Instructions / Assembly

11
Sentry
u TEMP ACTIVE Indicates that the
Fuel Smart HydroStat control is pow-
ered and that the temperature function
is active.
v TEMP HIGH TEMP Illuminates
when the boiler water temperature
reaches the high limit setting. It will
r
emain lit until the water temperature falls
10° (see High Limit Differential on page
4). The Fuel Smart HydroStat prevents
burner operation while this LED is on.
w LWCO ACTIVE Indicates that the low water cut-off (LWCO)
function of the Fuel Smart HydroStat is active. When the
control is installed with a Hydrolevel Electro-Well, this LED will be
on at all times when the control is powered.
IMPORTANT: If the control is installed with a well other than the
Electro-Well, this LED will not illuminate indicating that the control
is not providing low water cut-off functionality.
❹ LWCO LOW WATER Illuminates if the boiler is in a low water
condition. The Fuel Smart HydroStat will prevent burner operation
during this condition. IMPORTANT: The system must be checked
by a qualified heating professional prior to resuming operation.
WARNING: DO NOT ADD WATER UNTIL THE BOILER
HAS FULLY COOLED.
❺ ECONOMY ACTIVE Indicates that the Thermal Targeting
function is active and the Fuel Smart HydroStat will reduce boiler
temperature to conserve fuel. The Economy feature is activated
using the ECONOMY dial. (See “How Thermal Targeting Works”
on page 4 for more information).
➏ ECONOMY TARGET When the Economy feature is active,
the Fuel Smart HydroStat continually sets target temperatures
below the high limit setting to maximize fuel efficiency. When the
boiler water reaches the target tempera-
ture, the LED illuminates and the burner
will shut down. The boiler water will con-
tinue to circulate and heat the house as
long as the thermostat call continues.
The LED will stay lit until the boiler tem-
perature drops to the differential set point
(see Target Temp Differential on page 4)
at which point the boiler will be allowed to
fire again. NOTE: This LED illuminates
regularly during normal boiler operation.
❼ TEST/SETTINGS Button
To Test Low Water Cut-Off: Press and hold the Test/Settings but-
ton for 5 seconds. The display will read LCO.
LWCO TEST LCO
The red Low Water light should illuminate and the burner circuit
(B1 and B2) should de-energize. NOTE: The control must be
installed with a Hydrolevel Electro-Well for low water cut-off func-
tionality (see page 2 for more details).
To View Current Settings: Press and release the Test/Settings Button
in short intervals to sequentially display the following settings:
HIGH LIMIT SETTING HL
q
LOW LIMIT SETTING LL
q
ECONOMY SETTING ECO
q
CURRENT TARGET TEMPERATURE ooo
q
PRE-PURGE SETTING Pur
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
ACTIVE HI TEMP ACTIVE LOW WATER ACTIVE TARGET TARGET SETTINGS
❶❷❸❹❺❻❼
TEMP LWCO ECONOMY
LED LEGEND and TEST/SETTINGS BUTTON