... and low pressure protection of some refrigeration systems such as residential, commercial and automobile air-conditioners and ice makers, air compressors, ... and water heaters. It can also be used to pneumatic and hydraulic pressure control systems of ... by):1. Reset method: auto reset, manual reset2. Pressure range: extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low (3 ~ ...