• 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.Pressuretrol Controller, Used with suspension type unit heaters.Application | Used with suspension type unit heaters |
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Pressure Ratings (Set Point) | Recommended minimum set point is differential setting plus 1 1/2 psi. |
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Pressure Sensing Element | Stainless Steel diaphragm |
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Overview | 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. |
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Switch Type | SPST snap-acting switch |
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Pipe Connections | 1/4 in. female pipe threads |
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Pressure Surge (max. psi) | 50 psi |
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Pressure Surge (max. kPa) | 345 kPa |
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Adjustable Scale Range (psi) | 0.5 psi to 9 psi |
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Adjustable Scale Range (kPa) | 3 kPA to 62 kPa |
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Adjustable Operating Pressure Range (psi) | 0.5 psi to 9.0 psi |
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Temperature Ratings (F) | 150 F - Maximum Ambient |
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Temperature Ratings (C) | 66 C - Maximum Ambient |
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Switching Action | Breaks at set point on pressure fall |
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Adjustable Operating Pressure Range (kPa) | 3 kPa to 62 kPa |
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Maximum Safe Operating Pressure (psi) | 20 psi |
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Maximum Safe Operating Pressure (kPa) | 137 kPa |
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Differential Pressure Range (psi) | Additive or Subtractive: 1 to 5 psi Adj. |
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Differential Pressure Range (kPa) | Additive or Subtractive: 7 to 35 kPa Adj. |
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Electrical Ratings | 0.25 A @ 0.25 to 12 Vdc |
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Electrical Ratings (120 Vac, Full Load) | 8.0A |
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Electrical Ratings (120 Vac, Locked Rotor) | 48.0A |
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Electrical Ratings (120 Vac, Resistive) | 8.3A |
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Electrical Ratings (240 Vac, Full Load) | 5.1A |
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Electrical Ratings (240 Vac, Locked Rotor) | 30.6A |
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Pilot Duty Ratings | 150 VA @ 277 Vac |
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Electrical Ratings (240 Vac, Resistive) | 8.3A |
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Electrical Ratings (277 Vac, Resistive) | 7.2A |
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Electrical Ratings (Pilot Duty) | 150 VA @ 277 Vac |
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Materials (Case) | Gray enamel finish |
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Maximum Ambient Temperature (F) | 150 F |
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Operating Humidity Range (% RH) | 95% RH, non-condensing |
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Maximum Ambient Temperature (C) | 66 C |
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Dimensions (in.) | 4 15/32 in. high x 3 3/8 in. wide x 2 1/4 in. deep |
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Dimensions (mm) | 114 mm high x 86 mm wide x 58 mm deep |
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Approvals, Underwriters Laboratories Inc | UL Listed: File no. MP466, Guide no. MBPR. |
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Approvals, Canadian Standards Association | CSA Listed: File no. LR1620. |
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Comments | Recommended minimum set point is differential setting plus 1 1/2 psi. |
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