34
AGL_Unit_LOCU_EN_Rev00
IMPORTANT
Inadequate charge! Overheating!
The scroll compressor design requires the
system to be charged as quickly as possible with liquid ref rigerant into the
liquid line. This will avoid running the compressor under conditions whereby
insuf ficient suction gas is available to cool not only the motor but also the
scrolls. Temperature builds up very quickly in the scrolls if this is not done.
IMPORTANT
Refrigerant leakage! Contamination of surroundings!
In case of leakage
the surrounding area can be contaminated with a mixture of oil and refrigerant.
Periodically check the system for leakage.
Bef ore charging or re-charging, the system must be leak- and pressure-tested
with appropriate purging gas.
Ensure that the ref rigerant system is grounded prior to charging with refrigerant.
Pre-charging must be carried out with liquid refrigerant through the service valve on the liquid line. It
is advisable to pre-fill the suction side with a partial charge to avoid vacuum operation. Further
charging can be done by caref ully f illing ref rigerant through the suction line while simultaneously
checking the sight glass.
Extreme care shall be taken not to overf ill the system with ref rigerant. The system
manuf acturer/installer must respect the charge limitations according to valid standards, such as but
not limited to EN 378.
NOTE:
In order to meet the requirements of the Ecodesign Directive 2009/125/EC with regard
to efficient system operation, ensure the refrigerant charge is sufficient.
4.2.2 Charging level in liquid receiver
The liquid receiver is equipped with 2 sight glasses, one at approximately 30 % charging quantity
and one at 80 % quantity. The level watch device sends an alarm to the system controller at 20 %
charging quantity.
Figure 33: Charging level in liquid receiver
4.2.3 Oil charging procedure
Copeland LOCU refrigeration units are pre-charged with oil. After commissioning, the oil level should
be checked and topped up if necessary.
As mentioned in
section 2.6.1 "Qualified refrigerants and oils"
, Emerson recommends charging
with one of the following oil types:
▪
Emkarate RL 32 3MAF
▪
Mobil EAL Arctic 22 CC
Charging on a system in operation can be done through the Schraeder valve located on the suction
shut-off valve.
For an empty system the service connection port on the oil reservoir outlet can be used
– see
Figure 34
below.
Summary of Contents for Copeland OLE-49
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