Johnson Controls P70DA-1 Pressure Control

When you are managing commercial refrigeration or high-side HVACR systems, the Johnson Controls P70DA-1 Pressure Control is a critical safeguard for compressor protection. This high pressure cutout switch is engineered to open the circuit on a pressure rise, featuring a manual reset lockout mechanism that ensures a technician inspects the system before operation resumes. With a versatile pressure range of 50 to 450 psi and a robust SPST (Single Pole Single Throw) switch action, it is a standard choice for contractors looking for reliability in the field. The unit comes equipped with a 36-inch capillary and a 1/4-inch flare nut, providing flexible mounting options away from high-vibration discharge lines. Designed for compatibility with non-corrosive refrigerants like R-22, R-404A, and R-134a, this pressure limiting control provides limit protection for expensive system components, maintaining a 525 psig maximum working pressure to handle demanding environments.

Key Benefits

• Manual Reset Security: The trip-free lockout prevents automatic restarts, forcing a manual check of the system following a high-pressure event.
• Rugged Construction: Features an all-steel case and cover to protect internal bellows and switch components from mechanical damage.
• Precise Adjustment: Equipped with a visible "Sight-Set" calibrated scale for easy setpoint verification without removing the cover.
• Flexible Installation: The 36-inch capillary allows for remote mounting to minimize the impact of compressor pulsation.
• Universal Compatibility: Rated for use with most common non-corrosive refrigerants and suitable for air, water, or oil pressure applications.

Common Questions

How do I adjust the cutout setpoint on a manual reset model?
On models like the P70DA-1, turn the range screw located at the top of the unit while observing the scaleplate. Since it is a manual reset lockout model, there is no differential adjustment; the differential is fixed.

Can this control be used with R-410A systems?
While compatible with many refrigerants, always verify that your system?s maximum operating pressures do not exceed the 450 psi range and 525 psig overpressure limit of this specific mechanical pressure switch.

What is the best way to prevent bellows failure?
Mount the control upright and level. Always locate your pressure tap points on the top side of the refrigerant lines to prevent oil and sediment from accumulating in the bellows.

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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.