netdecal
Jan 4, 2012, 08:59 PM
I want to upgrade my thermostat to a Honeywell TH6220D
wmproop
Jan 5, 2012, 06:31 AM
Be sure to turn off power to furnace before you start
Also might be wise to tag each wire as you remove from each post of old tstat, so you have no confusion as to what color goes to what post of the new tstat