Greenheck Fan Blower 47555 User Manual

PN 47ꢀ555  
®
Centrifugal Laboratory Exhaust  
Installation, Operation and Maintenance Manual  
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the  
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions  
could result in personal injury and/or property damage! Retain instructions for future reference.  
Vektor-CD  
Direct or Belt Drive  
The Vektor-CD fan is a side inlet centrifugal blower  
by  
with a high plume dilution nozzle designed for  
laboratory exhaust systems. Available in either direct  
or belt drive configurations, the Vektor-CD is capable  
of up to 14 inches wg of static pressure and 100,000  
cfm and can be constructed to AMCA spark B or  
C specifications. All fans are AMCA 210 and 260  
certified for flows as well as AMCA 300 for sound. The  
Vektor-CD is available in 15 sizes ranging from 12 to  
66 inch wheels. Each fan has a permanently affixed  
manufacturer’s engraved metal nameplate containing  
the model number and individual serial number.  
General Safety Information  
Only qualified personnel should install this fan system.  
Personnel should have a clear understanding of these  
instructions and should be aware of general safety  
precautions. Improper installation can result in electric  
shock, possible injury due to coming in contact with  
moving parts, as well as other potential hazards.  
Other considerations may be required if high winds  
or seismic activity are present. If more information  
is needed, contact a licensed professional engineer  
before moving forward.  
1. Follow all local electrical and safety codes, as well  
as the National Electrical Code (NEC), the National  
Fire Protection Agency (NFPA), where applicable.  
Follow the Canadian Electric Code (CEC) in  
Canada.  
2. The rotation of the wheel is critical. It must be free  
to rotate without striking or rubbing any stationary  
objects.  
3. Motor must be securely and adequately grounded.  
4. Do not spin fan wheel faster than maximum  
cataloged fan rpm. Adjustments to fan speed  
significantly effects motor load. If the fan RPM is  
changed, the motor current should be checked to  
make sure it is not exceeding the motor nameplate  
amps.  
DANGER  
Always disconnect power before working on or  
near a fan. Lock and tag the disconnect switch or  
breaker to prevent accidental power up.  
5. Do not allow the power cable to kink or come in  
contact with oil, grease, hot surfaces or chemicals.  
Replace cord immediately if damaged.  
6. Verify that the power source is compatible with the  
equipment.  
CAUTION  
When servicing the fan, motor may be hot enough  
to cause pain or injury. Allow motor to cool before  
servicing.  
7. Never open access doors to a duct while the fan is  
running.  
CAUTION  
Precaution should be taken in explosive  
atmospheres.  
Vektor-CD Centrifugal Laboratory Exhaust  
 
REMOVING FROM STORAGE  
Vektor-CD Arrangements  
As fans are removed from storage to be installed  
in their final location, they should be protected and  
maintained in a similar fashion, until the fan equipment  
goes into operation.  
Prior to assembly and installation of the Vektor fan  
and system components, inspect the fan assembly to  
make sure it is in working order.  
Vektor-CD  
Single Fan System  
Vektor-CD  
Opposed Fan System  
1. Check all fasteners, set screws on the fan, wheel,  
bearings, drive, motor base and accessories for  
tightness.  
2. Rotate the fan wheel(s) by hand and assure  
no parts are rubbing. Access to the wheel is  
obtained through a bolted panel located on the  
side of the fan housing.  
3. Ensure proper wheel settings for radial gap and  
alignment. Refer to page 13.  
Installation  
Vektor-CD  
Vektor-CD  
Installations with inlet or discharge configurations that  
deviate from this standard may result in reduced fan  
performance. Restricted or unstable flow at the fan  
inlet can cause pre-rotation of incoming air or uneven  
loading of the fan wheel yielding large system losses  
and increased sound levels.  
Dual Fan System  
Triple Fan System  
Rigging / Assembly Instructions  
1. Use standard lifting and rigging practices.  
System Identification Tags  
2. All lifting lugs on each component must be utilized  
at the same time.  
3. Plenum, blower, and windband are to be kept level  
during installation.  
Vektor fan systems may arrive in component pieces  
due to shipping restrictions. Individual components  
of a system have matching identification tags  
which should be used to identify and assemble the  
complete system.  
Chains  
Assembling systems  
with different  
identification tags  
can cause reductions  
Spreader Bar  
Chains  
Lifting  
Lugs  
in the fan(s)  
performance.  
Lifting  
Lugs  
Standard Fan Configurations  
The following illustration identifies a typcial  
configuration of the Vektor-CD system. Greenheck  
also supplies custom configurations. Your system  
may not be depicted in the drawing shown. Refer to  
submittal drawing.  
Bypass Air  
Plenum  
Gasketing  
Roof Curb / Structural Support  
WINDBAND  
FLEX CONNECTOR  
ISOLATION  
DAMPER  
NOZZLE  
PLENUM  
FAN  
FH  
FL  
FW  
OPTIONAL  
CURB SQR  
ROOF CURB  
PRIMARY INLET  
ISOLATOR  
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Curb Installations  
Bases—Foundation and Isolation  
Greenheck supplies gasketing material for all multi-  
section curbs and/or plenums. Install gasketing prior  
to bolting split curbs and or plenums together.  
Critical to every fan installation is a strong, level  
foundation. A reinforced poured concrete pad with  
a structural steel base or inertia base provides an  
excellent foundation. Structural bases must be sturdy  
enough, with welded construction, to prevent flexing  
and vibration.  
NOTE: Steel, concrete or wood support is per  
structural engineer and in accordance with load  
requirements and applicable building codes.  
To eliminate vibration and noise from being transferred  
to the building, vibration isolators should be used.  
The fan is mounted directly on the isolation base and  
must be supported for the entire length of the fan base  
angle (Refer to the installation manual for structural  
bases if the base was supplied by Greenheck).  
Isolators are installed between the isolation base and  
the foundation.  
Structural Steel  
Greenheck Roof Curb  
for Vektor Systems  
Continuous Weld or Stitch Weld  
6 in. minimum stitch weld x 3-1/4 in. spacing  
Minimum 6 in. weld on each corner.  
(hardware by others)  
After the fan, isolation base and isolators are installed,  
the entire assembly must be leveled. Position the level  
on the isolation base, not the fan shaft, for proper  
leveling. Additionally, the motor and fan shafts must  
be level and parallel relative to each other for proper  
alignment.  
Steel structural support  
(by others)  
Concrete Deck  
Greenheck Roof Curb  
for Vektor Systems  
Install 1/2 in. bolt  
5-1/2 in. maximum bolt spacing  
4 in. maximum spacing from curb corners  
(hardware by others)  
Concrete structural support  
(by others)  
Wood Deck  
Greenheck Roof Curb  
for Vektor Systems  
Install 1/2 in. lag or thru-bolt  
(as determined by structural engineer)  
with 1 in. washer in each hole shown above  
(hardware by others)  
Wooden structural support  
(by others)  
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Riser Installation  
Plenum Assembly  
Check curb or structural supports for levelness. Both  
must be level to ensure proper drainage from plenum  
and fan(s).  
Note: Gasketing material (shipped with fan) should  
be placed on the top edge of already installed roof  
curb prior to placing the plenum or individual plenum  
sections on the curb.  
If the plenum is shipped disassembled, the plenum  
sections can be assembled together into one single  
piece before lifting onto the roof and then fitted on  
the roof curb / support structure, or each section can  
be placed on individually. The method used would be  
dependent on the lifting capacity for the equipment  
on-site. If moving each piece separately onto the  
roof curb or support structure, each section should  
be joined to its mating part before moving another  
section into place.  
Lab Exhaust Riser  
Riser duct(s) run up through the curb and are  
flanged over the curb. (by contractor)  
Roof Curb—anchor curb to roof  
deck structure in accordance with  
project construction documents  
and local codes.  
For a 1x1 system there is only a single plenum section  
and no multiple plenum assembly would be required.  
Determine the placement of the plenum  
sections relative to each other  
(Multiple Fan Systems)  
When looking at the individual section one will notice  
that each plenum section is missing at least one  
side panel. These areas are the locations where the  
sections are to be joined together. If you have two  
plenum sections, then each one would be missing a  
side panel. If you have a three-fan system, there are  
three plenum sections. The two end plenum sections  
would each be missing one side panel and the middle  
section would not have panels on two sides. Please  
refer to the submittal drawing for the orientation of  
any Bypass Air Plenum (BAP) dampers or air inlet  
locations.  
Plenum Isometric View  
Putting the plenum together  
After identifying the plenum sections arrangement  
order, one of the two mating sections has weld nuts  
on the inside of the plenum. The assembly hardware  
(stainless steel bolts) required to join the sections  
is located here for shipping purposes. These bolts  
should be removed and set-aside prior to placing the  
mating sections together. The bolts are located every  
6 to 10 inches to provide the best seal between the  
mating sections.  
