Pressure Controller; Type Additive Differential; Operator Type Stainless Steel Diaphragm; Operating Pressure Rating 0.5 to 9 PSI; Differential Pressure Rating 1 to 5 PSI; Pressure Media Steam; Contact Configuration SPST 2-Circuit; Contact Rating 8/5.1 Amp at 120/240 Volt (Full Load), 30.6/48 Amp (Locked Rotor), 7.2/8.3 Amp at 120/240/277 Volt AC (Resistive); Connection Type 1/4 Inch Female Threaded; Application Steam Heating Boiler; Approval UL, CSA; Overall Dimension 3-3/8 Inch Width x 2-1/4 Inch Depth x 4-15/32 Inch Height; Case Finish Gray Enamel; Humidity 95 Percent Relative(Non-Condensing); Temperature Rating 150 Deg F
Overall Dimension 3-3/8 Inch Width x 2-1/4 Inch Depth x 4-15/32 Inch Height; Case Finish Gray Enamel; Humidity 95 Percent Relative(Non-Condensing); Temperature Rating 150 Deg F
Features/Benefits
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 The pa404b is used with suspension type unit heaters to make the fan circuit when a pressure rise indicates the presence of steam 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
