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COOLER CONTROL COMPONENTS
WATER MANAGEMENT SYSTEM
The cooler contains multiple parts to supply, distribute and
manage the water needed for the heat exchangers.
Water Inlet Solenoid Valve
The inlet solenoid valve allows water into the water reservoir.
Once open, the inlet solenoid valve will remain open until the
water high probe has detected water for at least 5 seconds.
If the water drain valve is open, the inlet solenoid valve will
remain closed.
Indirect Pump (Left Pump)
The indirect pump moves water from the reservoir to the 8
indirect heat exchangers.
The indirect heat exchangers do not require continuous
watering and the indirect pump runs on the following cycle
•
Indirect Pump ON time = 8 seconds
•
Indirect Pump OFF time = 60 seconds
Direct Pump (Right Pump)
The direct pump moves water from the reservoir to the Chillcel®
media.
The Chillcel® does not require continuous watering and the
indirect pump runs on the following cycle
•
Direct Pump ON time = 5 seconds
•
Direct Pump OFF time = 31 seconds
Water Salinity Control
As water evaporates from the heat exchangers, the salinity of
the remaining water naturally increases.
The water management system uses the 3-pin water probe to
measure water conductivity as a proxy for salinity. The probe
can sense conductivity down to 9 µS (about 4ppm) .
Water conductivity is updated every time water reaches the high
probe and, when it exceeds the upper set point, a salinity drain
cycle will start.
Chlorinator Control
The chlorinator is a pair of specially treated plates. When
energised and submerged in water, electrical current flows
between them generating chlorine which is known to kill
bacteria in water supplies.
The chlorinator is active when the cooler is in COOL mode,
AND the water level is above the bottom probe AND the water
conductivity is >1500 µs/cm.
If the water conductivity remain <1500µs/cm for 24 hours a
clean tank drain cycle will start.
Water Tank (Reservoir) Drain Valve
The drain valve will automatically close when power is first
applied to the cooler.
During a salinity drain cycle, the drain valve opens until the
water level falls below the low probe, then the drain valve
immediately closes, and the inlet solenoid valve opens to refill
the reservoir with fresh water.
During a clean water drain cycle, the drain valve remains open
for 10 minutes, after which, the inlet solenoid valve opens to
refill the reservoir with fresh water.
The drain valve will open if it has been 3 days since COOL
mode was last run.
Indirect Heat Exchanger Dry Cycle
When the cooler exits COOL mode and has been idle for 50
minutes, a drying cycle is initiated.
The drying cycle is designed to prevent mould growth, maintain
tank water quality, reduce indoor odours and to preserve the
integrity and longevity of the indirect heat exchange cores.
When a drying cycle is active, the exhaust fan will run at Speed
1 for 45 minutes.
859741-L CW3 INSTALLATION MANUAL
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