Knocking... Sometimes...

Javelin

Heating Pros,



Back in October, had a new Triangle Tube Prestige put in and it's great, but recently (since it has actually become colder out) not sure if it matters, I get a pretty regular knocking. Also installed a TT indirect tank, and the odd thing is that if I manually put on the DHW pump, the knocking goes away.. otherwise when the DHW pump it off, the knocking/rattling is there and is enough that it travels throughout the pipes throughout the house.



I've bled all the radiators - no more air coming out, and the system has (what I think to be) a properly installed spirovent that should eliminate any air bubbles I would think. Just odd that it only is silent when the DHW pump is ON, and like I said, wasn't a problem a month ago.



Does anyone have any thoughts? All the radiators DO seem to be getting plenty hot as needed and the house is toasty - just a bit noise. I've attached a couple pictures of the setup and a video with the noise is available at:



<a href="https://www.icloud.com/photostream/#A25oqs3qorqf9">https://www.icloud.com/photostream/#A25oqs3qorqf9</a>

RobG

Check valve

It sounds like the check valve is chattering. It is a swing check and should be a spring check. You are also missing a spring check on the boiler return line. Call you installer and have him fix those check valves and you should be okay.

Rob

Javelin

Thanks!

Thank you Rob G! I'll replace the "swing" with a "spring". The system does have a check valve on the return already, but it's just out of the photo to the left.



Thanks again,



Jay

Steve Whitbeck

check valve

There needs to be a check valve on the boiler loop going to the house system and one on the loo going to the indirect water heater.