16 Installing the Water Heater
To connect the gas supply:
1. Determine the gas type and pressure for the water heater 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.
5. Install full port valves on the gas supply line and water heater.
6. Connect the gas supply line.
7. Test the supply line, all connection points, and the water
heater for gas leaks.
Union
Gas Shutoff Valve
Gas Supply
Gas Inlet Adapter
Bottom View
Pipe size :
1
/
2
in to
3
/
4
in
(inner diameter)
3.3 Connecting the Gas Supply
WARNING
Before connecting the gas supply, determine the gas type
and pressure for the water heater 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 water heater. 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 water heater 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 water heater
without a Navien gas conversion kit. Doing so will result in
dangerous operating conditions and will void the warranty.
Navien recommends connecting the water heater as the first water
heater downstream of the gas meter, to ensure a sufficient gas
supply.
The water heater is
recommended to be the first
appliance to be connected
to the gas supply line.
Gas Supply Line
Gas meter’s capacity ≥ Total gas
capacity of connected appliances
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