Model 301GAS burner — Instruction manual
Carlin part number MN301GAS Rev. 11/24/14
– 10 –
Where appliance instructions differ from this manual, follow the appliance instructions.
2. Install gas piping from meter to combination gas train
Code compliance
The burner/appliance installation must comply with codes listed on page 2
and any other locally applicable codes.
Piping from gas meter to burner
Connect from the gas supply to the burner gas train 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 the weight of the
gas piping on burner gas train.
Provide a support for the burner gas train.
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 the gas valve with pipe wrench. Use crescent
wrench or other smooth-jawed device. Do not overtighten.
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 10.
4. If the burner is installed inside an 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 information
on gas line sizing in the National Fuel Gas Code, NFPA 54/ANSI Z223.1,
or B149.1/B149.2 Installation Code for Canadian Installations.
Gas supply pressure —
natural or propane
• Maximum supply pressure: 14 inches w.c.
• Minimum supply pressure: 5 inches w.c.
Do not expose the gas train to gas pressure in excess of 14
inches water column. Higher pressure could damage the valve
seat, resulting in potentially hazardous condition. When pres-
sure testing piping at higher pressures, disconnect burner from
gas line before testing.
If the gas supply pressure can exceed 14 inches water col-
umn 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.
1 Pipe to meter or branch
2 T-handle main manual gas valve
3 Use clean, burr-free black iron pipe
and malleable iron fittings
4 Ground joint union
Figure 10
Connecting gas supply piping to burner
Table 2
Capacities of black iron pipe, cubic feet gas/
hour
5 Sediment leg
6 Upstream pressure tap, 1/4”
7 Outlet pressure tap, 1/4”
8 Gas regulator access screw
9 Gas valve wire junction box
NATURAL GAS
Capacities in
Cubic feet per hour
for Schedule 40 metal pipe
Pipe size
(inches)
Total length of gas piping,
from meter to burner connection (feet)
20
40
60
80
100
Natural gas @ .60 specific gravity, pressure drop 0.3 in. w.c.
(note 1)
1¼
730
500
400
350
305
1½
1,100
760
610
530
460
2
2,100
1,450
1,150
990
870
2½
3,300
2,300
1,850
1,600
1,400
Natural gas @ .60 specific gravity, pressure drop 0.5 in. w.c.
(note 1)
1
465
320
260
220
195
1¼
950
660
530
460
400
1½
1,460
990
810
690
620
2
2,750
1,900
1,520
1,300
1,150
2½
4,350
3,000
2,400
2,050
1,850
Note 1
For natural gas with specific gravity other than 0.60, consult
National Fuel Gas Code, NFPA 54/ANSI Z223.1, or Canadian
B149.1/B149.2 for correction factor.
PROPANE GAS
Capacities in
Btuh
for
Schedule 40 metal pipe
Propane gas @ 1.5 specific gravity, pressure drop 1 psi
½
1,684
1,157
929
795
705
¾
3,521
2,420
1,943
1,663
1,474
1
6,632
4.558
3,660
3,133
2,776
Propane gas @ 1.5 specific gravity, pressure drop 0.5 in. w.c.
1
735
506
411
348
308
1¼
1502
1043
838
727
632
1½
2308
1565
1281
1091
980
