index & notes - american water
TRANSCRIPT
2
Ind
ex &
No
tes
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
Ple
ase
No
te:
Ho
t w
ate
r sy
stem
s m
ust
be
des
ign
ed
by
a p
lum
bin
g e
ng
inee
r a
nd
inst
alle
d
by
a q
ua
lified
plu
mb
ing
pro
fess
ion
al.
Fo
llow
all
inst
alla
tio
n in
stru
ctio
ns
in t
he
ma
nu
al t
ha
t ca
me
wit
h y
ou
r w
ate
r h
eate
r. In
corr
ect
inst
all
ati
on
o
f w
ate
r h
eate
rs c
an
res
ult
in
pro
pe
rty
da
ma
ge,
bo
dil
y in
jury
o
r d
ea
th.
Am
eric
an
® W
ate
r H
eate
rs d
oes
no
t a
ccep
t a
ny
liab
ility
for
inco
mp
lete
, o
utd
ate
d o
r in
corr
ect
info
rma
tio
n
pro
vid
ed in
th
is p
ub
lica
tio
n.
If y
ou
ha
ve a
ny
qu
esti
on
s co
nce
rnin
g
the
inst
alla
tio
n o
f a h
ot
wa
ter
syst
em,
con
sult
a lo
cal p
lum
bin
g e
ng
inee
r w
ho
will
be
fam
ilia
r w
ith
co
de
req
uir
emen
ts in
yo
ur
are
a.
Sym
bo
l Leg
end
.....
......
......
......
......
......
......
......
3
Plu
mb
ing
Sys
tem
Co
mp
on
ent
Des
crip
tio
ns
......
......
......
......
......
......
......
......
.... 4
34
an
d 5
0-G
allo
n P
ola
ris®
P
ipin
g D
iag
ram
s ...
......
......
......
......
......
......
.6-1
7 S
ing
le P
ola
ris®
Inst
alla
tio
n ...
......
......
......
......
......
......
6 T
wo
Po
lari
s® In
stal
lati
on
.....
......
......
......
......
......
......
..7 T
hre
e Po
lari
s® In
stal
lati
on
.....
......
......
......
......
......
.....8
Fo
ur P
ola
ris®
Inst
alla
tio
n ..
......
......
......
......
......
......
....9
Sin
gle
Po
lari
s® w
ith
Sto
rag
e Ta
nk .
......
......
......
....1
0 T
wo
Po
lari
s® w
ith
Sto
rag
e Ta
nk .
......
......
......
......
..11
Sin
gle
Po
lari
s® w
ith
Tw
o S
tora
ge
Tan
ks ..
......
...12
Po
lari
s® w
ith
Dis
hw
ash
er ..
......
......
......
......
......
......
13 P
ola
ris®
wit
h B
oo
ster
Hea
ter .
......
......
......
......
......
.14
Tw
o P
ola
ris®
wit
h B
oo
ster
Hea
ter .
......
......
......
....1
5 P
ola
ris®
wit
h S
tora
ge
Tan
k an
d
B
oo
ster
Hea
ter..
......
......
......
......
......
......
......
......
......
.16
Co
mb
ined
Ap
plia
nce
Ap
plic
atio
n ...
......
......
......
.17
Rec
ircu
lati
on
Lo
op
s ....
......
......
......
......
......
....1
8
Seq
uen
ce o
f Op
erat
ion
s D
iag
ram
s ...
.....
19
-28
M
ult
iple
Po
lari
s® In
stal
lati
on
......
......
......
......
..19-
20 P
ola
ris®
Wat
er H
eate
r(s)
wit
h
S
tora
ge
Tan
k(s)
......
......
......
......
......
......
......
......
..21-
22 P
ola
ris®
Wat
er H
eate
r(s)
wit
h
B
oo
ster
Hea
ter(
s) ...
......
......
......
......
......
......
......
.23-
24 P
ola
ris®
Wat
er H
eate
r(s)
wit
h
S
tora
ge
Tan
k(s)
an
d B
oo
ster
Hea
ter(
s) ...
...25
-26
Pola
ris®
Wat
er H
eate
r wit
h D
ish
was
her
.....
..27-
28
3C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Sym
bo
l Leg
end
Th
erm
om
eter
Un
ion
Sh
uto
ff V
alve
Ch
eck
Val
ve(A
rro
w in
dic
ates
dir
ecti
on
of f
low
)
Mix
ing
Val
ve
An
ti-s
iph
on
Val
veW
ater
Ham
mer
Arr
este
rP
ress
ure
Red
uci
ng
Val
veLi
ne
Tem
per
atu
reC
on
tro
l
Plu
g C
ock
Exp
ansi
on
Tan
kB
ron
zeC
ircu
lati
ng
Pu
mp
Pip
ing
Dia
gra
m N
ote
s:
1.
If w
ater
ab
ove
120
°F is
su
pp
lied
for
do
mes
tic
use
(han
dw
ash
ing
, sh
ow
erin
g, e
tc.)
a
te
mp
erin
g v
alve
sh
ou
ld b
e in
stal
led
in t
he
ho
t w
ater
lin
e to
do
mes
tic
fixt
ure
s.
2.
If a
ch
eck
valv
e o
r a
no
n-b
ypas
s p
ress
ure
-red
uci
ng
val
ve is
inst
alle
d in
th
e co
ld w
ater
su
pp
ly
line,
an
exp
ansi
on
tan
k m
ust
be
inst
alle
d b
etw
een
th
e ch
eck
valv
e an
d t
he
wat
er h
eate
r's
cold
wat
er in
let.
3.
Wh
en u
sin
g a
sto
rag
e ta
nk
wit
h a
wat
er h
eate
r, u
se t
he
plu
g c
ock
to
ad
just
th
e fl
ow
of t
he
reci
rcu
lati
ng
lin
e b
etw
een
th
e st
ora
ge
tan
k an
d t
he
wat
er h
eate
r to
5 g
allo
ns
per
min
ute
.
4.
If r
ecir
cula
tin
g li
nes
are
use
d in
th
e b
uild
ing
, th
e fl
ow
rat
e sh
ou
ld b
e d
eter
min
ed b
y th
e
d
esig
n e
ng
inee
r an
d a
dju
sted
acc
ord
ing
ly.
5.
Wh
en r
equ
ired
, vac
uu
m r
elie
f val
ves
sho
uld
be
inst
alle
d p
er lo
cal c
od
e.
6.
Pip
e al
l T&
P v
alve
s to
an
op
en d
rain
in a
cco
rdan
ce w
ith
loca
l co
de
req
uir
emen
ts.
7.
Cir
cula
tin
g p
um
ps
sho
uld
be
bro
nze
an
d a
pp
rove
d fo
r p
ota
ble
wat
er.
8.
Prim
ary
hea
ter
tem
per
atu
re s
ho
uld
be
set
to a
t le
ast
130°
F.
9.
Pip
e si
ze fo
r al
l man
ifold
s sh
ou
ld b
e d
eter
min
ed b
y th
e p
roje
ct's
plu
mb
ing
des
ign
en
gin
eer.
10.
Do
no
t in
stal
l wit
h ir
on
pip
ing
. U
se o
nly
new
pip
ing
th
at is
su
itab
le fo
r p
ota
ble
(dri
nki
ng
)w
ater
. D
o n
ot
use
pip
ing
th
at h
as b
een
tre
ated
wit
h c
hro
mat
es, b
oile
r se
al o
r o
ther
ch
emic
als.
Wat
er C
on
nec
tio
ns:
H C T
HR
TR B
BR
=
Ho
t Wat
er O
utl
et
=
Co
ld W
ater
Inle
t
=
Tem
per
ed W
ater
Ou
tlet
=
Ho
t Wat
er R
ecir
cula
tin
g L
ine
=
Tem
per
ed W
ater
Rec
ircu
lati
ng
Lin
e
=
Hig
h T
emp
erat
ure
Bo
ost
er H
eate
r O
utl
et
=
Hig
h T
emp
erat
ure
Bo
ost
er W
ater
R
ecir
cula
tin
g L
ine
Ret
urn
4C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Plu
mb
ing
Co
mp
on
ent
Des
crip
tio
ns
An
ti-s
iph
on
Val
ve -
Saf
ety
valv
e th
at p
reve
nts
wat
er fr
om
si
ph
on
ing
bac
k in
to t
he
po
tab
le w
ater
su
pp
ly.
Ch
eck
Val
ve -
A d
evic
e th
at p
erm
its
wat
er t
o fl
ow
in o
nly
on
e d
irec
tio
n.
Cir
cula
tin
g P
um
p -
An
all-
bro
nze
pu
mp
th
at c
ircu
late
s p
ota
ble
w
ater
th
rou
gh
th
e w
ater
hea
tin
g s
yste
m.
