIFICATION Outdoor model H Capacity Electrical data Function Power supply Capacity Rated frequency(min.-max.) Dehumidification Air flow 1 Power outlet Running current 1(Total) Power input 1(Total) Power factor 1(Total) Starting current 1(Total) Compressor motor current 1 Fan motor current 1 Model Output Fan motor Model Dimensions WOHOD Weight Sound level 1 Fan speed Fan speed regulator Refrigerant filling capacity(r410a) Refrigeration oil (Model) kw r/h K /h A A W % A A A Coefficient of performance(c.o.p) 1(Total) Compressor Special remarks W mm kg db(a) rpm kg cc Cooling 2.5 ( ) 1.4 1, KNB065FDTH(C) 500 RA6V21-AB or BB 684o540o Heating Single phase 230V,50Hz 3.2 ( ) 1, (NEO22) Cooling 3.5 ( ) 2.0 2, , KNB073FEDH or FGDH 550 RC0J50-AM 800o550o / Heating 4.0 ( ) 2, , /810/650 3 NOTE : Test conditions are based on ISO 5151 Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19: Outdoor Dry-bulb temperature 35: Heating : Indoor Dry-bulb temperature 20: Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6: Refrigerant piping length (one way): 5m 1 Measured under rated operating frequency 3

4 Specifications and rating conditions of main electric parts Item Model H Current (CT) transformer (CT761, CT781) Smoothing (C61,C62) capacitor (C63A, C63B, C63C) Diode module (DB61) (DB65) (DB61, DB65) Fuse (F61) (F701, F801) (F71,F801,F901) Defrost heater (H) Intelligent power module (IPM) Expansion valve coil (LEV) Reactor (L61) Current-detecting (R61) resistor (R825,R831) Current-limiting PTC thermistor (PTC64) Current-limiting resistor (R64A, R64B) Terminal block (TB1,TB2) Relay (X61) (X63) (X64) (X66) R.V. coil (21S4) Heater protector (26H) Outdoor fan motor thermal fuse IGBT (TR821) 20A V 15A 600V 10A 600V T20AL250V T3.15AL250V 230V 130W 10A 600V CAM-MD12ME 12VDC 7A 18.0mH 45m" 5W 25m" 5W 33" 3P 2A 240V 3A 250V 20A 250V 3A 250V SHF-4-10W5 Open 45: Open 152: (RA6V21-AB) or Open 126: (RA6V21-BB) 3A 600V 20A V 25A 600V T3.15AL250V 230V 138W 15A 600V 10A 23.0mH 10" 5W 3A 250V STF-01AJ503 Open 45: 4

5 4 NOISE CRITERIA CURVES H FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING 46 COOLING 47 HEATING 47 HEATING OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 Test conditions Cooling : Dry-bulb temperature 35: Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: OUTDOOR UNIT 1m MICROPHONE 5

6 Bolt pitch for installation 264~ OUTLINES AND DIMENSIONS H REQUIRED SPACE Basically open 100 mm or more without any obstruction in front and on both sides of the unit. Unit: mm Drain hole [33 (Only ) 100 mm or more 100 mm or more Air in Air in 100 mm or more 350 mm or more 40 Open two sides of left, right, or rear side Air out 2 holes 10 X Service panel Handle Liquid refrigerant pipe joint Refrigerant pipe (flared) [ Gas refrigerant pipe joint Refrigerant pipe (flared) [ Bolt pitch for installation 684 Service port REQUIRED SPACE Basically open 100 mm or more without any obstruction in front and on both sides of the unit. 400 Air in Drain hole [42 () Drain hole [33 () 100 mm or more 100 mm or more Air in Bolt pitch for installation 304~ mm or more 350 mm or more holes 10 X 21 Air out Service panel Open two sides of left, right, or rear side. Handle Liquid refrigerant pipe joint Refrigerant pipe (flared) [ Service port Gas refrigerant pipe joint Refrigerant pipe (flared) [ Bolt pitch for installation 800 6

7 6 WIRING DIAGRAM 7

8 H 8

9 9

10 10

11 7 REFRIGERANT SYSTEM DIAGRAM H Refrigerant pipe [9.52 (with heat insulator) Muffler 4-way valve Unit:mm Flared connection Stop valve (with service port) Discharge temperature thermistor RT62 Muffler Compressor Defrost thermistor RT61 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Capillary tube [3.0 [ Stop valve (with strainer) Expansion valve Strainer #100 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe [9.52 (with heat insulator) Muffler 4-way valve Flared connection Stop valve (with service port) Discharge temperature thermistor RT62 Muffler Compressor Defrost thermistor RT61 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Capillary tube [3.0 [ Stop valve (with strainer) Expansion valve Muffler Strainer #100 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 11

