Filter Replacement - AAON WH Series Installation Operation & Maintenance

2. With a pump sprayer filled with a mix of
4 parts water to 1 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.
This procedure can be used when the only
#2 Water Flush
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.
Use pressurized clean water, with
pressure not to exceed 140 psi.
Nozzle must 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.
Generally the best and broadest based
procedure is #1. The grease cutting effect of
the Simple Green is good for restaurant
applications.
Other Coil Cleaners
There are many cleaners on the market for
coils. Before using any cleaner that is not
covered in this section, you must get written
approval from the AAON warranty and
service department. Use of unapproved
chemicals will void the warranty.
Caution
AAON testing has determined that unless a
chemical has a neutral pH (6-8) it must not
be used.
Beware of any product that claims to be a
foaming cleaner. The foam that is generated
is caused by a chemical reaction to the
aluminum fin material on tube and fin coils
and with the fin, tube, and coating material
on microchannel coils.
Microchannel coils are robust in many ways,
but like any component they must be treated
correctly. This includes cleaning the coils
correctly to give optimal performance over
many years.

Filter Replacement

Monthly filter inspection is required to
maintain optimum unit efficiency. It is
strongly recommended that filter media be
replaced monthly.
WARNING
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
See Filter Information section for reference
to the correct size and quantity of filters.
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