66
(NaHCO) before the last rinse ensures that all
acid is neutralized.
E-Coated Coil Cleaning
Documented routine cleaning of e-coated
coils is required to maintain coating
warranty coverage for fin and tube and
microchannel coils. See the AAON
E-Coated Coil Maintenance Record sheet.
Surface loaded fibers or dirt must be
removed prior to water rinse to prevent
restriction of airflow. If unable to back wash
the side of the coil opposite of the coils
entering air side, then surface loaded fibers
or dirt must be removed with a vacuum
cleaner. If a vacuum cleaner is not available,
a soft non-metallic bristle brush may be
used. In either case, the tool must 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.
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 low velocity clean water rinse.
A monthly clean water rinse is
recommended for coils that are applied in
coastal or industrial environments to help to
remove chlorides, dirt, and debris. It is very
important when rinsing, that water
temperature is less than 130°F and pressure
is less than 100 psig to avoid damaging the
fin edges. An elevated water temperature
(not to exceed 130°F) will reduce surface
tension, increasing the ability to remove
chlorides and dirt.
Quarterly cleaning is essential to extend the
life of an e-coated coil and is required to
maintain coating warranty coverage.
Coil cleaning shall be part of the unit’s
regularly scheduled maintenance procedures.
Failure to clean an
e-coated coil will void the
warranty and may result in reduced
efficiency and durability.
For routine quarterly cleaning, first clean the
coil with the below approved coil cleaner.
After cleaning the coils with the approved
cleaning agent, use the approved chloride
remover to remove soluble salts and
revitalize the unit.
Harsh chemicals, household bleach,
or acid cleaners must not be used to
clean outdoor or indoor e-coated coils.
These cleaners can be very difficult to
rinse out of the coil and can accelerate
corrosion and attack the e-coating. If
there is dirt below the surface of the
coil, use the recommended coil
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