Bearings
The bearings for manufacturer fans are carefully selected to match the maximum load and operating conditions of the specific class, arrangement and fan size. The instructions provided in this manual and those provided by the bearing manufacturer will minimize any bearing problems.
IMPORTANT
Lubricate bearings prior to periods of extended shutdowns or storage and rotate shaft monthly to aid in corrosion prevention. If the fan is stored more than three months, purge the bearings with new grease prior to
Recommended Bearing Lubrication Schedule (in Months*)
Fan |
| Bearing Bore Size (inches) |
| ||
RPM | |||||
250 | 6 | 6 | 6 | 6 | 6 |
|
|
|
|
|
|
500 | 6 | 6 | 6 | 5 | 4 |
|
|
|
|
|
|
750 | 6 | 5 | 4 | 3 | 3 |
1000 | 5 | 3 | 2 | 1 | 1 |
1250 | 5 | 3 | 2 | 1 | 1 |
1500 | 5 | 2 | 1 | 1 | 0.5 |
2000 | 5 | 1 | 1 | 0.5 | 0.25 |
*Suggested initial greasing interval is based on 12 hours per day operation and 150°F maximum housing temperature. For continuous (24 hour) operation, decrease greasing interval by 50%
•If extended grease lines are present, relubricate while in operation, only without endangering personnel.
•For ball bearings (operating) relubricate until clean grease is seen purging at the seals. Be sure not to unseat the seal by over lubricating.
•For ball bearings (idle) add
•For roller bearings add 4 shots of grease up to 2 inch bore size, and 8 shots for
•Adjust relubrication frequency based on condition of purged grease.
•A high quality lithium based grease conforming to NLGI
Grade 2 consistency, such as those listed here:
Mobil 532 | Texaco Multifak #2 | B Shell Alavania #2 |
Mobilux #2 | Texaco Premium #2 | Exxon Unirex #2 |
Filters
Filter maintenance is generally limited to cleaning and replacement.
If aluminum mesh filters are installed, they can be washed in warm soapy water.
An adhesive spray can be added to aluminum mesh filters to increase their efficiency.
If disposable filters are installed, they can be checked by holding up to a light source. If light cannot pass through the filter, it should be replaced.
IMPORTANT
When reinstalling filters, be sure to install them with the airflow in the correct direction. An airflow direction arrow is located on the side of the filters.
IMPORTANT
Replacement filters should be from the same manufacturer and the same size as the original filters provided with the unit.
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DGX Industrial Space Heating 25
