Demand Duo
™
R
-
Series Installation and Operation Manual
36
N
o
te
s:
•
In
st
al
la
tio
n
m
us
t co
nf
or
m
to
a
pp
lica
bl
e
co
de
a
nd
a
ll
re
qu
ire
m
en
ts
li
st
ed
in
t
he
in
st
al
la
tio
n
m
an
ua
l.
Ba
la
nc
in
g
va
lv
es
,
eq
ui
va
le
nt
p
ip
in
g,
p
re
s-
su
re
g
au
ge
s,
a
nd
t
em
pe
ra
tu
re
g
au
ge
s
are
t
o
be
u
se
d
as
n
ece
ssa
ry
to
e
ns
ure
p
ro
pe
r
flo
w
b
et
w
ee
n
un
its
.
•
C
omm
on
v
en
tin
g
of
th
is
C
at
eg
ory
1,
f
an
-
ass
is
te
d
ap
pl
ia
nce
is
p
er
m
itt
ed
. C
on
su
lt
th
e
la
te
st
v
ers
io
n
of
t
he
N
at
io
na
l F
ue
l G
as
C
od
e
(AN
SI
Z
22
3.
1/
N
F
P
A
54
).
BU
IL
D
IN
G
C
IR
C
U
LAT
IO
N
PU
MP
AN
D
H
O
T
W
A
T
ER
R
ET
U
R
N
L
IN
E
(O
PT
IO
N
AL
)
Ad
di
tio
na
l u
ni
ts
ca
n
be
in
st
al
le
d
as
il
lu
st
ra
te
d.
PI
PE
EAC
H
T
&P
AN
D
PR
V
T
O
O
PEN
D
R
AI
N
G
as
Su
p
p
ly
C
o
ld
W
ate
r
Su
p
p
ly
H
o
t
W
ate
r
Su
p
p
ly
L
in
e
F
ig
ure
3
3
