TECHNICAL & SERVICE MANUAL ® ADR522CW AE522SC AE522SC3 / AER522SCL3 ADR522HW AE522HS AE522HS3 / AER522HS3 SPLIT SYSTEM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT 0.8180.225.
TABLE OF CONTENTS A OPERATIONS.................................................................................................................PAGE.....1 B SPECIFICATIONS..........................................................................................................................9 C MAJOR COMPONENT SPECIFICATIONS................................................................ .................15 D OTHERS COMPONENTE SPECIFICATIONS............................................................
A OPERATING RANGE Function Cooling Heating Temperature Maximum Indoor air intake temp. 35°C DB / 22°C WB Outdoor air intake temp. 46°C DB Minimum 19°C DB / 14°C WB,5 19°C DB Maximum 27°C DB / 19°C WB 24°C DB / 18°C WB Minimum – DB / – WB,5 –8°C DB / –9°C WB Referred to the systems - ADR522CW - AER522SCL3 only (3 phase and low ambient version) Function Cooling Temperature INDOOR UNIT OUTDOOR UNIT Indoor air intake temp. Outdoor air intake temp.
B SPECIFICATIONS 1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522CW AE522SC Power source 220 / 230 / 240V - 1 - 50 Hz PERFORMANCES COOLING BTU/h Capacity 21.500 W (Kcal/h) Air circulation (high - med - low) 6.300 (5.418) m3/h 1200 External static pressure (high speed) mm w.g. (Pa) Moisture removal 5 (49) at shipment - 10 (98) using the Booster cable l/h ELECTRICAL Umidità asportataRATINGS (alta velocità) 2.
1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522CW AE522SC3 Power source 400V - 3N - 50 Hz (4 wires) PERFORMANCES COOLING BTU/h Capacity 20.400 W (Kcal/h) Air circulation (high - med - low) 6.000 (5.160) m3/h 1200 External static pressure (high speed) mm w.g. (Pa) Moisture removal l/h ELECTRICAL Umidità asportataRATINGS (alta velocità) 5 (49) at shipment - 10 (98) using the Booster cable 2.
1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522CW AER522SCL3 Power source 400V - 3N - 50 Hz (4 wires) PERFORMANCES COOLING BTU/h Capacity 21.000 W (Kcal/h) Air circulation (high - med - low) 6.150 (5,335) m3/h 1200 External static pressure (high speed) mm w.g.
1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522HW AE522SH Power source 220 / 230 / 240V - 1 - 50 Hz PERFORMANCES BTU/h Capacity W (Kcal/h) Air circulation (high - med - low) COOLING HEATING 20.800 25400 6.100 (5246) 7.450 (6.407) m3/h 1200 External static pressure (high speed) mm w.g.
1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522HW AE522SH3 Power source 400V - 3N - 50 Hz (4 wires) PERFORMANCES BTU/h Capacity W (Kcal/h) Air circulation (high - med - low) COOLING HEATING 20.000 25.000 5.800 (4.988) 7.300 (6.278) m3/h 1200 External static pressure (high speed) mm w.g. (Pa) Moisture removal l/h ELECTRICAL Umidità asportataRATINGS (alta velocità) 5 (49) at shipment - 10 (98) using the Booster cable 2.
1) UNIT SPECIFICATIONS UNIT MODEL INDOOR UNIT OUTDOOR UNIT ADR522HW AER522SH3 Power source 400V - 3N - 50 Hz (4 wires) PERFORMANCES BTU/h Capacity W (Kcal/h) Air circulation (high - med - low) COOLING HEATING 19.500 26.000 5.700 (4.902) 7.400 (6.364) m3/h 1200 External static pressure (high speed) mm w.g. (Pa) Moisture removal l/h ELECTRICAL Umidità asportataRATINGS (alta velocità) 5 (49) at shipment - 10 (98) using the Booster cable 2.
