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Part number 550-100-260/0520
19
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
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.
inches
½
3.6 2.2 1.7 4.2
¾
4.4 2.3 2.4 5.3
1
5.2 2.7 3.2 6.6
1¼
6.6 3.2 4.6 8.7
1½
7.4 3.4 5.6 9.9
2
8.5 3.6 7.7 12.0
2½
9.3 4.0 9.3 13.0
Cubic feet per hour, natural gas, 0.60 specific gravity
Gas pressure 13" (330 mm) w.c. or less
Pressure drop 0.3 inches (7.6 mm) w.c
.
10 132 278 520 1050 1600 3050 4800
20 92 190 350 730 1100 2100 3300
30 73 152 285 590 890 1650 2700
40 N/A 130 245 500 760 1450 2300
50 N/A 115 215 440 670 1270 2000
75 N/A 105 175 360 545 1020 1650
100 N/A 96 150 305 460 870 1400
150 N/A 90 120 250 380 710 1130
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.
Equivalent lengths of straight pipe for
typical gas line fittings.
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