Electrical Connections - Bryant 820SB Installation, Operating, & Maintenance Instructions

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820SB/821SB: Installation, Start–Up, Operating and Service and Maintenance Instructions

Refer to

Table 5

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.

(1.8 M). 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.

Table 5 – Maximum Capacity of Pipe

Nominal:

1/2 (12.7) 3/4 (19.0)

Actual ID:

0.622

0.824

Length (ft)

Capacity in Cubic Feet of Gravity

172

360

10 (3.0)

118

247

20 (6.0)

199

30 (9.1)

170

40 (12.1)

151

50 (15.2)

NOTE: Cubic ft. of natural gas per hr for gas pressures of 0.5 psig

(14-in. w.c.) or less and a pressure drop of 0.5-in. w.c. (based on a 0.60

specific gravity gas). Ref: Chapter 6 current edition of NFPA 54/ANSI

Z223.1.

WARNING

FIRE OR EXPLOSION HAZARD

A failure to follow this warning could result in personal injury, death,

and/or property damage.

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 served another gas appliance. Black iron pipe shall be

installed at the furnace gas control valve and extend a minimum of 2-in.

(51 mm) outside the furnace.

CAUTION

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in furnace damage.

Connect gas pipe to furnace using a backup wrench to avoid damaging

gas controls and burner misalignment.

An accessible manual equipment shutoff valve MUST be installed

external to furnace casing and within 6 ft. (1.8 M) of furnace. A 1/8-in.

(3 mm) NPT plugged tapping, accessible for test gauge connection,

MUST be installed immediately upstream of gas supply connection to

furnace and downstream of manual equipment shutoff valve.

NOTE: The furnace gas control valve inlet pressure tap connection is

suitable to use as test gauge connection providing test pressure DOES

NOT exceed maximum 0.5 psig (14-in. w.c.) stated on gas control valve,

see

Fig.

21.

Fig. 21 – Redundant Automatic Gas Control Valve

Some installations require gas entry on right side of furnace (as viewed

in upflow), see

Fig.

22.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

1 (25.4)

1-1/4 (31.8) 1-1/2 (38.1)

1.049

1.380

1.610

678

1390

2090

466

957

1430

374

768

1150

320

657

985

284

583

873

A06666

Fig. 22 – Burner and Manifold

Install a sediment trap in riser leading to furnace, see

capped nipple into lower end of tee. Capped nipple should extend below

level of furnace gas controls. Place a ground joint union between furnace

gas control valve and exterior manual equipment gas shutoff valve.

A 1/8-in. (3 mm) NPT plugged tapping, accessible for test gauge

connection, MUST be installed immediately upstream of gas supply

connection to furnace and downstream of manual equipment shutoff

valve.

Fig. 23 – Typical Gas Pipe Arrangement

Piping should be pressure and leak tested in accordance with the current

addition of the NFPA 54/ANSI Z223 in the United States, 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.

If pressure exceeds 0.5 psig (14-in. w.c.), gas supply pipe must be

disconnected from furnace and capped before and during supply pipe

pressure test. If test pressure is equal to or less than 0.5 psig (14-in. w.c.),

turn off electric shutoff switch located on furnace gas control valve and

accessible manual equipment shutoff valve before and during supply

pipe pressure test. After all connections have been made, purge lines and

check for leakage at furnace prior to operating furnace.

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.