Electrical Operation; Component Function - Vulcan-Hart GRC35 Service Manual

GR SERIES GAS FRYERS - ELECTRICAL OPERATION

COMPONENT FUNCTION

Solid State or Computer
Cooking Controls
("D" or "C" Models) .................................... Monitors and evaluates input signals to the control. Controls the cooking
Control Interface
Board ............................................................ Provides the output signal interface from the cooking control, to regulate
Transformer ................................................. Supplies 24VAC to the cooking control. If equipped with electronic ignition,
Power Switch .............................................. Supplies power to control circuit.
Gas Combination
Valve ............................................................. Allows gas flow to the pilot when pilot valve coil is energized; and gas flow
High Limit Thermostat ............................... Prevents the frying oil from reaching temperatures over 450°F (auto reset
Temperature Probe ..................................... Senses temperature of frying oil. Converts the temperature into a
Ignition Control Module ............................. Controls and monitors gas pilot ignition. Energizes pilot valve coil on the
Ignitor/Flame Sense ................................... Ignites the gas pilot and senses the presence of a flame. The flame
Drain Valve Interlock
Switch (D VI) ................................................ A magnetic reed switch mounted on the manual drain valve that supplies a

ELECTRICAL OPERATION

FRYER CONTROLS
cycle: Activates the heat output signal to maintain frying oil temperature,
counts product cook time(s), signals the electronic alarm at the end of a
cooking cycle and activates the left and right lift output signal to operate
the basket lifts(s).
NOTE: By utilizing the same wiring harness connections, the two control
types are interchangeable between fryers.
gas heating and basket lift operation. The board components consist of a
heat control Triac and two single pole N.O. relays.
also supplies power to ignition control module. Transformer is energized
when power switch is turned on.
to the burners when main valve solenoid is energized. Also, regulates the
gas manifold pressure.
@ 415°F). 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).
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.
combination control valve and generates spark for pilot ignition. Monitors
the presence of a flame and supplies an ignition status input signal to the
cooking control. Electronic ignition models only.
presence generates a micro-amp flame sense current that is rectified to
the ignition control module. The spark ignitor/flame sense is a component
for the gas pilot with electronic ignition only.
drain valve position signal (open/closed) to the cooking control. When
drain valve is open, the drain interlock input to the control is removed. This
prevents the gas burners from coming on with the fry tank empty.
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F-25114 Rev.A (07-03)