Bryant 312AAV/JAV Air Delivery CFM With Filter, Downflow Furnaces, Return Air Connections

Table 5 - Air Delivery - CFM (With Filter)* (Cont.)

FURNACE	RETURN---AIR	SPEED			EXTERNAL STATIC PRESSURE (IN. W.C.)
SIZE	INLET		0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
135--- 16/	Bottom	High	2090	2010	1930	1835	1710	1590	1470	1335	1025	835
		Med--- High	1790	1755	1705	1640	1550	1465	1360	1210	945	785
	or
048135		Med--- Low	1545	1525	1500	1450	1380	1315	1215	1005	855	670
	Side(s)
		Low	1325	1320	1295	1265	1210	1150	995	865	745	540
	Bottom	High	2485	2400	2310	2215	2110	2000	1880	1725	1535	1355
		Med--- High	2195	2150	2090	2000	1920	1825	1720	1565	1405	1255
	Only	Med--- Low	1880	1850	1820	1780	1715	1635	1540	1415	1290	1160
		Low	1640	1635	1615	1585	1530	1465	1370	1255	1150	1040
135--- 22/	Bottom Sides	High	--- ---	--- ---	2385	2305	2195	2085	1960	1825	1670	1465
		Med--- High	2180	2145	2060	2010	1945	1865	1765	1660	1515	1325
	or
066135		Med--- Low	1880	1850	1820	1780	1715	1635	1540	1415	1290	1160
	1 Side & Bottom
		Low	1640	1635	1615	1585	1530	1465	1370	1255	1150	1040
		High	2320	2250	2155	2055	1970	1855	1725	1600	1450	1280
	1 Side Only	Med--- High	2125	2065	1995	1910	1815	1710	1610	1490	1340	1175
		Med--- Low	1845	1825	1765	1710	1650	1570	1475	1370	1240	1100
		Low	1640	1620	1580	1540	1485	1410	1330	1220	1080	960
		High	2465	2430	2375	2305	2230	2110	2000	1865	1725	1545
	Bottom Only	Med--- High	2115	2105	2075	2030	1980	1910	1830	1725	1590	1425
		Med--- Low	1800	1790	1770	1735	1695	1640	1570	1465	1345	1225
155--- 20/		Low	1570	1565	1550	1525	1495	1445	1370	1270	1175	1070
060155	Both Sides Or 1	High	--- ---	--- ---	2375	2285	2200	2105	1995	1870	1730	1570
	Side & Bottom	Med--- High	2155	2135	2095	2040	1975	1895	1790	1685	1550	1400
	1 Side Only	High	--- ---	--- ---	2260	2180	2085	1975	1865	1740	1605	1455
		Med--- High	2140	2095	2040	1975	1890	1810	1705	1595	1480	1325
*A filter is required for each return ---air inlet. Airflow performance included 3/4---in. (19 mm) washable filter media such as contained in factory ---authorized ac-
cessory filter rack. To determine airflow performance without this filter, assume an additional 0.1 In. W.C. available external static pressure.
--- --- Indicates unstable operating conditions.

312AAV

Downflow Furnaces

Connect supply-air duct to supply-air outlet on furnace. Bend flange inward past 90_ with wide duct pliers. (See Fig. 14.) The supply-air duct must be connected to ONLY the furnace supplyoutlet or air conditioning coil casing (when used). When installed on combustible material, supply-air duct must be connected to ONLY the factory-approved accessory subbase, or a 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 to duct external to furnace casing.

Return Air Connections

GAS PIPING

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

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.

!WARNING

FIRE HAZARD

Failure to follow this warning could cause personal injury, death and/or property damage.

Never connect return-air ducts to the back of the furnace. Follow instructions below.

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. (See Fig. 19.)

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 into unused return air side of the furnace casing. (See Fig. 18 and 20.) Not all horizontal furnaces are approved for side return air connections. (See Fig. 20.)

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Use proper length of pipe to avoid stress on gas control manifold and a gas leak.

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to protect gas valve inlet from water and debris could result in death, personal injury and/or property damage.

Gas valve inlet and/or inlet pipe must remain capped until gas supply line is permanently installed to protect the valve from moisture and debris. Also, install a sediment trap in the gas supply piping at the inlet to the gas valve.

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