8
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 in-
sulated and covered with a vapor barrier.
The 50TJ units with electric heat require a 25 mm (1-in.)
clearance for the first 610 mm (24 in.) of ductwork.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90-degree elbow must be provided in the ductwork
to comply with UL (Underwriters’ Laboratories) codes
(U.S.A. Standards) for use with electric heat.
Step 4 — Make Unit Duct Connections —
Unit
is shipped for through-the-bottom duct connections. Ductwork
openings are shown in Fig. 6. Field-fabricated concentric duct-
work may be connected as shown in Fig. 7 and 8. See Fig. 2
for horizontal adapter supply/return connections. Attach all
ductwork to roof curb and roof curb basepans. Refer to installa-
tion instructions shipped with accessory roof curb for more
information.
Step 5 — Trap Condensate Drain —
See Fig. 4, 5,
and 9 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One
3
/
4
-in. FPT is
provided inside unit evaporator section for condensate drain
connection. A 216-mm x 19-mm (8
1
/
2
-in. x
3
/
4
-in.) diameter
nipple and a 51-mm x 19-mm (2-in. x
3
/
4
-in.) diameter pipe
nipple are coupled to a standard 19-mm (
3
/
4
-in.) diameter
elbow to provide a straight path down through holes in unit
base rails (see Fig. 10). A trap at least 100 mm (4 in.) deep
must be used. If only one drain connection is trapped, other
connection must be plugged.
For vertical supply and return units, tools or part could
drop into ductwork and cause an injury. Install a 90 degree
turn in the return ductwork between the unit and the condi-
tioned 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
(50TJ024,028 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
(50TJ024,028 Shown)
19 FPT DRAIN
CONNECTION
35 (1-3/8")
DRAIN HOLE
19 (3/4”) FPT DRAIN
CONNECTION
1890
(6’-2 3/8”) MAX.
132
(5 3/16”)
1757
(5’-9 3/16”) MAX.
576
(1’-10 11/16”) MAX.
310
(1’-0 3/16”)
1392
(4’-6 13/16”)
506
(1’-7 15/16”)
310
(1’-0 3/16”)
610
(24”) MIN.
A’
BAFFLE
B’
B
A
Shaded area indicates block-off panels.
NOTES:
1. Dimension A, A
′
and B, B
′
are obtained from field-supplied ceiling
diffuser.
2. Dimensions are in millimeters.
Fig. 8 — Concentric Duct Details
NOTE: Dimensions are in millimeters.
Fig. 9 — Condensate Drain Details
To Next Page
Loading...
Need help?
General