12 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model H Refrigerant piping : m Max. length Max. Height difference A B Piping size O.D : mm Gas Liquid Indoor unit Max. Height difference B Max. length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A:g) Model H Outdoor unit precharged Refrigerant piping length (one way) 5m 6m 7m 8m 9m 10m 11m 12m 13m 14m 15m 20m Calculation : Xg=30 g/m (Refrigerant piping length (m) 5) NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation. 12

13 8 PERFORMANCE CURVES H The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. (1) GUARANTEED VOLTAGE 198 ~ 264V, 50Hz (2) AIR FLOW Air flow should be set at MAX. (3) MAIN READINGS (1) Indoor intake air wet-bulb temperature : C WB (2) Indoor outlet air wet-bulb temperature : C WB (3) Outdoor intake air dry-bulb temperature : C DB (4) Total input: W (5) Indoor intake air dry-bulb temperature : C DB (6) Outdoor intake air wet-bulb temperature : C WB (7) Total input : W Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service. } } Cooling Heating How to measure the indoor air wet-bulb / dry-bulb temperature difference 1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high. 2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun. 3. Check that the air filter is cleaned. 4. Open windows and doors of room. 5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE. 6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature minutes later, measure temperature again and check that the temperature does not change. INDOOR UNIT OUTDOOR UNIT Wet and dry-bulb thermometers Wet and dry-bulb thermometers 8-1. Capacity and input curves Indoor air Wet-bulb temperature difference (degree) H at Rated frequency Capacity correction factor Cooling capacity Indoor intake air Wet-bulb temperature (:)

14 Indoor air Wet-bulb temperature difference (degree) H at Rated frequency at Rated frequency input correction factor Total input (cooling) Indoor intake air Wet-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) Indoor air Dry-bulb temperature difference (degree) Capacity correction factor Heating capacity Indoor intake air Dry-bulb temperature (:) H at Rated frequency at Rated frequency Outdoor intake air Wet-bulb temperature (:) Indoor air Dry-bulb temperature difference (degree) Input correction factor Total input(heating) Indoor intake air Dry-bulb temperature (:) H at Rated frequency at Rated frequency Outdoor intake air Wet-bulb temperature (:) NOTE:The above broken lines are for the heating operation without any frost and defrost operation. 14

15 8-2. Capacity and input correction by operational frequency of compressor H Capacity correction factors Correction of Cooling capacity Correction of Cooling total input Input correction factors Capacity correction factors Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors Correction of Cooling capacity 1.5 Correction of Cooling total input 1.5 Correction of Heating capacity 2.0 Correction of Heating total input 2.0 Capacity correction factors Input correction factors Capacity correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors 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 58Hz 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. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller. 15

16 8-4. Outdoor low pressure and outdoor unit current COOL operation 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 8-3.) Dry-bulb temperature(:) Relative humidity(%) Outdoor low pressure H kgf/f [Gauge] MPa [Gauge] kgf/f [Gauge] MPa [Gauge] NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f [Gauge]) ( C) (%) Ambient temperature( C) Ambient humidity(%) Outdoor unit current H (A) 4 2 (A) ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) HEAT operation 1 Condition : Dry bulb temperature ( C) Wet bulb temperature ( C) Indoor Outdoor Operation : Test run operation (refer to 8-3.) Outdoor unit current H (A) (A) (:) Ambient temperature( C) (:) Ambient temperature( C) 16

17 PERFORMANCE DATA COOL operation at Rated frequency H CAPACITY:2.5(kW) SHF:0.79 INPUT:665(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE: Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 17

18 PERFORMANCE DATA COOL operation at Rated frequency H CAPACITY:2.5(kW) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT SHF:0.79 INPUT:665(W) NOTE: Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 18

19 PERFORMANCE DATA COOL operation at Rated frequency CAPACITY:3.5(kW) SHF:0.76 INPUT:1075(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE: Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 19

20 PERFORMANCE DATA COOL operation at Rated frequency CAPACITY:3.5(kW) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT SHF:0.76 INPUT:1075(W) NOTE: Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 20

