Greenheck Fan Ventilation Hood RBU User Manual

PN 455700  
READ AND SAVE THESE INSTRUCTIONS  
Models RBU/RBUMO/RDU  
Upblast Propeller Roof Fans  
Belt Drive and Direct Drive  
GREENHECK  
P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410  
PH. 715-359-6171  
®
Installation, Operation and Maintenance Manual  
Greenheck Model RBU, RBUMO and RDU fans are thoroughly inspected and test run at  
the factory, however damage may occur during handling and shipping. Consequently, it  
is important that the unit be carefully inspected for visible and concealed damage before  
beginning installation. Report any damage to the shipper immediately. In  
addition, assure all accessory items are accounted for.  
INSTALLATION  
LIFTING  
Attach a suitable chain or strap to the four windband mounting brackets,  
which are designed to be used as lifting lugs (Fig. 1). Do not lift the  
fan by the motor, belt  
tube, damper frame,  
windband or  
accessories.  
Fig. 1  
Carefully lift the fan to  
the roof curb and install  
fasteners in all holes  
provided in the unit  
base. The windband  
does not need to be  
removed for the lifting  
operation.  
Lifting Lug  
SERVICE ACCESS  
MOTOR OUT OF AIRSTREAM  
Model RBUMO simplifies inspection and servicing with the “motor out  
of the airstream” design. A removable motor cover enables quick and  
easy access to the motor, belt, and drives from the roof deck (Fig. 2).  
Servicing of propeller and bearings can easily be accomplished by  
removing the fan panel/windband assembly from the fan base.  
REMOVABLE WINDBAND  
By removing the bolts from the four windband mounting brackets, the  
windband can be removed. With the windband removed, access to the  
fan can be gained through the butterfly dampers. This service feature  
applies to models RBU, RBUMO and RDU (Fig. 1).  
Fig. 2  
 
PRESTARTING CHECKS  
Check all fasteners and set screws for tightness. This is especially important for  
bearing set screws.  
The propeller should rotate freely and not rub on the fan panel venturi. Rotation  
direction of the propeller should be checked by momentarily turning the unit on.  
Rotation should be in the same direction as the rotation decal affixed to the unit  
or as shown in Fig. 4. 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.  
Airflow  
Airflow  
Rotation  
Rotation  
FOR BELT DRIVE FANS  
The adjustable motor pulley is 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. Any increase in fan speed represents a substantial increase in horsepower  
required from the motor. Always check motor load amperage and compare to name  
plate rating when changing fan speed.  
Fig. 4  
ROUTINE MAINTENANCE  
WARNING  
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.  
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:  
• BELTS  
Belt Span  
Deflection =  
64  
• BEARINGS  
• FASTENERS  
• SET SCREWS  
• LUBRICATION  
• REMOVAL OF DUST/DIRT  
Belt Span  
Fig. 5  
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  
1
way between pulley centers is /64" 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 (Fig. 5).  
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.  
WRONG  
WRONG  
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. See Fig. 6.  
WRONG  
CORRECT  
Fig. 6  
BEARINGS (For belt drive fans only)  
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 bearings to the bearing plate, must be checked for tightness. In a  
clean environment and temperatures above 32°F./below 200° F., fan shaft bearings with grease fittings  
should be lubricated semi-annually using a high quality lithium based grease. If unusual environmental conditions exist  
temperatures below 32°F./above 200°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.  
3
 
FASTENERS AND SET SCREWS  
Any fan vibration has a tendency to loosen mechanical fasteners. 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.  
LUBRICATION  
Refer to the paragraph on bearings for bearing lubrication. Many fractional horsepower motors installed on the smaller fans are  
lubricated for life and require no further attention. Motors equipped with oil holes should be oiled in accordance with the  
manufacturer’s instructions printed on the motor. Use a high grade SAE 20 machine oil and use caution not to over lubricate.  
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 propeller blades  
causing severe imbalance if left unchecked. The exterior surface of the motor, fan panel and entire propeller 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.  
DAMPER INSPECTION AND SERVICE  
CAUTION: Butterfly dampers on units supplied with optional spring lifter bars are under spring tension and will open  
forcefully if the fusible link is released. Butterfly dampers should be inspected for proper operation at each service interval.  
Check for freedom of movement and general condition of the damper blades and hinge rods.  
Belt Drive Fans Parts List  
Direct Drive Fans Parts List  
9
1
1
3
2
8
2
4
5
5
4
3
6
7
10  
1. Fan Panel  
2. Propeller  
1. Fan Panel  
2. Propeller  
3. Drive Frame Channel (2)  
4. Motor Plate  
5. Motor  
3. Drive Frame Channel (2)  
4. Motor Plate  
5. Motor  
6. Motor Pulley  
7. Shaft Pulley  
8. Fan Shaft  
9. Bearings (2)  
10. Belt  
11. Bearing Plate (Level 3 fans only - not shown)  
IOM RBU/RBUMO/RDU  
Rev. 2 December 2000  
Copyright © 2000 Greenheck Fan Corp.  
4
 

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