Coil Maintenance and Cleaning Recommendations  

Periodic cleaning of coil surfaces is essential to minimize contamination build-up and remove potentially harmful residue. 

Remove Surface-Loaded Fibers

Surface-loaded fibers or dirt should be removed with a vacuum cleaner.  If a vacuum cleaner is not available, a soft brush may be used.  In either case, the tool should be applied in the direction of the fins.  Coil surfaces can be easily damaged (fin edges bent over) if the tool is applied across the fins.  NOTE:  Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil.  This will make cleaning efforts more difficult.  Surface-loaded fibers must be completely removed prior to using a low velocity clean water rinse.

Periodic Clean Water Rinse

A periodic clean water rinse is very beneficial for coils that are applied in marine or industrial environments.  However, it is very important that the water rinse is made with a very low velocity water stream to avoid damaging the fin edges.


Harsh Chemical and Acid Cleaners

Harsh chemical or acid cleaners should not be used to clean outdoor or indoor coils.  These cleaners are very difficult to rinse out of the coil and will cause very rapid corrosion of aluminum fin collars where they are in contact with the copper tubes.  If there is dirt below the surface of the coil, use an automatic dishwasher detergent solution and then rinse with low velocity water stream.

 Precoated and Postcoated Coils

Chemical cleaners, including household bleach, should not be used on precoated or postcoated coils.  The procedure employing automatic dishwasher detergent outlined above is satisfactory for precoated coils.

 High Velocity Water or Compressed Air

High velocity water or compressed air should never be used to clean a coil.  The force of the water jet or compressed air will bend over the fin edges and high air-side pressure drop will result from the damage.