VA7820-HGA-2 Johnson Controls Actuator

Overview

The Johnson Controls VA7820-HGA-2 is a spring-return electric valve actuator designed to control VG7000 Series bronze globe valves in heating, ventilating, and air conditioning (HVAC) systems. It provides fail-safe proportional control regulated by an electronic controller, ensuring that the actuator stem fully retracts and the valve stem moves to the full up position in the event of a power loss.

Features

• Proportional control from the factory, field-configurable to on/off or floating control via DIP switches
• Spring-return fail-safe functionality that fully retracts the actuator stem on power loss
• Automatic stroke adjustment for quick and precise commissioning and servicing
• Brushless motor for low energy consumption and extended operating life
• Manual override capability as a standard feature using a 5 mm Allen wrench
• Multicolored status LED providing visual operational status and diagnostics

Specifications

• Force: Minimum linear output force of 180 lb (800 N)
• Supply Voltage: 24 VAC nominal, 11 VA rating
• Control Signals: 0 to 10 VDC, 2 to 10 VDC, 0 to 20 mA, or 4 to 20 mA
• Feedback Signal: 0 to 10 VDC or 2 to 10 VDC position indication
• Linear Stroke: Housed for 5/16-inch to 1-inch stroke capabilities (8 mm to 25 mm)
• Enclosure Rating: IP54 protection against dust and moisture

Applications

• Designed for field mounting or factory coupling to 1/2-inch through 2-inch Johnson Controls VG7000 Series bronze globe valves
• Suitable for chilled water, hot water, and glycol solution control in commercial HVAC systems
• Used in steam control applications (up to 35 psig for brass trim and up to 100 psig for stainless steel trim)
• Integrates with building automation systems for precise environmental control