York YPAL 060, YPAL 061, YPAL 050, YPAL 051 manual Fan Motor, Fan Shaft Bearings, Mounting Details

Disconnect and lock-out power from the unit anytime service is being per- formed 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 terminals.

3.Loosen motor base-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 - 6. Be sure to reinstall multiple belts in their original position. Use a complete new set if re- quired. Do not stretch belts over sheaves. Review the sections on motor and sheave installation, sheave alignment, and belt tensioning discussed previously.

9.Reconnect motor leads and restore power. Check fan for proper rotation as described in Start-Up Check List.

Fan Shaft Bearings

General – 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 bearing is installed.

FORM 100.50-NOM6 (1207)

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. Make sure there is lubricant between the bearing outer ring and the housing.

4.Fasten the bearing housing to the unit mounting support with hex head cap screws, washers, new lock washers and hex nuts before securing the bear- ing to the shaft. This permits the bearing to align itself in position along the shaft and eliminates any possibility of cramping loads.

5.Rotate the shaft to make certain it turns freely.

6.Bearings may employ one of several different	4
methods to lock the bearing to the shaft.

Shaft should be free from burrs. If old shaft is used, be sure a ball bearing is not seated on worn section and shaft is not bent.

There are various degrees of self-alignment in bearings of the same manufacturer. The force required for the self-alignment of the bearings used in JOHNSON CONTROLS manufactured units has been specified and is closely monitored at the factory. If it is necessary 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.

JOHNSON CONTROLS 59