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I'm hooking up the wires to a gas furnace, i have the 4 wires from the thermostat , two wires to the condensing unit of the a/c, two wires for the fan relay ,a wire from the gas valve, and a wire from the limit switch. they go on a board attached to the transformer. The screws on the board are marked r,c, w, g, and y. what wires go to which screws to make the furance run correctly

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Hi,

R -This terminal is the power for the thermostat. This comes from the transformer

C- Common side of transformer

W - This is the thermostat terminal for heating. This wire should go directly to the heating source

G - This is the thermostat terminal used for the fan relay to energize the indoor blower fan

Y - This is the terminal for cooling or air conditioning and goes to the compressor relay



Thank You

Posted on Oct 11, 2010

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