This seems like what I need. My condo was built in 1970. I need to replace my 40+ year old T651A 1152's. From what I can gather, I need the T651A3018's. I'm confused though, because the pictures of thes new units show 3 wires (Red Black and Blue) but I only have two wires coming out of my electrical boxes (black and white). A contractor removed and discarded my old thermostats by mistake (4 out of the 5 I had) so I need 4 new ones! I can connect these two 120Volt wires together to manually run my fan coil units (2 coil system where the building switches water from hot to cold winter/summer). So I'm wondering how to I wire this unit? I've looked at the Honeywell Instruction manual and don't see anything for this application Can anyone provide the answer? What wire goes to Black, what wire goes to white and what do I do with the third wire on the T651A3018? Do I jump it? Please help!

Hi
If u not a licenced contractor I will suggest to work with a professional/contractor but if u are a contractor then u can call honeywell contractors helpline-1800-468-1502 option 2 for contractors.
## the contractor helpline will only talk to the contractors and will ask for the licence num.