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transformer secondary is powered through a series
path to chassis ground. The other side of the
transformer secondary (12VAC) is connected to the
LLCO coil and the LLCO LED. The grounded potential
is carried through the water in the reservoir jacket to
the LLCO probe. When the kettle is in the full upright
position and the reservoir jacket fluid is at the proper
level, the fluid is in constant contact with the LLCO
probe and the circuit is completed.
When the power switch is turned ON, power is
supplied to the water level control. With the kettle in
the full upright position and the fluid level in the
reservoir jacket in contact with the LLCO probe, the
LLCO relay coil is energized. The LLCO relay contacts
WLC LLCO-NC open, WLC LLCO-NO close and the
LLCO LED turns on. When the kettle is tilted to empty
the contents, the fluid is no longer in contact with the
LLCO probe and the circuit is open. The LLCO relay
coil is de-energized and LLCO LED turns off.
Fig. 36
Fig. 37
SEQUENCE OF OPERATION
1. Conditions.
A. Kettle connected to correct voltage supply
and is properly grounded.
1) 120VAC potential across X2 and X1 on
secondary of main transformer.
B. Power switch and light (1LT) (amber) are
off.
C. Low water light (2LT) (red) is off.
D. Pressure switch (1PAS) contacts closed.
E. Temperature dial at lowest setting
(potentiometer fully CCW).
1) Internal relay contacts N.O. are open.
F. Kettle at room temperature and in the full
upright position.
2. Power switch turned ON.
A. Power light (1LT) (amber) comes on.
B. Power from secondary of main transformer
to control circuit thru pressure switch
(1PAS) N.C. contacts.
3. Water level control (WLC) energized.
A. WLC LLCO probe satisfied (fluid in kettle
reservoir jacket at proper level).
Electric Stationary and Tilting Kettles - ELECTRICAL OPERATION
Page 23 of 29 F45472 (1112)