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Maintenance - continued
Removal of dust, dirt and debris - Dirt clogs cooling openings on the motor housing, contaminates bearing
lubricant, and collects on the propeller causing severe imbalance if left unchecked.
Periodically, thoroughly clean the exterior surface only of the motor. If optional motor cover is installed, remove it and
clean the motor of dust, dirt and debris to aid in motor cooling. Use caution and do not allow water or solvents to
enter the motor or bearings. Under no circumstances should motors or bearings be sprayed with steam or water.
Accumulations of dirt and debris on the propeller blades may cause an unbalanced condition resulting in excessive
vibration and premature failure of the propeller and bearings.
Dampers for Roof Upblast Configuration - If exhausting dirty or contaminated air, the propeller and butterfly
damper assembly should be cleaned periodically. Excessive buildup of dirt on the damper blades may cause binding
and sticking blade hinges resulting in loss of fan performance. Clean as needed.
These fans have heavy-duty fusible link damper lifters under very high spring tension that must be pinned so they
cannot be accidentally tripped when servicing the fan. The fusible link damper lifters are located under the butterfly
damper blades. Point "A" shows where the safety pin MUST be placed when the fan is being serviced. Point "B"
shows where the safety pin is placed for storage when the fan is in service.
Fan sizes 24, 30 and 36 also have fusible link damper lifters, but they do not have the ability to be pinned when
servicing due to differences in lifter designs.
In either case, extreme care must be taken when working around the damper lifter assemblies or serious bodily
injury or death may result.
Spring Lifter Tube
Point "B"
Pin Storage Location
Spring
Lock Plate
Fusible Link Assembly
10
Tubular Inline Fans
Point "A"
Lifter Arm
Install pin here to
lockout damper fifters
Spring Bracket
®
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