Resideo PA404A1033/U Pressuretrol Controller with Additive 1 to 5 psi Differential Pressure

Resideo PA404A1033/U Pressuretrol Controller with Additive 1 to 5 psi Differential Pressure The PA404 is a series 40 (2-wire, SPST) Pressuretrol controller for use in 24, 120, 240, or 277 V control circuits or in self-powered (millivoltage) applications. FEATURES The PA404A is a pressure actuated high limit, safety control for steam heating boilers. It breaks an electrical circuit to shut down the burner if steam pressure rises above a safe level. Each model contains an SPST MICRO SWITCH snap-acting switch. Sensitive pressure-actuated diaphragm expands or contracts with pressure variations, moving a lever mechanism which operates the snap switch. A screw on top of the case allows set point adjustment without removing the cover. Differential is adjusted by means of a dial located inside the case.   Product Data Sheet   Specifications Application: Safety control for steam heating boilers Dimensions: 4 15/32 in. high x 3 3/8 in. wide x 2 1/4 in. deep Maximum Safe Operatin