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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.
Roofing
The cleaning procedures outlined here use
relatively benign ingredients. When working
with a rooftop unit care must be taken to
make sure the chemicals will not adversely
affect the roof coating. Checking with the
roofing supplier/manufacturer is the best way
to proceed. If the roofing
supplier/manufacturer is not available testing
of the chemicals on the roof coating is
recommended.
Commercial roofing material manufacturers
using PVC and EPDM have been contacted
and indicate that there should be no problem
with any of the procedures outlined above.
Options
(See back of the manual for maintenance log)
Heating Coils
One or two row hot water and steam heating
and preheating coils can be factory installed.
All valve controls for heating operation are
field supplied and field installed. Hot water
and steam coil connections are spun copper
tube.
Water coils must not be subjected to entering
air temperatures below 38°F to prevent coil
freeze-up. If air temperature across the coil is
going to be below this value, use a glycol
solution to match the coldest air expected.
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