Navien NPE-180A2 Installation Manual page 21

Tighten the water heater connection
Note
●
valves with care to avoid damage.
The gas connection fitting on all
●
water heaters is
/ in. rigid pipe can be used; refer to
1
●
2
the sizing tables on the proceeding
pages for limitations.
DO NOT use
connectors or tubing as noise may
occur.
[Corrugated Connector]
When using flexible gas lines, ensure
●
that the pipe's inner diameter and
connector is sufficient to supply the
required BTUs. Also, ensure that the
flexible line has no crimps or tight
bends in it, as this will restrict gas
flow.
When using rigid pipe, Navien
●
recommends the installation of a
union on the gas supply line close
to the water heater, to facilitate any
future maintenance or service.
Check with the local jurisdiction to
●
verify whether the use of
pipe is approved in the area.
/ in.
3
4
/ in. corrugated
1
2
/ in. gas
1
2
NOTICE
Prior to using an excess flow valve (EFV) in the
gas line, check the manufacturer's minimum
and maximum flow capacity rating.
improperly sized EFV will not allow for a full
flow of gas to the water heater and may cause
improper operation.
CLOSE:
MAX OPER: 135
BYPASS:
CLOSE: 195
MAX OPER: 135
BYPASS: 5
Excess Flow Valve
Installing the Water Heater
An
195
5
21