Carrier 50HJ015 - Step 3 - Field Fabricate Ductwork; Step 4 - Make Unit Duct Connections; Step 5 - Trap Condensate Drain

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.
The 50HJ units with electric heat require a 1-in. clear¬
ance for the first 24 in. of ductwork.
Outlet grilles must not lie directly below unit discharge.
Step 4 — Make Unit Duct Connections - Unit
is shipped for through-the-bottom duct connections. Duct¬
work openings are shown in Fig. 5. Field-fabricated con¬
centric ductwork may be connected as shown in Fig. 6 and
7. Attach all ductwork to roof curb and roof curb basepans.
Refer to installation instructions shipped with accessory roof
curb for more information.
Step 5 — Trap Condensate Drain — See Fig. 4
and 8 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One 3 /4-in. half
NOTE. Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 5 — Air Distribution — Through-the-Bottom
(50HJ024 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 6 - Concentric Duct Air Distribution
(50HJ024 Shown)
coupling is provided inside unit evaporator section for con¬
densate drain connection. An 8Vi in x 3 A-in. diameter nip¬
ple and a 2-in. x 3 /4-in. diameter pipe nipple are coupled to
standard 3 /4-in. diameter elbows to provide a straight path
down through holes in unit base rails (see Fig. 9). A trap at
least 4-in. deep must be used.
Shaded area indicates block-off panels.
NOTE ^Dimensions A, A' and B, B' are obtained from field-supplied
ceiling diffuser
Fig. 7 - Concentric Duct Details
Fig. 9 — Condensate Drain Piping Details
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