Electrical Operation; Component Function; Sequence Of Operation - Vulcan-Hart VGCTS16 Service Manual

ROUND COUNTERTOP TILTING BRAISING PANS (16 GALLON) Gas and Electric - ELECTRICAL OPERATION
Heater Contactors . . . .
Heating Elements
(3) . . . . . . . . . . . . . . . . . . . . .
Transformer . . . . . . . . . .
Ignition Module . . . . . . .
Temperature Light . . . .
Ignition Light . . . . . . . . .
FSP (Flame Sense
Probe) . . . . . . . . . . . . . . . .
HSI (Hot Surface
Igniter) . . . . . . . . . . . . . . . .
Power Switch . . . . . . . . .
Limit Switch . . . . . . . . . .
Gas Solenoid Valve . . .
High Limit
Thermostat . . . . . . . . . . .
Control Thermostat . . .
Temperature
Controller . . . . . . . . . . . . .

SEQUENCE OF OPERATION

Electric Model
1. Conditions.
A. Braising Pan connected to correct voltage
and is properly grounded.
B. Power switch OFF.
C. High limit thermostat contacts closed.
D. Control Thermostat dial OFF.
E. Temperature light OFF.
2. Power switch turned ON.
F24643 (1217)

ELECTRICAL OPERATION

COMPONENT FUNCTION

Controls power to heating elements (electric models only).
Heat the braising pan cooking surface (electric models only).
Provides 24VAC power to ignition control module and HSI (gas models only).
Controls and monitors gas heating. Applies power to HSI for burner ignition, monitors
flame presence through FSP, controls 5-second purge time and 8.5-second ignition trial
time, and powers gas solenoid valve (gas models only).
Indicates the power switch is on and a temperature setting dialed. Light goes off when
set point temperature is reached, and will come back on when temperature drops below
set point.
Indicates gas burner is on (gas models only).
Supplies a current signal back to the ignition module, indicating the presence of a flame
(gas models only).
When ignition module applies power, the HSI element heats up to very high temperatures
to ignite the gas (gas models only).
Controls electrical power to the control circuit.
Removes electrical power to the temperature control board when the pan is tilted (gas
models only).
Allows gas flow to burner when solenoid is energized. A normally closed valve (gas
models only).
Will not allow heater contactor (on electric models) or ignition module (on gas models) to
energize if the pan surface temperature goes beyond 536°F (280°C).
Cycles power to heater contactors to maintain the set point temperature (electric models
only).
Cycles power to the ignition control module to maintain the set point temperature (gas
models only).
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A. L1 voltage supplied through high limit
thermostat contacts (N.C.) to one side of the
control thermostat.
B. L3 voltage to one side of contactor coils.
3. Turn thermostat (potentiometer) dial until a call
for heat is made.
A. Temperature light comes on.
B. L1 voltage is supplied to the other side of
contactor coils. Coils are energized and
contacts close.
C. Heating elements are then energized and
the cooking surface begins to heat up.
4. Control thermostat reaches set point
temperature and contacts (N.O.) open.