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[hondaracer2oo4]

I am interested in putting an ECM motor in to replace my Psc motor. I would like to utilize a continuous fan option to keep the house at a nice even temp. I was wondering if anyone had any expierence using the continuous fan option with a Water to air hx. The evergreen Im motor goes down to 600 Cfm in low which seems like it would be to fast. I think at that speed it would heat the house above the set point. The evergreen oem motor goes down to 200 and that seems like it would work well but those motors are over $500. I would really like it make the house have less up and down temps. Any suggestions?

[mlappin]

You can get a thermostat that has a 1/2 degree differential, not sure that would help thou.

Mine is set at 1 degree differential, I've moved it as well as where it was at always stays warmer than the rest of the house anyways.

[hondaracer2oo4]

What I have noticed is that once in a while when the boiler runs out of wood and the temp from the boiler drops down to 120 or so and the fan has to run continuously with the low water temp that even though the house has dropped down to 66 or 67 degrees from the standard 70 degrees that the house actually feels more comfortable then when it is at 70 and cycling hot air up and down. I would really like to have the fan run continuous at a low rpm to slowly move the warm air and ramp up to high speed if the temp drops below the set point.

[mlappin]

I'm sure somebody else will have a better ideal, but if you can't find a fan motor that would work, maybe a zoning valve of some sort to control water flow thru the HX that had more than a simple open/closed.

[slimjim]

Perhaps a mixing valve, I would bet with a search, one could be found that ramps up or down according to temp.

[hondaracer2oo4]

Slim, I would have thought so too but it is proving much more difficult than I would have thought. I have found a few products. First is the http://www.fanhandler.com/ which is a ECM motor retrofit. The company wont sell it to me though, only through distributors and they don't have any in New England. I tried to go direct through them but they wouldn't do it. Also http://www.icmcontrols.com/Comfort-Control-Center-field-programmable-motor-speed-controller-115-VAC-model-Prodview.html but I haven't yet figured out how this works with a psc blower. It appears though that it is meant for A/C systems to control humidity but also talks about heat pumps and efficiency increases in them. I can't seem to find any other products out there.

[mlappin]

One thing that came to mind, if you have any balance problems with your duct work it will become very evident once you slow the fan down a bunch.

[hondaracer2oo4]

Im sure that I do have balance issues since I have never had anyone balance the cfm outputs. I have though shunted more air to the colder areas of the house, almost completely shut down the upstairs and closed the vent closest to the thermostat. These things have seemed to help make for a much more even temperature throughout the home.