Gas Piping - Sizing Gas Lines - Weil-McLain EcoTec 80 Manual

G -
®
ECO Tec
AS FIRED WATER BOILER
Gas piping — sizing gas lines
Boiler gas connection is ½" NPT. Size gas lines large
enough to provide gas to all connected appliances.
Natural Gas:
1. Size gas piping from meter outlet to entrance of boiler in
accordance with Figure 23 and Figure 24.
2. Use total input of all connected appliances. Divide total input
in Btuh by 1,000 to obtain cubic feet per hour of natural gas.
a. Pipe lengths in Figure 23 are equivalent length of straight
pipe. Convert pipe fittings to equivalent lengths using data
from Figure 24.
b. Figure 23 is only for natural gas with specific gravity 0.60,
with a pressure drop through the gas piping as listed in
the table.
c. For additional gas pipe sizing information, refer to ANSI
Z223.1 NFPA 54 – latest edition (or Natural Gas and
Propane Installation CAN/CSA B149.1 or B149.2 for
Canadian installations).
1. Pressure required at gas valve inlet pressure port, see
Figure 93, page 102:
a. Maximum: 14" (355 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
ECO Tec 80: 3½" (89 mm) w.c.
ECO Tec 110: 3½" (89 mm) w.c.
ECO Tec 150/199: 3½" (89 mm) w.c.
c. Nominal gas pressure: 7.0" (178 mm) w.c.
2. Install 100% lockup gas pressure regulator in supply line if
inlet pressure can exceed 14" w.c. at any time. Adjust lockup
regulator for 14" w.c. maximum.
Propane Gas:
You must follow the instructions, beginning on
page 14, to operate the boiler on propane. Failure to
comply could result in severe personal injury, death
or substantial property damage.
1. Contact gas supplier to size pipes, tanks and 100% lockup gas
pressure regulator.
Part number 550-100-260/0520
–
80/110/150/199
1. Adjust propane supply regulator provided by gas supplier for
14" (355 mm) w.c. maximum pressure.
2. Pressure required at gas valve inlet pressure port, see
Figure 93, page 102:
a. Maximum: 14" (355 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
ECO Tec 80: 3½" (89 mm) w.c.
ECO Tec 110: 3½" (89 mm) w.c.
ECO Tec 150/199: 3½" (89 mm) w.c.
c. Nominal gas pressure: 11.0" (279 mm) w.c.
Pipe capacity for 0.60 specific gravity
natural gas; pipe length is in equivalent
feet.
Cubic feet per hour, natural gas, 0.60 specific gravity
10 132
20 92
30 73
40 N/A
50 N/A
75 N/A
100 N/A
150 N/A
Equivalent lengths of straight pipe for
typical gas line fittings.
inches
½
¾
1
1¼
1½
2
2½
B M
OILER ANUAL
Gas pressure 13" (330 mm) w.c. or less
Pressure drop 0.3 inches (7.6 mm) w.c
278 520 1050 1600
190 350 730 1100
152 285 590 890
130 245 500 760
115 215 440 670
105 175 360 545
96 150 305 460
90 120 250 380
3.6 2.2 1.7
4.4 2.3 2.4
5.2 2.7 3.2
6.6 3.2 4.6
7.4 3.4 5.6
8.5 3.6 7.7
9.3 4.0 9.3
.
3050 4800
2100 3300
1650 2700
1450 2300
1270 2000
1020 1650
870 1400
710 1130
4.2
5.3
6.6
8.7
9.9
12.0
13.0
19