What does each digit represent in the model number of a trane heat pump?
Base unit model, design sequence, nominal capacity, voltage,
phase, compressor type, refrigerant type, option1, option2 etc.
etc. These are basic values included in all unit model #`s and are
not in any order. For the proper nomenclature to interpret Trane
model#`s look inside page 1 or 2 of your owners manual or try going
to Trane online.