Fan Components Figure 1—Typical Fan Assembly Order No. _______________________________________ Trial Pitch Angle __________________________________ Final Pitch Angle _________________________________ Speed-rpm ______________________________________ Contract hp _____________________________________...
Fan Assembly Instructions The following instructions apply to installations having straight Note 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.
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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. INNER HUB BLADE SAFETY COLLAR Figure 3 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.
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Note (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.
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Bolt Torque Wrench Setting Diameter Model ft·lb N·m ƒ Table 6 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. •...
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Motor Load The corrected horsepower should be close to but not exceed the con- tract 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).
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