Help for replacing, upgrading, you old 2 3 4 5 6 7 8 wire thermostat
For all of you out there who are replacing your millivolt, 120 V
volt, 24 volt, (using different words and terms here to allow search
engines to find this post) thermostat, programmable or not for you
heat, furnace, AC, air conditioning, conditioner and are having
trouble, problem, problems, difficulty re-wiring, wiring, wire
identification, identify, reference, referencing power ground heat
cool heating cooling fan auto on control controls.
I had a problem replacing my carrier digital millivolt with a hunter
programmable. My old system had five wires and the hunter
instructions didn't tell me how to instal the thing. It referred to
RC and RH wires. Mine weren't marked that way. Mine had a C
connection. the Hunter didn't I searched the internet for a solution
to my dilemma. Some wise ass in response to a similar request by
another poor guy like me posted a response of "send me $50.00 and I
tell you how.
Finally I found that the Honeywell site: www.honeywell.com has a
thermostat wizard. The only problem with the honeywell site is that
it's set up for honeywell thermostats, BUT, if you bring up the "help
me buy" thermostat, you will probable find a honeywell that is almost
the same as the one you have. Mine was just like the CT3200. I'll bet
honeywell makes most of the aftermarket thermostats. Then you can use
the thermostat wiring wizard. Here you get to plug in the color (and
or description) of the wires you have to your old thermostat and the
wizard will tell you how to wire the new one.
The wizard told me how to hook up four of my five wires, tape off the
C wire, and jumper the RC to the RH. Ten minutes later my new
thermostat was in place and working fine.