Marley HP7i Fan 72" thru 168" Diameter – 6 Blade
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User Manual 92-1471E
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Assembly
1. Visually inspect all tapped blade mounting holes for any debris which
could cause problems when tightening cap screws.
2. Install blades with rotation arrow on top side and pointing in a clockwise
direction.
3. Hold each blade level and tighten the six cap screws just enough to hold
the blade level.
4. Do not torque cap screws. Blades must be free to turn in retaining ring
to adjust pitch.
The trial pitch angle is the calculated setting for design conditions
(water rate, heat load, air density, and brake horsepower). The trial
blade pitch is provided on page 2.
Note
AIR
FLOW
STRAIGHT
EDGE
BEVEL
PROTRACTOR
PITCH ANGLE
ROTATION
1/4°
Blade Pitching
5. Select a position on the fan circumference and rotate each blade to this
common location when setting or checking blade pitch. All blades must
be pitched with the blade axis pointing in the same direction. Support
the blade tip to maintain the proper plane of rotation while setting the
fan pitch.
6. Set the pitch angle and torque cap screws for each blade. Set the pitch
angle using a straight edge and bevel protractor 2" (51mm) from blade tip
asillustrated.Bladesshouldbewithin±1⁄4°ofthedesiredpitch.Afterthede-
siredpitchisobtainedprogressivelytightenbladecapscrewsto30-35ft·lbƒ
(41-47 N·m) torque. A crowfoot wrench may be necessary to torque cap
screws that cannot be reached with a socket.
7. Install hub cover using cap screws and resilient washers.
8. Tighten cap screws between 10 and 15 ft·lbƒ (14-20 N·m) torque.
Maintenance
Preventative maintenance will prolong useful life and assure continued
trouble-free operation. After the first week of operation and subsequently
at six month intervals:
1. Visually inspect the fan for airborne debris damage and corrosive at-
tack.
2. Torque blade cap screws.
3. Remove any accumulated scale or dirt.
4. Clear blade drain holes.
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Motor Load
1. The corrected horsepower should be close to but not exceed the contract
horsepower specified (see page 2). Determine corrected horsepower
with this equation:
VOLTSA × AMPSA × DENSITYD
× HPN
HPC
=
VOLTSN × AMPSN × DENSITYA
HPC
=
=
=
=
Corrected Horsepower
Actual Volts
VOLTSN
AMPSN
HPN
=
=
=
=
Nameplate Volts
VOLTSA
AMPSA
DENSITYA
Nameplate Amperage
Nameplate Horsepower
Design Air Density
Actual Amperage
Actual Air Density
DENSITYD
Actual volts and amperage must be obtained with the fan running and the
specifiedrateofwaterflowingoverthetowerafterthemotorandGeareducer
have reached operating temperature (approximately 30 minutes of opera-
tion).
2. The blade pitch can be changed to obtain contract horsepower. A one
degree pitch change will change the power about eight horsepower. If
blades are repitched, follow pitching and fastener tightening instructions
detailed in the Fan Assembly section of this manual.
Measurements taken on motors operating with Variable Frequency
Drive controls may read up to 15% high from errors in measuring the
approximatedsinewave. Instrumentscapableofmeasuringasquared
off wave form accurately should be used for measuring power in this
situation.
Caution
When checking and/or changing blade pitch or cycling fan in normal
operation, do not exceed 30 sec/hour total motor starting time as mo-
tor may be overheated.
Service
WhencontactingyourMarley sales representative forrepair orreplacement
parts, please refer to the tower serial number.
Replacement blades can be installed without rebalancing. The fan series—
HP7i—and diameter are required when ordering replacement parts.
If rebalancing is required, return the fan hub to Marley for factory rebal-
ance. Obtain a Customer Return Material tag from your Marley sales
representative.
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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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©2009 SPX Cooling Technologies, Inc. Printed in USA
Manual 92-1471E
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