Re: Re: Hydronic system - pipes BANG when zone shuts down


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Posted by Dale Van Aken on January 06, 1998 at 18:55:36:

In Reply to: Re: Hydronic system - pipes BANG when zone shuts down posted by pillsbury on January 06, 1998 at 16:33:40:

:

: if it were me i would start by looking at what the hi/low limit setting was on your aquastat
: control. usually i will set them at hi (200) lo(180)
: with diff.(20). you may find that your settings are to high causing the boiler to over heat the water at the tail end of a cycle thus boiling the water making steam, causing a banging sound. i've seen this many times id start with this before i tore apart a zone valve. also, if your limits are set at 200/180 try setting them at 190/170 ive also seen times where the control overides the limit a little and a lower setting had to be used because they are not always 100% accurate. also you should contact the person who put your system in because you will only make his job harder if you mess with it!!. but if you do decide to tackle it yourself i think your problem is with the limit settings. not the zone valve

: pillsbury:

Thanks pillsbury for your ideas. I will look into this. The one thing that I should point out is that this noise occurs when the zone valve closes - always, and does not seem linked (time-wise) to the boiler cycle. Doesn't this suggest the zone valve?
Thanks again.

Dale




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