Pressure Control Pressuretrol Snap Acting 24/120/240 Volt

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.

• With additive 1 to 5 psi differential pressure
• 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
• 20 psi maximum safe pressure
• Electrical Rating: 0.25 A at 0.25 to 12 VDC, 120 VAC, Resistive: 8.3 A, 240 VAC, Resistive: 8.3 A, 277 VAC, Resistive: 7.2 A
• 95% RH, non-condensing humidity
• 150 deg F ambient temperature
• Additive or subtractive differential
• Switching Action: Makes at set point plus differential on pressure rise, breaks at set point on pressure fall
• 50 psi surge
• Pilot Duty Rating: 150 VA at 277 VAC