Robertshaw Freezestat Series Temperature Controls A22-2237

These controls are designed to shut down a piece of equipment if the operating conditions begin to approach freezing (as water freezes it expands and will rupture the chiller barrel tubes). The 016-264 has a manual reset feature, necessitating human intervention in the event of a shutdown.

Type P32 Low Pressure Limit Control
The Ranco P32 low pressure control provides freeze protection for low refrigerant protection on chillers and other refrigeration systems by sensing suction pressure. It is suitable for R12, R22 and R502 refrigerants. A time delay is provided to allow for startup in low ambient and momentary low pressure conditions during the run period. The timer is of the heated bimetal (warp) switch design with an ambient temperature compensator. Once the time delay period (standard is 120 seconds) has elapsed, the manual reset button must be depressed to restart the compressor. A five minute cool-down period is required before resetting.