Johnson Controls P170DA-400 Pressure Control

The Johnson Controls P170DA-400 Pressure Control is a heavy-duty high pressure cutout switch engineered for critical over-pressure protection in commercial refrigeration and HVAC systems. As a manual reset pressure control, it provides a hard lockout when system pressures exceed the technician-defined setpoint, preventing compressor damage and ensuring a thorough inspection before the system returns to service. This SPST high pressure control features an open-high configuration with a wide operating range of 200 to 610 PSIG, making it a drop-in HVAC pressure switch replacement for units running high-pressure, non-corrosive refrigerants like R410A. The rugged construction includes a 1/4" male flare connector for secure, leak-proof integration into the high-side liquid or discharge line. This unit is technically identical to the P170DA-400C, offering high-reliability HVAC safety controls for facility maintenance and mechanical contractors.

Key Contractor Benefits:

• Universal Refrigerant Compatibility: Specifically rated for non-corrosive high-pressure refrigerants, ensuring reliable performance in modern R410A systems.
• Manual Lockout Safety: The manual reset mechanism forces a physical diagnostic check of the system after a high-pressure event, preventing rapid cycling and premature equipment failure.
• Precise Pressure Calibration: High-range capability from 200 to 610 PSIG allows for fine-tuned protection in demanding commercial cooling applications.
• Durable OEM Construction: Built by Johnson Controls Penn, these controls utilize a robust bellows design for long-term repeatability and sensor accuracy.
• Standardized Installation: Features a 1/4 inch male flare fitting for compatibility with standard refrigeration pressure control cap tubes and hoses.

Common Technical Questions:

How do I wire the P170DA-400 for safety lockout?
As an SPST open-high control, the terminals should be wired in series with the compressor contactor coil or the control circuit. When pressure exceeds the setpoint, the contacts open, breaking the circuit until the manual reset button is depressed.

Can this be used on low-pressure R22 systems?
While functionally possible, this Johnson Controls pressure switch is optimized for high-pressure refrigerants. Ensure your high-side cut-out requirements fall within the 200-610 PSIG range for proper calibration.

What is the difference between the P170DA-400 and P170DA-400C?
These models are technically identical in specifications, ratings, and physical dimensions; the 'C' suffix often denotes bulk packaging or specific distribution channels but does not affect performance or compatibility.

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.