resideo PA404A1033/U

Description

The PA404 is a Series 40 (Two-wire, SPST) pressuretrol controller for use in 24, 120, 240, or 277 V control circuits or in self-powered (millivoltage) applications.

resideo Pressuretrol Controller, 40 Series, Model: PA404, 0.25 A at 0.25 to 12 VDC, 8.3 A at 120/240 VAC, 7.2 A at 277 VAC Resistive, 120/240/277 VAC, 0.25 to 12 VDC, 150 VA, 0.5 to 9 psi Sensing, FPT Connection, 95% Relative Non-Condensing Humidity, 1/4 in, 0.5 to 9 psi Pressure, Enamel, Gray, 150 deg F, 4.47 in H x 3.38 in W x 2.25 in D, 1 to 5 psi Differential Pressure, 50 psi Pressure Surge, Additive Differential Type, Pressure Actuated SPST, Snap-Action Switch, Stainless Steel Diaphragm Element

Features

• 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

Specifications

Documentation