21 PERFORMANCE DATA HEAT operation at Rated frequency H CAPACITY:3.2(kW) INPUT:835(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT CAPACITY:4.0(kW) INPUT:1055(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT NOTE: Q:Total capacity (kw) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature 21

22 9 ACTUATOR CONTROL H 9-1. 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. Compressor Outdoor fan motor ON OFF ON OFF 5 seconds 15 seconds 9-2. R.V. coil control Heating ON Cooling OFF Dry OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. <COOL> <HEAT> 5 seconds 5 seconds ON Compressor OFF R.V.coil ON OFF Outdoor fan ON motor OFF 9-3. Relation between main sensor and actuator Sensor Discharge temperature thermistor Purpose Protection Compressor LEV Actuator Outdoor fan motor R.V. coil Indoor fan motor Defrost heater Indoor coil temperature thermistor Cooling : Coil frost prevention Heating : High pressure protection Defrost thermistor Cooling : High pressure protection Fin temperature thermistor Heating : Defrosting Protection w1 Ambient temperature thermistor Cooling : Low outside temperature operation Heating : Defrosting (Heater) w1 22

23 10 SERVICE FUNCTIONS H CHANGE IN DEFROST SETTING <JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to ) JS Jumper wire soldered (Initial setting) none (cut) Defrost finish temperature (:) 5 8 H PRE-HEAT CONTROL SETTING PRE-HEAT CONTROL When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20 C or below. When pre-heat control is turned ON, compressor is energized. (about 50 W) MUZ-GC25 <JK> When the JK wire of the inverter P.C. board is cut, pre-heat control is activated.(refer to ) MUZ-GC35 Inverter P.C.board needs to changed. NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary. 11 TROUBLESHOOTING H Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 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, and then after confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) Before servicing check that the connector and terminal are connected properly. 3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) Refer to and

24 11-2. 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 (11-4.) 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. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality doesn't recur. Setting up the failure mode recall function Turn ON the power supply. <Preparation of the remote controller> 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. Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1 Does upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep are emitted at the same timing as the blinking of upper lamp of OPERATION INDICATOR lamp. W2 Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does upper lamp of OPERATION INDICATOR lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. (OFF) W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way. Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.(refer to ) The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table (Refer to indoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W2 The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to ). Make sure to check at least two consecutive blinking cycles. W3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the defective parts. Deleting the memorized abnormal condition 1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W2. Blinking pattern when the indoor unit is abnormal: 2.5-second OFF Blinking at 0.5- second interval 2.5-second OFF Blinking at 0.5- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle W3.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF 3-second ON second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 24

25 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 25:. W1 W1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. Does upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep are emitted at the same timing as the blinking of upper lamp of OPERATION INDICATOR lamp. W2 (Blinks) (OFF) The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to ). Make sure to check at least two consecutive blinking cycles. W2 The outdoor unit is normal. Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Release the failure mode recall function according to the left mentioned procedure. Repair the defective parts. Deleting the memorized abnormal condition 1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W2.Blinking pattern when outdoor unit is abnormal: 2.5-second OFF 3-second ON Blinking at 0.5- second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 25

