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PENN Controls Products Catalog

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P78 Series Controls for Dual Pressure Applications Description P78 Series Pressure Controls are designed primarily for high and low pressure cut-out control, pump- down control, condenser fan cycling, and capacity control on commercial refrigeration and air- conditioning applications. These 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. Controls also are available in several different electrical ratings and Single-Pole, Double-Throw (SPDT) switch configurations. Refer to the P77 and P78 Series Controls for Single and Dual Pressure Applications Product Bulletin (LIT-12012399) for important product application information. Features and benefits Splash-proof enclosure Built to provide 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. Manual reset lockout option Provides trip-free lockout that cannot be overridden or reset until pressure returns to a specified level. Generous wiring space Provides ample space for easy wiring and maintenance. Applications The P78 Series Controls for dual pressure applications are designed primarily for use as combination high and low pressure controls on commercial refrigeration and air-conditioning applications. Figure 64: P77 Pressure Controls with 7/16-20 UNF 6 mm (1/4 in.) flare fitting dimensions, mm (in.) Figure 65: Capillary connector dimensions, mm (in.) 158

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