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VL SERIES STEAMER - ELECTRICAL OPERATION
Pa
g
e 39 of 88
Solid State - Auxiliary Low Level Cut-Off
This control serves as a safety backup to the main
water level control (WLC) board to meet Cal-Code
and CSD-1 code requirements. The auxiliary control
provides auxiliary low level cut-off protection to shut
off the heat source in case the water level drops
below the low level cut-off (LLCO) probe. A sin
g
le
LLCO probe is connected to the auxiliary control.
The auxiliary water level control (WLC) has input
volta
g
e (120VAC) across terminals L1 and L2 to
power the transformer primary. On one side of the
transformer secondary, power is provided to the
control by a series path throu
g
h chassis
g
round. The
other side of the transformer secondary (12VAC)
supplies power to one side of the internal relay
LLCO. As water enters the boiler, it becomes part of
the auxiliary water level control’s circuit. When the
water level in the boiler reaches the LLCO probe,
the circuit is completed.
When the main power switch is turned ON, power is
supplied to the auxiliary WLC board but no
switchin
g
occurs. On CSD-1 models, the low water
level indicator li
g
ht (amber) on the boiler control box
comes on.
When the water level reaches the low level cut-off
(LLCO) probe, the LLCO relay is ener
g
ized and
illuminates the LLCO LED. With the LLCO-2
contacts closed the auxiliary heatin
g
control is then
ener
g
ized. The LLCO relay will remain ener
g
ized
and its LED will stay lit until the water level in the
boiler drops below the LLCO probe.
When the boiler stops fillin
g
, press the manual reset
button on the boiler control box. On CSD-1 models,
this ener
g
izes the low water relay, turns off the low
water li
g
ht and ener
g
izes the heat source auxiliary
control. On Cal-Code models, this closes and locks
the manual reset switch contacts to ener
g
ize the
heat source auxiliary control.