I love my system:  3-ton split for the 2nd floor, 6-ton Synergy for the main and basement.  The main and basement levels heat via radiant.  My problem is that my HVAC contractor has had to conduct 2 repairs for refrigerant leaks.  The first was in a pipe joint, the second required replacement of the forced air heat exchanger.  Upon shutdown, the unit emits a loud noise which sounds to me like hydraulic hammer.  I'm afraid this is actually the root cause of my 2 repairs and will result in future refrigerant system compromises.  Is this loud shutdown cycle normal for a Waterfurnace Synergy???

basvatek,

We will be more than happy to look into your inquiry further. Could you provide your model number, serial number, and the name of your installing contractor? If you do not want to post this information publicly, please feel free to send us a private message.

WaterFurnace International, Inc.

BTW, Iowa, turned on March 2010, 7000 sqft, $275 winter heating bills at 5 cent per KW-hr rate.

SDV072B121CTLAP, 100100793, Kraus Plumbing Monticello IA, thanks so much!!!

basvatek,

Thank you for the additional information. We have received a site visit request from your contractor and are reviewing the information we have received. As soon as we have finished our review, we will be in contact with you.

WaterFurnace International, Inc.

I've recorded the sound and shutdown cycle.
http://www.youtube.com/watch?v=RPWygWXUMtU

Basvatek,

On March 1st, we forwarded the site visit request for your unit to our field technician, who you spoke with today. We have been and will continue to work with you and your contractor to find a resolution.

basvatek, any update to this.
I just listed to your recording and it sounds exactly like our Synergy 3D system. Just like to know if we should be concerned or not.

Thanks

Posted By basvatek on 22 Feb 2011 10:10 PM
I love my system:  3-ton split for the 2nd floor, 6-ton Synergy for the main and basement.  The main and basement levels heat via radiant.  My problem is that my HVAC contractor has had to conduct 2 repairs for refrigerant leaks.  The first was in a pipe joint, the second required replacement of the forced air heat exchanger.  Upon shutdown, the unit emits a loud noise which sounds to me like hydraulic hammer.  I'm afraid this is actually the root cause of my 2 repairs and will result in future refrigerant system compromises.  Is this loud shutdown cycle normal for a Waterfurnace Synergy???

I had a very similar issue with my system. When the system turned off, the PVC pipes would shake making a loud bang sound. The issue was the water value was shutting off too quickly, a replacement slow shutoff value solve this issue. Is the noise coming from inside the unit or from the pipes?

Maybe a "water hammer arrestor" is needed.

open or closed loop?

Posted By joe.ami on 06 Apr 2011 10:14 PM
open or closed loop?

Not sure if you asking me or the OP, but mine is closed loop.

op