Daktronics AB-1600-1.5,2.5 - Manual (Page 57)

Maintenance & Troubleshooting
4-13
checked every 1500 hours of operation for accumulation of debris that could restrict airflow.
Check filters after the display has been in operation for 1500 hours—and every 1500 hours after that—
to ensure that the display is being cooled properly. Filters 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).
1500 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 to ensure that the fans are not operating when the display is not
running. 1500 hours is equivalent to 62 days if the display is on running non-stop, 24 hours a day.
The filter may be cleaned with a portable canister-type vacuum cleaner by gently vacuuming or by
blowing compressed air through the filter media. When using compressed air to clean the filter, the air
should be directed through the filter in the same direction that it flows during normal operation. The
direction of the airflow during normal operation is indicated by the arrow stamped on the outside of the
filter frame. Hold the air nozzle at least six inches (152.4mm) from the filter to avoid damaging
the filter material.
The filter may also be cleaned with water. A garden hose nozzle set to direct the water as a fine mist
works well. Hold the water nozzle back a few inches from the filter to prevent damage to the filter
media and direct the water flow in the same direction that the air normally flows. The filter media
should be allowed to dry completely before reusing. A mild detergent, like household dish washing
soap, may be used to assist in cleaning the filter media. Do not use any acid type cleaner or harsh
cleaning solvents.
It is recommended that spare filters be kept on hand at all times. Ideally, all filters could be replaced
during routine maintenance. The dirty filters could then be brought back to the shop, cleaned and
inspected, and would be available for use at the next job site.
The filter assembly has a 2-inch (50.8mm) wide piece of masking tape applied across the filter frame
and holder to provide extra security during shipping. The masking tape may have to be removed to
allow the filter to be removed the first time it is serviced using rear access.
If a filter media shows evidence of damage or wear, replace the filter with a Daktronics Filter
(Daktronics part no. 0A-1195-0029).
If a filter other than a standard Daktronics filter is used, make sure it meets the following
criteria.
•
The filter media must have an average arrestance of 83% and resistance = 0.06 (in inches of
water) or (1.52 mm) at 310 fpm or (94.5m/min).
•
The filter media must be cleanable, permanent 1/2”or 12.7mm thick, 25 PPI (25 pores per inch)
[3.88 pores per cm
3
] open cell polyurethane foam.
•
The filter frame size must be 15.62” by 19.62” by 1.88” (420mm by 498mm by 47.75mm) with an
effective filter area of no less than 3.4 square feet (2,194mm
2
)
•
The filter must be rated UL 900 Class 2.
In order to access the air filters from the rear of the display, 8 inches (203mm) of clearance are
required between the bottom of the air inlet hoods and catwalk level. 8 inches (203mm) is required to
allow the air filter to be removed and replaced without damage to the filter.