Sentinel
11
NOTE:
Settings can be checked
using the TEST/SETTINGS Button.
SETTING THE HIGH LIMIT
The high limit is factory set at
88°C (190°F). To adjust, turn the
HI TEMP Dial
until the desired
setting is displayed. (Setting
range: 38°C–104°C [100°–220°F])
SETTING THE LOW LIMIT
The low limit is designed to main-
tain temperature in boilers equipped with tankless
coils used for domestic hot water. The low limit is
factory set to OFF. Prior to adjusting, remove the
jumper (not equipped on all units)
. Then turn the
LO TEMP Dial
clockwise until the desired tem-
perature is displayed. For proper operation, the low
temperature limit setting should be at least 6°C (10°)
below the high limit setting. NOTE: For cold start
operation, the low limit must be turned OFF. IMPOR-
TANT: If low limit temperature cannot be set above
60°C (140°F), remove jumper
(Setting range:
OFF or 43°C–93°C [110°-200°F]).
SETTING THE ECONOMY FEATURE
The Economy Feature is factory set for a 1 zone heating system. To
adjust, turn the ECONOMY Dial
until the number displayed
equals the number of heating zones. Do not include indirect water
heaters in the number of heating zones. The Economy Feature
conserves fuel by reducing boiler temperature (see “How Thermal
Targeting Works” below). If the heating system is unable to supply
needed heat to the house, the ECONOMY Dial should be turned to
a lower setting (example: In a three zone house, turn the dial to 2 or
1). Conversely, if the boiler provides adequate heat, added fuel sav-
ings can be achieved by selecting a higher setting (example: 4 or
5). If the heating and indirect water heater signals were not separat-
ed when wiring the control, the Economy Feature should be turned
OFF to insure the boiler supplies adequate temperature to heat the
indirect tank.
ACTIVATING THERMAL PRE-PURGE (OPTIONAL)
NOTE:
Activation of this feature is not recommended for boilers with
tankless coils.
Fuel Smart HydroStat has a Thermal Pre-Purge feature to maximize
efficiency. When activated, the control will purge higher boiler tem-
peratures down to 57°C (135°F) at the start of any thermostat call
and supply the latent energy in the boiler to the heating zone that is
calling. During the purge cycle, the display will indicate Pur. If the
heat is not sufficient to satisfy the thermostat, the control will ener-
gize the burner. This feature works with single- and multi-zone heat-
ing systems utilizing circulators or zone valves. No change in wiring
is needed.
To Activate Thermal Pre-Purge
Push and hold the TEST/SETTINGS button for 20 seconds. The dis-
play will read Pur On. To deactivate the feature, push and hold the but-
ton a second time for 20 seconds. The display will read Pur OFF.
SETTING THE CONTROL
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.
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 tempera-
ture to provide needed heat to the home. When the outside tem-
perature is milder, the heat demand is lower. During these
periods, the Fuel Smart HydroStat will lower the boiler's Target
temperature – saving fuel – while continuing to provide comfort
to the house.
SYSTEM START-UP
HOW THERMAL TARGETING WORKS
I. 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
A
B
B
D
C
Dynamic
Display
Water Temperature
and Real Time
Verification of Setting
Adjustments.
Low Temperature
Limit Setting
[OFF or 43
o
C 93
o
C (110
o
200
o
F)]
Factory OFF
High Temperature
Limit Setting
[38
o
C 104
o
C (110
o
220
o
F)]
Indicator Light
(announces heat call)
Jumper
B
Diagnostic LEDs and
Test Button
Di erentials are
automatic and will
vary based on control
settings and boiler
temperature
Economy Dial
(OFF or LO, 1, 2, 3,
4, 5, HI)
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