PA404B1023/U Pressuretrol Controller with Additive 1 to 5 psi Differential Pressure

Part Number: PA404B1023/U Brand: Resideo Technologies Inc

Pressuretrol Controller with Additive 1 to 5 psi Differential Pressure

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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



  • 4-15/32 in. high x 3-3/8 in. wide x 2-1/4 in. deep
  • 114 mm high x 86 mm wide x 58 mm deep

Maximum Safe Operating Pressure

  • 20 psi
  • 137 kPa


  • Case: Gray enamel finish


  • Recommended minimum set point is differential setting plus 1 1/2 psi.

Electrical Ratings

  • 0.25 A @ 0.25 to 12 Vdc; 120 Vac, Resistive: 8.3A; 240 Vac, Resistive: 8.3A; 277 Vac, Resistive 7.2A

Approvals, Underwriters Laboratories Inc.

  • UL Listed: File no. MP466, Guide no. MBPR.

Approvals, Canadian Standards Association

  • CSA Listed: File no. LR1620.

Tradeline Value

  • Tradeline

Operating Humidity Range

  • 95% RH, non-condensing

Temperature Ratings

  • 66 °C - Maximum Ambient
  • 150 °F - Maximum Ambient

Sensor Element

  • Stainless Steel diaphragm

Operating Range

  • 0.5 psi to 9.0 psi Adjustable
  • 3 kPa to 62 kPa Adjustable

Differential Pressure Range

  • 1 to 5 psi Adj.
  • 7 to 35 kPa Adj.

Differential Type

  • Additive or Subtractive

Switching Action

  • Makes at set point plus differential on pressure rise; Breaks at set point on pressure fall

Pressure Surge

  • 50 psi
  • 345 kPa

Adjustable Scale Range

  • 0.5 psi to 9 psi
  • 3 kPa to 62 kPa

Pilot Duty Ratings

  • 150 VA @ 277 Vac

Switch Type

  • SPST snap-acting switch

Pipe Connection

  • 1/4 in. female pipe threads

  • Used with Suspension Type Unit Heaters

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