FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Commissioning
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 81
8.2.6 Initial charge for refrigerant circuits
The recommended procedure requires a triple evacuation, whilst adding any addition
oil before adding the initial charge. It is as follows:
Initial evacuation
•
Connect the service manifolds to the Multi -DENCO system in an appropriate and
safe manner.
•
Make sure that all system valves are open (i.e. shut off valves)
•
If the system contains Oxygen-Free Nitrogen (OFN), carefully purge the gas to
atmosphere in accordance with safe working practices
•
Connect the vacuum pump to the service manifolds
•
Achieve a vacuum of at least two Torr (2.6 mBar)
Adding oil
If the interconnecting pipe length (one-way) is greater than 20 metres, it is likely that
more oil would be required for the system. Your local representative can advise on the
amount of oil required (if supplied with the required information).
•
Add the required oil to the system (under vacuum) via the discharge line.
NOTE!
It is recommended a triple evacuation is thoroughly conducted. If the system cannot
be evacuated to the levels defined below, you must NOT add any refrigerant and
the system installation must be checked and corrected. Once completed, re-con-
duct the procedure and ensure requirements are achieved. Incorrect or inadequate
evacuation resulting in moisture or contamination within the system will void war-
ranty.
NOTE!
No refrigerant commissioning can commence until the commissioning engineer has
reviewed the 'Pressure Test Certificate' (chapter 13.1) and ascertained what gas
and pressure the system is at.
NOTE!
Any work on the refrigerant system must only be carried out by suitably trained and
qualified personnel. Refer to local and national regulations and guidelines.
NOTICE
Excessive oil added to a stationary compressor may cause a hydraulic lock and
damage the unit during start up. This will void warranty.
•
During evacuation, oil must be added into the discharge line.
Non-return valves are installed in the compressor discharge line to prevent
the oil travelling against the flow direction (into the compressor).