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USER MANUAL
Marley X7 Fan
DESIGNED FOR INDUCED-DRAFT COOLING TOWER APPLICATIONS
M2010-1234A IS SU ED 3/2012 READ AND U NDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT.
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Fan Components
1
2
3
4
Figure 1—Typical Fan Assembly
2
Order No. _______________________________________
Trial Pitch Angle __________________________________
Final Pitch Angle _________________________________
Speed-rpm ______________________________________
Contract hp _____________________________________
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Note
Fan Assembly Instructions
The following instructions apply to installations having straight
bores or tapered output shafts without split taper bushings.
It is convenient to preassemble the fan prior to installation on
the driving shaft.
Marley X7 fans are statically balanced as a complete assembly. If
fan is shipped unassembled, blades and hubs are match-marked
to insure proper re-assembly.
1—Select a large open area corresponding to the fan diameter.
2—Position the fan hub 1 in the center of the work area with the blade
sockets up.
3—Place a blade 2 in a blade socket on the hub. 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.
4—Ensure the blade shank safety collar is inboard of the inner hub rim.
Refer to Figure 3.
Figure 2
TRAILING
EDGE
LEADING
EDGE
5—Lubricate U-bolt threads and bearing surface of self-locking nuts.
Install U-bolt through inner row of holes in the hub. Finger tighten the
self-locking nut with flat washer onto U-bolt threads. Progressively
tighten each leg of the U-bolt until blade is held in place.
6—Pull blade radially outward to be certain the shank safety collar is in
contact with hub inner ring. Refer to Figure 3.
7—Repeat steps 5 and 6 as required with the outer U-bolt 4.
8—Repeat steps 3 through 7 for all blades.
➠
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9—Progressively tighten each side of the U-bolt until the blades are
barely able to move when twisting the blade.
Figure 3
BLADE
SAFETY COLLAR
Fan Installation Instructions
INNER HUB
RIM
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 1/8″ (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 engagement 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
4
(54 N·m).
ƒ
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Note
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).
1–Select a position on the fan circumference and rotate each blade to
this common location when setting or checking blade pitch. Support
the blade tip to maintain a common rotation plane while setting the fan
pitch. The pitch is set by placing a protractor on top of a straight edge
or with a digital level that extends across blade near the tip. For flare-tip
blades, the pitch is measured across the end cap as shown in Figure 4.
For full chord blades, the pitch is measured across the aluminum airfoil
about 1” inboard of the end cap as shown in Figure 5.
2–Be sure all blades are positioned correctly on hub, then set the pitch.
Blades should be within ± 1/4° of the desired pitch angle. After the desired setting is obtained, progressively tighten the U-bolt nuts according
to Table 6. 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
Figure 5
SETTING PITCH ON
FLARE-TIP BLADE
(LEVEL PLACED ACROSS END CAP)
SETTING PITCH ON
FULL CHORD BLADE
(LEVEL PLACED ACROSS AIR FOIL)
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Table 6
Fan
Model
X71 12 40 54
X72 16 70 95
Bolt
Diameter
mm
Torque Wrench Setting
ft·lb
ƒ
N·m
Fan Maintenance
Preventative maintenance will prolong useful life and assure
continued 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.
Replacement of individual fan blades may require 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 horsepower
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 and
Geareducer have reached operating temperature (approximately 30
minutes of operation).
Note
HP
C
VOLTS
AMPS
DENSITY
A
A
HP
= Corrected Horsepower
= Actual Volts
= Actual Amperage
= Actual Air Density
A
VOLTSA × AMPSA × DENSITY
=
C
VOLTSN × AMPSN × DENSITYA
VOLTS
AMPS
HP
N
DENSITY
D
× HP
N
= Nameplate Volts
N
= Nameplate Amperage
N
= Nameplate Horsepower
= Design Air Density
D
Measurements taken on motors operating with Variable Frequency Drive controls may read up to 15% high from errors in
measuring the approximated sine wave. Instruments capable
of measuring a squared off wave form accurately should be
used for measuring power in this situation.
Do not start the motor more than four to five times per hour
(each low speed start and each high speed start count as one
start).
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Marley X7 Fan
DESIGNED FOR INDUCED-DRAFT
COOLING TOWER APPLICATIONS
SPX COOLING TECHNOLOGI ES, INC.
7401 W 129 ST
OVERLAND PARK, KANSAS USA
P: 913 664 7400
F: 913 664 7439
spxcooling@spx.com
spxcooling.com
In the interest of technological progress, all products are subject to design and/or material change without notice
ISSUED 3/2012 M2010-1234A
COPYRIG HT © 2012 SPX Corporation
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