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Electronics / Re: SOLVED !!!! FIXED!Help GOING CRAZY!!! One thermostat to control two heat sources

« on: October 01, 2012, 12:32:45 PM »

Problem SOLVED]Well Ridgekid - the Filtrete 30 50 does the trick!!  It will work for almost any configuration I can think of using one of our wood boilers.  The key is the differential setting that is configurable on the 30 50 between two heat sources.  The honeywells wait like 4 min then kick the secondary heat source in to play, not what we want.  I was able to set a 10 degree delta between the boiler and my natural gas furnace burner coming on.  It works like a charm!!! And the darn thing is wireless with applications to mange it remotely!!!!  Here is how its wired for my configuration:

C - common hot to run the Wi-Fi
G - Open
Y - Yellow
W - Green (fan)
R- Red
W2 - White

So when Heat is called for just my forced air fan comes on (W), if the boiler is out of wood or the pump dies and the thermostat sees a 10 degree temperature drop the secondary (w2) comes on.  I may shorten the delta so the house doesn't get so cold if there is a problem, but right now I just do not want to use any natural gas!! The free software even has detailed logging to dial you system in.. an example below.  Thanks for all that provided input - I appreciate it.  If you have any questions, 'll do my best to help you out but this thermostat does the trick!!

Hey, sorry to resurrect a dead thread, but I just picked up the Filtrete 3M-50 last night.  I can't seem to set the DIFF above 4.5 ... I was just wondering how you achieved 10 degrees of differential?  I plan to have my setback during the day be 8-10 degrees, so unless I can figure this out, I'll probably have to bring it back 

If I can't get it working, I'm just going to mount a snap disc thermal switch on my PEX and have it redirect the heat request signal between the 'heat' pin and the 'fan' pin at the furnace.  I'm already planning on using a snap disc thermal switch to run the furnace fan continuously if the water time ever drops below ~45 or so (to prevent freezing), so it would be minimal extra effort.  I just liked the idea of being able to see if the boiler is working from the thermostat's screen...