Greenheck 481481 Fusible Link Replacement for Volume Controller Operating instructions

Brand: Greenheck

Model: 481481 Fusible Link Replacement for Volume Controller

Type: Operating instructions

Greenheck 481481 Fusible Link Replacement for Volume Controller is a replacement part for a volume controller. It is used to replace a fusible link that has separated, causing the damper blades to close. The fusible link is a safety device that protects the volume controller from damage in the event of a fire. The replacement link is easy to install and does not require the removal of the main bracket from the damper.

Document 481481

Installation Instruction Supplement

for Models CRD

Fusible Link Replacement for

Volume Controller

Instructions

When the fusible link separates the damper blades will close. Turning on the adjustment screw will no longer have an effect on the

blades. If the fusible link has separated, it will need to be replaced. Do not drill out the rivets that secure the main bracket to the

damper support bar. The fusible link can be replaced without removing the main bracket from the damper.

Replacing the Fusible LInk Assembly

1. The outer link housing (see Figure 2) has four formed tabs that

overlap the main bracket. These tabs keep the link assembly

centered in the bracket and provide a contact surface for the

wire lift arms. Turn the adjustment screw clockwise until the

U-shaped inner channel component of the link (see Figure 2) is

pulled back into the outer housing.

2. Remove both wire lift arms by squeezing it together until the

ends come out of their pivot holes. To do this, you will need to

lift the blade and rotate the arm to clear the outer link housing

tabs.

It is possible to remove the broken link with only one wire

removed but, it would be easier to do the next steps if both

wires are removed from the bracket.

3. Remove the E-clip that is on the bolt head. Do not discard.

4. Push the bolt out of the bracket. The bolt and the broken link

components can be removed from the bracket by rotating it

sideways and pulling it out of the bracket.

Volume Controller Assembly

Fusible link

inner channel

Fusible link

outer housing

Tabs

Figure 1

Figure 2

Volume Controller Assembly

Adjustment

screw

wire lift

arm

wire lift

arm

5. Rotate the damper blades by hand to check that there are no

interference issues that need to be addressed. The damper

blades should rotate smoothly.

6. Remove the screw from the broken fusible link and put it into

the new fusible link. Turn the screw all the way into the new

link.

7. Place the link and bolt assembly back into the main bracket

using the same method used to remove the old link. Once the

four formed tabs clear the bracket edges, the assembly can be

rotated and the bolt head can be placed back into the bracket

hole.

8. Install the E-clip onto the bolt head.

9. Lift the blade and install the wire lift arms back into their

appropriate holes. Once installed, the wires should set back

onto the formed tabs that overlap the main bracket.

10. Make the ﬁnal adjustments to the damper blades by turning

the screw counterclockwise until the blades are at the desired

open position.

481481 CRD Fusible Link for Volume Controller

Rev. 1 February 2016

Greenheck 481481 Fusible Link Replacement for Volume Controller Operating instructions

Greenheck 481481 Fusible Link Replacement for Volume Controller Operating instructions

Greenheck 481481 Fusible Link Replacement for Volume Controller Operating instructions

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