Bryant 310JAV, 310AAV warranty → -Maximum Capacity of Pipe, → a-Right Side Gas Entry Example

→Table 4—Maximum Capacity of Pipe*

NOMINAL			LENGTH OF PIPE (FT)
IRON	INTERNAL
PIPE	DIAMETER
SIZE	(IN.)	10		20	30	40	50
(IN.)
1/2	0.622	175		120	97	82	73
3/4	0.824	360		250	200	170	151
1	1.049	680		465	375	320	285
1-1/4	1.380	1400		950	770	660	580
1-1/2	1.610	2100		1460	1180	990	900

*Cubic ft of gas per hr for gas pressures of 0.5 psig (14–in. wc) or less and a pressure drop of 0.5–in wc (based on a 0.60 specific gravity gas).

Ref: Table 12.2 NFPA 54-2002.

Connect gas pipe to gas valve using a backup wrench to avoid damaging gas controls.

Use proper length of pipe to avoid stress on gas control manifold. Failure to follow this warning could result in a gas leak resulting in fire, explosion, personal injury, or death.

→An accessible manual shutoff valve MUST be installed external to furnace casing and within 6 ft of furnace. A 1/8-in. NPT plugged tapping, accessible for test gage connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual shutoff valve.

→NOTE: The gas valve inlet pressure tap connection is suitable to use as test gage connection providing test pressure DOES NOT exceed maximum 0.5 psig (14-in. wc) stated on gas control valve. (See Fig. 50.)

→Some installations require gas entry on right side of furnace (as viewed in upflow). (See Fig. 21a.)

Install a sediment trap in riser leading to furnace as shown in Fig 21b. Connect a capped nipple into lower end of tee. Capped nipple should extend below level of gas controls. Place a ground joint union between gas control manifold and exterior manual equip- ment gas shutoff valve. A 1/8-in. NPT plugged tapping, accessible for test gage connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual shutoff valve.

→Piping should be pressure and leak tested in accordance with NFGC in the United States or NSCNGPIC in Canada, local, and national plumbing and gas codes before the furnace has been connected. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.

90° Elbow

2" Nipple

Street Elbow

Gas Valve

A02327

→Fig. 21a—Right Side Gas Entry Example

GAS

SUPPLY

MANUAL

SHUTOFF

VALVE (REQUIRED

SEDIMENT TRAP

UNION

A02035

Fig. 21b—Typical Gas Pipe Arrangement

→If pressure exceeds 0.5 psig (14-in. wc), gas supply pipe must be disconnected from furnace and capped before pressure test. If test pressure is equal to or less than 0.5 psig (14-in. wc), turn off electric shutoff switch located on furnace gas control valve and accessible manual shutoff valve before test. After all connections have been made, purge lines and check for leakage.

→The gas supply pressure shall be within the maximum and minimum inlet supply pressures marked on the rating plate with the furnace burners ON and OFF.

Step 7—Electrical Connections

Blower access panel door switch opens 115-v power to control center. No component operation can occur. Do not bypass or close switch with panel removed. Failure to follow this warning could result in personal injury or death.

See Fig. 24 for field wiring diagram showing typical field 115-v wiring. Check all factory and field electrical connections for tightness.

→Field-supplied wiring shall conform with the limitations of 63°F (33°C) rise.

The cabinet MUST have an uninterrupted or unbroken ground according to NEC ANSI/NFPA 70-2002 and Canadian Elec- trical Code CSA C22.1 or local codes to minimize personal injury if an electrical fault should occur. This may consist of electrical wire, conduit approved for electrical ground or a listed, grounded power cord (where permitted by local code) when installed in accordance with existing electrical codes. Refer to the power cord manufacturer’s ratings for proper wire gage. Do not use gas piping as an electrical ground. Failure to follow this warning could result in electrical shock, fire, or death.

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