AAON RN Series Installation Operation & Maintenance page 81

to provide slip fit clearance when the wheel
is rotated by hand.
Confirm that the wheel rotates freely. Apply
power to the unit and confirm rotation.
Visually inspect the belt and ensure the belt
is tracking near the center of the rim. Verify
the wheel speed is approximately 45-50
RPM. Confirm there is no excessive noise
such as scraping, brushing, or banging.
Polymer Wheel Installation
Energy recovery cassettes are incorporated
within the design of packaged units,
packaged air handlers and energy recovery
ventilators. In each case, it is recommended
that the following
addressed:
Polymer Wheel Accessibility
The cassette and all its operative parts; i.e.:
motor, belt, pulley, bearings, seals and
energy transfer segments must be accessible
for service and maintenance. This design
requires that adequate clearance be provided
outside the enclosure. Where cassettes are
permanently installed in a cabinet, access to
both sides of the cassette must be provided.
Polymer Wheel Orientation & Support
The Energy Recovery Cassette may be
mounted in any orientation. However, Care
must be taken to make certain that the
cassette frame remains flat and the bearing
beams are not racked.
considerations be
Frame
A
Wheel
Bearing
beams
(2)
Flat surf ace
B
Avoid Racking of Cassette Frame
To verify, make certain that the distance
between wheel rim and bearing beam is the
same at each end of the bearing beam, to
within 1/4 of an inch (dimension A & B).
This amount of racking can be compensated
for by adjusting the diameter seals.
If greater than 1/4 inch (dimension C),
racking must be corrected to ensure that drive
belt will not disengage from wheel.
Polymer Wheel Startup Procedure
CAUTION
Keep hands away from rotating wheel!
Contact with rotating wheel can cause
physical injury.
1. By hand, turn wheel clockwise (as
viewed from the pulley side), to verify
wheel turns freely through 360º rotation.
2. Before applying power to drive motor,
confirm wheel segments are fully
engaged in wheel frame and segment
retainers are completely fastened. (See
Segment Installation Diagram).
3. With hands and objects away from
moving parts, activate unit and confirm
Bearing beams shown
racked
C
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