Carrier 39S handleiding
Handleiding
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58
FANS
1. Check lubrication of fan, motor bearings, and linkages.
a. Note that bearings are shipped completely full of grease
for corrosion protection and may run warm temporarily
on start-up until excess grease has discharged.
b. Hand-operate all damper linkages to check for freedom
of movement.
2. Check tightness of bearing setscrews or locking collars. Also,
check tightness of setscrews on fan wheels and sheaves.
3. Check tightness of fan shaft bearing mounting.
4. Recheck sheave alignment and belt tension. (Refer to Fig. 47
and 48.)
5. Hand turn fan to make certain fan wheel does not rub in
housing.
6. Check fan speed with a strobe-type tachometer or use the fol-
lowing formula: Obtain the motor rpm from the fan motor
nameplate and read sheave pitch diameters marked on the fan
and motor pulleys, or estimate the pitch diameters by using
the pulley outside diameters.
Then:
Example:
Refer to the product data catalog for maximum allowable fan
speeds for standard wheels. Excessive fan speed may result in
condensate carryover from cooling coil or fan motor over-
load and wheel failure.
7. Check direction of rotation (see Fig. 75). Arrow on drive side
of fan housing indicates correct direction of rotation.
Fig. 75 — Fan Wheel Rotation
8. Check vibration. If excessive vibration occurs, check for the
following:
a. Variable sheave (if air balance of system has been
accomplished: replace sheave with fixed sheave for con-
tinuous application).
b. Drive misalignment.
c. Mismatched, worn or loose belts.
d. Wheel or sheaves loose on shaft.
e. Loose bearings.
f. Loose mounting bolts.
g. Motor out of balance.
h. Sheaves eccentric or out of balance.
i. Vibration isolators improperly adjusted.
j. Out-of-balance or corroded wheel (rebalance or replace
if necessary).
k. Accumulation of material on wheel (remove excess
material).
SERVICE
General
1. Place a suitable walkway to protect floor insulation whenever
entering the fan section.
2. Review Safety Considerations at beginning of these instruc-
tions. Good safety habits are important tools when perform-
ing service procedures.
3. To make speed measurements, use a strobe-style tachometer
or calculate per Step 6 of Start-Up, Check List.
Fan Motor Replacement
See Fig. 76-80 for typical motor wiring diagrams.
1. Shut off motor power.
2. Disconnect and tag power wires at motor terminals.
3. Loosen motor brace-to-mounting-rail attaching bolts. Loosen
belt tensioning bolts to adjust the motor position so V-belts
can be removed without stretching over grooves.
4. Mark belt as to position. Remove and set aside belts.
5. Remove motor to motor bracket holddown bolts.
6. Remove motor pulley and set aside.
7. Remove motor.
8. Install new motor. Reassemble by reversing Steps 1-6. Be
sure to reinstall multiple belts in their original position. Use a
complete new set if required. Do not stretch belts over
sheaves. Review the sections on motor and sheave installa-
tion, sheave alignment and belt tensioning discussed previ-
ously (Fig. 47-49).
9. Reconnect motor leads and restore power. Check fan for
proper rotation as described in Start-Up, Check List.
Fan Rpm =
Motor Rpm x Motor Sheave
Pitch Diameter (in.)
Fan Sheave Pitch Diameter (in.)
Actual Approximate
Nameplate Motor
Rpm = 1760 1760
Mtr Sheave Pitch
Diameter = 8.9 in. 9.0 in. (OD)
Fan Sheave Pitch
Diameter = 12.4 in. 12.5 (OD)
Fan RPM = 1760 x 8.9 1760 x 9.0
= 12.4 12.5
= 1263 rpm 1267 rpm
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Productinformatie
| Merk | Carrier |
| Model | 39S |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10967 MB |
