Twin City Backward Inclined Hinged Restaurant Exhaust Fan - BHRE - IM-610 - Manual (Page 7)

Twin City IM-610 7
Inspection
Inspection of the fan should be completed at the first
30 minutes, 8 hour and 24 hour intervals of satisfac-
tory operation.
30 Minute Interval
Inspect tightness of all hardware, setscrews and motor
mounting bolts. Adjust and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. See Belt Adjustment
and tension as necessary
24 Hour Interval
Inspect belt tension, adjust as necessary.
Maintenance
A maintenance program should be established to main-
tain the reliability and performance of the fan. The
frequency of inspection depends on the location and
operating conditions of the fan.
Maintenance is to be performed only by qualified per-
sonnel who are familiar with local codes and regula-
tions and experienced with this type of equipment.
Routine maintenance should cover the following:
a. Tighten all setscrews and hardware.
b. Check belt tension and sheaves for wear.
c. Lubricate fan bearings (see Table 4 for recom-
mended interval and Table 5 for grease types.
d. Cleaning of unit, wheel and grease box.
1. Before performing any maintenance on the fan, be
sure power is turned off and locked in the off
position at the service entrance.
2. Ventilators should be carefully checked at least
once a year. For critical or rugged applications, a
routine check every two or three months is sug-
gested.
3. Always follow the bearing manufacturer's recom-
mended lubrication schedule. If not available, below
is a general guideline:
Table 4.
Bearing Greasing Intervals
Fan RPM Interval (months)
Up to 500 6
500 - 1,000 6
1,000 - 1,500 5
1,500 - 2,000 3
2,000 - 2,500 3
2,500 - 3,000 2
Divide the listed interval by 2 for vertical shaft applica-
tions or for 24 hour operation.
Relubricate while running, if safety permits, until some
purging occurs at seals. Adjust lubrication frequency
depending on condition of purged grease. Hours of
operation, temperature and surrounding conditions will
affect the relubrication frequency required.
4. All motors supplied with Twin City Fan & Blower
ventilators carry a one year limited warranty from
date of shipment. For repairs within the warranty
period, the motor must be taken to the motor man-
ufacturer's authorized service dealer. Contact your
TCF representative for additional warranty details.
5. A periodic motor check should consist of removing
the belt, then spinning the motor shaft with the
power off to be sure the motor turns freely and
the bearings run smoothly.
6. When removing or installing a belt, do not force
the belt over the sheave. Loosen the motor mount
so that the belt can be easily slipped over the
sheave. See Belt Adjustment, on page 8.
7. The belt should be removed and carefully checked
for glazing, cracks, ply separation or irregular wear.
A small irregularity in the contact surface of the
belt will result in noisy operation. If any defects are
apparent, the belt should be replaced.
8. Check sheaves for chipping, dents or rough sur-
faces which could damage the belt. Always replace
sheaves with identical size and type.
9. If the unit is left idle for an extended period, the
belts should be removed and stored in a cool, dry
place to avoid premature belt failure.
10. Check sheave setscrews to ensure tightness.
Proper keys must be in keyways.
11. Check for proper belt alignment. See Figure 10.
Improper alignment leads to excessive belt wear,
vibration, noise and power loss.
12. For two-groove drives, matched belts must be
used.
13. When replacing belts, use the same type & size as
supplied on the unit.
14. The standard pillow block bearings on belt driven
ventilators are factory lubricated and are provided
with external grease fittings. Lubrication bi-annually
is recommended, or more frequently if needed. (see
Table 5). It is recommended to add fresh grease
at start-up, but do not over-grease. Use only 1 or
2 shots of a recommended lubricant with a hand
gun in most cases (see Table 5). Maximum hand
gun rating of 40 psi. Rotate bearings during lubri-
cation where good safety practice permits.
Caution: Greases of different soap bases (lithium,
sodium, etc.) may not be compatible when
mixed. Prevent such intermixing by completely purg-
ing the bearing of old greases.
15. The most frequent causes of bearing failure are not
greasing often enough, using an excessive quantity
of grease or using incompatible greases. Excessive
vibration, especially if the bearing isn't rotating, will
also cause bearings to fail. Bearings must also be
protected from water and moisture to avoid internal
corrosion.
16. During the first few months of operation, it is rec-
ommended to periodically check the bearing set-
screws to ensure tightness.
17. Wheels require attention when moving dirty or
grease laden air. Regular cleaning is required to
avoid imbalance caused by accumulation of grease
or dust.
18. All fasteners should be checked for tightness dur-
ing each maintenance.
Table 5.
Grease Manufacturers
Manufacturer Grease (NLGI #2)
Shell Gadus S2 V100 2
Exxon/Mobil Ronex MP