Desert Aire Aura QS, Инструкция по установке и эксплуатации

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3.4 Refrigeration Testing
Refrigeration based cooling systems are sometimes referred to as “sealed systems”. This is in reference to
the refrigeration system being hermetically sealed, no refrigerant can leave the system and no contaminants
are allowed inside. Factory equipment and procedure ensure a clean and tight refrigeration system where
only the specified refrigerant and oil are in the system. This is a critical component to the longevity of the
system.
Some Desert Aire systems are shipped in sections to allow for installation of some of the sections in a location
much different than another. An example is a unit with a remote condenser ready circuit. The dehumidifier
may be installed indoors near the conditioned space while the remote condenser used to reject waste heat is
located outdoors. The piping of the condenser is completed in the field before the unit is commissioned. The
design and processing of the field piping is just as important as the factory piping in ensuring the longevity
of the system.
Selection of quality components, quality procedures, and full testing help to ensure the sealed system failures
are minimized wherever possible. Nonetheless, the mechanical nature of many components creates some
unforeseen wear and failure in certain instances. Some units may need service at a point in the life of the
product that requires opening of the hermetic refrigeration system. Special care must be taken to ensure that
the system is returned to service without contamination.
Whenever servicing Desert Aire equipment, observe the following:
• Use only equipment rated for the pressures of the refrigerant being serviced.
• Use only equipment dedicated to service the refrigerant in the system. Do not use equipment to
service multiple refrigerant types.
• Purge all hoses and equipment of non-condensable gasses before connecting to the sealed system.
• Use only original equipment parts or factory approved equivalent for servicing.
• Use required refrigerant system oil.
• Minimize the time the system is open to atmosphere while servicing. Cap all connections when there
is no active service work on the system. This is particularly important with units that contain POE oils
as moisture will be absorbed quickly and cannot be removed with a vacuum.
• Never open the system while under a vacuum. Should system require opening to repair a leak or
other service when in vacuum, fill with dry nitrogen to atmospheric pressure before opening.
• Have a Schrader core replacement tool available when servicing the refrigeration system. Although
rare, defective or damaged Schrader valve cores can contribute to refrigerant loss.
• Charge systems only by weight after servicing. Review the rating plate and any field charge labels.
• When servicing, additional liquid line filter dryers and suction filters may be required. This does not
Desert Aire - QS/QV Manual