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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 single
LLCO probe is connected to the auxiliary control.
The auxiliary water level control (WLC) has input
voltage (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 through chassis ground. 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
switching occurs. On CSD-1 models, the low water
level indicator light (amber) on the boiler control box
comes on.
When the water level reaches the low level cut-off
(LLCO) probe, the LLCO relay is energized and
illuminates the LLCO LED. With the LLCO-2
contacts closed the auxiliary heating control is then
energized. The LLCO relay will remain energized
and its LED will stay lit until the water level in the
boiler drops below the LLCO probe.
VL SERIES STEAMER - ELECTRICAL OPERATION
Page 39 of 88
When the boiler stops filling, press the manual reset
button on the boiler control box. On CSD-1 models,
this energizes the low water relay, turns off the low
water light and energizes the heat source auxiliary
control. On Cal-Code models, this closes and locks
the manual reset switch contacts to energize the
heat source auxiliary control.
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