A t
her
mo
stat
sw
itch
es
the
pu
mp
on
wh
en w
ater
dro
ps
bel
ow
a s
et t
emp
erat
ure
in t
he
sto
rag
e ta
nk
or
circ
ula
tin
g li
ne.
Pu
mp
s ca
n b
e u
sed
to
kee
p
wat
er in
a s
tora
ge
tan
k at
a d
esir
ed t
emp
erat
ure
, or
to c
ircu
late
h
ot
wat
er t
hro
ug
h p
ipin
g, m
akin
g h
ot
wat
er im
med
iate
ly
avai
lab
le a
t ev
ery
fixt
ure
.
Exp
ansi
on
Tan
k -
A t
ank
inst
alle
d o
n t
he
inco
min
g w
ater
lin
e th
at a
bso
rbs
exp
and
ing
wat
er a
nd
pre
ven
ts p
ress
ure
bu
ildu
p
insi
de
the
wat
er h
eate
r ta
nk.
Exp
ansi
on
tan
ks a
re n
eces
sary
in
clo
sed
wat
er s
yste
ms.
A c
lose
d w
ater
sys
tem
is u
sual
ly c
ause
d
by
a b
ackf
low
pre
ven
tio
n d
evic
e, s
uch
as
a ch
eck
valv
e o
r w
ater
m
eter
, th
at p
reve
nts
hea
ted
wat
er fr
om
exp
and
ing
into
th
e co
ld
wat
er s
up
ply
lin
e.
Lin
e T
em
pe
ratu
re C
on
tro
l - T
her
mo
stat
th
at c
on
tro
ls a
ci
rcu
lati
ng
pu
mp
inst
alle
d in
th
e h
ot
wat
er c
ircu
lati
ng
loo
p
(pip
ing
), as
suri
ng
th
at t
he
wat
er d
eliv
ered
is t
he
des
ired
te
mp
erat
ure
.
Mix
ing
Val
ve -
(Tem
per
ing
Val
ve) D
evic
e th
at m
ixes
co
ld w
ater
w
ith
ho
t w
ater
to
a d
esir
ed t
emp
erat
ure
for
a p
arti
cula
r ap
plic
atio
n.
For
exam
ple
, so
me
nu
rsin
g h
om
es r
equ
ire
a m
axim
um
wat
er t
emp
erat
ure
of
10
5°F
at
sho
wer
s an
d o
ther
d
om
esti
c w
ater
fixt
ure
s. In
co
mm
erci
al k
itch
ens,
po
t si
nks
may
re
qu
ire
140°
F w
ater
. M
ixin
g v
alve
s ca
n b
e in
stal
led
to
insu
re
the
pro
per
tem
per
atu
re fo
r ea
ch a
pp
licat
ion
.
Plu
g C
ock
- V
alve
th
at is
man
ual
ly a
dju
sted
to
reg
ula
te w
ater
flo
w
thro
ug
h c
ircu
lati
ng
lin
es a
nd
bal
ance
wat
er f
low
th
rou
gh
mu
ltip
le
hea
ters
th
at a
re m
anifo
lded
to
get
her
. B
alan
cin
g t
he
flo
w a
ssu
res
that
al
l sys
tem
co
mp
on
ents
are
do
ing
an
eq
ual
am
ou
nt
of w
ork
an
d t
hat
ex
cess
ive
wat
er v
elo
citi
es a
re a
void
ed in
th
e sy
stem
's p
ipin
g.
Pre
ssu
re R
edu
cin
g V
alve
- Va
lve
that
co
ntr
ols
su
pp
lied
wat
er p
ress
ure
, p
reve
nti
ng
dam
age
to p
lum
bin
g s
yste
ms
that
can
be
cau
sed
by
exce
ssiv
e p
ress
ure
.
Sh
uto
ff V
alv
e -
Val
ve t
hat
sto
ps
the
flo
w o
f wat
er, a
llow
ing
a s
yste
m
com
po
nen
t to
be
iso
late
d fo
r re
pai
r o
r se
rvic
e w
ith
ou
t sh
utt
ing
do
wn
th
e en
tire
sys
tem
.
Th
erm
om
eter
- Te
mp
erat
ure
mea
suri
ng
dev
ice
inst
alle
d in
or
nea
r th
e h
ot
wat
er o
utl
et o
n a
wat
er h
eate
r o
r st
ora
ge
tan
k to
ver
ify
that
th
e fl
ow
bet
wee
n s
yste
m c
om
po
nen
ts is
bal
ance
d.
Ther
mo
met
ers
are
use
d t
o in
dic
ate
faile
d w
ater
hea
ters
, im
pro
per
ly o
per
atin
g s
tora
ge
tan
ks, a
nd
to
ver
ify
that
all
man
ifo
lded
wat
er h
eate
rs a
re d
oin
g a
n
equ
al a
mo
un
t o
f w
ork
. If
th
e o
utg
oin
g w
ater
tem
per
atu
res
are
the
sam
e an
d r
ise
and
fall
at t
he
sam
e ra
te, h
ot
wat
er fl
ow
is b
alan
ced
. If
o
utg
oin
g t
emp
erat
ure
s ar
e d
iffe
ren
t, o
r if
th
ey r
ise
and
fall
at d
iffe
ren
t ra
tes,
th
e p
lug
co
ck c
an b
e u
sed
to
reg
ula
te fl
ow
th
rou
gh
eac
h w
ater
h
eate
r o
r st
ora
ge
tan
k u
nti
l th
e sy
stem
is in
bal
ance
.
Un
ion
- T
hre
e-p
iece
fitt
ing
use
d fo
r jo
inin
g s
ecti
on
s o
f pip
e. U
nio
ns
per
mit
co
mp
on
ents
to b
e d
isco
nn
ecte
d e
asily
for r
epai
r or r
epla
cem
ent.
Wat
er H
amm
er A
rres
ter
- Air
cyl
ind
er in
stal
led
nea
r a
fixtu
re t
o a
bso
rb
the
sho
ck w
ave
cau
sed
wh
en t
hat
fixt
ure
clo
ses
qu
ickl
y, r
esu
ltin
g in
a
reve
rse
surg
e in
wat
er p
ress
ure
in t
he
pip
ing
du
e to
ab
rup
tly
sto
pp
ing
th
e fl
ow
of h
igh
vel
oci
ty w
ater
. W
ater
ham
mer
is n
oti
ceab
le a
s a
lou
d
ban
gin
g n
ois
e in
th
e p
ipes
an
d c
an c
ause
dam
age
to t
he
plu
mb
ing
sy
stem
.
