AEC TK Series Cooling Tower Water Treatment Systems - Manual (Page 6)

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TK SERIES
AEC, INC .
E. MEDIA SAND
Filter media is shipped with the unit for field installation. The filter media is quartzite of
silica with a relative size of .45 to .55 mm & 1.7 uniform co-efficient. Clean filter media
will remove particles 20 microns in size and larger. Accumulated material on the top of the
media bed, called a filter cake, contributes to finer particle removal as the filter becomes
"dirtier". Removal of over 99% of 10 micron particles and 90% of 5 micron particles can be
expected over the course of a filter cycle.
F. REACTION MEDIA & REACTION COLUMN
The reaction column contains a patented high purity redox media. The media is a blend of
two dissimilar metals in a 50:50 ratio. The naturally occurring electrical potential between
these dissimilar metals creates an electron exchange effecting the crystal structure of and
preventing the formation of hard scale while creating an unfavorable environment for
bacteria, algae and corrosion. The reaction column has been specifically designed to
provide a controlled, up-flow pattern of the process water through the reaction media while
retaining the media within the column.
G. CONTROL PANEL
The control panel provides all controls for flow monitoring and automatic backwash
operations. The control panel is UL Listed, and includes the following standard items:
NEMA 3R enclosure; motor starter with thermal overload protection; transformer to convert
supply to 24 and 110 VAC control power; power disconnect; differential pressure switch to
initiate backwash (external to enclosure); adjustable timing controls; manual on/off switch;
self-powered flow monitor and manual backwash initiation switch. The sequence of the
adjustable timing controls is described under the Operation section of this manual. The
controls automatically stop the system's pump whenever valves are to be shifted which
prevents water hammer and pipe flexing.
H. SHUT-DOWNS
The TK SERIES system is designed to provide full effective operation, 24 hours per day, 7
days per week. If the system is to be shut down for any more than 5 days you should drain
the reaction columns of water. This can be accomplished by opening the ½” drain valve
slightly.