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UNT-IOM-6 121
Coils become externally fouled as a result of normal operation. Dirt on
the coil surface reduces its heat transfer ability that can result in
comfort problems, increased airflow resistance, and thus increased
operating energy costs. If the coil surface dirt becomes wet, which
commonly occurs with cooling coils, microbial growth (mold) may
result and potentially cause unpleasant odors and health-related
indoor air quality problems.
Inspect coils at least every six months or more frequently as dictated
by operating experience. Required cleaning frequency depends on
the system operating hours, filter maintenance and efficiency, and dirt
load. The Trane Company recommends the following method of
cleaning coils:
1. Disconnect all electrical power to the unit.
2. Don the appropriate personal protective equipment (PPE).
3. Gain access to the both sides of the unit 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 have been damaged during the
cleaning process with a fin rake.
9. Replace all panels and parts and restore electrical power to the
unit.
10. Use caution to assure that any contaminated material does not
contact other areas of the unit or building. Properly dispose of all
contaminated materials and cleaning solution.
Inspecting and
Cleaning Coils
Steam and Water
Coils