ENGLISH
INSTRUCTIONS
WATTS
PRESSURE GAUGE
(2 PLACES)
WATTS
SHUTOFF VALVE
(2 PLACES)
WATTS
BACKFLOW
PREVENTER
WATTS
PRESSURE
REGULATOR
(2 PLACES)
WATER
METER
SUPPLY
TO FIXTURES
TO
SILLCOCK
WATTS
PRESSURE GAUGE
(2 PLACES)
WATTS
SHUTOFF VALVE
(2 PLACES)
WATTS
BACKFLOW
PREVENTER
WATTS
PRESSURE
REGULATOR
WATER
METER
SUPPLY
TO FIXTURES
TO
SILLCOCK
Installation Instructions
1. The valve should be installed by a licensed contractor in accordance with local
codes and ordinances.
2. This valve should be installed where it is accessible with sufficient clearance
for cleaning, service, or adjustment.
3. Before installing the valve, be sure that the pipe ends are reamed and threads
are cut to size.
4. Flush the lines to remove all loose scale, dirt and other foreign matter that
can damage or clog the valve.
5. Install the regulator with the arrow on the body pointing in the direction of the flow.
6. Regulator may be installed vertically or horizontally (upright or inverted).
7. Start Up — Open cold water supply then hot water supply. Inspect for leaks.
Note:
The valve should be inspected annually to assure maximum
life and performance.
Note:
N45BDU-EZ – This valve is not suitable for outdoors or PIT installations.
Maintenance Instructions
• To clean strainer or replace seat/stem module shut off supply, loosen knob
retaining screw and back off adjusting knob.
• Remove Spring Cage, Spring, Washer and Slip Ring. Grasp Stem Nut with
fingers or pliers and lift module from body.
• Replace module and reassemble valve.
• Readjust pressure setting.
Adjustment
Regulator is factory preset to 50psi. To adjust pressure setting, loosen the knob
retaining screw and turn the adjusting knob clockwise to increase pressure,
counter clockwise to decrease pressure.
CAUTION:
Any time a reducing valve is adjusted, the use of a pressure gauge is
recommended to verify correct pressure setting.
Typical Installation
Series Installation
Series installations are recommended where very high supply
pressure must be reduced to a very low downstream pressure.
Reducing the pressure in stages eliminates whistling and noise.
Parallel Installation
Parallel installations are recommended where high flow or low flow
demand is intermittent/occasional. They are also used for installa-
tions where service cannot be interrupted.
IS-N45BDU-EZ-1
1
⁄
4
"-2"
1013
EDP# 1915353
© 2010
Watts
USA:
815
Chestnut
St.,
No.
Andover,
MA
01845-6098;
www.watts.com
Canada:
5435
North
Service
Rd.,
Burlington,
ONT.
L7L
5H7;
www.wattscanada.ca
Lim
ite
d W
arr
ant
y:
W
atts
Re
gul
ato
r C
o. (
the
“C
om
pan
y”)
w
arr
ant
s e
ach
pr
odu
ct t
o b
e fr
ee
fro
m d
efe
cts
in
mat
eria
l a
nd
wor
km
ans
hip
un
der
no
rm
al u
sag
e fo
r a
pe
rio
d o
f o
ne
yea
r fr
om
th
e d
ate
of
or
igi
nal
sh
ip-
men
t.
In
the
ev
ent
of
su
ch
def
ect
s w
ith
in
the
w
arr
ant
y p
erio
d, t
he
Com
pan
y w
ill,
at
its
op
tio
n, r
epl
ace
or
rec
ond
itio
n th
e p
rod
uct
w
ith
out
ch
arg
e.
THE
W
ARR
ANT
Y
SET
F
ORT
H
HER
EIN
I
S
GIV
EN
EXP
RES
SLY
A
ND
IS
THE
O
NLY
W
ARR
ANT
Y
GIV
EN
BY
THE
C
OM
PAN
Y W
ITH
R
ESP
ECT
T
O T
HE
PRO
DUC
T.
