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8
I. BOILERS EQUIPPED WITH HYDROSTAT CONTROL
SETTING THE CONTROL
A
C
SYSTEM START-UP
At initial start up, with the Economy Feature active, the control
establishes a 63°C (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 49°C (120°F) prior to
energizing the circulator.
Water Temperature
W
t a
V
Verification of Setting
er
i
Lo
Low Temperature
[
[OFF or 43
O
F
C
C (110
B
B
D
Dynamic
y
n
am
c i
D
Display
is
p
la
y
er
er
T
e
m
per
at
ur
e
and Real Time
and R
and R
ea
l
i T
m
e
c i f
at
at
i
on
of f
S
et
t
n i
g
Adjustments.
A
dj
us
t
m
ent
. s
w w
w
T
em
per
at
ur
e
L
Limit Setting
im
it
S
e
t t
in
g
o
o
o
o
F
o
r 4
3
C
C
93
93
o
o
o
o
(
110
200
2
00
F)]
F
)]
F
Factory OFF
ac
t
or
y
O
F
F
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
HOW THERMAL TARGETING WORKS
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 temper-
ature to provide needed heat to the home. When the outside
temperature is milder, the heat demand is lower. During these
periods, the Fuel Smart HydroStat will lower the boiler's Tar-
get temperature – saving fuel – while continuing to provide
comfort to the house.
Sentry
i D
Diagnostic LEDs and
ag
nos
c i t
LE
D
s
and
Test Button
T
es
t
B
ut
t
on
B
B
J
Jumper
u
m
per
E
E
Economy Dial
c
c
onom
onom
y
y
D
D
al i
al i
(
(OFF or LO, 1, 2, 3,
O
F
F
or
LO
,
1,
2,
2,
3,
4
4, 5, HI)
, 5
,
H
I)
Indicator Light
I
ndi
c
t a
or r
i L
gh
t
(
(announces heat call)
anno
unc
es
he
at
at
c
a
) l l
High Temperature
i H
gh
T
e
m
per
at
ur
ur
e
Limit Setting
L
im
it
S
e
t t
in
g
o
o
o
o
o
o
[
[38
38
C
C
1
104
04
C (110
C
(
1
10
o
o
220
220
F)]
F
)]
D
Di erentials are
f f f f i
er
ent
al i
s
ar
e
aut
automatic and will
om
at
c i
an
d
w
w
l l i
v
vary based on control
ar
y
bas
e
d
on
c
c
ont
r
l o
s
settings and boiler
et
t
n i
gs
and
bo
i
l
er
te
te
temperature
m
m
p
p
r e
r e
at
at
ur
ur
e
e
- Quick Links:
- Boiler Water Temperature Control
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