Gas Piping - Weil-McLain GOLD CGt Manual

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
5

Gas piping

Connecting gas supply piping to boiler
1. Remove jacket front panel and refer to
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
c. Install manual shutoff valve
jacket when required by local codes or utility requirements.
d. In Canada — When using manual main shutoff valve, it
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,
for leaks .
a. Close manual main shutoff valve
less than 13" w.c.
b. Disconnect boiler and gas valve from gas supply piping
any pressure testing greater than 13" w.c.
Do not check for gas leaks with an open flame
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
8
Figure 24 to pipe gas to boiler.
for servicing, when required.
in gas supply piping outside boiler
check boiler and its gas connection
during any pressure testing at
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.
Sizing gas supply piping
must be
Table 7
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 Z3.1 (or B149.1
or B149. for Canadian installations).
. Inlet pressure required at gas valve inlet:
• Maximum: 13" w.c.
during
• Minimum: 5" w.c.
• Manifold gas pressure: 3.5" w.c.
— use
3. Install 100% lockup gas pressure regulator in supply
line if inlet pressure exceeds 13" w.c.
13" w.c. maximum.
Figure 24 Gas supply piping
Failure to apply pipe dope as detailed
above can result in severe personal
injury, death or substantial property
damage.
for pipe length and diameter. Base
Table 7 specific
is only for gas with
For additional gas pipe
Adjust for
Part Number 550-110-290/0107