5C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
34
an
d 5
0-G
allo
n P
ola
ris®
Wat
er H
eate
rC
om
mer
cial
Inst
alla
tio
n D
iag
ram
s
6
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
19-
20. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
Sin
gle
Po
lari
s® W
ater
Hea
ter
Inst
alla
tio
nO
ne
or T
wo
Tem
per
atu
reW
ith
or W
ith
ou
t Re
circ
ula
tio
n
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
HR
TR
T
Mix
ing
Val
ve
H
For r
ecirc
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
7
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
19-
20. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
Two
Po
lari
s® W
ater
Hea
ter
Inst
alla
tio
nO
ne
or T
wo
Tem
per
atu
reW
ith
or W
ith
ou
t Re
circ
ula
tio
n
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
HR
TR
T
Mix
ing
Val
ve
H
8
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
19-
20. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
Thre
e P
ola
ris®
Wat
er H
eate
r In
stal
lati
on
On
e o
r Tw
o T
emp
erat
ure
Wit
h o
r Wit
ho
ut
Reci
rcu
lati
on
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
HR
TR
T
Mix
ing
Val
ve
H
9
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
19-
20. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
Fou
r P
ola
ris®
Wat
er H
eate
r In
stal
lati
on
On
e o
r Tw
o T
emp
erat
ure
Wit
h o
r Wit
ho
ut
Reci
rcu
lati
on
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
HR
TR
T
Mix
ing
Val
ve
H
10C
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ight
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mer
ican
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ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Sin
gle
Po
lari
s® W
ater
Hea
ter
wit
h S
tora
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Tan
kO
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or T
wo
Tem
per
atu
reW
ith
or W
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Tan
kTe
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Co
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(170
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STO
RA
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TAN
K
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
TR
T
Mix
ing
Val
ve
HR
H
C
L112
0V
AC
L2N
eutr
al
Tan
k Te
mp
erat
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Co
ntr
ol Cir
cula
tin
gP
um
p
Wir
ing
Dia
gra
m
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
21-
22. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
11C
opyr
ight
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mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Two
Po
lari
s® W
ater
Hea
ters
wit
h S
tora
ge
Tan
kO
ne
or T
wo
Tem
per
atu
reW
ith
or W
ith
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circ
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n
Tan
kTe
mp
erat
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Co
ntr
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(170
°F M
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STO
RA
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TAN
K
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
TR
T
Mix
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Val
ve
HR
H
C
L112
0V
AC
L2N
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al
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k Te
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Co
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gP
um
p
Wir
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Dia
gra
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Sym
bol
lege
nd a
nd in
stal
lati
on n
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age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
21-
22. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
12C
opyr
ight
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mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Sin
gle
Po
lari
s® W
ater
Hea
ter
wit
h T
wo
Sto
rag
e Ta
nks
On
e o
r Tw
o T
emp
erat
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Wit
h o
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ho
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Reci
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lati
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Tan
kTe
mp
erat
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Co
ntr
ol
(170
°F M
ax)
STO
RA
GE
TAN
K
STO
RA
GE
TAN
K
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
TR
T
Mix
ing
Val
ve
H
C
HR
L112
0V
AC
L2N
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al
Tan
k Te
mp
erat
ure
Co
ntr
ol Cir
cula
tin
gP
um
p
Wir
ing
Dia
gra
m
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
21-
22. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
13C
opyr
ight
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mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter
wit
h D
ish
was
her
On
e o
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erat
ure
Wit
h o
r Wit
ho
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Reci
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on
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
TR
T
Mix
ing
Val
ve
Tog
gle
Swit
ch
Fin
al R
inse
Ther
mo
met
er
Pre
ssu
reR
edu
cin
gV
alve
San
itiz
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Lin
eTh
erm
om
eter
DIS
HW
ASH
ER
L112
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AC
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Co
ntr
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Cir
cula
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gP
um
p
Wir
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Dia
gra
mTo
gg
leSw
itch
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
27-
28. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
14C
opyr
ight
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mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter
wit
h B
oo
ster
Hea
ter
Two
Tem
per
atu
reW
ith
or W
ith
ou
t Re
circ
ula
tio
n
C
HR
PR
IMA
RY
HEA
TER
BO
OST
ERH
EATE
R
HB
BR
Hig
hTe
mp
erat
ure
Exp
ansi
on
Tan
k
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
23-
24. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
15C
opyr
ight
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mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Two
Po
lari
s® W
ater
Hea
ters
wit
h B
oo
ster
Hea
ter
Two
Tem
per
atu
reW
ith
or W
ith
ou
t Re
circ
ula
tio
n
BO
OST
ERH
EATE
R
PR
IMA
RY
HEA
TER
PR
IMA
RY
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TER
B
BR
Hig
hTe
mp
erat
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Exp
ansi
on
Tan
k
C
HR
H
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
23-
24. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
16C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter
wit
h S
tora
ge
Tan
k an
d B
oo
ster
Hea
ter
Two
or T
hre
e Te
mp
erat
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Wit
h o
r Wit
ho
ut
Reci
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lati
on
PR
IMA
RY
HEA
TER
BO
OST
ERH
EATE
R
Tan
kTe
mp
erat
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Co
ntr
ol
(170
°F M
ax)
STO
RA
GE
TAN
K
Hig
hTe
mp
erat
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Exp
ansi
on
Tan
kO
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on
alTw
o T
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erat
ure
Inst
alla
tio
n
TR
T
Mix
ing
Val
ve
HR
H
C
BR
B
L112
0V
AC
L2N
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al
Tan
k Te
mp
erat
ure
Co
ntr
ol Cir
cula
tin
gP
um
p
Wir
ing
Dia
gra
m
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4. F
or s
eque
nce
of o
per
atio
n se
e p
ages
25-
26. F
or re
circ
ulat
ion
loop
info
rmat
ion
see
pag
e 18
.
17C
opyr
ight
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mer
ican
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ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Co
mb
ined
Ap
plia
nce
Ap
plic
atio
nO
ne
Tem
per
atu
reW
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ou
t Re
circ
ula
tio
n
Sym
bol
lege
nd a
nd in
stal
lati
on n
otes
- p
age
3. C
omp
onen
t des
crip
tion
s - p
age
4.
Op
tio
nal
Two
Tem
per
atu
reIn
stal
lati
on
C
TRT
Mix
ing
Val
ve
Exp
ansi
on
Ta
nk
Pre
ssu
reR
edu
cin
gV
alve
Inle
tO
utl
et
AIR
HA
ND
LER
18C
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© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Rec
ircu
lati
on
Lo
op
s
L112
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Co
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Cir
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p
Wir
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gra
m
Fro
m H
To H
R
To F
ixtu
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Lin
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erat
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C
on
tro
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lati
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P
um
p
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n L
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p
Fro
m H
To H
R
To F
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Lin
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mp
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C
on
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lC
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lati
ng
P
um
p
Tem
per
ed W
ater
Rec
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lati
on
Lo
op
Fro
m H
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R
To F
ixtu
res
Lin
e Te
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erat
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C
on
tro
lC
ircu
lati
ng
P
um
p
Bo
ost
ed W
ater
Rec
ircu
lati
on
Lo
op
19
Mu
ltip
le P
ola
ris®
Wat
er H
eate
r In
stal
lati
on
Seq
uen
ce o
f Op
erat
ion
s
Cop
yrig
ht ©
Am
eric
an®
Wat
er H
eate
rs 2
010.
All
righ
ts re
serv
ed.
C
HR
TR
T
Mix
ing
Val
ve
H
1
A
2
3
4
B
C
D
1
4
A
A
B
B
B
C
CC
20C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
14
32
Ho
t an
d te
mp
ered
wat
er o
utl
ets
can
be
pro
vid
ed
wit
h o
r wit
ho
ut
a re
circ
ula
tin
g li
ne.
Wh
en lo
ng
run
s o
f pip
e ar
e re
qu
ired
bet
wee
n t
he
wat
er h
eate
r(s)
an
d t
he
fixtu
res,
reci
rcu
lati
ng
lin
es a
re u
sed
to
elim
inat
e w
aste
d w
ater
an
d t
ime
del
ays
wh
ile t
he
use
r is
wai
tin
g fo
r usa
ble
ho
t w
ater
at
each
fixt
ure
. Re
circ
ula
tin
g li
nes
feed
ho
t o
r tem
per
ed w
ater
to
fixtu
res
and
retu
rn u
nu
sed
wat
er b
ack
fro
m t
he
furt
hes
t fix
ture
to t
he
wat
er h
eate
r(s)
for r
ehea
tin
g.
Wat
er fl
ow
th
rou
gh
reci
rcu
lati
ng
lin
es is
co
ntr
olle
d
by
a lin
e te
mp
erat
ure
co
ntr
ol (
ther
mo
stat
) th
at
op
erat
es a
bro
nze
cir
cula
tin
g p
um
p. W
hen
wat
er
tem
per
atu
re in
th
e re
circ
ula
tin
g li
ne
dro
ps
bel
ow
th
e lin
e te
mp
erat
ure
co
ntr
ol’s
set
po
int,
the
con
tro
l tu
rns
on
th
e p
um
p c
ausi
ng
ho
t o
r tem
per
ed w
ater
to
cir
cula
te t
hro
ug
h t
he
line.
Flo
w ra
te in
th
e ci
rcu
lati
ng
lin
e is
ad
just
ed u
sin
g a
flo
w re
gu
lati
ng
p
lug
co
ck.
C
heck
val
ves
inst
alle
d on
the
lines
insu
re th
at
wat
er fl
ows
in o
ne d
irect
ion
only
, pre
vent
ing
ba
ckflo
w a
nd u
nexp
ecte
d m
ixin
g of
hot
and
co
ld w
ater
. Som
e ch
eck
valv
es c
an o
nly
be
in
stal
led
horiz
onta
lly. R
efer
to th
e ch
eck
valv
e
m
anuf
actu
rer’s
inst
alla
tion
inst
ruct
ions
.
A
ll w
ater
hea
ters
sho
uld
be in
stal
led
with
shut
off v
alve
s an
d un
ions
in c
old
wat
er in
let
an
d ho
t wat
er o
utle
t lin
es to
allo
w is
olat
ion
an
d re
plac
emen
t of f
aile
d he
ater
s w
ithou
t
co
mpl
etel
y sh
uttin
g of
f th
e w
ater
sup
ply.
Whe
n
m
ultip
le u
nits
are
inst
alle
d, fu
nctio
ning
uni
ts c
an
re
mai
n in
ser
vice
whi
le th
e fa
iled
unit
is re
pai
red
or re
pla
ced.
A
shu
toff
val
ve o
n th
e in
com
ing
cold
wat
er
su
pply
line
allo
ws
the
syst
em to
be
shut
dow
n in
the
even
t of a
n em
erge
ncy,
or w
hen
nece
ssar
y
fo
r ser
vice
.
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s, co
ld w
ater
en
ters
ea
ch w
ater
hea
ter n
ear t
he
bo
tto
m, l
ow
erin
g t
he
wat
er te
mp
erat
ure
bel
ow
th
e th
erm
ost
at’s
set
po
int.
