9
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 6.
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
Indicates that the boiler is in a
low water condition. The HydroStat control will prevent burner
operation during this condition. If the LOW WATER light is
blinking, the control has been programmed to provide lock-
out protection in the event a low water condition is detected
(see Manual Reset Low Water Cut-Off on page 8). Pressing
the TEST/SETTINGS button will reset the control.
IMPORTANT:
The system must be checked by a qualified
heating professional prior to resuming operation.
WARNING: ALLOW THE BOILER TO FULLY COOL
BEFORE ADDING WATER.
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 6.
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
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
DAMPER POWER
LED
Indicates the control is energizing the vent damper. For
applications where the vent damper is not plugged into the
HydroStat, the LED indicates that the burner circuit (B1 - B2)
is powered.
If this LED is on and the burner is not firing:
1. Make sure the plug connection (or jumper, on boilers
where vent damper plug is not used) is secure.
2. Make sure that the plug connection at the vent damper end
is secure and oriented correctly.
3. Make sure damper motor turns
4. Verify the damper end switch has closed
Carbon Monoxide Hazard:
If the burner fires
when the vent damper is not fully opened or there is any
other blockage in the flue, dangerous flue products,
such as carbon monoxide, will escape into the living
space causing severe personal injury or death. The flue
as well as the vent damper must be checked for proper
operation before allowing the system to operate.
LED LEGEND and TEST/SETTINGS BUTTON
DANGER