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insTallaTion
Gas Piping
1
Gas Supply Piping Connection
WARNING
!
Use two wrenches when tightening gas piping
at the boiler. Use one wrench to prevent the
2
boiler gas line connection from turning. Failure
to prevent the boiler gas connection pipe from
turning could damage gas line components,
which can result in severe personal injury, death,
or substantial property damage.
3
1
Connect the gas supply piping to the boiler See
Figure 44
a Install a union for servicing when required
b Install a manual shutoff valve in the gas supply
piping within 6 ft of the boiler
c In Canada, the manual gas valve must be
4
identified by the installer.
2
Support gas piping with hangers or other devices
Do not support the piping by the boiler or boiler
accessories
3
Use pipe dope compatible with propane gases
as natural gas may contain some propane Apply
pipe dope sparingly only to male threads of pipe
5
joints so that it does not block gas flow.
WARNING
!
Apply pipe dope as detailed in this section.
Failure to apply pipe dope properly can result
in severe personal injury, death, or substantial
6
property damage.
WARNING
!
SVF boilers are shipped ready to fire natural
gas ONLY. The propane conversion kit must
be installed if the boiler will be connected to
propane. See page 16 for instructions. Failure
7
to comply can result in severe personal injury,
death, or substantial property damage.
4
If any factory installed gas connections are
altered during installation, make sure to check for
leaks before operation See page 57 for more
8
information on checking for leaks
56
svf
series
725/850
Figure 44 Gas supply piping connection (fittings and gas
valve supplied by installer)
Boiler gas
Boiler gas
connection
connection
gas valve
gas valve
220068
5
If inlet pressure can exceed 14" W C at any time:
a Install a 100% lock up gas pressure regulator
as defined by ANSI Z21.80 in the gas supply
line Lock up regulators can have pressure
spikes of 5" W C or 150% of setting, whichever
is greater
b Adjust the lock up regulator for inlet pressure
below 10" W C with the boiler at minimum input
rate This setting provides a cushion below the
setting of the high gas pressure switch
c Gas pressure can be adjusted higher or lower
as needed
WARNING
!
A lock up regulator must be installed as detailed
if inlet pressure can exceed 14" W.C. Failure
to comply can result in severe personal injury,
death, or substantial property damage.
boiler manual
1
From gas supply
From gas supply
Union
Union
External
External
manual
manual
550-100-290/0124
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