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recovery wheel will restore latent
effectiveness to near original performance.
To clean, gain access to the energy recovery
wheel and remove segments. Brush foreign
material from the face of the wheel. Wash the
segments or small wheels in a 5% solution of
non-acid based coil cleaner or alkaline
detergent and warm water.
Soak in the solution until grease and tar
deposits are loosened (Note: some staining of
the desiccant may remain and is not harmful
to performance). Before removing, rapidly
run finger across surface of segment to
separate polymer strips for better cleaning
action. Rinse dirty solution from segment and
remove excess water before reinstalling in
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.
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.
Wheel Drive Components
The wheel drive motor bearings are pre-
lubricated and no further lubrication is
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. Annually
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.
Installation Considerations
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 considerations be
addressed:
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.
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.
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