Navien CH-180 Installation Manual - Gas Piping:
Gas Piping:
29
Gas Piping Guidelines:
Navien recommends the combination Water Heater / Heating Boiler be the first appli-
ance 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 3/4".
DO NOT
use less than 3/4" 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 as this will
restrict gas flow.
Install a manual gas shut-off valve on the gas supply line and the Water Heater / Heating
Boiler.
When using rigid pipe, Navien recommends the installing a union on the gas supply line
close to the Water Heater / Heating Boiler to facilitate any future maintenance and
service.
A sediment trap must be provided upstream of the gas contols.
LP Gas Piping Installatinon
-. Regular System
GAS PIPING
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Gas supply
Gas
regulator
Furnace
Domestic
gas stove
Pipe size: Min. 3/4 inch
(inner diameter)
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
Navien recommends that the Combination water
heater / heating boiler be the first appliance to be
connected to the gas meter/gas regulator.
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