Can you judge whether the refrigeration compressor is leaking in 5 steps

Can you judge whether the refrigeration compressor is leaking in 5 steps

Insert the power plug of the air conditioner into the power source, and the air switch will trip immediately! Compressor leakage? Follow the following five steps to confirm the compressor leakage fault.

1. Measure the resistance of the power plug N and the ground

Just insert the plug of the air conditioner into the power socket, the air switch will be activated for protection. In order to judge whether the air conditioner or the air switch is faulty, use a multimeter to block the electricity and measure the resistance of the power plug N and the ground. Normally it should be infinite, and the measured resistance is about 100. It is determined that the air conditioner has a leakage fault.

2. Disconnect the wiring terminal of the outdoor unit

　　 The common leakage fault of the air conditioner is the outdoor unit. In order to judge whether the outdoor unit or the indoor unit is faulty, remove the 4 connecting wires except the ground wire from the outdoor unit wiring terminal, use a multimeter to block, connect one meter pen to the N terminal on the wiring terminal, and one meter pen ground terminal fixing screw. The resistance is still about 100, so it is determined that the fault is in the outdoor unit.

3. Measure the resistance of the compressor lead to the ground

　　Compressor is the common leakage fault of outdoor unit.

Unplug the 3 leads of the compressor coil and a total of 4 plugs (the blue wire of the N terminal is in parallel with the blue wire of the running winding), and use a multimeter to electrically block the resistance of the common black wire and the ground (connected to the four-way valve copper tube), normal The resistance should be infinite, but the measured resistance is still .13.50, indicating that the leakage fault is caused by the compressor.

　　4. Measure the resistance between the compressor terminal and ground

　　The melting of the compressor lead insulation layer and the ground short-circuit will also cause a power-on trip failure.

Remove the compressor wiring cover, check that the compressor leads are normal, unplug the connecting wire plug on the compressor wiring terminal, use a multimeter to electrically block the resistance of the common terminal (c) and ground (connected to the compressor exhaust pipe). The actual measurement is 13.50, which confirms that the compressor's internal coil is short-circuited to ground.

　　 5. Troubleshooting method when there is no multimeter

　　 If there is no multimeter or the multimeter is damaged and cannot be used during the on-site inspection, you can use the troubleshooting method to repair the fault in this example. The brief steps are as follows:

　　 1) Disconnect the 4 connecting wires at the outdoor unit wiring terminals, and insulate them, and power on and test the machine again. If the air switch does not trip anymore, it means that the fault lies in the outdoor unit.

　　 2) Restore the 4 connecting wires on the outdoor unit wiring terminals, and remove the 4 plugs of the 3 leads of the compressor in the electric control box, and power on the test machine again. If the air switch no longer trips, it means the compressor is faulty.

3)Restore the 4 plugs of the 3 leads of the compressor in the electric control box, and remove the 3 lead plugs of the compressor terminal, and power on the test machine again. If the air switch no longer trips, it can be determined that the compressor is damaged.

to sum up

　　 1. The air conditioner trips when it is powered on or after it is turned on. If it is a leakage fault, it is usually caused by a short circuit of the compressor coil to the ground. Others, such as short-circuit between indoor and outdoor machine connecting wires or peeling off of the insulation layer, melting of the compressor lead insulation layer and short-circuit to the ground, and damage to the air switch account for a small proportion.

　　 2. After the air conditioner is turned on, the air switch trips failure. If it is caused by excessive current, the common cause is that the compressor cylinder is stuck or the compressor capacitor is damaged.

　　3. Measure the resistance of the compressor coil to the ground. The copper tube and iron shell of the outdoor unit are directly connected to the ground. The resistance of the part to be measured and the copper tube can be measured on the actual test day.