Rattle in MA-ND4 Acuator Damper

[Dragon]

Hello,
I have a MA-ND4 actuator and damper installed on my air handler. When the system calls for AC the damper functions (opens and closes) just fine.

The issue I have is that when the blower on the unit increases speed for the AC airflow the damper rattles. I am getting some kind of flutter in the blades and it is noisy enough to hear upstairs through the duct vents.

What can I do to the unit to eliminate this rattling?

[Eric K.]

Does this occur if all zones are open or when it is the only zone calling?

Is there a by-pass damper installed on this system?

Eric

[Dragon]

Yes, there is a bypass damper.

There are 2 zones supplied by 4 dampers. One zone is the 1st floor and the 2nd is the basement.

The problem occurs when only the primary upstairs zone is running. Off the top of my head I cannot verify 100% if the rattle is also occurring when the downstairs zone is calling. I will force it to run tonight with the downstairs on to confirm if the rattle also occurs under those conditions.

[Eric K.]

Please contact me at the number below.

Eric

[hobscheidt@yahoo.com]

I also have rattling with my MA-ND5, loudest when all other zones are satisfied and the heat pump is on a lower fan speed. The noise is coming from the rivets in the damper. Any suggestions?

[Ric]

Hobscheidt,

Finding the cause of a rattle can be a difficult process. We can guide you through troubleshooting the problem. Please contact Paul in tech support by calling EWC Controls at 732-446-3110 ext. 490.

[Squitich35]

Hobscheidt,

Finding the cause of a rattle can be a difficult process. We can guide you through troubleshooting the problem. Please contact Paul in tech support by calling EWC Controls at 732-446-3110 ext. 490.

lots of thanks Ric, i really appreciate this. if i would have some questions, can i ask you directly?

[Ric]

Squitich35,

Paul handles the direct trouble shooting. Please call him at 732-446-3110 ext. 490.