AGL_Unit_LOCU_EN_Rev00
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still be in the system. While this may not affect the reliability of the replacement compressor, the extra
oil will add to rotor drag and increase power usage.
▪
De-energize the ref rigeration unit before any intervention.
▪
Close valves to isolate the unit from the system.
▪
Recover the refrigerant from the unit and make sure that the compressor is not under pressure.
▪
Release the compressor mounting parts then lift it to replace with a new compressor.
NOTE: For more detailed instructions, please refer to the compressor application guidelines.
5.3 Electrical terminations
WARNING
Isolating switch "On"! Electrical shock hazard!
Turn of f the main power
supply to de-energise the unit before undertaking any task on the electrical
equipment.
All ref rigeration units will generate some degree of vibration. Copeland LOCU ref rigeration units are
no exception. Over time, due to the slight vibrations and to temperature f luctuations within the unit
housing, electrical terminations may become loose. The components most likely to be affected are
the main terminal strip and the compressor contactor. It is recommended to check the main electrical
terminations for tightness and to carry out a visual inspection of the low voltage crimped terminals at
least once every 6 months.
In all cases, if metal covers (with grounding connections) have been removed for maintenance, all
grounding connections have to be reconnected before unit operation when the covers are put back
in place.
5.4 Condenser fins
CAUTION
Acid cleaning! Corrosion of condenser fins!
Do not use acidic solutions to
clean the coil. After cleaning, the f ins should be brushed lightly with a proper
f in comb.
Condenser f ins become dirty over time as ambient air is induced to the condenser. Dirty coil surfaces
result in high condensing temperatures and poor unit perf ormance. Regular cleaning is
recommended, the f requency of doing so being dependent on the installation and the surrounding
environment. As a general guide, it is advisable to do this at least once every two months.
As a rule, and f or a clean environment, Emerson recommends that the f ins be cleaned with liquid
detergent diluted with clean water. The ref rigeration unit has a well-designed chassis, and provided
the unit is installed level, any cleaning solution should be able to drain away. A light brush downward
(in the direction of the fins) should be done before washing to remove heavy deposits.
NOTE: In order to meet the requirements of the Ecodesign Directive 2009/125/EC with regard
to efficient system operation, ensure the heat exchangers remain clean at all times.
5.5 Routine leak testing
CAUTION
Leaking system! System breakdown!
It is recommended to periodically re-
torque all pipe and fixing connections to the original settings after the system
has been put into operation.
All joints inside the system should be leak-tested as part of a regular maintenance schedule. The
checking f requency is described in standard EN 378-4, Annex D. Emerson recommends checking
the system tightness at least every 6 months.
Torque settings of system valves and adaptors with Rotalock connections might decrease
significantly af ter some time in operation. Recurring temperature changes, vibration and other
inf luencing parameters can lead to expansion and contraction of the metal material and a relaxation
of the gaskets. It is recommended to periodically retorque the Rotalock connections to the original
settings.
Summary of Contents for Copeland OLE-49
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