35
ELECTRONIC BYPASS DAMPERS
Bypass dampers are used to provide constant air delivery through the air handling
unit. This is done by bypassing excess air from the supply duct back to the return
duct. As a zone is satisfied its zone damper closes. When this happens, the bypass
damper opens just enough to bypass the excess air. This will control static pressure
and noise at the diffusers.
The Electronic Bypass Damper is used on any size system over 5 tons. The damper
can be round or rectangular and multiple dampers can be slaved together. The
Electronic Bypass Damper consists of a medium pressure round or a heavy duty
rectangular damper and a static pressure sensor.
SIZING ELECTRONIC
BYPASS DAMPERS
The bypass damper is to be sized for the total system
CFM @1500 FPM. System CFM should be calculated at
400 CFM per ton.
Example:
A 5-ton system is rated at 2000 CFM
(5x400 = 2000). When calculated at 1500 FPM, the
bypass damper should be 16”. Never undersize the
bypass damper.
ROUND BYPASS
DAMPER SELECTION
The Zonex Systems STMPD damper is used for round
bypass applications. When you know the bypass CFM
requirements, use the ROUND BYPASS SELECTION
TABLE to confirm the round damper size.
NOTE: multiple round dampers can be slaved from one
static pressure control to provide the correct capacity.
One large rectangular bypass damper may be used
instead of multiple round dampers. See below.
RECTANGULAR BYPASS
DAMPER SELECTION
The Zonex Systems STCD WxH damper is used for
rectangular bypass applications. These dampers are
also sized for the total system CFM rated at 1500
FPM. Multiple dampers can be slaved from a single
static pressure control.
L
D
W
RECTANGULAR & ROUND BYPASS DAMPER
WITH THE STATIC PRESSURE CONTROL
RECTANGULAR BYPASS DAMPERS
SELECT FROM 8 X 8 THRU 48 X 48
DEPTH
H
16”
W
WIDTH
HEIGHT
D
H
48" MAXIMUM WIDTH
4"
W
PART # STCD W x H
BYPASS DAMPERS – ELECTRONIC
Diameter
CFM
8”
560
10”
900
12”
1250
14”
1700
16”
2200
18”
2600
ROUND BYPASS SELECTION TABLE
PART #
SIZE
D
L
W
STMPD08
8
8" 10" 11"
STMPD10
10
10" 12" 13"
STMPD12
12
12" 14" 15"
STMPD14
14
14" 16" 17"
STMPD16
16
16" 18" 19"
STMPD18
18
18" 20" 21"
Содержание ZonexCommander
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Страница 15: ...15 ZONEXCOMMANDER PLUS COMPONENT SELECTION GUIDE...
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