Pressuretrol Controller with Subtractive: 1 psi to 5 psi Differential pressure (Honeywell)
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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
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) 3 psi to 15 psi
Adjustable Operating Pressure Range (kPa) 21 kPa to 103 kPa
Maximum Safe Operating Pressure (psi) 20 psi
Maximum Safe Operating Pressure (kPa) 137 kPa
Differential Pressure Range (psi) Subtractive: 1 to 5 psi
Differential Pressure Range (kPa) Subtractive: 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.
Replaces Part Numbers: