Electrical Operation; Component Function - Fryer Controls - Vulcan-Hart VK Series Service Manual

VK and TR GAS FRYERS W/Wo KleenScreen PLUS - ELECTRICAL OPERATION

COMPONENT FUNCTION - FRYER CONTROLS

Ignitor/ Ground (After
12/1/12) . . . . . . . . . . . . . .
Ignition/Blower control
board (After 12/1/12) . . .
Analog (A), Solid State
(D) or Computer
Cooking Control (C) . . .
Control Interface
Board (D and C fryers
only) . . . . . . . . . . . . . . . . .
Transformer . . . . . . . . . .
Power Switch . . . . . . . .
Modulating Gas Valve . . . Allows the gas flow to modulate between low and high flame when gas valve coil is
High Limit Thermostat . . .Prevents the shortening from reaching temperatures over 450°F (auto reset @ 415°F).
Temperature Probe . . .
Drain Valve Interlock
Switch (DVI) . . . . . . . . . .
Ignition Control
Module (Before
12/1/12) . . . . . . . . . . . . . .
Ignitor/Flame Sense
(Before 12/1/12) . . . . . .
Burner Time Delay
Relays (Before 12/1/12)
. . . . . . . . . . . . . . . . . . . . . . . .
Blower Relay (Before
12/1/12) . . . . . . . . . . . . . .
Blower Control Board
(Before 12/1/12) . . . . . .
F45474 (0413)

ELECTRICAL OPERATION

Ignites the gas burner and senses the presence of a flame. The flame presence generates
a micro-amp flame sense current that is rectified to the ignition control module.
Provides the output signal interface from the cooking control to operate the burner blower
motor in low or high speeds, controls and monitors gas burner ignition. Monitors the
presence of a flame and supplies an ignition status input signal to the cooking control,
Monitors and evaluates input signals to the control: Activates heat output signal to
maintain shortening temperature; counts product cook time(s) and signals the electronic
alarm at the end of a cooking cycle; activates the left and right lift output signal to operate
the basket lifts(s); and activates filter output signal to power the fill solenoid valve.
NOTE: By utilizing the same wiring harness connections D and C controls are
interchangeable between fryers.
Provides the output signal interface from the cooking control to regulate gas heating,
basket lift operation and fill solenoid valve operation. The board components consist of
a heat control Triac and K1, K2 & K3 N.O. relays.
Supplies 24VAC to the cooking control, also supplies power to ignition control module.
Transformer is energized when power switch is turned on.
Supplies power to control circuit for fryer operation and filtering.
energized.
Serves as a backup to the cooking control's high temperature alarm setting of 415°F
(normal operation resumes when temperature falls below this point).
Senses temperature of shortening. Converts the temperature into a resistance valve
which is monitored by the cooking control. The probe is an RTD (resistance temperature
detector) of the Thermistor type. As temperature increases the resistance value
decreases.
A magnetic reed switch mounted on the manual drain valve that supplies a drain valve
position signal (open/closed) to the cooking control. When drain valve is open, the drain
interlock input to the control is removed (magnetic reed switch contacts open). This
prevents gas burners from coming on with the fry tank empty.
Controls and monitors gas burner ignition. Monitors the presence of a flame and supplies
an ignition status input signal to the cooking control.
Ignites the gas burner and senses the presence of a flame. The flame presence generates
a micro-amp flame sense current that is rectified to the ignition control module.
These relays are used in conjunction with the burner either in high or low fire settings.
When the relay coil is energized, it supplies voltage to operate the burner blower motor.
Provides the output signal interface from the cooking control to operate the burner blower
motor in low or high speeds. The board components consist of 4 dip switches, SW2 and
SW4.
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