AAON RN SERIES Installation Operation & Maintenance page 84

Documented routine
microchannel coils with factory provided e-
coating is required to maintain coating
warranty coverage. Use the E-Coated Coil
Cleaning section for details on cleaning e-
coated coils.
Field applied coil
recommended with microchannel coils.
Allowed Chemical
Procedures
AAON recommends certain chemicals that
can be used to remove buildup of grime and
debris on the surface of microchannel coils.
These chemicals have been tested for
performance and safety and are the only
chemicals that AAON will warrant as
correct for cleaning microchannel coils.
There are two procedures that are outlined
below that will clean the coils effectively
without damage to the coils. Use of any
other procedure or chemical may void the
warranty to the unit where the coil is
installed. With all procedures make sure
the unit is off before starting.
WARNING
WARNING
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
The water pressure used to clean should not
exceed 140 psi, from no closer than 6 inches
from the coils, and with the water aimed
perpendicular to the coils.
84
cleaning of
coatings are not
Cleaners and
#1 Simple Green
Simple Green is available from AAON Parts
and Supply (Part#
biodegradable with a neutral 6.5 pH.
Recommendation is to use it at a 4 to 1 mix.
Use the following procedure.
1. Rinse the coil completely with water.
Use a hard spray but be careful not to
bend or damage the fins. A spray that is
too hard will bend the fins. Spray from
the fan side of the coil.
2. With a pump sprayer filled with a mix of
4 parts water to one part Simple Green
spray the air inlet face of the coil. Be
sure to cover all areas of the face of the
coil.
3. Allow the coil to soak for 10-15 minutes.
4. Rinse the coil with water as in step one.
5. Repeat as necessary.
#2 Water Flush
This procedure can be used when the only
material to cause the coil to need cleaning is
debris from plant material that has impinged
the coil face.
1. Rinse the coil completely with water.
Use a hard spray but be careful not to
bend or damage the fins. A spray that is
too hard will bend the fins. Spray from
the fan side of the coil.
2. Spray and rinse the coil from the face.
CAUTION
Use pressurized clean water, with
pressure not to exceed 140 psi.
Nozzle should be 6" and 80° to 90°
from coil face. Failure to do so could
result in coil damage.
Application Examples
The two procedures can be used to clean
microchannel coils. They will fit with the
application depending on the area. In some
areas where the spring/summer has a large
cottonwood bloom #2 might work fine if the
unit is installed on an office building and no
other environmental factors apply.
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