GOLD CGt Gas-Fired Water Boiler — Boiler Manual
8
Part Number
550-110-290/0107
Gas piping
5
Connecting gas supply piping to boiler
1. Remove jacket front panel and refer to
Figure 24
to pipe gas to boiler.
a.
Install drip leg
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.
b.
Install ground joint union
for servicing, when required.
c.
Install manual shutoff valve
in gas supply piping outside boiler
jacket when required by local codes or utility requirements.
d.
In Canada
— When using manual main shutoff valve, it
must be
identified
by the installer.
.
Support piping
with hangers, not by boiler or its accessories.
3.
Purge all air
from gas supply piping.
4. Before placing boiler in operation,
check boiler and its gas connection
for leaks
.
a.
Close manual main shutoff valve
during any pressure testing at
less than 13” w.c.
b.
Disconnect boiler and gas valve from gas supply piping
during
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 substan-
tial property damage.
Table 7
Pipe capacity for 0.60 specific gravity natural gas
Figure 24
Gas supply piping
5.
Use pipe dope compatible with propane gases.
Apply sparingly only to male threads of pipe joints
so that pipe dope does not block gas flow.
Failure to apply pipe dope
as detailed
above can result in severe personal
injury, death or substantial property
damage.
Sizing gas supply piping
1. Refer to
Table 7
for pipe length and diameter. Base
on rated boiler input (divide by 1,000 to obtain cubic
feet per hour).
Table 7
is only for gas with
specific
gravity 0.60, with a pressure drop through the
gas piping of 0.30” w.c.
For additional gas pipe
sizing information, refer to ANSI Z3.1 (or B149.1
or B149. for Canadian installations).
. Inlet pressure required at gas valve inlet:
• Maximum: 13” w.c.
• Minimum: 5” w.c.
• Manifold gas pressure: 3.5” w.c.
3. Install 100% lockup gas pressure regulator in supply
line
if inlet pressure exceeds 13” w.c.
Adjust for
13” w.c. maximum.
