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- The PA404 is a series 40 (2-wire, SPST) pressure controller for use in 24, 120, 240 or 277 volt control circuits or in self powered (millivoltage) applications.
Pressuretrol® Pressure Controller, 3 to 15 psi Control Range, SPST Switch, Snap Acting Electronic, 1 to 5 psi Differential Pressure Range, Enamel, Gray, 4-15/32 in H x 3-3/8 in W x 2-1/4 in D
- 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 microns 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 adjustments without removing the cover
- Differential is adjusted by means of a dial located inside the case
- Control Range3 to 15 psiSwitch ActionSnap Acting ElectronicSwitch TypeSPSTColorGrayDifferential Pressure Range1 to 5 psiDimensions4-15/32 in H x 3-3/8 in W x 2-1/4 in DFinishEnamelManufacturerHoneywellManufacturer #PA404A1025/U