Honeywell RTH7400 - Manuel (Page 5)

3 69-2487EF—01
RTH7400/RTH7500 Series
Label the wires using the supplied wire labels as you
disconnect them.
3
Label Wires with Tags
Wire Labels
M28100
M28093
NOTE: Jumper wire used on old thermostat? If yes, note
what letters the jumper connected and review in wiring
section.