To Connect The Gas Supply - Navien NPE-180A2 Installation Manual

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 certified 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.
Gas
Supply
Gas Inlet Adapter
Bottom View
20 Installing the Water Heater
Note
Pipe Size: 1 / in
2
to 3 / in (inner
4
diameter)
Gas Shutoff
Valve
Union
Tighten the water heater connection
●
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
1
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.
CAUTION
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
/ in.
3
4
/ in corrugated
2
/ " gas
1
2
An
195
5