Pressuretrol Controller with Additive: 1 psi to 5 psi Differential pressure and Breaks at setpoint o
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The PA404 is a series 40 (2-wire, SPST) pressuretrol controller for use in 24, 120, 240 or 277 volt control circuits or in self powered (millivoltage) applications.
• 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.
Application Safety control for steam heating boilers
Pressure Ratings (Set Point) Recommended minimum set point is differential setting plus 1 1/2 psi.
Pressure Sensing Element Stainless Steel diaphragm
Switching Action Breaks at setpoint on pressure fall; Spst makes at set point plus differential on pressure rise.
Switch Type SPST snap-acting switch
Pipe Connections 1/4 in. female pipe threads
Pressure Surge (max. psi) 50 psi
Pressure Surge (max. kPa) 345 kPa
Adjustable Scale Range (psi) 0.5 psi to 9 psi
Adjustable Scale Range (kPa) 3 kPA to 62 kPa
Adjustable Operating Pressure Range (psi) 0.5 psi to 9.0 psi
Adjustable Operating Pressure Range (kPa) 3 kPa to 62 kPa
Maximum Safe Operating Pressure (psi) 20 psi
Maximum Safe Operating Pressure (kPa) 137 kPa
Differential Pressure Range (psi) Additive: 1 to 5 psi
Differential Pressure Range (kPa) Additive: 7 to 35 kPa
Electrical Ratings 0.25 A @ 0.25 to 12 Vdc
Electrical Ratings (120 Vac, Full Load) 8.0 A
Electrical Ratings (120 Vac, Locked Rotor) 48.0 A
Electrical Ratings (120 Vac, Resistive) 8.3 A
Electrical Ratings (240 Vac, Full Load) 5.1 A
Electrical Ratings (240 Vac, Locked Rotor) 30.6 A
Electrical Ratings (240 Vac, Resistive) 8.3 A
Electrical Ratings (277 Vac, Resistive) 7.2 A
Electrical Ratings (Pilot Duty) 150 VA @ 277 Vac
Materials (Case) Gray enamel finish
Maximum Ambient Temperature (F) 150 F
Maximum Ambient Temperature (C) 66 C
Operating Humidity Range (% RH) 95% RH, non-condensing
Dimensions (in.) 4 15/32 in. high x 3 3/8 in. wide x 2 1/4 in. deep
Dimensions (mm) 114 mm high x 86 mm wide x 58 mm deep
Approvals, Underwriters Laboratories Inc UL Listed: File no. MP466, Guide no. MBPR.
Approvals, Canadian Standards Association CSA Listed: File no. LR1620.
Tradeline Value Tradeline
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