whistling sound

paul_21

I have a hydro-therm gas fired hot water boiler with 3 zones.

when my main floor calls for heat and my basement zone is open but not calling for heat I get a whistling sound. If I shut the basement zone down(closing the ball valve) or if I open the zone valve completly or call for heat the whistle stops.

If my second floor calls for heat I do not have this problem. If the basement zone calls for heat and my main floor does not I do not get this sound.

Has anyone ever heard of this problem before?

I've swaped out two zone valves and changed the circulator pump and have bled the sysystem several times.

Has anyone ever heard of this before?

Paul

Andrew_16

Depending on the water quality you may have built up some scale in the boiler (if this is where the sound is coming from?). It could be that the flow to the one zone is a little low and that is why it causes it only on that zone and not on any other combination. I am not there to hear where the sound is coming from out the exact type of noise or the other components that are installed but a good 8 in 1 boiler treatment could be worth a try and would only help your system. In worse case could need a TSP system flush.

In my experience the only humming/squealing sounds are from this (minus maybe a bad pump or chattering check).

Guy Woollard

flow

If I am readinfg this correctly, it sounds as if you only get this noise when the basement zone is open, but not calling on it's own. With that, I would say that the zone valve is opening fully on a call, but only partially on manual, thus creating an orifice (and a whistle).

Guy Woollard
N.E. Regional Sales Mgr
Triangle Tube Corp.

paul_21

The valve is set for auto.

One thing i just found out from reading on this site is this:
I have a monoflow system(which I knew before) but what I didn't know was that when you remove a radiator from the line you can"t just put ends on the tee. you need to remove the tee completly or cuonnect a small piece of copper so you don't screw up the flow or pressure.

The first tee on the line was for my third floor. I capped that tee off and ran a loop system to the upstairs. The return goes to the down pipe near the circulator pump>

I have a similar set up my basement.

The basement was set up about 10 years ago and I never had the sound.

About 5 years ago I refinished my upstairs and ran new baseboard all the way around(I'm in a cape). The whistle started after that. Could capping off the first radiator in the run caused the whistling??

I get heat on all 3 floors w/o a problem.

Paul

Big Ed_3

Hydronic Noise

You have too muh flow through too smaii pipes or too long of a loop . You have two choices to correct the problem . Try using a Grunfoss circulator which has the lowest flow rate or add a system bypass . I would go right for the bypass.....

Unknown

paul

in your own words: About 5 years ago I refinished my upstairs and ran new baseboard all the way around(I'm in a cape). The whistle started after that. Could capping off the first radiator in the run caused the whistling??,,,sounds like you just answered your own question.

Dave