Bryant 355CAV User Manual

Page 24

UNION

SEDIMENT

TRAP

MANUAL

SHUTOFF

VALVE

(REQUIRED)

GAS

SUPPLY

A93324

Fig. 27 -- Typical Gas Pipe Arrangement

COMBUSTION-AIR PIPE GROMMET

GAS LINE GROMMET

GAS LINE

COMBUSTION
-AIR PIPE

VENT PIPE

VENT PIPE GROMMET

UNUSED 1-3/4 -IN. (44 mm)
DIAMETER GAS
CONN. HOLE

GAS LINE ENTRY
HOLE FILLER PLUG

NOTE: PIPE GROMMETS AND ENTRY HOLE FILLER
PLUGS ARE INCLUDED IN FACTORY-SUPPLIED
LOOSE PARTS BAG

A05057

Fig. 28 -- Casing Pipe Grommets

Table 3 –

Maximum Capacity of Pipe*

NOMINAL

IRON

PIPE

SIZE

IN. (MM)

INTERNAL

DIA.

IN. (MM)

LENGTH OF PIPE --- FT (M)

(3.0)

(6.0)

(9.1)

(12.1)

(15.2)

1/2 (13)

0.622

(158)

175

120

3/4 (19)

0.824

(21)

360

250

200

170

151

1 (25)

1.049

(27)

680

465

375

320

285

1-1/4

(32)

1.380

(35)

1400

950

770

660

580

1-1/2

(38)

1.610

(41)

2100

1460

1180

990

900

* Cubic ft. of gas per hr for gas pressure 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 9--- 2 NFPA

54--- 2002.

NOTE: The gas 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. wc) stated on gas valve. (See
Fig. 60.)
Piping should be pressure and leak tested in accordance with

NFGC in the United States or CAN/CSA--B149.1--05 in Canada,

local, and national plumbing and gas codes before the furnace has
been connected. 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 gas valve before test. It is
recommended that ground joint union be loosened before pressure

testing. After all connections have been made, purge lines and
check for leakage at furnace prior to placing it into service.
The gas supply pressure shall be within the maximum (13.6--in.
wc) and minimum (4.5--in. wc) inlet supply pressures marked on

the rating plate with the furnace burners ON at HI--HEAT and OFF.

355C