Johnson Controls P170MA-18 Pressure Control

The Johnson Controls P170MA-18 Pressure Control is a heavy-duty dual-pressure regulator engineered for high-pressure refrigerants like R-410A. This dual pressure control utilizes a SPST switch action to provide comprehensive system protection by managing both suction and discharge pressures. The low-pressure side operates within a range of 12" Hg to 80 psi with a 5 to 35 psi adjustable differential, while the high-pressure side monitors from 100 to 500 psi. Featuring a manual reset lockout on the high-pressure side, the P170MA-18 ensures the system remains offline following a critical pressure surge until a technician can verify system integrity. Connectivity is handled via a 1/4" external flare connector, ensuring a standard fit for most commercial HVACR racks and condensing units. Known for its Penn dual pressure switch reliability, this control is built to withstand the vibration and environmental demands of industrial refrigeration applications without compromising calibration accuracy.

• Enhanced System Safety: The manual reset high-limit lockout prevents repeated compressor cycling under dangerous head pressures.
• Broad Compatibility: Designed for use with non-corrosive refrigerants, including high-pressure R-410A systems.
• Contractor-Grade Durability: Housed in a NEMA 1 enclosure, ensuring the internal mechanisms are protected from workplace debris.
• Precise Pressure Management: Independent adjustment scales allow for fine-tuning the low-pressure cutout and high-pressure safety limits.

Common Questions

Does the P170MA-18 reset automatically after a high-pressure trip?
No, this specific model features a manual reset on the high-pressure side. If the discharge pressure exceeds the 500 psi limit, a technician must physically reset the device to resume operation, ensuring the cause of the high pressure is addressed.

Is this control compatible with ammonia systems?
No, the P170MA-18 is designed for non-corrosive refrigerants. For ammonia applications, a stainless steel bellows or ammonia-rated pressure control is required.

What is the maximum overpressure rating for this device?
The high-pressure side is designed to withstand bursts and surges significantly above its 500 psi setpoint, though we recommend staying within the operational range to maintain setpoint accuracy.

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.