Desert Aire Aura QS Installation And Operation Manual page 68

68
Desert Aire - QS/QV Manual
typically a fitting installed on the outlet side of the receiver.
Returning to Service
• See section 5.5 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
activate 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.
- If acid is found, replace with activated charcoal cores and test at 24
hour intervals until 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.
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 QS-QV Series Compressor
Replacement Form located inside 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. Compressors longevity generally is a function of load,
lubrication, electrical input conditions, and temperatures.