Navien NCB-190/060H, Руководство по установке и эксплуатации

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52 Connecting the Gas Supply
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
●
Tighten the boiler connection valves
with care to avoid damage.
●
The gas connection fitting on all
boilers is
3
/
4
in.
●
1 /
2
in rigid pipe can be used; refer to
the sizing tables on the proceeding
pages for limitations. Do not use
1
/
2
in
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.
●
Check with the local jurisdiction to
verify whether the use of
1
/
2
” gas pipe
is approved in the area.
To connect the gas supply:
1. Determine the gas type and pressure for the
boiler by referring to the rating plate.
2. Perform a pressure test on the main gas supply
line.
3. Purge the gas line of any debris.
4. Determine the proper size and type for the gas
line. Refer to the tables that follow.
Note
Refer to the instructions provided
with the gas regulator for the
minimum pipe distance between the
regulator and the appliance.
5. Install certified full port valves on the gas supply
line and boiler.
6. Connect the gas supply line.
7. Test the supply line, all connection points, and
the boiler for gas leaks.
Note
Tighten the boiler connection valves
with care to avoid damage.
Gas Inlet Adapter
Bottom View
Union
Gas Shut off
Valve
Gas Supply
Pipe size: 1 /
2
”– 3 /
4
”
(inner diameter)