C MAJOR COMPONENT SPECIFICATIONS d) INDOOR UNIT UNIT MODEL ADR522CW/ADR522HW Power source 220 / 230 / 240V -1 - 50 Hz REMOTE CONTROL UNIT CONTROLLER P.C.B. POW-U226QH Controls Microprocessor RCS-U186QH Control circuit fuse 250V - 3A FAN Centrifugal Number ... dia. / length mm 2 ... Ø 200 / L 230 FAN MOTOR Model ... Number K48415M01535 ... 1 Power source V 220 / 230 / 240-1-50 Hz No. di poli ... giri/min (230V-max) 4 ... 800 Nominal output W Coil resistance (Ambient temp.
Outdoor Unit AE522SH Controller PCB POW – C226GH Type Rotary (Hermetic) Compressor Compressor model C – R221H5S 80687145B Nominal output W 2,200 Compressor oil ... Amount cc 4GSD – T or SAY-56T ... 1,350 Coil resistance (Ambient temp. 25°C) Ω C – R : 0.78 C – S : 2.41 Type Safety devices Overload relay Operating temp. — OL– D24 °C Automatic opening 150 ± 5 Close °C Automatic reclosing 63 ± 11 — Trip in 6 to 16 sec. at 59 A Run capacitor µF 40.
Outdoor Unit AE522SH3 380 - 400 V - 3N ~ 50 Hz 220 - 240 V ~ 50 Hz POW-C226GH Power source Control circuit CONTROLLER PCB COMPRESSOR Type Compressor model Source Nominal output Compressor oil ... Amount C-R C-S R-S Coil resistance (Ambient temp. 25°C) Safety devices: Type Overload relay Open Close Operating amp. (Ambient temp. 25°C) Operating temp. °C °C µF VAC Run capacitor Crank case heater FAN AND FAN MOTOR Type Number ... Dia. Fan motor model ... Number Source No. of poles ...
Outdoor Unit AER522SH3 380 - 400 V - 3N ~ 50 Hz 220 - 240 V ~ 50 Hz POW-C226GH Power source Control circuit CONTROLLER PCB COMPRESSOR Type Compressor model Source Nominal output Compressor oil ... Amount C-R C-S R-S Coil resistance (Ambient temp. 25°C) Safety devices: Type Overload relay Open Close Operating amp. (Ambient temp. 25°C) Operating temp. °C °C µF VAC Run capacitor Crank case heater FAN AND FAN MOTOR Type Number ... Dia. Fan motor model ... Number Source No. of poles ...
Outdoor Unit AE522SC Controller PCB — Type Rotary (Hermetic) Compressor Compressor model C – R221H5S 80687145B Nominal output W 2,200 Compressor oil ... Amount cc 4GSD – T or SAY-56T ... 1,350 Coil resistance (Ambient temp. 25°C) Ω C – R : 0.78 C – S : 2.41 Type Safety devices Overload relay Operating temp. — OL– D24 °C Automatic opening 150 ± 5 Close °C Automatic reclosing 63 ± 10 — Trip in 6 to 16 sec. at 57 A Run capacitor µF 40.
Outdoor Unit Controller PCB AE522SC3 Part No. Johnson Control Type Rotary (Hermetic) Compressor model C-R223H8S - 806187188B 380 – 400 V – 3N ~ 50 Hz Source Nominal output W 2200 Compressor oil ... Amount cc SUNISO 4GSD-T ... 1350 Coil resistance (Ambient temp. 25°C) Ω C – R : 4.97 Compressor C – S : 4.64 R – S : 4.88 Type Safety devices Internal protector Overload relay Operating temp.
Outdoor Unit AER522SCL3 Controller PCB Part No. Johnson Control Type Rotary (Hermetic) Compressor model C-RN223H8A 80244088B 380 – 400 V – 3N ~ 50 Hz Source Nominal output W 2200 Compressor oil ... Amount cc FV68S ... 1350 Coil resistance (Ambient temp. 25°C) Ω C – R : 4.97 Compressor C – S : 4.64 R – S : 4.88 Type Safety devices Internal protector Overload relay Operating temp.
