Introduction - PENN Controls - LIT-12012399 - P77AAA - P77BCA - P77BEA - P78LCA - P78MCA - Electromechanical Pressure Control - P77 Single Pressure Control - P78 Dual Pressure Control

P77 and P78 Series Controls for Single and Dual Pressure Applications Product Bulletin

Brand
PENN Controls
Product name
P77 Single Pressure Control
P78 Dual Pressure Control
Document type
Product Bulletin
Document number
LIT-12012399
Revision date
2020-10-28
Language
English

The P77 and 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.

The P77 Series Controls for high or low pressure applications are designed for single pressure control of commercial refrigeration and air-conditioning 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 1. P77 Single Pressure Control

Figure 2. P78 Dual Pressure Control