York YPAL 061 manual Maintenance, Condenser Coils, Motor Bearing Lubrication, Belt Tension, Belts

Maintenance

Condenser Coils

Dirt should not be allowed to accumulate on the condenser coil surfaces. Cleaning should be as often as necessary to keep coil clean.

PERIODIC MAINTENANCE – THREE TO SIX MONTHS

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.

Squealing belts during starting is caused by slipping belts that are not tensioned properly.

Motor Bearing Lubrication

Bearings must be re-lubricated periodically to assure long life. Motor bearing should be lubricated yearly, but may need lubrication more frequently, depending on severe operating conditions.

Belt Tension

Adjust the belt tension if necessary. Required belt tension data is supplied on the fan “skid” data plate, attached to the fan housing. Never use a belt dressing on the belts. If belts slip with the proper tension, use a good grade of belt cleanser to clean the belts. Refer to Figures 4-1.

Never use excessive belt tension, as this could result in damaging the bearing, motor pulleys or motor base. See drive label on fan housing adjacent to drive for specific details on tension.

When it is necessary to replace one belt in a given set, the entire set of belts must be replaced.

FORM 100.50-NOM6 (1207)

PERIODIC MAINTENANCE – YEARLY

Check the fan wheels and inspect the drain pan for sludge and foreign material. Clean if required.

Observe the operation of all dampers and make any necessary adjustments in linkage and blade orientation for proper operation.

Entire Unit Inspection

In addition to the checks listed in this section, periodic overall inspections of the unit should be accomplished to ensure proper equipment operation. Items such as loose hardware, component operation, refrigerant leaks, unusual noises, etc. should be investigated and corrected immediately.

Sheave Alignment:

To check sheave alignment, a straight edge or a piece of string can be used. If the sheaves are properly aligned, the string or straight edge will touch at all points, as indicated in Figure. 4-1. Rotating the sheaves will determine if the sheave is wobbly or the drive shaft is bent.Alignment error must be corrected to avoid bearing and belt failure.

CORD TIED

TO SHAFT

CORD TOUCHING SHEAVES AT

POINTS INDICATED BY ARROWS

LD07634

FIG. 4-1 – SHEAVE ALIGNMENT

Belts

New belts should be re-checked after 24 hours of operation. On multiple belt adjustable pulleys, the pitch depth should be checked to insure identical belt travel, power transfer and wear. Adjustable motor bases are provided for belt adjustment.

Motor pulleys and blower shaft pulleys are locked in position with either set screws or split taper lock bushings. All set screws and/or taper lock bolts must be checked for tightness and alignment before putting equipment into operation.

56 JOHNSON CONTROLS