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Let me see if I can find a manual on your old thermostat.B on many older thermostats was Common. Not so on the 2300.
Do you have mode lon old stat available?
What is model on old tstat?
I am looking for a manual .Did the old stat have those named terminals RYBG
I a not finding any manual on this.I am going to open to other experts who may be more familiar with the Whalen brand.