How does a fresh air damper work?
The Fresh Air Damper (FAD) is a 24VAC power-open, power-close motorized air damper designed for installation in a fresh air ventilation duct connected to an outdoor air intake hood and a duct fan or the HVAC return plenum, to control the flow of fresh air into the home.
How does a damper end switch work?
End switches are typically wired to a fan and/or to a light serving as an open/not open indicator. When the damper is powered open, one of the damper blades makes contact with the spring rod of the end switch which in turn makes a connection allowing power to flow to the fan and/or light.
How does a make up air kit work?
Make-up air is designed to “make up” the air in your interior space that has been removed due to process exhaust fans. This type of HVAC solution pulls in fresh, tempered air from outside your building to replace existing air that cannot be recirculated.
What does a mixed air damper do?
The mix of fresh air and recirculated air can thus be adjusted to suit the needs of the building’s occupants. Most systems will use motorized dampers to control the air mixing, and controlled by the building management system (BMS), or controls system.
How do you close a fresh air intake damper?
Closing the Supply of Air from Outside By blocking it, you could strain the system or, in the case of an intake serving a furnace, cause negative pressure that causes fumes and carbon monoxide to back up. That being said, you can safely close an intake vent by sliding the dampers into the closed position.
What is a damper position switch?
They are mounted on a horizontal damper shaft to provide opened/closed indication. Switch contacts are normal when the cable end of the switch is horizontal or above, and makes when the cable end drops more than 15º below horizontal.
What is an end switch on an actuator?
An ‘End Switch’ is an electric switch mounted on the motor linkage that will stop the motor movement when it reaches that 80-degree limit by opening the electrical circuit to the motor.
Where should a make up air damper not be installed?
• Make-up air damper should not draw air from crawlspaces, garages, attics, adja- cent dwelling units, or any enclosed part of the building. The Damper should be installed to draw air directly from outdoors. Outside Air Intake Opening Protection
What color wire do you use for damper actuator?
Wiring for Damper Actuators and Control Valves On/Off, Spring Return, 24V Blk (1) Common Red (2) + Hot 24 VAC Transformer Line Volts 2 3 5 Actuators with plenum rated cable do not have numbers on wires; use color codes instead.
How do you Power a fresh air damper in wgmfad?
MOTORIZED. FRESH AIR DAMPER. MODEL. WGMFAD WGMFAD Manual: C. Supersedes: The damper blade is powered by a VAC motor with spring return on power loss. The damper is powered. INTAKE DUCT AND MOTORIZED DAMPER Disconnect electrical power before wiring the FAVS to the equipment.
What are the requirements for a 641fa damper?
Because the Damper, together with the end cap and outside air duct which are installed with it, will allow outdoor air into the indoor environment, it is important to meet the following requirements: • Model 641FA (6”) and 643FA (8”) fresh air inlet wall caps include protective bird screens to keep out animals and outside debris.