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10. Handle pipe joint carefully until cement sets.
11. Support combustion air and vent piping a minimum
of every 5 feet using pre-formed metal hanging
straps. Do not rigidly support pipes. Allow for move-
ment due to expansion and contraction.
cHEcK gas supplY
taBlE #5 - gas sUPPlY PressUre
Pressure
Minimum
Maximum
Please check line pressure while unit is running.
The gas pipe to your boiler must be the correct size
for the length of run and for the total BTU per hour
input of all gas utilization equipment connected to it.
See tables #6a & #6B for proper size. Be sure your
gas line complies with local codes and gas company
requirements.
taBlE #6a - NatUral gas PiPiNg siZes
Pipe capacity - BtU/Hr. input
Pipe
length
½"
20'
92,000
40'
63,000
60'
50,000
taBlE #6B - ProPaNe gas PiPiNg siZes
Pipe capacity - BtU/Hr. input
Pipe
copper tubing
length
⅝"
20'
131,000
40'
90,000
60'
72,000
Includes Fittings
(1)
(2)
The boiler and its individual shutoff valve must be dis-
connected from the gas supply piping system during
any pressure testing of that system at test pressures
in excess of ½ psig (3.5kPa).
Viii. coMBUstioN air aND VeNt PiPe
notE: Rigid supports will cause excess noise in vent piping.
iX. gas sUPPlY PiPiNg
Natural gas Propane gas
4" w.c.
10" w.c.
10" w.c.
14" w.c.
(1)
¾"
1"
190,000
350,000
625,000
130,000
245,000
445,000
105,000
195,000
365,000
(1)
iron Pipe
(2)
¾"
½"
216,000
189,000
393,000
145,000
129,000
267,000
121,000
103,000
217,000
Outside Diameter
12. Slope combustion air and vent pipes toward boiler
a minimum of ¼" per linear foot with no sags be-
tween hangers.
13. Use appropriate methods to seal openings where
vent and combustion air pipes pass through roof
or side wall.
IMpoRtant: The length of pipe or tubing should
be measured from the gas meter or propane second
stage regulator.
connEctIng tHE gas pIpIng
Refer to Figure #12 for the general layout at the boil-
er. The gas line enters the boiler through the left side
panel.
1¼"
The boiler is equipped with a ½" NPT connection on
¾"
the gas valve for supply piping and ½" NPT ball cock
for manual shut off. The following rules apply:
1. Use only those piping materials and joining meth-
ods listed as acceptable by the authority having ju-
risdiction, or in the absence of such requirements,
by the National Fuel Gas Code, ANSI Z223.1-
latest revision. In Canada, follow the CAN/CGA
B149.1 and .2 Installation Codes for Gas Burning
Appliances and Equipment.
15
Figure #12
gas pIpIng
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