Step 3 - Field Fabricate Ductwork; Step 4 - Make Unit Duct Connections; Step 5 - Trap Condensate Drain - Carrier 50TJ016 Installation, Start-Up And Service Instructions Manual

Step 3 — Field Fabricate Ductwork —
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 50TJ units with electric heat require a 1-in. clearance
for the first 24 in. of ductwork.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90-degree elblow must be provided in the duct-
work to comply with UL (Underwriters' Laboratories) codes
for use with electric heat.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90 de-
gree turn in the return ductwork between the unit and
the conditioned space. If a 90 degree elbow cannot be
installed, then a grille of sufficient strength and density
should be installed to prevent objects from falling into
the conditioned space. Due to electric heater, supply duct
will require 90 degree elbow.
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 6 — Air Distribution — Through-the-Bottom
(50TJ020-028 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
(50TJ020-028 Shown)
Step 4 — Make Unit Duct Connections —
Secure all
is shipped for through-the-bottom duct connections. Duct-
work openings are shown in Fig. 6. Field-fabricated concen-
tric ductwork may be connected as shown in Fig. 7 and 8.
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 —
and 9 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One
coupling is provided inside unit evaporator section for con-
densate drain connection. An 8
and a 2-in. x
ard 3 ⁄ -in. diameter elbows to provide a straight path down
4
through holes in unit base rails (see Fig. 10). A trap at least
4-in. deep must be used.
NOTE: Dimension A, A and B, B are obtained from field-supplied
ceiling diffuser.
7
1 ⁄ in. x
2
3 ⁄ -in. diameter pipe nipple are coupled to stand-
4
Shaded area indicates block-off panels.
Fig. 8 — Concentric Duct Details
3/4" FPT DRAIN
CONNECTION
Fig. 9 — Condensate Drain Details
(50TJ016,020 Shown)
Unit
See Fig. 4, 5,
3 ⁄ -in. half-
4
3 ⁄ -in. diameter nipple
4
1-3/8"
DRAIN HOLES