The P70, P72, and P170 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. Controls are available in several pressure ranges and are compatible with most common refrigerants. They may also be used on other non-corrosive fluid applications. Ammonia compatible models are also available. Several different electrical ratings and switch configurations are available. The P72 models provide direct control of 208-240 volt single-phase motors up to 3 hp, and 208-220 volt 3-phase motors up to 5 hp.   Features All-steel case and cover provides long lasting, rugged protection for internal components. “Sight-Set” calibrated pressure adjustment displays a visible pressure scale, fully adjustable through the range without removing the cover (on NEMA 1 enclosure models). Manual reset lockout option provides “trip free” lockout that cannot be overridden or reset until pressure returns to specified level. Variety of available pressure connection styles allows greater flexibility when mounting control and adapting pressure connections to field application requirements.   Applications P70C, P70D P170C and P170D models with Single-Pole Single-Throw (SPST) Open-high switch action are the most popular models, and are typically used for high-pressure cutout. The C models are automatic reset. The D models have a manual reset lockout mechanism. Some P70C, P70D P170C and P170D models are UL Listed as refrigeration pressure limiting controls.