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Old 06-08-2009, 10:07 AM   #1
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HVAC Squeal. What Is This Component?


We have traced a sound at work to an HVAC component installed on a duct. Can anyone tell me what this componet does? It is emitting a high pitced squeal when it activates about once an hour. We are worried the device is gone bad given the noise but are affraid to deactivate it not knowing if it is essential to the system.

video
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Old 06-08-2009, 10:18 AM   #2
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Shaft needs lubing. I got some Vaseline

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Old 06-08-2009, 11:05 AM   #3
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I got some wd40 and some 3in1 oil. That should do it I imagine.

Can the lube be done in tact or do you reccommend disassembly then lube?
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Old 06-08-2009, 02:37 PM   #4
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No. Use non detergent oil. also could be the drive motor bearing has given up the ghost.
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Old 06-08-2009, 05:08 PM   #5
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I think its a Carrier CCN zone damper.

Be careful where you spray WD40.
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Old 06-08-2009, 05:39 PM   #6
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WD 40 is a solvent with minimal lubricating quality in comparison to to non detergent oils.

Older bearings could wash out what lube is left with WD 40 and freeze the damper completely.
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Old 06-10-2009, 11:47 AM   #7
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Thanks, no wd40 got it.

Also thanks for the tip, after reseach I beleive you are correct it is a carrier zone damper . I think something may be wrong with it though . If it is an actuator a assume it actuates to an on or off position correct?

If my assumption is correct wouldn't it actuate on or off only occasionally due to whatever it is designed to detect? It is currently actuating for periods over an hour where the shaft moves back and forth continuously squeaking with each motion.
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Old 06-10-2009, 01:57 PM   #8
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It could be intermitantly be losing its signal from the controller.
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Old 06-10-2009, 04:30 PM   #9
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Quote:
Originally Posted by NewbDIY View Post
It is currently actuating for periods over an hour where the shaft moves back and forth continuously squeaking with each motion.
"Hunting is a self-exciting oscillation of a system, and is common in systems which incorporate feedback. It is an important phenomenon in many fields, including engineering, economics and biology. . ."

It could have become underdamped but I think the lost signal idea is more plausible.

Last edited by Yoyizit; 06-10-2009 at 04:49 PM.
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Old 06-10-2009, 05:37 PM   #10
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Quote:
Originally Posted by Yoyizit View Post
"Hunting is a self-exciting oscillation of a system, and is common in systems which incorporate feedback. It is an important phenomenon in many fields, including engineering, economics and biology. . ."

It could have become underdamped but I think the lost signal idea is more plausible.

Ok thanks I'll get an expert in to look, and thanks for giving me enough info to help describe the issue.
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Old 06-12-2009, 06:38 AM   #11
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You probably want it to be
http://www.google.com/search?client=...UTF-8&oe=UTF-8

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