Adjusting Air Seals; Segment Installation And Replacement - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

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.
3. Using a folded piece of paper as a feeler gage, position the
paper between the wheel surface and the diameter seals.
4. Adjust the seals towards the wheel surface until a slight
friction on the feeler gage (paper) is detected when the
gage is moved along the length of the spoke.
5. Retighten the adjusting screws and recheck clearance with
the feeler gage.
HORIZONTAL
BEARING BEAM (2)
Fig. 184 — Lifting Hole Locations
Fig. 185 — Avoid Racking of Frame

SEGMENT INSTALLATION AND REPLACEMENT

Wheel segments are secured to the wheel frame by a segment
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retainer, which pivots on the wheel rim and is held in place by a
segment retaining catch (Fig. 187).
To install wheel segments follow the steps below and refer to
Fig. 187.
VERTICAL
BEARING BEAM (2)
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205
TO
REMOVE
DIAMETER SEAL
ADJUSTING SCREWS
Fig. 186 — Diameter Seal Adjustment
1. Unlock two segment retainers, one on each side of the
selected segment opening.
2. With the embedded stiffener facing the motor side, insert the
nose of the segment between the hub plates.
3. Holding segment by the two outer corners, press the segment
towards the center of the wheel and inwards against the
spoke flanges. If hand pressure does not fully seat the seg-
ment, insert the flat tip of a screw driver between the wheel
rim and the outer corners of the segment and apply down-
ward force while guiding the segment into place.
4. Close the latch each segment retainer under the segment re-
taining catch.
5. Slowly rotate the wheel 180 degrees. Install the second seg-
ment opposite the first for counterbalance. Rotate the two in-
stalled segments 90 degrees to balance the wheel while the
third segment is installed. Rotate the wheel 180 degrees
again to install the fourth segment opposite the third. Repeat
this sequence with the remaining four segments.
5
4
Fig. 187 — Segment Installation
ROTATION
TO
ADJUST
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FEELER
GAGE
1
4
3
2
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