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D. Conductivity Control (Control Package #2)
A conductivity controller monitors the electrical conductance of the cooling water. If the conductivity of the
cooling water exceeds the front panel setpoint, the controller activates a "blowdown" process. During this
process, some of the highly conductive water is drained from the sump and fresh water is added to dilute the
concentrated water. When the conductivity level falls below the setpoint, the controller shuts down the
"blowdown" process. Refer to the calibration procedure in the Conductivity Controller Installation, Operation
and Service Manual.
___ Conductivity controls work properly. Operation can be simulated by depressing and holding the
"simulator" button on the conductivity controller while the evaporative cooler is in operation. This will
open the "blowdown" contact, de-energizing the timer and open the sump drain valve. When the
"simulator" button is released, the "blowdown" contact closes. This energizes the time clock for five
minutes. After five minutes, the drain valve closes.
E. Auto Flush Control (Control Package #3)
___ Water supply line and flush valve solenoid (normally closed) are installed in the proper location at the
top of the evaporative cooler. (See mechanical drawing #40085830.)
___ Flush valve solenoid is wired properly.
___ The time clock schedule is set to desired auto flush interval and length of auto flush.
___ Auto flush circuit works properly. When time clock initiates auto flush sequence, the flush valve solenoid
(normally closed) open and supplies fresh water over the media. At the same time, the pump motor de-
energizes and the sump drain valve opens to drain sump.
F. Comments
SECTION 26: RAPID
®
4000-S
S
ERIES
-U
P
: E
TART
P
ROCEDURES
VAPORATIVE
149 of 154
C
OOLER
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