Carrier 50BA User Manual
Page 6
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PILLOW BLOCK
FAN SHAFT
BEARING s
Fig. 11 — Concentric Alignment
VENTURI
LOCKING COLLAR
SHAFT
Fig. 12 - Fan Shaft Bearings
-008,012,016,024
Units 50BA,BB028 thru 064 — Bearings are bolted
to an angle support fastened to fan scroll, Fig. 13.
If shaft and wheels are concentrically misaligned:
1. Loosen bearing support bolts and shim or move
if necessary.
2. Retighten bearing support bolts.
SHAFT EXTENSION
LONGER ON
ONE END TO
ACCOMMODATE
DRIVE PULLY
BEARING LOCKING
COLLAR 2 SET SCREWS
HOLLOW SHAFT
3 FANS ON 054 8064
'
shim
IF NECESSARY
Fig. 13 — Horizontal Shaft Alignment
HORIZONTAL
SHAFT
ALIGNMENT
(ALL
UNITS) — If shaft has moved and all wheels are off
horizontal center, recenter the shaft. To correct.
1. Loosen setscrews holding bearing locking collar.
One on each end of shaft (Fig. 12 or 13).
2. Slide shaft and wheel assembly horizontally
until wheels are horizontally centered (Fig. 9).
3. Slide bearing locking collars against bearing
race; turn in direction of shaft rotation until
tight.
4. Retighten locking collar setscrews.
CUTOFF CLEARANCE (044, 054 and 064 Units
Only ) — After centering and aligning fan wheel,
loosen cutoff sheet, adjust for 1-1/4 in. clearance
(all sizes) and then tighten securely. See Fig. 11.
Evaporator Fan Adjustment
— Refer to Service
Section.
Field-Fabricated Ductwork
— Secure all ducts to
building structure. Use flexible duct connectors
between unit and ducts as required. Insulate and
weatherproof any external ductwork, joints and
openings with flashing and mastic in accordance
with applicable codes.
Ducts passing thru an unconditioned space
must be insulated and covered with a vapor barrier.
Return Air Filters
— Check that filters shipped in
unit are the correct size. Refer to Table 1. Do not
operate unit without return air filters in place.
Spring-Mounted
Compressors
(50BB008
and
50BA,BB012 thru 064)
— Held rigid in shipment
by 4 bolts which extend thru a washer, grommet,
and compressor foot into a weld nut (except on
064 unit). Loosen bolt until compressor floats free
on springs. Retighten bolts so there is a slight
pressure on the neoprene grommet. This will steady
compressor and prevent start and stop rocking.
The 50BA,BB064 units are shipped with 4
special flanged washers and neoprene grommets in
a cloth bag tied to the compressor.
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