Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with local building codes and with applicable 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: 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.
|
|
|
| X |
|
|
|
|
|
|
|
|
|
|
| ||
| 9” MINIMUM CLEARANCE |
|
| |||||
| FOR PANEL REMOVAL |
|
| |||||
|
|
|
|
| GAS | FROM | ||
|
|
|
|
| REGULATOR* | GAS | ||
|
|
| MANUAL GAS | METER | ||||
|
|
| SHUTOFF VALVE* |
|
| |||
BASE UNIT |
|
| ||||||
|
|
|
|
|
|
|
|
|
48” MINIMUM
DRIP LEG
PER NFGC* BASE RAIL
ROOF |
|
| FIELD- | |
|
| FABRICATED | ||
CURB |
|
| ||
|
| SUPPORT* | ||
|
|
|
| |
|
| LEGEND |
| |
| 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 | ||
For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1250 Pa) or greater than 13 in. wg (3240 Pa) while the unit is operating. For liquified petroleum applications, the gas pressure must
Fig. 16 - Gas Piping Guide
C11121
48TC**16
not be less than 11 in. wg (2740 Pa) or greater than 13 in. wg (3240 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
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT | MIN | MAX |
|
|
|
|
|
48HC**14 | 5.0 in. wg (1250 Pa) | 13.0 in. wg (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. 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),
This service connection kit consists of a
1/2” ELECTRICAL BULKHEAD
11/2” ELECTRICAL CONNECTOR
BULKHEAD
CONNECTOR
3/4” NPT GAS ADAPTER FITTING
C10905
Fig. 17 - Thru-the-Base Option, Shipping Position
1.Remove the “L” bracket assembly from the unit (see Fig. 17).
2.Cut and discard the wire tie on the gas fitting. Hand tighten the fitting if it has loosened in transit.
3.Remove connector plate assembly from the “L” bracket and discard the “L” bracket, but retain the washer head screws and the gasket (located between the “L” bracket and the connector plate assembly
NOTE: Take care not to damage the gasket, as it is reused in the following step.
4.Place the gasket over the embossed area in the basepan, aligning the holes in the gasket to the holes in the basepan. See Fig. 18.
5.Install the connector plate assembly to the basepan using 8 of the washer head screws.
11