T
HE
COM
PAN
Y M
AKE
S N
O O
THE
R
WAR
RAN
TIE
S,
EXP
RES
S O
R I
MPL
IED
.
THE
C
OM
PAN
Y H
ERE
BY
SPE
CIF
ICA
LLY
D
ISC
LAI
MS
ALL
OTH
ER
WAR
RAN
TIE
S,
EXP
RES
S O
R I
MPL
IED
, I
NCL
UDI
NG
BUT
N
OT
LIM
ITE
D T
O T
HE
IM
PLI
ED
WAR
RAN
TIE
S O
F M
ERC
HAN
TAB
ILI
TY
AND
FI
TNE
SS
FOR
A
PAR
TIC
ULA
R P
URP
OSE
.
The
re
med
y d
esc
rib
ed
in
the
fi
rst
p
ara
gra
ph
of
thi
s w
arr
ant
y s
hal
l c
ons
titu
te
the
so
le
and
e
xcl
usi
ve
rem
edy
fo
r b
rea
ch
of
war
ran
ty,
an
d t
he
Com
pan
y s
hal
l n
ot
be
res
pon
sib
le
for
an
y in
cid
ent
al,
spe
cia
l
or
con
seq
uen
tia
l d
am
age
s, i
ncl
udi
ng
with
out
lim
ita
tio
n, l
ost
pr
ofit
s o
r th
e c
ost
of
re
pai
rin
g o
r r
epl
aci
ng
oth
er p
rop
erty
w
hic
h is
da
mag
ed
if t
his
pr
odu
ct d
oes
no
t w
ork
pr
ope
rly
, o
the
r c
ost
s re
sul
tin
g fr
om
la
bor
cha
rge
s, d
ela
ys,
va
nda
lis
m, n
egl
ige
nce
, fo
ulin
g c
aus
ed
by
for
eig
n m
ate
ria
l, d
am
age
fr
om
ad
ver
se
wat
er
con
diti
ons
, c
hem
ica
l, o
r a
ny
oth
er c
irc
um
sta
nce
s o
ver
w
hic
h th
e C
om
pan
y h
as
no
con
tro
l.
Thi
s w
arr
ant
y
sha
ll b
e in
val
ida
ted
by
an
y a
bus
e, m
isu
se,
m
isa
ppl
ica
tio
n, i
mpr
ope
r in
sta
lla
tio
n o
r im
pro
per
m
ain
ten
anc
e
or
alte
rat
ion
of
th
e p
rod
uct
.
Som
e S
tat
es
do
not
al
low
lim
ita
tio
ns
on
how
lo
ng
an
im
plie
d w
arr
ant
y la
sts
, a
nd
som
e S
tat
es
do
not
al
low
the
ex
clu
sio
n o
r li
mita
tio
n o
f in
cid
ent
al o
r c
ons
equ
ent
ial
da
mag
es.
T
her
efo
re
the
ab
ove
lim
ita
tio
ns
may
not
ap
ply
to
yo
u.
Thi
s L
im
ite
d W
arr
ant
y g
ive
s y
ou
spe
cifi
c le
gal
rig
hts
, a
nd
you
m
ay
hav
e o
the
r r
igh
ts
tha
t v
ary
fr
om
S
tat
e t
o S
tat
e.
Yo
u s
hou
ld
con
sul
t a
ppl
ica
ble
st
ate
la
ws
to
det
erm
ine
yo
ur
rig
hts
.
SO
FAR
AS
IS
CO
NSI
STE
NT
WIT
H A
PPL
ICA
BLE
ST
ATE
LA
W, A
NY
IM
PLI
ED
WAR
RAN
TIE
S T
HAT
M
AY
NOT
BE
DIS
CLA
IM
ED,
IN
CLU
DIN
G T
HE
IM
PLI
ED
WAR
RAN
TIE
S O
F M
ERC
HAN
TAB
ILI
TY
AND
FI
TNE
SS
FOR
A P
ART
ICU
LAR
PU
RPO
SE,
A
RE
LIM
ITE
D IN
D
URA
TIO
N T
O O
NE
YEA
R F
ROM
TH
E D
ATE
O
F O
RIG
INA
L
SHI
PM
ENT
.