26 3. Outdoor unit failure mode table The upper lamp of OPERATION INDICATOR lamp(indoor unit) OFF ne (rmal) 2-time flash Outdoor power system 4-time flash Overcurrent 5-time flash Discharge temperature 6-time flash High pressure Abnormal point (Failure mode / protection) Ambient temperature thermistor Compressor synchronous abnormality (Compressor start-up failure protection) 7-time flash Fin temperature/ P.C. board temperature LED indication (Outdoor P.C. board) Over current protection stop is continuously performed three times within 1 minute after the compressor gets started. 3-time flash Discharge temperature thermistor 1-time flash every Thermistor shorts or opens during Defrost thermistor 2.5 seconds compressor running. Fin temperature thermistor 3-time flash P.C. board temperature thermistor 4-time flash 2-time flash 11-time flash 12-time flash 7-time flash Condition 14 A (MUZ-GC25)/24 A (MUZ-GC35) current flow into intelligent power module. Waveform of compressor current is distorted. Temperature of discharge temperature thermistor exceeds 116:, compressor stops. Compressor can restart if discharge temperature thermistor reads 100: or less 3 minutes later. Temperature indoor coil thermistor exceeds 70: in HEAT mode. Temperature defrost thermistor exceeds 70: in COOL mode. Temperature of fin temperature thermistor on the inverter P.C. board exceeds 82 : (MUZ-GC25)/83: (MUZ -GC35), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 81: (MUZ-GC25) /85: (MUZ-GC35). Correspondence Reconnect connectors. Refer to A"How to check inverter/ compressor". Check stop valve. Refer to 11-5.G"Check of outdoor thermistors". Defective outdoor thermistors can be identified by checking the blinking pattern of LED. Reconnect compressor connector. Refer to 11-5.A"How to check inverter/ compressor". Check stop valve. Reconnect compressor connector. Refer to 11-5.A"How to check inverter/ compressor". Check refrigerant circuit and refrigerant amount. Refer to 11-5.L"Check of LEV". Check refrigerant circuit and refrigerant amount. Check stop valve. Check around outdoor unit. Check outdoor unit air passage. Refer to 11-5.I"Check of outdoor fan motor". Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function 8-time flash Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. Refer to 11-5.I"Check of outdoor fan motor". Refer to 11-5.M"Check of inverter P.C. board". 9-time flash nvolatile memory data 10-time flash Discharge temperature 11-time flash DC voltage Each phase current of compressor 12-time flash Overcurrent Compressor open-phase 5-time flash 8-time flash 9-time flash 10-time flash nvolatile memory data cannot be read properly. Temperature of discharge temperature thermistor has been 50: or less for 20 minutes. DC voltage of inverter cannot be detected normally. Each phase current of compressor cannot be detected normally. 14 A (MUZ-GC25) / 24 A (MUZ-GC35) current flow into intelligent power module (IPM). The open-phase operation of compressor is detected. The interphase short out occurs in the output of the intelligent power module (IPM). The compressor winding shorts out. Replace the inverter P.C. board. Refer to 11-5.L"Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to 11-5.A"How to check inverter/ compressor". Reconnect compressor connector. Refer to A"How to check inverter/ compressor". 14-time flash Stop valve (Closed valve) 14-time flash Closed valve is detected by compressor current. Check stop valve NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.). 26

