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Boiler Coil Zone Heat Problem

USA498
USA498 Member Posts: 45
I have an interesting thermodynamic problem with an installation I did (DIY'r). I have a 2nd floor porch that I renovated into a room and I was not up to the task of installing a radiator for the steam system. My boiler has a H/W coil which I zoned to a 12' of baseboard radiator. It all seemed like it would work except for this little problem.
When the main thermostat calls for steam the Zone system heats up as well. I am assuming that it is heating the water in the coil and the hot water is rising and the cool water is being pushed down. The circulator pump is NOT running. Any help to solve my heat rising issue would be greatly appreciated.

Many Thanks!
Peter
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