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Air
Discharge
Cutoff
Plate
Fan
Wheel
Fig. 24 — Fan Rotation
Fan Pulley Alignment
Align as follows:
1.
Loosen setscrews on pulleys.
2.
Align pulleys visually and tighten setscrews on fan pulley to
lock it in place.
3.
Use the methods shown in Fig. 25 to check proper pulley
alignment.
4.
If pulleys are not in correct alignment, loosen the motor hold-
down bolts and slide the motor axially until the pulleys are
aligned.
5.
Tighten motor holddown bolts.
Straight Edge Must
Be Parallel
With Belt
Pulleys
Setscrews
Single Groove
Motor and Fan Shafts
Must Be Parallel
Fig. 25 — Fan Pulley Adjustments
Fan
Housing
Adjustable Flanges
Setscrews
Fixed Flanges
Two Grooves
Pulley and Drive Adjustment
To obtain desired fan speed, refer to the fan motor, drive data
and performance data in Tables 16-40 and adjust fan motor
pulley as follows:
1.
Remove belt from fan motor pulley after loosening motor
from motor base.
2.
Loosen setscrew in moveable flange of pulley. Screw move-
able flange toward fixed flange to increase the fan speed and
away from fixed flange to reduce speed. Before tightening
setscrew, make certain that setscrew is over nearest flat sur-
face of pulley hub. (See Fig. 25.)
UNIT OPERATION HAZARD
Failure to follow this caution could cause equipment damage.
Increasing fan speed produces a greater load on motor.
Do not exceed rated capacity of motor.
Condensate Drains
Keep condensate drains free of dirt and foreign matter.
Return-Air Filters
Refer to Replacing Filters section on page 38 for filter
accessibility and removal. Replace with clean filters of the
sizes listed in Tables 1-6.
Coil Removal
Remove unit panels and corner posts as required. Disconnect
coil connections and remove fastening screws. Remove coil
through end or side sections of unit.
Cleaning Cooling Coil
Remove return-air filters. Remove any heavy dirt that may
have accumulated on underside of coil. Coil can be cleaned
more easily with a stiff brush, vacuum cleaner, or compressed
air when coil is dry. If coil is wet or if water is to be used for
cleaning, guard against splashing water on electrical compo-
nents or damaging surrounding area. Clean coil baffles as ap-
plicable and check for tight fit to be sure air does not bypass
coil.
Cleaning Insulation
The insulation contains an immobilized antimicrobial agent
that helps prevent the growth of bacteria and fungi. Clean the
inner surface of the insulation according to the separate main-
tenance instructions shipped with the unit.
26
CAUTION
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