IMPORTANT
Adjust (tighten) belt tension after the first
Maintenance: NYD/NYB
A proper maintenance program will help these units deliver years of dependable service. Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations and who are experienced with this type of equipment.
Motor maintenance is generally limited to cleaning and lubrication (where applicable). Cleaning should be limited to exterior surfaces only. Removing dust buildup on motor housing ensures proper motor cooling.
Greasing of motors is only intended when fittings are provided. Many fractional horsepower motors are permanently lubricated and should not be lubricated after installation. Motors supplied with grease fittings should be greased in accordance with manufacturers’ recommendations. Where motor temperatures do not exceed 104ºF (40ºC), the grease should be replaced after 2,000 hours of running time as a general rule.
Direct drive units require little maintenance except for cleaning wheel, alignment and oiling according to motor label instructions.
The unit should be made
Wheels require very little attention when moving clean air. Occasionally, oil and dust may accumulate causing imbalance. When this occurs the wheel and housing should be cleaned to ensure smooth and safe operation.
All fasteners should be checked for tightness each time maintenance checks are performed prior to restarting unit.
A proper maintenance program will help these units deliver years of dependable service.
Belt/Bearing Maintenance NYB Unit
1.Belts tend to stretch after a period of time. They should be checked periodically for wear and tightness. When replacing belts, use the same type as supplied with the unit.
2.Matched belts should always be used on units with
3.For belt replacement, loosen the tensioning device enough to allow removal of the belt by hand. Do not force the belts on or off. This may cause cords to break, leading to premature failure.
4.Once installed, adjust belts as shown in “Pre‑Starting Checks.”
5.Shaft bearings can be classified in two groups: relubricating and
6.Units installed in hot, humid or dirty locations should be equipped with special bearings. These bearings will require frequent lubrication.
7.On NYB belt driven fans, the standard cast pillow block bearings are factory lubricated and are provided with external grease fittings. Annual lubrication is recommended, or more frequently if needed, see Table 2. Do not over- grease. Use only one or two shots of lubricant with a hand gun. Maximum hand gun rating is 40 psi. Rotate bearings during lubrication where good safety practice permits. Caution should be employed to prevent over packing or contamination.
7.Grease fittings should be wiped clean. The unit should be in operation while lubricating. Extreme care should be used around moving parts.
8.Grease should be pumped in very slowly until a slight bead forms around the seal. A high grade lithium base grease should be used.
9.To ensure tightness, check pulley setscrews. Proper keys must be in keyways.
10.Fan RPM should not be readjusted. Only use pulleys of identical size and type when replacing pulleys.
11.During the first few months of operation check bearing setscrews periodically to ensure tightness.
12.If unit is to be left idle for an extended period, remove belts and store in a cool, dry place to avoid premature belt failure.
WARNING
Always disconnect, lock and tag power source before servicing. Failure to disconnect power source can result in fire, shock or serious injury.
CAUTION
Uneven cleaning of the wheel will produce an out of balance condition that will cause vibration in the fan.
WARNING
This unit should be made
Models NYD & NYB •
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