Step 2 - Plan For Sequence Of Unit Installation; Step 3 - Inspect Unit; Step 4 - Provide Unit Support - Carrier 50TCQD Installation Instructions Manual

Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences 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 —
Install curb
Install field- - fabricated ductwork inside curb
Install thru- - base service connection fittings (affects
curb and unit)
Rig and place unit
Remove top skid
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad- - mounted installation —
Prepare pad and unit supports
Rig and place unit
Remove duct covers and top skid
Install field- - fabricated ductwork at unit duct openings
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame- - mounted installation —
Frame- - mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific 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.
Table 1 – Operating Weights
50TCQD UNITS LB (KG)
Component
Base Unit 2035 923)
Economizer
Powered Outlet
Curb
14--- in/356 mm
24--- in/610 mm
UNITS LB (KG)
17 24
2200 (998)
245 (111) 245 (111)
32 (15) 32 (15)
243 (111) 273 (124)
315 (143) 350 (159)
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 4 (size 17 and 20 units) and Fig. 5 (size 24 and 28
units). Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
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. 4 and Fig. 5. Improperly
applied gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 6. Refer to Accessory Roof Curb Installation
Instructions for additional 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. Thru- - the- - base power connection must be
installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the
basepan remove knockouts in basepan located in control
box area, see Fig. 7 for location. Attach the service
connections to the basepans.
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 obstructing 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 4 equally
spaced 4- - in. x 4- - in. (102 mm x 102 mm) pads on each
side. Locate pads so that they support the rails. Make sure
to avoid the fork openings.
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