CVHH-SVX001G-EN
109
Recommended System
Maintenance
N
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Condenser
Condenser tube fouling is indicated when the approach
temperature (the difference between the condensing
refrigerant temperature and the leaving condenser
water temperature) is higher than predicted.
If the annual condenser tube inspection indicates that
the tubes are fouled, two cleaning methods—
mechanical and chemical—can be used to rid the tubes
of contaminants. Use the mechanical cleaning method
to remove sludge and loose material from smooth-bore
tubes.
To clean other types of tubes including internally-
enhanced types, consult a qualified service
organization for recommendations.
Figure 63.
Typical chemical cleaning setup
Pipe
Connections
Shutoff
Valves
Cleaning
Solution
Circulator
Pump
1. Follow all instructions in
to remove waterbox covers.
2. Work a round nylon or brass bristled brush
(attached to a rod) in and out of each of the
condenser water tubes to loosen the sludge.
3. Thoroughly flush the condenser water tubes with
clean water.
4. Scale deposits are best removed by chemical
means. Be sure to consult any qualified chemical
house in the area (one familiar with the local water
supply’s chemical mineral content) for a
recommended cleaning solution suitable for the
job.
N
No
otte
e:: A standard condenser water circuit is
composed solely of copper, cast iron, and
steel.
N
NO
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w iin
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an
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ub
be
ess..
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niitt.. IIff u
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IIm
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ntt:: All of the materials used in the external
circulation system, the quantity of the
solution, the duration of the cleaning
period, and any required safety precautions
should be approved by the company
furnishing the materials or performing the
cleaning. Remember, however, that
whenever the chemical tube cleaning
method is used, it must be followed up
with mechanical tube cleaning, flushing,
and inspection.
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
Summary of Contents for CVHH CenTraVac
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