SERVICE MANUAL FILE NO. SPW-T253G56, SPW-T303G56, SPW-T363G56, SPW-T483G56, SPW-T253GS56 SPW-T303GS56 SPW-T363GS56 SPW-T483GS56 ⁄ ⁄ ⁄ ⁄ SPW-C253G5 (/M), SPW-C253G8 (/M) SPW-C303G5 (/M) SPW-C363G5 (/M), SPW-C363G8 (/M) SPW-C483G8 (/M) SPLIT SYSTEM AIR CONDITIONER INDOOR MODEL No. PRODUCT CODE No. SPW-T253G56 854 012 50 SPW-T253GS56 854 012 54 SPW-T303G56 854 012 51 OUTDOOR MODEL No.
Important IMPORTANT! Please Read Before Starting This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. For safe installation and trouble-free operation,you must: ⓦ Carefully read this instruction booklet before beginning. ⓦ Follow each installation or repair step exactly as shown. ⓦ Observe all local, state, and national electrical codes.
WHO SHOULD USE THIS MANUAL This service manual is made to assist the service technician apply his knowledge and training to this model air conditioner. This manual is written both for experienced service persons and those who are new to air conditioning service. To help those with less experience or who are new to this kind of unit we have included more explanations of basic procedures in simple language than is usual in some service manuals.
. SERVICE PROCEDURES ........................................................................................... 55 4-1 Troubleshooting .................................................................................................. 56 4-2 A Sensor is Defective ..........................................................................................67 4-3 Operation of Major Electrical Parts .....................................................................67 4-4 Checking the Electrical Components ...
Introduction: Read Me First! WHAT IS IN THIS MANUAL This manual will help you understand and service the air conditioner. To help you find the information you need, we have divided it into 5 main sections. Each section is divided into chapters with charts, tables and explanations to help you find and repair problems. ❑ Section 1: Specifications, tells you about the physical and electrical make up of the unit, as well as its heating and cooling capacities.
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1. SPECIFICATIONS 1-1 1-2 1-3 1-4 1-5 1-6 Unit Specifications ......................................................................................... 8 Major Component Specifications .................................................................. 14 (A) Indoor Unit ................................................................................................14 (B) Outdoor Unit ...........................................................................................
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity 1 Indoor Unit Outdoor Unit SPW-T253G56 SPW-T253GS56 SPW-C253G5, C253G5/M 220 - 230 - 240 V / 1 Phase / 50 Hz Cooling 7.3 25,000 1,140/1,020/840 3.4 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity Indoor Unit Outdoor Unit SPW-T303G56 SPW-T303GS56 SPW-C303G5, C303G5/M 220 - 230 - 240 V / 1 Phase / 50 Hz Cooling 8.8 30,000 1,380/1,200/1,020 3.9 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity 1 Indoor Unit Outdoor Unit SPW-T363G56 SPW-T363GS56 SPW-C363G5, C363G5/M 220 - 230 - 240 V / 1 Phase / 50 Hz Cooling 10.6 36,000 1,680/1,410/1,200 4.8 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity Indoor Unit Outdoor Unit SPW-T253G56 SPW-T253GS56 SPW-C253G8, C253G8/M 380 - 400 - 415 V / 3N / 50 Hz Cooling 7.3 25,000 1,140/1,020/840 3.4 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity 1 Indoor Unit Outdoor Unit SPW-T363G56 SPW-T363GS56 SPW-C363G8, C363G8/M 380 - 400 - 415 V / 3N / 50 Hz Cooling 10.6 36,000 1,680/1,410/1,200 4.8 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-1 Unit Specifications MODEL No. POWER SOURCE PERFORMANCE Capacity Indoor Unit Outdoor Unit SPW-T483G56 SPW-T483GS56 SPW-C483G8, C483G8/M 380 - 400 - 415 V / 3N / 50 Hz Cooling 14 47,800 1,920/1,680/1,320 7.1 kW BTU / h m3 / h Liters/h Air circulation (Hi/Me/Lo) Moisture removal(High) ELECTRICAL RATINGS Voltage rating V Available voltage range V Running amperes* A Max. running amperes** A Power input kW Power factor % C.O.P W /W Max.
