Recommended System Maintenance - Trane CVHE Installation, Operation And Maintenance Manual

Recommended System Maintenance

NOTICE:
Proper Water Treatment!
The use of untreated or improperly treated water in a
CenTraVac could result in scaling, erosion, corrosion,
algae or slime. It is recommended that the services of a
qualified water treatment specialist be engaged to
determine what water treatment, if any, is required.
Trane assumes no responsibility for equipment failures
which result from untreated or improperly treated
water, or saline or brackish water.
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 45. Typical chemical cleaning setup
pipe
connections
circulator
pump
1. Follow all instructions in
Installation, " p. 75 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.
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
CVHE-SVX02H-EN
shutoff
valves
cleaning
solution
"Waterbox Removal and
Recommended Maintenance
chemical mineral content) for a recommended
cleaning solution suitable for the job.
Note: A standard condenser water circuit is
composed solely of copper, cast iron, and steel.
NOTICE:
Unit Corrosion Damage!
Failure to follow proper procedures when using
corrosive chemicals to clean water side of unit could
result in corrosion damage to the unit and tubes. It is
recommended that the services of a qualified chemical
cleaning firm be used. Proper personal protective
equipment as recommended by the chemical
manufacturer should be used. Refer to the chemicals
MSDS sheet for proper safety procedures.
Important: 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
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 that anode
inspection for wear sometime within the first several
months of the anodes being placed into service. If the
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