Table 58: Amount of grease to add
Bearing description (large bearings (shaft end) in each frame size)
Volume of grease
NEMA (IEC)
frame size
Bearing
Weight of grease
oz (grams)
Inches
3
Teaspoon
210 (132)
6307
0.30 (8.4)
0.6
2.0
250 (160)
6309
0.47 (12.5)
0.7
2.5
280 (180)
6311
0.61 (17)
1.2
3.9
320 (200)
6312
0.76 (20.1)
1.2
4.0
324T (200)
6212
1.41 (40)
-
-
324T (200)
6213
1.76 (50)
-
-
324T (200)
6310
1.41 (40)
-
-
324T (200)
6213
2.12 (60)
-
-
360 (225)
6313
0.81 (23)
1.5
5.2
400 (250)
6316
1.25 (33)
2.0
6.6
440 (280)
6318
1.52 (40)
2.5
8.2
440 (280)
6319
2.12 (60)
4.1
13.4
5,000–5,800
(315–400)
6328
4.70 (130)
9.2
30.0
5,000–5,800
(315–400)
NU328
4.70 (130)
9.2
30.0
360–449 (225–280)
NU319
2.12 (60)
4.1
13.4
AC induction servo
76 Frame 180 (112)
6207
0.22 (6.1)
0.44
1.4
77 Frame 210 (132)
6210
0.32 (9.0)
0.64
2.1
80 Frame 250 (160)
6213
0.49 (14.0)
0.99
3.3
Note:
324T (TECO motor) applicable only to 60
ton to 80 ton return fan.
Table 59: 25 ton to 80 ton: fan bearing lubrication schedule (months) for ball bearing pillow blocks
Speed (RPM)
Shaft
diameter (in.)
500
1000
1500
2000
2500
3000
3500
4000
4500
1/2 - 1 11/16
6
6
5
3
3
2
2
2
1
1 15/16 - 2 7/16
6
5
4
2
2
1
1/2
1/4
1/4
2 11/16 - 2 15/16
5
4
3
2
1
1/2
1/2
-
-
3 7/16 - 3 15/16
4
3
2
1
1/2
1/2
-
-
-
Fan bearing lubrication
Add grease slowly with the shaft rotating until a
slight bead forms at the seals. If necessary, re-
lubricate while the bearing is stationary. The fan
data plate (attached to the fan scroll) lists the
type of grease that must be used for lubricating
the bearings. Refer to Table 59 for the lubricating
schedule.
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
97
Tempmaster