12
Water Saver Mode
Maximum Water Savings
In Water Saver Mode, water savings are
maximized by leveraging the dry efficiency of the
hCore
®
Heat Transfer Technology and operating
without spray water. To meet increasing loads, the
EC Fan System will automatically and intelligently
increase speed and the spray pumps will activate
only when necessary (Winter Guard Disabled).
Within Water Saver Mode, there are two options:
1.
Winter Guard Disabled (Recommended)
:
When demand increases and calls for heat
rejection, each pump will turn on when
demand exceeds the capacity of the unit
while running dry. This mode is recommended to ensure that heat load can be rejected
by evaporative cooling when required.
2.
Winter Guard Enabled:
When demand increases and calls for heat rejection, all fans
ramp up simultaneously, and all modules will only run dry. This mode is typically
utilized when the make-up water line has been winterized / shutoff to the unit during
cold weather and / or the load is greatly reduced during winter months.
Spray Water Basin and Pump Water Control
• Verify that incoming water pressure is between 20 and 75 psig.
• When the iPilot
®
Control System calls for evaporative cooling, the solenoid make-up
valve will open, the mechanical make-up valve will open, the drain valve will close,
and water will fill the basin.
• Once the water reaches operating level, the mechanical make-up valve will close, there
will be a brief delay, and the pump(s) will cycle on in a staged operation to recirculate
water.
• As water evaporates, the mechanical make-up valve will open to ensure that the water
level is maintained.
• If the pump receives a signal to operate and the water level is too low, the iPilot®
Control System will indicate a corresponding fault and the system will switch to Water
Saver Mode with Winter Guard enabled. To re-enable evaporative cooling, correct the
issue and reset the alarm on the user interface.
DRY
MAXIMUM WATER SAVINGS
Figure 8.
Water Saver Mode
Figure 9.
Spray Water Basin
Drain Valve
Water Diverter
Access Panel
Overflow
Mechanical Make-up
Valve
Spray Pump
Solenoid Make-up Valve
High/Low Level Switches
NOTE
: Be sure to open make-up
supply line before Winter Guard is
disabled and confirm that the spray
water basin is filled. .
Содержание NEXUS NXF-0403N-CS2TS-H1
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