Step 10 - Install Gas Piping - Bryant LEGACY 580J*16 Series Installation Instructions Manual

Step 10 — Install Gas Piping —
ing must be accordance with local building codes and with appli-
cable 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 regard-
ing 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 rat-
ing for altitudes above 2000 ft (610 m) must be derated by 4%
for each 1000 ft (305 m) above sea level.
For natural gas applications, gas pressure at unit gas connection
must not be less than 4 in. wg (996 Pa) or greater than 13 in. wg
(3240 Pa) while the unit is operating for size 08 to 14 and 5 in. wg
(996 Pa) or greater than 13 in. wg (3240 Pa) while the unit is oper-
ating for size 16 (see Table 3). For liquefied petroleum applica-
tions, the gas pressure must not be less than 11 in. wg (2740 Pa) or
greater than 13.0 in. wg (3240 Pa) at the unit connection, see
Table 4.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE
08, 09, 12, 14
580J
Table 4 — Liquid Propane Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE
08, 09, 12, 14,
580J
The gas supply pipe enters the unit at the burner access pan-
el on the front side of the unit, through the long slot at the bot-
tom of the access panel. The gas connection to the unit is made
to the 1 / -in. FPT gas inlet port on the unit gas valve for sizes
2
08-14 and 3 / -in. FPT gas inlet port on the unit gas valve for
4
size 16, see Table 5.
Manifold pressure is factory-adjusted for NG fuel use. Adjust
as required to obtain best flame characteristics.
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL UNIT SIZE
08, 09, 12, 14
580J
*LOW FIRE, 1.7 in. wg (423 Pa), applies to the following units only:
580J*08D/F and 580J*09D.
Manifold pressure for LP fuel use must be adjusted to specified
range, see Table 6. Follow instructions in the accessory kit to
make initial readjustment.
Table 6 — Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE
08, 09, 12, 14
580J
*LOW FIRE, 5.0 in. wg (1420 Pa), applies to the following units
only: 580J*08D/F and 580J*09D.
Installation of the gas pip-
MIN. MAX.
4.0 in. wg 13.0 in. wg
(996 Pa) (3240 Pa)
5.0 in. wg 13.0 in. wg
16
(1250 Pa) (3240 Pa)
MIN. MAX.
11.0 in. wg 13.0 in. wg
16 (2740 Pa) (3240 Pa)
HIGH FIRE LOW FIRE*
3.5 in. wg
(872 Pa)
2.0 in. wg
(498 Pa)
3.0 in. wg
16
(747 Pa)
HIGH FIRE LOW FIRE*
5.7 in. wg
(1420 Pa)
10.0 in. wg
(2490 Pa)
6.6 in. wg
16
(1644 Pa)
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.
Install a gas supply line that runs to the unit heating section.
Refer to the NFPA 54/NFGC or equivalent code for gas pipe siz-
ing data. Do not use a pipe size smaller than
supply line to allow for a maximum pressure drop of 0.5-in. wg
(124 Pa) between gas regulator source and unit gas valve connec-
tion when unit is operating at high-fire flow rate.
The gas supply line can approach the unit in three ways: hori-
zontally from outside the unit (across the roof), thru-curb/under
unit basepan (accessory kit required) or through unit basepan (fac-
tory-option or accessory kit required). Consult accessory kit instal-
lation instructions for details on these installation methods.
Observe clearance to gas line components per Fig. 25.
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
BASE UNIT
BASE RAIL
ROOF
CURB
FROM
GAS
METER
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
BASE UNIT
BASE RAIL
ROOF
CURB
* Field supplied.
STEEL PIPE NOMINAL
DIAMETER (in.)
1
/
2
3
/
or 1
4
1
/
1 or larger
4
Fig. 25 — Gas Piping Guide (with Accessory Thru-the-
Curb Service Connections)
21
CAUTION
/ -in. Size the gas
1
2
X
GAS
*
REGULATOR
MANUAL GAS
*
SHUTOFF VALVE
48" MINIMUM
DRIP LEG
*
PER NFGC
FIELD-FABRICATED
*
SUPPORT
SIZES 08-14
X
GAS
REGULATOR *
MANUAL GAS
*
SHUTOFF VALVE
48" MINIMUM
DRIP LEG
*
PER NFGC
FIELD-
FABRICATED
SUPPORT
SIZE 16
SPACING OF SUPPORTS X
DIMENSION (ft)
6
8
10
FROM
GAS
METER