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Packaged and Split Rooftop Ventilator
Energy Wheel Maintenance (MPE and MPF)
Inspection
The wheel should be inspected semiannually in
accordance with the maintenance
schedule. Maintenance of the
wheel consists mainly of
inspecting the wheel for
cleanliness and then checking
the drive motor, belt, and pulley
for wear. If the wheel layers
appear dirty, the wheel should
be disassembled and cleaned.
The wheel rotates through the
two airstreams which are moving
in opposite directions, the wheel is
self-cleaning, up to a point. If the
wheel media becomes blocked by
dirt or dust, or if the media collects a layer of smoke
residue or an oily lm, the energy transfer efciency
drops.
The main factor in the frequency of cleaning is the
cleanliness of the air. If air lters are not changed
frequently, the wheel will collect contaminants and will
then have to be cleaned.
Wheel Disassembly
Wheels are part of a cassette that may be pulled from
the unit for easy access. There may be a small damper
assembly or other component that blocks removal of the
cassette. Before sliding out the cassette or any other
component, disconnect any power supply cord and
secure it so it cannot jam or otherwise get damaged.
Each wheel has removable segments that hold the
coated layers of media and each segment is held in
place with two retaining clips located on the outer rim of
the wheel. When removing
more than one segment,
remove them in sequence
from opposite sides of the
wheel (180 degrees apart)
to reduce the imbalance.
Secure the wheel against rotation. Carefully release
the two retaining clips and swing them fully open. The
segment can now be removed by pushing the face
of the segment close to the outer rim of the wheel.
Wheel segments are built to close tolerances and the
segment may have to be jiggled to remove it. Do not
use a hammer or otherwise force the segment because
these are high value items and are not built to withstand
abuse.
Whenever retaining clips are opened, they should be
closed as soon as possible. If the wheel should rotate
when a clip is open, the clip will jam against the bearing
support bar and could cause damage.
Cleaning
Maintenance or cleaning of the wheel segments
should be done with the segments removed from
the wheel cassette to avoid splashing liquids or
cleaning agents inside the cabinet. If the energy wheel
appears excessively dirty, it should be cleaned to
ensure maximum operating efciency. Only excessive
buildup of foreign materials needs to be removed.
DISCOLORATION AND STAINING OF ENERGY
RECOVERY WHEEL DOES NOT AFFECT ITS
PERFORMANCE.
Thoroughly spray the wheel matrix with a household
cleaner such as Fantastik™ or the equivalent. Gently
rinse with warm water and use a soft brush to remove
any heavy accumulations. A detergent/water solution
can also be used. Avoid aggressive organic solvents,
such as acetone. Wheel segments can be soaked in the
above solution overnight for removal of stubborn dirt or
accumulations.
After cleaning is complete, shake excess water from the
wheel or segments. Dry the wheel or segments before
putting them back into the cassette.
Reassembly
When reinstalling the segments, be sure to install
them with the correct face toward the motor side of the
cassette. Note that one face of each segment is smooth
and the other face has a reinforcing channel or support
cut into the surface.
Segment Retaining Clip
Wheel Segment
(Motor Side)
Energy Wheel
Cassette
Wheel Segment
(Pulley Side)
Energy Recovery Wheel Belt
Inspect belts each time lters are replaced. Belts that
look chewed up or are leaving belt dust near the motor
pulley may indicate a problem with the wheel. Be sure to
inspect wheel for smooth and unrestricted rotation. If a
belt requires replacement, contact the local manufacturer
representative. Instructions for replacement will ship with
the new belt.
Energy Recovery Wheel Bearing
In the unlikely event that a wheel bearing fails, the
bearing is behind a removable plate on the wheel
support beam (slide cassette halfway out of cabinet to
access). Contact the local manufacturer representative
for detailed instructions on how to replace the bearing.
WARNING
Whenever performing maintenance or inspections,
always disconnect the power source.
© 2017 Mitsubishi Electric US, Inc.
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