56 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.
●
To avoid damaging the connectors on the
boiler, use two wrenches when tightening
piping to the boiler. Use one wrench to
prevent the boiler’s connector from turning,
and use the other wrench to tighten the
connection. Damaged connectors may result
in system leaks.
●
Properly support the piping with hangers. Do
not allow the piping to be supported by the
boiler or its accessories.
●
Ensure that the gas piping is protected from
physical damage and freezing where required.
Failure to follow these instructions could result
in gas leakage and result in fire, explosion,
property damage, severe personal injury, or
death.
●
The appliance and its gas connection must
be leak tested before placing the appliance in
operation.
●
To avoid danger from explosion and fire,
do not use a flame to check for a gas leak.
Perform a bubble test on the joints to check
for gas leaks. If a leak exists, bubbles will form
at the leaking joint. A gas leak could result in
substantial property damage, severe personal
injury, or death.
●
Immediately turn off the boiler and stop the
gas supply if a gas leak is detected. Perform a
bubble test to find the leak and repair the leak
immediately. Do not start the boiler again until
the leak is repaired. Operating the boiler with
a gas leak could result in substantial property
damage, severe personal injury, or death.
●
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.
The boiler is
recommended to be
the first appliance to
be connected to the
gas supply line.
Gas meter capacity ≥ The total
capacity of connected appliances
Gas Supply Line
4. Connecting the Gas Supply
Summary of Contents for NFC-250/175H
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