ClimaCool UGW Manual - Manual (Page 48)

www.climacoolcorp.com
46
Compressor Information
Model UGW utilizes a screw compressor . The compressor
is highly efficient and extremely reliable. The information
contained in this manual will be useful for care and
maintenance .
Compressor Rotation
All screw-type machines are unidirectional and will only
compress in one direction . Operating in the reverse rotation
will be destructive and will be indicated by a load operating
noise together with a lack of compression .
Compressor Lubrication
The compressor operates on a sealed system and oil can
only be lost if a leak occurs . There are few cases when oil
will need to be added to a machine in normal operation .
Oil Type
The oil in all screw compressors used in Model UGW is
polyol-ester type oil, (PVE), and is intended for R-134a
refrigerant use . All PVE refrigerant oils require special
handling and should be protected from contamination .
They are extremely hygroscopic and will absorb moisture
rapidly from the air . It is strongly recommended to store
and dispense PVE oils from sealed metal cans . Note: Refer
to compressor name plate for proper oil type. Different oils
cannot be mixed.
Oil Levels
The oil level in the compressor should be checked with the
compressor running . The compressor oil level may vary
during operation and particularly on the startup . The normal
operating compressor oil level should be between minimum
and maximum levels of the sight glass . During operation
a certain amount of oil is carried out into the refrigerant
system . The system has been designed to bring the oil back
to the compressor . If the level in the sight glass falls, it may
be due to the operating conditions and enough time should
be given to allow the oil to return before more oil is added .
The compressor should not be allowed to operate below the
minimum level of the sight glass .
Adding Oil
The compressor must never be ran in a vacuum . A suitable
hydraulic pump should be used to add oil and reserved for
this process . It is imperative that oil type be verified prior
to adding to a compressor. Oil should only be added to a
compressor while it is operating to observe valid oil sight
glass levels . Oil is pressure-injected either into a gauge
connection on the suction line or injected into the oil
process port at the bottom of the compressor housing .
Only enough oil should be added to raise the level above the
1/3 sight glass point.
WARNING
To avoid the release of refrigerant into the atmosphere,
the refrigerant circuit of this unit must be serviced only by
technicians who meet local, state and federal proficiency
requirements.
All refrigerant discharged from this unit must be recovered
WITHOUT EXCEPTION. Technicians must follow industry
accepted guidelines and all local, state and federal statutes for
the recovery and disposal of refrigerants.
If a compressor is removed from this unit, system refrigerant
circuit oil will remain in the compressor. To avoid leakage of
compressor oil, the refrigerant lines of the compressor must
be sealed after it is removed.
Variable Frequency Drive
Factory installed drive used to vary capacity and optimize
efficiency by modulating the speed of the compressor.
Please refer to VFD IO&M included with the unit .
Figure 16 - Variable Frequency Drive