Instructions / Assembly

D
ynamic
Display
Water Temperature
and Real Time
Verification of
Setting Adjustments.
L
ow Temperature
Limit Setting
(OFF or 110°-200°F)
Factory OFF
H
i
gh Temperature
Limit Setting
(100°-220°F)
Factory 190°F
Diagnostic LEDs
a
nd Test Button
Jumper
Economy Dial
(OFF or LO, 1, 2, 3,
4, 5, HI)
Indicator Light
(announces heat call)
Differentials are
automatic and will
vary based on
control settings and
boiler temperature.
10
Sentry
N
O
T
E
: S
e
t
t
i
n
g
s
ca
n
b
e
ch
e
c
k
e
d
u
si
n
g
t
h
e
T
E
S
T
/
S
E
T
T
I
N
G
S
B
u
t
t
o
n
.
SET
T
I
NG T
HE
HI
GH
L
I
M
I
T
T
h
e
h
ig
h
lim
it
is
f
a
c
t
o
r
y
s
e
t
a
t
1
9
0
°F
.
T
o
a
d
j
u
s
t,
tu
rn
th
e
H
I
T
EM
P
Dia
l
A
u
n
t
il
t
h
e
d
e
s
ir
e
d
s
e
tti
n
g
i
s
d
i
s
p
l
a
ye
d
.
(S
e
tti
n
g
r
a
n
g
e
:
1
0
0
°
-
2
2
0
°
F
)
SET
T
I
NG T
HE
L
O
W
L
I
M
I
T
T
h
e
lo
w
lim
it
is
d
e
s
ig
n
e
d
t
o
m
a
in
-
t
a
in
t
e
m
p
e
r
a
t
u
r
e
in
b
o
ile
r
s
e
q
u
ip
p
e
d
wit
h
t
a
n
k
le
s
s
c
o
ils
u
s
e
d
fo
r
d
o
m
e
s
t
ic
h
o
t
wa
t
e
r
.
T
h
e
lo
w
lim
it
is
f
a
c
-
t
o
r
y
s
e
t
t
o
OF
F.
Pr
io
r
t
o
a
d
ju
s
t
in
g
,
r
e
m
o
ve
t
h
e
ju
m
p
e
r
(
n
o
t
e
q
u
ip
p
e
d
o
n
a
ll u
n
it
s
)
B
.
T
h
e
n
t
u
r
n
t
h
e
L
O
T
EM
P
Dia
l
C
clo
c
kwise
u
n
t
il t
h
e
d
e
sir
e
d
t
e
m
p
e
ra
t
u
r
e
is d
is
-
p
la
y
e
d
.
F
o
r
p
r
o
p
e
r
o
p
e
ra
t
io
n
,
t
h
e
low t
e
m
p
e
ra
t
u
r
e
lim
it
se
t
t
in
g
sh
o
u
ld
b
e
a
t
le
a
st
1
0
°
b
e
low t
h
e
h
ig
h
lim
it
se
t
-
t
in
g
.
NOT
E: F
o
r
co
ld
st
a
rt
o
p
e
ra
t
io
n
,
t
h
e
low lim
it
mu
st
b
e
t
u
r
n
e
d
OF
F.
I
M
PORT
ANT
: I
f
low lim
it
t
e
m
p
e
ra
t
u
r
e
ca
n
n
o
t
b
e
se
t
a
b
ove
1
4
0
°
F
,
r
e
m
ove
ju
m
p
e
r
B
.
(
Se
t
t
in
g
ra
n
g
e
:
OF
F
o
r
1
1
0
°
-
2
0
0
°
F
)
.
SET
T
I
NG T
HE
ECONOM
Y
F
EA
T
URE
T
h
e
Eco
n
o
my
Fe
a
t
u
r
e
is
f
a
ct
o
ry
se
t
fo
r
a
1
zo
n
e
h
e
a
t
in
g
syst
e
m
.
To
a
d
ju
st
,
t
u
r
n
t
h
e
ECONOM
Y
Dia
l
D
u
n
t
il
t
h
e
nu
m
b
e
r
d
is
-
p
la
y
e
d
e
q
u
a
ls t
h
e
nu
m
b
e
r
o
f
h
e
a
t
in
g
zo
n
e
s.
Do
n
o
t
in
clu
d
e
in
d
i
-
r
e
ct
wa
t
e
r
h
e
a
t
e
r
s in
t
h
e
nu
m
b
e
r
o
f
h
e
a
t
in
g
zo
n
e
s.
T
h
e
Eco
n
o
my
Fe
a
t
u
r
e
co
n
se
rve
s f
u
e
l b
y r
e
d
u
cin
g
b
o
ile
r
t
e
m
p
e
ra
t
u
r
e
(
se
e
“
How
T
h
e
r
m
a
l T
a
r
g
e
t
in
g
W
o
rks” b
e
low)
.
