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Fan Rotation
Correct fan rotation with respect to fan outlet is shown in
Fig. 24.
To reverse the direction of rotation of a 3-phase fan motor,
reverse any 2 of the power leads. Refer to the connection
diagram on the inside of motor terminal box cover for proper
reversing procedure of a single-phase motor.
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.
Straight Edge Must
Be Parallel
With Belt
Pulleys
Setscrews
Single Groove
Motor and Fan Shafts
Must Be Parallel
Fig. 25 — Fan Pulley Adjustments
26
Fan
Housing
Adjustable Flanges
Setscrews
Fixed Flanges
Two Grooves
Specifications subject to change without notice.
4. If pulleys are not in correct alignment, loosen the motor
holddown bolts and slide the motor axially until the
pulleys are aligned.
5. Tighten motor holddown bolts.
Pulley and Drive Adjustment
To obtain desired fan speed, refer to the fan motor, drive
data and performance data in Tables 16-38 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
moveable 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 surface of pulley hub. (See Fig. 25.)
CAUTION
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 37 for filter
accessibility and removal. Replace with clean filters of the
sizes listed in Tables 1-4.
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 com-
pressed air when coil is dry. If coil is wet or if water is to be
used for cleaning, guard against splashing water on electri-
cal components or damaging surrounding area. Clean coil
baffles as applicable 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
maintenance instructions shipped with the unit.
FAS-FHS-072-180-01SI Rev. A
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