Honeywell Thermostat Wiring Diagram 8 Wire

Honeywell thermostat wiring diagram rth2300b Can't figure this 3 wire system out or find anything in postal about it Thermostat wiring wire heat color diagram air pump nest guide common goodman colors honeywell code heater aruf handler wires labels

Can't figure this 3 wire system out or find anything in postal about it

Honeywell thermostat programmable wires installing inspectapedia rth3100c heating labeled terminals thermostats

Honeywell Thermostat Wiring Diagram Rth2300b - Wiring Diagram

Can't figure this 3 wire system out or find anything in postal about it