Th
e th
erm
ost
at a
ctiv
ates
th
e g
as b
urn
er. T
he
bu
rner
co
nti
nu
es h
eati
ng
wat
er u
nti
l th
e te
mp
erat
ure
of t
he
wat
er a
t th
e th
erm
ost
at re
ach
es t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
sh
uts
do
wn
th
e b
urn
er. T
he
hea
tin
g c
ycle
rep
eats
itse
lf as
oft
en a
s re
qu
ired
.
Wh
en m
ult
iple
wat
er h
eate
rs a
re m
anifo
lded
tog
eth
er,
reve
rse
retu
rn o
r eq
ual
ly y
oke
d p
ipin
g in
sure
s th
at
wat
er is
dra
wn
fro
m, a
nd
en
ters
into
, eac
h o
f th
e w
ater
h
eate
rs a
t an
eq
ual
(bal
ance
d) fl
ow
rate
. Th
is e
nsu
res
that
eac
h w
ater
hea
ter p
erfo
rms
the
sam
e am
ou
nt
of
wo
rk d
uri
ng
hea
tin
g c
ycle
s, p
rovi
des
th
e m
axim
um
am
ou
nt
of h
ot
wat
er a
vaila
ble
fro
m e
ach
wat
er
hea
ter’s
sto
rag
e ta
nk,
an
d h
as a
pp
roxi
mat
ely
the
sam
e lif
e sp
an.
Reve
rse
retu
rn p
ipin
g is
sh
ow
n.
All
wat
er
hea
ters
mu
st b
e ex
actl
y th
e sa
me.
Th
erm
om
eter
s o
n h
ot
wat
er o
utl
et li
nes
ind
icat
e
ap
pro
xim
atel
y th
e sa
me
tem
per
atu
re a
t al
l tim
es
if
the
syst
em is
bal
ance
d a
nd
pro
vid
es a
mea
ns
to v
erify
th
at t
he
wat
er p
rovi
ded
is a
t th
e co
rrec
t
te
mp
erat
ure
for t
he
app
licat
ion
.
In t
wo
tem
per
atu
re s
yste
ms,
the
mix
ing
(tem
per
ing
) va
lve
com
bin
es c
old
wat
er fr
om
th
e co
ld w
ater
su
pp
ly
line
wit
h h
ot
wat
er fr
om
th
e p
rim
ary
ho
t w
ater
ou
tlet
to
pro
vid
e a
seco
nd
ho
t w
ater
ou
tlet
tem
per
atu
re
acco
rdin
g to
th
e m
ixin
g v
alve
’s se
ttin
g. T
he
mix
ing
va
lve
sho
uld
be
set
for t
he
des
ired
tem
per
atu
re
acco
rdin
g to
th
e ap
plic
atio
n’s
ho
t w
ater
req
uir
emen
t.
For e
xam
ple
, nu
rsin
g h
om
es m
ay re
qu
ire
a m
axim
um
w
ater
tem
per
atu
re o
f 105
°F a
t sh
ow
ers
and
oth
er
do
mes
tic
wat
er fi
xtu
res.
In c
om
mer
cial
kit
chen
s, p
ot
sin
ks m
ay re
qu
ire
140°
F w
ater
.
21C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter(
s) w
ith
Sto
rag
e Ta
nk(
s)Se
qu
ence
of O
per
atio
ns
Tan
kTe
mp
erat
ure
Co
ntr
ol
(170
°F M
ax)
STO
RA
GE
TAN
K
STO
RA
GE
TAN
K
TR
T
Mix
ing
Val
ve
H
C
HR
1
4
3
5
2
B6 C
D
E
A
6
B
B
B
C
C
CC
D
D
DD
D
22C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
th
e m
ixin
g o
f ho
tter
an
d c
oo
ler w
ater
. So
me
ch
eck
valv
es c
an o
nly
be
inst
alle
d h
ori
zon
tally
.
Refe
r to
th
e ch
eck
valv
e m
anu
fact
ure
r’s
in
stal
lati
on
inst
ruct
ion
s.
Ea
ch w
ater
hea
ter a
nd
sto
rag
e ta
nk
sho
uld
be
in
stal
led
wit
h s
hu
toff
val
ves
and
un
ion
s in
co
ld
w
ater
inle
t an
d h
ot
wat
er o
utl
et li
nes
to a
llow
is
ola
tio
n a
nd
rep
lace
men
t o
f fai
led
hea
ters
wit
ho
ut
shu
ttin
g o
ff t
he
wat
er s
up
ply
. Wh
en
mu
ltip
le w
ater
hea
ters
an
d s
tora
ge
tan
ks a
re
inst
alle
d, fu
nct
ion
ing
un
its
can
rem
ain
in s
ervi
ce
w
hile
th
e fa
iled
un
it is
rep
lace
d.
A
sh
uto
ff v
alve
on
th
e in
com
ing
co
ld w
ater
sup
ply
lin
e al
low
s th
e sy
stem
to b
e sh
ut
do
wn
in
the
even
t o
f an
em
erg
ency
, or w
hen
nec
essa
ry
for s
ervi
ce.
cycl
es, p
rovi
des
th
e m
axim
um
am
ou
nt
of h
ot
wat
er
avai
lab
le fr
om
sto
red
wat
er, a
nd
has
ap
pro
xim
atel
y th
e sa
me
life
span
. Re
vers
e re
turn
pip
ing
is s
ho
wn
. A
ll w
ater
hea
ters
man
ifold
ed to
get
her
, or s
tora
ge
tan
ks
man
ifold
ed to
get
her
, mu
st b
e ex
actl
y th
e sa
me.
Th
erm
om
eter
s o
n h
ot
wat
er o
utl
et li
nes
ind
icat
e
ap
pro
xim
atel
y th
e sa
me
tem
per
atu
re a
t al
l tim
es
if
the
syst
em is
bal
ance
d a
nd
pro
vid
es a
mea
ns
to v
erify
th
at t
he
wat
er p
rovi
ded
is a
t th
e co
rrec
t
tem
per
atu
re fo
r th
e ap
plic
atio
n.
In t
wo
tem
per
atu
re s
yste
ms,
the
mix
ing
/tem
per
ing
va
lve
com
bin
es c
old
wat
er fr
om
th
e co
ld w
ater
su
pp
ly
line
wit
h h
ot
wat
er fr
om
th
e sy
stem
’s p
rim
ary
ho
t w
ater
ou
tlet
to p
rovi
de
a se
con
d h
ot
wat
er o
utl
et
tem
per
atu
re a
cco
rdin
g to
th
e m
ixin
g v
alve
’s se
ttin
g.
The
mix
ing
val
ve s
ho
uld
be
set
for t
he
des
ired
te
mp
erat
ure
acc
ord
ing
to t
he
app
licat
ion’
s h
ot
wat
er
req
uir
emen
t. F
or e
xam
ple
, nu
rsin
g h
om
es m
ay re
qu
ire
a m
axim
um
wat
er te
mp
erat
ure
of 1
05°F
at
sho
wer
s an
d o
ther
do
mes
tic
wat
er fi
xtu
res.
In c
om
mer
cial
ki
tch
ens,
po
t si
nks
may
req
uir
e 14
0°F
wat
er.
Ho
t an
d te
mp
ered
wat
er o
utl
ets
can
be
pro
vid
ed
wit
h o
r wit
ho
ut
a re
circ
ula
tin
g li
ne.
Wh
en lo
ng
run
s o
f pip
e ar
e re
qu
ired
bet
wee
n t
he
wat
er h
eate
r(s)
an
d
the
fixtu
res,
reci
rcu
lati
ng
lin
es a
re u
sed
to e
limin
ate
was
ted
wat
er a
nd
tim
e d
elay
s w
hile
th
e u
ser i
s w
aiti
ng
fo
r usa
ble
ho
t w
ater
at
each
fixt
ure
. Re
circ
ula
tin
g li
nes
fe
ed h
ot
or t
emp
ered
wat
er to
fixt
ure
s an
d re
turn
u
nu
sed
wat
er b
ack
fro
m t
he
furt
hes
t fix
ture
to t
he
wat
er h
eate
r(s)
for r
ehea
tin
g. W
ater
flo
w t
hro
ug
h
reci
rcu
lati
ng
lin
es is
co
ntr
olle
d b
y a
line
tem
per
atu
re
con
tro
l (th
erm
ost
at) t
hat
op
erat
es a
bro
nze
cir
cula
tin
g
pu
mp
. Wh
en w
ater
tem
per
atu
re in
th
e re
circ
ula
tin
g
line
dro
ps
bel
ow
th
e lin
e te
mp
erat
ure
co
ntr
ol’s
set
p
oin
t, th
e co
ntr
ol t
urn
s o
n t
he
pu
mp
cau
sin
g h
ot
or
tem
per
ed w
ater
to c
ircu
late
th
rou
gh
th
e lin
e. F
low
ra
te in
th
e ci
rcu
lati
ng
lin
e is
ad
just
ed u
sin
g a
flo
w
reg
ula
tin
g p
lug
co
ck.
C
hec
k va
lves
inst
alle
d o
n t
he
lines
insu
re t
hat
w
ater
flo
ws
in o
ne
dir
ecti
on
on
ly. T
his
pre
ven
ts
1
65
432
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s, co
ld w
ater
en
ters
ea
ch w
ater
hea
ter n
ear t
he
bo
tto
m, l
ow
erin
g t
he
wat
er te
mp
erat
ure
bel
ow
th
e th
erm
ost
at’s
set
po
int.
Th
e th
erm
ost
at a
ctiv
ates
th
e g
as b
urn
er. T
he
bu
rner
co
nti
nu
es h
eati
ng
wat
er u
nti
l th
e te
mp
erat
ure
of t
he
wat
er a
t th
e th
erm
ost
at re
ach
es t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
sh
uts
do
wn
th
e b
urn
er. T
he
hea
tin
g c
ycle
rep
eats
itse
lf as
oft
en a
s re
qu
ired
.
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s, h
ot
wat
er is
d
raw
n in
eq
ual
am
ou
nts
fro
m e
ach
wat
er h
eate
r in
to
the
bo
tto
m o
f eac
h s
tora
ge
tan
k. W
hen
th
e w
ater
te
mp
erat
ure
in t
he
sto
rag
e ta
nk
dro
ps
bel
ow
th
e ta
nk
tem
per
atu
re c
on
tro
l’s s
et p
oin
t, th
e ci
rcu
lati
ng
pu
mp
is
act
ivat
ed. T
he
sto
rag
e ta
nk’
s te
mp
erat
ure
co
ntr
ol
set
po
int
sho
uld
be
5-10
°F lo
wer
th
an t
he
wat
er
hea
ter’s
th
erm
ost
at s
etti
ng.
The
circ
ula
tin
g p
um
p d
raw
s co
ol w
ater
fro
m t
he
bo
tto
m o
f eac
h s
tora
ge
tan
k re
turn
ing
it to
th
e co
ld
wat
er in
let
on
eac
h w
ater
hea
ter f
or r
ehea
tin
g. A
s co
ol
wat
er is
dra
wn
fro
m e
ach
sto
rag
e ta
nk
it is
rep
lace
d
by
ho
t w
ater
fro
m t
he
wat
er h
eate
r. H
eate
d w
ater
en
ters
th
e st
ora
ge
tan
k b
elo
w t
he
tan
k te
mp
erat
ure
co
ntr
ol.
Hea
ted
wat
er ri
ses
in t
he
sto
rag
e ta
nk
forc
ing
co
ol w
ater
to t
he
bo
tto
m o
f th
e ta
nk
wh
ere
it is
dra
wn
o
ut
by
the
circ
ula
tin
g p
um
p. W
hen
th
e te
mp
erat
ure
co
ntr
ol o
n t
he
sto
rag
e ta
nk
is s
atis
fied,
it s
hu
ts d
ow
n
the
circ
ula
tin
g p
um
p. T
he
wat
er h
eate
r co
nti
nu
es
hea
tin
g u
nti
l its
th
erm
ost
at is
sat
isfie
d.
Th
e p
lug
co
ck is
use
d to
ad
just
th
e flo
w o
f
wat
er to
3-5
gal
lon
s p
er m
inu
te, w
hic
h re
du
ces
co
nd
ensa
tio
n a
nd
incr
ease
s th
e am
ou
nt
of h
ot
w
ater
ava
ilab
le b
y lim
itin
g t
urb
ule
nce
in t
he
ta
nk.
Wh
en m
ult
iple
wat
er h
eate
rs a
nd
mu
ltip
le s
tora
ge
tan
ks a
re m
anifo
lded
tog
eth
er, r
ever
se re
turn
or
equ
ally
yo
ked
pip
ing
insu
res
that
wat
er is
dra
wn
fr
om
an
d e
nte
rs in
to e
ach
of t
he
wat
er h
eate
rs a
nd
st
ora
ge
tan
ks a
t an
eq
ual
(bal
ance
d) fl
ow
rate
. Th
is
insu
res
that
eac
h w
ater
hea
ter a
nd
sto
rag
e ta
nk
per
form
s th
e sa
me
amo
un
t o
f wo
rk d
uri
ng
hea
tin
g
23C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter(
s) w
ith
Bo
ost
er H
eate
r(s)
Seq
uen
ce o
f Op
erat
ion
s
BO
OST
ERH
EATE
R
PR
IMA
RY
HEA
TER
PR
IMA
RY
HEA
TER
B
BR
Hig
hTe
mp
erat
ure
Exp
ansi
on
Tan
k
C
HR
H
B
2
C
1
A
4
E
D
F
3
1
4
A
A
D
E
EE
E
E
24C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Re
fer t
o t
he
chec
k va
lve
man
ufa
ctu
rer’s
in
stal
lati
on
inst
ruct
ion
s.
Ea
ch p
rim
ary
wat
er h
eate
r an
d b
oo
ster
hea
ter
sh
ou
ld b
e in
stal
led
wit
h s
hu
toff
val
ves
and
u
nio
ns
in w
ater
inle
t an
d o
utl
et li
nes
to a
llow
is
ola
tio
n a
nd
rep
lace
men
t o
f fai
led
hea
ters
w
ith
ou
t sh
utt
ing
off
th
e w
ater
su
pp
ly. W
hen
m
ult
iple
pri
mar
y w
ater
hea
ters
an
d/o
r bo
ost
er
hea
ters
are
inst
alle
d, fu
nct
ion
ing
un
its
can
re
mai
n in
ser
vice
wh
ile t
he
faile
d u
nit
is re
pai
red
o
r rep
lace
d.
A
sh
uto
ff v
alve
on
th
e in
com
ing
co
ld w
ater
su
pp
ly li
ne
allo
ws
the
syst
em to
be
shu
t d
ow
n in
th
e ev
ent
of a
n e
mer
gen
cy, o
r wh
en n
eces
sary
fo
r ser
vice
.
te
mp
erat
ure
bo
ost
er h
eate
r wat
er fr
om
reac
hin
g
fixtu
res
no
t co
nn
ecte
d to
th
e b
oo
ster
hea
ter’s
h
ot
wat
er o
utl
et.
Som
e ch
eck
valv
es c
an o
nly
b
e in
stal
led
ho
rizo
nta
lly.
Refe
r to
th
e ch
eck
valv
e
man
ufa
ctu
rer’s
inst
alla
tio
n in
stru
ctio
ns.
W
ater
exp
and
s as
it is
hea
ted
an
d c
ann
ot
be
co
mp
ress
ed.
A c
hec
k va
lve
in t
he
bo
ost
er
hea
ter’s
su
pp
ly c
reat
es a
clo
sed
sys
tem
,
pre
ven
tin
g t
he
wat
er fr
om
exp
and
ing
bac
k
thro
ug
h t
he
line.
An
exp
ansi
on
tan
k is
req
uir
ed
to a
bso
rb t
he
exp
and
ing
wat
er, p
reve
nti
ng
p
ress
ure
bu
ildu
p in
sid
e th
e b
oo
ster
hea
ter o
r
wat
er li
nes
.
Ho
t w
ater
fro
m p
rim
ary
wat
er h
eate
rs a
nd
/or b
oo
ster
h
eate
rs c
an b
e p
rovi
ded
wit
h o
r wit
ho
ut
reci
rcu
lati
ng
lin
es. W
hen
ava
ilab
ility
of h
ot
wat
er is
imm
edia
tely
re
qu
ired
for t
he
app
licat
ion
an
d/o
r wh
en lo
ng
run
s o
f pip
e ar
e re
qu
ired
bet
wee
n t
he
bo
ost
er w
ater
h
eate
r(s)
an
d/o
r th
e p
rim
ary
wat
er h
eate
r(s)
an
d t
he
fixtu
res,
reci
rcu
lati
ng
lin
es c
an b
e u
sed
to e
limin
ate
was
ted
wat
er a
nd
tim
e d
elay
s. R
ecir
cula
tin
g li
nes
fe
ed h
ot
wat
er fr
om
th
e b
oo
ster
hea
ter o
r ho
t w
ater
fr
om
th
e p
rim
ary
wat
er h
eate
r to
fixt
ure
s an
d re
turn
u
nu
sed
wat
er fr
om
th
e fu
rth
est
fixtu
re to
th
e w
ater
h
eate
r(s)
for r
ehea
tin
g. W
ater
flo
w t
hro
ug
h e
ach
re
circ
ula
tin
g li
ne
is c
on
tro
lled
by
a lin
e te
mp
erat
ure
co
ntr
ol (
ther
mo
stat
) th
at o
per
ates
a b
ron
ze c
ircu
lati
ng
p
um
p. W
hen
wat
er te
mp
erat
ure
in t
he
reci
rcu
lati
ng
lin
e d
rop
s b
elo
w t
he
line
tem
per
atu
re c
on
tro
l’s s
et
po
int,
the
con
tro
l tu
rns
on
th
e p
um
p c
ausi
ng
ho
t o
r te
mp
ered
wat
er to
cir
cula
te t
hro
ug
h t
he
line.