Before moving the sections into position, gasketing  
must be installed to seal the plenum sections against  
leakage. This silicone gasketing is supplied with  
the fans and only needs to be applied to one of the  
two mating plenum sections. The bands or strips of  
gasketing should be attached around the perimeter of  
the joining face and with an additional strip making a  
triangular area in each corner.  
For side inlet fans, remove panel at end of plenum.  
This opening is the designed connection spot for user  
connected ductwork from building.  
After the gasketing has been attached and the  
hardware has been removed, place the two mating  
sections together. The stainless steel bolts, which  
were set aside earlier, are now run first through the  
holes of the plenum section without the weld nuts and  
tighten into the weld nuts on the other plenum section.  
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Plenum and Curb to Structural Steel  
Plenum Assembly continued  
An additional side (or access) panel may need to be  
removed in order to gain access to the inside of the  
plenum assembly. The bolts should be tightened in  
an even and consistent manner as to pull the two  
sections together and compress the gasketing.  
516 in. bolt  
(typical)  
(by Greenheck)  
Weatherhood  
with birdscreen  
(optional)  
Bypass Air  
Plenum  
After the plenum is assembled  
Use all provided hardware to tighten and join the  
mating sections together. Any side panels removed  
to gain access to the interior of the plenum should be  
reattached. The assembled plenum has holes in the  
curb cap to fasten the plenum to the already installed  
roof curb.  
316 in. silicone gasket  
(by Greenheck)  
3
8  
in. bolt  
(typical)  
(by Greenheck)  
Fiberglass  
Insulation  
Bolt or weld in field  
(by others)  
Roof Curb  
The plenum is now ready to have gasketing placed in  
the mounting location between the plenum and the  
fan. After the gasketing has been attached the fans  
can be lifted and set into place.  
Structural Support  
(by others)  
Modular Plenum  
Isometric View  
Plenum (no Curb) to Channel Base  
516 in. bolt  
(typical)  
Lifting Lugs  
(by Greenheck)  
Weatherhood  
with birdscreen  
(optional)  
Bypass Air  
Plenum  
316 in. silicone gasket  
(by Greenheck)  
Drain hole  
1 in. coupling  
Field drilled & bolted  
(by others)  
Bolted and gasketed  
access panels  
Structural Support  
(by others)  
Plenum Installation  
The figures depicted illustrate three common methods  
used to install Vektor-CD bypass plenums. Methods  
used to attach a Vektor unit are dependent on local  
codes, roof construction design and roof construction  
materials. Consult an architect or structural engineer  
for proper means of attachment.  
Fan, Plenum, and Curb to Roof Deck  
516 in. self-tapping screws  
(by Greenheck)  
Place 1/2 inch thick x 1/2 inch wide silicone gasket  
around the perimeter of top edge of curb, adhesive  
side down (gasket provided in Vektor-CD hardware kit).  
Weatherhood  
with birdscreen  
(optional)  
Bypass Air  
Plenum  
To align holes properly, the plenum needs to be  
centered on the curb.  
316 in. silicone gasket  
(by Greenheck)  
When holes are provided in the curb, install 316  
stainless steel screws (provided) in all holes. Use anti-  
seize gel (provided) to prevent galling / welding of all  
stainless steel fasteners.  
3
8
in. bolt  
Fiberglass  
Insulation  
(typical)  
(by Greenheck)  
Roof Curb  
Bolt or weld in field  
(by others)  
When holes are not provided in the curb (non  
Roof Line  
(Roofing felt  
& material  
by others)  
Greenheck curb): Drill 0.28 in. diameter holes in curb  
using bypass air plenum holes as a template. Install  
5/16 in. self-tapping screws (provided) in all the holes.  
Exhaust Duct  
(by others)  
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Fan Installation  
Fan Housing Installation  
Windband Installation  
Using the windband  
lifting lugs, place  
Four (4) lifting  
lugs located  
at top of  
Lines of attachment  
are to be lifted in the  
vertical direction to  
prevent damage.  
Spreader bars  
windband over blower  
discharge, aligning  
windband support  
bracket holes with  
bolt holes in blower  
housing. Attach  
windband  
are recommended.  
windband to blower  
discharge using 316  
stainless steel bolts  
Lifting lugs located on the  
(provided) through support brackets welded to the  
inside of the windband. Use anti-seize gel (provided)  
to prevent galling / welding of all stainless steel  
fasteners.  
four corners of the base  
If the windband is shipped attached to the fan housing  
or if the windband is secured to the fan housing  
prior to mounting to the plenum, the fan / windband  
assembly should be lifted by the lifting lugs located  
on the fan housing. Do not lift this assembly by the  
lifting lugs located on the windband. Connect fan  
to plenum using Excelon™ flex connector found in the  
Vektor-CD hardware kit.  
Bypass Air Plenum Installation  
Span determines the number of lifting lugs to be used  
during installation:  
Lifting lugs located at top  
of bypass air plenum  
Span  
Fan Stack Installation  
**Guy wire attachments  
Span  
No. of Lifting Lugs  
Minimum of 4 lifting lugs  
Minimum of 6 lifting lugs  
Minimum of 8 lifting lugs  
12 inches or less  
12 to 18 inches  
18 inches or greater  
Stack Extension  
Fan Assembly  
Guy Wire Locations  
If fan requires a stack or stack extension, install on  
fan before installing nozzle and windband. Place  
gasketing between any sections, blower housing and  
initial stack. Use lifting lugs to position each piece  
into place. Attach stack or stack extension to blower  
housing using 316 stainless steel bolts (provided)  
through flanges aligning bolt patterns. Use anti-  
seize gel (provided) to prevent galling/welding of all  
stainless steel fasteners.  
1-1/4 inch thru-hole typical  
NOTE: Guy wires to be supplied by others. Fastening to  
building structure to be provided and engineered by others.  
If your fan requires stack extensions, the use of guy  
wires is recommended. See drawing for guy wire  
connection locations.  
Greenheck strongly recommends the use of guy  
wires on any system that incorporates the usage  
of a stack extension including inline attenuators.  
Subsequent guy wires are to be designed and  
installed by others.  
Note: Keep 36 inches minimum spacing around unit  
to provide adequate clearance for servicing or  
repairing unit.  
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Duct Connections to the Bypass Air  
Plenum (BAP)  
Plenum and Fan Drainage Piping and  
Trap Detail (by others)  
There are multiple locations for pipe connections, one  
on each plenum section, and another on each tubular  
fan housing located at the bottom of the scroll. Each  
drain should be properly connected to a drainage  
system to ensure proper disposal of any water or  
condensate that may occur.  
Connecting primary exhaust air ducts is allowed  
through the roof curb or through one or more of the  
side access panels. To reduce the potential for system  
effects in the plenum, the duct connection should  
be sized to have a maximum air velocity of 1500 fpm  
when entering. When attaching ductwork to the  
plenum, care should be taken to ensure a tight fit and  
proper seal to prevent leakage of the contaminated  
airstream.  
• Installed piping to have a downward angle to  
allow for drainage  
• Fill trap to recommended level before start-up  
Ductwork that is a different size than the removable  
access panel can either use a transition to the  
plenum’s opening size, or the access panel can be  
field modified by cutting an opening to the size of the  
ductwork.  
Detail of bypass air  
plenum and blower  
housing  
1 in. drain coupling in blower  
housing and bypass air plenum  
Vektor Field Coating Repair Procedure for  
Scratched Areas  
Standard coating and color for the Vektor laboratory  
exhaust system is Greenheck’s Hi-Pro Polyester Gray  
(041).  
The procedure below details the correct method for  
repairing minor scratches in the coating. Each Vektor  
unit is supplied with a repair kit for use after the initial  
installation.  
Y
X
1 inch of water  
The kit includes:  
• 1 pint Kem Kromik® Universal Metal Primer  
• 1 pint industrial enamel (Industrial 041 Gray)  
• 4 disposable foam brushes  
• 1 sheet of sandpaper  
• 2 tech data sheets for the two paints  
• 1 repair procedure.  
Clean out location  
Y Dim ≥ System Pressure  
X Dim ≥ 1/2 System Pressure  
Dimension of X and Y are inches.  
1. Scuff affected area to be repaired using medium  
sandpaper (provided). Feather the edges.  
Note: Refer to local codes for proper disposal of  
potential hazardous drainage.  
2. Clean affected area to be touched up using an  
alkaline based cleaner and rinse.  
3. Apply Kem Kromik® primer using the 1 inch foam  
brush (provided). Follow technical data sheet  
instructions.  
Bypass Air Plenum (BAP), Isolation  
Damper Access & Actuator Mounting  
Depending on the configuration and intended  
operation of the system supplied, every Vektor plenum  
section may not have a weatherhood and bypass air  
damper. Typically systems that include a fan which  
is on standby will have one less weatherhood and  
BAP damper assembly than plenum sections. Refer  
to submittal drawings for additional information. The  
appropriate guard / cover needs to be removed for  
installation, inspection and maintenance.  
