AAON RN Series Installation Operation & Maintenance page 87

Polymer Wheel Routine Maintenance and
Handling
Handle cassettes with care. Lift all cassettes
by the bearing support beam. Holes are
provided on both sides of the bearing support
beams to facilitate rigging as shown in the
following illustration.
Lifting Hole Locations
Routine maintenance of the Energy Recovery
Cassettes includes periodic cleaning of the
Energy Recovery Wheel as well as inspection
of the Air Seals
Components as follows:
Polymer Wheel Air Seals
Four adjustable diameter seals are provided
on each cassette to minimize transfer of air
between the counter flowing airstreams.
To adjust diameter seals, loosen diameter seal
adjusting screws and back seals away from
wheel surface. Rotate wheel clockwise until
two opposing spokes are hidden behind the
bearing support beam. Using a folded piece
of paper as a feeler gauge, position paper
between the wheel surface and diameter
seals.
and Wheel Drive
Adjust seals towards wheel surface until a
slight friction on the feeler gauge (paper) is
detected when gauge is moved along the
length of the spoke. Retighten adjusting
screws and recheck clearance with "feeler"
gauge.
Polymer Wheel Drive Components
The wheel drive motor bearings are pre-
lubricated and no further lubrication
necessary.
The wheel drive pulley is secured to the drive
motor shaft by a combination of either a key
or D slot and set screw.
The set screw is secured with removable
locktite to prevent loosening.
confirm set screw is secure. The wheel drive
belt is a urethane stretch belt designed to
provide constant tension through the life of
the belt. No adjustment is required. Inspect
the drive belt annually for proper tracking
and tension. A properly tensioned belt will
turn the wheel immediately after power is
applied with no visible slippage during start-
up.
Polymer Wheel Service
CAUTION
Disconnect electrical power before
servicing energy recovery cassette.
Always keep hands
bearing support beam when installing
or removing segments. Failure to do
so could result in severe injury to
fingers or hand.
Polymer Wheel Segment Installation &
Replacement
An uneven number of segments in the wheel
will cause the wheel to accelerate in rotation.
Minimize wheel imbalance and unwanted
rotation during service by installing
is
Annually
away from
or
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