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- 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.
Pressure Controller, Series: PA404, 150 deg F Control Range, SPST Switch, Snap Action, 1 to 5 psi Adjustable Differential Pressure Range, FNPT, Gray Enamel, 3-3/8 in W x 2-1/4 in D x 4-15/32 in H
- 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
- Without lugs
- Control Range150 deg FSwitch ActionSnap ActionSwitch TypeSPSTConnection TypeFNPTDifferential Pressure Range1 to 5 psi AdjustableDimensions3-3/8 in W x 2-1/4 in D x 4-15/32 in HFinishGray EnamelManufacturerResideo TechnologiesManufacturer #PA404A1009/USeriesPA404