ClimaCool UCW_H 30, 50, 70, 85 - Manual (Page 36)

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Compressor Information
Model UCW/H uses scroll compressors which are highly
efficient and extremely reliable. 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 loud operating
noise together with a lack of compression .
Compressor Anti-Short Cycle Timer
Built into the logic of the CoolLogic Control System is an anti-
short cycle timer which will prevent the compressors from
restarting immediately following a compressor shutdown .
Minimum on 75 seconds and minimum off 200 seconds.
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 scroll compressors will be either Polyolester type
oil (POE) or polyvinyl-ether type oil (PVE) . Both 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 both 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 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 six
hours of operation . The compressor should not be allowed
to operate with less than 1/8 of the sight glass for longer
than four to six hours .
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 ⅓
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.
! ATTENTION INSTALLER
3 Phase Scroll Compressor Units
• If this unit uses a 3 Phase Scroll Compressor, the following
instructions MUST BE followed:
- Unit power supply MUST BE wired in the proper sequence to avoid
damage to the 3 Phase Scroll Compressor;
- Scroll Compressors with INCORRECT rotation show the following
characteristics:
1.) High sound level;
2.) High suction pressure and low dischage pressure;
3.) Low current draw.
- If any of the three above characteristics exist, swap two of the
three supply wires at the disconnect and recheck compressor for
incorrect rotation.