Bryant 310JAV, 310AAV warranty Horizontal Installation, Filter Arrangement, Air Ducts

5⁄16″

5⁄16″

1 3⁄4″

1 3⁄4″

5⁄16″

5⁄16″

13⁄4″

13⁄4″

A02071

Fig. 10—Leveling Legs

NOTE: It is recommended that the perforated supply-air duct flanges be completely folded over or removed from furnace when installing the furnace on a factory-supplied cased coil or coil box. To remove the supply-air duct flange, use wide duct pliers or hand seamers to bend flange back and forth until it breaks off. Be careful of sharp edges. (See Fig. 14.)

→BOTTOM RETURN AIR INLET

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following:

1.Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Fig. 9.)

2.Rotate bottom filler panel downward to release holding tabs.

3.Remove bottom closure panel.

4.Reinstall bottom filler panel and screws.

Step 3—Horizontal Installation

Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control opera- tion will be adversely affected. Never connect return-air ducts to the back of the furnace. Failure to follow this warning could result in fire, personal injury, or death.

The furnace can be installed horizontally in an attic or crawl space on either the left-hand (LH) or right-hand (RH) side. The furnace can be hung from floor joists, rafters or trusses or installed on a platform, non-combustible blocks, bricks or pad.

SUSPENDED UNIT SUPPORT

The furnace may be supported under each end with threaded rod, angle iron or metal plumber’s strap as shown. (See Fig. 15 and 16.) Secure angle iron to bottom of furnace as shown. Heavy-gauge sheet metal straps (plumber’s straps) may be used to suspend the unit from each bottom corner. To prevent screws from pulling out, use 2 # 8 x ¾ -in. screw into the side and 2 # 8 x ¾ -in. screw in the bottom of the furnace casing for each strap. (See Fig. 15 and 16.)

PLATFORM UNIT SUPPORT

Construct working platform at location where all required furnace clearances are met. (See Fig. 2 and 17.) For furnaces with 1-in. clearance requirement on side, set unit on non-combustible blocks, bricks or angle iron. For crawlspace installations, if the unit is not suspended from the floor joists, the ground underneath unit must be level and the unit set on blocks or bricks.

ROLL-OUT PROTECTION

Provide a minimum 17 3/4″ X 22″ piece of sheet metal for roll-out protection in front of burner area for units closer than 12 inches above the combustible deck or suspended units closer than 12-in. to joists. The sheet metal MUST extend underneath the furnace casing by 1 in. with the door removed.

The bottom closure pan on furnaces of widths 17 1/2 in. and larger may be used for roll-out protection when bottom of furnace is used for return air connection. See Fig. 17 for proper orientation of roll-out shield.

→BOTTOM RETURN AIR INLET

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following:

1.Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Fig. 9.)

2.Rotate bottom filler panel downward to release holding tabs.

3.Remove bottom closure panel.

4.Reinstall bottom filler panel and screws.

→SIDE RETURN AIR INLET

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. This panel MUST be in place when only one side return air is used.

→Not all horizontal furnaces are approved for side return air connections (See Fig. 20.)

Step 4—Filter Arrangement

Never operate a furnace without a filter or with filter access door removed. Failure to follow this warning could result in fire, personal injury, or death.

There are no provisions for an internal filter rack in these furnaces. A field-supplied accessory external filter rack is required.

This furnace requires KGAFR0301ALL 1″ external filter rack or a suitable field-supplied substitute, such as the Media Cabinet.

Refer to the instructions supplied with external filter rack for assembly and installation options.

Step 5—Air Ducts

GENERAL REQUIREMENTS

The duct system should be designed and sized according to accepted national standards such as those published by: Air Conditioning Contractors Association (ACCA), Sheet Metal and Air Conditioning Contractors National Association (SMACNA) or American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) or consult The Air Systems Design Guide- lines reference tables available from your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure.

9