Connecting The Gas Supply - Navien NFC-175 Installation & Operation Manual

4. Connecting the Gas Supply

WARNING
Before connecting the gas supply, determine the gas type
●
and pressure for the boiler by referring to the rating plate. Use
only the same gas type indicated on the rating plate. Using
a different gas type will result in abnormal combustion and
malfunction of the boiler. Gas supplies should be connected
by a licensed professional only.
The appliance and its gas connection must be leak tested
●
before placing the appliance in operation.
This boiler cannot be converted from natural gas to propane
●
or vice versa without a Navien gas conversion kit. Do not
attempt a field conversion of this boiler without a Navien gas
conversion kit. Doing so will result in dangerous operating
conditions and will void the warranty.
Navien recommends connecting the boiler as the first appliance
downstream of the gas meter, to ensure a sufficient gas supply.
Gas meter capacity ≥ The total
capacity of connected appliances
Gas Supply Line
The boiler is
recommended to be
the first appliance to
be connected to the
gas supply line.
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.
Refer to the instructions provided with the gas
Note
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.
Tighten the boiler connection valves with care to
Note
avoid damage.
Gas Supply
Gas Inlet Adapter
Bottom View
1 3
Pipe size: / "– / "
2 4
(inner diameter)
Gas Shut off
Valve
Union
Connecting the Gas Supply 47