Manual for Refrigeration Servicing Technicians - UNEP - Division of ...

3
Refrigerant Management
CHAPITRE 3
PAGE 10
Recovery methods
Since a recovery unit will remove more refrigerant from a system than
any other practicable method, its use should be regarded as the norm and
not the exception. Recovery units are being more widely used due to their
increasing availability. It is important to use appropriate equipment
considering the characteristics of the refrigeration or air conditioning
system and the technical specifications of the recovery unit
regarding mainly capacity of the unit, rate of recovery, and type of
refrigerant that can be recovered. As with vacuum pumps, recovery
Condenser
Filters
Oil Separator
Receiver
Compressor
Accumulator
units will work much more efficiently if connection hoses are kept as
short and as large in diameter as possible. However, not being able
to get a recovery unit close to a system is not an acceptable excuse
for not using one. If long hoses have to be used, all that will happen
is that recovery will take longer. There is no longer any acceptable
reason or excuse for releasing refrigerants into the atmosphere.
These images show a typical configuration and the main components of a
recovery unit.
High-Pressure
Cuto�
Coaxial Coil
68
Configuration and
the main components
of a recovery unit