Weil-McLain Eco Tec 80 User Manual

Part number 550-100-270/0122
19
ECO
®
Tec series 2 gas-fired water boiler – boiler manual

Boiler gas connection is ½" NPT. Size gas lines large
enough to provide gas to all connected appliances.


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 ttings to equivalent lengths using data
from Figure24.
b. Figure23 is only for natural gas with specic 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113,page124:
a. Maximum: 14" (355 mm) w.c. with no ow (lockup).
Minimum gas pressure, with gas owing (verify during
boiler startup, while boiler is at high re):
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.
b. 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.

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.

Contact gas supplier to size pipes, tanks and 100% lockup gas
pressure regulator.
Pipesize
inches
Equivalentlength,feet
90°Elbow Tee
short
radius
long
radius
line
ow
branch
ow
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
Gas
pipe
total
length,
feet
Capacity
Cubic feet per hour, natural gas, 0.60 specic gravity
Gas pressure 13" (330 mm) w.c. or less
Pressure drop 0.3 inches (7.6 mm) w.c
.
½" ¾" 1" 1¼" 1½" 2" 2½"
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113,page124:
a. Maximum: 14" (355 mm) w.c. with no ow (lockup).
Minimum gas pressure, with gas owing (verify during
boiler startup, while boiler is at high re):
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.
b. Nominal gas pressure: 11.0" (279 mm) w.c.
Figure23 Pipe capacity for 0.60 specic gravity natural
gas; pipe length is in equivalent feet.
Figure24 Equivalent lengths of straight pipe for typical
gas line ttings.

Weil-McLain Eco Tec 80 Specifications

General

Brand	Weil-McLain
Model	Eco Tec 80
Category	Boiler
Language	English