Carrier 50LJ - Manual (Page 13)

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IMPORTANT: If unit is to be equipped with
either barometric relief or power exhaust, the
barometric relief/power exhaust hood must be in­
stalled prior to the installation of the economizer
hoods. If installing barometric relief or power ex­
haust, proceed to the next section (Barometric
Relief/Power Exhaust Hood) and install before pro­
ceeding any further. Then return to this point.
5. Place the hoods on a flat surface.
6. Insert the top flange of the middle hood flush with the
bottom flange of the top hood AND the top flange of
the bottom hood flush with the bottom flange of the
middle hood. When properly laid out the side flanges
of the 3 hoods should form one continuous flange.
7. See Fig. 10 and insert the capscrew bolts through the
flange holes as shown, from the back side, threads
facing outward. Note that though there are 12 holes (4
per hood) per side, only the 3 shown per side are to be
used.
8. If unit is not to be equipped with barometric relief or
power exhaust, discard the channel clip. If unit is to be
equipped with barometric relief or power exhaust, dis­
card one of the channel panels.
9. Cut 2 pieces of seal strip 43 V 4 in. long for placement
on the channel panels (or one channel panel and one
channel clip if barometric relief or power exhaust is
used) on the flanges with the holes.
10. Begin one in. from the top of the flange and center the
seal strip on the flange, covering the holes.
NOTE: If seal strip is too high or too low, water leak­
age may occur. Maintain the one in. dimension for
placement.
11. Using a punch or other tool, make holes in the seal
strip for screws.
12. Place channel panels on the hood flanges, using the
middle 3 holes. If using barometric relief or power
exhaust, use the channel clip in place of the previously
discarded channel panel, attaching it to the left side of
the economizer hoods (left side when facing hoods).
13. Secure channel panels and/or channel clip to the hoods
using 6 of the nuts from the fastener package.
CROSS-SECTION
OF
CHANNEL PANEL/CHANNEL CLIP
14. See Fig. 11 and place economizer hood assembly over
outdoor-air opening.
A CAUTION
Economizer hood assembly is heavy. At least 2
men should handle it.
15.
16.
17.
18.
19.
20 .
21 .
Line up the holes in the right channel panel with the
holes in the flange of the comer post. On 48/50LJ units,
line up the holes on the left channel panel with the holes
on the flange of the panel next to the economizer sec­
tion. On 50LW units, line up the holes on the left
channel panel with the holes in the flange of the return
duct flange. On units with barometric relief or power
exhaust, line up the holes in the channel clip with the
holes in the fan deck. (It is necessary to remove the top
and bottom screws from the fan deck to install econo­
mizer hood assembly.)
Once economizer hood assembly is in place, secure it
using 10 of the screws from the fastener package (5 per
side).
Using 2 of the screws from the fastener package,
attach the top flange of the economizer hood assembly
to the unit top rail. The holes in the top rail are behind
the top rail gasket.
Using 4 screws from the fastener package, attach top
and bottom of the channel panels and/or clips to the
top rail and the base rail. Again, the holes in the top
rail and the base rail will be covered by gasketing.
Attach filter angle to base rail, using 2 screws from
fastener package. Since the holes are covered by the
base rail gasket, locate and punch them out before
attaching the filter angle.
Seal any small gaps between flanges and at the top with
RTV sealant to prevent water leakage.
Reinstall filters and filter retainers.
Fig. 10 — Economizer Hood Assembly Holes
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