4. Allow primer to dry a minimum of 2-1/2 hours  
before top coating.  
5. Topcoat with Industrial enamel using 1 inch foam  
brush (provided). Follow technical data sheets  
instructions. Allow painted units to air-dry and  
cure before putting into service. See enclosed  
Technical Data sheets for detailed drying and  
cure schedules at different temperatures.  
For Vektor Fans with a Weatherhood  
To order additional coating repair kits please reference  
Greenheck’s part number, HAZ2037 HI-PRO GRAY  
FIELD DAMAGE REPAIR KIT. Please contact factory  
with your fan’s serial number for colors other than our  
standard Gray (041).  
Access to the bypass air plenum damper and the  
isolation damper, actuator(s) (optional from factory),  
and voltage transformer (optional from factory) is  
gained through the removal of the weatherhood  
guard / cover. The isolation damper assembly can be  
removed from its location by unbolting the frame from  
the plenum and removing the flex connector.  
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For Vektor Fans without a Weatherhood  
A guard / cover is located on the side of the plenum  
section. Removal of the guard / cover gains access to  
the damper linkages, actuator (optional from factory)  
and transformer (optional from factor). The entire  
bypass damper assembly can be removed through  
this opening. The isolation damper assembly can be  
removed from its location by unbolting the frame from  
the plenum and removing the flex connector.  
If the Vektor units were not supplied with optional  
actuators, the dampers have an extended jackshaft  
for field mounting a customer supplied actuator.  
Motor Disconnect Wiring &  
Isolation Damper Wiring Diagram  
LINE IN  
Disconnect is mounted to fan housing.  
208/230/460/575 V  
Transformer is mounted to bypass air plenum  
near isolation damper actuator motor. For  
systems that ship un-assembled because of  
physical size, this connection at disconnect  
from transformer must be field installed.  
Wires with conduit and fitting are provided  
pre-connected to transformer.  
3 PHASE  
DISCONNECT  
OPTIONAL ISOLATION  
DAMPER CONTROL  
208/230/460/575 V  
3 PHASE  
TRANSFORMER  
208/230/460/575 V  
1 PHASE  
24/115 V  
1 PHASE  
ISOLATION DAMPER  
ACTUATOR MOTOR  
MOTOR  
208/230/460/575/60/3  
POWER OPEN/SPRING CLOSE  
NOTE: If a Variable Frequency Drive is used to control fan speed,  
transformer and actuator will not function properly when wired as  
shown. Transformers must be wired independently from VFD control.  
FIELD WIRING  
FACTORY WIRING  
Applications with Variable Frequency  
Drives (VFD)  
For Vektor systems with single-point, three-phase  
wiring per blower, the isolation damper actuator will  
be powered via a step-down transformer, which is  
wired to the fan disconnect, as shown in the diagram  
above.  
If fan flow (motor speed) is to be controlled using a  
VFD, the reduced voltage and frequency supplied to  
the fan will cause control problems with the isolation  
damper actuator.  
When a Vektor control sequence requires the use of a  
VFD, it is suggested that the control contractor supply  
the isolation damper actuator voltage — independent  
of the power supplied to the Vektor fan motor.  
Isolation Damper Control  
Isolation dampers on de-energized fans are to be  
closed to maintain system negative pressure and  
prevent reverse “free-wheeling” of de-energized  
blower(s). Isolation dampers shall be opened  
immediately upon fan energizing.  
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leads. Single phase motors can be reversed by  
changing internal connections as described on  
the motor label or wiring diagram.  
Unit Start-Up  
WARNING  
2. If the fan has inlet vanes, they should be partially  
closed to reduce power requirements. This is  
especially important if the fan is designed for a  
high temperature application and is being started  
at room temperature.  
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.  
3. Fans with multi-speed motors should be checked  
on low speed during initial start-up.  
1. Disconnect and lock-out all power switches to  
fan.  
4. Check for unusual noise, vibration or overheating  
of bearings. Refer to the “Troubleshooting”  
section of this manual if a problem develops.  
2. Check for bearing alignment and lubrication.  
3. Check the V-belt drive for proper alignment and  
tension (belt drive).  
5. Grease may be forced out of the bearing seals  
during initial start-up. This is a normal self-  
purging feature of this type of bearing.  
4. Check rigid coupling for proper alignment and  
connect between motor shaft and fan shaft  
(direct drive).  
