SOURCE: installing a honeywell CM900 wireless programmable thermostat
the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.
SOURCE: Installing Honeywell RTH7000 - I have too many wires!
check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats
SOURCE: how does transformer hook up
if you just replace the unit and it is working, no your do not need the tranformer. The unit is getting power from the furnace. For reference though. The black and white wires are your 120 volts. Black hot, white common. the 2 screws are your 24 volts
SOURCE: Honeywell T8411R 1028No power to the thermostat; breakers are not
site shows this thermostat is a non programmable unit and has been discontinued. none of the info sheets including a pdf shows a replacement battery. this thermostat operates off line voltage only. check for a control fuse or breaker on your heating unit.
SOURCE: I have a new York hybrid heat pump/gas furance
Did they check the sensor in the plenum. You are suppose to have bonnet sensor to switch from heat heat pump to gas whaen it is to cold for the heat pump. The bonnet sensor may be to bad. The unit is cycling ever five minutes because it may have five minute time delay.
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