Bypass Feature
This regulator has a built-in thermal expansion bypass feature. This feature prevents
downstream pressure from rising to more than 10psi above the supply pressure.
Note:
The bypass feature will not prevent the pressure relief valve from opening on
the hot water supply system with pressure above 150psi (10.3 bar).
IS-N45BDU-EZ-1
1
⁄
4
"-2"
1013
EDP# 1915353
© 2010
Watts
USA:
815
Chestnut
St.,
No.
Andover,
MA
01845-6098;
www.watts.com
Canada:
5435
North
Service
Rd.,
Burlington,
ONT.
L7L
5H7;
www.wattscanada.ca
Gar
ant
ía
lim
ita
da:
W
atts
R
egu
lat
or C
o. (
en
ade
lan
te,
“l
a C
om
pañ
ía”
) g
ara
ntiz
a, p
or u
n p
erío
do
de
un
año
a
par
tir
de
la
fec
ha
de
em
bar
que
or
igi
nal
, q
ue
sus
pr
odu
cto
s e
stá
n lib
res
de
de
fec
tos
en
m
ate
ria
les
y m
ano
de
ob
ra
baj
o c
ond
icio
nes
de
us
o n
orm
al.
En
ca
so
de
que
se
en
cue
ntre
n ta
les
de
fec
tos
de
ntro
de
l p
erío
do
de
gar
ant
ía,
la
Com
pañ
ía
ree
mpl
aza
rá
o re
aco
ndi
cio
nar
á, a
su
el
ecc
ión
, e
l p
rod
uct
o s
in
cos
to
alg
uno
.
LA
GAR
ANT
ÍA
AQU
Í E
STI
PUL
ADA
S
E O
TOR
GA
EN
FOR
MA
EXP
RES
A Y
E
S L
A Ú
NIC
A G
ARA
NTÍ
A
OTO
RGA
DA
POR
LA
CO
MPA
ÑÍA
EN
RE
LAC
IÓN
CO
N E
L P
ROD
UCT
O.
LA
COM
PAÑ
ÍA
NO
OTO
RGA
NI
NGU
NA
OTR
A G
ARA
NTÍ
A,
YA
SEA
E
XPR
ESA
O
IM
PLÍ
CIT
A.
L
A C
OM
PAÑ
ÍA
POR
L
A P
RES
ENT
E R
ENU
NCI
A
ESP
ECÍ
FIC
AM
ENT
E A
T
ODA
S L
AS
DEM
ÁS
GAR
ANT
ÍAS
, E
XPR
ESA
S O
IM
PLÍ
CIT
AS,
IN
CLU
YEN
DO
SIN
LIM
ITA
CIÓ
N, L
AS
GAR
ANT
ÍAS
IM
PLÍ
CIT
AS
DE
APT
ITU
D P
ARA
LA
CO
MER
CIA
LIZ
ACI
ÓN
E ID
ONE
IDA
D P
ARA
UN
PRO
PÓS
ITO
EN
PA
RTI
CUL
AR.
La
sol
ució
n d
esc
rita
e
n e
l p
rim
er
pár
raf
o d
e e
sta
g
ara
ntía
c
ons
titu
irá
la
ú
nica
y
e
xclu
siva
s
olu
ció
n p
or
inc
um
plim
ien
to
de
gar
ant
ía,
y
la
C
om
pañ
ía
no
se
har
á r
esp
ons
abl
e p
or
dañ
os
acc
ide
nta
les
, e
spe
cia
les
o
ind
ire
cto
s, i
nclu
yen
do
sin
lim
ita
ció
n, l
a p
érd
ida
de
ga
nan
cia
s o
el
co
sto
de
re
par
ació
n o
re
em
pla
zo
de
otra
pro
pie
dad
qu
e re
sul
te
dañ
ada
po
r e
l m
al f
unc
ion
am
ien
to
de
est
e p
rod
uct
o, o
tro
s c
ost
os
res
ulta
nte
s p
or m
ano
de
obr
a, r
eta
rdo
s, v
and
alis
mo,
ne
glig
enc
ia,
ob
stru
ccio
nes
oc
asio
nad
as
por
m
ate
ria
les
ex
tra
ños
, d
año
s d
ebi
dos
a c
ond
icio
nes
ad
ver
sas
de
l a
gua
, q
uím
ico
s o
cu
alq
uie
r o
tra
ci
rcu
nst
anc
ia
sob
re
la
cua
l la
Co
mpa
ñía
no
te
nga
con
tro
l.