Vibration  
5. Check all guarding to ensure that it is securely  
attached and not interfering with rotating parts.  
Excessive vibration is the most frequent problem  
experienced during initial start-up. Left unchecked,  
excessive vibration can cause a multitude of  
problems, including structural and/or component  
failure. The most common sources of vibration are  
listed below.  
6. Check operation of isolation and bypass dampers  
(if supplied) for freedom of movement.  
7. Check all electrical connections for proper  
attachment.  
8. Check housing and ductwork, if accessible,  
for obstructions and foreign material that may  
damage the fan wheel.  
• Wheel Unbalance  
• Drive Pulley Misalignment  
• Incorrect Belt Tension  
• Bearing Misalignment  
• Mechanical Looseness  
• Faulty Belts  
9. Fill drainage piping trap.  
10. Check all fasteners, set screws and locking  
collars on the fan, bearings, drive, motor base  
and accessories for tightness.  
Many of these conditions can be discovered by  
careful observation. Refer to the troubleshooting  
section of this manual for corrective actions. If  
observation cannot locate the source of vibration,  
a qualified technician using vibration analysis  
equipment should be consulted. If the problem is  
wheel unbalance, in-place balancing can be done  
through the access panel located on the side of each  
fan’s tubular housing. Any correction weights added  
to the wheel should be welded to either the wheel  
back (single-plane balance) or to the wheel back and  
wheel cone (two-plane balance).  
11. Rotate the fan wheel by hand and assure no parts  
are rubbing.  
Additional steps for initial start-up  
1. Check for proper wheel rotation by momentarily  
energizing the fan. Rotation is always determined  
by viewing the wheel from the drive side and  
should correspond to the rotation decal affixed to  
the unit.  
Greenheck performs a vibration test on all centrifugal  
fans before shipping. Three vibration readings are  
taken on each bearing in the horizontal, vertical, and  
axial directions. The allowable maximum vibration  
for belt drive units is 0.10 in./sec. peak (0.08 in./sec.  
direct drive) velocity filter-in at the fan rpm per AMCA  
Standard 204. These vibration signatures are a  
permanent record of how the fan left the factory and  
are available upon request.  
Centrifugal  
Backward Inclined  
Centrifugal  
Airfoil  
CW Rotation - always viewed from the drive side.  
One of the most frequently encountered problems  
with Centrifugal Fans are motors which are wired  
to run in the wrong direction. This is especially  
true with 3-phase installations where the motor  
will run in either direction, depending on how it  
has been wired. To reverse rotation of a 3-phase  
motor, interchange any two of the three electrical  
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Fan Operation  
Serviceable Components  
All fans should be run every thirty (30) days, or at least  
“bumped” every thirty days. It is preferred that each  
fan is run as this causes all electrical and mechanical  
components to get up to temperature, displacing any  
formed condensation, redistributes load on bearings,  
and redistributes grease in the bearings (motor and  
shaft bearings).  
Windband  
Nozzle  
Isolation  
Damper  
Bypass Air  
Plenum  
V-Belt Drives  
Fan Assembly  
V-belt drives must be checked on a regular basis  
for wear, tension, alignment and dirt accumulation.  
Premature or frequent belt failures can be caused by  
improper belt tension (either too loose or too tight)  
or misaligned sheaves. Abnormally high belt tension  
or drive misalignment will cause excessive bearing  
loads and may result in failure of the fan and/or motor  
bearings. Conversely, loose belts will cause squealing  
on start-up, excessive belt flutter, slippage and  
overheated sheaves. Either excessively loose or tight  
belts may cause fan vibration.  
Weatherhood  
Bypass  
Damper  
Roof Curb or Structural Support  
Routine Maintenance & Operation  
When replacing V-belts on multiple groove drives  
all belts should be changed to provide uniform  
drive loading. Use a set of matched belts whenever  
possible. Do not pry belts on or off the sheave.  
Loosen belt tension until belts can be removed by  
simply lifting the belts off the sheaves. After replacing  
belts, ensure that slack in each belt is on the same  
side of the drive. Belt dressing should never be used.  
Once the unit has been put into operation, a routine  
maintenance schedule should be set up to accomplish  
the following:  
1. Lubrication of bearings and motor.  
2. Bypass air dampers should be checked for  
freedom of operation and wear.  
3. Wheel, housing, bolts and set screws on the  
entire fan should be checked for tightness.  
Do not install new belts on worn sheaves. If the  
sheaves have grooves worn in them, they must be  
replaced before new belts are installed.  
