What does a zone damper do?
A zone damper (also known as a Volume Control Damper or VCD) is a specific type of damper used to control the flow of air in an HVAC heating or cooling system. In order to improve efficiency and occupant comfort, HVAC systems are commonly divided up into multiple zones.
How is bypass damper calculated?
Use the following equation to help size bypass dampers for the correct airflow: Bypass Airflow (cfm) = Unit Airflow (cfm) – All Zones Minimum Airflow (cfm). To size the damper, select a damper based on calculated bypass cfm and a maximum velocity between 1,750 and 2,250 FPM.
How do you tell if dampers are open or closed?
A visual check is one of the surest ways of checking whether the damper is open or not. Simply stick your head in the fireplace and look up. If you have a throat damper, the closed damper immediately above your head will block your vision. You should be able to reach up and touch the closed damper.
How does a zone damper work on a bypass duct?
The damper inside either allows or prohibits air from entering the bypass duct, depending on the situation. Let’s say you’ve got a two-story home with two zones, one for each floor. When the system is cooling both floors, all of the zone dampers are open so that air can flow everywhere.
When does a bypass damper close and open?
When the correct size bypass damper is installed and adjusted properly, it will be fully CLOSED when all zones are calling (no air bypassing) and will OPEN proportionately as zone dampers close. THE ECOJAY MODULATING BYPASS DAMPER INCLUDES THE STANDARD POWER DAMPER WITH A PRE-WIRED STATIC PRESSURE SWITCH.
How to control excess static pressure when zone dampers are closed?
To control the excess static pressure at the time when zone dampers remain closed, the excess air needs to be redirected. Apart from that, another duct needs to be installed instead of drilling a hole in your ductwork.
How do I adjust the clbd bypass damper?
The model CLBD Bypass Damper is an easy and economical way to manage system static pressure, in a zoned HVAC system. Damper adjustment is easily achieved by increasing or decreasing the force applied to the bypass damper blade, until the desired static pressure is achieved. Questions? Contact us.