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View Full Version : Manual for wiring a honeywell thermostat model rth221b


Kdempster1219
Mar 25, 2013, 03:29 PM
I have a honeywell thermostat , model RTH221B. Can this be installed in a fifth wheel RV. My wires on the old one are air- blue, white, green, yellow. The heater has green, greenblack. The new one has a port connection for B,O,G,Y,W,R,RC. Please advise me how to connect the wires.

wmproop
Mar 26, 2013, 07:31 AM
The last camper I worked on worked on a 12 volt power system. (its been several years), I had to get a special 12 volt tstat,, a house tstat works on 24 to 27 volts,and couldn`t be used in camper

Kdempster1219
Mar 26, 2013, 10:37 AM
the last camper I worked on worked on a 12 volt power system. (its been several years),,I had to get a special 12 volt tstat,,,a house tstat works on 24 to 27 volts,and couldn`t be used in camper

Thanks for the information. I will get one from the RV store.