Step 4 - Provide Unit Support; Roof Curb Mount; Alternate Unit Support (In Lieu Of Curb Mount) - Bryant 580J Series Installation Instructions Manual

Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Figs. 8, 9 and 10. 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 Figs. 8, 9 and 10. 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.
A
B
Fig. 6 - - 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. Thru- - the- - base power connection must be
installed before the unit is set on the roof curb. If
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.25" (6) 0.5" (12) 0.5" (12)
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field- - installed thru- - the- - roof curb gas connections are
desired remove knockout in basepan located in the gas
section, see Fig. 7 for location. Gas connections and
power connections to the unit must be field installed after
the unit is installed 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. 2, 3 or 4 for basepan knockout
locations. Attach the service connections to the basepan.
Control Box
Access Panel
Filter and
Indoor Coil
Access Panel
Indoor Blower
Access Panel
Gas Heat
Access Panel
Fig. 7 - - Typical Access Panel and Compressor Locations
Alternate Unit Support (In Lieu of Curb 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.
12
Hood Carton Location
(rear access panel)
Compressor
(each side)
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