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Table 3
4
overview
Maximum Chlorine Concentration
Maximum Operating Temperature
Maximum Feedwater Turbidity
Maximum Feedwater SDI
Oil and Grease
Operating pH Range
Cleaning pH Range
Sediment Filtration
System Requirements
For WaterGard to function correctly these three items are required:
• A WaterGard ready Marley LLC (liquid level control) or LLC+u water level
control system is required to communicate correctly.
• Municipal potable water will have residual chlorine levels that are too high
for WaterGard, therefore, a method of removal is required when any water
source has a free residual chlorine level above the requirements shown in
the Feedwater Requirements Table 3. This can either be done by purchas-
ing a carbon tank through SPX Cooling or using liquid chemical chlorine
destruct from a chemical water treater.
• A conductivity blowdown controller is required to monitor the water saving
WaterGard offers. This can be purchased with the WaterGard system.
WaterGard can remove up to 91% of an individual ion. How much of an
individual ion is removed depends on the ion. In some cases, the incoming
water in a galvanized cooling tower may have too low of a calcium value (<
50 ppm as CaCO
) making the water corrosive after WaterGard treatment.
3
In these situations it is recommended to initially fill the system with untreated
potable water. If the system level is low enough the internal bypass will au-
tomatically fill with mixture of treated and untreated water. Otherwise, if the
system level isn't low enough the external bypass will need to be engaged.
Once the system is full, WaterGard can be started and operated normally.
For additional information on soft water and its impact on tower metallurgy
consult you Marley sales representative.
WaterGard operates by rejecting ions down a small, concentrated waste
stream. This is typically 10-15% of the feedwater stream. Due to this, water
savings are not possible when the evaporative system operates at higher
cycles of concentration. Anything beyond 7 cycles of concentration can result
in increased water usage, not water savings.
Feedwater Requirements
< 0.1 ppm
113° F
1.0 NTU
5.0
Max 0.1 mg/L
2-10
1-12
5 microns
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