Print

[woodwalker2010]

Just got my owb fired up two weeks ago for the first time. Wanted to get the bugs worked out before cold weather. Right now I'm just heating domestic water. Smooth sailing. I will be heating my house with a water to air hx in my furnace. Furnace is a 2 zone Carrier gas furnace with a heat pump for AC. House is a two story house with one zone up and one zone downstairs. Each zone has it's own thermostat. On zone #1 downstairs I put a Honeywell non-programmable beside the existing t-stat and jumped from the "G" and "R" on existing t-stat to "W" and "R" on the new t-stat. Works perfect. Fan only will cut on when I set the new t-stat to call for heat. Now my problem.  I did the exact same thing upstairs on the other t-stat for zone #2 but it will not work. Am I missing something on this second zone? Not sure if I should have another wire somewhere for this second zone. Like I said it works great on zone #1. Both of the existing t-stats are wired the same. Should this other zone work just like the first or am I doing something wrong? Thanks guys.

[woodwalker2010]

After some investigating I found out why the #2 zone t-stat won't turn on the fan. With this Carrier Weather Maker the second zone will not control the fan only. This problem I can fix, but I discovered another problem I didn't realize I had. With this type setup the zone dampers are normally open when no heat or cool is called for. When one zone calls for either the other zone damper will close, sending the air to the zone calling for it. There lies my problem now. Is there any way to rig these t-stats so that I can control the zone dampers and just have the furnace fan come on. I can get by this by just using one t-stat to heat the hole house but it would be nice to have each zone work independently, as the temperature swing can vary quiet a bit from downstairs to upstairs. If anyone has any suggestions they would be very appreciated. I'm going to research some more and find out which wire controls the dampers. Thanks.

[slimjim]

What type of control is on the gas furnace?  there should be an end switch on that control that can be used to control the fan ( using anotherTaco 501 relay to power the blower only) when either zone calls for heat and the dampers remain the same. Interupt the power supply to the burner with a strap on aquastat placed on the incoming water line from the wood boiler, any time the wood boiler water is above setpoint the burner cannot fire and the blower comes on when there is a call for heat.