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6. Connect the gas supply line.
7. Test the supply line, all connection points, and
the boiler for gas leaks.
Tighten the boiler connection valves
Note
with care to avoid damage.
Gas Supply
Gas Inlet Adapter
Bottom View
CAUTION
Install a manual gas shut-off valve between
●
the gas supply line and the boiler.
A sediment trap must be provided upstream
●
of the gas controls.
Note
Gas Shut off
Valve
Union
Prior to using an excess flow valve (EFV) in the
gas line, check the manufacturer's minimum and
maximum flow capacity rating. An improperly
sized EFV will not allow for a full flow of gas to
the boiler and may cause improper operation.
Tighten the boiler connection valves
●
with care to avoid damage.
The gas connection fitting on all
●
boilers is
/
in.
3
4
/
in rigid pipe can be used; refer to
1
●
2
the sizing tables on the proceeding
pages for limitations. Do not use
corrugated connectors or tubing as
noise may occur.
Corrugated Connector
When using flexible gas lines, ensure
●
that the pipe's inner diameter and
connector is sufficient to supply the
required BTUs. Also, ensure that the
flexible line has no crimps or tight
bends in it, as this will restrict gas flow.
When using rigid pipe, Navien
●
recommends the installation of a
union on the gas supply line close
to the boiler, to facilitate any future
maintenance or service.
CAUTION
CLOSE:
MAX OPER: 135
BYPASS:
CLOSE:
195
MAX OPER:
135
BYPASS:
5
Excess Flow Valve
Connecting the Gas Supply
/
in
1
2
195
5
49
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