D OTHER COMPONENT SPECIFICATIONS Outdoor Unit AE522SC Power Relay G7L-2A-TUB Coil rating AC 200 – 240V, 50/60Hz Coil resistance kΩ (at 23°C) ( 21 ± 15% ) Contact rating AC 220V, 25A Thermostat (Fan Speed Control 23S) Switching temp. MQT5S-27YZJ °C Contact rating Outdoor Unit high ➞ LOW +0 23.5°C –2.5 low ➞ HIGH 27.0°C +0 –3 AC 220V, 3A AE522SC Thermostat (Fan Speed Control 23S) Switching temp. YTB-S383 °C Magnetic Contactor (MG) 28.
Outdoor Unit AE522SC3 Electro Magnetic Contactor (MG) HOE-10TB TH-7A Magnetic Contactor Coil rating Coil resistance AC 220–240V, 50Hz / AC 240–260V, 60Hz Ω (at 25°C) 1,260 ± 10% Contact rating (Main) AC 440V, 8A Thermal relay (Overcurrent relay) Operating amperes 7A Negative Phase Relay (47C) RDR-S400 Rating AC 415V, 3-phase 50Hz Contact rating AC 400V, 1A Operation Positive phase: ON Negative phase: OFF YTB-S383 Thermostat (Fan Speed Control 23S) Switching temp. °C 16 high → LOW 28.
Outdoor Unit AER522SCL3 Electro Magnetic Contactor (MG) HOE-10TB TH-7A Magnetic Contactor Coil rating Coil resistance AC 220–240V, 50Hz / AC 240–260V, 60Hz Ω (at 25°C) 1,260 ± 10% Contact rating (Main) AC 440V, 8A Thermal relay (Overcurrent relay) Operating amperes 7A Negative Phase Relay (47C) RDR-S400 Rating AC 415V, 3-phase 50Hz Contact rating AC 400V, 1A Operation Positive phase: ON Negative phase: OFF YTB-S383 Thermostat (Fan Speed Control 23S) Switching temp. °C high → LOW 28.
Outdoor Unit AE522SH Magnetic Contactor (MG) HE-20FT31B Coil rating Coil resistance AC 220/240 V,50Hz Ω (at 25°C) 1.050 ± 15% Contact rating (Main) AC 220V, 20A Thermostat (Defrost thermo. 23D) Operating temp. TRS02-12MSR316 °C Thermostat (Fan Speed Control 23S) Switching temp. ON 12 ± 2 Diff. 8 deg. below YTB-S383 high ➞ LOW 28.5°C ± 1 °C low ➞ HIGH 4-way Valve (20S) LB64012 (Coil), V26-110B (Valve) Coil rating Coil resistance 31°C ± 1 AC 220-240V, 50Hz, 6W Ω (at 20°C) 1.
Outdoor Unit AE522SH3 Electro Magnetic Contactor (MG) HOE-10TB TH-7A Magnetic Contactor Coil rating Coil resistance AC 220–240V, 50Hz / AC 240–260V, 60Hz Ω (at 25°C) 1,260 ± 10% Contact rating (Main) AC 440V, 8A Thermal relay (Overcurrent relay) Operating amperes 7A Negative Phase Relay (47C) RDR-S400 Rating AC 415V, 3-phase 50Hz Contact rating AC 400V, 1A Operation Positive phase: ON Negative phase: OFF 4-way Valve (20S) LB64012 (Coil), V26-110D (Valve) Coil rating Coil resistance AC
Outdoor Unit AER522SH3 Electro Magnetic Contactor (MG) HOE-10TB TH-7A Magnetic Contactor Coil rating Coil resistance AC 220–240V, 50Hz / AC 240–260V, 60Hz Ω (at 25°C) 1,260 ± 10% Contact rating (Main) AC 440V, 8A Thermal relay (Overcurrent relay) Operating amperes 7A Negative Phase Relay (47C) RDR-S400 Rating AC 415V, 3-phase 50Hz Contact rating AC 400V, 1A Operation Positive phase: ON Negative phase: OFF 4-way Valve (20S) LB64012 (Coil), V26-110D (Valve) Coil rating Coil resistance AC
21 Dimension: mm Refrigerant liquid line (Narrow tube - ø 6.35) Refrigerant gas line (Wide tube - ø 15.88) Drain connection (outside diam.
