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Posted by RayV on February 28, 2007, 12:35 pm
> I have an eichler with the heat in the floor. When the furnace was
> replaced, I had 2 zones plumbed, one for the main house, and one for a
> part of the house that didn't have heat installed.
>
> I plumbed the second zone, using Slant/Fin, hooked it up, turned it
> on, and poof! the heat works just fine. Until the first zone comes
> on, then the second zone gets nothing. I'm not sure, but I think the
> first zone even pulls cold water backwards through the second one,
> because the second zone pipe turns cold quite quickly.
>
> When the furnace was installed, both zones were run individually by
> separate pumps of the same size. No zone valves were used. But that
> pump wasn't strong enough to pump through the eichler floor, so the
> heating guys put in a bigger pump. The second zone has a smaller pump
> that works quite well when the first zone's not on.
>
> I tried balancing the heat by adjusting the flow valves for the first
> zone. This works, the second zone gets heat, but I can tell the
> furnace is not working very hard, and the house doesn't come up to
> temp anymore.
>
> I thought about hooking the zones up so only one can run at a time,
> but this won't work because the second zone is so small that it only
> drops the water temp by 10 or so degrees, and the furnace doesn't run
> until the water temp drops by 15 degrees, so the house is cold, and
> the furnace is not running.
>
> Any ideas? I'm having the heating contractor come back and look at it
> next week but would appreciate any feedback.
>
> Thanks
>
> Rock
IIWM I would have one pump and two zone valves. No reason to have two
pumps unless the big pump for zone 1 pushes too fast or hard for zone
2.
Don't go for flo-control or check valves because they have to be set
up very carefully to work properly.
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