AAON RL-240 - Manual (Page 40)

40
Startup
(See back of the manual for startup form)
Supply, Return, and Exhaust Backward
Curved Fans
RL Series units are equipped with direct
drive backward curved fan assemblies that
are selected to deliver the air volume
specified according to unit size and job
requirements. This is either done with air
volume bands in the blower wheels or with
VFDs. Field airflow adjustment may be
required at startup.
Air volume bands for the wheels are sized
according to the unit’s air delivery
specifications and can also be ordered from
the factory for field installation.
Airflow Adjustment
If reduced air volume is required an air
volume band or larger air volume band can
be installed within the blower wheel to
reduce the amount of air delivered by the
wheel.
If the unit is factory equipped with the air
volume band and additional air volume is
required, the band can be removed from the
wheel.
Use fan program in AAONEcat32
™
to
determine the new band size for the required
CFM and static pressure.
The following photos of a wheel are
provided for practical guidelines only in
order to identify the air band location in the
wheel. Actual field installation of the air
band into the wheel will require access into
and through the blower wheel venture,
which may require removal of the fan motor
and wheel.
Air volume bands are made of aluminum,
sized and equipped with easy bend tabs that
are to be inserted into pre-punched slots
provided on the wheel. Once the band has
been inserted into the slots, it MUST BE
secured by bending the tabs over from the
back side of the wheel and also MUST BE
secured from the inside by connecting the
ends together with a pop-rivet in the holes
provided on the ends of the band.
Figure 18 - Air Volume Band
If the band is field installed, a hand held
pop-rivet
tool is recommended for
connecting the band ends together. Caution
must be taken to assure that the band is
tightly installed and no damage, denting or
alteration to the wheel or blades occurs
during the installation.
Figure 19 - Air Volume Band Tab Locations