Greenheck DGX Installation, Operation And Maintenance Manual page 25

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 start-up.
Recommended Bearing Lubrication Schedule (in Months*)
Bearing Bore Size (inches)
Fan
RPM
1 ⁄ - 1 1 1 ⁄ - 1 1 ⁄
2 8
250 6 6
500 6 6
750 6 5
1000 5 3
1250 5 3
1500 5 2
2000 5 1
*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 1-2 shots of grease up to 2 inch
bore size, and 4-5 shots above 2 inch bore sizes with a
hand grease gun.
• For roller bearings add 4 shots of grease up to 2 inch bore
size, and 8 shots for 2-5 inch bore size with a hand grease
gun.
• 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
Mobilux #2 Texaco Premium #2
®
1 5 ⁄ - 1 7 ⁄ 1 15 ⁄ - 2 3 ⁄ 2 7
2 8 8 16 16
6 6
6 5
4 3
2 1
2 1
1 1 0.5
1 0.5 0.25
B Shell Alavania #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.
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.
⁄ - 3
Replacement filters should be from the same
16
6 manufacturer and the same size as the original filters
provided with the unit.
4
3
1
1
IMPORTANT
IMPORTANT
DGX Industrial Space Heating 25