Table 56: 25 ton to 80 ton: service conditions
Conditions
Daily hours
of operation
Max. ambient
temperature (°F)
Atmospheric
contami-tion
Lubrication
interval multiplier
Standard
8
104
Clean, little
corrosion
1
Severe
16 or more
122
Moderate dirt,
corrosion
0.5
Extreme
16 or more
>122.0* or class H
insulation
Severe dirt, abrasive
dust, corrosion,
heavy shock or
vibration
0.1
Low temperature
-
< -20.2**
-
1
Note:
•
*Special high temperature grease
is recommended (Dow Corning
MOLYKOTE® 44 High Temperature
Bearing Grease).
•
**Special low temperature grease is
recommended (AeroShell Grease 7).
•
Different grease types are generally
incompatible and should not be mixed.
Mixing different types can cause
lubricant and bearing failure.
•
Thoroughly clean bearing and cavity
before changing grease type.
Table 57: 25 ton to 80 ton: Re-lubrication intervals
Rated speed (RPM)
NEMA (IEC)
frame size
3600
1800
1200
900
Up to 210 incl. (132) 5,500 hours
12,000 hours
18,000 hours
22,000 hours
120–280 incl. (180)
3,600 hours
9,500 hours
15,000 hours
18,000 hours
280–360 incl. (225)
2,200 hours
7,400 hours
12,000 hours
15,000 hours
360–5,800 incl. (400) 2,200 hours
3,500 hours
7,400 hours
10,500 hours
324T (200)
-
3,000 hours
-
-
Note:
•
Re-lubrication intervals are for ball
bearings. For vertically mounted
motors and roller bearings, divide
the re-lubrication interval by 2. For
motors operating at speeds greater
than 3,600 RPM, contact ABB Motors
and Mechanical, Inc. for re-lubrication
recommendations.
•
For 60 ton to 80 return fan TECO motors,
regreasing will not be applicable.
•
324T (TECO motor) applicable only to 60
ton to 80 ton return fan.
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
56–140 (90)
6203
0.08 (2.4)
0.15
0.5
140 (90)
6205
0.15 (3.9)
0.2
0.8
180 (100–112)
6206
0.19 (5.0)
0.3
1.0
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
96
Tempmaster