4. Any dirt accumulation on the wheel or in the  
housing should be removed to prevent unbalance  
and possible damage.  
The proper tension for operating a V-belt drive is  
the lowest tension at which the belts will not slip at  
peak load conditions. Belts are adjusted by raising or  
lowering the motor pivot plate. For initial tensioning,  
the proper belt deflection halfway between sheave  
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 1 inch using moderate thumb  
pressure at mid-point of the drive. Check belt tension  
two times during the first 24 hours of operation and  
periodically thereafter.  
5. Inspect fan impeller and housing looking for  
fatigue, corrosion, or wear.  
CAUTION  
When operating conditions of the fan are to be  
changed—speed, pressure, temperature, etc.—  
consult Greenheck to determine if the unit can  
operate safely at the new conditions.  
Belt Span  
Deflection =  
64  
Belt Span  
Vektor-CD Centrifugal Laboratory Exhaust  
 
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Motors  
Service  
Motor maintenance is generally limited to cleaning  
and lubrication. Cleaning should be limited to exterior  
surfaces only. Removing dust and grease buildup on  
the motor housing assists proper motor cooling. Never  
wash-down motor with high pressure spray.  
V-Belt Drives  
The V-belt drive components, when supplied by  
Greenheck Fan Corporation, have been carefully  
selected for this unit’s specific operating condition.  
Caution: Changing V-belt drive components could  
result in unsafe operating conditions which may cause  
personal injury or failure of the following components:  
Greasing of motors is only intended when fittings are  
provided. Many fractional 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. When motor temperature does not  
exceed 104ºF (40ºC), the grease should be replaced  
after 2000 hours of running time.  
• Fan Shaft  
• Fan Wheel  
• Bearings  
• V-belt  
• Motor  
Direct drive systems have extended grease lines to  
lubricate the motor without removal of any guarding.  
V-Belt Drive Installation — Belt Drive  
1. Remove the protective coating from the end of  
the fan shaft using mineral spirits or another  
similar solvent. Check to ensure that the shaft is  
free of nicks and burrs.  
Bearings  
The bearings for Greenheck fans are carefully  
selected to match the maximum load and operating  
conditions of the specific class, arrangement, and  
fan size. The instructions provided in this manual  
and those provided by the bearing manufacturer will  
minimize any bearing problems. Bearings are the  
most critical moving part of the fan, therefore, special  
care is required when mounting them on the unit and  
maintaining them.  
2. Slide sheaves on shafts - do not drive sheaves on  
as this may result in bearing damage.  
3. Align fan and motor sheaves with a straight-edge  
or string and tighten.  
4. Place belts over sheaves. Do not pry or force  
belts, as this could result in damage to the cords  
in the belts.  
Greenheck Fan Corporation recommends bearings  
to be relubricated quarterly at a minimum. All  
Vektor-CD fans use Mobil Mobilith SHC 100 synthetic  
grease conforming to NCGI Grade 2. Never mix  
greases made with different bases. This will cause a  
breakdown of the grease and possible failure of the  
bearing. For specific information, contact the factory  
representative or the fan system submittals.  
5. Adjust the tension until the belts appear snug.  
Run the unit for a few minutes and allow the belts  
to “set” properly.  
6. With the fan off, adjust the belt tension by moving  
the motor pivot plate. When in operation, the  
tight side of the belts should be in a straight line  
from sheave to sheave with a slight bow on the  
slack side.  
Aligning sheaves with a straight edge  
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Bearing Replacement  
Inlet Cone to Backplate Distance  
Both drive bearings are accessible from the ground  
on all Vektor-CD fans. Whether direct or belt driven,  
the bearings, along with other serviceable drive  
components (belts, motors, sheaves) are accessible  
by removing the motor cover panel. Please contact  
Greenheck Fan Corporation for specific instructions  
on the replacement of the bearings specific for each  
Vektor-CD fan. Please include fan identification  
numbers with the request to ensure that proper  
instructions are received.  
“A” Dimension  
Unit Size  
(inches)  
1
12  
15  
18  
22  
24  
27  
30  
33  
36  
40  
44  
49  
54  
60  
66  
4
8
8
8
1
1
5
638  
71316  
858  
9716  
10916  
11716  
1234  
14316  
15916  
1718  
181316  
201516  
2278  
316  
1
4  
Note: Bearing replacement could require moving  
of fan wheel. See Radial Gap, Overlap & Alignment  
section to re-align wheel upon bearing reinstallation.  
