AERCO KC1000 Heater 2002 - Manual (Page 57)

MAINTENANCE
6-15
strength is depleted (two pounds of deposits removed per gallon used) or the equipment is free from
calcium and other water formed mineral deposits.
12. Periodically test the solution for effectiveness to determine if more HydroSkrub is needed—refer to
“Testing hydroSkrob Effectiveness” 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.
13. Upon completion, begin flushing procedure by adding water to the circulation bucket, then disconnect
return valve from the circulating bucket and thoroughly flush. Continue water flushing the equipment
for a minimum of 10 minutes or until discharge runs clear.
14. HydroSkrub is biodegradable, and in most instances may be purged down sewers. Check with local
authorities before disposing of any complex compositions.
15. Turn off water, unplug pump and immediately close discharge valves to prevent backflow.
16. Completely drain pump bucket. Disconnect hoses from equipment and liberally rinse bucket, pump,
and associated hosing before neatly stowing.
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.
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.
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.
6.10 CONDENSATE DRAIN ASSEMBLY
KC Heaters contain a condensate drain cup (Figure 2.5) which should be inspected and cleaned annually
to ensure proper operation.
To inspect and clean, proceed as follows:
1. Remove the left side panel and left rear cover to provide access to the condensate drain components
(see Figure 2.6).
2. Disconnect the drain hose attached to the exhaust manifold.
3. Disconnect the plastic tubing from the condensate cup drain tube to the drain
4. Remove the condensate cup from under the unit. Thoroughly clean the cup and inspect drain tube for
blockage.
5. Check to ensure that the condensate drain opening in the exhaust manifold is not blocked.
6. Flush out the drain hose and plastic tubing.
7. After the above items have been cleaned and inspected, reassemble the condensate drain
components by reversing the previous steps.