Outdoor Unit Air intake 325 20 20 Air discharge 620 100 Wide tube service valve ø15.88 (5/8") 6 – ø3.1 holes 285 229 57 835 560 250 Narrow tube service valve ø6.
F FUNCTION 1) ROOM TEMPERATURE CONTROL Cooling • Room temperature control is obtained by cycling the compressor ON and OFF under control of the room temperature sensor in the remote control unit.
Heating MORE THAN 5 MINUTES THERMO OFF THERMO ON THERMO OFF SET TEMP. T°C T-0.5°C ROOM TEMP. 5 MINUTES 5 MINUTES OFF ON OFF ON OFF OUTDOOR FAN OFF ON OFF ON OFF INDOOR FAN OFF COMPRESSOR 30 SECONDS LL SET SPEED LL ❆ STANDBY LAMP OFF ON 30 SECONDS SET SPEED ❆ OFF LL ❆ OFF ON ON INDOOR HEAT EXCH. COIL TEMP.
2) FREEZE PREVENTION (COOLING) • This function prevents freezing of the indoor heat exchange coil. • When the compressor has been running for 10 minutes or more and the temperature of the indoor heat exchange coil falls below –1°C, the control circuit stops the compressor for at least 6 minutes. THERMO OFF THERMO ON ROOM TEMP. SET TEMP. T +0.5°C T°C INDOOR HEAT EXCH. COIL TEMP.
For indoor units ADR522HW only INDOOR HEAT EXCH. COIL TEMP. °C 59 49 INDOOR FAN COMPRESSOR HoMoL H ➔ H, ON M ➔ M, L ➔ M H = High speed M = Medium speed L = Low speed • When the temperature of the indoor heat exchange coil rises above 59°C, and if the indoor fan is L (low speed), then the fan speed changes from L (low speed) to M (medium speed).
4) DEFROSTING OPERATION (Heating) • When the capacity of the unit has been decreesed due to frosting up of the outdoor heat exchanger during heating, the temperature drop gradient is detected by the microcomputer-controlled temperature sensing system, and defrosting operation is started.
5) DEFROSTING MODE TIMING CHART START OF DEFROSTING RELEASE OF DEFROSTING MAX. 11 MINUTES 32 SECONDS COMPRESSOR ON OUTDOOR FAN ON OFF ON 32 SECONDS OFF ON OFF ON 2 SECONDS SOLENOID COIL (4-WAY VALVE) INDOOR FAN 2 SECONDS ON OFF SET SPEED OFF STANDBY LAMP ON OFF ON LL ON SET SPEED OFF ON INDOOR HEAT EXCH. COIL TEMP.
REFRIGERANT FLOW DIAGRAM Indoor Unit ADR522CW Outdoor Unit Indoor Unit Wide tube Wide tube service valve Muffler O.D. ø15.88 mm (5/8 ") Indoor Unit AE522SC AE522SC3/AER522SCL3 Outdoor Unit Accumulator Compressor Condenser Capillary for liquid injection Evaporator G Narrow tube Narrow tube service valve O.D. ø6.
3) For AER522SCL3 only (3 phase and low ambient version) • When the outside ambient temperature decreases, the rotation speed of the outdoor fan is regulated by means of the outdoor heat-exchanger sensor to prevent liquid back. • The rotation speed varies with indoor temperature conditions (Hatching area). • The unit is protected against high pressure by means of the outside temperature sensor, and thus when the outside ambient temperature reaches 30 ° C respectively, the fan speed is forced to high.
