20
Air Handling Unit
Installation, Operation, and Maintenance Manual
April 2021
12.5 Bearing Lubrication
There is a direct relationship between bearing life and bearing lubrication practices. Lubricating fan bearings at
proper intervals will enhance bearing life. Recommended lubrication intervals for belt-driven fans are contained in
Tables 12-1 and 12-2. Severe operating conditions such as temperature and/or humidity extremes can require more
frequent lubrication. Good maintenance practice dictates that frequent inspections should determine the frequency
of lubrication. In most cases the following tables are applicable. To insure longevity in your equipment contact the
fan manufacturer to verify the type of lubricant to use.
Do not mix lubricant types.
When lubricating fan bearings,
care must be taken to guard against damaging seals. To avoid seal damage, the fan must be rotating when lubricant
is being added. Grease must be applied slowly. If seals are damaged due to over lubrication, replace the bearings
immediately.
Table 12-1. Recommended Fan Bearing Lubrication Schedule -
Standard Grease
Lubrication Schedule in Months*
Fan RPM
Bearing Bore (inches)
1/2 - 1
1-1/8 - 1-1/2
1-5/8 -1-7/8
1-15/16 -
2-3/16
2-7/16 - 3
3-3/16 - 3-1/2
3-15/16 -
4-1/2
4-15/16 -
5-1/2
To 250
12
12
12
12
12
12
10
9
500
12
12
10
10
8
7
5
5
720
12
9
8
7
6
4
3
3
1000
12
7
6
5
4
3
2
1
1250
12
6
5
4
3
2
1
0.75
1500
12
5
4
3
2
1
0.5
X
2000
12
3
2
2
1
0.5
0.25
X
2500
12
2
2
1
0.5
0.25
X
X
3000
12
2
1
0.5
0.25
X
X
X
3500
12
1
0.5
0.25
X
X
X
X
4000
12
0.5
0.25
X
X
X
X
X
5000
12
0.25
X
X
X
X
X
X
# of Shots
4
8
8
10
16
25
41
57
*Lubrication interval is based upon 12-hours of operation per day and a maximum of 160⁰F housing temperature
For 24-hours per day of operation, divide interval by half.
**Lubricant should be added with shaft rotating and until clean grease is seen purging from the bearing.
The lubrication interval may be modified based upon condition of the purged grease.
If bearing is not visible to observe purged grease, lubricate with number of shots indicated for bore size.
Consult factory for lubrication intervals under severe operating conditions such as high temperatures, moisture, dirt or excessive vibration.
Lubricant should be a high quality lithium complex grease conforming to NLGI Grade 2.
ClimateCraft recommends
Mobilux EP-2
.
Storage periods of 3-months or longer require monthly shaft rotation and purging of the grease prior to startup.
Do not allow grease on sheaves or belts.
