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
condenser 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.
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.
E-Coated Coil Cleaning
Documented routine cleaning of e-coated
coils is required to maintain coating warranty
coverage for condenser coils. E-Coated Coil
Maintenance Record sheet is provided in this
document.
Remove surface loaded fibers or dirt 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
remove surface loaded fibers or dirt 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, dirt and salts 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 39.5°C (130°F) and pressure is less than
689.5 kPa (100 psi) to avoid damaging the fin
edges. An elevated water temperature (not to
exceed 39.5°C [130°F]) will reduce surface
tension, increasing the ability to remove
chlorides and dirt.
High velocity water from a pressure
washer or compressed air must only
be used at a very low pressure to
prevent fin and/or coil damages. The
force of the water or air jet may bend
the fin edges and increase airside
pressure drop. Reduced unit
performance
or nuisance unit
shutdowns may occur.
ELECTRIC SHOCK
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
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