Inspecting And Cleaning Coils; Hot Water Coils - Trane SCWM Series Installation, Operation And Maintenance Manual

Maintenance
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. For variable frequency drives or other energy
storing components provided by Trane or others, refer to
the appropriate manufacturer's literature for allowable
waiting periods for discharge of capacitors. Verify with a
CAT III or IV voltmeter rated per NFPA 70E that all
capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN.
NOTICE
Coil Damage!
Failure to follow instructions below could result in coil
damage.
Do not clean the refrigerant coil with hot water or
steam as it could cause high pressure inside the coil
tubing.
Do not use acidic chemical coil cleaners. Also, do not
use alkaline chemical coil cleaners with a pH value
greater then 8.5 (after mixing) without using an
aluminum corrosion inhibitor in the cleaning
• Keep coils clean to maintain maximum performance.
For operation at its highest efficiency, clean the
refrigerant coil often during periods of high cooling
demand or when dirty conditions prevail. Clean the coil
a minimum of once per year to prevent dirt buildup in
the coil fins, where it may not be visible.
• Remove large debris from the coils and straighten fins
before cleaning. Remove filters before cleaning.
• Clean refrigerant coils with cold water and detergent,
or with one of the commercially available chemical coil
cleaners. Rinse coils thoroughly after cleaning.
• Economizer and evaporator coils are installed so the
evaporator is directly behind the economizer. To clean
between the coils, remove the sheet metal block off.
Access the block off by removing the corner panels on
the left or right rear side of the unit.
• If the refrigerant coil is installed back to back with the
waterside economizer coil, use a cleaner that is
acceptable for cleaning both types of coils.

Inspecting and Cleaning Coils

Coils become externally fouled as a result of normal
operation. Coil surface dirt reduces heat transfer ability
66
and can cause comfort problems, increased airflow
resistance and thus increased operating energy costs.
Inspect coils at least every six months or more frequently
as dictated by operating experience. Cleaning frequently
is dependent upon system operating hours, filter
maintenance, efficiency, and dirt load. Following is the
suggested method for cleaning steam and hot water coils.

Hot Water 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. For variable frequency drives or other energy
storing components provided by Trane or others, refer to
the appropriate manufacturer's literature for allowable
waiting periods for discharge of capacitors. Verify with a
CAT III or IV voltmeter rated per NFPA 70E that all
capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN.
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.
PKG-SVX027A-EN