Connecting The Gas Supply - Navien NFB-175H Installation 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.
48 Connecting the Gas Supply
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
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
Note
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.
The boiler is
recommended to be
the first appliance to
be connected to the
gas supply line.