Desert Aire Aura QS, Installation And Operation Manual

Page: 67 / 94

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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 of 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
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.
Long-term 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 line 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 a 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. There is
Desert Aire - QS/QV Manual