Flo
w
rate
in t
he
circ
ula
tin
g li
ne
is a
dju
sted
usi
ng
a fl
ow
re
gu
lati
ng
plu
g c
ock
. H
ot
wat
er fr
om
eac
h b
oo
ster
h
eate
r’s re
circ
ula
tin
g li
ne
is re
turn
ed to
th
e b
oo
ster
h
eate
r’s in
let.
Ho
t w
ater
fro
m e
ach
pri
mar
y w
ater
h
eate
r’s re
circ
ula
tin
g li
ne
is re
turn
ed to
th
e p
rim
ary
hea
ter’s
inle
t.
C
hec
k va
lves
inst
alle
d o
n t
he
lines
insu
re t
hat
w
ater
flo
ws
in o
ne
dir
ecti
on
on
ly. T
his
pre
ven
ts
the
mix
ing
of h
ott
er a
nd
co
ole
r wat
er.
Som
e
chec
k va
lves
can
on
ly b
e in
stal
led
ho
rizo
nta
lly.
1
4
32
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s, co
ld w
ater
en
ters
ea
ch p
rim
ary
wat
er h
eate
r nea
r th
e b
ott
om
, lo
wer
ing
th
e w
ater
tem
per
atu
re b
elo
w t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
act
ivat
es t
he
gas
bu
rner
. Th
e b
urn
er c
on
tin
ues
hea
tin
g w
ater
un
til t
he
tem
per
atu
re
of t
he
wat
er a
t th
e th
erm
ost
at re
ach
es t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
sh
uts
do
wn
th
e g
as b
urn
er. T
he
hea
tin
g c
ycle
rep
eats
itse
lf as
oft
en a
s re
qu
ired
.
Th
erm
om
eter
s o
n h
ot
wat
er o
utl
et li
nes
ind
icat
e
ap
pro
xim
atel
y th
e sa
me
tem
per
atu
re a
t al
l tim
es
if
the
syst
em is
bal
ance
d a
nd
pro
vid
es a
mea
ns
to v
erify
th
at t
he
wat
er p
rovi
ded
is t
he
corr
ect
te
mp
erat
ure
for t
he
app
licat
ion
.
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s se
rved
by
each
b
oo
ster
hea
ter’s
ho
t w
ater
ou
tlet
, ho
t w
ater
fro
m
pri
mar
y w
ater
hea
ters
is d
raw
n in
to t
he
bo
tto
m o
f ea
ch b
oo
ster
hea
ter.
Wh
en t
he
wat
er te
mp
erat
ure
in
th
e b
oo
ster
hea
ter’s
tan
k d
rop
s b
elo
w t
he
ther
mo
stat
’s se
t p
oin
t, th
e b
oo
ster
hea
ter’s
gas
bu
rner
is
en
erg
ized
. Th
e b
urn
er s
tays
on
un
til t
he
wat
er
tem
per
atu
re in
th
e b
oo
ster
hea
ter r
each
es t
he
set
po
int
of t
he
bo
ost
er h
eate
r’s t
her
mo
stat
. Th
is c
ycle
re
pea
ts it
self
as o
ften
as
req
uir
ed.
Wh
en m
ult
iple
pri
mar
y w
ater
hea
ters
an
d/o
r mu
ltip
le
bo
ost
er h
eate
rs a
re m
anifo
lded
tog
eth
er, r
ever
se
retu
rn o
r eq
ual
ly y
oke
d p
ipin
g in
sure
s th
at w
ater
is
dra
wn
fro
m a
nd
en
ters
into
eac
h o
f th
e p
rim
ary
wat
er
hea
ters
an
d/o
r bo
ost
er h
eate
rs a
t an
eq
ual
(bal
ance
d)
flow
rate
. Th
is in
sure
s th
at e
ach
pri
mar
y w
ater
hea
ter
and
/or b
oo
ster
hea
ter p
erfo
rms
the
sam
e am
ou
nt
of
wo
rk d
uri
ng
hea
tin
g c
ycle
s, p
rovi
des
th
e m
axim
um
am
ou
nt
of h
ot
wat
er a
vaila
ble
fro
m s
tore
d w
ater
, an
d h
as a
pp
roxi
mat
ely
the
sam
e lif
e sp
an.
Reve
rse
retu
rn p
ipin
g is
sh
ow
n.
All
wat
er h
eate
rs m
anifo
lded
to
get
her
, or b
oo
ster
hea
ters
man
ifold
ed to
get
her
, m
ust
be
exac
tly
the
sam
e.
A
ch
eck
valv
e o
n t
he
line
fro
m t
he
pri
mar
y
hea
ter t
o t
he
bo
ost
er h
eate
r in
sure
s th
at w
ater
flo
ws
in o
ne
dir
ecti
on
on
ly. T
his
kee
ps
hig
h
25C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter(
s) w
ith
Sto
rag
e Ta
nk(
s) a
nd
Bo
ost
er H
eate
r(s)
Seq
uen
ce o
f Op
erat
ion
s
PR
IMA
RY
HEA
TER
BO
OST
ERH
EATE
R
Tan
kTe
mp
erat
ure
Co
ntr
ol
(170
°F M
ax)
STO
RA
GE
TAN
K
Hig
hTe
mp
erat
ure
Exp
ansi
on
Tan
k
TR
T
Mix
ing
Val
ve
HR
H
C
BR
B
1
C
D
2
4G
3
5
E6
F
B
A
5
B
B
B
E
EE
E
E
FF
F
F
26C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Th
e p
lug
co
ck is
use
d to
ad
just
th
e flo
w o
f
wat
er to
3-5
gal
lon
s p
er m
inu
te, w
hic
h re
du
ces
co
nd
ensa
tio
n a
nd
incr
ease
s th
e am
ou
nt
of h
ot
w
ater
ava
ilab
le b
y lim
itin
g t
urb
ule
nce
in t
he
ta
nk.
Th
erm
om
eter
s o
n h
ot
wat
er o
utl
et li
nes
are
use
d
to v
erify
wat
er o
utl
et te
mp
erat
ure
an
d s
yste
m
op
erat
ion
. H
ot
wat
er fr
om
th
e b
oo
ster
hea
ter
u
sual
ly h
as to
be
a sp
ecifi
c te
mp
erat
ure
, oft
en
185°
F fo
r a c
om
mer
cial
dis
hw
ash
er ri
nse
cyc
le.
Th
e th
erm
om
eter
s p
rovi
de
a m
ean
s to
ver
ify t
hat
th
e w
ater
pro
vid
ed is
th
e co
rrec
t te
mp
erat
ure
for
th
e ap
plic
atio
n.
A
ch
eck
valv
e o
n t
he
line
fro
m t
he
sto
rag
e
tan
k to
th
e b
oo
ster
hea
ter i
nsu
res
that
wat
er
flow
s in
on
e d
irec
tio
n o
nly
. Th
is k
eep
s h
igh
te
mp
erat
ure
bo
ost
er h
eate
r wat
er fr
om
reac
hin
g
fixtu
res
no
t co
nn
ecte
d to
th
e b
oo
ster
hea
ter’s
h
ot
wat
er o
utl
et.
Som
e ch
eck
valv
es c
an o
nly
b
e in
stal
led
ho
rizo
nta
lly.
Refe
r to
th
e ch
eck
valv
e
man
ufa
ctu
rer’s
inst
alla
tio
n in
stru
ctio
ns.
W
ater
exp
and
s as
it is
hea
ted
an
d c
ann
ot
be
co
mp
ress
ed.
A c
hec
k va
lve
in t
he
bo
ost
er
hea
ter’s
su
pp
ly c
reat
es a
clo
sed
sys
tem
,
pre
ven
tin
g t
he
wat
er fr
om
exp
and
ing
bac
k
thro
ug
h t
he
line.
An
exp
ansi
on
tan
k is
req
uir
ed
to a
bso
rb t
he
exp
and
ing
wat
er, p
reve
nti
ng
p
ress
ure
bu
ildu
p in
sid
e th
e b
oo
ster
hea
ter o
r
wat
er li
nes
.
