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.
Features
- 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.
- Item Type
- Product
- 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
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