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View Full Version : Wire a honeywell thermostate RTH221B


artown
May 13, 2008, 01:59 PM
I am trying to wire this into an RV My wire are 7.5 V-red, cool Yellow, Fur White, Fan Blue, Ground Green Where do these go on the honeywell.
Thanks
Allen

hvac1000
May 13, 2008, 04:30 PM
It is a 24 volt thermostat. Take that project off your to do list because it will not work on 7.5 volts.