Step 1 - Plan For Unit Location; Roof Mount; Step 2 - Plan For Sequence Of Unit Installation; Curb-Mounted Installation - Carrier 50HCQA07 Installation Instructions Manual

ROOF MOUNT

Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 2.
Table 2 — Operating Weights
50HCQ
Base Unit
Economizer
Vertical
Horizontal
Powered Outlet
Curb
14 in. (356 mm)
24 in. (610 mm)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se-
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit
before the unit is placed on the curb. Review the following for
recommended sequences for installation steps:

CURB-MOUNTED INSTALLATION

1. Install curb.
2. Install field-fabricated ductwork inside curb.
3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details).
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 10 — Install
External Condensate Trap and Line on page 14 for
details).
5. Rig and place unit.
6. Install outdoor air hood.
7. Install condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.

PAD-MOUNTED INSTALLATION

1. Prepare pad and unit supports.
2. Check and tighten the bottom condensate drain connection
plug.
3. Rig and place unit.
4. Convert unit to side duct connection arrangement.
5. Install field-fabricated ductwork at unit duct openings.
6. Install outdoor air hood.
7. Install condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.

FRAME-MOUNTED INSTALLATION

Frame-mounted applications generally follow the sequence for
a curb installation. Adapt the sequence as required to suit spe-
cific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with
transportation agency.
Confirm before installation of unit that voltage, amperage and
circuit protection requirements listed on unit data plate agree
with power supply provided.
On units with hinged panel option, check to be sure all latches
are snug and in closed position.
UNIT LB (KG)
A,D07 D08
710 (322) 875 (397) 1020 (463)
80 (36) 80 (36) 80 (36)
105 (48) 105 (48) 105 (48)
32 (15) 32 (15) 32 (15)
110 (50) 110 (50) 110 (50)
145 (66) 145 (66) 145 (66)
Locate the carton containing the outside air hood parts. Do not
remove carton until unit has been rigged and located in final
position.
Step 4 — Provide Unit Support

ROOF CURB MOUNT

Accessory roof curb details and dimensions are shown in
D09
Fig. 5. Assemble and install accessory roof curb in accordance
with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 6. Re-
fer to Accessory Roof Curb Installation Instructions for addi-
tional information as required.
Install insulation, cant strips, roofing felt, and counter flashing
as shown. Ductwork must be attached to curb and not to the
unit. The accessory thru-the-base power connection package
must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the base-
pan, attach the accessory thru-the-base service connections to
the basepan in accordance with the accessory installation in-
structions.
NOTE: The gasketing of the unit to the roof curb is critical for a
watertight seal. Install gasket supplied with the roof curb as shown
in Fig. 5. Improperly applied gasket can also result in air leaks and
poor unit performance.

SLAB MOUNT (HORIZONTAL UNITS ONLY)

Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from ob-
structing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit with a minimum of 3 equally spaced 4-in. x
4-in. (102 mm x 102 mm) pads on each side.
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