If the title wasn't confusing enough, this post might be
American Standard HP system with a propane gas back up 90+% furnace.
Honeywell Vision Pro 8000 3/heat 2/cool T-stat
I cannot for the life of me figure out how to get the Y1 signal to drop out if and when the back up heat is called for.
I was told that I could avoid the fossil fuel kit by using the VP8000 stat.
Any advice would help.