17. Install the new blower wheel with the d-shaped
collar onto the motor shaft by aligning the d-
shaped flat sides of each. See Figure 12. Slide the
blower wheel onto the motor shaft until the blower
wheel rests against the shoulder on the motor shaft.
Secure the blower wheel with the wingnut. Make
sure the wheel turns freely.
18. Install the blower scroll over the wheel into the
larger end of the keyholes on the blower scroll plate. Turn the scroll to
the right to lock it on. Pull the black lever clip closest to you toward
the front of the unit. See Figure 13.
19. Separate one piece of the air sample tubing from the filter and connect
it to the hose barb located on the blower plate (Figure 13).
11Preventive Maintenance Kit 2270105
Installation - Release 5,
Series II (continued)
Figure 12. D-shape
Figure 13. Two Scroll Configurations Seen from Underside of Chamber Ceiling
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