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-   -   Replacing thermostat wiring. (http://www.diychatroom.com/f17/replacing-thermostat-wiring-153334/)

CFR 08-11-2012 01:15 PM

Replacing thermostat wiring.
 
I have a 2H/1C Honeywell T8411R, that I want to replace with the programmable thermostat. My current wiring is as follows:
Orange = O
Blue = C
Green = G
Yellow = Y
White = W2
Red = R
Black is not connected.
Brown is not connected.
Nothing is connected to L.
Nothing is connected to W1.
Nothing is connected to E.
Nothing is connected to B.
W1 and Y are linked.
The programmable thermostat has the following options:
E,Aux,,Y,G,O,L,R,B,C.
How do my existing wires connect to new thermostat.

turnermech 08-11-2012 01:37 PM

first thing is turn off power to the indoor unit or you run the risk of shorting the transformer.

E=for emergency heat can be connected to that but will be fine if left with nothing. tstat will use 2nd stage contacts to engergize aux when placed in emergency heat. for a homeowner I would not recomend making changes to use it or jumping to Aux terminal. only down side to not using it is if unit is placed in emergency heat set point will be 1 degree below act temp.
Aux=white
Y=yellow
G=green
O=orange
L=nothing
R=red
B=nothing
C=blue

CFR 08-11-2012 03:09 PM

Thanks for the quick reply. I am a little confused, it sounds like the Em Heat function was not even functional on my old tstat? Would it be better to use a 1H/1C tstat with W,Y,G,O,Rc,R,B,C, since there is nothing hooked up to E on my old tstat.

turnermech 08-11-2012 03:31 PM

no by your wiring i would guess you have a heat pump with electric (or some other) back up heat. E termianal or emergency heat is quite offen not hooked up. It is better to hook it up not required. Without it the only thing is if you ever need to use the emergency heat function (does not happen often typically when your outside unit had a problem) the tstat will only be able to energize the electric heat by the second stage of the tstat. Really not that big of a deal. Easy to fix but depending on you level of knowledge not required. you do need the 2 heat 1 cool stat you have

CFR 08-11-2012 04:08 PM

Thanks for the confirmation. I have not used Em Heat in 5 years that I have been in the house, so I will not worry about it and use your wiring recommendation. Thanks again.


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