HydroStat User Guide

8
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TEMP ACTIVE Indicates that the Fuel Smart
HydroStat-IC control is powered and that the temperature
function is active.
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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 HydroStat-IC
prevents burner operation while this LED is on. See
Differential explanation on page 12.

LWCO ACTIVE Indicates that the low water cut-off
(LWCO) function of the HydroStat-IC 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.
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LWCO LOW WATER Indicates that the boiler is in a
low water condition. The HydroStat-IC 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 10).
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.
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ECONOMY ACTIVE Indicates that the Thermal
Targeting function is active and the HydroStat-IC 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).

ECONOMY TARGET When the Economy feature is
active, the HydroStat-IC 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 12.
NOTE: This LED illuminates regularly during normal boiler
operation.
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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
LCO
0
The red Low Water light should illuminate and the burner
circuit 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
HL
왔
LOW LIMIT SETTING LL
왔
ECONOMY SETTING ECO
0
왔
CURRENT TARGET TEMPERATURE ooo
왔
FLAME CURRENT FLA
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
NOTE: Flame Current reading will remain in the display for
30 seconds to allow for pilot adjustment
LED LEGEND and TEST/SETTINGS BUTTON
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