21
Installing the Water Heater
Typical Propane Gas piping examples:
2 Stage System with Multiple
Regulators (Recommended)
Gas Regulators
(2 Stage)
Low Pressure
Regulator
(before entering
home or building)
High
Pressure
Regulator
Gas Tank
Full Size
Gas Pipe
Full Port
Gas
Shut-Off
Valve
Single Regulator System
Gas Regulator
12 in W.C.
Gas Tank
Full Size
Gas Pipe
Full Port
Gas
Shut-Off
Valve
Full Size Gas Pipe
Pipe
Note
●
Tighten the water heater connection
valves with care to avoid damage.
●
The gas connection fitting on all
water heaters is
3
/
4
in.
●
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.
NOTICE
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 will not allow for a full
flow of gas to the water heater and may cause
improper operation.
CLOSE:
195
MAX OPER:
135
BYPASS: 5
KBTU /HR
CLOSE:
195
MAX OPER: 135
BYPASS: 5
KBTU /HR
Excess Flow Valve
Summary of Contents for NHW700
Page 83: ...Memo...
