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Air Handling Unit
Installation, Operation, and Maintenance Manual
April 2021
Table 12-2. Recommended Fan Bearing Lubrication Schedule -
Synthetic 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
12
12
500
12
12
12
12
12
12
12
12
720
12
12
12
12
12
12
10
8
1000
12
12
12
12
12
9
6
5
1250
12
12
12
12
9
6
4
2
1500
12
12
12
10
7
4
2
X
2000
12
9.5
7
6
6
1.5
0.5
X
2500
12
7
4
4
1
0.5
X
X
3000
12
5
2
2
0.5
X
X
X
3500
12
3
1
0.75
X
X
X
X
4000
12
2
0.25
X
X
X
X
X
5000
12
1
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 synthetic grease conforming to NLGI Grade 2.
ClimateCraft recommends
Mobilith SHC-100
.
The use of non-synthetic grease will decrease lubrication intervals by approximately 3 times.
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.
Motor Bearing Lubrication
Motor maintenance generally requires only cleaning and lubrication. Cleaning should be limited to exterior surfaces.
Removing dust and grease on the motor housing assists cooling. Never wash-down a motor with high pressure
spray. Greasing motors is only intended when fittings are provided. Many fractional motors are permanently
lubricated for life and require no further lubrication. Motors supplied with grease fittings should be greased in
accordance with the manufacturer’s recommendations. When motor ambient temperature does not exceed 104°F
(40°C), the grease should be replaced after 2000 hours of running time.
