The rooftop package unit is composed of refrigerant
piping either in single circuit or multiple circuits. A single circuit system
is made up of one compressor, one condenser, one evaporator circuit, and one
metering device. This means that the refrigerant piping of a rooftop package
unit which do not contain refrigerant lines is field installed.
Therefore the correct answer is:
“No refrigerant lines are field installed”
