Supply Fans; Microchannel Coil Cleaning - AAON WH Series Installation Operation & Maintenance

Supply Fans

CAUTION
Blower wheels must be inspected for
excessive dust build up periodically
and cleaned if required. Excessive
dust build up on blower wheels may
cause an unbalanced state; leading
to vibration and/or component failure.
Damages due to excessive dust build
up will not be covered under factory
warranty.
WARNING
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
Supply Fan Lubrication
Supply fan motors
lubricated and require no oiling.

Microchannel Coil Cleaning

WSHP units include microchannel coils.
Cleaning microchannel coils is necessary in
all locations. In some locations it may be
necessary to clean the coils more or less
often than recommended. In general, a
WSHP coil must be cleaned at a minimum
of once a year. In locations where there is
commonly debris or a condition that causes
dirt/grease build up, it may be necessary to
clean the coils more often. Proper procedure
must be followed at every cleaning interval.
Using improper cleaning technique or
incorrect chemicals may result in coil
damage, system performance fall off, and
potentially leaks requiring coil replacement.
50
are permanently
Field applied coil
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.
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 must not
exceed 140 psi, from no closer than 3 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#
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.
coatings are not
T10701) and is