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[mlappin]

Need to know if the AC needs both the Y and G wire, there is a way around that as well with the use of an aqua stat and a 24 volt fan relay or two.

[schoppy]

Mlappin that is how I have mine set up but I only use one T-stat. My surface sensing aqua stat opens the circuit to my Geothermal compressor when the water temp is above 130. I have a variable speed ECM motor on my high efficiency LP furnace which is my air handler for my Geothermal and second backup heat source as well. Works very well. 

[shepherd boy]

I have not got a pic from Bluegrass of the circuit board but I'll assume that this is a single compressor system.If duel compressor there is a Y2 terminal to deal with.  In the south I have seen installers struggle with these heat pump systems and would like this discussed. Here is how I would do it:   Use a 90-340 relay. Let the second stat power the relay and power terminal #3and #6. terminal #4 put a green wire jumper to G on board. original green wire goes to #5 which creates a normal closed circuit. When it trips will power the G.   #1 terminal gets a jumper to the Y on board. Original stat yellow and yellow from compressor go to #2 terminal.This is also the normally closed circuit. When the second T- stat it powers G and Y fan goes to 100%. Should the original want to back up the wood stat it can at any time as the yellow from the original stat is still connected to the compressor yellow. The fan is already on high. This hookup only takes a 90-340 relay.

We have done a bunch of these and they seem to work good, but there may be something better.

If you are using the Y2 or YO  on the board  a Different setup is needed.

 

[Bluegrass Wood Burner]

I will get my son in laws father to tackle this when he is over this way. All this is way above my head. I sure appreciate all your help on this. I'll update when we do it.