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WARNING: Before servicing or cleaning unit, switch power off at service panel and lock the service
disconnecting means to prevent power from being switched on accidentally. When the service
disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the
service panel.
WARNING: When service or replacement of a component in the fan requires the removal or disconnection
of a safety device, the safety device must be reinstalled or remounted as previously installed.
Please take a few moments each year to perform the following preventive maintenance inspection on your fan
to ensure its safe and efficient operation. Before contacting Customer Service, try resolving the issue using the
procedures in the Troubleshooting section. If you have any questions, contact Customer Service.
Annual preventive maintenance
Perform the following maintenance procedures each year using the Annual Maintenance Checklist.
1. Ensure all
upper
mounting bolts are present and torqued to 25 ft·lb (33.9 N·m).
2. Ensure airfoils are secured to one another by airfoil retainers.
3. Ensure all 12 bolts securing the airfoils to the fan are present and torqued to 29 ft·lb (39.3 N·m).
4. Ensure the two bolts securing the extension tube to the main fan unit are present and torqued to 25 ft·lb
(33.9 N·m).
5. Ensure all airfoil tip hardware is secure.
General preventive maintenance
• Verify proper fan rotation. To be effective, the fan must be turning counterclockwise when viewed from the floor.
• Dust airfoils and motor. If desired, use a gentle cleaner or degreasing agent to polish the airfoils. Do not use
Clorox
or other chlorine based cleaners! This could result in
®
the release of toxic/fatal fumes. Do not use cleansers on the
electronics enclosure.
• Check that the safety cable and upper mounting system are
secure.
• Observe the motion of the fan during operation. The fan should
not wobble or precess. If any wobble is noticed, ensure the
mounting structure is rigid enough to support the fan.
WARNING: Do not operate a fan with missing or damaged
components. Please contact Customer Service.
View from Below
26
PREVENTIVE MAINTENANCE
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