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Rectangular Damper Installation Instructions
CAUTION
1. Sharp edges may cause serious injury from cuts. Use care when cutting openings and handling duct work.
2. A zone control system may not control temperature properly unless the HVAC system is correctly sized and balanced.
3. Install dampers in supply ducts only, and as close to the heating and cooling equipment as possible.
The position of the damper blade, as supplied, is in the open position. The damper is power-closed/spring-opened, and must be wired
to the zone control panel damper terminals that supply the required 12 VA at 24 VAC. (See zone control panel installation instructions
for specific wiring details.)
APRILAIRE RECTANGULAR DAMPER INSTALLATION PROCEDURE
Step 1: Cut a 4-1/4” slot in the duct wall. Locate slot in side of
duct for side-mounted dampers, and in the bottom of
the duct for bottom-mounted dampers.
Step 2: Gently rotate the damper blade(s), to fit into the cut
slot then slide the damper into the slot until the
faceplate meets the duct wall.
0-1419
9
Preset Adjustable Stop Position
ADJUSTABLE STOP
Each Aprilaire Damper has an adjustable stop screw whose
position determines the amount of rotation the damper blades
make when energized. The stop screw is factory preset to a
position that allows the correct amount of predetermined
bypass air to go through the damper. To adjust the factory
preset bypass setting loosen the stop screw, adjust accordingly
and tighten the screw in place. To completely close the blades,
loosen the stop screw and move it to the closed position.
Step 3: Secure faceplate to duct using 1/2 inch long sheet
metal screws (not included).
Step 4: Insulate the same as ducts. Do not insulate actuator.
NOTE: Support all duct work in accordance with local code
or SMACNA standards.
W
4-1/4”
H
DO NOT
INSULATE
ACTUATOR
90-1420
10009392 4.11
B2205467B
P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 • www.aprilairepartners.com
Printed in U.S.A.
© 2011 Aprilaire – A division of Research Products Corporation
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