For accurate and dependable
boiler protection, Taco's Low Water Cutoff (LWCO) features the
simplicity, reliability and
unmatched quality you’ve come to expect from Taco Electronic
Controls. The LWCO is a probe style, microprocessor based
control that detects the fluid level in hot water and steam
boilers. Probe sensitivity is adjustable, thanks to a new
patent pending technology, and external LEDs and simplified
wiring make installation and testing a snap.
Taco LWCO provides reliable protection for all types of
boilers, from small residential hot water boilers to large
industrial steam boilers. The boiler’s minimum safe
operating water level is specified by each manufacturer.
Should the water level dip below that specified level, heat
will accumulate quickly causing significant damage to the
boiler and a potential external safety hazard. The Taco LWCO
prevents this hazard from occurring.
The LWCO can act as either the primary or secondary low water
cutoff on low-pressure steam boilers, the primary limit
control on hot water boilers or to protect pumps from running
dry in condensate receiver tank applications. The LWCO can
also activate alarm systems or automatic water feeders.
Probe Style LWCO
A probe uses the boiler’s
water to complete an
electrical circuit. As long
as water covers the probe, the electronic
circuit will be maintained.
If the water level drops
below the probe, the circuit is
broken, shutting down the burner and
protecting the boiler.
Normal operation Low water
condition In a low
water situation, if the burner continues to fire, damage
can occur to the boiler and create a potential disaster.
A Taco Low Water Cutoff turns off the burner and
signals that a low water situation has occurred.
Choosing The Right Type
With two basic controls, Taco has simplified the process of
choosing the right one. Our LT models include an external test
button, adjustable Delay On Break (DOB) and a Delay On Make
(DOM) feature; our LN models do not. DOB keeps the burner lit
for up to 60 seconds after the probe stops sensing water. DOM
allows up to a 15-second delay
before firing the burner once water has come in contact with
the probe. Generally, LT models will be used on larger hot
water boilers and all steam boilers; LN models will be used on
smaller residential hot water boilers (under 400,000 BTU).
Consult your local inspector for applicable codes.
Customize for your
Choose LT or LN, then add the
features you need.
Automatic Reset Mode
A red LED indicates a low water
condition. When the water level
reaches a safe level, the boiler
will automatically resume
normal operation. The
LWCO control may be used
in conjunction with an
automatic water feeder to
keep the boiler filled to
the proper level. Adjustable
DOM and DOB settings are
standard on all LT series auto
Manual Reset Mode
The red LED indicates a low
water condition. When a
low water condition occurs,
the Manual Reset Button must
be pressed to resume boiler operation
once the proper water level
has been restored. The control may be used in conjunction
with an alarm. DOM settings are disabled.