1. Specifications 1-2 Major Component Specifications (A) Indoor Unit MODEL No. SPW-T253G56 Source Remote Controller (Accessory) RCS - T251G Controller P.C.B. Ass’y RCS - 5PS3E CR - X363GS Switch Ass’y Fan (Number…diameter) SPW-T253GS56 220 - 230 - 240 V / 1 phase / 50 Hz – mm SW - X363GS Centrifugal (4...ø130) Fan Motor Model…Nominal output W Source 1 No. of pole…r.p.m. (230 V, High) Coil resistance (Ambient temperature 20 °C) KFG4Q - 41A5P...40 W 220 - 230 - 240 V / 1 phase / 50 Hz rpm.
1. Specifications 1-2 Major Component Specifications (A) Indoor Unit MODEL No. SPW-T303G56 Source Remote Controller (Accessory) RCS - T251G Controller P.C.B. Ass’y RCS - 5PS3E CR - X363GS Switch Ass’y Fan (Number…diameter) SPW-T303GS56 220 - 230 - 240 V / 1 phase / 50 Hz – mm SW - X363GS Centrifugal (4...ø150) Fan Motor Model…Nominal output W Source No. of pole…r.p.m. (230 V, High) Coil resistance (Ambient temperature 20 °C) KFG4T - 41A5P...40 W 220 - 230 - 240 V / 1 phase / 50 Hz rpm. Ω 4.
1. Specifications 1-2 Major Component Specifications (A) Indoor Unit MODEL No. SPW-T363G56 Source Remote Controller (Accessory) RCS - T251G Controller P.C.B. Ass’y RCS - 5PS3E CR - X363GS Switch Ass’y Fan (Number…diameter) SPW-T363GS56 220 - 230 - 240 V / 1 phase / 50 Hz – mm SW - X363GS Centrifugal (4...ø150) Fan Motor Model…Nominal output W Source 1 No. of pole…r.p.m. (230 V, High) Coil resistance (Ambient temperature 20 °C) KFG4Q - 101D5P...100 W 220 - 230 - 240 V / 1 phase / 50 Hz rpm.
1. Specifications 1-2 Major Component Specifications (A) Indoor Unit MODEL No. SPW-T483G56 Source Remote Controller (Accessory) RCS - T251G Controller P.C.B. Ass’y RCS - 5PS3E CR - X363GS Switch Ass’y Fan (Number…diameter) SPW-T483GS56 220 - 230 - 240 V / 1 phase / 50 Hz – mm SW - X363GS Centrifugal (4...ø150) Fan Motor Model…Nominal output W Source No. of pole…r.p.m. (230 V, High) Coil resistance (Ambient temperature 20 °C) KFG4Q - 101D5P...100 W 220 - 230 - 240 V / 1 phase / 50 Hz rpm.
1. Specifications 1-2 Major Component Specifications (B) Outdoor Unit Model No. SPW-C253G5 SPW-C253G5/M Source SPW-C303G5 SPW-C303G5/M 220 - 230 - 240 V / 1 phase / 50 Hz Compressor Rotary (Hermetic) Model ... Code No. 1 C - R221H5V Nominal output W Compressor oil cc Coil resistance (at 25°C) Ω Refrigerant amount at shipment kg Safety device Operating temperature C - R240H5W 2,200 2,400 1,350 C - R : 0.76, C - S : 2.76 C - R : 0.69, R - S : 3.34, R22 - 2.4 R22 - 2.
1. Specifications 1-2 Major Component Specifications (B) Outdoor Unit MODEL No. SPW-C253G8, SPW-C253G8/M Source 380 - 400 - 415 V / 3 phase / 50 Hz Compressor Rotary (Hermetic) Model … Code No. C - R224H8S Nominal output W 2,200 Compressor oil CC 1,350 Coil resistance (at 25°C) Ω Refrigerant amount at shipment kg Safety device Overload relay models Operating temperature R - S : 5.54 , S - T : 5.54 , T - R : R22 – 2.
