4
LC IO&M
B51031-004
Start Up
Turn on the fan. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation
•
Excessive vibration
• Unusual noise
• Bearing noise
• Improper belt alignment or tension (listen for a continuous squeal-
ing noise)
• Improper motor amperage or voltage
NOTICE! If a problem is discovered, immediately shut
off the fan. Lock out all electrical power and check for
the cause of the trouble. Refer to Troubleshooting.
Inspection
Inspection of the fan should be conducted at the first
30
minute
,
8 hour
and
24 hour
intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as fol-
lows.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts. Adjust
and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan. The
frequency of inspection depends on the operating conditions
and location of the fan.
Inspect fans exhausting corrosive or contaminated air within
the first month of operation. Fans exhausting contaminated air
(airborne abrasives) should be inspected every three months.
Clean the wheel and air inlets if material build-up is exces
-
sive. Excessive build-up can cause imbalance and failure of
the wheel.
Regular inspections are recommended for fans exhausting
non-contaminated air.
It is recommended the following inspections be con-
ducted twice per year.
• Inspect bolts and setscrews for tightness. Tighten as necessary.
• Inspect belt wear and alignment. Replace worn belts with new belts
and adjust alignment as needed. See
Belt and Pulley Installation
,
page 2
• Bearings should be inspected as recommended in the
Conditions
Chart
•
Inspect for cleanliness. Clean exterior surfaces only. Removing
dust and grease on motor housing assures proper motor cooling
Conditions Chart
RPM
Temp °F
Greasing Interval
Up to 1000
-30 to 120
3 months
120 to 200
1 month
1000 to 3000
-30 to 120
6 weeks
120 to 200
2 weeks
Over 3000
-30 to 120
2 weeks
120 to 200
1 week
Any Speed
< -30
Consult Factory
Any Speed
> 200
1/2 week
For moist or otherwise contaminated installations, divide the
interval by a factor of three.
Fan Bearings
The fan bearings are provided prelubricated. Any special-
ized lubrication instructions on fan labels supersedes informa-
tion provided herein. Bearing grease is a petroleum lubricant
in a lithium base conforming to an NLGI #2 consistency. If
user desires to utilize another type of lubricant, they take re-
sponsibility for flushing bearings and lines and maintaining a
lubricant that is compatible with the installation.
An NLGI #2 grease is a light viscosity, low-torque, rust-in-
hibiting lubricant that is water resistant. Its temperature range
is from -30°F to 200°F and capable of intermittent highs of
250°F.
Bearings should be relubricated in accordance with the
Re-
lubrication Intervals
chart, below.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can damage seal
and reduce life through excess contamination and/or loss of
lubricant.
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
Motor Bearings
Motors are provided with prelubricated bearings. Any lubri-
cation instructions shown on the motor nameplate supersede
instructions below.
Direct Drive 1050/1075, 1200, 1300 and 1500
RPM units
use a prelubricated sleeve bearing that has an oil-saturated
wicking material surrounding it. The initial factory lubrication
is adequate for up to 10 years of operation under normal con
-
ditions. However, it is advisable to add lubricant after three
years. Use only LIGHT grade mineral oil or SAE 10W oil up
to 30 drops. If the unit has been stored for a year or more, it
is advisable to lubricate as directed above. For direct drive
units and other units in severe conditions, lubrication intervals
should be reduced to half.
Motors without sleeve bearings (as described above) will
have grease lubricated ball or roller bearings. Motor bearings
without provisions for relubrication will operate up to 10 years
under normal conditions with no maintenance. In severe ap-
plications, high temperatures or excessive contaminates, it is
advisable to have the maintenance department disassemble
and lubricate the bearings after three years of operation to
prevent interruption of service.
For motors with provisions for relubrication, follow intervals
of the table below.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to & including
184T
213T-365T
404T & larger
1800
RPM and
less
Over
1800
RPM
1800
RPM and
less
Over
1800
RPM
1800
RPM and
less
Over
1800
RPM
Standard
3 years
6 months
2 years
6 months
1 year
3 months
Severe
1 year
3 months
1 year
3 months
6 months
1 month
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with
a compatible grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.