E
sta
g
ara
ntía
n
o t
end
rá
val
ide
z e
n c
ual
qui
er
cas
o d
e a
bus
o,
uso
in
deb
ido
, a
plic
ació
n i
nco
rre
cta
,
ins
tal
ació
n in
ade
cua
da,
o
man
ten
im
ien
to
ade
cua
do
o a
lte
rac
ión
de
l p
rod
uct
o.
Alg
uno
s E
sta
dos
no
pe
rm
ite
n lim
ita
cio
nes
en
la
dur
ació
n d
e u
na
gar
ant
ía
im
plíc
ita
y a
lgu
nos
Es
tad
os n
o p
erm
ite
n
la
exc
lus
ión
o
lim
ita
ció
n d
e d
año
s a
ccid
ent
ale
s o
in
dire
cto
s.
P
or
lo
tan
to,
e
s p
osib
le
que
la
s li
mita
cio
nes
ant
erio
res
n
o s
ean
ap
lica
ble
s e
n s
u c
aso
.
Est
a g
ara
ntía
lim
ita
da
le
da
der
ech
os
leg
ale
s e
spe
cífic
os;
us
ted
pod
ría
te
ner
ta
mbi
én
otro
s d
ere
cho
s q
ue
var
ían
se
gún
el
Es
tad
o.
Ust
ed
deb
e c
ons
ulta
r la
s le
yes
es
tat
ale
s
apl
ica
ble
s p
ara
d
ete
rm
ina
r s
us
der
ech
os.
EN
LA
MED
IDA
E
N Q
UE
SEA
C
ONG
RUE
NTE
C
ON
LAS
L
EYE
S
EST
ATA
LES
AP
LIC
ABL
ES,
CU
ALQ
UIE
R G
ARA
NTÍ
A IM
PLÍ
CIT
A Q
UE
NO
SEA
RE
CHA
ZAD
A, I
NCL
UYE
NDO
LA
S
GAR
ANT
ÍAS
IM
PLÍ
CIT
AS
DE
APT
ITU
D P
ARA
LA
CO
MER
CIA
LIZ
ACI
ÓN
E ID
ONE
IDA
D P
ARA
UN
PR
OPÓ
SIT
O E
N
PAR
TIC
ULA
R, S
E L
IM
ITA
EN
SU
DU
RAC
IÓN
A
UN
AÑO
A
PAR
TIR
DE
LA
FE
CHA
DE
L E
MBA
RQU
E O
RIG
INA
L.
US
A :
81
5 C
hes
tnu
t S
t.,
No.
A
ndo
ver
, M
A 0
184
5-6
098
; w
ww
.w
atts
.co
m
Can
ada
:
54
35
Nor
th
Ser
vic
e R
d.,
Bur
lin
gto
n, O
NT.
L7
L 5
H7;
w
ww
.w
atts
can
ada
.ca
Gar
ant
ie
lim
ité
e :
W
atts
Re
gul
ato
r C
o. (
la
« S
oci
été
»)
gar
ant
it q
ue
cha
cun
de
se
s p
rod
uits
es
t e
xem
pt d
e
vic
e d
e m
até
ria
u e
t d
e fa
bric
atio
n d
ans
de
s c
ond
itio
ns
nor
mal
es
d’u
tilis
atio
n p
our
un
e p
ério
de
d’u
n a
n à
com
pte
r d
e la
da
te
d’e
xpé
diti
on
d’o
rig
ine
. D
ans
l’é
ven
tua
lité
où
de
te
ls
vic
es
se
man
ife
ste
rai
ent
pe
nda
nt
la
pér
iod
e d
e g
ara
ntie
, la
So
cié
té,
à
sa
disc
rét
ion
, re
mpl
ace
ra
ou
rec
ond
itio
nne
ra
le
pro
dui
t s
ans
fra
is.
