Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 - Manual (Page 7)

Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors be-
tween unit and ducts as required. Insulate and weatherproof
all external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections. Duct-
work openings are shown in Fig. 1, 4, and 5. Duct connec-
tions are shown in Fig. 6. Field-fabricated concentric duct-
work may be connected as shown in Fig. 7 and 8. Attach all
ductwork to roof curb and roof curb basepans.
Step 5 — Install Flue Hood — Flue hood is shipped
secured to a baffle under main control box. To install, secure
flue hood to access panel. See Fig. 9.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 10.
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 6 — Air Distribution — Through-the-Bottom
(48HJ017 and 025 Shown)
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
(48HJ017 and 025 Shown)
NOTE: Dimensions A, A Ј , B, and B Ј are obtained from field-supplied
ceiling diffuser.
areas indicate block-off pans.
Fig. 8 — Concentric Duct Details
Fig. 9 — Flue Hood Location
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