Carrier 50BK - Manual (Page 9)

Table 2 — Setscrew Torque Requirements
A VsfmCAL DfSC^íARS£
BOLT SIZE 1 RECOMMENDED
(in.) TORQUE (Ib-ft)
% 1 15-18
Vs 1 22-25
Fig. 9 — Wire Tie Locations
W H E E L
#
VENTURI
7SCROLL
DIMENSION " d "
MUST BE EQUAL ALL AROUND
Fig. 10 — Horizontal Wheel Centering
Adjust as follows:
Units 50BJ,BK0I6 and 024
1. Loosen setscrews holding wheel support to shaft
(Fig. 11).
2. Center the wheel by sliding it horizontally
(Fig. 10).
3. Retighten setscrews.
Units 50BJ,B1C028,034,044,054 and 064
1. Loosen fan wheel square head setscrews on each
side of fan support (Fig. 11).
2. Center wheel by sliding it horizontally (Fig. 10).
3. Retighten locking setscrews to torque specified
in Table 2.
CONCENTRIC ALIGNMENT—Shaft and wheels
must be concentrically centered with the venturi or
air inlet of the fan housing.
ALL UNIT SIZES — Bearings are bolted to sup­
ports.
To correct shaft and wheel concentric
misalignment:
1. Loosen bearing support bolts and shim or move
as required.
2. Retighten bearing support bolts,
HORIZONTAL SHAFT ALIGNMENT (All
Units) — If the shaft has moved and all wheels are
off horizontal center, recenter the shaft as follows:
1. Loosen setscrews holding bearing locking collar
at each end of shaft.
2. Slide shaft and wheel assembly horizontally until
wheels are horizontally centered (Fig. 10).
3. Slide the bearing locking collars against the
bearing race; turn in direction of shaft rotation
until tight.
4. Retighten locking collar setscrews.
FAN, PULLEY AND BELT ADJUSTMENT —
Refer to the Service section entitled Indoor-Air
Fan Adjustment.
Step 9 — Install Field-Fabricated Ductwork
Connect ducts to unit, using flexible connections
as required. Duct angles are supplied with each
50BJ,BK044,054 and 064 unit. Install duct angles
at duct openings using flexible connections. Connect
supply ducts to flanges. Supply ducts should not be
manifolded together for at least 4 feet.
Attach ductwork to building structure and in­
sulate. Add a vapor barrier to prevent sound trans­
mission and vapor condensation.