Need help with Venstar add a wire & Honeywell Wifi thermostat installation

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Old 06-19-14, 01:21 PM
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Need help with Venstar add a wire & Honeywell Wifi thermostat installation

Hi all. We are in the middle of installing the Venstar add a wire unit to our furnace along with a new Honeywell Wifi unit and are a bit stuck. The thermostat end is finished and fine. However, at the furnace end - our board/terminals are different than the venstar manuals and youtube tutorials so not sure exactly what goes to what. It's a brand new furnace so really need to make sure we don't mess anything up. It's the Honeywell Model # RTH8580WF if that matters.

I've attached 3 photos to show the existing wires/terminals etc - any suggestions would be great. Thanks so much.

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Old 06-19-14, 02:33 PM
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The board looks pretty standard.

Are the thermostat wires connected to the wires coming off the molex connector?
 
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Old 06-19-14, 02:54 PM
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I'm looking at the manual, and it's pretty straight forward. (I've installed one before too, so I'm not only relying on the manual)

Instructions:

1. Shut the power off
2. Disconnect the thermostat wire connected to G (they're marked on the board - follow each lead to see what's what)
3. Connect it to the blue wire on the "add a wire"
4. Disconnect the t-stat wiring leading to y (leave the other wire which lead to the a/c)
5. connect green from add a wire to wire leading to g, yellow wire from add a wire to y
6. brown from add a wire to wire leading to c (leave the other wire which lead to the a/c), and connect the wire that was leading to Y to C
7. red from add wire to wire leading to r (leave existing t-stat wire)
8. At t-stat, old yellow wire now goes to C, G gets split by the diode, green lead to g, yellow leads to y, the other wires are the same.

Be sure to not confuse the wires leading to the a/c (if you have it) with the wires leading to the t-stat. Also, if you wire it wrong, you can blow the transformer in the air handler or board ->make sure the connections match those in the manual.

3.
 
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Old 06-19-14, 05:43 PM
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Thanks for the replies all - about 30 mins after I posted we got a call back from Venstar and they walked us through it to confirm all was ok. Up and running!
 
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