AERCO Electronic Controls System (ECS) - Manual (Page 40)

Electronic Control System (ECS) and Type CXT-E Valve
6. ROUTINE MAINTENANCE
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AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 VD2: 02/28/14
OMM-0003_0D AC-105
7) Periodically test the solution for effectiveness to determine if more HydroSkrub is needed.
Refer to “Testing hydroSkrob Effectiveness” in the next paragraph for details. If the cleaning
solution is expended before circulation time is up, additional HydroSkrub will be needed and
circulation time may be extended to complete the cleaning.
8) Upon completion of the cleaning process, begin flushing the solution by adding clean water
to the circulation bucket, then disconnect the return valve and hose connection from the top
of the circulating bucket and thoroughly flush. Continue water flushing the equipment for a
minimum of 10 minutes or until discharge runs clear.
9) HydroSkrub is biodegradable, and in most instances may be purged down sewers. Check
with local authorities before disposing of any complex compositions
10) Turn off water, shut off the pump and immediately close discharge valves to prevent
backflow.
11) Completely drain pump bucket. Disconnect hoses from equipment and thoroughly rinse the
bucket, pump, and associated hoses used.
6.4.3 Testing HydroSkrub Effectiveness
There are two methods of testing the effectiveness of HydroSkrub during cleaning: the calcium
carbonate spot test of the circulating solution and the charting of a trend in the pH of the
cleaning solution.
6.4.4 Calcium Carbonate Spot Test:
A calcium carbonate spot test is performed by exposing a form of calcium carbonate to the
HydroSkrub solution. Samples of the deposit, a Tums or Rolaids tablet, or bare concrete can be
used. Observe the reaction of the HydroSkrub solution on the calcium carbonate. Foaming and
bubbling indicates the solution is still active. Little or no reaction indicates that the solution is
expended. This test should be performed near the end of the circulating time. If the solution has
been expended, more HydroSkrub will be required to complete the job. If the solution is still
active at the end of the time, all the scale has been dissolved.
6.4.5 pH Trend Charting:
The initial pH of the cleaning solution will measure between 1-3 (See pH sheet on HydroSkrub
packaging). To test the effectiveness of the circulating solution as a function of pH, take
readings at regular intervals and chart as a trend. Note that the deposits can cause a premature
jump in the pH. After circulating for approximately 75% of the cycle time, begin testing the pH at
10-15 minute intervals. Once the solution’s pH reads 6.0-7.0 on three or more consecutive
readings, the solution is expended. If the pH reads below 6.0 after the circulating time, the
application is clean.