How do I place the wiring with 2 wires-- one black and one yellow?
hvac1000
Oct 30, 2007, 04:29 PM
R and W. for heat only
labman
Oct 30, 2007, 08:28 PM
More likely RH and W.
hvac1000
Oct 30, 2007, 11:03 PM
labman is probably correct. I usually end up tying the two R legs with a jumper because of the AC and same transformer. That tells you how long it has been since I wired up for heat only.