Johnson Controls P170MA-1 Pressure Control

The Johnson Controls P170MA-1 is a commercial-grade dual pressure control designed for precise high and low-side management in refrigeration and air conditioning systems. This P170 series pressure switch features an SPST switch action with a manual reset lockout on both the high and low pressure sides, ensuring critical system protection against extreme operating conditions. The low-pressure side operates within a range of 12" Hg to 80 psi with a field-adjustable differential of 5 to 35 psi, while the high-pressure side monitors a range of 100 to 500 psi. For HVACR contractor installations requiring reliable head pressure control and suction side monitoring, the P170MA-1 utilizes 36-inch capillary tubes with 1/4" male flare nuts for standard service valve integration. Engineers and technicians often specify this Penn dual pressure control for its rugged construction and compatibility with non-corrosive refrigerants, providing a dependable high-limit cutout solution for industrial compressors.

• Manual Reset Lockout: Provides essential safety by requiring professional intervention after a high or low-pressure trip event.
• Universal Compatibility: Designed for use with R-22, R-134A, R-404A, and R-507 refrigerants in commercial applications.
• Precise Pressure Adjustment: Independent scales for high and low settings allow for exact calibration to system specifications.
• Durable Capillary Leads: Features 36-inch capillaries to minimize vibration transfer to the switch mechanism.
• NEMA 1 Enclosure: Heavy-duty housing protects internal components from dust and debris in mechanical rooms.

What is the difference between the P170MA-1 and P170LB models?
The P170MA-1 features a manual reset on both the high and low-pressure sides, whereas many LB models utilize an automatic reset on the low side and manual on the high side. The MA series ensures the system stays offline until a technician evaluates the cause of the pressure deviation.

Can this control be used with R-410A systems?
While the P170MA-1 is rated up to 500 psi, many R-410A high-side requirements exceed this range. Always verify your specific system's peak operating pressures against the 100 to 500 psi range of this control before installation.

How do I calibrate the differential on the low side?
The low-pressure differential is adjustable between 5 and 35 psi. Use a calibrated gauge set to verify your cut-in and cut-out points during the commissioning process to ensure the SPST switch cycles the compressor correctly.

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.