1. Specifications 1-2 Major Component Specifications (B) Outdoor Unit MODEL No. SPW-C363G8 SPW-C363G8/M Source 380 - 400 - 415 V / 3 phase / 50 Hz Compressor Rotary (Hermetic) Model...Code No. Scroll (Hermetic) C - R243H8T ZR61KC - TFD - 522 Nominal output W 2,400 3,750 Compressor oil cc 1,350 2,130 Coil resistance Ω T – R : 5.54 , R – S : 5.54 T1 – T2 : 2.72 , T2 – T3 : 2.72 S – T : 5.54 T3 – T1 : 2.
1. Specifications 1-3 Other Component Specifications (A) Indoor Unit MODEL No. SPW-T253G56 SPW-T303G56 Power Transformer Rated Primary 10.6 V, 0.93 A Capacity 9.86 VAC Ω Coil resistance Thermistor cut off temperature WHT – WHT : 101 , °C Thermistor (Coil sensor) BRN – BRN kΩ : 0.6 (at 20 °C) 150 PBC - 41E - S36 Coil resistance PBC - 41E - S35 –10°C : 23.7 , 5°C : 12.1 –5°C : 18.8 , 10°C : 9.7 0°C : 15.0 , 15°C : 8.0 Synchronized Motor 1 MC8 D MODEL No.
1. Specifications 1-3 Other Component Specifications (B) Outdoor Unit MODEL No. SPW-C253G5 SPW-C253G5/M SPW-C303G5 SPW-C303G5/M Compressor Motor Mgnetic Contactor FMCA - 1SZ607 Coil rated Coil resistance (at 20°C) Contact rated 1 AC 220 - 240 V, 50 Hz Ω 828 ± 15 % V, A AC 440 V, 13A Auxiliary relay HH62S / 085 Coil rated AC 240 V, 50 Hz Coil resistance (at 20°C) Contact rated kΩ 17.2 V, A AC 220 V, 5A Thermostat (Coil sensor) Operating Temperature YTB - S377 °C 27.5 ± 1.
1. Specifications 1-4 Dimensional Data D 748 1048 E 1190 1490 ø 15.88 ø 19.05 ø 6.35 ø 9.52 Ref.gas line Ref.
1. Specifications 1-4 Dimensional Data (B) Outdoor Unit : SPW-C253G5, SPW-C253G5/M SPW-C253G8, SPW-C253G8/M SPW-C303G5, SPW-C303G5/M 660 110 400 380 20 940 307 280 735 1 340 20 170 Dimension : mm Hole for anchor bolt (4-ø13) Refrigerant tube joint (narrow tube) Flare connection 1/4 in (6.35 mm) Refrigerant tube joint (wide tube) Flare connection 5/8 in (15.88 mm) Refrigerant tubing inlet Power supply inlet 0411_C_S Fig.
1. Specifications 1-4 Dimensional Data (B) Outdoor Unit : SPW-C363G5, SPW-C363G5/M SPW-C363G8, SPW-C363G8/M SPW-C483G8, SPW-C483G8/M 660 110 400 380 340 20 170 20 1 607 580 1235 940 Dimension : mm Hole for anchor bolt (4-ø13) Refrigerant tube joint (narrow tube) Flare connection 3/8 in (9.52 mm) Refrigerant tube joint (wide tube) Flare connection 3/4 in (19.05 mm) Refrigerant tubing inlet Power supply inlet 0412_C_S Fig.
1. Specifications 1-5 Refrigerant Flow Diagram Outdoor Unit : SPW-C253G5, SPW-C253G5/M SPW-C303G5, SPW-C303G5/M SPW-C253G8, SPW-C253G8/M Evaporator Wide tube service valve Accumulator Narrow tube service valve Strainer O. D. 6.35 mm (1/4") Condenser High pressure switch Capillary 1 O. D. 15.
1. Specifications 1-5 Refrigerant Flow Diagram Indoor Unit : SPW-T483GS56 SPW-T483G56 Outdoor Unit : SPW-C483G8, SPW-C483G8/M Compressor O. D. 19.05 mm (3/4") Condenser HP Accumulator High pressure switch Capillary Evaporator Wide tube service valve Narrow tube service valve Strainer O. D. 9.52 mm (3/8") 1 Sub-condenser 0606_X_S Fig. 5-2 1-6 Operating Range Temperature Cooling Indoor air intake temp. Outdoor air intake temp. Maximum 35°C DB / 22.
