Accurex XRUBS-200 Manual de instalação, operação e manutenção - Página 9

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Recommended Bearing Lubrication

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 in Table 3
may be used.
Table 2: Suggested Fan Bearing Lubrication 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
6 to 12
8 to 16 hours per day in clean, relatively dry 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
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 ensure 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
Dampers must open fully.
Use motorized dampers in
low airflow applications to
reduce losses.
Provide uniform airflow at
fan inlet and through the
damper to ensure optimum
performance. Curb cap
should be three wheel
diameters from the radius.
Use turning vanes in duct
when possible.
Poor
Avoid sharp turns or
entrance conditions which
cause uneven flow. Use
turning vanes in elbows to
reduce adverse effects.
Good
Provide uniform airflow at
fan inlet to ensure optimum
performance.
Steel Grease Fan
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