Water Level Control Operation; Sequence Of Operation; Electric Models - Vulcan-Hart VSX3E Service Manual

The water level control (WLC) has line voltage across terminals 11 and 12 which powers the primary side of the
transformer. The secondary side of the transformer provides power to the control by a series path through
chassis ground; through the water in the steam generator tank; through the water level probes; to the internal
relay coils on the control. The other side of the secondary winding is attached to the control that directs the power
to the other side of the internal relay coils. As water enters the tank, the water becomes part of the circuit. As the
water level reaches the probes, the circuit with that particular probe is completed to the water level control, thus
energizing the internal relay coil. LED's on the board for LLCO and HL relays will illuminate as the water level
reaches each of these probes. When the water level drops below the LL probe, the HL relay LED will go out until
the water level reaches the HL probe again. This LED will go on and off during a cook cycle as the tank water
level raises and lowers. The LLCO LED will only go out if the water level drops below the low level probe.

ELECTRIC MODELS

INITIAL FILL & PREHEAT
1. Conditions.
A. Unit connected to correct voltage.
B. Supply water valve "on".
C. Power switch "off".
D. High limit thermostat closed.
E. Control Thermostat closed.
F. Drain open and steam generator tank
(referred to as tank) empty.
G. Door closed.
VSX SERIES STEAMER - ELECTRICAL OPERATION

WATER LEVEL CONTROL OPERATION

SEQUENCE OF OPERATION

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H. Timer "off".
I. Tank and WLC properly grounded. (share
common ground)
2. Power switch turned "on".
A. L1 voltage to one side of 1M; Pin 11, WLC;
1SOL, 1K; 2K; 1CON; 2CON; 2LT; 2SOL;
BUZZER; TM.
B. L3 voltage to one side of 1M, drain motor;
pins 4,8 & 12 of water level control.
1) 1M drain motor energized; drain valve
closed.
2) 1SOL energized thru HL-2; Water flows
to tank.
3. Water reaches LLCO probe.