Inspecting and Cleaning Coils
Steam and Water Coils
Coils become externally fouled as a result of normal operation. Dirt on the coil surface reduces it’s 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
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
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.
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