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1
HI TEMP illuminates when boiler water temperature
reaches high limit setting and remains lit until water
temperature falls 10°. Prevents burner operation while this
LED is on.
2
LWCO Active Indicates low water cut-off (LWCO)
function of limit control is active. When control is installed
with a well, LED is on at all times when control is powered.
Important: If control is installed with a well other than
Electro-Well, LED will not illuminate indicating control is not
providing low water cut-off functionality.
WARNING
!
Burn and scald hazard. Do not add water until boiler
has fully cooled. Failure to follow these instructions
could result in death or serious injury.
LWCO Low Water illuminates if boiler is in low water
3
condition. Limit control prevents burner operation during
this condition.
Important: Have system checked by qualifi ed service
agency prior to resuming operation.
ECONOMY Active Indicates thermal targeting function
4
is active and limit control is reducing boiler temperature to
conserve fuel. Economy feature is activated using Economy
dial.
ECONOMY TARGET Economy feature is active, limit
5
control continually sets target temperatures below high
limit setting to maximize fuel effi ciency. When boiler water
reaches target temperature, LED illuminates and burner
shuts down. Boiler water will continue to circulate and heat
the house as long as thermostat call continues. LED will
stay lit until boiler temperature drops below differential set
point at which point boiler will be allowed to fi re again.
Note: LED illuminates regularly during normal boiler
operation.
6
LWCO TEST Button
To Test Low Water Cut-Off: Press and hold Test/Settings
button for 5 seconds. Display will read LWCO.
LWCO TEST
Red Low Water light will illuminate and burner circuit (B1
and B2) will de-energize.
Note: Control must be installed with Electro-Well for low
water cut-off functionality.
15 - CONTROL FUNCTION
LCO
21
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