Step 11 - Install Gas Piping; Factory-Option Thru-Base Connections - Bryant Preferred Series Installation Instructions Manual

Step 11 — Install Gas Piping
Installation of the gas piping must be in accordance with local
building codes and with applicable national codes. In U.S.A., re-
fer 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 (NG) 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 (LP) 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. The input rating 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 connec-
tion must not be less than 4 in. wg (996 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating. On 581J 05-06
(high-heat) units, the gas pressure at unit gas connection must
not be less than 5 in. wg (1245 Pa) or greater than 13 in. wg
(3240 Pa) while the unit is operating. See Table 3. For liquefied
petroleum applications, the gas pressure must not be less than
11 in. wg (2740 Pa) or greater than 13.6 in. wg (3390 Pa) at the
unit connection.
The gas supply pipe enters the unit at the burner access panel
on the front side of the unit, through the long slot at the bottom
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.
2
Manifold pressure is factory-adjusted for natural gas fuel use. Ad-
just as required to obtain best flame characteristics. See Table 4.
Manifold pressure for LP fuel use must be adjusted to specified
range. Follow instructions in the accessory kit to make initial read-
justment, see Table 5.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL
581J*XX*065 to 115
581J*XX*130/150
Table 4 — Natural Gas Manifold Pressure Ranges
UNIT MODEL
581J*XX*065 to 115
581J*XX*130/150
Table 5 — Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE
Low and Medium Heat Units
581J*XX*065 to 115 04, 05, 06
High Heat Units
581J*XX*130/150 05, 06
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment damage.
When connecting the gas line to the unit gas valve, the in-
staller MUST use a backup wrench to prevent damage to
the valve.
UNIT SIZE MIN. MAX.
4.0 in. wg 13.0 in. wg
04, 05, 06
(996 Pa) (3240 Pa)
5.0 in. wg 13.0 in. wg
05, 06
(1245 Pa) (3240 Pa)
UNIT SIZE HIGH FIRE LOW FIRE
3.5 in. wg 1.7 in. wg
04, 05, 06
(872 Pa) (423 Pa)
3.5 in. wg 1.7 in. wg
05, 06
(872 Pa) (423 Pa)
HIGH FIRE LOW FIRE
10.0 in. wg 5.0 in. wg
(2490 Pa) (1245 Pa)
10.0 in. wg 5.0 in. wg
(2490 Pa) (1245 Pa)
Install a gas supply line that runs to the unit heating section.
Refer to the NFPA 54/NFGC or equivalent code for gas pipe
sizing data. Do not use a pipe size smaller than
gas supply line to allow for a maximum pressure drop of
0.5 in. wg (124 Pa) between gas regulator source and unit gas
valve connection 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
(factory option or accessory kit required). Consult accessory
kit installation instructions for details on these installation
methods. Observe clearance to gas line components per
Fig. 20.
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
BASE UNIT
BASE RAIL
ROOF
CURB
FROM
GAS
METER
LEGEND
NFGC — National Fuel Gas
Code
STEEL PIPE NOMINAL DIAMETERS
(IN.)
1 /
2
3 / or 1
4
1- 1 / or larger
4
Fig. 20 — Gas Piping Guide
(with Accessory Thru-the-Curb Service Connections)
FACTORY-OPTION THRU-BASE CONNECTIONS (GAS
CONNECTIONS)
This service connection kit consists of a
er fitting (brass), a / -in. electrical bulkhead connector and a
1
2
3 / -in. electrical bulkhead connector, all factory-installed in the
4
embossed (raised) section of the unit basepan in the condenser
section. See Fig. 21 and 22.
BRASS FITTING FOR 3 TO 6 TON UNITS.
Fig. 21 — Thru-Base Gas Connection Fittings (Units Built
On or Prior to 4/14/19)
16
/ -in. Size the
1
2
X
GAS
*
REGULATOR
MANUAL GAS
SHUTOFF VALVE *
48" MINIMUM
DRIP LEG
*
PER NFGC
FIELD-FABRICATED
SUPPORT *
*Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
X DIMENSION (FT.)
6
8
10
1 / -in. NPT gas adapt-
2
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR