Page 22 of 40
Bulletin
441G
MAINTENANCE
1.
FAN OPERATION IN OFF SEASON
During the off season, the fan blade should be allowed to turn freely. Also, during the off
season,
OPERATE THE FAN FOR APPROXIMATELY 30 MINUTES EVERY THREE WEEKS
.
The operation of the fan keeps the lubricant more evenly distributed within the bearing cavity
and dries out any condensation that could be in the motor.
2.
FAN CONTROL MAINTENANCE
During the off season, make sure the control enclosure cover is secured to the control
enclosure. Before operating, the magnetic contactor should be inspected to make sure all
contact points are clean and unobstructed. Also, check points for pitting and replace the
magnetic contactor if the points are defective.
3.
FAN MOTOR LUBRICATION
The life of a motor is very dependent on the life of the bearings. Before lubricating the
bearings, inspect the bearings to make sure they are still in good condition. If not, the
bearings will need to be replaced. The fan motor uses sealed bearings, however, the bearing
cavity should still be lubricated. The motor should be lubricated once a year prior to the
operating season per the following instructions.
A.
AXIAL FAN
1.
To lubricate a motor with filler and drain holes, remove both plugs and clean the
holes of any hardened lubricants. Approximately three standard pumps of Shell
Dolium R or Chevron SRI-2 lubricant should be added. Allow the motor to run for
approximately 10 minutes before reinstalling the drain plug.
2.
To lubricate a motor without filler and drain holes, first clean out any hardened
grease, and then add the Shell Dolium R or Chevron SRI-2 lubricant to fill ¾ of the
cavity of the end bell.
CAUTION: The lubricants listed above are designed to operate at high
temperature and have a rust inhibitor for extended bearing life. DO NOT MIX
OTHER GREASES WITH THE GREASE IN THE BEARINGS. DO NOT OVERLUBRICATE
THE BEARINGS AS THE LUBRICANT WILL WORK ITS WAY INTO THE MOTOR AND
CAUSE PREMATURE MOTOR FAILURE.
4.
FAN BLADE CLEANLINESS
Either once a year, or if vibration develops, clean the fan blade so the unit runs smoothly.
Also check the fan to make sure it is mounted properly. Refer to the installation instructions
on
Page 17
for instructions on leveling the fan.
Summary of Contents for Caldwell AF12-751
Page 2: ...Page 2 of 40 Bulletin 441G ...
Page 23: ...Page 23 of 40 Bulletin 441G Figure 16 Wiring Schematic for AF12 751 Fan ...
Page 24: ...Page 24 of 40 Bulletin 441G Figure 17 Wiring Schematic for AF18 11 Fan ...
Page 25: ...Page 25 of 40 Bulletin 441G Figure 18 Wiring Schematic for 230 Volt Single Phase Axial Fan ...
Page 26: ...Page 26 of 40 Bulletin 441G Figure 19 Wiring Schematic for 230 Volt Three Phase Axial Fan ...
Page 27: ...Page 27 of 40 Bulletin 441G Figure 20 Wiring Schematic for 460 Volt Three Phase Axial Fan ...
Page 38: ...Page 38 of 40 Bulletin 441G NOTES ...
Page 39: ...Page 39 of 40 Bulletin 441G NOTES ...
Page 40: ...Page 40 of 40 Bulletin 441G ...