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. LR1620.
- 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)
- 3 psi to 15 psi Adjustable
- Operating Range (kPa)
- 21 kPa to 103 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 minus differential on pressure fall; Breaks at set point 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
There is no literature attached to this product, please try another material search. If you believe that there should be literature for this product, please contact Customer Care for website support.
