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RTH221B wiring with only yellow and green wires

Asked Dec 28, 2008, 06:50 PM — 1 Answer
I have an old Honeywell thermostat (rotary type). There are two wires, what seems to be green and maybe offwhite/yellow. They're coming off a late 1940s gas furnace with fan blower. I wired the yellow and green wires to the yellow and green terminals and the furnace and fan came on and never shut off. I had to disassemble the unit to shut it off.

Is there another wiring possibility? I programmed the unit before I stuck it on the mounted base, could that have done anything?

This is my Mom's home in north Jersey, so there's no AC.

Thanks for any help!

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hvac1000 Posts: 14,539, Reputation: 2381
Heating & Air Conditioning Expert
  
#2

Dec 28, 2008, 08:51 PM
Use W and RH for the terminals. It does not make a difference which wire goes where since there are only 2 wires.

See wiring 2.3 first picture right side

http://customer.honeywell.com/techli...69-2060EFS.pdf
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