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4
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Disconnect and lock-out power from
the unit anytime service is being per-
formed on the fan sec tion. Failure to
do so could result in serious in ju ry 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
terminals.
3. Loosen motor base-to-mount ing-rail at tach ing
bolts.
4. Mark belt as to position. Re move 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. Re as sem ble by re vers ing steps
1 - 6. Be sure to re in stall mul ti ple belts in their
orig i nal po si tion. Use a complete new set if re-
quired. Do not stretch belts over sheaves. Re view
the sec tions on motor and sheave in stal la tion,
sheave align ment, and belt tensioning discussed
pre vi ous ly.
9. Reconnect motor leads and restore power. Check
fan for proper ro ta tion as described in Start-Up
Check List.
Fan Shaft Bearings
General – When removing and replacing the bearings,
care should be taken to en sure that the area where the
bear ings fi t on the shaft does not be come scored or
dam aged. The shaft in this area should be thoroughly
cleaned before the bearing is removed and again be fore
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 ob struct ing
the bearing bore.
3. Align the bearing in its hous ing and slide the bear-
ing into position on shaft - never hammer the ends
of the inner race. If nec es sary, use a brass bar or
pipe against the inner race to drift bearing into
place - never hit the housing, as bearing dam age
may re sult. Make sure there is lu bri cant between
the bear ing outer ring and the hous ing.
4. Fasten the bearing housing to the unit mount ing
sup port with hex head cap screws, wash ers, new
lock wash ers and hex nuts before se cur ing the bear-
ing to the shaft. This permits the bearing to align
itself in po si tion along the shaft and eliminates any
pos si bil i ty of cramp ing loads.
5. Rotate the shaft to make cer tain it turns free ly.
6. Bearings may employ one of several different
meth ods to lock the bear ing to the shaft.
Shaft should be free from burrs. If old
shaft is used, be sure a ball bearing is
not seat ed on worn section and shaft
is not bent.
There are various degrees of self-alignment in bear ings
of the same man u fac tur er. The force required for the
self-alignment of the bear ings used in JOHNSON
CONTROLS man u fac tured units has been spec i fi ed
and is close ly monitored at the fac to ry. If it is nec es sary
to purchase a bearing locally, be sure it can be worked
around in the housing with a short shaft made of wood
or other soft material placed in the bearing.