... tube welding, copper flare fitting HVAC The pressure control is used for high and low pressure protection of some refrigeration systems, residential, ... by):1. Reset method: auto reset, manual reset2. Pressure range: extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low (3 ~ 145PSI), vacuum ... 15MPS350High Pressure350- -+/-15+/-15MPS450Manual Reset450- -+/-15+/-15 heat pump air compressor pressure switch