Navien NPE-240A Installation Manual page 16

Tighten the water heater connection valves with
Note
●
care to avoid damage.
The gas connection fitting on all water heaters is
●
3/4".
1/2" rigid pipe can be used; refer to the sizing
●
tables on the proceeding pages for limitations.
Avoid using 1/2" corrugated connectors or tubing
as noise may occur.
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.
CAUTION
Prior to using an excess flow valve (EFV) in the gas line, check
the manufacturer's minimum and maximum flow capacity
rating. An improperly sized EFV wil not allow for a full flow of
gas to the water heater and may cause improper operation.
CLOSE:
MAX OPER:
BYPASS:
16 Installing the Water Heater
Corrugated Connector
CLOSE: 195
MAX OPER: 135
BYPASS: 5
195
135
5
Excess Flow Valve
Typical LP Gas piping examples:
●
Gas Regulator
(12" WC)
1/4"~3/8" Pipe
Gas Tank
Single Regulator System
Gas Regulators
1/2"~3/8" Pipe
2 PSI
1/2" Pipe
Gas Tank
2-lb. System with Multiple Regulators
Full size
Gas Pipe
Full size Gas Pipe
Full size
12" W.C.
Gas Pipe