Navien NR-180A, Operation & Installation Manual

Page: 27 / 89

INSTALLATION
27
Gas Piping:
Navien recommends the Water Heater be the first appliance installed
downstream of the gas meter
to ensure it will have sufficient gas supply.
Use the charts on the following pages to properly size the gas supply line.
The gas connection fitting on all Navien units is ¾”. DO NOT use less than ¾” piping.
When using flexible gas line, ensure the pipe’s inner diameter is sufficient to supply
the required BTUs, also ensure that the flexible line has no crimps or tight bends this
will restrict gas flow.
Install a full port on the gas supply line and the water heater.
When using rigid pipe, Navien recommends the installation of a union on the gas
supply pipe close to the water heater to facilitate any future maintenance and service.
LP Gas Piping Installation.
-. Regular System
1 2 0
3 4 5 6
9 8
7 1 2 0
3 4 5 6
9 8
7 1 2 0
3 4 5 6
9 8
7 1 2 0
3 4 5 6
9 8
7
1 2 0 3
4 5 6
9 8
7 1 2 0 3
4 5 6
9 8
7
Gas supply
Gas
regulator
Furnace
Domestic
gas stove
Pipe size: Min. 3/4 inch
(inner diameter)
Navien recommeds that the water
heater be the first appliance to be
connected to the gas meter/gas
regulator.
Gas inlet adapter
Union
Total capacity of connected appliances Gas meter’s capacity
Bottom view
Full Size Pipe
1/4"~3/8" Pipe
Gas Regulator
(Supply Press. 12") Full Size Pipe
Gas Tank