SPX Cooling Technologies Fan 03 11A User Manual

Cofimco Fan – Adjustable Hub  
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User Manual 03-11A  
 
Fan Assembly Instructions  
The following instructions apply to installations having straight  
bores or tapered output shafts without split taper bushings.  
Note  
It is convenient to preassemble the fan prior to installation on  
the driving shaft.  
1—Select a large open area corresponding to the fan diameter.  
2—Position the fan hub in the center of the work area with the center  
spool 101 oriented as shown in Figure 1.  
3—Secure blade retention sleeves 104 to the blade 200 using  
3
machine bolt V11 and locking nut X12. Tighten 8" nut X12 to  
40 ft·lb .  
ƒ
4—Position the blade clamp blocks 103 around the blade shank so  
that the blade 200 droops slightly downward when the blade clamp  
hardware is tight.  
TRAILING  
EDGE  
Figure 2  
LEADING  
EDGE  
5—Position the blade clamps and blade between the hub plates  
102 to align bolt holes. Loosely install 58" bolts VBA, flat washers  
W29 and self locking nuts X14 to secure blades. Finger tighten all  
5
8" nuts.  
6—On fans where the blades overlap at the hub be sure to have  
the leading edge under the trailing edge of the forward blade. Refer  
to Figure 2.  
7—Pull the blades radially outward until the blade retention sleeve  
bears against the back side of the blade clamp.  
3
 
8—Repeat steps 3 through 7 for all blades.  
9—Progressively tighten all blade clamp nuts X14 until the blades  
are barely able to move when twisting the blade.  
TIGHTEN BLADE  
RETENTION  
SLEEVE  
CLAMP BOLTS TO  
100 FT·LB LUBRICATED  
TIGHTEN RETENTION  
SLEEVE NUT TO  
40 FT·LB  
Figure 3  
10- Measure the final fan diameter. By using a different hole in the  
blade retention sleeves the fan diameter can be altered for the ap-  
propriate fit within the cylinder. 12" minimum clearance between all  
blade tips and the fan cylinder is recommended.  
Fan Installation Instructions  
1—Be sure motor is locked out.  
2—Clean the hub bore and driving shaft extension for the full length  
of the key.  
3—Insert the key in the keyway. The top of the key must be below  
the top of the shaft by not more than 18" (3 mm) . The key is a tight  
fit across the width and must never be altered.  
4—After cleaning, apply a coat of anti-seize compound to the en-  
gagement portion of the shaft.  
5—Raise the fan assembly above the shaft and slowly lower the  
hub onto the shaft with the keyways aligned. Make certain the key  
does not slide down during installation.  
6—Install the Hub Retention Cap Screw with Lock Washer. Torque  
hub retention cap screw to 40 ft·lb (54 N·m).  
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4
 
Adjusting Fan Blade Pitch  
The trial pitch is the calculated setting for design conditions  
(water rate , heat load, air density, and brake horsepower). The trial  
pitch is provided by SPX (see page 2).  
Note  
1–Select a position on the fan circumference and rotate each blade  
to this common location when setting or checking blade pitch. Sup-  
port the blade tip to maintain a common rotation plane while setting  
the fan pitch. The pitch is set 316" (5 mm) inboard of the blade tip  
by placing a protractor on top of a parallel sided straight edge that  
extends across blade width as shown in Figure 4.  
2–Be sure all blades are positioned correctly on hub, then set the  
1
pitch. Blades should be within  
4° of the desired pitch angle. After  
the desired setting is obtained, progressively tighten the hardware  
according to Table 5. Recheck the pitch angle. If required, loosen  
the hex nuts and reset the pitch as necessary until the proper pitch  
angle is obtained.  
Figure 4  
Torque Wrench Setting  
Bolt  
Diameter  
ft·lb  
N·m  
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3
8
"
"
40  
100  
55  
136  
5
8
Table 5  
5
 
Fan Maintenance  
Preventative maintenance will prolong useful life and assure contin-  
ued trouble-free operation. After the first week and subsequently  
at six month intervals:  
Torque all hardware to specifications referenced in this manual.  
• Visually inspect the fan for airborne debris damage, contact with  
fan cylinder segments, and corrosive attack. Correct any situations  
determined detrimental to fan operation.  
• Remove any accumulated scale or dirt.  
• Clear blade drain holes at fan tip.  
Service  
Proper identification of your fan is necessary to insure you receive  
correct replacement parts. The Marley cooling tower serial number  
can be used to determine the fan and any components installed and  
maintained as original equipment on a Marley cooling tower. Please  
provide the Marley sales representative the necessary information  
when ordering replacement fans or components.  
Blades can be replaced without rebalancing the entire fan.  
If rebalancing is desired, contact the Marley sales representative  
in your area.  
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Motor Load  
The corrected horsepower should be close to but not exceed the  
contract horsepower specified by SPX. Determine corrected horse-  
power using the following equation.  
Actual volts and amperage must be obtained with the fan running  
and the specified rate of water flowing over the tower after the motor  
andGeareducerhavereachedoperatingtemperature(approximately  
30 minutes of operation).  
VOLTS × AMPS × DENSITY  
D
A
A
HP  
=
× HP  
C
N
VOLTS × AMPS × DENSITY  
A
N
N
HP  
= Corrected Horsepower  
= Actual Volts  
VOLTS  
= Nameplate Volts  
C
N
VOLTS  
AMPS  
= Nameplate Amperage  
= Nameplate Horsepower  
A
N
AMPS  
= Actual Amperage  
HP  
N
A
DENSITY = Actual Air Density  
DENSITY = Design Air Density  
A
D
Measurements taken on motors operating with Variable Fre-  
quency Drive controls may read up to 15% high from errors in  
measuringtheapproximatedsinewave.Instrumentscapableof  
measuring a squared off wave form accurately should be used  
for measuring power in this situation.  
Note  
Do not exceed 30 sec/hour total motor starting time as motor  
may overheat.  
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7401 WEST 129 STREET OVERLAND PARK, KANSAS 66213 UNITED STATES 913 664 7400 [email protected] spxcooling.com  
In the interest of technological progress, all products are subject to design and/or material change without notice.  
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©2008 SPX Cooling Technologies, Inc. Printed in USA  
Manual 03-11A  
 

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