i think it is a single stage furnace, all wiring are the same. use R and W, no other wires needed if you have no aircon. connect C if you want thermostat uses AC power from furnace.
Comments:
Nov 20, 2009
- My previous replay is for danwood. PY9C is 2 stage varispd, yet I don't know how to upload.
I just replaced a thermostat on a york furnace model gy9s100c16up11h. During the process i connected the red and white wire and the unit came on after making the connections it will not come on even if I jump the red and white wires without the thermostat. Thanks
Dan
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