JOHNSON CONTROLS
94
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 4 – MAINTENANCE
4. Loosen and remove the two setscrews from the
Condenser / Compressor side of the supply fan
wheel.
5. Using a rubber mallet or brass bar, slowly drive
the shaft in one direction until the set screw marks
on the shaft are fully exposed. File the marks
completely smooth. Drive the shaft in the oppo-
site direction and le smooth the setscrew marks.
6. To remove the key, use a rubber mallet or brass
bar to drive the shaft and wheel in one direction.
Drive the key in the opposite direction using a
nail set or smaller size key stock until the key is
completely free of the wheel. Be sure the key does
not get bent by allowing it to ride up the key way
edge. The slightest bend prevents quick assembly.
Should it occur, replace the key stock.
7. Remove the shaft, supporting the weight of the
wheel. Do not allow the weight of the wheel to be
supported by only one bearing during the disas-
sembly process.
8. Remove the wheel through the blower compart-
ment access door.
9. Reassemble in reverse order, centering the wheel
over the inlet cone. If bearings were removed or
replaced, be sure to reuse any shim stock found
between the mounting support / plate and bearing
housings.
10. Torque all hardware.
11. Reassemble the Control / Blower section to the
Compressor / Condenser section.
Disconnect and lock-out power from the
unit anytime service is performed on the
fan section. Failure to do so could result
in serious injury or death due to the fan
turning ON while work is in progress.
Fan Motor
1. Shut off unit power and lock out.
2. Disconnect and tag power wires at motor termi-
nals.
3. Loosen motor brace-to-mounting-rail attaching
bolts.
4. Mark belt as to position. Remove and set aside
belts.
5. Remove motor bracket hold down bolts.
6. Remove motor pulley and set aside.
7. Remove motor.
8. Install new motor. Reassemble by reversing steps
1 through 6.
9. Be sure to reinstall multiple belts in their origi-
nal position. Always replace belts in a set. Do not
stretch belts over sheaves. Review the sections on
motor and sheave installation, sheave alignment,
and belt tensioning discussed previously.
10. Reconnect motor leads and restore power.
11. Check fan for proper rotation as described in
Start-Up Check List.
Fan Shaft Bearings
When removing and replacing the bearings, care should
be taken to ensure that the area where the bearings fit
on the shaft does not become scored or damaged. The
shaft in this area should be thoroughly cleaned before
the bearing is removed and again before the new bear-
ing is installed.
Mounting Details
1. Check the shaft. It should be straight, free of burrs
and full size. Be sure the bearing is not seated on
a worn section of shafting.
2. Make certain any set screws are not obstructing
the bearing bore.
3. Align the bearing in its housing and slide the bear-
ing into position on shaft. Never hammer the ends
of the inner race. If necessary, use a brass bar or
pipe against the inner race to drift bearing into
place. Never hit the housing, as bearing damage
may result. Check that there is lubricant between
the bearing outer ring and the housing.
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