Bryant LEGACY 580J*20M Series, Installation Instructions Manual

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18
Step 9 — Install Gas Piping —
Installation of the gas pip-
ing must be in accordance with local building codes and with ap-
plicable national codes. In U.S.A., refer to NFPA 54/ANSI
Z223.1 National Fuel Gas Code (NFGC). In Canada, installation
must be accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel at
elevations up to 2000 ft (610 m) above sea level. Unit may be
field converted for operation at elevations above 2000 ft (610 m)
and/or for use with liquefied petroleum fuel. See accessory kit
installation instructions regarding these accessories.
NOTE: Furnace gas input rate on rating plate is for installation
up to 2000 ft (610 m) above sea level. In U.S.A. the input rating
for altitudes above 2000 ft (610 m) must be derated by 4% for
each 1000 ft (305 m) above sea level. In Canada the input rating
must be derated by 10% for altitudes of 2000 ft (610 m) to
4500 ft (1372 m) above sea level.
For natural gas applications, gas pressure at unit gas con-
nection must not be less than 5 in. wg (1246 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating. For liquefied pe-
troleum applications, the gas pressure must not be less than
11 in. wg (2740 Pa) or greater than 13 in. wg (3240 Pa) at the
unit connection.
GAS SUPPLY LINE — The gas supply pipe enters the unit
adjacent to the burner access panel on the front side of the unit,
through the grommeted hole. The gas connection to the unit is
made to the 3 /
4
in. FPT gas inlet port on the unit gas valve.
For natural gas applications, gas pressure at unit gas connec-
tion must not be less than 5 in. wg (1246 Pa) or greater than 13
in. wg (3240 Pa) while the unit is operating, see Table 3.
Table 3 — Natural Gas Supply Line Pressure
Manifold pressure is factory-adjusted for NG fuel use. Adjust
as required to obtain best flame characteristics. See Table 4 for
ranges.
Table 4 — Natural Gas Manifold Pressure Ranges
Table 5 lists typical 3 /
4
in. NPT (National Pipe Thread) field
supplied pipe fittings required for Thru-Base gas supply, starting
from the unit gas valve (see Fig. 17).
Pipe gas supply into 90 degree elbow item 15 (see Table 5)
through the hole in the unit basepan.
For typical 3 /
4
in. NPT field supplied fittings required for
NON Thru-Base gas supply starting from the unit gas valve,
omit items 14 and 15 from Table 5 and pipe gas supply into Tee.
See Fig. 18.
Fig. 17 — Gas Supply Line Piping with Thru-Base
Fig. 18 — Gas Supply Line Piping
Table 5 — Typical 3/4 in. NPT Field Supplied Piping
Parts
UNIT MODEL UNIT SIZE MIN. MAX.
580J*
17, 20, 24,
28, 30
5.0 in.wg
(1246 Pa)
13.0 in.wg
(3240 Pa)
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
580J*
17, 20, 24,
28, 30
3.0 in.wg
(747 Pa)
2.0 in.wg
(498 Pa)
CAUTION
Failure to follow this caution may result in damage to
equipment.
When connecting the gas line to the unit gas valve, the
installer MUST use a backup wrench to prevent damage to
the valve.
ITEM QTY DESCRIPTION
1 1 90° Street Elbow
2 1 5 in. Long Nipple
3 1 Ground - Joint Union
4 1 3 in. Long Nipple
5 1 90° Elbow
6 1 12 in. Long Nipple
7 1 90° Elbow
8 1 3 in. Long Nipple
9 1 Tee
10 1 4 in. Long Nipple (Sediment Trap)
11 1 Cap
12 1 3
1
/
2
in. Long Nipple
13 1 NIBCO * Ball Valve (PN: GB30)
* NIBCO is a registered trademark of NIBCO Inc.
14 1 8 in. Long Nipple
15 1 90° Elbow
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
13
12
11
10
9
8
7
6
5
4
3
2
1