1
3
3
3
3
3
1
1
1
1
4  
8
8
8
8
8
2
2
2
2
Radial Gap, Overlap & Wheel Alignment  
Efficient fan performance can be maintained by having  
the correct radial gap, overlap and wheel alignment.  
These items should be checked after the fan has been  
in operation for 24 hours and before start-up after the  
unit has been serviced.  
Radial gap is adjusted by loosening the inlet cone/  
ring bolts and centering the cone/ring on the wheel.  
If additional adjustment is required to maintain a  
constant radial gap, loosening the bearing bolts and  
centering the wheel is acceptable as a secondary  
option.  
Overlap is adjusted by loosening the wheel hub from  
the shaft and moving the wheel to the desired position  
along the shaft. The transition between the inlet cone  
and wheel should be as shown; there is a smooth feel  
to the profile when moving from one component to the  
other. Overlap on double width fans is set by having  
equal spacing on each side of the wheel.  
Overlap  
Wheel  
A
Inlet  
Cone  
Radial  
Gap  
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Troubleshooting  
Problem  
Cause  
Corrective Action  
Adjust wheel and/or inlet cone. Tighten wheel hub or  
bearing collars on shaft.  
Wheel rubbing inlet  
Tighten sheaves on motor/fan shaft. Adjust belt tension.  
Align sheaves properly (see procedure). Replace worn  
belts or sheaves.  
V-belt drive  
Excessive noise  
Replace defective bearing(s). Lubricate bearings.  
Tighten collars and fasteners.  
Bearings  
Clean all dirt off wheel. Check wheel balance, replace if  
necessary.  
Wheel unbalance  
Fan  
Check wheel for correct rotation. Check blade position  
of bypass air plenum (BAP) damper, increase fan speed.*  
Low CFM  
High CFM  
Duct system  
Fan  
Higher pressure than design. Filters need replacement.  
Decrease fan speed.  
Increase BAP damper blade open position. Resize  
ductwork. Access door, lters, dampers not installed.  
Duct system  
Change obstructions in system. Use correction factor  
to adjust for temperature/altitude. Adjust set point used  
to control BAP damper modulation. Resize ductwork.  
Clean filters/coils. Change fan speed.*  
Duct system has more  
or less restriction than  
anticipated  
Static pressure wrong  
High horsepower  
Fan  
Check rotation of wheel. Reduce fan speed.  
Resize ductwork. Check proper operation of isolation  
and bypass dampers. Check filters and access doors.  
Duct system  
Check fuses/circuit breakers. Check for switches turned  
off or disconnected. Check for correct supply voltage.  
Electrical supply  
Drive  
Fan doesn’t operate  
Overheated bearing  
Check for broken belts. Tighten loose pulleys.  
Assure motor is correct horsepower and not tripping  
overload protector.  
Motor  
Lubrication  
Mechanical  
Check for excessive or insufficient grease in the bearing.  
Replace damaged bearing. Relieve excessive belt  
tension. Align bearings. Check for bent shaft.  
Adjust tightness of belts. Replacement belts should be a  
matched set.  
Belts  
Check alignment of shaft, motor and pulleys. Adjustable  
pitch pulleys with motors over 15 hp are especially  
prone to unbalance. Check wheel balance, rebalance if  
necessary.  
Excessive vibration  
System unbalance  
*Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor and result in  
motor failure. Do not exceed the maximum cataloged rpm of the fan.  
Unit Identification  
The tag below is an example of an identification label on the fan. The information provides general details  
about the fan, as well as containing specific information unique to the unit. When contacting your Greenheck  
representative with future needs or questions, please have the information on this label available.  
Tags are mounted in an area which is clearly visible—usually on the side of the fan housing.  
Model — General description of fan  
®
S/N  
Serial Number assigned by Greenheck,  
which is a unique identifier for every unit  
MODEL  
S/N  
Mark — Customer supplied identification  
MARK  
Vektor-CD Centrifugal Laboratory Exhaust  
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Maintenance Log  
Date __________________ Time _____________ AM/PM  
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Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
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Warranty  
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of three years  
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 of 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.  
Greenheck Catalog Vektor-CD provides additional  
information describing the equipment, fan performance,  
available accessories, and specification data.  
AMCA Publication 410-96, Safety Practices for Users and  
Installers of Industrial and Commercial Fans, provides  
additional safety information. This publication can be  
®
471555 • Model Vektor-CD IOM, Rev. 1, February 2008  
Copyright 2008 © Greenheck Fan Corp.  
ꢀꢃ  
 

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