Daktronics AF-3165-34-RGB - Manual (Page 56)

Maintenance and Troubleshooting 4-14
4.5 Ventilation Systems (With Fans and Filters)
Ventilation fans should be checked after 1,500 hours of operation and every 1,500
hours after that to ensure the display is being cooled properly. Fans should be
checked more often if the display is located in a dusty or harsh weather environment
(i.e. along a gravel road with dust laden air).
• 1,500 hours is equivalent to 83 days if the display is operated for 18 hours a
day and the power to the display is turned off when not in use
• 1,500 hours is equivalent to 62 days if the display is running non-stop for 24
hours a day
• Each time a module is removed, for whatever reason, take a minute to
inspect the fans
• Check the fan blades for dirt and debris. If the fan blades have a large
accumulation of dirt and debris, this indicates that the filters must be
cleaned/changed more often. Fan blades must be kept clean to maintain fan
efficiency and ensure proper cooling
• Spin the fan blades with a pen or pencil to ensure that the bearings are free
and the fan is still in balance
To check the operation of the fans, push the bypass button (momentary contact) on
the thermostat enclosure to temporarily turn the fans on: (The bypass button is
located behind A102, top row, and second module from the left.)
• Hold your hand or a piece of light paper beneath the display to detect air
movement
• If the fan does not turn or does not operate smoothly, replace it
Filters must be checked once a year or after every 1,500 hours of operation,
whichever comes first.
Filters can be cleaned with water and a mild detergent, such as dish soap. (Allow the
filters to dry completely before reinstalling them in the sign.) Compressed air can
also be used to clean the filters provided the nozzle is held at least six inches away
from the filter, the pressure is no greater than 60 psi and the air is blown through the
filter in the opposite direction from which air normally flows. The arrow stamped on
the frame filter indicates airflow direction.
4.6 Thermostats
Reference Drawing:
Comp. Layout Diagram.............................................Refer to Appendix A
A thermostat controls when the ventilation fans are turned on in the display. Refer to
the Component Layout Diagram and
Figure 37 for the location of the thermostat.
The thermostat is located behind in the top row, second column of modules.
The ventilation fans turn on when the inside of the display reaches 85
° F (29° C),
and turn off at 70
° F (21° C).