Operating on a standard 24-volt AC control circuit

or SPDT switching unit

Common symptoms include the fan or pump failing to engage despite a call for heat

Designed for durability in demanding commercial

Smith boilers

Johnson Controls P70MA-2 Pressure Control Els PW 17895 Operating on a standard 24-voltThe Johnson Controls P70MA 2 Pressure Control is a heavy duty dual pressure switch engineered specifically for ammonia refrigeration systems (R 717). This SPST switching control integrates both high and low side protection into a single, ruggedized all steel enclosure, meeting the demands of commercial and industrial ammonia plants. The low pressure side features a wide adjustment range from 20" Wc to 100 psi with a tunable 7 psi to 50 psi