Ho
t w
ater
fro
m p
rim
ary
wat
er h
eate
rs a
nd
/or b
oo
ster
h
eate
rs c
an b
e p
rovi
ded
wit
h o
r wit
ho
ut
reci
rcu
lati
ng
lin
es. W
hen
ava
ilab
ility
of h
ot
wat
er is
imm
edia
tely
re
qu
ired
for t
he
app
licat
ion
an
d/o
r wh
en lo
ng
run
s o
f pip
e ar
e re
qu
ired
bet
wee
n t
he
bo
ost
er w
ater
h
eate
r(s)
an
d/o
r th
e p
rim
ary
wat
er h
eate
r(s)
an
d t
he
fixtu
res,
reci
rcu
lati
ng
lin
es c
an b
e u
sed
to e
limin
ate
was
ted
wat
er a
nd
tim
e d
elay
s. R
ecir
cula
tin
g li
nes
fe
ed h
ot
wat
er fr
om
th
e b
oo
ster
hea
ter o
r ho
t w
ater
fr
om
th
e p
rim
ary
wat
er h
eate
r to
fixt
ure
s an
d re
turn
u
nu
sed
wat
er fr
om
th
e fu
rth
est
fixtu
re to
th
e w
ater
h
eate
r(s)
for r
ehea
tin
g. W
ater
flo
w t
hro
ug
h e
ach
re
circ
ula
tin
g li
ne
is c
on
tro
lled
by
a lin
e te
mp
erat
ure
con
tro
l (th
erm
ost
at) t
hat
op
erat
es a
bro
nze
cir
cula
tin
g
pu
mp
. Wh
en w
ater
tem
per
atu
re in
th
e re
circ
ula
tin
g
line
dro
ps
bel
ow
th
e lin
e te
mp
erat
ure
co
ntr
ol’s
set
p
oin
t, th
e co
ntr
ol t
urn
s o
n t
he
pu
mp
cau
sin
g h
ot
or
tem
per
ed w
ater
to c
ircu
late
th
rou
gh
th
e lin
e. F
low
ra
te in
th
e ci
rcu
lati
ng
lin
e is
ad
just
ed u
sin
g a
flo
w
reg
ula
tin
g p
lug
co
ck.
Ho
t w
ater
fro
m e
ach
bo
ost
er
hea
ter’s
reci
rcu
lati
ng
lin
e is
retu
rned
to t
he
bo
ost
er
hea
ter’s
inle
t. H
ot
wat
er fr
om
th
e st
ora
ge
tan
k’s
reci
rcu
lati
ng
lin
e is
retu
rned
to t
he
pri
mar
y h
eate
r’s
inle
t.
Ea
ch p
rim
ary
wat
er h
eate
r, b
oo
ster
hea
ter,
and
st
ora
ge
tan
k sh
ou
ld b
e in
stal
led
wit
h s
hu
toff
va
lves
an
d u
nio
ns
in w
ater
inle
t an
d o
utl
et
lines
to a
llow
iso
lati
on
an
d re
pla
cem
ent
of
fa
iled
un
its
wit
ho
ut
shu
ttin
g o
ff t
he
wat
er s
up
ply
.
Wh
en m
ult
iple
pri
mar
y w
ater
hea
ters
, an
d/o
r
sto
rag
e ta
nk(
s), a
nd
/or b
oo
ster
hea
ters
are
in
stal
led,
fun
ctio
nin
g u
nit
s ca
n re
mai
n in
ser
vice
w
hile
th
e fa
iled
un
it is
rep
lace
d.
In t
hre
e te
mp
erat
ure
sys
tem
s, th
e m
ixin
g/t
emp
erin
g
valv
e co
mb
ines
co
ld w
ater
fro
m t
he
cold
wat
er
sup
ply
lin
e w
ith
ho
t w
ater
fro
m t
he
syst
em’s
pri
mar
y h
ot
wat
er o
utl
et to
pro
vid
e a
thir
d h
ot
wat
er o
utl
et
tem
per
atu
re in
ad
dit
ion
to t
he
bo
ost
er h
eate
r o
utl
et te
mp
erat
ure
an
d t
he
sto
rag
e ta
nk’
s o
utl
et
tem
per
atu
re a
cco
rdin
g to
th
e m
ixin
g v
alve
’s se
ttin
g.
The
mix
ing
val
ve s
ho
uld
be
set
for t
he
des
ired
te
mp
erat
ure
acc
ord
ing
to t
he
app
licat
ion’
s h
ot
wat
er
req
uir
emen
t. F
or e
xam
ple
, nu
rsin
g h
om
es m
ay re
qu
ire
a m
axim
um
wat
er te
mp
erat
ure
of 1
05°F
at
sho
wer
s an
d o
ther
do
mes
tic
wat
er fi
xtu
res.
In c
om
mer
cial
ki
tch
ens,
po
t si
nks
may
req
uir
e 14
0°F
wat
er.
C
hec
k va
lves
inst
alle
d o
n t
he
lines
insu
re t
hat
w
ater
flo
ws
in o
ne
dir
ecti
on
on
ly. T
his
pre
ven
ts
the
mix
ing
of h
ott
er a
nd
co
ole
r wat
er.
A
sh
uto
ff v
alve
on
th
e in
com
ing
co
ld w
ater
su
pp
ly li
ne
allo
ws
the
syst
em to
be
shu
t d
ow
n in
th
e ev
ent
of a
n e
mer
gen
cy, o
r wh
en n
eces
sary
fo
r ser
vice
.
1
6
5
432
As
ho
t w
ater
is d
raw
n fr
om
th
e st
ora
ge
tan
k th
rou
gh
fix
ture
s, co
ld w
ater
en
ters
th
e p
rim
ary
wat
er h
eate
r n
ear t
he
bo
tto
m, l
ow
erin
g t
he
wat
er te
mp
erat
ure
b
elo
w t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
ac
tiva
tes
the
gas
bu
rner
. Th
e b
urn
er c
on
tin
ues
h
eati
ng
wat
er u
nti
l th
e te
mp
erat
ure
of t
he
wat
er a
t th
e th
erm
ost
at re
ach
es t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
sh
uts
do
wn
th
e b
urn
er. T
he
hea
tin
g c
ycle
re
pea
ts it
self
as o
ften
as
req
uir
ed.
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s se
rved
by
the
bo
ost
er h
eate
r’s h
ot
wat
er o
utl
et, h
ot
wat
er fr
om
th
e st
ora
ge
tan
k is
dra
wn
into
th
e b
ott
om
of t
he
bo
ost
er
hea
ter.
Wh
en t
he
wat
er te
mp
erat
ure
in t
he
bo
ost
er
hea
ter’s
tan
k d
rop
s b
elo
w t
he
ther
mo
stat
’s se
t p
oin
t, th
e b
oo
ster
hea
ter’s
gas
bu
rner
is e
ner
giz
ed. T
he
bu
rner
sta
ys o
n u
nti
l th
e w
ater
tem
per
atu
re in
th
e b
oo
ster
hea
ter r
each
es t
he
set
po
int
of t
he
bo
ost
er
hea
ter’s
th
erm
ost
at. T
his
cyc
le re
pea
ts it
self
as o
ften
as
req
uir
ed.
As
ho
t w
ater
is d
raw
n fr
om
th
e st
ora
ge
tan
k th
rou
gh
fix
ture
s, h
ot
wat
er fr
om
th
e w
ater
hea
ter i
s d
raw
n
into
th
e b
ott
om
of t
he
sto
rag
e ta
nk.
Wh
en t
he
wat
er
tem
per
atu
re in
th
e st
ora
ge
tan
k d
rop
s b
elo
w t
he
tan
k te
mp
erat
ure
co
ntr
ol’s
set
po
int,
the
circ
ula
tin
g p
um
p
is a
ctiv
ated
. Th
e st
ora
ge
tan
k’s
tem
per
atu
re c
on
tro
l se
t p
oin
t sh
ou
ld b
e 5-
10°F
low
er t
han
th
e p
rim
ary
wat
er h
eate
r’s t
her
mo
stat
set
tin
g.
The
circ
ula
tin
g p
um
p d
raw
s co
ol w
ater
fro
m t
he
bo
tto
m o
f th
e st
ora
ge
tan
k re
turn
ing
it to
th
e co
ld
wat
er in
let
of t
he
pri
mar
y w
ater
hea
ter.
As
coo
l wat
er
is d
raw
n fr
om
th
e b
ott
om
of t
he
sto
rag
e ta
nk
it is
re
pla
ced
by
ho
t w
ater
fro
m t
he
ou
tlet
of t
he
pri
mar
y w
ater
hea
ter.
Hea
ted
wat
er e
nte
rs t
he
sto
rag
e ta
nk
bel
ow
th
e ta
nk
tem
per
atu
re c
on
tro
l. H
eate
d w
ater
ri
ses
in t
he
sto
rag
e ta
nk
forc
ing
co
ol w
ater
to t
he
bo
tto
m o
f th
e ta
nk
wh
ere
it is
dra
wn
ou
t b
y th
e ci
rcu
lati
ng
pu
mp
. Wh
en t
he
tem
per
atu
re c
on
tro
l o
n t
he
sto
rag
e ta
nk
is s
atis
fied,
it s
hu
ts d
ow
n t
he
circ
ula
tin
g p
um
p. T
he
wat
er h
eate
r co
nti
nu
es h
eati
ng
w
ater
un
til t
he
ther
mo
stat
on
th
e w
ater
hea
ter i
s sa
tisfi
ed.
