Honeywell Pressuretrol Pressure Controller, 0.5 to 9 psi Control Range, SPST Switch, Snap-Acting, 1 to 5 psi Differential, Enamel, Gray, 4-15/32 inch height x 3-3/8 inch Width x 2-1/4 inch D
The PA404 is a series 40 (2-wire, SPST) pressure controller for use inch 24, 120, 240 or 277 volt control circuits or inch self powered (millivoltage) applications.
Dimensions: 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
