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62 CLCH-IM-16A
Figure 50
Bearing Setscrew Alignment
Fan Bearing Lubrication
Note: Greases used should conform to NLGI No. 2 penetration.
Fan bearings should be lubricated with a lithium base
grease which conforms to NLGI Number 2 for
consistency. See
Table 49
and
Table 50
for
recommended lubricants and bearing grease
capacities.
CAUTION
Improper lubrication can result in
premature bearing failure.
Do not mix greases with different
bases within the bearing. This can
cause an audible squealing noise
that may be transmitted through
the system ductwork. Premature
bearing failure may result.
To lubricate the fan bearings, complete the following:
WARNING
Disconnect electrical power
source before servicing the unit. If
unit must be on for maintenance
procedures, exercise extreme cau-
tion. Failure to do so may result in
personal injury or death from elec-
trical shock or entanglement in
moving parts.
Disconnect electrical power prior
to access into a fan or ductwork.
Even when locked out electrically,
fans may cause injury or damage if
the impeller is subject to “wind-
milling.” The impeller should be
Set Screws (2)
Set Screws (2)
Table 49
Recommendations for Grease-Lubricated Fan Bearings
Greasing Intervals
Operating Conditions -20
°
F to +140
°
F 140
°
F to 200
°
F
Clean, Dry
3-6 months 1-3 months
Dirty, Dry
1-3 months 1-4 weeks
Dirty, Wet, High
Humid.
1-4 weeks 1-14 days
Recommended
Greases
Recommended Operating Range
Texaco-Multi Fak #2
-20
°
F to +250
°
F
Shell Alvania #2
-20
°
F to +250
°
F
Mobil Mobilux #2
-20
°
F to +250
°
F
Exxon Unirex #2
-20
°
F to +250
°
F
Texaco Prem. RB
-20
°
F to +250
°
F
Mobil 532
-20
°
F to +250
°
F
Exxon Beacon
-65
°
F to +250
°
Keystone 84H
-40
°
F to +225
°
F
Shaft Size (In)
Max. Grease Cap. of Bearing (Oz.)
1/2 to 3/4
1/8
7/8 to 1-3/16
3/8
1-1/4 to 1-1/2
5/8
1-11/16 to 1-15/16
7/8
2 to 2-7/16
1-1/4
2-1/2 to 2-15/16
2