I have a Q674L 1132 that I'm trying to replace with a Honeywell RTH7400. The original T-stat only has 5 wires.
For the life of me I cannot figure out how that would translate over to the RTH7400. I've looked at the wireing layouts in the manual 100 times now and I am just not sure where the wires should go, and I certainly don't want to "guess".
Anyone able to shed any light on this one?