2
4.4.3.
System drain
For the refrigerating machine and the compressors to work properly, it is essential to correctly vacuum the
system to ensure a value of air and above all of humidity below the permissible values.
Introduction of the new gases required the use of polyester-based oils with characteristics of high
hygroscopicity, necessitating greater attention in creating of the vacuum.
The duration of the draining phase is variable as it depends on several factors, but must nevertheless be at
least 24 hours. In addition to reaching a vacuum level of at least 0.3 mbar it must remain constant over time.
The IND1 indicator of liquid passage must be green to indicate the absence of humidity.
ATTENTION: Before proceeding with the drain phase, check that all the valves on the machine and
on the system are open.
ATTENTION: The drain phase can take place when the machine is not electrically powered.
ATTENTION: Any removal of coils from solenoid valves must take place when the machine is
switched off. Only perform ignition after repositioning the coil on the solenoid valve.
ATTENTION: Do not start the compressors in vacuum conditions and without gas loaded, to avoid
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