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RTH2300/RTH221 Thermostat Series - Honeywell Store
If labels do not match letters on the thermostat, check “Alternate Wiring” on page 6 and connect to terminal as shown here (see notes, below). Thermostat does not work on Heat Pumps with auxiliary/backup heat. W/ Aux Not Used M3271
Tag:honeywell rth221b wiring diagram
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