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Desert Aire - SP Manual
The Desert Aire SP unit contains operational controls that assist in maintaining the
poolroom envelope at a negative static pressure. Proper setup allows these
controls to operate as intended; however, these are not safety controls. It is the
responsibility of the owner/operator to ensure that proper space pressurization of
the envelope occurs. It is recommended that the pressurization be checked on a
regular basis to ensure proper operation of all building systems and any issues
corrected immediately.
Final Review of the Unit Operation
Under typical circumstances, the unit will cycle into and out of a mode of operation over a period of
time. This will typically continue until the environmental conditions change or another outside
influence causes the load to differ. The duration of each cycle will depend on the unit capacity and the
activity within the space as well as the building construction, set point, and ambient conditions.
The controller is programmed with minimum mode times that prevent short compressor cycles and
quick indexing of modes. This minimum mode time is set at 360 seconds as a default. When the
loads are very low and the unit is relatively large for the application, this may cause a slight overshoot
in space condition for cooling and dehumidification. Frequent cycling between heating and cooling is
not expected, however.
It is recommended that as a final check that the unit be released from all overrides, offsets, and
returned to the expected set points. Observation of the typical operation under load is an invaluable
tool in ensuring that all aspects of the system are working as anticipated. Observing the unit control
the space for a few cycles is recommended. This can be done reasonably well as the tools and site is
being cleaned up at the end of the startup or service call.
3.3 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 procedures 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 from 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.
Summary of Contents for SelectAire Plus SP Series
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