94
CVHE-SVX005B-EN
Evaporator
Since the evaporator is typically part of a closed circuit,
it may not accumulate appreciable amounts of scale or
sludge. Normally, cleaning every three years is
sufficient. However, periodic inspection and cleaning is
recommended on open evaporator systems, such as air
washers.
Waterbox and Tubesheet Protective
Coatings
Trane recommends that coated waterboxes/tubesheets
—regardless of the type of protective coating included
—be taken out of service within the first one to three
months of operation for inspection. Any voids or
defects identified upon inspection must be repaired. If
the water quality is known to be highly supportive of
corrosion (i.e., sea water, etc.), inspect the coating
system at one month; if the water quality is known to
be relatively benign (i.e., normal treated and clean
condenser water), inspect the coating system within
three months. Only when initial inspections show no
problems are present should subsequent maintenance
intervals be increased.
Sacrificial Anodes
The replacement schedule for the optional zinc or
magnesium anodes can vary greatly with the
aggressiveness of the water that is in the system. Some
sites could require anode replacement every two to
three months while other sites may require anode
replacement every two to three years. Trane
recommends inspection of anodes for wear sometime
within the first several months of the anodes being
placed into service. If the observed loss of anode
material is small, then the interval between subsequent
inspections can be lengthened. Replace the anode and/
or shorten the inspection interval if the anode has lost
50 percent or more of its original mass. If anode
depletion occurs very quickly, consult a water
treatment specialist to determine if the anode material
selected is correct for the application.
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As needed after draining the waterbox, use a 2-1/2 in.
(63.5 mm) wrench to remove/install Trane-supplied
waterbox anodes.
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