LA
PRÉ
SEN
TE
GAR
ANT
IE
EST
E
XPR
ESS
E E
T R
EPR
ÉSE
NTE
L
A S
EUL
E G
ARA
NTI
E O
FFE
RTE
P
AR
LA
SOC
IÉT
É P
OUR
C
E P
ROD
UIT
. L
A S
OCI
ÉTÉ
N
’OF
FRE
A
UCU
NE
AUT
RE
GAR
ANT
IE,
EX
PRE
SSE
O
U
TAC
ITE
. P
AR
LA
PRÉ
SEN
TE,
L
A S
OCI
ÉTÉ
R
EJE
TTE
S
PÉC
IFI
QUE
MEN
T T
OUT
E A
UTR
E G
ARA
NTI
E,
EXP
RES
SE
OU
TAC
ITE
, N
OTA
MM
ENT
T
OUT
E G
ARA
NTI
E T
ACI
TE
DE
QUA
LIT
É M
ARC
HAN
DE
OU
D’A
DAP
TAT
ION
À
UN
BUT
PA
RTI
CUL
IER
.
Le
rec
our
s d
écr
it d
ans
le
pr
em
ier
pa
rag
rap
he
de
cet
te
gar
ant
ie
con
stit
ue
le
seu
l re
cou
rs
à to
ute
vio
lat
ion
de
la
pré
sen
te
gar
ant
ie.
La
S
oci
été
ne
sa
ura
it
être
te
nue
re
spo
nsa
ble
de
to
ut
dom
mag
e a
cce
sso
ire
,
spé
cia
l o
u in
dire
ct,
y c
om
pris
, d
e f
aço
n n
on
lim
ita
tive
:
la
per
te
de
pro
fits
o
u le
co
ût
affé
ren
t à
la
rép
ara
tio
n o
u a
u re
mpl
ace
men
t d
’au
tre
s b
ien
s q
ui s
era
ien
t e
ndo
mm
agé
s p
ar s
uite
du
fo
nct
ion
nem
ent
inc
orre
ct d
udi
t p
rod
uit
; d
’au
tre
s c
oût
s ré
sul
tan
t d
e fr
ais
de
mai
n-d
’œ
uvr
e, d
e re
tar
ds,
de
va
nda
lism
e,
de
nég
lig
enc
e, d
’un
e o
bst
ruc
tio
n c
aus
ée
par
de
s m
até
ria
ux
étra
nge
rs,
de
do
mm
age
s c
aus
és
par
un
e
eau
im
pro
pre
, d
es
pro
dui
ts
chi
miq
ues
ou
pa
r to
ut a
utre
év
éne
men
t é
cha
ppa
nt a
u c
ont
rôl
e d
e la
So
cié
té.
La
pré
sen
te
gar
ant
ie
est
dé
cla
rée
nu
lle
et
no
n a
ven
ue
en
cas
d’
usa
ge
abu
sif
ou
inc
orre
ct,
d’a
ppl
ica
tio
n,
d’in
sta
lla
tio
n o
u d
’en
tre
tie
n in
cor
rec
ts
ou
de
mod
ific
atio
n d
u p
rod
uit.
Cer
tai
ns
Éta
ts
n’a
uto
rise
nt
pas
le
s l
im
ita
tio
ns
de
dur
ée
d’u
ne
gar
ant
ie
tac
ite
o
u l
’ex
clu
sio
n o
u l
a
lim
ita
tio
n d
es
dom
mag
es
acc
ess
oire
s o
u in
dire
cts
. L
es
lim
ita
tio
ns
sus
men
tio
nné
es
peu
ven
t d
onc
ne
pa
s
s’a
ppl
iqu
er à
vo
us.
