Honeywell Pressure Controller 1 psi - 5 psi Adj.
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..
ApplicationSafety control for steam heating boilersDimensions (in.)4 15/32 in. high x 3 3/8 in. wide x 2 1/4 in. deepDimensions (mm)114 mm high x 86 mm wide x 58 mm deepMaximum Safe Operating Pressure (psi)20 psiMaximum Safe Operating Pressure (kPa)137 kPaMaterialsCase: Gray enamel finishCommentsRecommended minimum set point is differential setting plus 1 1/2 psi.Electrical Ratings0.25 A @ 0.25 to 12 Vdc; 120 Vac, Resistive: 8.3A; 240 Vac, Resistive: 8.3A; 277 Vac, Resistive 7.2AApprovals, Underwriters Laboratories Inc.UL Listed: File no. MP466, Guide no. MBPR.Approvals, CSACSA Listed: File no. LR-95329-6.Operating Humidity Range (% RH)95% RH, non-condensingTemperature Ratings (C)66 C - Maximum AmbientTemperature Ratings (F)150 F - Maximum AmbientSensor ElementStainless Steel diaphragmOperating Range (psi)0.5 psi to 9.0 psi AdjustableOperating Range (kPa)3 kPa to 62 kPa AdjustableDifferential Pressure Range (psi)1 to 5 psi Adj.Differential Pressure Range (kPa)7 to 35 kPa Adj.Differential TypeAdditive or SubtractiveSwitching ActionMakes at set point on pressure fall; Breaks at set point plus differential on pressure risePressure Surge (max. psi)50 psiPressure Surge (max. kPa)345 kPaAdjustable Scale Range (psi)0.5 psi to 9 psiAdjustable Scale Range (kPa)3 kPa to 62 kPaPilot Duty Ratings150 VA @ 277 VacSwitch TypeSPST snap-acting switchPipe Connection1/4 in. female pipe threads