ELECTRIC DIAGRAMS ADR522CW ADR522HW TP1 BLK BLK 1 WHT 2 GRN/YEL ORG 4 E RED RY BRN GRY GRY 1 1 2 2 VLT ORG YEL BLK 6 5 4 3 2 1 BLK BLK UNIT BRN BRN 6 5 4 3 2 1 VLT ORG YEL BLK BRN 4 9 1 TH1 (COIL) WHT TH 1 1 2 2 WHT SUP 12P PNK GRY 9 9 GRY 8 8 WHT 7 7 VLT 6 6 ORG 5 5 YEL 4 4 BLK 3 3 BRN 2 2 PNK 1 1 1 2 3 4 1 2 3 4 1 1 2 2 TH2 (ROOM) 1 1 BODY THERMO 2 2 12 BLK BLK 1 1 WHT PR 2 2 WHT FMI TR 235V P-C C1 FMI PCB1 GRN/YEL S-0 19V GRN/YEL E LFS BLK 1 1 BLK 2 2 BLK BLK REMOCON
Outdoor Unit AE522SH AE522SH3 AER522SH3 32
AE522SC AER522SCL3 TP2 GRY 1 GRY GRY 4 BRN L1 S WHT L2 C 47C L3 R T B A N CC 13 U V W 14 MG B C2 8 R WHT YEL BRN PNK GRY W BLU U WHT YEL 7 RED GRY S T FMO CM GRN/YEL GRN/YEL 33 GRY T THERMO S ORG BLK R WHT YEL A GRY BLU RED RED RED BLU WHT RED GRY BRN PNK 2 GRN/YEL GRN/YEL Outdoor Unit
H TROUBLESHOOTING HEATING MODEL 1) CHECK BEFORE AND AFTER “TROUBLESHOOTING” a) Check power supply wiring. • WARNING: If the following troubleshooting must be done with power being supplied, be careful about any uninsulated live part that can cause ELECTRIC SHOCK. • Check that power supply wires are correctly connected to terminals: Single-phase system –No. 1 and No. 2 on the terminal plate in the outdoor unit. Three-phase system – A D R 5 2 2 H W / A E 5 2 2 S H 3 - A E R 5 2 2 S H 3 No. 8,9,10 and No.
(c) Check power supply • Check that voltage is in specified range (± 10% of the rating). • Check that power is being supplied Single-phase systems Three-phase systems L L1 400V 230V L2 400V 400V N L3 N (d) Check lead wires and connectors in indoor and outdoor units. • Check that coating of lead wires is not damaged. • Check that lead wires and connectors are connected firmly. • Check that wiring is correct.
2) SYSTEMATIC CHART OF “TROUBLESHOOTING” Air conditioner does not operate. Circuit breaker trips (or fuse blows). Neither indoor unit nor outdoor unit runs. When circuit breaker is set to ON, it trips in a few moments. Measure insulation resistance of power supply wires. Circuit breaker trips in several minutes after turning air conditioner ON. Check capacity of circuit breaker. Meaure resistance of electrical components. Power is not supplied. Check power supply.
3) AIR CONDITIONER DOES NOT OPERATE (a) Circuit breaker trips (or fuse blows) • When circuit breaker is set to ON, it trips in a few moments. (Resetting is not possible). • Measure insulation resistance there is a possibility of ground fault. If resistance value is 1MΩ or less, insulation is defective.
• Set circuit breaker to OFF. ➀ • ➁ • ➂ • ➃ Remove power supply wires from terminal plate in outdoor unit. Measure insulation resistance of power supply wires. OK Do rewiring Remove inter-unit wires from terminal plate in outdoor unit. Measure insulation resistance of outdoor unit. Insulation of outdoor unit is defective. YES Measure insulation resistance of electrical parts in outdoor unit. Remove inter-unit wires from terminal plate in intdoor unit.
