GAS ROUGH-IN
Check local codes for requirements as to the size and type of gas line required. See Figure 5 for location of gas inlet holes in furnace cabinet.
Compounds used on threaded joints of gas pipe should be resistant to the action of liquefied petroleum gases. The gas line joints must be checked for leaks. This should be done with a soap solution – watching for bubbles on all connections. NEVER USE AN EXPOSED FLAME TO CHECK FOR LEAKS.
A manual valve equipped with a 1/8” NPT plugged tapping accessible for test gauge connection should be installed immediately upstream of the gas supply connection to the appliance. Some codes and ordinances require that the manual valve be located outside the appliance. See Figure 4.
The appliance and its individual shut off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ psig.
The appliance must be isolated from the gas supply piping system by closing its individual manual shut off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ pig.
It is required by the National Fuel Gas Code that a drip line be installed near the gas inlet. This should consist of a vertical length of pipe tee connected into the gas line that is capped on the bottom in which condensation and foreign particles may collect.
To heater gas control valve
Manual cut off valve
1/8 N.P.T. | Gas | |
Supply | ||
Pressure Tap | ||
Line | ||
|
Drip
Leg
FIGURE 4
5” Knockout
4”
Gas Inlet
8” Hole
2”
FIGURE 5
Page 7
