Johnson Controls P77AAA-15500C Single Pressure Control 44-435 psi SPDT Auto Reset

The Johnson Controls (PENN) P77AAA-15500C is a single pressure control, also called a refrigeration pressure switch or high pressure cut-out control. It is built for commercial refrigeration and air-conditioning systems. It has an adjustable range of 44 to 435 psi and automatic reset. The switch senses system pressure and operates a snap-action electrical switch.

Key Features:

• Pressure range: 44 to 435 psi (3 to 30 bar)
• Differential: 44 to 174 psi (3 to 12 bar)
• Maximum bellows pressure: 479 psi (33 bar)
• Switch action: SPDT (single-pole, double-throw), so it can also be wired to alarms or auxiliary circuits
• Reset type: Automatic reset (P77AAA type)
• Connection: 914 mm (36 in.) capillary with a 7/16-20 UNF, 6 mm (1/4 in.) flare fitting
• Sight-set calibrated adjustment: a visible pressure scale that you can adjust without removing the cover
• Splash-proof enclosure with generous wiring space for easier wiring and maintenance

The P77 series is used for high-pressure cut-out, pump-down control, condenser fan cycling and capacity control. It works with common refrigerants and with other non-corrosive fluids. Use it as an operating control only.