PA404A1009/U Pressure Controller 1 psi - 5 psi Adj. Honeywell


SKU: PA404A1009U



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..


Product Specifications

Application:  Safety control for steam heating boilers
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

Maximum Safe Operating Pressure (psi):  20 psi

Maximum Safe Operating Pressure (kPa):  137 kPa

Materials:  Case: Gray enamel finish

Comments:  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. LR-95329-6.

Operating Humidity Range (% RH):  95% RH, non-condensing

Temperature Ratings (C):  66 C - Maximum Ambient

Temperature Ratings (F):  150 F - Maximum Ambient

Sensor Element:  Stainless Steel diaphragm

Operating Range (psi):  0.5 psi to 9.0 psi Adjustable

Operating Range (kPa):  3 kPa to 62 kPa Adjustable

Differential Pressure Range (psi):  1 to 5 psi Adj.

Differential Pressure Range (kPa):  7 to 35 kPa Adj.

Differential Type:  Additive or Subtractive

Switching Action:  Makes at set point on pressure fall; Breaks at set point plus differential on pressure rise

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

Pilot Duty Ratings:  150 VA @ 277 Vac

Switch Type:  SPST snap-acting switch

Pipe Connection:  1/4 in. female pipe threads
More Information
Manufacturer Honeywell
Manufactuer # PA404A1009U


Manufacturer Honeywell
Manufactuer # PA404A1009U

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