38
Packaged and Split Rooftop Ventilator
© 2021 Mitsubishi Electric US, Inc.
Premi
Sys
Maintenance
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
appears dirty, the wheel should be
disassembled and cleaned.
The wheel rotates through two
airstreams moving in opposite
directions, which means 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 film,
the energy transfer efficiency drops.
The main factor in the frequency of cleaning is the
cleanliness of the air. If air filters 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 efficiency. 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.
Wheel Belt
Inspect belts each time filters 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.
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's representative
for detailed instructions on how to replace the bearing.
Segment Retaining Clip
Energy Wheel
Cassette
Wheel Segment
(Motor Side)
Wheel Segment
(Pulley Side)
WARNING
Whenever performing maintenance or inspections,
always disconnect the power source.
Optional Polymer Energy Wheel
