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To clean removable segments of the wheel (sizes 36-104):
1.
Access the wheel from the exhaust fan side. This may be
easiest from the adjoining section, depending on the type
of section installed. If it is necessary to access from the
side of the wheel section, remove side panel as shown in
Fig. 182.
2.
Unlock two segment retainers, one on each side of the
selected segment opening.
3.
Use the tip of a flat screw driver to pop the segment out of
the wheel. Repeat for each segment.
4.
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 (such as Acti-Klean) or an alkaline
detergent and warm water.
5.
Soak the segments in the solution until grease and tar
deposits are loosened. (NOTE: Some staining of the desic-
cant may remain and is not harmful to performance.) For
better cleaning action, rapidly run a finger across the seg-
ment's surface to separate polymer strips.
6.
Rinse dirty solution from segments and remove excess
water before reinstalling the segments in the wheel.
7.
Replace the segments using the Segment Installation and
Replacement procedure on page 214.
To clean wheels (size 25 and 30) use this procedure and refer to
Fig. 183:
1.
Remove the ERV section side access panel.
2.
Remove the upper and lower wheel center partition plates
(1). This requires removing screws (a) of the upper and
lower plate.
3.
Remove the upper and lower (2) wheel retainer angles,
being careful wheel does not tip and fall out.
4.
Slide wheel cassette out of frame (toward main AHU), and
out the side of the unit (3).
5.
Follow Steps 2 through 4 of the cleaning procedure for
removable segments.
6.
Reinstall the wheel into the section by reversing Steps 1-5.
CASSETTE REPLACEMENT
1.
Inspect the replacement cassette for freight damage upon
receipt. Inspect the cassette frame, wheel assembly and
segments for damage and verify that the wheel turns freely
by hand (clockwise when viewed from pulley side).
Report any damage immediately to the freight company.
2.
Handle ERV cassettes with care. Lift by the bearing sup-
port beam. Holes are provided on both sides of the bearing
support beams to facilitate rigging (Fig. 184).
3.
Remove the ERV section side access panel.
4.
Refer to Fig. 183. Remove the upper and lower wheel cen-
ter partition plates. This requires removing screws (a) of
the upper and lower plate.
5.
Remove the upper and lower (2) wheel retainer angles,
being careful wheel does not tip and fall out.
6.
Slide wheel cassette out of frame (toward main AHU), and
out the side of the unit (3).
7.
The new ERV section may be mounted in any orientation.
However, make certain that the frame remains flat and the
bearing beams are not racked as shown in Fig. 185.
8.
To ensure that the beams are not racked, check that the dis-
tance between the wheel rim and bearing beam is the same
at each end of the bearing beam, to within 1/4 of an inch
(dimension A and B in Fig. 185). Bearing beam racking of
as little as 0.040 inches (Dim C in Fig. 185) will cause the
wheel to tilt 3/16 in. at the rim. Adjusting the diameter
seals (Fig. 186) will compensate for up to 1/4 in. of rack-
ing.
NOTE: If racking is greater than 1/4 in., it must be corrected to
ensure that the drive belt will not disengage from the wheel.
9.
Wheel sections installed at angles greater than 30 degrees
from vertical will require seal adjustment (Fig. 186).
Adjust the diameter seals to avoid excessive wheel drag. A
final check of seal adjustment is recommended for all
designs.
a39-4386
Fig. 182 — Remove Side Baffles
a
3
2
Fig. 183 — Remove Wheel for Cleaning
(Wheel Sizes 25 and 30 Only)
ADJUSTING AIR SEALS
Four adjustable diameter seals are provided on each cassette to
minimize air transfer between the counterflowing airstreams.
To adjust diameter seals:
1.
Loosen the diameter seal adjusting screws and back seals
away from wheel surface (Fig. 186).
2.
Rotate the wheel clockwise until two opposing spokes are
hidden behind the bearing support beam.
213
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a39-4387
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