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Maintenance
Refrigerant Coils
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
1. Disconnect all electrical power to the unit.
2. Wear the appropriate personal protective equipment
(PPE).
3. Access to the coil section of the unit (both sides).
4. Use a soft brush to remove loose debris from both
sides of the coil.
5. Mix a high quality coil cleaning detergent with water
according to the manufacturer's instructions. If the
detergent is strongly alkaline after mixing (pH 8.5 or
higher), it must contain an inhibitor. Carefully follow the
cleaning solution manufacturer's instructions regarding
product use.
6. Place the mixed solution in a garden pump-up sprayer
or high pressure sprayer. If using a high pressure
sprayer note the following:
•
Maintain a minimum nozzle spray angle of 15°
•
Spray perpendicular to the coil face
•
Protect other areas of the equipment and internal
controls from contact with moisture or the cleaning
solution
•
Keep the nozzle at least six inches from the coil
•
Do not exceed 600 psig
Draining the Waterside Economizer Coil
NOTICE
Coil Freeze-Up!
Failure to follow instruction below could result in
equipment damage.
Drain and vent coils when not in use. Trane
recommends glycol protection in all possible freezing
applications. Use a glycol approved for use with
commercial cooling and heating systems and copper
tube coils.
Drain plugs are in the piping below supply and return
header for each coil. Use these plugs to drain the coil and
piping. When draining the coil, open the vents at the top of
the supply and return headers. Also, a drain plug is at the
bottom of the inlet condenser manifold and in the outlet
pipe near the left side of the unit. Remove these plugs to
88
drain the condensers. Be sure to open the vent plugs at the
top of the condenser inlet and outlet manifold. See .
When refilling the condenser/waterside economizer coil
system with water, provide adequate water treatment to
prevent the formation of scale or corrosion.
Cleaning the Condenser
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.
Condensing water contains minerals that collect on the
condenser tube walls. Cooling towers also collect dust and
foreign materials that deposit in the condenser tube. The
formation of scale or sludge in the condenser is indicated
by a decreased water flow, low temperature difference
between inlet and outlet water, and abnormally high
condensing temperatures. To maintain maximum
condenser efficiency, the condenser must remain free of
built-up scale and sludge. Clean the condenser either
mechanically or chemically.
1. Disconnect all electrical power to the unit.
2. Wear appropriate personal protective equipment
(PPE).
3. Access both sides of the coil section.
4. Use a soft brush to remove loose debris from both
sides of the coil.
5. Use a steam cleaning machine, starting from the top of
the coil and working downward. Clean the leaving air
side of the coil first, then the entering air side. Use a
block-off to prevent steam from blowing through the coil
and into a dry section of the unit.
6. Repeat step 5 as necessary. Confirm that the drain line
is open following completion of the cleaning process.
7. Allow the unit to dry thoroughly before putting the
system back into service.
8. Straighten any coil fins that may be damaged with a fin
rake.
9. Replace all panels and parts and restore electrical
power to the unit.
10. Ensure that contaminated material does not contact
other areas of the equipment or building. Properly
dispose of all contaminated materials and cleaning
solutions.
SCXF-SVX01T-EN
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