Tabla de contenido
Idiomas disponibles
Idiomas disponibles
provided with external grease fittings. Annual
lubrication is recommended, or more frequently
if needed (See Table 2). Do not over-grease. Use
only one or two shots of lubricant with a hand
gun. Maximum hand gun rating is 40 psi. Rotate
bearings during lubrication where good safety
practice permits. Caution should be employed to
prevent over packing or contamination.
9. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
10. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used. (See Table 3)
11. During the first few months of operation, check
bearing setscrews periodically to ensure tightness.
12. If unit is to be left idle for an extended period,
remove belts and store in a cool, dry place to avoid
premature belt failure.
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist (extreme
temperature, moisture or contaminants) more frequent
lubrication is required.
A good quality lithium base grease, conforming to NLGI
Grade 2 consistency, such as those listed here may be
used.
Table 2: Suggested Fan Bearing Greasing Intervals
Interval
(months)
Heavy duty in dirty, dusty locations; high ambient
1 to 3
temperatures; moisture laden atmosphere; vibration.
12 to 24 hours per day, heavy duty, or if moisture is
3 to 6
present
8 to 16 hours per day in clean, relatively dry
6 to 12
atmosphere
12 to 18
Infrequent operation or light duty in clean atmosphere
Table 3: Grease Manufacturers
Manufacturer
U.S. Electric Motors
Chevron U.S.A. Inc
Mobil Oil Corporation
Texaco, Inc.
Amoco Oil Co.
Exxon
Shell
Poor
Type of Service
Grease (NLGI #2)
Grease No. 83343
Chevron SRI Grease #2
Mobilith
Mobil 532
Premium BRB #2
Texaco Multifak #2
Rykon Premium #2
Unirex N2
B Shell Alvania #2
Fan Inlet Connections
In order to assure proper fan performance, caution must be
exercised in fan placement and connection to the ventilation
system. Obstructions, transitions, poorly designed elbows,
improperly selected dampers, etc. can cause reduced
performance, excessive noise and increased mechanical
stress. For performance to be as published, the system must
provide uniform and stable airflow into the fan.
Poor
Poor
Poor
Dampers must open fully.
Use motorized dampers in
low airflow applications to
reduce losses.
Poor
Good
Provide uniform airflow at fan
inlet and through the damper to
Good
assure optimum performance.
The curb cap should be three
wheel diameters from the
radius. Use turning vanes in
duct when possible.
Poor
Poor
Good
Avoid sharp turns or entrance
conditions which cause
uneven flow. Use turning
vanes in elbows to reduce
Good
Good
adverse effects.
Poor
Good
Provide uniform airflow at
fan inlet to assure optimum
performance.
Roof Mounted Downblast Fans
Good
9
Tabla de contenido
