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Curious Radiant Heating Problem expsite 08-26-2006
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Posted by on August 26, 2006, 10:25 pm
Working on a previously healthy 4 port manifold radiant system. The
thermostatic part of the system seems to be working... the pump
(Grundfos UP 15-42F) & boiler (shows 140) come on & the motoroized
actuators
respond correctly.

The mystery is that only 2 zones (closest to the boiler input end of
the manifold) get flow (both input & return tubes heat up)... even when
manual depressing the
actuator valve, there is no discernable heat in either of the other 2
tubes. The
manifold & actuators were new 6 months ago and it is reported that
everything worked fine, until recently.

What could have happened that would cause these 2 zones to not flow????

Any thoughts greatly appreciated.


jr


Posted by Dido on August 27, 2006, 10:28 am
System is not balance properly or zone valves do not work
or perhaps you have air the system and you not getting full
circulation "which is most likely"
DIDO

> Working on a previously healthy 4 port manifold radiant system. The
> thermostatic part of the system seems to be working... the pump
> (Grundfos UP 15-42F) & boiler (shows 140) come on & the motoroized
> actuators
> respond correctly.
>
> The mystery is that only 2 zones (closest to the boiler input end of
> the manifold) get flow (both input & return tubes heat up)... even when
> manual depressing the
> actuator valve, there is no discernable heat in either of the other 2
> tubes. The
> manifold & actuators were new 6 months ago and it is reported that
> everything worked fine, until recently.
>
> What could have happened that would cause these 2 zones to not flow????
>
> Any thoughts greatly appreciated.
>
>
> jr
>



Posted by Steve Scott on August 27, 2006, 11:11 am
What happens when you close all of the zones except one of the zones
w/o flow?

Did you try purging the zones that aren't flowing?

On 26 Aug 2006 19:25:46 -0700, expsite@yahoo.com wrote:

>Working on a previously healthy 4 port manifold radiant system. The
>thermostatic part of the system seems to be working... the pump
>(Grundfos UP 15-42F) & boiler (shows 140) come on & the motoroized
>actuators
>respond correctly.
>
>The mystery is that only 2 zones (closest to the boiler input end of
>the manifold) get flow (both input & return tubes heat up)... even when
>manual depressing the
>actuator valve, there is no discernable heat in either of the other 2
>tubes. The
>manifold & actuators were new 6 months ago and it is reported that
>everything worked fine, until recently.
>
>What could have happened that would cause these 2 zones to not flow????
>
>Any thoughts greatly appreciated.
>
>
>jr


--
All things come to him who waits... As
long as he works like hell while he waits.





Posted by on August 31, 2006, 10:14 pm
Thanks for all the responses... the culprit here was a huge amount of
calcium buildup and corrision... the two bad loop's manifold valves
were completely eaten apart, that is, the shaft was no long connected
to the closing seal... so, up or down, nothing was happening as far as
opening or closing the circuit. Should have checked that earlier, but
this was a new manifold installed just 8 months ago.

That solved, the question remains as to why so very much corrosion in
such a short period of time...????


Posted by Noon-Air on August 31, 2006, 11:22 pm

> Thanks for all the responses... the culprit here was a huge amount of
> calcium buildup and corrision... the two bad loop's manifold valves
> were completely eaten apart, that is, the shaft was no long connected
> to the closing seal... so, up or down, nothing was happening as far as
> opening or closing the circuit. Should have checked that earlier, but
> this was a new manifold installed just 8 months ago.
>
> That solved, the question remains as to why so very much corrosion in
> such a short period of time...????
>
Dissimilar metals. Easily corrected with proper water treatment, and
sacrificial anodes.



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