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The IO HVAC CONTROLS EB-2422 is a heavy-duty motorized bypass damper designed to regulate airflow in zoned HVAC systems. When zone dampers close and static pressure builds in the supply duct, this bypass damper opens to redirect excess air back to the return side, protecting the blower and maintaining system balance. The unit measures 24 x 22 inches at the duct opening and ships at 15.76 pounds. Licensed HVAC technicians typically install this component as part of a multi-zone forced-air system where pressure relief is required to prevent equipment damage and maintain designed airflow rates.
The EB-2422 is suited for residential and light commercial zoned forced-air systems where supply duct static pressure must be controlled. It is installed inline between the supply plenum and return plenum or a dedicated bypass duct. The motorized actuator responds to a control signal from the zone control panel, opening and closing automatically as zone dampers cycle. This makes it a functional component in any zoned system where total airflow demand can drop significantly below the air handler output capacity.
Designed as an OEM-style motorized bypass damper for use in residential and light commercial zoned forced-air HVAC systems requiring supply-to-return pressure relief.
Installation should be performed by a licensed HVAC technician familiar with zoned duct systems and low-voltage control wiring. Shut down the air handler and de-energize the zone control panel before making any duct or wiring connections. Ensure the bypass duct is sized and routed per the equipment manufacturer guidelines and applicable mechanical codes. Verify actuator control wiring matches the zone controller output terminals before restoring power.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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