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Note: Using a water stream, such as a garden hose,
against a surface loaded coil drives the debris
and dirt into the coil. This makes cleaning efforts
more difficult. Surface debris must be completely
removed prior to using low velocity clean water
rinse.
2. Perform Clean Water Rinse periodically - A monthly
clean water rinse is recommended for coils that are
applied in coastal or industrial environments to help to
remove chlorides, dirt and debris. It is very important to
get a thorough rinse to assure complete removal of
chlorides. Water temperature must be less than 130° F
and pressure not to exceed 900 psi to avoid damaging
the fin edges. An elevated water temperature (not to
exceed 130° F) will reduce surface tension, increasing
the ability to remove chlorides and dirt.
Notes:
1. Additional cleaning may be necessary
depending on the concentration of airborne
chemicals or debris. Cleaning with Coil
Cleaner or a ph neutral cleaning agent
diluted with tap water will help remove other
contaminates such as grease or oils that
require a detergent cleaner.
2. It is very important to get a thorough rinse to
assure complete removal of corrosives.
Using potable city (tap) water from a garden
hose is the recommended method to rinse
coils.
Flooded Shell and Tube Heat Exchanger
Cleaning Tasks
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist 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 tube fouling is suspect when the approach
temperature (i.e., the difference between the refrigerant
condensing temperature and the leaving condenser water
temperature) is higher than predicted. Standard water
applications will operate with less than a 9° F approach. If
the approach exceeds 9° F and there is non-condensable
in the system, cleaning the condenser tubes is
recommended.
Note: Glycol in the water system typically doubles the
standard approach. If the annual condenser tube
inspection indicates that the tubes are fouled, 2
cleaning methods can be used to rid the tubes of
contaminants.
Mechanical Cleaning Procedure
This method is used to remove sludge and loose material
from smooth-bore evaporator/condenser tubes.
1. Remove the retaining bolts from the water boxes (if
equipped) at each end of the evaporator and
condenser. Use a hoist to lift the water boxes.
2. Work a round nylon or brass bristled brush (attached to
a rod) in and out of each of the water tubes to loosen
the sludge.
3. Thoroughly flush the evaporator/condenser water tubes
with clean water (To clean internally enhanced tubes,
use a bi-directional brush or consult a qualified service
organization for recommendations).
Chemical Cleaning Procedure
Scale deposits are best removed by chemical means.
Consult a qualified water treatment specialist (one that
knows the local water supply chemical/mineral content) for
a recommended cleaning solution suitable for the job. (A
standard condenser water circuit is composed solely of
copper, cast iron and steel.)
Improper chemical cleaning can damage tube walls. 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.
Note: Chemical tube cleaning should always be followed
by mechanical tube cleaning.
Compressor Tasks
Compressor Removal
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
1. Isolate the compressor power.
2. Remove the Mains Input Cover.
3. Remove the AC mains cables from the compressor
terminals. Protect/Isolate cable ends.
4. Remove the Mains Input ground wire from the ground
post.
5. Remove the cable gland that secures the Mains Input
cable conduit to the Mains Input bracket.
6. Remove the Service Side Cover.
Maintenance Procedures
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