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Figure 36 - LED Legend
1
TEMP
ACTIVE Indicates Limit Control is powered
and temperature function is active.
2
TEMP
HI TEMP Illuminates when boiler water
temperature reaches high limit setting. Remains lit until
water temperature falls 10°F. Limit control prevents burner
operation while this LED is on.
3
LWCO
ACTIVE Indicates low water cut-off (LWCO)
function of limit control is active. Boiler is factory equipped
with Hydrolevel electro-well, enabling control's low water
cut-off function. LED will be on at all times when control is
powered.
Important: If control well is replaced 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.
4
LWCO
LOW WATER Illuminates if boiler is in low
water condition. Limit control will prevent burner operation
during this condition.
Important: System must be checked by a qualified service
agency prior to resuming operation.
5
ECONOMY
ACTIVE Indicates thermal targeting
function is active and limit control will reduce boiler
temperature to conserve fuel. Economy feature is activated
using the Economy dial. See "How Thermal Targeting
Works" 16.8 page 42.
16 - OPERATING THE BOILER - SYSTEM START-UP
6
ECONOMY
TARGET Economy feature is active,
limit control continually sets target temperatures below
high limit setting to maximize fuel efficiency. 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
fire again.
Note: LED illuminates regularly during normal boiler
operation.
7
TEST/SETTINGS Button
To Test Low Water Cut-Off: Press and hold Test/
Settings button for 5 seconds. Display will read LCO.
LWCO TEST
Red Low Water light should illuminate and burner circuit
(B1 and B2) should de-energize. Note: Control must
be installed with Electro-Well for low water cut-off
functionality.
To View Current Settings: Press and release Test/
Settings button in short intervals to sequentially display the
following settings:
Display will return to boiler temperature (default) if Test/
Settings button is not pressed for 5 seconds.
43
LCO
PN 240013415 REV A [08/15/2021]
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