Bryant PURON 581J - Manual (Page 11)

11
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:
Furance 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
connection 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 04--06 high--heat units (see Table 2),
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. For liquified 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 /
2
--in. FPT gas inlet port on the unit
gas valve
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
Low & Med Heat Units
581J* 04, 05, 06
4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
High Heat Units
58J*04*115 04
5.0 in. wg
(1245 Pa)
13.0 in. wg
(3240 Pa))
58J*05*150 05
58J*06*150 06
EQUIPMENT DAMAGE HAZARD
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.
CAUTION
!
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 1 /
2
--in. Size the 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:
horizontally 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. 13.
LEGEND
* Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACING OF SUPPORTS
X DIMENSION
(ft)
1 /
2
3 /
4
or 1
1 1 /
4
or larger
6
8
10
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-FABRICATED
SUPPORT
*
FROM
GAS
METER
C11091
Fig. 13 -- Gas Piping Guide
(with Accessory Thru--the--Curb Service Connections)
Factory--Option Thru--Base Connections
(Gas Connections) —
This service connection kit consists of a
1 /
2
--in NPT gas
adapter fitting (brass), a 1 /
2
--in electrical bulkhead
connector and a 3 /
4
--in electrical bulkhead connector, all
factory--installed in the embossed (raised) section of the
unit basepan in the condenser section.
LOW VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3 TO 6 TON UNITS.
STAINLESS STEEL FITTING FOR 7 1/2 TO 12 1/2 TON.
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08015
Fig. 14 -- Fittings
The thru--base gas connector has male and female threads.
The male threads protrude above the basepan of the unit;
the female threads protrude below the basepan.
Check tightness of connector lock nuts before connecting
gas piping.
Install a
1 /
2
--in NPT street elbow on the thru--base gas
fitting. Attach a 1 /
2
--in pipe nipple with minimum length
of 16--in (406 mm) (field--supplied) to the street elbow
and extend it through the access panel at the gas support
bracket. See Fig. 15.
581J