bypassdamperinformation Biblioteca seguridad jacksonsystems

SUPPLY AIR

necessary.

of this difference at 2,500 FPM

Barometric Bypass Dampers

SHOWS POSITION OF ARM WHEN

7.5 TONS USE 14"

DAMPER IS FULLY CLOSED

toward the end of the rod. To decrease the system pressure move the weight inward toward the damper shaft. To

SIZING BASED ON

HOW THE BYPASS DAMPER WORKS

As the individual zone dampers close, the system static pressure will tend to rise. In order to maintain constant

With the HVAC unit running, adjust the weight located on the rod so that the bypass damper is fully closed when

RETURN AIR

insure that all zone dampers are in the open position while adjusting the bypass damper, disconnect one of the two

The bypass damper should be installed in such a way as to connect the supply air duct to the return air duct. The

3 TONS USE 10"

For systems larger than 7.5

system CFM, then size the

Comfort SystemTM

01-15-2005

WHEN DAMPER IS FULLY OPEN

bypass damper to handle 100%

airflow through the HVAC system, a barometric bypass damper will be required to bypass some of the discharge air

Fax: 317.227.1034

SHOWS POSITION OF ARM

info@jacksonsystems.com

back into the return. These bypass dampers can be used on systems with static pressure ratings up to 0.75" W.C.

317.788.6800

smallest zone from the total

BYPASS DAMPER

General Instructions for Residential and Light Commercial

return air plenum if possible

2.5 TONS OR LESS USE 8"

4 AND 5 TONS USE 12"

wires to each of the spring return open damper motors. Additional weights can be added to bypass damper arm if

damper should be installed in the horizontal position. Tap into the return air duct at least two feet back from the

UNIT

www.jacksonsystems.com

COOLING TONNAGE

5418 Elmwood Avenue Indianapolis, IN 46203-6025

tons, subtract the CFM of the

HVAC

INSTALLING THE BYPASS DAMPER

ADJUSTING THE BYPASS DAMPER

all zone dampers are in the full open position. To increase the system static pressure move the weight outward