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AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 5. Exhaust Plenum Installation
5.
Repeat steps 3 and 4 for the adjacent exhaust
plenum section on the adjoining section of
equipment
6.
Using the 3/8-16 x 1 inch carriage bolts, lock washers
and hex nuts provided, attach the upper two corners
of the middle flanges together and torque to 25-30
ft.-lbs. (Figure 5.6).
7.
Using the #12-24 x 7/8 inch self-thread forming
screws (Figure 5.8), complete attaching the two
middle flanges together. Torque the screws to 4-5
ft.-lbs. Optional flange clips may be used in lieu of
the #12-24 x 7/8 inch hardware.
CAUTION: If properly aligned, there should be no air
gap between the exhaust plenum and the plenum flange
on top of the switchgear. There should be no air gap
between the individual exhaust plenum sections.
NOTICE: As an option, a fire rated 440 butyl sealing
compound may be applied between exhaust plenum
flanges.
8.
Repeat steps 2 through 7 until all exhaust plenum
sections are installed above each section of the
switchgear lineup.
9.
After all exhaust plenum sections are installed above
each section of the switchgear. The left and right
side transition adapters can be installed at each end
of the plenum system. Using the 3/8-16 x 1 inch
carriage bolts, lock washers and hex nuts provided,
attach the upper two corners of the transition
adapters to the plenum flange and torque to 25-30
ft.-lbs. (Figure 5.6).
10. Using the #12-24 x 7/8 inch self-thread forming
screws (Figure 5.8), complete attaching the transition
adapter to the exhaust plenum flange. Torque the
screws to 4-5 ft.-lbs. Optional flange clips may be
used in lieu of the #12-24 x 7/8 inch hardware.
CAUTION: If properly aligned, there should be no air
gap between the transition adapter and the exhaust
plenum flange.
NOTICE: As an option, a fire rated 440 butyl sealing
compound may be applied between exhaust plenum
flanges.
11. Using the hardware and access cover retained from
step 2, re-install the access cover to each exhaust
plenum section. Be sure that the access cover is
located internally to the exhaust plenum (Figure 5.6)
and torque the hardware to 4-5 ft.-lbs.
39
Courtesy of NationalSwitchgear.com
CAUTION: Over-tightening of the access cover mounting
screws could damage the exhaust plenum itself. Care
should be taken while performing this task.
Figure 5.7 Plenum flange mounting hardware
Plenum Flange Mounting Hardware
(1)
Plenum Flange Opening
(2)
Figure 5.8 Attaching exhaust plenum flange (hardware)
©2016 General Electric. All rights reserved.
DEH-41473
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