Description
The Johnson Controls P170MA-1 is a heavy-duty dual pressure control engineered for reliable refrigeration and HVAC system protection. Combining both low- and high-pressure sensing in a single compact unit, this control monitors system pressures simultaneously and interrupts operation when unsafe conditions are detected — helping protect compressors and refrigeration equipment from damage.
Switch Action & Safety
The P170MA-1 features a Single-Pole Single-Throw (SPST) switch action with a manual reset lockout, meaning the control will not automatically restart after a pressure fault. A technician must manually reset the device before the system can resume operation, providing an added layer of safety and preventing repeated short-cycling under fault conditions.
Pressure Ranges
- Low Pressure Side: 12″ Hg (vacuum) to 80 PSI operating range
- Low Pressure Differential: 5 to 35 PSI adjustable
- High Pressure Side: 100 to 500 PSI operating range
Connection & Capillary
- 36″ capillary tube for flexible installation positioning
- 1/4″ Male Flare Nut connection for easy, leak-free hookup to system service ports
Key Features
- Dual pressure control — monitors both low and high side simultaneously
- SPST switch action for straightforward circuit interruption
- Manual reset lockout requires technician intervention after trip event
- Wide low-side range from deep vacuum (12″ Hg) to 80 PSI
- High-side range up to 500 PSI for high-pressure refrigerant systems
- Adjustable low-side differential: 5–35 PSI
- 36″ capillary with 1/4″ Male Flare Nut connection
- Johnson Controls quality construction for long service life
Typical Applications
The P170MA-1 is well-suited for use in commercial refrigeration systems, air conditioning equipment, and other HVAC applications where dual-pressure protection is required. The manual reset lockout makes it ideal for installations where unattended automatic restart after a fault is undesirable.
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