Greenheck TBI-FS/TBI-CA/TDI (460983) - Manual (Page 6)

Maintenance
Once the fan has been put into operation, a periodic
maintenance program should be set up to preserve the
reliability and performance of the fan.
Items to be included in this program are:
• Fasteners and set screws
• Bearings
• Lubrication of bearings and motor
• Belts
• Removal of dust, dirt and debris
• Dampers for roof upblast configuration
Fasteners and Set Screws - Normal fan vibration has
a tendency to loosen mechanical fasteners. Periodic
inspection should include checking all fasteners, set
screws, and locking collars attaching the propeller to
the shaft and the shaft to the bearings. Loose bearing
set screws and locking collars will lead to premature
failure of the fan shaft.
Bearings on belt drive fans - Bearings are the most
critical moving part of the fan and should be inspected
at periodic intervals. Locking collars and set screws,
in addition to fasteners attaching the bearing to the
bearing plate, must be checked for tightness.
In a clean environment and temperature between 32°
and 200°F (0 to 93°C), fan shaft bearings with grease
fittings should be lubricated semi-annually using a high
quality lithium based grease. Bearings operating outside
these temperature parameters require special high
or low temperature grease. If unusual environmental
conditions exist, such as temperatures below 32°F
(0°C) and above 200°F (93°C), high moisture, or
contaminants, more frequent lubrication is required.
With the unit running, add grease very slowly with a
manual grease gun. Be careful not to unseat the seal by
over lubricating or using excessive pressure. Bearings
without grease fittings are lubricated for life.
Bearings are one of the most critical parts of a fan and
should be inspected at regular intervals. Locking collars,
set screws and fasteners attaching the bearings to the
fan should also be checked.
Model TBI fans are equipped with extended lubrication
lines as standard. The grease fittings are located on the
exterior of the fan housing next to the motor cover and
should be wiped clean before adding grease.
Motors - Lubrication of motors is intended only when
fittings are provided. Many fractional horsepower
motors are permanently lubricated for life and require
no further lubrication. Motors supplied with grease
fittings should be greased in accordance with the
manufacturer’s directions on the motor nameplate.
Belts - Premature belt failures are frequently caused
by improper belt tension (either too loose or too tight),
misaligned pulleys, or by prying belts on and off pulleys.
The proper tension for operating a V-belt is the lowest
tension at which the
belts will not slip at peak
load conditions. For
initial tensioning, the
proper belt deflection is
1/64-inch for each inch
of belt span, measured
half way between the
pulley centers.
For example, if the belt span is 64 inches, the belt
deflection should be one inch using moderate thumb
pressure at midpoint of the drive (Fig. 2).
Check belt tension two times during the first 24 hours of
operation, after 100 hours of operation, and periodically
thereafter. To adjust belt tension, simply pivot the motor
on the motor plate. Use the bolts in the slotted brackets
and adjustment rods with bolts as adjustment points
until proper belt tension is attained.
It is very important that the drive pulleys remain in
proper alignment after adjustments. (Fig. 3)
When replacing belts, always use the same size and
type as originally supplied by the factory. Check pulleys
for wear and replace both pulleys and belts if wear is
evident. Misalignment of pulleys will result in premature
belt and bearing failure, noise and loss of fan efficiency.
WARNING
Always disconnect power before working on or near a
unit. Lock and tag the disconnect switch or breaker to
prevent accidental power up. Failure to comply with
this safety precaution could result in serious injury or
death.
CORRECT WRONG WRONG WRONG
CORRECT WRONG
WRONG WRONG
Belt Span
Deflection = Belt Span
64
Fig. 2
CORRECT WRONG WRONG WRONG
CORRECT WRONG
WRONG WRONG
Belt Span
Deflection = Belt Span
64
CORRECT WRONG WRONG WRONG
CORRECT WRONG
WRONG WRONG
Belt Span
Deflection = Belt Span
64
Fig. 3
6 Tubular Inline Fans
®