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TAMCO MEDIUM-DUTY BACKDRAFT DAMPER
For Series 7000 WT & 7000 CW
SERIES 7000 W T
> Series 7000 WT Weighted Backdraft Dampers have a round,
adjustable weight and a threaded post secured to the center of
each blade. A zert nut on the back of the blade is used to lock the
threaded post in place.
> Each cylindrical, steel weight measures 1¼" (32 mm) in diameter.
> Weights are supplied, so that the required resistance to the
opening of the blade against airflow can be achieved.
> The cylinder can be adjusted away from or towards the blade, as
far as the threaded post will allow.
> Moving the weight away from the blade will increase the amount
of additional pressure and airflow required to open the backdraft
damper blades.
> Moving the weight closer to the blade will decrease the amount of
additional air pressure and airflow required to open the backdraft
damper blades.
> Additional weights may be added to increase the desired pressure
build-up before the backdraft damper begins to open.
> Adjust weight placement until desired pressure build-up is
achieved. (Several re-adjustments may be necessary for desired
operation.)
> Once adjustment is completed, tighten the weight locking nut to
prevent weight from moving out of position.
SERIES 7000 CW
> Series 7000 CW Counterweighted Backdraft Dampers have an
adjustable ¾" wide (19 mm) aluminum, counterweight bar attached to
the back of the blades (with the exception of the top blade).
> The aluminum bar bracket is centered along the length of the
blade. This is designed to apply even pressure across each blade.
Do not move the bar bracket away from the factory-aligned center
of the blade.
> Counterweights can be set to relieve air pressure differentials less
than .01 in. w.g. (3 Pa).
> To accelerate blade opening, move the aluminum counterweight
bar further away from the blade.
> To delay blade opening, move the aluminum counterweight bar
closer to the blade.
> To move the aluminum counterweight bar, first loosen the two
socket head cap screws with a
Do not remove the screws. (The socket head cap screws secure the
aluminum counterweight bar in place, through the washer and the
aluminum bar bracket.)
> Slide the aluminum counterweight bar in the direction required to
achieve desired blade operation. The counterweight bars should
be adjusted to the same location on each blade, to ensure that
even pressure is applied across the entire backdraft damper.
(Several re-adjustments may be necessary. Keep in mind that
depending on external conditions and damper size, moving the
aluminum bar to the furthest point away from the blade might
prevent the backdraft damper from closing.)
> Once adjustment is completed, re-tighten socket head cap screws.
© T.A. Morrison & Co. Inc., 2020
3
/
" (4.8 mm) Allen/Hex wrench.
16
| Weight Adjustment
Adjustable
Weight
Weight
Locking Nut
Zert Nut
Adds more
resistance
to opening
Backdraft
Damper Blade
Linkage
Rod
www.tamcodampers.com
Linkage
Rod
Backdraft
Damper Blade
Aluminum
Counterweight
Bar
Aluminum
Bar Bracket
Washer
Socket Head
Cap Screw
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