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2. Processes and functions 2. PROCESSES AND FUNCTIONS 2-1 2-2 2-3 Room Temperature Control .......................................................................... 30 Freeze Prevention ..........................................................................................31 Outdoor Fan Control ......................................................................................
2. Processes and functions 2-1 Room Temperature Control The Unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF. This process is controlled by the thermostat located in the remote control unit. The figures on this and the next pages show how each part of the system performs when the room temperature changes and the thermostat activates the compressor to start (thermo ON) or stop (thermo OFF). Fig. 6 shows about the cooling cycle.
2. Processes and functions 2-2 Freeze Prevention Freeze Prevention keeps the indoor heat exchange coil from freezing. Freezing reduces the efficiency of the unit, and frost buildup on the coil blocks cool air circulation from the indoor unit’s fan. FREEZE PREVENTION MORE THAN 10 MINUTES 6 MINUTES FREEZE PREVENTION 10 MINUTES 6 MINUTES INDOOR COIL TEMPERATURE (THERMO ON) –1°C (THERMO OFF) ON OFF ON OFF ON ON OFF ON OFF ON COMPRESSOR OUTDOOR FAN SET SPEED INDOOR FAN 0608_X_S Fig.
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3. Electrical data 3. ELECTRICAL DATA 3-1 3-2 Indoor Unit (Electric Wiring Diagram, Schematic Diagram) ............................... 34 Outdoor Unit (Electric Wiring Diagram, Schematic Diagram).............................
Terminal Plate(4P) SUP 5P(WHT) 1 3 5 WHT RED BRN 2 P S 1 3 1 2 1 2 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 3 5 7 DPH P S 1 2 1 2 Connector 2P(BLU) 3P (RED) DPH Controller (CR-X363GS) 1 3 P 1 2 Connector 2P(WHT) 1 3 Connector 8P(WHT) GRN/YEL COM M H L 49FMI FM 7P(WHT) 3P(WHT) S P FMI 1 3 3P (BLU) DP SEC 2P(WHT) PRY 2P(WHT) S 1 2 P TR 1 2 Connector 2P(BLK) 3P (RED) FS 3 4 BLU WHT 1 WHT WHT RC1 BRN BRN PNK GRN/YEL GRY GRY To Outdoor Unit Power Supply ORG VLT YEL YEL WHT E
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Terminal Plate(4P) 1 2 SUP 5P(WHT) 1 3 5 1 3 3P (RED) FS 3 4 P 1 2 Connector S 1 2 2P(BLK) RC1 FMI 49FMI 3P(WHT) 1 3 DPH 3P (RED) DPH Controller (CR-X363GS) COM M H L FM 7P(WHT) 1 3 5 7 P 1 2 Connector S 1 2 2P(BLU) 1 3 P 1 2 Connector 2P(WHT) GRN/YEL S 1 2 3 4 5 6 7 8 Connector P 1 2 3 4 5 6 7 8 8P(WHT) 1 3 3P (BLU) DP SEC 2P(WHT) PRY 2P(WHT) WHT WHT 1 2 S BRN BRN 1 2 P TR GRN/YEL GRY GRY To Outdoor Unit Power Supply BRN BRN PNK BLU WHT WHT RED BRN PNK BRN YEL ORG VLT
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Terminal Plate(4P) 1 2 SUP 5P(WHT) 1 3 5 1 3 3P (RED) FS 3 4 P 1 2 Connector S 1 2 2P(BLK) FMI 1 3 5 7 1 3 DPH 3P (RED) DPH Controller (CR-X363GS) COM M H L 49FMI FM 7P(WHT) 3P(WHT) P 1 2 Connector S 1 2 2P(BLU) 1 3 P 1 2 Connector 2P(WHT) GRN/YEL S 1 2 3 4 5 6 7 8 Connector P 1 2 3 4 5 6 7 8 8P(WHT) 1 3 3P (BLU) DP 1 2 SEC 2P(WHT) WHT WHT 1 2 S BRN BRN PRY 2P(WHT) P TR BRN BRN PNK BLU WHT WHT RED BRN RC1 GRY GRY GRN/YEL ORG VLT YEL YEL WHT E GRN/YEL BLK BLK BLK PNK
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Terminal Plate(4P) 1 2 SUP 5P(WHT) 1 3 5 1 3 3P (RED) FS 3 4 P 1 2 Connector S 1 2 2P(BLK) FMI 1 3 5 7 1 3 49FMI 3P(WHT) DPH 3P (RED) DPH Controller (CR-X363GS) COM M H L FM 7P(WHT) P 1 2 Connector S 1 2 2P(BLU) 1 3 P 1 2 Connector 2P(WHT) GRN/YEL S 1 2 3 4 5 6 7 8 Connector P 1 2 3 4 5 6 7 8 8P(WHT) 1 3 3P (BLU) DP 1 2 SEC 2P(WHT) WHT WHT 1 2 S BRN BRN PRY 2P(WHT) P TR RC1 GRY GRY GRN/YEL BRN BRN PNK BLU WHT WHT RED BRN PNK BRN YEL ORG VLT YEL YEL WHT E GRN/YEL BLK