27 11-3. Troubleshooting check table Symptom LED indication Abnormal point/ Condition Condition Correspondence Outdoor unit does not operate. 1-time flash every 2.5 seconds 6-time flash 11-time flash Outdoor power system Outdoor thermistors Outdoor control system Serial signal Stop valve/ Closed valve Over current protection stop is continuously performed three times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times. Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. nvolatile memory data cannot be read properly. (When the upper lamp of OPERATION INDICATOR lamp of the indoor unit lights up or flashes 7-time.) The communication fails between the indoor and outdoor unit for 3 minutes. Closed valve is detected by compressor current. Reconnect connector of compressor. Refer to 11-5.A "How to check inverter/ compressor". Check stop valve. Refer to 11-5.G "Check of outdoor thermistors". Replace inverter P.C. board. Refer to 11-5.N "How to check miswiring and serial signal error. Check stop valve 'Outdoor unit stops and restarts 3 minutes later' is repeated. 14-time flash 2-time flash 3-time flash Outdoor unit (Other abnormality) Overcurrent protection Discharge temperature overheat protection Outdoor unit is defective. 14 A (MUZ-GC25)/ 24 A (MUZ-GC35) current flows into intelligent power module, or compressor repeats after 15 seconds when overcurrent protection occures with in 10 seconds after compressor starts. (Repeated 24 times at Maximum) Temperature of discharge temperature thermistor exceeds 116:, compressor stops. Compressor can restart if discharge temperature thermistor reads 100: or less 3 minutes later. Refer to "Flow chart of the detailed outdoor unit failure mode recall function". Reconnect connector of compressor. Refer to 11-5.A "How to check inverter/compressor". Check stop valve. Check refrigerant circuit and refrigerant amount. Refer to 11-5.L "Check of LEV". 9 4-time flash Fin temperature /P.C. board temperature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 82: (MUZ-GC25)/ 83: (MUZ-GC35) or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 81: (MUZ-GC25)/ 85: (MUZ-GC35). Check around outdoor unit. Check outdoor unit air passage. Refer to 11-5.I "Check of outdoor fan motor" time flash High pressure protection Indoor coil thermistor exceeds 70: in HEAT mode. Defrost thermistor exceeds 70: in COOL mode. Check refrigerant circuit and refrigerant amount. Check stop valve time flash Compressor synchronous abnormality The waveform of compressor current is distorted. Reconnect connector of compressor. Refer to 11-5.A "How to check inverter/compressor" time flash 12-time flash 13-time flash Outdoor fan motor Each phase current of compressor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. Each phase current of compressor cannot be detected normally Refer to 11-5.I "Check of outdoor fan motor. Refer to 11-5.M "Check of inverter P.C. board. Refer to 11-5.A "How to check inverter/compressor". DC voltage DC voltage of inverter cannot be detected normally. Refer to 11-5.A "How to check inverter/compressor" Outdoor unit operates. 1-time flash 3-time flash 4-time flash Frequency drop by current protection Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode Frequency drop by discharge temperature protection Current from power outlet exceeds 5.5 A (MUZ-GC25)/ 5.2 A (MUZ-GC35 in COOL mode)/6.1 A (MUZ-GC35 in HEAT mode), compressor frequency lowers. Temperature of indoor coil thermistor exceeds 55: in HEAT mode, compressor frequency lowers. Indoor coil thermistor reads 8: or less in COOL mode, compressor frequency lowers. Temperature of discharge temperature thermistor exceeds 111:, compressor frequency lowers. The unit is normal, but check the following. Check if indoor filters are clogged. Check if refrigerant is short. Check if indoor/outdoor unit air circulation is short cycled. Check refrigerant circuit and refrigerant amount. Refer to 11-5.L "Check of LEV". Refer to 11-5.G "Check of outdoor thermistors" Outdoor unit operates. 7-time flash 8-time flash 9-time flash Low discharge temperature protection PAM protection PAM: Pulse Amplitude Modulation Inverter check mode NOTE: 1. The location of LED is illustrated at the right figure. Refer to LED is lighted during normal operation. Temperature of discharge temperature thermistor has been 50: or less for 20 minutes. The overcurrent flows into IGBT(Insulated Gate Bipolar transistor : TR821) or when the bus-bar voltage reaches 320 V or more, PAM stops and restarts. The connector of compressor is disconnected, inverter check mode starts. The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is second ON 0.5-second ON Refer to 11-5.L "Check of LEV". Check refrigerant circuit and refrigerant amount. This is not malfunction. PAM protection will be activated in the following cases; 1Instantaneous power voltage drop (Short time power failure) 2When the power supply voltage is high. Check if the connector of the compressor is correctly connected. Refer to 11-5.A "How to check inverter/ compressor". Inverter P.C. board (Parts side) Flashing LED ON OFF 2.5-second OFF 2.5-second OFF 27

28 11-4. Trouble criterion of main parts H Part name Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Discharge temperature thermistor (RT62) Fin temperature thermistor (RT64) Compressor (MC) Measure the resistance with a tester. Check method and criterion Refer to "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor. Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor. Measure the resistance between the terminals with a tester. (Part temperature 20 C ~ 40 C) MUZ-GC25 rmal MUZ-GC35 Figure WHT RED BLK W U-V U-W V-W 1.58 " ~ 2.03" 1.43 " ~ 1.84 " V U Outdoor fan motor (MF) INNER FUSE (Only MUZ-GC25) RA6V21-AB : CUT OFF RA6V21-BB 126i2 : CUT OFF Measure the resistance between the terminals with a tester. (Part temperature 20 C ~ 40 C) Color of the lead wire WHT BLK BLK RED RED WHT rmal MUZ-GC25 RA6V21-AB RA6V21-BB 292 " ~ 374 " 212 " ~ 272 " 236 " ~ 304 " 234 " ~ 300 " MUZ-GC35 31 " ~ 41 " 31 " ~ 41 " 31 " ~ 41 " MUZ-GC25 FUSE BLK RED WHT MUZ-GC35 WHT RED BLK W V U R.V. coil (21S4) Measure the resistance between the terminals with a tester. (Part temperature 20 C ~ 40 C) rmal MUZ-GC25 MUZ-GC k" ~ 1.62 k" 1.21 k" ~ 1.56 k" Expansion valve coil (LEV) Measure the resistance with a tester. (Part temperature 20 C ~ 40 C) Color of the lead wire WHT RED RED ORN YLW BRN BRN BLU rmal 38 " ~ 50 " WHT6 RED1 ORN4 LEV YLW5 BRN2 BLU3 Measure the resistance with a tester. (Part temperature 20 C ~ 40 C) rmal Defrost heater (H) MUZ-GC25 MUZ-GC " ~ 402 " 333 " ~ 428 " 28