PowerAir Thermal Overload Switch Test and Repair
Compressor motors are thermally protected with automatic reset and may restart without warning.
PowerAir® compressors motors are thermally protected also the control circuit contains an automatic reset which shuts motors down if the ambient temperature becomes too high. The switch is located on the saddle behind and below the compressor heads.
Thermal Overload Switch Testing
To avoid compressor overheating and thermal shutdowns, equipment room must be properly ventilated. Ambient temperature should not exceed 104° Fahrenheit / 40° Celsius.
1.Disconnect power to the compressor.
2.Access electrical box. Refer to: Electrical Box Cover
3.Test continuity. Set meter to Ω. Disconnect switch at Transformer. Place meter probes on ends of switch.
|
Meter Reading |
Status |
Required Action |
|---|---|---|
|
O or Open Reading |
|
Replace Switch |
|
Start Low and Increases |
|
Switch Ok |
