Form O-Y P/N 273647R5, Page 29
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Clean the Wheel Segments
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Gently brush off any loose dirt and dust.
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To wash the segments, use a non-acid based
(evaporator) coil cleaner or alkaline detergent
solution. Non-acid based coil cleaner concentrate
in a 5% solution is recommended by the
manufacturer. Do not use any of the following as
they may cause damage to the wheel.
DO NOT use an acid based cleaner.
DO NOT use aromatic solvents.
DO NOT use temperatures in excess of 170°F.
DO NOT use a pressure washer.
DO NOT use steam.
Soak the segments in the cleaning solution
until grease and tar deposits are loosened. An
overnight soak may be required to adequately
loosen heavy deposits of oil based contaminants.
CAUTION
DO NOT use acid based cleaner, aromatic
solvent, steam, temperatures in excess of 170°F,
or a pressure washer, as damage to the wheel
may occur
.
Rinse the dirty solution from each segment until the
water runs clear.
NOTE:
Some staining of the desiccant
may remain and is not harmful to performance. Allow
excess water to drain from the segments before
reinstalling them in the wheel. (
NOTE
: A small amount
of water will dry out in the airflow.)
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Replace or Re-install Clean Wheel Segments
(from pulley side of wheel)
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Remove any dirt or dust from the wheel frame
and cassette and the slide-in area of the cabinet.
WARNING
Weight of the installed segments will cause the
wheel to accelerate in rotation. Failure to maintain
control of the wheel rotation while re-installing
all segments could cause severe injury to fingers
or hand caught between revolving spokes and
the bearing support beam. Insert the handle of
a hammer or other such tool through the spokes
above or below the bearing support as a stop to
limit rotation of an unbalanced wheel.
a) Position one segment opening at the top of the
cassette. Insert a “stop” (see warning above)
to hold the wheel in place. Unlock and open
the segment retaining brackets on both sides
of the opening. Position a clean segment with
the imbedded stiffeners toward the motor side
of the wheel. Holding the segment as vertically
as possible and centered between the spokes,
insert the nose of the segment downward
between the hub plates. Ease the segment
down until its outer rim clears the inside of the
wheel rim and press it inward against the spoke
flanges. Close and latch the retaining brackets.
Make sure each retaining bracket is fully
engaged under the catch.
b) Remove the stop and slowly rotate the installed
segment to the bottom of the wheel. Re-insert
the stop and repeat the procedure to put a
segment in the top position. Continue the
procedure, balancing the wheel by installing
opposite segments, until all of the segments are
in place.
c) While the wheel cassette is out, follow the
instructions below to check the seals and the
drive components.
d) After all wheel maintenance is complete, slide
the casette back into the cabinet. Re-connect the
motor wire. Being sure the cassette is positioned
properly, replace the center post.
Checking the Wheel Seals -
The seals are on the center support that goes across
the diameter of the wheel. There are two seals on each side of the wheel with one
seal on each side of the hub. Seals are metal strips with insulation on the surface
closest to the wheel. The purpose of the seals is to minimize the transfer of air
between the counter flowing airstreams.
After any wheel service and during maintenance, check the seal adjustment. Adjust-
ing the seals will require a screwdriver and a piece of paper.
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If the wheel has not been removed from the cabinet, turn off power to the unit,
lock the disconnect switch open and slide the wheel out of the cabinet.
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Each seal strip has adjustable retaining screws that allow the insulation to move
toward or away from the wheel. Refer to the illustration below, and follow the
instructions below to adjust the seals.
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On one seal, loosen the seal retaining screws just enough to slide the
seal strip.
4.2 Energy Recovery Wheel, Option EW (cont'd)
Checking the Seals
