The Johnson Controls P72MA-1 is a heavy-duty Two Pole Dual Pressure Control engineered for reliable refrigeration and HVAC system protection. Featuring a Double Pole Single Throw (DPST) switching configuration, this control simultaneously monitors both low-side and high-side system pressures, providing comprehensive circuit protection in a single device.
Low-Side Pressure Control
- Low Pressure Range: 20″ WC to 100 PSI
- Low Pressure Differential: 6 PSI to 50 PSI
- Automatic reset on low-pressure trip
High-Side Pressure Control
- High Pressure Range: 100 PSI to 425 PSI
- Lockout (Manual Reset Required) on high-pressure trip
- Provides positive system shutdown protection against dangerously high discharge pressures
Design & Construction
- Switching Type: DPST (Double Pole Single Throw) — two-pole design opens both legs of the circuit simultaneously
- 36″ capillary tube for flexible installation and remote sensing
- 1/4″ flare connection for easy field installation
- Manual reset lockout on high-pressure side ensures technician intervention before restart
Key Benefits
- Dual-function control monitors both high and low refrigerant pressures in one unit
- Wide low-pressure range accommodates diverse refrigerant and system types
- High-pressure lockout protects compressors and system components from catastrophic overpressure events
- DPST switching provides positive, two-pole circuit interruption for enhanced safety
- 36″ capillary allows mounting flexibility away from the sensing point
- Trusted Johnson Controls quality for commercial and industrial refrigeration applications
Applications
- Commercial refrigeration systems
- Air conditioning and heat pump systems
- Compressor protection circuits
- Industrial process cooling equipment
