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13
ROUTINE MAINTENANCE
CAUTION: See **WARNING** on Page 1 and 11
Once the unit has been put into operation, a periodic maintenance program should be set up to preserve the
reliability and performance. Items to be included in this program are:
• BELTS
• MOTORS
• WHEEL AND FASTENERS
• VIBRATION
• FILTER MAINTENANCE
• COIL MAINTENANCE
• ENERGY WHEEL CASSETTE
FAN BELTS
Belts tend to stretch after a period of time. They should be
periodically checked for tension and wear. When replacing
belts, use the same type as supplied with the unit.
Replacement of belts should be accomplished by loosening
the motor slide plate so the belts may be removed by hand.
Do not force belts on or off as this may cause breakage of
cords and lead to premature belt failure.
Belt tension should be adjusted to allow 1/64 in. of belt
deflection per 1 in. of belt span. For example, a 16 in. belt
span should have 16/64 in. or 1/4 in. of deflection with
moderate thumb pressure at mid-point between the pulleys
(FIGURE 18).
Deflection =
Belt Span
64
Belt Span
FIGURE 18
MOTORS
Motor maintenance is generally limited to cleaning and lubrication (where applicable). Cleaning should be
limited to exterior surfaces only. Removing dust and grease build-up on the motor housing assures proper
motor cooling. Use caution and do not allow water or solvents to enter the motor or bearings. Under no
circumstances should motors or bearings be sprayed with steam, water or solvents.
Greasing of motors is intended only when fittings are provided. Many fractional horsepower motors are
permanently lubricated for life and require no further lubrication. Motors supplied with grease fittings should
be greased in accordance with the manufacturer’s recommendations.
WHEEL AND FASTENERS
Wheels require very little attention when moving clean air. Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel and housing should be cleaned to assure smooth and
safe operation. Inspect fan impeller and housing for fatigue, corrosion or wear.
Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and
accessories for tightness. A proper maintenance program will help preserve the performance and reliability
designed into the fan.