Daikin Skyline OAH003GDAC Installation And Maintenance Manual page 29

• Control wiring—access to the VFD is through the fan
cabinet access door for single fans. Provide shielded
cable only as described in the VFD manual provided with
the unit. Route wire through panel so that it not interfere
with any other components or in the way of any access
doors. Do not drill through drip or drain pans. Refer to the
VFD installation manual provided with the unit for detailed
control wiring instructions.
• For multiple fans in parallel, the VFD(s) are mounted
inside of the electrical enclosure, which is mounted
on the exterior of the fan section. When multiple fan
sections are provided with multiple VFDs, they must be
set up so that the fans always start simultaneously and
are set to ramp up and down together. Do not attempt
to run fans in parallel at different speeds as this can
result in uneven airflow that can cause performance,
sound, and vibration problems that can lead to failure.
Provided that the fan is capable of running fast enough,
the motor is sized appropriately, and the VFD can be
sped up within its rated continuous output, VFDs may
be operated up to a maximum recommended frequency
of 90 Hertz for 1800 RPM and slower motors. Motors
that are 3600 RPM may be operated up to a maximum
speed of 4000 RPM or 66.7 Hertz provided the fan is
rated that high. Operation above 4000 RPM can damage
motor bearings and is not recommended.
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Wiring Penetrations
• Seal any panel penetrations for wiring or conduit per the
panel cutting procedure instructions within this document.
• Seal any other wiring or conduit penetrations in
accordance with NEC, relevant codes, and in order to
maintain the enclosure rating, only use fittings that are
approved to keep the particular rating of the individual
enclosure being penetrated per relevant code or standard
tables. Seal wireway openings tight enough to prevent air
movement between sections and control enclosures.
29 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
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