1. A method of monitoring an amount of refrigerant in a refrigerant system having an electric motor driven compressor, a condenser
and an evaporator;
determining a temperature difference between a saturation condensing temperature and a liquid refrigerant temperature of sub-cooled
refrigerant; and
automatically determining a variance between the determined temperature difference and a desired temperature difference, and
utilizing said variance to determine whether the amount of refrigerant in the refrigerant system is as desired.
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