Greenheck DGX Installation, Operation And Maintenance Manual page 40

Filters
Filter maintenance is generally limited to cleaning and
replacement.
If aluminum mesh filters are installed, they can be washed in
warm soapy water.
An adhesive spray can be added to aluminum mesh filters to
increase their efficiency.
If disposable filters are installed, they can be check by
holding up to a light source. If light cannot pass through the
filter, it should be replaced.
Evaporative Coolers
The media should be periodically brushed lightly with a soft
bristle brush in an up and down motion while flushing with
water. This aids in reducing the amount of mineral build-up.
For large amounts of mineral build-up, clean or replace the
media and increase the water bleed-off or flush rate.
The cooling media has a useful life of 3 to 5 years depending
on the water quality and the bleed-off or flush rate.
IMPORTANT!
Replacement media should be from the same
manufacturer and be the same size as the original
media provided with the unit.
Cooling Coils
Inspect the coil for signs of corrosion and/or leaks. Repair
any leaks as required.
Inspect the coil's surface for foreign material. If the coil
surface needs cleaning, clean the coil from the leaving air-
side so that foreign material will be washed out of the coil
rather than pushed farther in.
Inspect and clean the drain pan to prevent the growth of
algae and other organisms.
Chilled Water Coils
Test the circulating fluid for sediment, corrosive products and
biological contaminants. Make the necessary corrective
measures.
Maintain adequate fluid velocities and proper filtering of the
fluid.
If automatic air vents are not utilized, periodic venting of the
coil is recommended to remove accumulated air.
Maintenance - Routine
When reinstalling filters be sure to install
them with the airflow in the correct
direction. An airflow direction arrow is
located on the side of the filters.
Replacement filters should be from the
same manufacturer and the same size as
the original filters provided with the unit.
When reinstalling the evaporative media,
make sure that it is installed correctly.
Reference figure #64.
Entering Air
Figure 64. Media Orientation
Repair and replacement of the coil and
the connecting piping, valves, etc.,
should be performed by a qualified
Be sure to read and follow the
manufacturer's recommendations before
using any cleaning fluid.
Caution should be used to avoid injury
when venting the coil. High pressure
and/or high temperature fluids can cause
serious injuries.
40
IMPORTANT!
IMPORTANT!
IMPORTANT!
Leaving Air
15°
WARNING!
individual.
IMPORTANT!
CAUTION!
45°