Model G3B Gas burner — Instruction manual
MNG3B Gas 041015
9
2. Install Gas Piping from Meter to Combination Gas Valve
Code compliance
The burner/appliance installation must comply with codes listed on page 2 and
any other locally applicable codes.
Piping from meter to burner
Connect from the gas supply to the burner combination gas valve
inlet using new, clean black iron pipe and malleable iron fittings only.
Do not use copper, brass, cast iron or galvanized pipe or fittings.
Provide support for gas piping. Do not rest weight of piping on burner
gas valve.
Apply pipe dope sparingly at all joints. Use only pipe dope listed for
use with propane gas. Do not use pipe sealing tape.
Do not hold gas valve with pipe wrench. Use crescent wrench or
other smooth-jawed device. Do not over-tighten.
Failure to comply with above could result in severe personal injury,
death or substantial property damage.
1. If possible, install a new gas line directly from the gas meter. If you are
using an existing gas line, verify it is clean and in good condition, and
verify it is large enough to handle the load of all connected appliances.
2. When branching from a common gas line, do not tap off from the bottom
of horizontal sections — only from the side or top.
3. Install a main manual shutoff valve, sediment trap and ground joint
union near the burner combination gas valve connection as shown in
Figure 5.
4. If the burner is installed inside the appliance jacket, install the main
manual gas valve and sediment trap external to the jacket.
5. Size piping (or verify size) using Table 2. You will find additional informa-
tion on gas line sizing in the National Fuel Gas Code, ANSI Z223.1.
Gas supply pressure —
natural or propane
• Maximum supply pressure: 14 inches w.c.
• Minimum supply pressure: 5 inches w.c.
Do not expose the combination gas valve to gas pressure in
excess of 14 inches water column. Higher pressure could
damage the valve seat, resulting in potentially hazardous
condition. When pressure testing piping at higher pressures,
disconnect burner from gas line before testing.
If the gas supply pressure can exceed 14 inches water
column at any time, you must install a lockup type gas
pressure regulator in the gas supply piping, ahead of the main
manual gas valve installed at the burner.
Test and purge gas line
Read WARNING above.
Pressure test and purge the line. Pressure testing should be done by the
gas supplier or utility, following all applicable codes.
Table 2
Capacities of black iron pipe, cubic feet gas/
hour
Figure 5
Connecting gas supply piping to burner
1 Pipe to meter or branch
2 Main manual gas shutoff valve (must
be ‘T’ handle in state of MA)
3 Use clean, burr-free black iron pipe
and malleable iron fittings
4 Ground joint union
5 Sediment leg
6 Burner combination gas valve
7 Upstream pressure tap, 1/8”
npt
8 Outlet pressure tap, 1/8”
npt
9 Gas pressure regulator access screw
10 Gas valve wire terminal strip