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Desert Aire - LC/LV Manual
Procedure:
1.
Check condition of the air filter(s) to assure that they are clean.
2.
Check for any obvious restrictions in the ductwork.
3.
Start the supply air blower.
4.
Index unit to unoccupied mode. This can be done by setting the number of
active occupied schedules to “0” AND ensuring the occupancy jumper is
not installed. Building management system network occupancy signal should
be indexed to “Off” if equipped. All three methods of occupancy command
must be in the unoccupied position. Check the unit display STATUS screen to
ensure unit is in the unoccupied mode.
5.
Confirm outdoor air damper is closed.
6.
Use a manometer or magnehelic pressure gauge to measure the static air
pressure differential across the reheat condenser (ports #2 and #3 above).
Reading should be within limits indicated in Figure 25. Adjust the fan speed as
required to achieve the indicated pressure differential.
7.
Use the manometer or magnehelic pressure gauge to measure the static
pressure differential across the evaporator coil (ports #1 and #2 above).
Reading should be within limits indicated in Figure 26. Adjust the evaporator
bypass damper opening by using the control interface to adjust the “Evap”
“Unocc” damper setting. This is located in the DAMPER SETTINGS menu
under the SERVICE MENU. Adjusting the value to a greater percentage will
open the damper and decrease the pressure differential. Adjusting the value
to a lower percentage will close the damper and increase the pressure
differential. Use only the controls to adjust the damper position. Do not
manually limit the stroke of the damper by using mechanical stops.
8.
Use a manometer or magnehelic pressure gauge to re-check the static air
pressure differential across the reheat condenser (ports #2 and #3 above).
Adjust the fan speed as required to achieve the indicated pressure differential.
9.
Index unit to occupied mode. This can be done by setting the number of active
occupied schedules to “1” and ensuring that the current time is within the
occupancy time of the first schedule. Alternatively, the occupancy jumper can
be installed or the building management system can be connected and the
network occupancy signal should be indexed to “On”. Any one of the three
methods can be used, but it is recommended that the method that will be used
in normal unit operation be tested during this step. Check the unit display
Summary of Contents for ExpertAire LC Series
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