Bryant 580J***D series Installation Instructions Manual Download Page 7

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Although unit is weatherproof, avoid locations that permit

water from higher level runoff and overhangs to fall onto

the unit.

Locate mechanical draft system flue assembly at least 4 ft

(1.2 m) from any opening through which combustion

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 thru--base service connection fittings (affects

curb and unit)
Rig and place unit
Remove top skid
Install combustion 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
Rig and place unit
Remove duct covers and top skid
Install field--fabricated ductwork at unit duct openings
Install combustion 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.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown in

Fig. 5 (size 17 and 20 units) and Fig. 6 (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. 5 and Fig. 6. 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. 7. Refer to Accessory Roof Curb Installation

Instructions for additional information as required.

Table 1 – Operating Weights

580J***D

UNITS LB (KG)

Component

17D

20D

24D

28D