Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

2 Answers

Thermostat Wiring: W2? E? Where to connect?

I am replacing an old mechanical White-Rodgers thermostat with a digital 5-2 day programmable one from Honeywell (Model # 6300B). The wires I have coming out of the wall are connected to R, G, Y, O, W2, and E. Pretty self-explanatory: just match the wires to the new thermostat. But the new Honeywell thermostat doesn't have a W2 or E terminal.

Based on the diagram I have on the installation manual--
C or X, B wires, do not connect

G or F wires, connect to G
W or W1, H, O/B wires connect to W O/B
--unused terminal in between--
Y or Y1, M wires connect to Y
R or RH, 4, V connect to R
Rc or R connect to Rc

I have a fully electric system: 2-stage heat, single-stage cooling. Voltage at the thermostat is 24v

I want to think that W2 can just go to W and E stays disconnected. But before I do anything, I just want to make sure. Thanks for the help in advance

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  • sonikku10 Dec 15, 2008

    Sorry, forgot part of the model number--
    RTH6300B


  • sonikku10 Dec 15, 2008

    After doing a bit of reading, I thought I might give you the wire colors to the (old thermostat) terminals, too, just in case:

    R - red
    G - green
    Y- yellow
    O - blue
    W2 - white
    E - black


  • Anonymous Mar 31, 2014

    I have two wires. Very old not marked at all.

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You have a heat pump. You need a thermostat for "Heat pump with Electric back-up heat". Make sure the 'stat has either an "aux" (auxilliary heat) or an "E"(Emergency heat) terminal. The wiring instructions will be provided with the thermostat.

Posted on Dec 16, 2008

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R connects to RC/RH there should be a jumper between them , G connect to green , Y connect to Yellow , Blue wire to O/B , White wire to AUX , Black to E , and a jumper wire from AUX to E

Posted on Dec 15, 2008

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