(b) Circuit breaker trips in several minutes after turning air conditioner ON. • There is a possibility of short circuit. Check capacity of circuit breaker. Capacity of circuit breaker is suitable? NO Replace it with suitable one. (larger capacity). YES In case of Heating operation: Measure resistance of 4-way valve’s winding. (20S or SC). Measure resistance of outdoor fan motor winding. OK Measure resistance of outdoor fan motor winding.
(d) Check fuse on PCB Ass’y in indoor unit Check fuse on PCB Ass’y in indoor unit for continuity. If fuse blows, there is a possibility of short circuit. Measure resistance of primary winding of transformer. Measure coil resistance of power relay or magnetic contactor in outdoor unit. OK Measure resistance of indoor fan motor winding. OK OK Measure resistance of drain pump winding. e) PCB Ass’y in indoor unit is defective. Check transformer in indoor unit Check whether transformere is detective.
L SOME PARTS OF AIR CONDITIONER DO NOT OPERATE 1) ONLY INDOOR FAN DOES NOT RUN Check fan rotation. Turn fan gently once or twice by hand. Fan cannot be turned Fan turn normal Check fan motor capacitor. NO Check fan casing for foreign matter on inside. Remove foreign matter or repair. Fan motor burnout or foreign matter in bearing. Repair or replace. Replace capacitor. OK Measure resistance of fan motor winding. NO Replace fan motor. OK Check output of fan motor terminals on PCB Ass’y.
3) ONLY COMPRESSOR DOES NOT RUN a) Single phase systems 230V - 1 - 50 Hz Measure resistance of compressor motor winding. OK Check compressor motor capacitor. (Either C1 or BC). OK Check power supply voltage. Voltage is abnormally low. Contact power utility company to have power voltage restored to normal YES 90% or more of rated voltage. NO Check compressor. There is a possibility of locked rotor. Either overload relay or internal protector is working. (Either OLR or 49C).
b) Three-phase systems 400V - 3N - 50 Hz Check negative phase relay (47C) to see if it has operated. YES Rewire power supply wires. NO Check magnetic contactor. (MG) O.K. Check thermal relay (51C) to see if it has operated. YES Check power supply voltage. Voltage is abnormally low. NO Contact power utility company to have power voltage restored to normal YES 90% or more of rated voltage. Check compressor. There is a possibility of locked rotor. Check compressor motor internal protector.
M AIR CONDITIONER OPERATES, BUT ABNORMALITIES OCCUR a) POOR COOLING OR POOR HEATING Refrigerant flow failure Check installation position of YES Change installation position of remote control unit. remote control unit. Does cool or heat air from air conditioner reach position directly? Is heating or cooling load too large? Review heating or cooling load estimate. 4 way valve is defective. Replace.
N TROUBLESHOOTING COOLING MODEL 1) CHECK BEFORE AND AFTER “TROUBLESHOOTING” a) Check power supply wiring. • WARNING: If the following troubleshooting must be done with power being supplied, be careful about any uninsulated live part that can cause ELECTRIC SHOCK. b) Check inter-unit wiring. • Check that inter-unit wiring (both the power wiring and control wiring) is correctly connected to the indoor unit from the outdoor unit.
2) SYSTEMATIC CHART OF “TROUBLESHOOTING” Air conditioner does not operate. Circuit breaker trips (or fuse blows). Neither indoor unit nor outdoor unit runs. When circuit breaker is set to ON, it trips in a few moments. Measure insulation resistance of power supply wires. Circuit breaker trips in several minutes after turning air conditioner ON. Check capacity of circuit breaker. Meaure resistance of electrical components. Power is not supplied. Check power supply.
