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CVHE-SVU01E-EN
Maintenance
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.
1. Remove the retaining nuts and
bolts from the water box covers at
each end of the condenser. Use a
hoist to lift the covers off the water
box. (A threaded connection is
provided on each water box cover
to allow insertion of an eyebolt).
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 may be best removed
by chemical means. Be sure to
consult a 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.
Remember, a standard condenser
water circuit is composed solely of
copper, cast iron and steel.
CAUTION
Unit Corrosion Damage!
Proper procedures must be followed
when using corrosive chemicals to
clean water side of unit. 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.
Failure to follow proper procedures
could result in corrosion damage to
the unit and tubes.
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.
Cleaning the Evaporator
Since the evaporator is typically part
of a closed circuit, it does not
accumulate appreciable amounts of
scale or sludge. Normally, cleaning
every 3 years is sufficient. However,
on open CVHE, CVHF and CVHG
systems, such as air washers,
periodic inspection and cleaning is
recommended.
Control Settings and
Adjustments
Time delays and safety control cutout
settings need to be checked annually.
For control calibration and check-out,
contact a Trane qualified service
organization.