581J
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: 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. For liquified petroleum 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.
X
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
GAS
REGULATOR*
MANUAL GAS
SHUTOFF VALVE*
BASE UNIT
| 48” MINIMUM |
|
| DRIP LEG |
|
BASE RAIL | PER NFGC* | |
| ROOF | |
| SUPPORT* | |
FROM | CURB | |
LEGEND |
| |
GAS |
| |
METER | NFGC – National Fuel Gas Code |
|
*Field supplied.
NOTE: Follow all local codes.
STEEL PIPE | SPACING OF SUPPORTS |
NOMINAL DIAMETER | X DIMENSION |
(in.) | (ft) |
1/2 | 6 |
3/4 or 1 | 8 |
11/4 or larger | 10 |
The gas supply pipe enters the unit at the burner access panel on the front side of the unit, through the long slot at
Fig. 15 - Gas Piping Guide
C11091
the bottom of the access panel. The gas connection to the unit is made to the
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL | UNIT SIZE | MIN | MAX |
|
|
|
|
|
|
581J | 07, 08, 09, 12 | 4.0 in. wg | 13.0 in. wg |
|
(996 Pa) | (3240 Pa) |
| ||
|
|
| ||
|
|
|
|
|
|
|
|
| |
! | CAUTION |
|
| |
|
|
|
|
|
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.
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 smaller than the size specified. Size the gas supply line to allow for a maximum pressure drop of
The gas supply line can approach the unit in three ways: horizontally from outside the unit (across the roof),
(with Accessory Thru-the-Curb Service Connections)
This service connection kit consists of a NPT gas adapter fitting, an electrical bulkhead connector and a
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
STAINLESS STEEL FITTING
C008621
Fig. 16 - Thru-Base Connection Fittings
The
Check tightness of connector lock nuts before connecting gas piping.
Gas Line: Install a
14