Product Overview

Installing the Bypass Damper and Static
Pressure Control Assembly:
The bypass damper should be installed with the
bypass air being discharged back into the return air
plenum or above the ceiling if this area is used as a
common return.
(See drawing).
Mount the pitot tube within 5 feet of the air handling
unit, down stream of the By-Pass duct, on the
center line of a straight section of supply duct
(Observe direction of airflow arrow stamped on
pitot tube mounting plate). The pitot tube is a 5”
length of 1/4" O.D. rigid tubing to be connected to
the pressure control with 3/8" O.D. plastic tubing,
The High-pressure tap of the static pressure
control must be connected to the pitot tube. The
Low-pressure tap must be left open to
atmosphere. Keep the 3/8” plastic tubing as
short as possible with no kinks. The pitot tube,
plastic tubing, and mounting hardware are
furnished with the Bypass Damper assembly.
Adjusting the Static Pressure Control:
Before adjusting the pressure control, the installer
should confirm the following:
(1) The HVAC System is functioning properly.
(2) The system has been properly balanced.
(3) The zone system is operating properly.
(4) All zone dampers are in the open position.
How To Proceed:
With the air handler running at the highest speed & full
CFM rating and the bypass damper system powered,
turn the static pressure adjusting screw until the top of
the screw aligns with the static pressure scale setting
you require. (Factory setting is .5” W.C.) Observe that
the bypass damper should be closed when all zone
dampers are open. If it’s open or partially open, adjust
the set point for a higher static. Then, start to close off
one or more zone dampers and observe as the static
pressure control senses the increased air pressure
and modulates the bypass damper, to maintain the
set point you have chosen.
385 Hwy. 33 Englishtown, NJ 07726
Ph: 800-446-3110 - Fx: 732-446-5362
CONTROLS INC.
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Forced Air Zone Controls
Note: This drawing of the Bypass damper static pressure control and related duct work is intended to serve only as a guide,
your actual duct work layout may differ substantially.
Bypass Damper and Static Pressure Control Assembly
HVAC
UNIT
Return air Supply air
Pitot Tube
Static Pressure
Control
24 Volt 40 VA
Transformer
or
UltraZone Control
Panel
Damper
Motor
By-Pass
Damper
Model EBD
Electronic By-Pass Damper
6’
6’
Note: The pressure switch should be mounted as close to vertical as possible to ensure proper operation.
Use 3/8” O.D.
Plastic tubing
P/N 090377A0061 REV. I 04.08.10
SUBMITTAL SHEET