Johnson Controls P70DA-63 Pressure Control

The Johnson Controls P70DA-63 is a purpose-built ammonia pressure control designed for heavy-duty industrial refrigeration. This single pole pressure control features an Open-High switch action, effectively serving as a high-limit safety cutout for systems utilizing ammonia refrigerant. With a versatile 20 to 100 psi adjustable range, it provides reliable protection against overpressure conditions that could compromise system integrity. Unlike automatic units, this model incorporates a manual reset lockout mechanism, requiring a technician to physically inspect the equipment and clear the fault before the system can restart, ensuring maximum safety for unmonitored plant operations.

Built with a rugged SPST (Single-Pole Single-Throw) switch configuration, the P70DA-63—which is technically identical to the P70DA-63C—is engineered to handle the corrosive nature of ammonia through specialized internal components. It is an essential component for industrial refrigeration high pressure cutout applications where ammonia safety controls are non-negotiable. The "Sight-Set" calibrated scale allows for quick visual verification of setpoints, streamlining maintenance and diagnostic procedures for service contractors.

Key Benefits

• Ammonia Compatible Construction: Specifically designed for industrial refrigeration environments where standard bronze bellows would fail.
• Manual Reset Lockout: Enhances safety by preventing automatic cycling after a high-pressure event, ensuring a PENN pressure control manual override.
• Wide Pressure Range: Adjustable from 20" to 100 psi to match various ammonia system head pressure requirements.
• SPST Switch Action: Clean high pressure cutout logic that opens the circuit on pressure rise to protect the compressor.
• Drop-In Replacement: Fully interchangeable with model P70DA-63C for seamless field service upgrades.

Common Questions

While compatible with most non-corrosive fluids, this unit is specifically optimized for ammonia use. For standard HFC/HCFC applications, a standard P70 series with bronze bellows is typically used, though the stainless steel construction here provides superior durability.

These models are functionally identical and share the same technical specifications, including the SPST switch type and manual reset functionality.

On manual reset models like the Johnson Controls P70DA-63, the differential is typically fixed, as the unit is designed to lock out until the pressure drops significantly and the reset button is manually depressed.

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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.