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I am replacing an T8411R with RTHL3550 and I have the following wires (old=new): G=G R=R O=O Y=Y E=aux/E W2=?? C=?? I do not know what terminals to attach W2 and C to.

I am replacing an T8411R with RTHL3550 and I have the following wires (old=new): G=G R=R O=O Y=Y E=aux/E W2=?? C=?? I do not know what terminals to attach W2 and C to.

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  • 31 Answers

W2 should be an ac unit and the 'c' is your common wire.

Posted on Apr 23, 2013

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Posted on Jan 02, 2017

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SOURCE: Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat

Hello,You forgot to wire the O terminal w1 witch is the reversing valve.It is important to check if old stat is using O or B in witch case B terminal=w1 leaving O unused.

Posted on Apr 21, 2010

  • 5 Answers

SOURCE: i am installing a totaline progammable thermostat,

First off, make sure that the wires you are connecting at the thermostat match the circuit board of the unit. It is good practice, but not always followed to do a "1 for 1". To answer your question, W2 is simply when there is 2-stages of heating. If your furnace does not have 2-stage heating, then leave it empty on the t-stat. "C" is common. Common is neutral, so it should have continuity to the ground or L2. If your old stat did not utilize this, I wouldn't worry about it, unless the new stat is a touchscreen and constantly lit stat. Just keep this in mind. W-warm (heat), Y-cooling, G-fan, R-hot (main 24v power from furnace to thermostat), C-common (not always required), AUX (auxillary, if there wasn't one used on your last furnace, I wouldn't worry about it.). X may have been a common, or a dead terminal.
Bottom line, if you open your furnace to see the circuit board and where the thermostat wire connects, and match above, you should be just fine. Make sure you turn power off prior to opening the furnace, and when landing the wires on the stat. You could inadvertently blow the 24v transformer.

Posted on May 09, 2010

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C is actually a power wire; it provides power for some programmable thermostats. You don't have to connect it on the new thermostat; cover the end with electrical tape to avoid it causing a short. (If you keep that wire accessible, it will be nice for someone who wants to use another programmable thermostat. The ones which can talk to wireless networks require this wire.)

Do you have a heat pump? That is the only time a thermostat uses an E wire.

The W2 wire should go to AUX (third screw terminal from the left) and the E wire should go to E (second screw terminal from the left). See page 25 (27 on the pdf) of the Quick Installation manual for the RTHL3550. This manual is available from Honeywell at http://yourhome.honeywell.com/home/Products/Thermostats/Digital-Non-Programmable/RTHL3550D.htm .

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First off, make sure that the wires you are connecting at the thermostat match the circuit board of the unit. It is good practice, but not always followed to do a "1 for 1". To answer your question, W2 is simply when there is 2-stages of heating. If your furnace does not have 2-stage heating, then leave it empty on the t-stat. "C" is common. Common is neutral, so it should have continuity to the ground or L2. If your old stat did not utilize this, I wouldn't worry about it, unless the new stat is a touchscreen and constantly lit stat. Just keep this in mind. W-warm (heat), Y-cooling, G-fan, R-hot (main 24v power from furnace to thermostat), C-common (not always required), AUX (auxillary, if there wasn't one used on your last furnace, I wouldn't worry about it.). X may have been a common, or a dead terminal.
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