Ce
tte
ga
ran
tie
lim
ité
e v
ous
do
nne
de
s d
roi
ts
spé
cifi
que
s e
t il
se
pe
ut q
ue
vou
s a
yez
aus
si d
’au
tre
s d
roi
ts
qui
va
rie
nt d
’un
Ét
at à
l’a
utre
. V
eui
lle
z v
ous
ré
fér
er a
ux
loi
s a
ppl
ica
ble
s d
e l’
Éta
t p
our
dét
erm
ine
r v
os
dro
its
en
la
m
atiè
re.
DAN
S L
A M
ESU
RE
PER
MIS
E P
AR
LA
LOI
AP
PLI
CAB
LE
DE
L’É
TAT
,
TOU
TES
LE
S G
ARA
NTI
ES
TAC
ITE
S N
E P
OUV
ANT
PA
S Ê
TRE
RE
JET
ÉES
, Y
CO
MPR
IS
LES
GA
RAN
TIE
S
TAC
ITE
S D
E Q
UAL
ITÉ
M
ARC
HAN
DE
ET
D’A
DAP
TAT
ION
À
U
N B
UT
PAR
TIC
ULI
ER,
S
ONT
LI
MIT
ÉES
QUA
NT
À L
EUR
DU
RÉE
À
UN
AN
À C
OM
PTE
R D
E L
A D
ATE
D’
EXP
ÉDI
TIO
N D
’OR
IGI
NE.
WATTS
PRESSURE GAUGE
(2 PLACES)
WATTS
SHUTOFF VALVE
(2 PLACES)
WATTS
BACKFLOW
PREVENTER
WATTS
PRESSURE
REGULATOR
(2 PLACES)
WATER
METER
SUPPLY
TO FIXTURES
TO
SILLCOCK
IS-N45BDU-EZ-1
1
⁄
4
"-2"
1013
EDP# 1915353
© 2010
Watts
S er
ies
N
45
BD
U-E
Z
S er
ie
N4
5B
DU
-E
Z
S ér
ie
N4
5B
DU
-E
Z
Wat
er P
res
sur
e R
edu
cin
g V
alv
e
Vál
vul
a re
duc
tor
a d
e la
pre
sió
n d
el a
gua
Rég
ula
teu
r d
e p
res
sio
n d
'ea
u
1
1
⁄
4
", 1
1
⁄
2
", 2
" (3
2, 4
0, 5
0m
m)
Ins
tal
lat
ion
In
str
uct
ion
s
Ins
tru
cci
one
s d
e in
sta
lac
ión
Ins
tru
ctio
ns
d’in
sta
lla
tio
n
IS-N45BDU-EZ-1
1
⁄
4
"-2"
N45
BD
U-E
Z
Repair Kits
KIT NO.
SIZE
ORDERING
KIT
IN.
MM
CODE
INCLUDES
1
1
⁄
4
– 2
1
1
⁄
4
, 1
1
⁄
2
, 2 32, 40, 50
0006988
SEAT/STEm
N45B/EZ-N55B-RK
moDULE
Stem Nut
Strainer
Knob Retaining Screw
Adjusting Knob
Indicator/
Spring Washer
Spring
Spring Cage
Slip Ring
Seat/Stem
Module
Seat/Stem Module
Troubleshooting
High System Pressure
If the downstream system pressure is higher than the set pressure under no
flow conditions, the cause could be thermal expansion, pressure creep or dirt/
debris on the seat.
Thermal expansion occurs whenever water is heated in a closed system. The
system is closed when supply pressure exceeds 150psi, or a check valve or
backflow preventer is installed in the supply piping.
You must make provisions for pressure relief protection
of your plumbing system and components. The use of a
relief valve such as the Watts 530C, BRV, Governor 80,
or 3L or potable water expansion tank such as the Watts
DET, PLT, ILH or DETA may be required.
To determine if this is the result of thermal expansion,
try briefly opening the cold water tap. If the increased
pressure is caused by thermal expansion, the pres-
sure will immediately be relieved and the system
will return to the set pressure.
Watts offers a pressure test gauge, model
276H300 to assist you in determining if you have
high water pressure. The 276H300 when attached
to a hose bibb registers the highest pressure read-
ing over the period of time it is left on the system.
Watts 276H300