Bryant 581J Convert to Horizontal and Connect, Ductwork when required, Install Outside Air Hood

	Positioning on Curb —
	Position unit on roof curb so that the following clearances
	are maintained: 1/4 in. (6.4 mm) clearance between the
	roof curb and the base rail inside the front and back, 0.0
	in. clearance between the roof curb and the base rail
	inside on the duct end of the unit. This will result in the
	distance between the roof curb and the base rail inside on
	the condenser end of the unit being approximately equal
	to Fig. 4 and Fig. 5, section C-C.
	Although unit is weatherproof, guard against water from
	higher level runoff and overhangs.
	Flue vent discharge must have a minimum horizontal
	clearance of 4 ft (1220 mm) from electric and gas meters,
	gas regulators, and gas relief equipment. Minimum
	distance between unit and other electrically live parts is
581J	48 inches (1220 mm).
	Flue gas can deteriorate building materials. Orient unit such
	that flue gas will not affect building materials. Locate
	mechanical draft system flue assembly at least 48 in. (1220
	mm) from an adjacent building or combustible material.
	NOTE: Installation of accessory flue discharge deflector
	kit will reduce the minimum clearance to combustible
	material to 18 in. (460 mm).
	After unit is in position, remove rigging skids and
	shipping materials.
	Step 7 — Convert to Horizontal and Connect
	Ductwork (when required)
	Unit is shipped in the vertical duct configuration. Unit
	without factory-installed economizer or return air smoke

Do not cover or obscure visibility to the unit’s informative data plate when insulating horizontal ductwork.

Step 8 — Install Outside Air Hood

Economizer and Two Position Damper Hood Package Removal and Setup - Factory Option

1.The hood is shipped in knock-down form and must be field assembled. The indoor coil access panel is used as the hood top while the hood sides, divider and filter are packaged together, attached to a metal support tray us- ing plastic stretch wrap, and shipped in the return air compartment behind the indoor coil access panel. The hood assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie- wraps.

2.To gain access to the hood, remove the filter access panel. (See Fig. 9.)

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

detector option may be field-converted to horizontal ducted

configuration. To convert to horizontal configuration,

Fig. 9 - Typical Access Panel Locations

C10146

remove screws from side duct opening covers and remove
covers. Using	the same screws, install covers on vertical
duct openings	with the insulation-side down. Seals around
duct openings must be tight. See Fig. 8.

3.Locate the (2) screws holding the metal tray to the basepan and remove. Locate and cut the (2) plastic tie-wraps securing the assembly to the damper. (See Fig. 10) Be careful to not damage any wiring or cut tie-wraps securing any wiring.

Hood Parts

Plastic Tie Wrap

Qty (2)

Screws for Metal Tray

Qty (2)

Fig. 8 - Horizontal Conversion Panels

C06108

C08639

Field-supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.

Fig. 10 - Economizer and Two-Position Damper

Hood Parts Location

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