Wall Mounted J series Troubleshooting WMJ Training Troubleshooting

Wall Mounted J series Troubleshooting WM-J Training

Troubleshooting area Electrical circuit / hardware WM-J Training Refrigerant circuit / component

Troubleshooting - electrical Topics: • Measuring equipment • Unit fails to start • Error codes WM-J Training

Troubleshooting – electrical Equipment: • Clamp meter • Multi-meter • Thermocouple reader WM-J Training Measuring equipment

Troubleshooting - electrical • Diagnostic Flow Chart Not applicable 1 WM-J Training Unit fails to start

Troubleshooting - electrical • Diagnostic Flow Chart 1 Not applicable WM-J Training Unit fails to start

Troubleshooting - electrical • Power supply Power source: 220 -240 V Rated running current: 0. 17 A WM-J Training Unit fails to start

Troubleshooting - electrical • Fuse 1. Continuity check 2. Component shorted 3. Loose connection WM-J Training Unit fails to start

Troubleshooting - electrical • ID fan motor Black wire WM-J Training Unit fails to start

Troubleshooting - electrical • ID fan motor electrical data 230 V / Single phase WM-J Training Unit fails to start

Troubleshooting - electrical • OD fan motor cooling model WM-J Training Unit fails to start

Troubleshooting - electrical • OD fan motor – heat pump Model Running Current (A) Input Power (W) (5)WM 15 J/JR - (5)SL 15 C/CR 0. 26 59 5 WM 10 J/JR - 5 SL 10 C/CR 0. 23 52 WM 09 J/JR - SL 09 C/CR 0. 20 45 WM-J Training Unit fails to start

Troubleshooting - electrical • Compressor winding resistance Remove the cap C – Common Main – C & S S – Starting Auxiliary – R & C R – Running WM-J Training Unit fails to start

Troubleshooting - electrical • Compressor winding resistance 1. Measure resistance value - main - auxiliary 2. Continuity check – if “BEEP” sound is obtained > component short WM-J Training Unit fails to start

Troubleshooting - electrical • Compressor winding resistance Model Compressor model WM 09 J/JR SL 09 C/CR Single phase ± 7% Main ( ) Aux ( ) 2 PS 156 D 3 CD 02 3. 841 4. 021 WM 15 J/JR SL 15 C/CR 2 PS 206 D 2 AF 02 2. 893 4. 800 5 WM 10 J/JR 5 SL 10 C/CR 5 PS 102 DAL 01 3. 863 3. 309 5 WM 15 J/JR 5 SL 15 C/CR 5 PS 132 DBC 01 2. 647 4. 721 WM-J Training Unit fails to start

Troubleshooting - electrical • LED error indicators WM-J Training Error codes

Troubleshooting - electrical • Room sensor contact open/short Blink 1 time Sensor RTH 201 1. Possibility – low 2. Unit design with air opening at the front panel to allow sufficient space for air flow & measurement 3. 10 C < operating temp. < 40 C WM-J Training Error codes

Troubleshooting - electrical • ID coil sensor open/short Blink 2 times + Blinking - 10 C < operating temp. < 68 C WM-J Training Error codes

Troubleshooting - electrical • OD coil sensor open/short Blink 3 times - 10 C < operating temp. < 68 C WM-J Training Error codes

Troubleshooting- mechanical Charging Method Diagram shows typical charging method. WM-J Training Refrigerant circuit checks

Troubleshooting- mechanical • Pressure gauge WM-J Training

Troubleshooting- mechanical • Pressure measurement Both valve closed WM-J Training

Troubleshooting- mechanical • Charging refrigerant LP valve close, HP valve open WM-J Training LP valve open, HP valve close

Troubleshooting - mechanical Vacuuming Method 1) Open the service port core cap. 2) Connect pressure gauge to the service port. 3) Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum to – 0. 1 MPa (-760 mm. Hg) or lower. (Evacuation time varies by the pump but averagely in 1 hour). WM-J Training Refrigerant circuit checks

Troubleshooting- mechanical • Vacuum pumping Valve open WM-J Training

Troubleshooting-mechanical • Compressor Overload LED display - Blink 1 time (Cooling) When OD coil temperature > 68 °C, both the compressor and outdoor fan will stop operating. (Heating) When ID coil temperature > 68 °C, the compressor, outdoor fan and 4 way valve will stop operating. WM-J Training

Troubleshooting-mechanical Measure ID/OD on coil temperature > 68°C ? YES NO NO Sufficient airflow? YES Ensure no obstacle around the unit and conduct inspection on coil and filter. NO Connect correctly and operate again. Is the coil sensor correctly connected? YES NO Is the coil sensor resistance characteristics normal? Replace sensor. YES 2. 5 – 4 Ampere? Measure comp running amp. Within spec? NO NO Measure compressor winding resistance. Within spec ? Change compressor. NO Is compressor short body? YES Compressor OK YES Change compressor. Suction = 116 -154 psig Discharge = 297 -523 psig NO Measure suction pressure. Within spec? YES WM-J Training System ok. Unit overcharged. Recover all gas. Recharging with correct amount of refrigerant.

Troubleshooting-mechanical • Gas Leak LED display - Blink 3 times After compressor’s run time of 30 minutes is achieved, gas leak is declared if: ID coil temperature > 25°C (cooling) or < 20°C ( heating ) WM-J Training

Troubleshooting-mechanical Turn on the unit NO Is the coil sensor correctly connected? Connect correctly and operate again. YES NO Is the coil sensor resistance characteristics normal? Replace sensor. YES NO 2. 5 – 4 Ampere? Measure compressor running ampere. Within spec? Measure compressor winding resistance. Within spec ? NO Change compressor. NO Is compressor short body? YES Compressor OK YES Change compressor. NO Suction = 116 -154 psig Discharge = 297 -523 psig Measure suction pressure. Within spec? NO Detect the leak point? YES System ok. WM-J Training Fix the leak point. Refer to leak detection method.

Troubleshooting- mechanical • Hardware Error (tact switch pin open) LED display - Blink 6 times Possible root cause: ON/OFF tact switch accidentally pressed by front cover and could not restore back to normal position. WM-J Training

Troubleshooting- mechanical Visual inspection on the ON/OFF. NO ON/OFF pressed by cover? YES Press once on the ON/OFF button for 1 second. WM-J Training

Troubleshooting- mechanical • No feedback from indoor fan motor LED display OFF + Blink 4 times Possible root cause: Incorrect fan motor wire connection / defective fan motor. WM-J Training

Troubleshooting- mechanical Check fan motor wire connection. Correct? YES ` Check fan motor and replace with another motor. WM-J Training NO Reconnect in correct position.

Thank You WM-J Training