The P72 controls for high pressure applications are designed primarily for high pressure cut-out control, head-pressure control, and condenser fan cycling control on commercial refrigeration and air conditioning applications.
Johnson Controls, Inc. Dual Pressure Control P72AA-17C. Technical details and specs found HERE
• Johnson Controls, Inc.
• P72AA-17C
• P72AA17C
• Dual Pressure Control
• DPST switch only, 3/4 in.
• Conduit opening
• DPST switch, open-low, automatic reset
• NEMA 1 enclosure, no adjustment knob