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12. Install the hood assembly onto the unit (see Fig. 9-11).
13. If barometric relief is required, remove the relief damper and
hinges from the (provided) bottom panel used on vertical
applications. Reinstall the hinges and damper on the side of
the field-supplied return duct. (See Fig. 12.)
NOTE: A relief hood for the horizontal application can be ordered
separately (part number CRBARHOD001A00) or can be field
supplied.
14. Install the hood screens and other approved EconoMi$er2
accessories.
Barometric Hood Assembly
The barometric hood can be assembled in vertical or horizontal
configuration. Figure 15 illustrates the barometric hood parts.
BAROMETRIC HOOD (VERTICAL CONFIGURATION)
1.
Remove the hood top panel from its shipping position on the
unit end. (See Fig. 16.)
2.
Remove the side panels located in the hood parts box (see
Fig. 17).
3.
Install parts as shown in the following exploded view (see
Fig. 18) using the seal strip and screws provided in the parts
box.
Fig. 15 — Barometric Hood Parts
Fig. 16 — Shipping Location, Vertical Units
Fig. 17 — Barometric Hood Box Parts Location
Fig. 18 — Barometric Hood Exploded View
Figure 19 illustrates the installed barometric hood parts.
Fig. 19 — Installed Barometric Hood Side View and
Isometric View
For horizontal return and field installed economizer, install the
economizer as follows:
1.
Install the field provided horizontal ductwork onto the unit.
Duct height must be at least 19-1/2 inches high, however the
duct can be no taller than the top of the relief opening in the
bottom panel, or airflow into the outside air hood will be
restricted. (See Fig. 20.)
2.
Cut a 16 in. x 36 in. opening in the return duct for the relief
damper (see Fig. 20).
3.
On the field installed economizer (CRECOMZR0**A00), a
birdscreen or hardware cloth is shipped attached to the bot-
tom panel used for vertical applications.
NOTE: This panel is not used for horizontal return applications.
Remove the screen from the provided panel and install it over the
relief opening cut in return duct.
4.
Using the blade brackets, install the relief damper onto the
side of the return duct (see Fig. 21). The two brackets and
relief damper are provided with the economizer.
5.
Using
the
provided
CRBARHOD001A00 hood sides and top together (see
Fig. 22).
Caulk the backside of the mating flanges to ensure a watertight
seal. Install the CRBARHOD001A00 over the relief damper and
screw to the return duct, as illustrated in Fig. 21.
8
hardware,
screw
the
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