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such as a manometer or magnehelic. This can usually be done by slipping the manometer
tubing through a door or window leading outside.
7. If desired, measure the exhaust air flow rates through the use of direct measurement device
such as hood, velgrid, or anemometer.
8. Repeat the procedure for the other modes as desired by changing the Exhaust Mode. The
modes available are dependent on the types requested at the time of unit order. These may
include “Unocc”, “Occ”, “Event”, “Max. OA”, and “Purge”. Note that controller power will need
to be removed after completing “Purge” mode as the post-purge operation will lock out
outdoor air operation for 30 minutes after purge.
It should be noted that filter changes are important to ensuring that exhaust air and outdoor air are able to
be maintained at the proper flow rates. The SelectAire™ system operation will automatically adjust to
accommodate normal increase in static pressure drop, but excessive filter loading will restrict airflow.
Filters should be monitored and replaced as required.
Evaporator Settings and Cool Exhaust Airflow
There may be additional display screens for the evaporator and cool exhaust airflow. The values are present
from the factory and optimized. No adjustment is required unless instructed by Desert Aire Service.
3.2.3 Final Air Balancing
Once the supply air and exhaust air setup have occurred, the unit will automatically
adjust the damper positions and drive speed in each mode of operation.
The outdoor air damper will open and modulate to achieve the pre-determined
pressure drop set point of the outdoor air stream pressure plate. This has been
determined by the customer requested occupied mode flow rate and tested at the
factory. The exhaust will be controlled by space pressurization and maintains the
negative static pressure set point.
At this point there is a good opportunity to ensure that the commands for operational modes
are being properly sent to the equipment. Command each mode of operation through the method
that will be used on site. Depending on the mode and installation specific, this may occur through
the internal time schedule, a contact closure, or the Building Management System.
The Desert Aire SA unit with exhaust fan 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.
Desert Aire - SA Manual
Summary of Contents for SA Series
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