6.2 Upflow-unit Plenums with EC Fans
EC fans onupflow units are mounted external to the unit ina factory-provided plenum. The plenum distributes air to the
conditioned space throughadjustable, double-deflectiongrilles, or connects with field-supplied duct work.
Read all instructions before installing plenums and EC fans.
WARNING! Risk of electric shock and contact with high-speed moving parts. Open all local and
remote electric power-supply disconnect switches, verify with a voltmeter that power is off, and
visually verify that all fans have stopped rotating before opening doors, removing panels, and
working within the unit cabinet. This unit may start and stop operating automatically. Do not
assume that electric power is off when the unit is not operating.
WARNING! Risk of contact with sharp edges, exposed fasteners, and improper handling of very
heavy parts. Can cause equipment damage, injury or death. Use extreme caution, wear
appropriate, OSHA-approved PPE, and install the EC fan(s) and plenum to the unit only as
described in these instructions.
More than one person may be required to complete the assembly and installation. Installer(s)
must be properly trained and qualified to lift, move and manipulate very heavy equipment from
floor level to the top of the unit.
Wear appropriate, OSHA-approved PPE when moving, lifting and installing the fan(s) and
plenum.
Equipment used in moving, lifting and installing the fan(s) and plenum must meet OSHA
requirements and be rated for the weight of the fan(s) and plenum. If ladders are used, verify
that they are rated for the combined weight of the fan(s), plenum and installer(s) as loaded. EC
Fan and plenum weights are specified in Table 7.1 on the next page and Table 7.2 on page47.
Read and follow the lifting equipment and/or ladder manufacturer's operating instructions and
safety requirements.
NOTE: Grilled plenums are intended for use in upflow configurations only. Non-grilled plenums provide
service access on upflow units with duct work.
NOTE: We recommend using a duct lift or scissors lift when installing the EC-fan assemblies on top of
the unit.
6 ECFans and Plenums
45
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