P77AAA-9351 P77 and P78 Series Pressure Controls

Description

Overview

Essential details：P77AAA-9351 P77 and P78 Series Pressure Controls

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 noncorrosive 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.
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.

P77AAA-9351

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P77AAA-9351 P77 and P78 Series Pressure Controls

These controls are available in several pressure ranges and are compatible with most common noncorrosive refrigerants. Type 1 enclosures are standard on these models.
P77 and P78 Series Control models are typically used for high or low pressure cut-out applications, condenser fan cycling, and pump-down control. SPDT switches allow you to install alarm devices or other control circuits.
Low-pressure P77BCA Type, high-pressure P77BEA Type, and dual-pressure P78MCA Type models with Manual Reset Lockout lock out when the cut-out pressure is reached and do not automatically reset when the pressure changes after cut-out, providing shutdown capability for unmonitored equipment.

A pressure-actuated bellows on the control is connected to a pressure tap on the controlled system by a capillary or a field-installed hose. The bellows responds to system pressure changes and operates a snap-action electrical switch.
On most dual pressure control models, the two bellows are mechanically interconnected to operate a single switch. The switch is typically wired to provide control of the refrigeration or air-conditioning compressor and condenser fans. On some models, the switch may also be wired to control alarms or other auxiliary devices.