3) AIR CONDITIONER DOES NOT OPERATE (a) Circuit breaker trips (or fuse blows) • When circuit breaker is set to ON, it trips in a few moments. (Resetting is not possible). • Measure insulation resistance there is a possibility of ground fault. If resistance value is 1MΩ or less, insulation is defective.
(b) Circuit breaker trips in several minutes after turning air conditioner ON. • There is a possibility of short circuit. Check capacity of circuit breaker. Capacity of circuit breaker is suitable? NO Replace it with suitable one. (larger capacity). YES Measure resistance of compressor motor winding. OK Measure resistance of outdoor fan motor winding. Outdoor unit AE522SC AE522SC3/AER522SCL3 only Measure coil resistance of magnetic contactor.
(d) Check fuse on PCB Ass’y in indoor unit Check fuse on PCB Ass’y in indoor unit for continuity. (F) If fuse blows, there is a possibility of short circuit. Measure resistance of primary winding of transformer. (TR) Measure coil resistance of power relay or magnetic contactor in outdoor unit. (PR - MG - 52C) OK Measure resistance of indoor fan motor winding. (FMI) OK OK Measure resistance of drain pump winding. e) PCB Ass’y in indoor unit is defective.
• Check magnetic contactor (only for AE522SC - AE522SC3 ) • Check coil resistance of magnetic contactor. (52C or MG) • Check negative phase relay (only for AER522SCL3 - AE522SC3) • Check negative phase relay to see if it has operated. (47C) YES • Rewire power supply wires. 5) COMPRESSOR MOTOR DOES NOT RUN (only for SAP AE522SC) a) Single phase systems 230V - 1 - 50 Hz • Check compressor motor capacitor. (C1) • Check overload relay and/or compressor motor internal protector.
b) Three - phase systems 400V - 3N - 50 Hz • Measure resistance of compressor motor winding. Is temperature of compressor abnormally high? YES Is outdoor heat exchanger coil dirty or are there obstacles near air suction inlet? NO Refrigerant gas shortage. YES YES Charge refrigerant gas. R22 or R407C. Clean heat exchanger or remove obstacles. • Check compressor motor overcurrent relay (51C). It’s operated • Check power supply voltage.
O SOME PARTS OF AIR CONDITIONER DO NOT OPERATE 1) ONLY INDOOR FAN DOES NOT RUN Check fan rotation. Turn fan gently once or twice by hand. Fan cannot be turned Fan turn normal Check fan motor capacitor. NO Check fan casing for foreign matter on inside. Remove foreign matter or repair. Fan motor burnout or foreign matter in bearing. Repair or replace. Replace capacitor. OK Measure resistance of fan motor winding. NO Replace fan motor. OK Check output of fan motor terminals on PCB Ass’y.
P AIR CONDITIONER OPERATES, BUT ABNORMALITIES OCCUR a) POOR COOLING Check installation position of remo- YES Change installation position of te control unit. remote control unit. Does cool air from air conditioner reach position directly? Is cooling load too large? Review cooling load estimate. Refrigerant flow failure Temperature diffeMeasure temperatures of rence is small Possibility of suction and discharge air gas shortage. of air conditioner.
QP CHECKING ELECTRICAL COMPONENTS 1) Measurement of Insulation Resistance • The insuration is in good condition if the resistance exceeds 1 MΩ. (a) Power Supply Wires Clamp the earthed wire of the power supply wires with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the power wires (Fig. 1). Then measure the resistance between the earthed wire and the other power wires (Fig. 1).
2) Checking Continuity of Fuse on PCB Ass’y • Remove PCB Ass’y from electrical component box. Then pull out the fuse from PCB Ass’y (Fig. 5). • Check continuity of fuse by the multimeter (Fig. 6). 3) Checking Motor Capacitor Remove the lead wiers from the capacitor terminals, and then place a probe on the capacitor terminals as shown in Fig. 7. Observe the deflection of the pointer, setting the resistance measuring range of the multimeter to the maximum value.
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