I
f
t
h
e
h
e
a
t
in
g
syst
e
m
is u
n
a
ble
t
o
su
p
p
ly n
e
e
d
e
d
h
e
a
t
t
o
t
h
e
h
o
u
se,
t
h
e
ECONOM
Y Dia
l sh
o
u
ld
b
e
t
u
r
n
e
d
t
o
a
low
e
r
se
t
t
in
g
(
e
xa
m
p
le
:
I
n
a
t
h
r
e
e
zo
n
e
h
o
u
se,
t
u
r
n
t
h
e
d
ia
l t
o
2
o
r
1
)
.
Co
n
ve
r
se
ly,
if
t
h
e
b
o
ile
r
p
r
ovid
e
s a
d
e
q
u
a
t
e
h
e
a
t
,
a
d
d
e
d
f
u
e
l
savin
g
s
ca
n
b
e
a
ch
ieve
d
b
y
se
le
ct
in
g
a
h
ig
h
e
r
se
t
t
in
g
(
e
xa
m
p
le
: 4
o
r
5
)
.
I
f
t
h
e
h
e
a
t
in
g
a
n
d
in
d
ir
e
ct
wa
t
e
r
h
e
a
t
e
r
sig
n
a
ls w
e
r
e
n
o
t
se
p
a
ra
t
e
d
wh
e
n
wir
in
g
t
h
e
co
n
t
r
o
l,
t
h
e
Eco
n
o
my
Fe
a
t
u
r
e
sh
o
u
ld
b
e
t
u
r
n
e
d
OF
F
t
o
in
su
r
e
t
h
e
b
o
ile
r
su
p
p
lie
s
a
d
e
-
q
u
a
t
e
t
e
m
p
e
ra
t
u
r
e
t
o
h
e
a
t
t
h
e
in
d
ir
e
ct
t
a
n
k.
ACTIVATING
THERMAL PRE-PURGE (OPT
IONAL
)
NOTE:
Activa
tion
of
this
fe
atu
re
is
n
o
t
re
commended for boilers
with ta
nkless
coils.
F
uel Smar
t
Hyd
roSta
t has
a
T
herma
l
Pre
-Pu
rge feature to
maximiz
e e
fficie
n
cy. W
hen activate
d, the con
tro
l will purge higher
boile
r te
mper
ature
s down to
1
35° at th
e sta
r
t of a
n
y thermostat
ca
ll and sup
ply
th
e late
nt
ene
rg
y in
the
boiler to
th
e
heating zone
th
a
t is
c
a
lling
. Durin
g
th
e p
u
rg
e
c
y
c
le
, the
d
is
p
la
y
will ind
ic
a
te Pu
r
.
If th
e h
e
at is
n
ot s
uffic
ien
t to
s
a
tis
fy
the th
e
rmo
s
ta
t, th
e c
o
ntro
l will
e
n
e
rgize
the
bu
rner
. Th
is
fea
ture
wo
r
k
s
with
s
ingle-
a
n
d
multi-zone
h
eating
s
y
s
tems
u
tiliz
ing c
irc
u
lato
rs
or zone
v
a
lve
s. No c
h
ang
e
in
wirin
g
is
ne
ede
d
.
T
o Activ
a
te
The
r
m
al Pr
e-Pur
ge
Pu
sh
a
n
d
h
o
ld
t
h
e
TEST/
SETTI
NG
S bu
t
t
o
n
f
o
r 2
0
se
co
n
d
s
. Th
e
d
is
-
p
la
y
will
re
a
d
Pu
r
O
n
.
T
o
d
e
a
ct
iva
t
e
t
h
e
f
e
a
t
u
re
,
p
u
sh
a
n
d
h
o
ld
t
h
e
bu
t
t
o
n
a
se
c
o
n
d
t
im
e
f
o
r
2
0
s
e
co
n
d
s
.
Th
e
d
isp
la
y
will
re
a
d
Pu
r
O
FF
.
SETTING THE CONTROL
At initial start up, with the Economy Feature active, the control
establishes a 145°F target temperature. To test the high limit
shut-off function, the Economy Dial must be turned to OFF.
Once tested, restore the Economy setting. If the heating
demand is high, the target will increase over time to satisfy the
heat load. NOTE: To reduce the potential for condensing, the
control will allow the boiler to heat to 120°F prior to energizing
the circulator.
Thermal Targeting technology analyzes thermostat activity and
continually evaluate how much heat the house requires. When
it is very cold outside, the heat demand is high and the Fuel
Smart HydroStat will raise the boilers Target temperature to
provide needed heat to the home. When the outside tempera-
ture is milder, the heat demand is lower. During these periods,
the Fuel Smart HydroStat will lower the boilers Target temper-
ature – saving fuel – while continuing to provide comfort to the
house.
SYSTEM START-UP HOW THERMAL TARGETING WORKS
BOILERS EQUIPPED WITH HYDROSTAT CONTROL
SETTING
OFF Disables economy function. Will allow boiler to fire until hi
limit temp is reached and re-fire with a 10° subtractive
differential.
LO Provides lowest level of fuel savings. Use this setting only
if the house does not stay warm at higher settings.
1 Recommended setting for single zone systems
2 Recommended setting for Two zone systems
3 Recommended setting for Three zone systems
4 Recommended setting for Four zone systems
5 Recommended setting for Five zone systems
HI Provides highest level of fuel savings