Johnson Controls P70AA-119 Pressure Control

The Johnson Controls P70AA-119 is a heavy-duty ammonia pressure control designed specifically for industrial refrigeration systems where ammonia compatibility is mandatory. This single pole high pressure control features a close high open low switch action, making it an ideal choice for condenser fan cycling and high-side pressure management. Built with a stainless steel 1/4" female NPT connector, it ensures long-term reliability in corrosive environments that would standard brass bellows. For service technicians, the P70AA-119 is functionally identical to the P70AA-119C model, offering a broad operating range of 50 to 300 psi and an adjustable 20 to 100 psi differential.

This SPST pressure switch is housed in a rugged all-steel enclosure for maximum protection in mechanical rooms. The Sight-Set calibrated scale allows for precise adjustments without pulling the cover, streamlining the high pressure cut-out setup on the job site. With a 400 psig maximum overpressure rating, it provides a significant safety margin for commercial and industrial HVACR applications. When replacing older Penn P70 series units, this ammonia-safe model ensures the electrical components remain isolated from the refrigerant stream via high-integrity bellows construction.

• Ammonia Compatible: Equipped with a stainless steel 1/4" NPT connection specifically for R-717 applications.
• High-Side Protection: Reliable close high open low action for active fan cycling control and pressure limiting.
• Adjustable Range: Flexible 50 to 300 psi setpoint range with a tunable 20 to 100 psi differential.
• Industrial Durability: Features an all-steel case and SPST load-carrying contacts for direct control of AC motors.
• Sight-Set Technology: Visible calibration scale for rapid setpoint verification during routine maintenance.

Common Questions

Is the P70AA-119 compatible with standard refrigerants?
While designed for ammonia, the stainless steel construction and 1/4" female NPT connection allow for use with non-corrosive refrigerants (R-22, R-404A, R-507), though standard P70 models are typically preferred for cost-efficiency in those applications.

What is the difference between P70AA-119 and P70AA-119C?
Technically, they are identical. The "C" suffix often denotes bulk packaging or minor administrative variations in the Johnson Controls catalog, but the pressure specifications and ammonia compatibility are the same.

Can this be used as a manual reset high limit?
No, this is an automatic reset control. If your system requires a manual lockout for safety compliance, you should specify a P70DA or P170DA series model.

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.