Step 7 - Convert To Horizontal And Connect Ductwork (When Required); Step 8 - Install Outside Air Hood; Economizer And Two-Position Damper Hood Package Removal And Setup; Economizer Hood And Two-Position Hood Assembly - Carrier WeatherMaster 48HC07 Series Installation Instructions Manual

Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit without
factory-installed economizer or return-air smoke detector op-
tion may be field-converted to horizontal ducted configuration.
To convert to horizontal configuration, remove screws from
side duct opening covers (see Fig. 9) and remove covers. Use
the screws to install the covers on vertical duct openings with
the insulation-side down. The panels must be inserted into the
notches on the basepan to properly seal. The notches are cov-
ered by the tape used to secure the insulation to the basepan
and are not easily seen. See Fig. 10 for position of the notches
in the basepan. Seals around duct openings must be tight. Se-
cure with screws as shown in Fig. 11. Cover seams with foil
duct tape.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. In-
sulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accor-
dance with applicable codes.
Do not cover or obscure visibility to the unit's informative data
plate when insulating horizontal ductwork.
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
Fig. 9 — Horizontal Conversion Panels
NOTCHES
BASEPAN
Fig. 10 — Location of Notches
Step 8 — Install Outside Air Hood
ECONOMIZER AND TWO-POSITION DAMPER HOOD
PACKAGE
OPTION
1. The hood is shipped in knock-down form and must be
field assembled. The indoor coil access panel is used as
the hood top while the hood sides, divider and filter are
packaged together, attached to a metal support tray using
plastic stretch wrap, and shipped in the return air compart-
ment behind the indoor coil access panel. The hood assem-
bly's metal tray is attached to the basepan and also
attached to the damper using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel.
(See Fig. 12.)
NOTCHES
3. Locate the (2) screws holding the metal tray to the basepan
and remove. Locate and cut the (2) plastic tie-wraps secur-
ing the assembly to the damper. (See Fig. 13.) Be careful
to not damage any wiring or cut tie-wraps securing any
wiring.
4. Carefully lift the hood assembly (with metal tray) through
the filter access opening and assemble per the steps out-
lined in Economizer Hood and Two-Position Hood, below.
ECONOMIZER HOOD AND TWO-POSITION HOOD
ASSEMBLY
NOTE: If the power exhaust accessory is to be installed on the
unit, the hood shipped with the unit will not be used and must be
discarded. Save the aluminum filter for use in the power exhaust
hood assembly.
1. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of
the indoor coil access panel. See Fig. 14.
2. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Use the screws provided
to attach the hood sides to the hood top. Use screws pro-
vided to attach the hood sides to the unit. See Fig. 15.
3. Remove the shipping tape holding the economizer baro-
metric relief damper in place (economizer only).
15
SCREWS
BASEPAN
Fig. 11 — Horizontal Duct Panels In Place
REMOVAL AND
DUCT COVERS
SHEET METAL
FACE UP
SETUP FACTORY
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