Vulcan K20GL User Manual download pdf (Page 30)

ELECTRICAL OPERATION

COMPONENT FUNCTION (STATIONARY & TILTING MODELS)

Water Level Control

(WLC LLCO) .........

Low water level control. Monitors condition of the WLC LLCO water level probe. Protects

kettle from a low water condition in the reservoir jacket.

Probe, Water Level

(LLCO) ...............

Low Level Cut-Off (LLCO) probe connected to WLC (LLCO). Controls power to heating

circuit.

Fuse, (1FU) ........... Time delay 4 amp - 250v fuse. Located on L1 of machine supply power. Protects control

circuitry from over-currents.

Switch (1PAS),

Pressure .............

Pressure cut-out protection for the reservoir jacket. Range is 38 to 42 PSI. Removes

power from control circuit if pressure in the jacket rises above switch setting.

Transformer (1T) ..... Steps down the supply voltage to 24VAC (control circuit voltage).

Switch (1S), Power ... Controls 120VAC to kettle control circuit

Switch (2S), Tilt ...... Tilting models only. N.O. switch contacts are held closed when kettle is in the upright

position and will open to remove power from control circuit when kettle is tilted. With kettle

tilted, the N.C. switch contacts return to the closed position and energize K3 raise-enable

relay coil.

Temperature

Controller ............

Cycles power to blower motor (1MOT), heat lamp (3LT) and transformer (1T). Allows

ignition control circuit to energize and light the burner to maintain set point temperature.

An external set point potentiometer is used for temperature adjustments.

Gas Shut-Off Valve

(1SOL) ...............

Tilting models only. Additional solenoid valve to shut off the gas supply and remove line

pressure on the special gas line fittings that run through gear box (when kettle is not in

use). This increases seal life on the special fittings.

Timer (1TMR), Delay

on Make ..............

Provides a 15 second delay before energizing relay K4.

Relay, K4 ............. Relay contacts provide 24VAC input signal to blower speed control connector pins (J5.4

or J5.3) for blower motor low and high speed operation.

Relay, Raise-Enable,

K3 ....................

Power tilting option only. Allows kettle to raise when the tilt switch (2S) is un-operated

( kettle tilted) and K3 raise-enable N.O. contacts are closed. K3 relay coil is energized

through the N.C. contacts on tilt switch (2S).

Blower Speed Control ...Controls blower motor speed via a 24VDC pulse width modulation (PWM) signal to the

blower motor. 24VAC voltage signal to the control and the control's switch settings (S1,

SW2 & SW4) determine low speed or high speed blower operation.

Blower Motor (1MOT) ... Draws gas from the gas valve outlet into the blower housing for the gas/air mixture

delivered to the burner.

Gas Valve ............ Regulates gas line supply pressure down to atmospheric pressure level and functions as

a "zero pressure regulator". The dual solenoid valve (1 main; 1 safety backup) is attached

at the air inlet on the blower motor housing. Gas valve receives power from ignition

module.

Ignition Module ...... Controls and monitors burner ignition. Energizes main valve coil and generates spark for

burner ignition. Monitors the presence of flame. Includes an accessible fast acting 3 amp

- 250v fuse to protect ignition module.

Ignitor/Flame Sense ... Ignites the gas burner and senses the presence of flame. The flame presence generates

a micro-amp flame sense current that is rectified to the ignition module.

Light (1LT), Power ... Amber (AM) colored light. On when power switch is on.

K Series Gas Kettles 2/3 Jacketed Stationary and Tilting - ELECTRICAL OPERATION

F45461 Rev. A (0713) Page 30 of 44

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Vulcan K20GL User Manual Page 30

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