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Example of a Typical Installation
(Direct & Non-Direct Vent)
The following illustration depicts an example of a common vent
system installed for a cascade system of 8 Navien NPE heater units.
Direct Vent
Non-Direct Vent
The illustration is intended for reference purposes
Note
only.
5.2 Navien Backflow Damper (Back-draft
Damper)
The Navien backflow damper prevents backflow (back-draft) at the
exhaust vent while the water heater unit operates.
By closing the exhaust vent as soon as the combustion cycle ends,
the Navien backflow damper retains heat in the system for longer
periods. This improves the system's thermal efficiency.
When using a common vent in a cascade system,
Note
backflow devices are required to prevent exhaust
from entering the building.
Included Items
Backflow Damper
Installation Manual
Ready-Link
communication
cable
Screw (4 ea)
Specifications
Part Name
Backflow Damper
Part No.
30014367A
Material
PP (Polypropylene)
Cond ensin
g Wate
Co mm
r Heat er
on Ve nt
Ins tal lat
Sy ste m
ion Ma
For NPE
nu al
Seri es
Wat er
Hea ters
Certified
to ANSI
Keep this
Z21.10.3
– CSA
required
.
manual
for future
4.3. (Only
for U.S.
referenc
e whenev
installat
ions)
er mainten
WARN
ance or
service
ING
is
If the informa
injury,
or death.
tion in
these instruct
-
ions is
not followe
Do not
store or
d exactly,
-
WHAT
use gasolin
e or other
a fire or
●
Do not
TO DO
IF YOU
flamma
explosio
n may
try to light
SMELL
GAS
ble vapors
and liquids
result,
causing
Do not
●
touch
any applian
in the
propert
damage
y
●
Immed
iately call
any electric
ce.
vicinity
of this
, persona
l
If you cannot
●
your gas
al switch;
do not
or any
other applian
reach your
supplie
r from
use any
phone
ce.
-
Installa
tion and
gas supplie
a neighb
or's phone.
in your
buildin
service
r, call the
Follow
g.
-
This entire
manual
must be
perform
fire departm
the gas
supplie
mainte
nance
must be
ed by
a qualifie
ent.
r's instruc
-
The installa
of the
commo
left for
n vent
the consum
d installe
r, service
tions.
ANSI Z223.1/
tion must
system.
er. The
consum
agency
NFPA
conform
with local
er must
read and
or the
gas supplie
-
When
applica
54.
codes
or, in the
refer to
r.
Standa
rd, Title
ble, the
installa
absence
this manual
for proper
24 CFR,
Part 3280,
tion must
of local
codes,
operati
Mobile
conform
with the
the Nationa
on and
Homes.
Manufa
ctured
l Fuel
Gas Code,
Home
Constru
ction and
Safety
5.9" (150 mm)
1.1" (28 mm)
Installing a Common Vent System
53
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