Bryant 581J series Installation Instructions Manual Download Page 9

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products could enter the building, and at least 4 ft (1.2 m)
from any adjacent building (or per local code). Locate the
flue assembly at least 10 ft (3.05 m) from an adjacent
unit’s fresh air intake hood if within 3 ft (0.91 m) of same
elevation (or per local code). When unit is located
adjacent to public walkways, flue assembly must be at
least 7 ft (2.1 m) above grade.

Select a unit mounting system that provides adequate
height to allow installation of condensate trap per
requirements. Refer to Step 11 — Install External
Condensate Trap and Line – for required trap dimensions.

Roof Mount —

Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.

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 accessory thru−base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)

Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 11 for
details)

Rig and place unit

Install outdoor air hood

Install flue hood

Install gas piping

Install condensate line trap and piping

Make electrical connections

Install other accessories

Pad−Mounted Installation —

Prepare pad and unit supports

Check and tighten the bottom condensate 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 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.

On units with hinged panel option, check to be sure all
latches are snug and in closed position.

Locate the carton containing the outside air hood parts;
see Fig. 10. 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
Fig. 5. 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. 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.

Table 1 – Operating Weights

581J*

UNITS LB (KG)

11/12

Base Unit

765 (347)

925 (419.5)

1090 (495)

Economizer

Vertical

75 (34)

Horizontal