Gas Piping - Weil-McLain CGa 3 Series Manual

CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
4

Gas piping

Connect gas supply piping to boiler
1. Remove jacket front panel and refer to
Install drip leg
a. at inlet of gas connection to boiler. Where local
utility requires drip leg to be extended to the floor, use appropri-
ate length of pipe between cap and tee.
Install ground joint union
b.
Install manual shutoff valve
c.
jacket when required by local codes or utility requirements.
d. In Canada — When using manual main shutoff valve, it
identified
by the installer.
2. Support piping with hangers, not by boiler or its accessories.
Purge all air
3. from gas supply piping.
4. Before placing boiler in operation,
tion for leaks .
Close manual main shutoff valve
a.
less than 13" w.c.
Disconnect boiler and gas valve from gas supply piping
b.
ing any pressure testing greater than 13" w.c.
Do not check for gas leaks with an open flame
Use bubble test. Failure to use bubble test or check for
gas leaks can cause severe personal injury, death or
substantial property damage.
Use pipe dope compatible with propane gases.
5.
to male threads of pipe joints so that pipe dope does not block gas flow.
Failure to apply pipe dope
in severe personal injury, death or substantial property
damage.
Table 4 Pipe capacity for 0.60 specific gravity natural gas
Capacity of pipe for pipe size of:
Gas pipe
(Capacity in cubic feet gas per hour)
length
(feet)
½"
10 132
20 92
30 73
40 63
50 56
75 45
100 38
150 31
26
Figure 19 to pipe gas to boiler.
for servicing, when required.
in gas supply piping outside boiler
check boiler and its gas connec-
during any pressure testing at
Apply sparingly only
as detailed above can result
¾" 1" 1¼"
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
93 175 360
79 150 305
64 120 250
Natural Gas:
Table 4
1. Refer to
on rated boiler input (divide by 1,000 to obtain cubic
feet per hour).
gravity 0.60, with a pressure drop through the
gas piping of 0.30" w.c.
sizing information, refer to ANSI Z223.1 (or B149.1
or B149.2 for Canadian installations).
2. Inlet pressure required at gas valve inlet:
must be
• Maximum: 13" w.c.
• Minimum: 5" w.c.
• Manifold gas pressure: 3.5" w.c.
3. Install 100% lockup gas pressure regulator in supply
if inlet pressure exceeds 13" w.c.
line
13" w.c. maximum.
dur-
Propane Gas:
1. Contact gas supplier to size pipes, tanks and 100%
—
lockup gas pressure regulator.
2. Adjust propane supply regulator provided by gas
supplier for 13" w.c. maximum pressure.
3. Inlet pressure required at gas valve inlet:
• Maximum: 13" w.c.
• Minimum: 11" w.c.
• Manifold gas pressure: 10" w.c.
Figure 19 Gas supply piping
1½"
1600
1100
860
760
670
545
460
380
for pipe length and diameter. Base
Table 4 is only for gas with specific
For additional gas pipe
Adjust for
Part Number 550-142-300/0520