Vulcan-Hart C24EA3 208/240V PRO, C24EA5 480V BASIC Sequence Of Operation, Basic Model

MODEL C24EA - ELECTRICAL OPERATION

SEQUENCE OF OPERATION

A.Internal latching relay (ILR) coil on WLC board energizes.

Refer to the correct wiring diagram for model being serviced when reviewing sequence of operation.

NOTE: If power switch is set to off when service voltage is applied, steamer will enter the timed drain cycle.

Basic Model

1.Conditions

A.Steamer connected to correct voltage.

1)120VAC present across X1 & X2 on secondary side of main transformer.

B.Steamer connected to water supply with correct water requirements.

C.Power switch is off (drain handle pulled out).

1)Time delay relay timed out. Timer has no output on terminal 1.

D.Condensate thermostat is open.

E.High limit thermostat closed.

F.Pressure switch is closed.

G.Hold thermostat open.

H.Drain open and steam generator tank (referred to as tank) is empty.

I.Steamer door open.

J.Timer is off.

K.Water level control (WLC) and tank properly grounded.

2.ON/OFF lever pushed in.

A.Manual linkage closes drain valve and operates power switch.

1)N.O. contacts close.

B.Amber power light illuminates.

C.X1 potential to L1 of WLC board.

1)120VAC across L1 & L2 of WLC board.

2)High level coil (HL) energized on WLC board. HL LED on WLC board lights.

3.Slow fill solenoid energized through closure of HL contacts. Tank fills.

4.Water level reaches Low Level Cut-Off (LLCO) probe.

A.LLCO coil is energized. LLCO LED on WLC board lights.

B.LLCO N.O. contacts close enabling heating element circuit.

5.Limiting and regulating contactor coils energize. Power to heating element. Tank water heats.

6.Water level reaches Low level (L) probe.

A.No action as internal latching relay (ILR-1) contacts are open.

B.High level (HL) coil de-energized by ILR-2 contacts opening.

C.Slow fill solenoid de-energized by opening of HL contacts on WLC board.

8.Tank water reaches 195E F. Hold thermostat contacts close.

A.Relay K1 energizes. Timer circuit is enabled through closure of N.O. contacts K1-5/3 and K1-6/4.

B.Temperature in tank is maintained at 195E F by hold thermostat control of regulating contactor through relay contacts K1-1/5.

9.Timer knob set to time other than zero.

A.Timer motor energized through closure of N.O. contacts K1-6/4 when time set is greater than zero. Door switch closure allows 120VAC across timer wires 18 & 19. Timer counts down from set time.

B.Tank temperature maintained by control of regulating contactor coil through N.O. contacts K1-6/4 and (Timer -1/3, door switch, K1-5/3).

10.Steamer door is closed.

A.Regulating contactor remains energized as long as time remains on Timer and door is closed.

1)Heating element energized continuously.

11.Temperature of condensate exiting cooking cavity increases to above 135EF.

A.Condensate thermostat closes energizing cooling solenoid 1SOL. Condensate is cooled in drain box before entering facility drain system.

12.Door opened during timed cook cycle.

A.Timer continues count down until time equals zero even if steamer door is opened.

B.Regulating contactor de-energized until below 195EF.

13.Time reaches zero.

A.Buzzer is energized through N.O. contacts K1-6/4 and Timer - 1/4.

1)Buzzer remains energized until timer knob is turned to OFF, new time is set or drain handle is pulled out (power switch off).

14.Drain handle pulled out. Tank drains.

A.Power light (1LT-Amber) turns off.

7.Water level reaches high level (H) probe.

F25213 (May 2006) Page 42 of 52