Greenheck CRD Series Installation Manual

Document #481550

Field Instructions for Installing a Volume

®

Controller on CRD Series Dampers

Installation Manual

These instructions apply to the field installation of Volume Controller on CRD series dampers.

Tools Required:

Electric or battery operated drill

Locking C-clamp or spring clamp

3

⁄32 dia. drill bit

#2 Phillips screwdriver

Wire cutter

Instructions

1. Remove the existing fusible link and allow the
damper blades to close. While doing this check that
the blades operate smoothly and go to their closed
position.

2. Insert the drill guide (Figure 1) between the spring
and the damper center bar. Using the notches at the
center of the drill guide, align the center of the drill
guide with the spring. Open the damper blades to
allow the drill guide to settle onto the damper center
bar.

Secure the blades in the open position. The blades

can be held open using a clamp or by reinstalling the
fusible link. (Figure 2) (Note; If the drill guide does not
fit over the damper center bar, the tabs on the guide
can be bent outward, equally on both sides, until it
fits over the center bar.)

3. Using the two small holes in the drill guide, drill two

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⁄32 diameter holes through the damper center bar.
(Figure 3) Release the damper blades and remove the
drill guide.

4. Using a wire cutter, cut off the fusible link wires near
the rivet head. They are no longer needed. (Figure 4)

5. Install the volume controller onto the damper center
bar using the (2) #10 screws provided. Tighten the
screws but be careful not to strip out the screw holes.
(Figure 5 & 6)

Note: Do not use longer screws since longer screws will

interfere with the operation of the blades.

Figure 1: Drill Guide Figure 2: Clamping the

blade open

Figure 3: Drilling the holes

using the drill guide

Figure 4: Removing the

fusible link wire

Volume Controller for CRD Series

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6. Manually operate the blades to check for binding or
interference.

7. Check that the volume controller lift wires do not
interfere with the frame of the damper.

8. Adjust the volume controller to the desired open
position.

Figure 5: Volume controller

Figure 6: Volume controller top view

®

Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website: www.greenheck.com

481550 Volume Controller for CRD Series IOM Rev. 1 April 2016 Copyright 2016 © Greenheck Fan Corporation

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