Vulcan-Hart GRC35 Service Manual download pdf (Page 27)

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F-25114 Rev.A (07-03)

GR SERIES GAS FRYERS - ELECTRICAL OPERATION

ELECTRICAL OPERATION

COMPONENT FUNCTION

FRYER CONTROLS

Solid State or Computer

Cooking Controls

(“D” or “C” Models) .................................... Monitors and evaluates input signals to the control. Controls the cooking

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.

Control Interface

Board............................................................ Provides the output signal interface from the cooking control, to regulate

gas heating and basket lift operation. The board components consist of a

heat control Triac and two single pole N.O. relays.

Transformer................................................. Supplies 24VAC to the cooking control. If equipped with electronic ignition,

also supplies power to ignition control module. Transformer is energized

when power switch is turned on.

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

to the burners when main valve solenoid is energized. Also, regulates the

gas manifold pressure.

High Limit Thermostat ............................... Prevents the frying oil from reaching temperatures over 450°F (auto reset

@ 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).

Temperature Probe..................................... Senses temperature of frying oil. 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.

Ignition Control Module ............................. Controls and monitors gas pilot ignition. Energizes pilot valve coil on the

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.

Ignitor/Flame Sense ................................... Ignites the gas pilot 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. The spark ignitor/flame sense is a component

for the gas pilot with electronic ignition only.

Drain Valve Interlock

Switch (D VI) ................................................ 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. This

prevents the gas burners from coming on with the fry tank empty.

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Vulcan-Hart GRC35 Service Manual Page 27

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