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Nesgroup address: misc.consumers.house - Date & Time for the message: Mon, 06 Jun 2005 17:09:35 GMT /

Author of the message: vze8f3tq@verizon.net (v)

Title of the message:
Heating Zone Going On "By Itself"???

Text of the message:
What would make a zone (of a multi-zone hydronic heating system) heat
up when not needed?  For a while it was the "Upstairs" zone, now it is
the "1st Floor North" zone (there are 4 heating zones and 2 indirect
fired heat exchanger domestic hot water "zones").
This doesn't happen all the time, but repeatedly happens
intermittantly.  Like the other night I was sitting in the "den" when
I noticed that the radiators were hot.  The room temps at all times
were WAY above set point.
We have simple mechanical thermostats, the kind with the mercury
bubble in the clear capsule. It can be visually verified that the
bubble is NOT in the "ON" position.
Why would the system be doing this?  As it now is intermittant and
short lived I have not verified either way that the circulator pump
comes on or not - is it possible to develop a convection loop even
through the circulator pump; what if the check valve is hung up, would



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