Product Overview

Specifications:
Pressure Set point Range - .1" to 4" W.C.
Sensing Element - Reevecote diaphragm
Electrical - Two Field Connections (24VAC)
Pressure - Barbed for 3/8" OD plastic tube
Case - Cast Aluminum & 3/4" conduit opening
Mounting - The Pressure Switch should be oriented
so that the adjustment stem is pointing
vertically up. (If necessary, loosen the mounting
bolt and adjust the pressure switch.)
How the Bypass System Works:
As the individual zone dampers open and close, the
system static pressure will rise and fall. In order to
maintain proper air flow and static pressure through
the HVAC system, a bypass system incorporating a
reversible type motorized damper and a static
pressure control is used. The static pressure control
monitors the static pressure and energizes the
damper motor open or closed, to maintain the
desired airflow and static pressure. The damper
will modulate to hold the desired Static Pressure
Set-Point.
Description of Bypass Dampers:
ROUND BYPASS DAMPERS are fabricated from 20,
22, & 24 gauge galvanized steel. Shells are
furnished with one straight end and one crimped
end with rolled-in stiffening beads for rigidity.
RECTANGULAR BYPASS DAMPERS are fabricated
from mill finished, extruded 14 gauge aluminum,
parallel blade design.
All round bypass dampers are equipped with low
leakage blade seals.
*Shell length=Diameter + 0.75
*Medium duty - up to 1”W.C.
*Heavy duty - up to 2”W.C.
*Specify round - 8”, 10” , 12”, 14”, 16”,18”, 20”
*Specify rectangular - 12x8,12x10,12x12,20x8
20x10,20x12
*Custom sizes are available, call for
details.
Description of Static Pressure Control:
The static pressure control is a heavy duty air pressure
switch, with a sensitive diaphragm.
An integrated micro-switch and a visual ON/OFF
indicator are also included. The spring adjustable
switch has dual scales calibrated in millimeters and
inches of water column for easy setup.
The Electronic Bypass design includes the Model
MA-AC1 Motor Actuator with Open & Closed LED
indicators for Medium Duty applications, and a
rugged LM-24 Belimo motor for Heavy Duty
applications!
Both models are designed to be easy to install and
service in the field.
TM
Forced Air Zone Controls
Model EBD
Electronic By-Pass Damper
SUBMITTAL SHEET
Separate 24 vac
20 va Transformer
Or Connect to M1/M2
on any EWC Controls
Zone control module.
“EBD” ELECTRONIC BYPASS MOTOR
AND STATIC PRESSURE CONTROL
DAMPER ASSEMBLY
Field Wiring =
Factory Wiring =
Note: Remove cover off of diaphragm to field wire.
NC
NO
C
WIRE
NUT
1
4
6
MA-AC1
MOTOR
PS4
PRESSURE SWITCH
385 Hwy. 33
Englishtown, NJ 07726
Ph: 800-446-3110
Fx: 732-446-5362
P/N 090377A0061 REV. I 04.08.10
CONTROLS INC.
E
W
Excellence Without Compromis
e
Copyright © EWC Controls Inc., 2000 All Rights Reserved
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