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4. Service procedures 4. SERVICE PROCEDURES 4-1 Troubleshooting .............................................................................................56 (1) Check before and after Troubleshooting ................................................ 56 (2) Air conditioner does not operate ............................................................ 57 (3) Outdoor unit does not run ...................................................................... 61 (4) Indoor unit does not run .....................
4. Service procedures 4-1 Trobleshooting (1) Check before and after Troubleshooting Many problems may happen because of wiring or power supply problems, so you should check these areas first. Problems here can cause false results in some of the other tests, and so should be corrected first. 1 . Check power supply wiring (a) Single-phase ❑ Check that power supply wires are correctly connected to terminal No. 1 through No.
4. Service procedures (2) Air conditioner does not operate 1 Circuit breaker trips (or fuse blows). (a) When the circuit breaker is set to ON, it is tripped soon. • There is a possibility of ground fault. • Check insulation resistance. If resistance value is 1MΩ or less, it is a defect of insulation. (Example) Earth Remove power supply cords from the terminal plate in the outdoor unit. • Check insulation resistance of power supply cords. + Earth *Set the circuit breaker to OFF.
4. Service procedures (b) Circuit breaker trips in several minutes after turning the air conditioner on. • There is a possibility of short circuit. • Check capacity of circuit breaker. Replace it with a suitable one. (= larger capacity) NO Is capacity of circuit breaker sufficient ? • Check resistance of outdoor fan motor winding. • Check resistance of compressor motor winding. 0614_X_S 2 Neither indoor unit nor outdoor unit runs. A. Power is not supplied • Check power supply.
4. Service procedures C. Check “Operation selector” switch in the indoor unit. : In case of wireless remote control unit (GS type) • Has “Operation selector” switch been set to ON position ? IND. LAMP Ass’y or P.C.B. Ass’y in the indoor unit is defective. YES NO Set “Operation selector” switch to ON. But neither unit runs. Switch Ass’y or P.C.B. Ass’y in the indoor unit is defective. 0617_X_S D. Check compressor motor protectors.
4. Service procedures E. Check. auxiliary relay. (1Y or 2Y) • Check coil resistance of auxiliary relay. (1Y or 2Y) 0620_X_S F. Check indoor fan motor thermal protector (49FMI) • Disconnect the socket from 9P (WHT) connector. • Check the continuity between No. 8 and No.9 poles of the 9P socket. No continuity. The thermal protector (49FMI) is operated. • Check fan rotation. Rotate the fan gently once or twice by hand. Fan cannot be rotated. OK • Check fan motor capacitor.
4. Service procedures (3) Outdoor unit does not run. A. Check COOL/FAN selector switch in the remote control unit. • Is COOL/FAN selector switch NO set to COOL ? Set to COOL. 0623_X_S B. Check set temperature. Try to lower set temperature by Temperature setting button “COOLER”. YES • Set “Operation selector” switch to TEST in the indoor unit. Outdoor unit runs. Is room temperature too low ? NO • Try to run both indoor and outdoor units with another remote control unit.
