Daktronics AF-3150-20-R,A - Manual (Page 50)

Figure 45: Quick Connect Boards
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
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, as shown in
Figure
35 .)
Maintenance and Troubleshooting 4-12