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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 coatings are not
recommended with microchannel coils.
Allowed Chemical Cleaners and 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.
The water pressure used to clean must not
exceed 689.5 kPa (100 psi), from no closer
than 15.25 centimeters (6 inches) from the
coils, and with the water aimed perpendicular
to the coils.
#1 Simple Green
Simple Green is available from AAON Parts
and Supply (Part# T10701) and is
biodegradable with a neutral 6.5 pH A 4 to 1
solution is recommended. 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.
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.
Electric shock hazard. Shut o
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
Use pressurized clean
pressure not to exceed 689.5 kPa
(100 psi). Nozzle must be 15.25 cm
(6”) and perpendicular to the coil face.
Failure to do so could result in coil
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