Nemas Corp LLC

1. Check the compressor line sequence, C end (black line) is connected with T2 of AC contactor; R end (blue line) is connected with T1 of AC contactor; S end (red line) is connected with capacitor, and the other end of capacitor is connected with T1 of AC contactor;

2. If the line sequence is OK, remove the compressor power line from the electric control board and measure the resistance between the terminals of the compressor. If R-S is a, R-C is B, and S-C is C, then A ≈ B + C; (Note: under normal conditions, A / B / C is less than 10 Ω)

1. Check whether the power line L1 and L2 (i.e. between AC contactor L1 and L2) is about 230V; whether the voltage between Y and C is about 24V;

2. If the power supply is OK, check whether the voltage between the AC contactor T1 and T2 is about 230V, and whether the voltage between A1 and A2 is about 24V;

3. If the voltage between T1 and T2 of AC contactor is 0 and the voltage between A1 and A2 is about 24 V, the AC contactor should be damaged;

4. If the voltage between T1 and T2 of AC contactor is 0, and the voltage between A1 and A2 is 0, HP (high voltage switch) or FT (exhaust temperature switch) is damaged. If the resistance of the two is measured under normal temperature, the device with infinite resistance is the damaged device.