• 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.PA404A1025 Pressuretrol Controller, Safety control for steam heating boilers.| Application | Safety control for steam heating boilers |
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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) | 3 psi to 15 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 | Makes at set point minus differential on pressure fall |
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| Adjustable Operating Pressure Range (kPa) | 21 kPa to 103 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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