• The system needs to be operated down to its design evaporating temperature before you
can be sure the charge is correct. It is at this point that the normal refrigeration operational
checks can be carried out-such as checking the liquid line sight-glass for violent bubbles
and the operating pressures.
• In the event that the system is still short of refrigerant, repeat from the last 4 steps
onwards.
11.0 E2 Control and Operating Features
32
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