Daikin Maverick II MPS062E Installation And Maintenance Manual page 67

Bearings
Bearings are the most critical moving part of the fan; inspect
them at periodic intervals. Check locking collars, set screws,
and fasteners that attach bearings to the bearing plate for
tightness. In a clean environment and temperatures above
32°F/below 200°F, lubricate fan shaft bearings with grease
fittings semi-annually using a high quality lithium-based grease.
If unusual environmental conditions exist temperatures below
32°F/above 200°F, moisture or contaminants, more frequent
lubrication is required. With the unit running, add grease very
slowly with a manual grease gun until a slightbead of grease
forms at the seal. Be careful not to unseat the seal by over
lubricating or using excessive pressure. Bearings without
grease fittings are lubricated for life.
Fasteners and Setscrews
Any fan vibration has a tendency to loosen mechanical
fasteners. Periodic inspection should include checking all
fasteners and setscrews for tightness. Pay particular attention
to setscrews attaching the propeller to the shaft and the shaft
to the bearings. Loose bearing setscrews lead to premature
failure of the fan shaft.
Lubrication
Refer to "Bearings" for bearing lubrication. Many fractional
horsepower motors installed on the smaller fans are
lubricated for life and require no further attention. Oil motors
equipped with oil holes in accordance with the manufacturer's
instructions printed on the motor. Use a high grade SAE 20
machine oil and use caution not to over lubricate. Grease
motors supplied with grease fittings according to directions
printed on the motor.
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Removing Dust/Dirt
Thoroughly clean the exterior surface of the motor, fan panel,
and entire propeller periodically. Dirt can clog cooling openings
on motor housings, contaminate bearing lubricant, and
collect on propeller blades causing severe imbalance if left
unchecked. 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.
Exhaust Fan ON/OFF Control
The exhaust fans are turned ON and OFF based on building
static pressure, outdoor air damper position, and discharge
fan capacity. Exhaust fans do not have to always run while the
supply fan is ON, as does a return fan. They are turned ON
and OFF through output MCB-B02 on the Main Control Board.
For detailed information on Propeller Exhaust Fan Control, see
the operation manual supplied with the unit
Exhaust Fan Troubleshooting
Table 6 provides guidelines for troubleshooting problems with
the propeller exhaust fan options.
67
Unit Options
(OM 920).
IM 991-2 • MAVERICK II ROOFTOP