8
TEMP ACTIVE Indicates that the Fuel Smart
HydroStat control is powered and that the temperature
function is active.
TEMP HI TEMP Illuminates when the boiler water
temperature reaches the high limit setting. It will remain lit
until the water temperature falls 10°. The Fuel Smart
HydroStat prevents burner operation while this LED is on.
See Differential explanation on page 7.
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.
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.
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 7 for more information).
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
temperature, the LED illuminates and the burner will shut
down. The boiler water will continue to circulate and heat the
house as long as the thermostat call continues. The LED will
stay lit until the boiler temperature drops below the
differential set point at which point the boiler will be allowed
to fire again. See Differential explanation on page 7.
NOTE: This LED illuminates regularly during normal boiler
operation.
TEST/SETTINGS Button
To Test Low Water Cut-Off: Press and hold the Test/
Settings button for 5 seconds. The display will read LCO.
LWCO TEST
00
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 functionality (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
00
LOW LIMIT SETTING
00
ECONOMY SETTING
000
CURRENT TARGET TEMPERATURE
PRE-PURGE SETTING
000
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
LED LEGEND and TEST/SETTINGS BUTTON
(4 pages)
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