What is the minimum resistance from a motor winding to the compressor housing?

The minimum resistance from a motor winding to the compressor housing is crucial because it helps ensure that the motor is properly insulated and can operate safely without risk of shorting to the compressor case. A resistance of 1 million ohms is generally considered a benchmark in HVAC systems, indicating that the insulation of the windings is intact and exhibits good dielectric strength.

If the resistance value is lower than this threshold, it may suggest insulation breakdown or degradation, which can lead to electrical leakage or short circuits. Such conditions not only compromise the efficiency of the compressor but can also pose safety hazards. Therefore, achieving a measurement of at least 1 million ohms reflects that the motor is healthy and can perform as designed without electrical faults, providing confidence in system reliability.