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.
Lifting
Lugs
5
Part #469003
READ AND SAVE THESE INSTRUCTIONS
Installation Operation and Maintenance Manual
for Vektor-H Laboratory Exhaust System
Model Vektor
™
-H
®
Receiving
Greenheck model Vektor-H fans are thoroughly inspected, test run at the factory, and shipped on a skid or
packaged to minimize damage during shipment. The transportation carrier has the responsibility of delivering
all items in their original condition as received from Greenheck. The individual receiving the equipment is
responsible for inspecting the unit for obvious or hidden damage and recording any damage on the bill of lading
before acceptance of the equipment. All claims (if necessary) shall be filed with the final carrier.
Single Blower
System
Single Blower System with
Bypass Air Plenum
Multiple Fan System with
Bypass Air Plenums
Handling & Installation
The Greenheck Vektor-H laboratory exhaust system is shipped in subassembly sections for easy rigging
and installation. Depending on the options ordered, the sections can include: Roof Curb, Bypass Air Plenum
Assembly, Blower Assembly, Stack Extension, and Discharge Nozzle.
The Vektor-H is designed to be self-supporting and standing (without the use of guy wires) when assembled per
the instructions provided within this manual. The roof curb must be securely fastened to the roof structure in
accordance with the contract documents. All subassembly sections have lifting lugs as shown.
NOTE!
Lifting lugs on each subassembly are designed to handle the weight of the subassembly section only.
Do not attempt to lift the entire system as a complete assembly.
Lifting
Lugs
Maintenance
WARNING
DISCONNECT ALL ELECTRICAL POWER TO THE FAN AND SECURE TO THE “OFF” POSITION
PRIOR TO INSPECTION OR SERVICING. FAILURE TO COMPLY WITH THIS SAFETY
PRECAUTION COULD RESULT IN SERIOUS INJURY OR DEATH.
Once the fan has been put into operation, a periodic maintenance program should be set up to preserve
the reliability and performance of the fan. Items to be included in this program are:
•
BEARINGS
•
SET
SCREWS
• BELTS
• MOTORS
• FASTENERS
• REMOVAL OF DUST/DIRT
Bearings
Bearings are the most critical moving part of the fan and should be inspected at periodic intervals.
Locking collars and set screws, in addition to fasteners attaching the bearing to the bearing plate, must
be checked for tightness. In a clean environment with temperatures above 32º F and below 200º F, fan
shaft bearings with grease fittings should be lubricated semi-annually using a high quality lithium based
grease. If unusual environmental conditions exist such as temperatures below 32º F or above 200º F,
moisture or contaminants, more frequent lubrication is required.
With the unit running, add grease very slowly with a manual grease gun until a slight bead of grease
forms at the seal. Be careful not to unseat the seal by over lubricating or using excessive pressure.
Bearings without grease fittings are lubricated for life.
Pre-Start-Up Checks
1. Check all fasteners for tightness.
2. The wheel should be aligned as shown. Although the wheel position is preset and the unit is test run
at the factory, movement may occur during shipment.
The radial gap should be consistent at all
locations between the centrifugal wheel and
the inlet cone. Centering may be accomplished
by loosening the inlet cone bolts and
repositioning the inlet cone.
To obtain the optimum performance, the
centrifugal wheel must overlap the inlet cone.
Adjustments can be made by loosening the set
screws in the wheel and moving the wheel to
the desired position.
3. Wheel rotation should be in the same direction as the rotation decal affixed to the unit. For 3-phase
installations, fan rotation can be reversed by simply interchanging any two of the three electrical
leads. For single phase installations, follow the wiring diagram located on the motor.
4. Adjustable motor pulleys are preset at the factory for the specified fan RPM. Fan speed can be
increased by closing or decreased by opening the adjustable pulley. Two or three groove variable
pitch pulleys must be adjusted an equal number of turns open or closed.
Note: Any increase in fan speed represents a substantial increase in horsepower required from
the motor. Always check motor load amperage and compare to nameplate rating when
changing fan speed.
Wheel
Inlet Cone
Radial Gap
Overlap
Direction
of Airflow
MOTOR
PLATE
MOTOR
COVER
(OPTIONAL)
BEARING
SUPPORT
Side View
Top View
MOTOR
MOTOR
PULLEY
BELT
BELT
TUBE
SHAFT
PULLEY
BEARING
COVER
BEARINGS
SHAFT
INLET CONE
(VENTURI)
WHEEL
#469003 Vektor-H IOM
Rev. 2, August 2006
Copyright © 2006 Greenheck Fan Corp.
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.
As a result of our commitment to continuous improvement,
Greenheck reserves the right to change specifications without notice.
®
Belt Span
Deflection =
Belt Span
64