15
Water Make Up Valve
A mechanical float valve assembly is provided as standard equipment on the evaporative cooling
unit (unless the unit has been ordered with an optional electronic water level control package
or the unit is arranged for remote sump operation). The make up valve is easily accessible from
outside the unit through the access door or removable air inlet louver. The make up valve is a
bronze valve connected to a float arm assembly and is activated by a large foam filled plastic
float. The float is mounted on an all thread rod held in place by wing nuts. The water level in the
basin is adjusted by repositioning the float and all thread using the wing nuts. Refer to Figure 12
for details.
Figure 12 – Mechanical Water Make Up Valve
The make up valve assembly should be inspected monthly and adjusted as required. The valve
should be inspected annually for leakage and if necessary, the valve seat should be replaced.
The make up water pressure should be maintained between 140 and 340 kPa.
Drift Eliminators
Check the drift eliminators quarterly to make sure the drift eliminators are still in the correct
position and not clogged by any debris.
If required after inspection, drift eliminators must be removed, cleaned and reinstalled correctly.
On forced draft models, the worker must use personal precautions and adequate safety
measures against the risk of a fall, in accordance with local regulations. Remove one or two
eliminator sections from the top of the unit, protect the fill by use of a hard board before entering
the unit and walking on the fill. Never walk on the eliminators! Once standing on the fill, the
remaining drift eliminators can be removed.
On induced draft models, lifting handles are provided along the top layer of eliminators. Remove
one or two eliminator sections, protect the fill by use of a hard board before entering the unit and
walking on the fill. Never walk on the eliminators! Once standing on the fill, the remaining drift
eliminators can be easily removed through the access door.
Pressurized Water Distribution Systems
All EVAPCO cooling towers are supplied with wide orifice water diffusers. The water distribution
system should be checked monthly to make sure it is operating properly. Always check the spray
system with the pump on and the fans off (locked and tagged out).
On forced draft units (LSTE, LPT and PMTQ models), remove one or two eliminator sections from
the top of the unit and observe the operation of the water distribution system.
On induced draft units (AT and UAT models), lifting handles are provided on several sections of
eliminators within reach of the access door. Eliminators can be easily removed from outside of
the unit to observe the water distribution system. The diffusers are essentially non-clogging and
should seldom need cleaning or maintenance.
FLOAT BALL
MAKE-UP VALVE
FLOAT ARM
ADJUSTMENT
WINGNUTS
Summary of Contents for AT 110-112
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