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Posted by Jack, CVMS on December 17, 2003 at 11:06:34:
In Reply to: Zone Valve posted by Alfred on December 17, 2003 at 06:01:29:
Bear in mind that my response is a guess, based on an assumption from what you have posted. Your plumber is the man on the scene, and has first hand knowledge of the situation.
It sounds as though the thermostat in its present location is being satisfied before the family room is fully heated. That could be because the other zones are shorter, and most of the hot water flows through them. Most of the time balance valves (simply adjustable flow restriction) on the other zones can alleviate that problem.
My guess is that your plumber believes that by having the family room on its own zone will insure that that zone continues to get heat after the living room is up to temperature. This solution should also work. It will also have the advantage of providing the family room zone with the full output of the boiler whenever the other zones are closed.