Aprilaire 6908 Installation Instructions

MODEL 6908, 6910, 6912, 6914 AND 6916 BAROMETRIC BYPASS
DAMPER INSTALLATION INSTRUCTIONS
CAUTION: Sharp edges may cause serious injury from cuts. Use care when

1. IDENTIFY BYPASS DAMPER POSITION IN SYSTEM

Identify where the bypass damper is to be installed. The bypass damper must be
located downstream of any heating or cooling components and upstream of all
zone dampers.
The damper may be installed in a horizontal or vertical (upflow) position. It is
recommended that the damper be installed horizontally. The location of the
damper should allow for clearance around the
balancing mechanism for free rotation.
2. INSTALL THE BALANCING
MECHANISM
Install the balancing mechanism collar on
either end of the damper blade shaft and lock
in place with bolt provided. Based on the
damper orientation, move the balancing
mechanism to the position appropriate for the
orientation of discharge (see Figure 1). Lock
into place with the nut provided.

3. INSTALL THE DAMPER TO THE DUCTWORK

 Install the damper with crimped end downstream.
 For horizontal installation, rotate the damper
such that the damper blade shaft is parallel to
the floor and located above the damper
centerline (see Figure 2).
 Secure the damper to the duct with ½" long, #8
or #10 sheet metal screws (not included).
 Insulate the damper. Leave clearance for free
rotation of the balancing mechanism.
ZONE CONTROL SYSTEM
cutting and handling ductwork.
Figure 1 - Install the Balancing Mechanism
CORRECT
Figure 2 - Horizontal Installation
NOT CORRECT