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Posted by AKS on December 1, 2006, 7:00 pm
Good for you
Dido
>I posted a few weeks ago about a problem my BIL had with his zoned hot
> water system. The system had a circulator pump on the inlet side of
> the boiler and a circulator pump for each of the 3 zones (4 pumps
> total). Following each of the circulator pumps was a flo-control valve
> (http://www.bellgossett.com/Press/BG-flocontrol.asp), there are no zone
> valves.
>
> The problem was the pump on the inlet side of the boiler would kick on
> whenever any zone called for heat. The pressure was enough to send hot
> water through each zone even if though there was only a call for heat
> from one zone. He told me it always worked this way and the upstairs
> was miserably hot.
>
> To me it seemed as though the 3 pumps and flo-control valves were a
> botched add-on to zone the house.
>
> I went over on Sunday and disconnected the pump on the inlet side of
> the boiler and ran each zone separately. The system worked fine, only
> got hot water in the zone that was calling, boiler reached temp and
> shut down then restarted when it cooled off again. I verified that
> each zone worked properly.
>
> I'm going to leave the pump in place for a few weeks just in case a
> problem comes up but everything seems OK. There is a little bit of hot
> water creeping up the return side of a non-calling zone but it
> shouldn't be a problem. The original threads can be read here if you
> are interested.
>
>
http://groups.google.com/group/alt.home.repair/browse_frm/thread/b8d58a986c5e6d7c/97dcc9bfaf976c9d?lnk=gst&q=&rnum=3#97dcc9bfaf976c9d
>
> http://groups.google.com/group/alt.hvac/browse_frm/thread/5e24450af54a2ac6
>
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