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I have a coleman evcon t-stat that is using 7 wires. I want to switch to a honeywell th3110d non-programmable t-stat but don't know where the wires should go.

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  • Lorraine Newman
    Lorraine Newman Nov 25, 2008

    I have a EVCON 7 wire thermostat that I would like to replace with a Hunter

    programmable thermostat, but most of the wiring is different. Should I replace the wiring in its entirety from the unit to the t-stat or?

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  • 57 Answers

The most common wiring is: This sometimes varies as to installers preferance.
Red wire is your supply power to the T-stat. R terminal
Green wire is the blower fan. G terminal
Yellow wire is compressor contactor Y terminal
older units used a blue wire to Y
White wire is heat auxilary or black wire W terminal
Orange wire is reversing valve O terminal
Blue wire is the common C terminal
Black wire can be emergency heat E terminal
Best thing to do is replace wire for wire from t-stat to t-stat
or write down the colors to which terminal on the old t-stat and match to the new. make sure you SECURE POWER to the Air Handler, furnace and condenser before replacing any t-stat.
It is very easy to short the wires out if the power is left on and take out your A/H low voltage fuse or transformer.

Posted on May 18, 2008

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Posted on Jan 02, 2017

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