SPX Cooling Technologies Fan HP7I User Manual

Marley HP7i Fan 72" thru 168" Diameter – 6 Blade  
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User Manual 92-1471E  
 
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±14°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.  
3
 
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  
specifiedrateofwaterowingoverthetowerafterthemotorandGeareducer  
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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