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Acid Indicated
•
Install a suction line filter shell and charcoal activated core such as a
Sporlan or Emerson HH core type or equivalent. The acid levels will be
monitored and several core changes may be required. Install ball valves
on either side of the suction filter to facilitate these changes. Note that larger
Desert Aire systems will have suction filter shells installed from the factory.
The shell can be used with charcoal activated cores. Note that a "safety
screen" may be required with some manufacturer's cores to prevent small
pieces of the core from dislodging and finding their way to the compressor.
Follow filter shell and core manufacturer's instructions.
•
Review compressor and suction line for area where future oil samples can
be taken from the system. If an access fitting exists on the compressor shell
below the oil level, no further action is needed. If this is not available, an
access fitting can be located at the bottom of a trap in the suction line. Braze
in a fitting as required to be able to remove an oil sample. NOTE: It is
acceptable to use acid test kits that sample the refrigerant and connect to
Schrader fittings.
•
Ensure there are access fittings directly upstream and downstream of the
suction filter. There is typically one fitting installed on the suction filter.
There may be a bulkhead fitting attached to the compressor suction side.
•
Do not use acid neutralizing additives or other chemicals for acid removal.
The refrigeration system must contain only oil and refrigerant. Precipitates of
additives and acids may be considered contamination in the refrigeration
system. Other compounds may be present in additives as carriers. Longterm
effects of specific additives or compounds with a particular system or
design are unknown without significant controlled testing.
Particulate Indicated
•
Install a replaceable core liquid line filter shell. Note that larger Desert Aire
systems will have replaceable core liquid filter shells installed from the
factory. The pressure drop levels will be monitored and several core
changes may be required. Install ball valves on either side of the filter shell
to facilitate these changes.
•
Install a secondary filter such as Sporlan FS-series or equivalent 20 micron
filter in the replaceable core.
•
Ensure there are access fittings directly upstream and downstream of the
liquid filter. There is typically one fitting installed on the filter shell.
35
Desert Aire - LW Manual
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