Wiring a Noma Thermostat

burnerman_2

if an i asume u r a homeowner this is y the severice companys charge a fee if u wire it up wrong u can burn up a relay check and see some have a jumper wire between the rcand rh c 4 coolin and h 4 heating if that was the case the new one may just have seperate terminals and as said (g fan)( r rh 4 heat)( w to w)( blue to rc 4 cooling )(and y to yellow 4 ac condencer) but be sure u turn off power these r only 24 vop;t but still some new furn have a fuse 4 low voltage then u will have other problems royboy

RJ_6

I tried to install a programmable thermostat but I forgot to mark the wires when I disconnected the old thermostat. The air conditioner works fine, but the heating doesn't work. Find below the present hook up. Can someone help me out?
At the furnace I have:
R- Red wire
W - nothing is hooked up to this
C - Black wire
Y - White and Yellow wire
G - Green wire

At my thermostat I have:
G - Green wire
R - Red wire
Y - Yellow wire
W - White wire
and I have a black wire that is not hooked to anything. I believe the black and white are the power lines.

Can anybody help me out on this one?
R

bruce_21

The R is the hot. Y is the cooling condenser. G controls the fan. C is the common and only used at the stat to power it if there are no batteries, so it is OK if there is no C terminal on the stat. Usually W is the heating control. Did you mess with the wires at the furnace at all? I'm surprised that the white wire is not connected to the W terminal there instead of being connected with the yellow at the Y terminal. If you only took off the old stat and didn't touch anything else look for some other device or junction in this wiring to explain why the unit worked before and not now.

Dave_4

program

What are the setting C1 C2 C3 C4 for