210.100-IOM (JUL 2021)
Page 45
AcuAir Hygienic Air Units
Maintenance
Table 11: Motor bearing lubrication intervals
NEMA/(IEC
) frame size
Rated speed - rpm
10,000
6,000
3,600
1,800
1,200
900
Up to 210 incl. (132)
**
2,700 hr
5,500 hr
12,000 hr
18,000 hr
22,000 hr
Over 210 to 280 incl. (180)
-
-
3,600 hr
9,500 hr
15,000 hr
18,000 hr
Over 280 to 360 incl. (180)
-
-
*2,200 hr
7,400 hr
12,000 hr
15,000 hr
Over 360 to 5,800 incl. (180)
-
-
*2,200 hr
3,500 hr
7,400 hr
10,500 hr
* Lubrication intervals are for ball bearings. For roller bearings, divide the listed lubrication interval by 2.
** For 6807 bearings, consult oil mist lubrication (MN410)
Relubrication interval for 6205 bearing is 1,550 hr, using grease lubrication)
Relubrication interval for 6806 bearing is 720 hr, using grease lubrication)
Table 12: Motor bearing lube interval multiplier
Severity of service
Multiplier
Standard
1.0
Severe
0.5
Extreme
0.1
Low temperature
1.0
Mounting hardware and adjustable motor
base
• Inspect for loose parts.
• Inspect for damage.
Motor condition (visual)
• Inspect for leaky bearing seals.
• Inspect for damage.
• Inspect for dirt, dust and debris in air vents on motor
housing.
Electrical checks
• Inspect all electrical terminations.
•
Inspect conduit fittings and clamps for damage or
looseness.
• Inspect operating amperage and compare to name-
plate.
Lubrication
Motor bearing lubricant -
Bearing grease loses its lubri-
cating ability over time. The lubricating ability of grease
depends primarily on the type of grease, the size of the
bearing, the speed at which the bearing operates, and the
severity of the operating conditions. You can help maintain
lubricating ability if you implement the following guidance
in your maintenance program:
• Use a high-grade ball or roller bearing grease. Sug-
gested grease for standard service conditions is
Polyrex EM (Exxon Mobil).
–
Maximum operating temperature for standard mo-
tors = 110°C.
–
Shutdown temperature in case of a malfunction =
115°C.
• Correct lubrication intervals – See
for
lu-
brication intervals. It is important to realize that the
intervals in
are based on average use. For
additional information see
.
• See
for motor lubrication procedure.
CAUTION
Be sure that the grease you are adding to the motor
is compatible with the grease already in the motor.
Consult your distributor or an authorized service
center if using grease other than the suggested type.
CAUTION
To avoid damage to motor bearings, grease must be
kept free of dirt. For an extremely dirty environment,
contact your distributor or an authorized Service
Center for additional information.
With grease relief plug, perform the following steps:
1. Clean all
grease fittings.
2. Remove the grease relief plug.
3. Add only the appropriate amount of grease.
4. Reinstall the grease relief plug
Figure 52: Grease fittings
