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CGi
GAS-FIRED WATER BOILER — SERIES 3 —
5
Gas piping
Connecting gas supply piping to
boiler
1. Remove jacket front panel and refer to
to boiler.
Install drip leg
a.
at inlet of gas connection to boiler.
Where local utility requires drip leg to be extended to
the floor, use appropriate length of pipe between cap
and tee.
Install ground joint union
b.
quired.
Install manual shutoff valve
c.
side boiler jacket when required by local codes or utility
requirements.
In Canada
d.
— When using manual main shutoff valve, it
must be identified
by the installer.
Support piping
2.
with hangers, not by boiler or its accessories.
3.
Purge all air
from gas supply piping.
4. Before placing boiler in operation,
connection for leaks
.
Close manual main shutoff valve
a.
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 substantial property
damage.
Use pipe dope compatible with propane gases.
5.
sparingly only to male threads of pipe joints so that pipe dope
does not block gas flow.
Failure to apply pipe dope
can result in severe personal injury, death or
substantial property damage.
Table 7 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"
¾"
10
132
278
20
92
190
30
73
152
40
63
130
50
56
115
75
45
93
100
38
79
150
31
64
30
Figure 26
to pipe gas
for servicing, when re-
in gas supply piping out-
check boiler and its gas
during any pressure
Apply
as detailed above
1"
1¼"
1½"
520
1050
1600
350
730
1100
285
590
860
245
500
760
215
440
670
175
360
545
150
305
460
120
250
380
Boiler Manual
Natural Gas:
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
pressure drop through the gas piping of 0.30" w.c.
additional gas pipe sizing information, refer to ANSI Z223.1/
NFPA 54 (or B149.1 or B149.2 for Canadian Natural Gas and
Propane Installation Code).
2. 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
inlet pressure exceeds 13" w.c.
mum.
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 26 Gas supply piping
specific gravity 0.60, with a
Adjust for 13" w.c. maxi-
Part Number 550-142-902/1016
For
if
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