Honeywell PA404 Pressuretrol Controller
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.
Select a link under the "item" tab below to order.
| Cat # | Switching Action | Switch Type | Application: | Maximum Operating Pressure | Adjustable Operating Pressure Range |
| PA404A1025 | — | SPST snapacting switch | Safety control for steam heating boilers | 20 psi | 3 psi to 15 psi |
| * PA404A1033 | Breaks at setpoint on pressure fall; SPST makes at set point plus differential on pressure rise. | SPST snapacting switch | Safety control for steam heating boilers | 20 psi | 0.5 psi to 9.0 psi |
| * PA404B1023 | Breaks at setpoint on pressure fall; SPST makes at set point plus differential on pressure rise. | SPST snapacting switch | Used with suspension type unit heaters | 20 psi | 0.5 psi to 9.0 psi |
| Dimensions, Approximate: | 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) | ||
| Electrical Ratings: | 0.25 A @ 0.25 to 12 Vdc | ||
| Electrical Ratings (120 Vac, Full Load): | 8.0 A | ||
| Electrical Ratings (120 Vac, Locked Rotor): | 48.0 A | ||
| Electrical Ratings (120 Vac, Resistive): | 8.3 A | ||
| Electrical Ratings (240 Vac, Full Load): | 5.1 A | ||
| Electrical Ratings (240 Vac, Locked Rotor): | 30.6 A | ||
| Electrical Ratings (240 Vac, Resistive): | 8.3 A | ||
| Electrical Ratings (277 Vac, Resistive): | 7.2 A | ||
| Electrical Ratings (sealed): | 150 VA @ 277 Vac | ||
| Differential Pressure Range: | Subtractive: 1 to 5 psi (7 to 35 kPa); Additive: 1 to 5 psi (7 to 35 kPa) |
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| Pressure Ratings (Set Point): | Recommended minimum set point is differential setting plus 1-1/2 psi. | ||
| Pressure Surge (max.): | 50 psi (345 kPa) | ||
| Pressure Sensing Element: | Stainless Steel diaphragm | ||
| Adjustable Scale Range: | 0.5 psi to 9 psi (3 kPA to 62 kPa) | ||
| Materials (Case): | Gray enamel finish | ||
| Pipe Connections: | 1/4 in. female pipe threads | ||
| Operating Humidity Range (% RH): | 95% RH, non-condensing | ||
| Maximum Ambient Temperature: | 150 F (66 C) | ||
| Approvals: | |||
| Canadian Standards Association: | CSA Listed: File no. LR1620. | ||
| Underwriters Laboratories Inc. | UL Listed: File no. MP466, Guide no. MBPR. |
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