3
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 50HJQ 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 elbow must be provided in the ductwork
to comply with UL (Underwriters’ Laboratories) codes 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. 7. Field-fabricated concentric duct-
work may be connected as shown in Fig. 8 and 9.
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. 5 or
6 and 10 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One
3
/
4
-in. half cou-
pling is provided inside unit indoor air section for condensate
drain connection. An 8
1
/
2
in. x
3
/
4
-in. diameter nipple 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. 11). A trap at least 4-in. deep
must be used.
For vertical supply and return units, tools or parts 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: For preassembled horizontal adapter (part no.
CRRFCURB013A00), the accessory kit includes a factory-assembled,
high-static, regain transition duct. For horizontal roof (part no.
CRRFCURB012A00), a field-supplied transition duct is required.
Fig. 2 — Horizontal Supply/Return Curb and
Horizontal Adapter Details
NOTE: Part no. CRRFCURB013A00 is a fully factory preassembled
horizontal adapter which includes an insulated high static regain
transition duct and substantially improves fan static performance.
Fig. 3 — Dimensional Drawing — Horizontal
Adapter Installation
DIMENSION A
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Table 1 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner
post from packaging to protect coil from damage. Use bumper
boards for spreader bars.
5. Weights do not include optional EconoMi$er. See Table 1 for
EconoMi$er weight.
6. Weights given are for aluminum indoor coil plate fins and cop-
per outdoor coil plate fins. Weights of other metal combinations
are listed in Table 1.
Fig. 4 — Rigging Details
UNIT 50HJQ
MAXIMUM
SHIPPING WEIGHT
Lb Kg
014
1895 860
016
2205 1000
UNIT 50HJQ Ft-in. mm
014
3-1 948
016
3-6 1059
All panels must be in place when rigging.
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