Wiring new thermostat
#1
01-22-05, 12:37 PM
Wiring new thermostat
trying to wire a new honeywell thermostat we have the wires connected except for one it was on X1 on the old thermostat but on the new thermostat there is no intructions on where to put it there is only x and x2. Help please! 
#2
01-22-05, 01:17 PM
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Location: Mountain Williams Missouri
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Info info helps . What are you putting it on and what tstat is it. Just info ---- X most of the time is common and X2 is the emergency heat relay in my books. Id say find out where your X1 goes to are do at the unit.
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#3
01-22-05, 03:39 PM
It is a Honeywell RTH7400D. We have heater and air conditioner, we believe it is a heat pump, one unit in attic and one outside that runs when heat is on. The old thermostat had 7 wires; R, O, Y, G, X1, E, W2. New thermostat codes; R, O/B, Y, G, C, L, E, Aux. We connected old R to R, O to O/B, Y to Y, G to G, X1 to ?????, E to E and W2 to Aux. We did not connect anything to C or L. Manual possibilty X, B or C possible connection to new terminal C.
#5
01-22-05, 07:50 PM
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You didn't mention the color of the mystery X wire, but go to the airhandler and remove the cover and see where this wire lands. I'm guessing it's the common but don't hook it there on my guess.
