Greg,
Your unit makes much more sense than the OP's with 3 switches. The 4th hot on yours accounts for the night light. Yours has to go through off to switch direction while his would jam the motor switching HEAT on & off with FAN on. Does the pilot on yours light dimly on FAN? I think yours would be more cost effective with 2, SPDT- Center off switches than my drawing with 3, SPDTs or 1 SPDT & 2 SPSTs. I just drew it to match the way he described it.
Joe