27C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
Po
lari
s® W
ater
Hea
ter
wit
h D
ish
was
her
Seq
uen
ce o
f Op
erat
ion
s
C
TR
T
Mix
ing
Val
ve
Tog
gle
Swit
ch
Fin
al R
inse
Ther
mo
met
er
Pre
ssu
reR
edu
cin
gV
alve
San
itiz
ing
Lin
eTh
erm
om
eter
DIS
HW
ASH
ER
1
BC
2
A
F
3
D
E
I
J
K
G
H
I
I
JJ
28C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
A
sh
uto
ff v
alve
on
th
e in
com
ing
co
ld w
ater
su
pp
ly li
ne
allo
ws
the
syst
em to
be
shu
t d
ow
n in
th
e ev
ent
of a
n e
mer
gen
cy, o
r wh
en n
eces
sary
fo
r ser
vice
.
and
oth
er d
om
esti
c w
ater
fixt
ure
s. In
co
mm
erci
al
kitc
hen
s, p
ot
sin
ks m
ay re
qu
ire
140°
F w
ater
.
Tem
per
ed w
ater
ou
tlet
s ca
n b
e p
rovi
ded
wit
h o
r w
ith
ou
t a
reci
rcu
lati
ng
lin
e. W
hen
lon
g ru
ns
of
pip
e ar
e re
qu
ired
bet
wee
n t
he
wat
er h
eate
r an
d
the
fixtu
res,
reci
rcu
lati
ng
lin
es a
re u
sed
to e
limin
ate
was
ted
wat
er a
nd
tim
e d
elay
s w
hile
th
e u
ser i
s w
aiti
ng
fo
r usa
ble
ho
t w
ater
at
each
fixt
ure
. Re
circ
ula
tin
g
lines
feed
ho
t o
r tem
per
ed w
ater
to fi
xtu
res
and
re
turn
un
use
d w
ater
bac
k fr
om
th
e fu
rth
est
fixtu
re to
th
e w
ater
hea
ter f
or r
ehea
tin
g. W
ater
flo
w t
hro
ug
h
reci
rcu
lati
ng
lin
es is
co
ntr
olle
d b
y a
line
tem
per
atu
re
con
tro
l (th
erm
ost
at) t
hat
op
erat
es a
bro
nze
cir
cula
tin
g
pu
mp
. Wh
en w
ater
tem
per
atu
re in
th
e re
circ
ula
tin
g
line
dro
ps
bel
ow
th
e lin
e te
mp
erat
ure
co
ntr
ol’s
set
p
oin
t, th
e co
ntr
ol t
urn
s o
n t
he
pu
mp
cau
sin
g h
ot
or
tem
per
ed w
ater
to c
ircu
late
th
rou
gh
th
e lin
e. F
low
ra
te in
th
e ci
rcu
lati
ng
lin
e is
ad
just
ed u
sin
g a
flo
w
reg
ula
tin
g p
lug
co
ck.
D
ish
was
her
s o
ften
use
qu
ick
clo
sin
g s
ole
no
id
op
erat
ed w
ater
sh
uto
ff v
alve
s th
at c
an c
ause
w
ater
ham
mer
. A
wat
er h
amm
er a
rres
tor
ab
sorb
s th
e sh
ock
in t
he
wat
er p
ipin
g fr
om
qu
ick
cl
osi
ng
val
ves.
A
n a
nti
-sip
ho
n v
alve
pre
ven
ts w
ater
fro
m t
he
d
ish
was
her
fro
m s
iph
on
ing
bac
k in
to t
he
p
ota
ble
wat
er s
up
ply
.
W
ater
flo
w in
to t
he
dis
hw
ash
er is
co
ntr
ol b
y a
p
ress
ure
-red
uci
ng
val
ve in
stal
led
on
th
e h
ot
w
ater
su
pp
ly li
ne
to t
he
dis
hw
ash
er.
Ev
ery
wat
er h
eate
r an
d d
ish
was
her
sh
ou
ld
be
inst
alle
d w
ith
sh
uto
ff v
alve
s an
d u
nio
ns
in
wat
er in
let
and
ou
tlet
lin
es to
allo
w is
ola
tio
n a
nd
re
pla
cem
ent
of f
aile
d u
nit
s w
ith
ou
t sh
utt
ing
off
th
e w
ater
su
pp
ly.
C
hec
k va
lves
inst
alle
d o
n t
he
lines
insu
re t
hat
w
ater
flo
ws
in o
ne
dir
ecti
on
on
ly. T
his
pre
ven
ts
th
e m
ixin
g o
f ho
t an
d c
old
wat
er.
As
ho
t w
ater
is d
raw
n fr
om
fixt
ure
s, co
ld w
ater
en
ters
th
e w
ater
hea
ter n
ear t
he
bo
tto
m, l
ow
erin
g t
he
wat
er
tem
per
atu
re b
elo
w t
he
ther
mo
stat
’s se
t p
oin
t. T
he
ther
mo
stat
act
ivat
es t
he
gas
bu
rner
. Th
e b
urn
er
con
tin
ues
hea
tin
g w
ater
un
til t
he
tem
per
atu
re o
f th
e w
ater
at
the
ther
mo
stat
reac
hes
th
e th
erm
ost
at’s
set
po
int.
Th
e th
erm
ost
at s
hu
ts d
ow
n t
he
bu
rner
. Th
e h
eati
ng
cyc
le re
pea
ts it
self
as o
ften
as
req
uir
ed.
A
tog
gle
sw
itch
on
th
e d
ish
was
her
is u
sed
to
co
ntr
ol p
ow
er to
th
e re
circ
ula
tio
n s
yste
m.
W
hen
tu
rned
on
, th
e to
gg
le s
wit
ch e
ner
giz
es t
he
el
ectr
ical
cir
cuit
to t
he
circ
ula
tio
n p
um
p.
A
lin
e te
mp
erat
ure
co
ntr
ol a
ctiv
ates
th
e
circ
ula
tin
g p
um
p, i
nsu
rin
g t
hat
th
e w
ater
in t
he
ci
rcu
lati
ng
lin
e is
alw
ays
the
req
uir
ed
tem
per
atu
re a
nd
sh
ou
ld b
e se
t at
185
°F.
Th
e p
lug
co
ck is
use
d to
ad
just
th
e flo
w o
f
wat
er to
3-5
gal
lon
s p
er m
inu
te, w
hic
h re
du
ces
co
nd
ensa
tio
n a
nd
incr
ease
s th
e am
ou
nt
of h
ot
w
ater
ava
ilab
le b
y lim
itin
g t
urb
ule
nce
in t
he
ta
nk.
Th
e sa
nit
izin
g li
ne
ther
mo
met
er is
use
d to
ve
rify
th
at w
ater
leav
ing
th
e ta
nk
is t
he
req
uir
ed
tem
per
atu
re.
Th
e fin
al ri
nse
th
erm
om
eter
is u
sed
by
loca
l
hea
lth
offi
cial
s an
d t
he
dis
hw
ash
er o
per
ato
r
to v
erify
th
at t
he
wat
er te
mp
erat
ure
at
the
d
ish
was
her
is a
lway
s 18
0°F,
as re
qu
ired
by
the
N
atio
nal
San
itat
ion
Fo
un
dat
ion
.
In t
wo
tem
per
atu
re s
yste
ms,
the
mix
ing
/tem
per
ing
va
lve
com
bin
es c
old
wat
er fr
om
th
e co
ld w
ater
su
pp
ly
line
wit
h h
ot
wat
er fr
om
th
e sy
stem
’s p
rim
ary
ho
t w
ater
ou
tlet
to p
rovi
de
a se
con
d h
ot
wat
er o
utl
et
tem
per
atu
re a
cco
rdin
g to
th
e m
ixin
g v
alve
’s se
ttin
g.
The
mix
ing
val
ve s
ho
uld
be
set
for t
he
des
ired
te
mp
erat
ure
acc
ord
ing
to t
he
app
licat
ion’
s h
ot
wat
er
req
uir
emen
t. F
or e
xam
ple
, nu
rsin
g h
om
es m
ay re
qu
ire
a m
axim
um
wat
er te
mp
erat
ure
of 1
05°F
at
sho
wer
s
1
3
2
29C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
No
tes
30C
opyr
ight
© A
mer
ican
® W
ater
Hea
ters
201
0. A
ll ri
ghts
rese
rved
.
No
tes
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NCBSH00308 R Oct. 2010