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Posted by HeatPro on December 31, 2007 at 09:57:21:
In Reply to: Ivensys WA300 Controller posted by Derek on December 31, 2007 at 07:57:57:
IMO you are fortunate in that you have the 'next-best' system for heating that makes use of duct. An advantage of the boiler-heated coil in the duct is that an outdoor controller can vary the water temperature according to the weather, thus enabling you to run the fan at slow speed almost constantly in cold weather to prevent the cold cycles that people complain about with heat pumps and furnaces.
As duct systems are installed to get a cheap way to have cooling for a few months in the north with less comfortable heat for 8 months of the year, there is that problem of blowing air around in the winter to get heat without having the outer walls have something that is warmer than your body; but the WA controller enables you to add that feature of comfort. Also, as your boiler uses water to transfer heat, you have no worries about a burned furnace thin-metal heat exchanger suffocating you.
Your controller is already capable of handling some baseboard or radiant zones, so you are set to add the best heat where you want. It is about that simple to use the WA terminals for the baseboard zone circulator and leave the fan as is.