9
Pad--mounted Installation —
Prepare pad and unit supports
Check and tight en the bottom condensat e drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install flue hood
Install gas piping
Install condensate line trap and pipi ng
Make electrical connections
Install other accessories
Frame--mounted Installation —
Frame--mounte d applications gene rally follow the
sequence for a curb instal lation. 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.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb detail s and dimensions are shown in
Fig. 5. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasket ing 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 appli ed
gasket can also result in air le aks and poor unit
performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 4. Refer to Accessory Roof Curb Installation
Instructions for a dditiona l information as required.
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
C06110
Fig. 4 -- Unit Leveling Tolerances
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 and
gas connection package must be installed before the unit
is set on the roof curb. If field--instal led thru--the--roof
curb gas connections are desired, use factory--supplied
1
/
2
--in. pipe coupling and gas plate assembly to mount the
thru--the--roof curb connection to the roof curb. Gas
connec tions and power connections to the unit must be
field installed aft er the unit is installed on the roof curb.
If ele ctric and control wiring is to be routed through the
basepan, attach the accessory thru--the --base service
connections to the basepan in accordance with the
accessory installation instructions.
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
(InLieuofCurborSlabMount)—
A non--combustible sleeper rail can be used in the unit
curb support area. If sleeper rail s 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.
582J
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