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36
Desert Aire - LW Manual
Returning to Service
•
See Section 5.4 for evacuation and charging.
•
Restart unit and set unit to run compressors.
•
Record the pressure drop across the suction filter and liquid line filter dryer.
•
Check sight glass indicator for moisture level.
•
Monitor pressure drop across the liquid and suction filters during the
first hour of operation. Compare the reading taken earlier. If the
pressure differential across the filters is 5 PSI or greater, isolate the
filters using the valves installed and recover the refrigerant from the
filters. Replace cores. If activated carbon filters were installed in the
suction side to remove acid, replace with similar cores. If a secondary
filter was installed in the liquid line core to remove particulate, install
cores and secondary filter in this location.
•
Run unit for 24 hours and review acid levels (if found previously) and
pressure differentials.
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Testing and Final Diagnosis
It is of critical importance to ensure that the system is operating as expected
before unit is returned to normal service. Complete a LW Series Compressor
Replacement Form located in the back of this manual. Validation of this report
allows for the continued coverage of the compressor under the original
warranty.
It is possible that there was an internal defect in the compressor or normal
mechanical wear occurred over time. Compressor longevity generally is a
function of load, lubrication, electrical input conditions, and temperatures.
The cause for the compressor failure must be identified before unit is placed
back into full service. Both the identification of the cause of compressor failure
and the proper cleanup of the system must be addressed to avoid repeat
compressor damage.
If acid is found, replace with activated charcoal cores and test
at 24 hour intervals unit acids are at acceptable levels. Once
acid is no longer detected, replace cores with standard filter
elements. Remove outlet screens if they were required by
filter manufacturer.
If the pressure differential across the liquid line filter is 5 PSI
or greater, replace cores and secondary filter with new
components and test at 24 hour intervals until pressure drop
is at acceptable levels. Once pressure differential is less than
5 PSI, remove secondary filter and replace cores.
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