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Indicators for concern
1. Cycles of concentration are too high or too low: For each installation, there is a recommended
cycles of concentration. This is achieved by properly setting the blow down conductivity point. If
cycles are too high, water quality deteriorates and may exceed the treatment capability, causing
performance problems. If cycles are too low, there will be too much blow down, thus reduced
water saving. Also, cooling water may not get enough CHC treatment at low cycles.
Examples of causes for changes in cycles of concentration: a). Conductivity meter is out of
calibration and not working properly. The Conductivity meter should be cleaned and calibrated for
each visit. b). Changes in evaporation rate due to system load or weather. c). Changes in makeup
water chemistry.
2. Changes in makeup water chemistry: This is usually caused by changes in the source of makeup
water. Well water (ground water) is generally quite stable for each well but could change
significantly from other wells nearby. Surface water changes with seasons. Some cities use a
combination of different water sources for municipal water.
3. Changes in hardness and alkalinity in makeup water will changes the scaling tendency. Changes in
chloride also changes water’s corrosivity. Changes in conductivity (TDS) directly affect cycles of
concentration. Therefore, conductivity set-point may need to be adjusted.
4. Relative calcium concentrations of sump water and makeup: When makeup water chemistry and
cycles of concentration are stable, changes in sump water calcium hardness may indicate changes
in the performance of the CHC system.
5. Significant increase in bacteria population: Often this is caused by contamination. Follow-up
sample is recommended. Survey the system and find out the cause.
Summary of Contents for CHC
Page 1: ...INSTALLATION SERVICE MANUAL FOR THE CHC WATER TREATMENT SYSTEM ...
Page 21: ...21 User Screen Structure E coW aterC H C CHC C H C C H C ...
Page 22: ...22 CHC CHC CHC ...
Page 26: ...26 F80 F300 Skid Equipment Views ...
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