Routine Maintenance - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Routine Maintenance

DANGER
Disconnect and secure to the "off" position all
electrical power to the fan prior to inspection
or servicing. Failure to comply with this safety
precaution could result in serious injury or death.
DANGER
Pour écarter les risques de blessure grave ou
de mort, débrancher et verrouiller l'alimentation
électrique en position « Arrêt » avant tout contrôle
ou entretien.
IMPORTANT
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 non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
AVERTISSEMENT
L'appareil doit être rendu non opérationnel lors
du nettoyage de la turbine ou du caisson (fusibles
retirés, sectionneur verrouillé).
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.
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 and Bearing Maintenance for GB
Model
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 multi-groove pulleys.
3. For belt replacement, loosen the tensioning device
enough to allow removal of the belt by hand.
4. Once installed, adjust belts as shown in
"Pre-Starting Checks."
5. To ensure tightness, check pulley setscrews.
Proper keys must be in keyways.
6. Fan RPM should not be readjusted. Only use
pulleys of identical size and type when replacing
pulleys.
7. Shaft bearings can be classified in two
groups: relubricating and non-relubricating. All
non-relubricating bearings on model GB fans
are factory lubricated and require no further
lubrication under normal use (between -20º
to 180ºF (-29º to 82ºC) in a relatively clean
environment).
8. On GB 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.
9. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
10. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used. (See Table 3)
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.
Downblast Centrifugal Roof Exhaust 9