4. Service procedures b) Check compressor motor thermal protector (49C) • Check compressor motor thermal protector. (49C) Is temperature of compressor abnormally high ? YES Refrigerant gas shortage. Charge refrigerant gas. NO Compressor is defective. 0626_X_S • Check compressor motor magnetic contactor. (52C) 0627_X_S (Only outdoor fan does not run.) D. Check indoor unit P.C.B. • Check P.C.B. Ass’y. • Check voltage between terminals No.2 and No.4 at terminal plate. No voltage appears. P.C.B.
4. Service procedures (4) Indoor unit does not run. (Indoor fan and louver motor do not run. P.C.B. Ass’y is defective. 0630_X_S (5) Some part does not operate. (1) Indoor fan does not run. • Check fan rotation. Rotate the fan gently once or twice by hand. Fan cannot be rotated. Check fan casing for foreign matter on the inside. Remove foreign matter or repair. Fan motor burnout or foreign matter in bearing. Repair or replace. • Check resistance of fan motor winding.
4. Service procedures (6) Outdoor fan does not run. • Check fan rotation. Rotate the fan gently once or twice by hand. Fan cannot be rotated. • Check fan casing for foreign matter on the inside. Remove foreign matter or repair. • Fan motor burnout or foreign matter in bearing. Repair or replace. • Check resistance of fan motor winding. OK • Check fan motor capacitor • Check continuity between terminals on the compressor motor magnetic contactor.
4. Service procedures (9) Poor cooling Check installation position of remote control unit. • Does cool air from air conditioner reach remote control unit directly ? • Is wide tube between indoor unit and outdoor unit insulated ? YES Change installation position of remote control unit. Insulate wide tube and then execute taping with narrow tube. NO YES • Measure temperatures of suction and discharge air of indoor unit. Temperature difference Possibility of is small. refrigerant shortage.
4. Service procedures (10) Excessive cooling. • The set temperature is too low. • Is the remote control unit installed at a place where it can detect the room temperature properly ? Set the temperature to higher value using temperature setting button of the remote control unit. YES Change installation position of the remote control unit.
4. Service procedures 4-2 A Sensor is Defective. 1 Indoor (heat exchanger) coil temp. Sensor is defective. (a) Open (=No continuity in sensor) Compressor and outdoor fan repeat ON for 10 minutes and OFF for 6 minutes when sensor opens. (b) Short “Freeze Prevention” does not operate when dehumidified water is frozen on the indoor coil. 2 Room temp. Sensor (in the remote control unit) is defective. (a) Open (=No continuity in sensor) Neither outdoor fan nor compressor runs.
4. Service procedures 4-4 Checking the Electrical Components (1) Earthed wire Measurement of Insulation Resistance Clip • The electrical insulation is acceptable when the resistance exceeds 1 MΩ. Probe Insulation tester 1 0638_X_S Power Supply Wires Clamp the earthed wire of the Power Supply wires with a lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the power wires. (Fig. 42) Fig.
4. Service procedures (2) Checking the Protective Devices • Disconnect the connector, which consists of P (plug) and S (socket) when you want to check the protective device. • Then check continuity among plug’s (and/or socket’s) terminal as in Fig. 46. • Normality of the protective device can be judged by the following table. The Protective Device is proved normal if there is a continuity between terminals. socket Multimeter Ω Fig. 46 0642_X_S 1 2 3 Indoor fan motor thermal protector (49FI) .
4. Service procedures (3) Checking the Electrical Parts 1 Power transformer (TR1) ................. Indoor unit *Measure the coil resistance. • Primary 220-240 V ; Measure the resistance between two WHT lead wire terminals of socket connected to power transformer. • Secondary 10.6V ; Measure the resistance between two BRN lead wires. Refer to “1–3–(A) Other component specifications”. 2 Indoor fan motor (FMI) ............... Indoor unit • *Measure the coil resistance.
4. Service procedures 5 Fuse on indoor P.C.B. Ass’y • Remove the P.C.B. Ass’y from the electrical component box. Then pull out the fuse from the P.C.B. Ass’y. (Fig. 48) Fuses Indoor P.C.B. Ass’y 0644_X_S Fig. 48 • The check for continuity of the fuse by using the multimeter. (Fig. 49) Having continuity is acceptable. Fuse 0645_X_S (4) Fig. 49 Thermistor Characteristic Curve 1 1 Room temp.
