HVAC Controls EZ-BD Series Installation Manual

EZ-BD-XX Barometric Bypass Damper
Principle of Operation:
As individual zone dampers open and close, the HVAC system static pressure changes. In
order to maintain design airflow and static pressure, as well as prevent air noise, the EZ-BD
bypass damper is used to direct a portion of the air from the main supply duct back to the
return duct. EZ-BD bypass dampers can be used with systems having static pressure of up to
0.75" w.c.
Installing The EZ-BD:
Depending on the HVAC duct work configuration, the bypass damper should be ducted from
the main supply air plenum to the return air duct. The bypass damper should always be
installed in the supply air duct before any zone dampers. The EZ-BD can be mounted
horizontally, but only vertically with upward airflow (see next page for details). Make sure that
the air flow direction arrow located on the bypass damper label is pointing towards the return
air duct.
Decrease
Static Pressure
Setpoint
Installation Manual
EZ-BYPASS
Increase
Static Pressure
Setpoint
To
Return
Adjustment
Lever
Adjusting The EZ-BD:
The EZ-BD is factory-calibrated for roughly 0.4"
w.c., which should fit most applications, but it can
be adjusted. To increase the static pressure
setpoint, turn the lever clockwise, which will
improve airflow in the system. To decrease the
setpoint, turn the lever counterclockwise, which
can help reduce noise in the system.
EZ-BYPASS
AIR FLOW
From
Supply
EZ-BYPASS