AEC TK Series Cooling Tower Water Treatment Systems - Manual (Page 5)

5
TK SERIES
AEC, INC .
Getting to Know Your Cooling Tower Water Treatment System.
MAIN COMPONENT DESCRIPTION
A. SAND FILTER
This high-rate sand filter is a vertical pressure vessel with a special influent baffle in the top
of the tank, a bed of filter sand and an underdrain system which collects the filtered water
and directs it to the return piping. The filter operates under pressure. When closed
properly and operated without air in the water system, this filter will operate safely. The
system is equipped with a manual high-flow air release valve, an automatic pressure relief
valve set at 35 psi. With influent and effluent pressure gauges mounted on the control
panel support stand.
B. ACTUATED CONTROL VALVE ASSEMBLY
The valves are 24 volt, electric actuated, CPVC Three way diverting valves.
C. PUMP AND MOTOR
The pump has a cast brass impeller, motor bracket, and volute with stainless steel
fasteners to resist corrosion. The drip-proof, cool running, mechanical seal virtually
eliminates burnout and provides easy access for replacement. The pump is self-priming.
The totally enclosed motor with its external fan-cooled construction allows for operation in
noncombustible, dusty, dirty atmospheres. It is double shielded with pre-lubricated ball
bearings on both ends, has a NEMA 56C frame, and high tensile steel shaft, enclosed in a
heavy gauge rolled steel case. Motors are UL approved and CSA stamped.
D. STRAINER
The pump suction strainer assembly is fabricated of fiberglass reinforced noryl with a total
capacity of 440 cubic inches and is rated for a maximum operating pressure of 50 psi. It
has a clear lexan lid for viewing the integral cycolac strainer basket. The lid is held in place
by a stainless steel band clamp and includes an o-ring gasket for positive seal. The pump
strainer on TK -80 systems does not have the clear lexan lid. Extra care should be taken
during installation to provide a shut off valve in the inlet line to the pump (close to the
pump) so frequent inspections of the basket strainer can be made.