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CGi-4E Gas-Fired Water Boiler — Boiler Manual
30
Part Number 550-110-711/1108
Gas piping5
Table 7 Pipe capacity for 0.60 specific gravity natural gas
Natural Gas:
1. Refer to Table 7forpipelengthanddiameter.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
sizinginformation,refertoANSIZ223.1(orB149.1
orB149.2forCanadianinstallations).
2. Inlet pressure required at gas valve inlet:
• Maximum:13”w.c.
• Minimum:5”w.c.
• Manifoldgaspressure:3.50”w.c.athighre
(0.90”w.c.whileinlowreatstart-up)
3. Install100%lockupgaspressureregulatorinsupply
line
if inlet pressure exceeds 13” w.c. Adjust for
13”w.c.maximum.
Propane Gas:
1. Contactgassuppliertosizepipes,tanksand100%
lockup gas pressure regulator.
2. Adjust propane supply regulator provided by gas
supplierfor13”w.c.maximumpressure.
3. Inlet pressure required at gas valve inlet:
• Maximum:13”w.c.
• Minimum:11”w.c.
• Manifoldgaspressure:10”w.c.athighre
(3.50”w.c.whileinlowreatstart-up)
Connecting gas supply piping to boiler
1. Remove jacket front panel and refer to Figure 26 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.
2.
Support piping with hangers, not by boiler or its accessories.
3.
Purge all air from gas supply piping.
4. Beforeplacingboilerinoperation,
check boiler and its gas connection
for leaks
.
a.
Close manual main shutoff valve during any pressure testing at
lessthan13”w.c.
b.
Disconnect boiler and gas valve from gas supply piping dur-
inganypressuretestinggreaterthan13”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.
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.
Figure 26 Gas supply piping