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    newideas Posts: 1, Reputation: 1
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    Oct 2, 2012, 08:48 AM
    How to add a fan switch in my HVAC system in the basement.
    Hi,

    I just bought one of those new programmable thermostats. The old one did not have a C-terminal in the thermostat or the wires to the thermostat.

    MY HVAC system has Y, R, W, G, C wires in the terminal block. On the new thermostat, and on the HVAC system, I'm connecting the G line to C to power the system. So far so good.

    The G line is for the Fan. With the connection above, I lose control of when I decide to run the fan.

    I think I can add a manual switch in the hvac to manually turn on the fan if I want to circulate the air in the house. My question is, how do I do this? Which terminals in the terminal block can I wire to a switch to turn it on whenever I choose to?

    Thanks for your help.

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