Bryant 310JAV, 310AAV warranty Return AIR Connections, Gas Piping, 17 3/4″, 22″, 30-IN. MIN

LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY INTERSECTIONS OF THE TOP AND TWO SIDES OF THE FURNACE JACKET AND BUILDING JOISTS,

STUDS, OR FRAMING.

GAS

ENTRY

17 3/4″

SHEET

METAL

22″

MANUAL SHUTOFF

GAS VALVE

SEDIMENT

TRAP

			17 3/4″	OVER ALL
			4 3/4″	UNDER DOOR
			1″ UNDER FURNACE
	TYPE-B		EXTEND OUT 12″ OUT
	VENT
			FROM FACE OF DOOR
	″
6	MIN*	30-IN. MIN
				* WHEN USED WITH
		WORK AREA
				SINGLE WALL VENT
				CONNECTIONS

A02164

Fig. 17—Typical Attic Installation

Downflow Furnaces

Connect supply-air duct to supply-air opening on furnace. The supply-air duct attachment must ONLY be connected to furnace supply/outlet or air conditioning coil casing (when used). When installed on combustible material, supply-air duct attachment must ONLY be connected to the accessory subbase, KGASB0201ALL, or factory approved air conditioning coil casing. DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accessories MUST be connected external to furnace casing.

RETURN AIR CONNECTIONS

Never connect return-air ducts to the back of the furnace. A failure to follow this warning can cause a fire, personal injury, or death.

Downflow Furnaces

The return-air duct must be connected to return-air opening (bottom inlet) as shown in Fig. 1. DO NOT cut into casing sides (left or right). Side opening is permitted for only upflow and most horizontal furnaces. Bypass humidifier connections should be made at ductwork or coil casing sides exterior to furnace.

Upflow and Horizontal Furnaces

The return-air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing as shown in Fig. 1. Bypass humidifier may be attached to unused side return air portion of the furnace casing. (See Fig. 18, 19, and 20.)

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

Step 6—Gas Piping

→Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A failure to follow this warning could result in fire, explosion, personal injury, or death.

Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC in the U.S., the NSCNG- PIC in Canada.

Installations must be made in accordance with all authorities having jurisdiction. If possible, the gas supply line should be a separate line running directly from meter to furnace.

Refer to Table 4 for recommended gas pipe sizing. Risers must be used to connect to furnace and to meter. Support all gas piping with appropriate straps, hangers, etc. Use a minimum of 1 hanger every 6 ft. Joint compound (pipe dope) should be applied sparingly and only to male threads of joints. Pipe dope must be resistant to the action of propane gas.

→If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector which has previously serviced another gas appli- ance. Black iron pipe shall be installed at the gas valve and extend a minimum of 2-in. outside the furnace.

13