Greenheck Vektor-H Installation, Operation And Maintenance Manual page 6

Belts
Premature belt failures are frequently caused by improper belt tension (either too
tight or too loose) or misaligned pulleys. The proper tension for operating a V-belt is
the lowest tension at which the belts will not slip at peak load conditions. For initial
tensioning, the proper belt deflection half-way between pulley centers is 1/64 inch for
each inch of belt span. For example, if the belt span is 64 inches, the belt deflection
should be one inch using moderate thumb pressure at midpoint of the drive.
Check belt tension two times during the first 24 hours of operation and periodically
thereafter. To adjust belt tension, simply loosen four fasteners (two on each side of
the motor plate) and slide the motor plate away from the fan shaft until proper belt
tension is attained. On some fans, fasteners attaching the motor to the motor plate
must be loosened in order to adjust the belt.
It is very important that the drive pulleys remain in proper alignment after
adjustments are made. Misalignment of pulleys will result in premature belt wear,
noise, vibration and power loss.
Fasteners and Set Screws
A periodic inspection should include checking all fasteners and set screws for tightness. Particular attention
should be paid to set screws attaching the propeller to the shaft and the shaft to the bearings. Loose bearing
set screws will lead to premature failure of the fan shaft.
Motors
Many fractional horsepower motors installed on the smaller fans are lubricated for life and require no further
attention. Motors supplied with grease fittings should be greased according to directions printed on the motor.
Removal of Dust and Dirt
Dirt clogs cooling openings on the motor housing, contaminates bearing lubricant, and collects on the impeller
causing severe imbalance if left unchecked. The exterior surface of the motor and impeller should be thoroughly
cleaned periodically. 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 or water.
Exhaust Fans Part List
Each fan bears a manufacturer's nameplate with model number and serial number embossed. This information
in addition to the parts list shown, will assist the local Greenheck representative and the factory in providing
service and replacement parts.
Our Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year
from the purchase date. Any units or parts which prove defective during the warranty period will be replaced at
our option when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer
for a period one year. Should motors furnished by Greenheck prove defective during this period, they should be
returned to the nearest authorized motor service station. Greenheck will not be responsible for any removal or
installation costs.
Greenheck reserves the right to change specifications without notice.
BELT
MOTOR
PULLEY
MOTOR
WHEEL
As a result of our commitment to continuous improvement,
Side View
BEARING
BELT SHAFT
TUBE PULLEY COVER
BEARINGS
SHAFT
INLET CONE
(VENTURI)
Deflection = Belt Span
Belt Span
Top View
MOTOR
MOTOR
PLATE
COVER
(OPTIONAL)
BEARING
SUPPORT
#469003 Vektor-H IOM
Rev. 2, August 2006
Copyright © 2006 Greenheck Fan Corp.
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