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CGi
SERIES 4 — GAS-FIRED WATER BOILER —
5
Gas piping
Connecting gas supply piping to
boiler
1. Remove jacket front panel and refer to
gas to boiler.
a.
at inlet of gas connection to boiler.
Install drip leg
Where local utility requires drip leg to be extended
to the floor, use appropriate length of pipe be-
tween cap and tee.
b.
Install ground joint union
quired.
c.
Install manual shutoff valve
outside boiler jacket when required by local codes
or utility requirements.
d.
— When using manual main shutoff
In Canada
valve, it
must be identified
2.
with hangers, not by boiler or its acces-
Support piping
sories.
3.
from gas supply piping.
Purge all air
4. Before placing boiler in operation,
gas connection for leaks
a.
Close manual main shutoff valve
sure testing at less than 13" w.c.
b.
Disconnect boiler and gas valve from gas supply
during any pressure testing greater than 13"
piping
w.c.
Do not check for gas leaks with an open
— use bubble test. Failure to use
flame
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.
sparingly only to male threads of pipe joints so that pipe
dope does not block gas flow.
Failure to apply pipe dope
above 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
to pipe
Figure 26
for servicing, when re-
in gas supply piping
by the installer.
check boiler and its
.
during any pres-
Apply
as detailed
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
rated boiler input (divide by 1,000 to obtain cubic feet
per hour).
Table 7
0.60, with a pressure drop through the gas piping of 0.30"
For additional gas pipe sizing information, refer to
w.c.
ANSI Z223.1/NFPA 54 – latest edition (or B149.1 or
B149.2 for Canadian Natural Gas and Propane Instal-
lation 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
if inlet pressure exceeds 13" w.c.
maximum.
Propane Gas:
1. Contact gas supplier to size pipes, tanks and 100%
lockup gas pressure regulator.
2. Adjust propane supply regulator provided by gas sup-
plier 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
for pipe length and diameter. Base on
is only for gas with
specific gravity
Adjust for 13" w.c.
Part Number 550-142-302/0124
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