Resideo PA404A1025 Pressuretrol Controller

The Resideo PA404A1025 Pressuretrol Controller is a heavy-duty, pressure-actuated high limit safety control engineered specifically for steam heating boilers. This SPST switching device serves as a critical fail-safe, designed to break the electrical circuit and shut down the burner if system pressure exceeds your defined set point. With an adjustable pressure range of 3 to 15 psi and a subtractive differential of 1 to 5 psi, this controller allows for precise field calibration to match specific boiler requirements. The PA404A1025 features a robust stainless steel diaphragm and 1/4 inch female threads for reliable installation on a standard steam pigtail siphon. Whether you are performing a steam boiler pressure control replacement or a new install, this Honeywell Pressuretrol—identical to the PA404A1025/U—is compatible with 24V, 120V, 240V, and 277V circuits, as well as millivolt applications, providing versatile HVAC safety switch performance for commercial and residential steam systems.

Key Benefits

• Broad Voltage Compatibility: Integrated snap-acting MICRO SWITCH supports line voltage, low voltage, and millivolt control circuits.
• Precision Engineering: Features a stainless steel diaphragm sensing element for consistent response and long-term durability in high-heat environments.
• Streamlined Calibration: External set point screw allows for pressure adjustments without removing the enamel-finished steel cover.
• Reliable Safety Cutout: Rated for a maximum safe operating pressure of 20 psi to prevent hazardous overpressure conditions.
• Flexible Differential: Internal dial offers an adjustable differential range for fine-tuning the burner cycle.

Common Questions

How do I adjust the pressure set point on the PA404A1025?
The main scale cutout point is adjusted via the screw located on top of the case. For the most accurate system response, veteran installers recommend a minimum set point equal to the differential setting plus 1.5 psi.

What is the difference between the PA404A1025 and PA404A1025/U?
These parts are technically identical. The "/U" suffix simply denotes universal packaging for retail or wholesale distribution; the technical specifications and performance remain exactly the same.

Does this controller require a steam siphon for installation?
Yes, always mount the Pressuretrol controller on a steam trap siphon (pigtail). This ensures that live steam does not directly contact the stainless steel diaphragm, preventing damage from high temperatures and corrosive boiler scale.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.