ClimaCool UCR 30, 50 and 70 tons Manual - Manual (Page 50)

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50
Compressor Information
The compressors used on the ClimaCool chiller are scroll
compressors. They are highly effi
cient and extremely
reliable. However, the information contained in this manual
will be useful for their care.
Compressor Rotation
All scroll-type machines are unidirectional and will only
compress in one direction. Operating in the reverse rotation
can 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 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 scroll compressors used in ClimaCool chillers
is polyester type oil, (POE), and is intended for R-410A
refrigerant use. All POE 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 POE oils from sealed metal cans. Suitable POE oils
are:
• Copeland Ultra 22 CC
• Mobile EAL Arctic 22 CC
• ICI Emkarate RL 32 CF
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 start-up. The
normal operating compressor oil level should e between 1/3
and 1/2 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. This could
take up to 6 hours of operation. The compressor should not
be allowed to operate with less than 1/8” oil sight glass for
an extended period of time. (Longer than 4-6 hours).
Adding Oil
The compressor must never be run in a vacuum. A suitable
bydraulic pump should be used to add oil and reserved
for this process. 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.