Aerovent IM-166 - Manual (Page 3)

Aerovent IM-166 3
Table 2. Relubricating Schedule (Months) — Ball Bearing Pillow Blocks
SPEED (RPM)
SHAFT DIA.
500 1000 1500 2000 2500 3000 3500 4000 4500
1 ⁄
2
"– 1 11 ⁄
16
" 6 6 5 3 3 2 2 2 1
1 15 ⁄
16
" – 2 7 ⁄
16
" 6 5 4 2 2 1 1 1 1
2 11 ⁄
16
" – 2 15 ⁄
16
" 5 4 3 2 1 1 1 — —
3 7 ⁄ 16 " – 3 15 ⁄ 16 " 4 3 2 1 1 1 — — —
conditions. See Table 2 for typical lubrication data.
However, every installation is different and the frequency
of relubrication should be adjusted accordingly.
On high moisture applications, the lubrication fre-
quency may need to be doubled or tripled to adequate-
ly protect the bearings. Double the relubrication fre-
quency on fans with vertical shafts.
Observation of the conditions of the grease expelled
from the bearings at the time of relubrication is the best
guide as to whether regreasing intervals and amount of
grease added should be altered.
Greases are made with different bases. There are
synthetic base greases, lithium base, sodium base, etc.
Avoid mixing greases with different bases. They could
be incompatible and result in rapid deterioration or
breakdown of the grease. The lubrication sticker identi-
fies a list of acceptable lubricants. All bearings are filled
with a lithium-based grease before leaving the factory.
When the fans are started, the bearings may discharge
excess grease through the seals for a short period of
time. Do not replace the initial discharge because leakage
will cease when the excess grease has worked out.
Sometimes the bearings have a tendency to run hotter
during this period. There is no reason for alarm unless
it lasts over 48 hours or gets very hot (over 200°F). When
relubricating, use a sufficient amount of grease to purge
the seals. Rotate bearings by hand during relubrication.
Wheel and Shaft Maintenance
Periodically inspect the shaft and wheel for dirt buildup,
corrosion, and signs of excess stress or fatigue. Clean
the components. If the wheel is removed for any reason,
make sure that it is securely attached to the shaft before
restarting the fan.
Structural Maintenance
All structural components or devices used to support or
attach the fan to a structure should be checked at
regular intervals. Vibration isolators, bolts, foundations,
etc., are all subject to failure from corrosion, erosion,
and other causes. Improper mounting can lead to poor
operation characteristics or fan fatigue and failure. Check
metallic components for corrosion, cracks, or other signs
of stress. Concrete should be checked to insure the
structural integrity of the foundation.
Operation Checklist
• Verify that proper safety precautions have been fol-
lowed.
• Electrical power must be locked off.
Check fan mechanism components:
• Nuts, bolts, setscrews are tight.
• Mounting connections are properly made and tight-
ened.
• Bearings are properly lubricated.
• Wheel, drives and fan surfaces are clean and tight-
ened.
• Rotating assembly turns freely and does not rub.
• Drives on correct shafts, properly aligned, and prop-
erly tensioned.
Check fan electrical components:
• Motor is wired for proper supply voltage.
• Motor was properly sized for power of rotating
assembly.
• Motor is properly grounded.
• All leads are properly insulated.
Trial “bump”:
• Turn on power just long enough to start assembly
rotating.
• Check rotation for agreement with rotation arrow.
• Listen for any unusual noise.
Run unit up to speed:
• Bearing temperatures are acceptable (<200°F) after
one to two hours of operation.
• Check for excess levels of vibration. Filter in read-
ings should be 0.15 inches per second or less.
After one week of operation:
• Check all nuts, bolts and setscrews and tighten if
necessary.
• Re-adjust drive tension if necessary.
Table 3. AMX Wheel-Funnel Overlap
B
A
C
Note: Use “B” dimension for positioning wheel.
SIZE 365 402 445 490 542 600 660 730
A 44.50 49.00 54.25 60.00 66.00 73.00 80.75 89.00
B 1.13 1.25 1.38 1.56 1.69 1.88 2.09 2.28
C 15.13 16.63 18.38 20.25 22.31 24.63 27.25 30.00
SIZE 150 165 182 200 222 245 270 300 330
A 18.25 20.00 22.25 24.50 27.00 30.00 33.00 36.50 40.25
B 0.56 0.63 0.69 0.75 0.88 0.97 1.06 0.94 1.03
C 6.19 6.75 7.56 8.31 9.13 10.19 11.19 12.38 13.63