SPX Cooling Technologies HP7I User's Manual
Contents
1. Marley HP7i Fan 72 thru 168 Diameter 6 Blade User Manual 92 1471E aM Marley FAN BLADE CAP SCREWS TORQUE 10 15 FT LBy 14 20 N M RESILIENT WASHERS HUB ASSEMBLY DENTIFICATION NUMBER CAP SCREWS TORQUE PROGRESSIVELY FAN HUB TO 30 35 FT LB 41 48 N M COVER DRAIN HOLES BALANCE HARDWARE HUB SOCKET My SET PITCH 2 Je FROM BLADE TIP Figure 1 Typical Fan Assembly Component appearance may vary MET EE FIT WITHIN THE HUB AFTER FITCH IS SET THE CAP SCREWS HOLD THE BLADE IN PLACE Marley Order No a oe Trial Pitch Angle Final Pitch Angle Speed RPM Contract hp 2 Note Blade Pitching 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 STRAIGHT EDGE BEVEL PROTRACTOR ROTATION PITCH ANGLE 5 Select a position on the fan circumference and rotate each blade to this common location when setting or checki2. S Actual Amperage HP Nameplate Horsepower DENSITY Actual Air Density DENSITY Design Air Density 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 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 A Caution 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 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 When contacting your Marley sales representative for repair or replacement 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 Marl
3. ey sales representative COOLING TECHNOLOGIES 7401 WEST 129 STREET OVERLAND PARK KANSAS 66213 UNITED STATES 913 664 7400 spxcooling ctspx com spxcooling com In the interest of technological progress all products are subject to design and or material change without notice 2009 SPX Cooling Technologies Inc Printed in USA Manual 92 1471E
4. ng 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 as illustrated Blades should be within 4 of the desired pitch After the de sired pitch is obtained progressively tighten blade cap screws to 30 35 ft lb 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 lb 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 I gt 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 VOLTS x AMPS x DENSITY HP x HP VOLTS x AMPS x DENSITY 7 HP Corrected Horsepower VOLTS Nameplate Volts VOLTS Actual Volts AMPS Nameplate Amperage AMP
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