Vulcan-hart C24EO3 User Manual download pdf (Page 18)

C24EO SERIES STEAMER - ELECTRICAL OPERATION

SEQUENCE OF OPERATION

Schematic diagram AI2851 will be used to explain

the electrical sequence of operation.

Timed Cooking Mode

1. Conditions.

A. Steamer connected to correct voltage and

is properly grounded.

B. Power switch (1S) off.

1) Relay K3 energized. K3 N.C.

contacts open.

C. High limit thermostat closed.

D. Hold thermostat closed.

E. Low water thermostat closed.

F. Temperature control is setup properly and

is ready to use.

G. Door closed (door switch closed).

H. Timer off.

I. Cooking compartment filled to the water

level mark and below hold temperature of

175°F (+/- 5°F).

J. Drain valve is closed (drain lever pushed

in).

2. Press momentary start switch (1S).

A. Limiting contactor (1CON) coil energized

thru high limit thermostat (1TAS).

1) Line voltage is supplied to one side of

heating elements.

B. Relay K2 coil energized thru low water

thermostat (2TAS).

1) K2-1 N.O. contacts close.

a. Power switch circuit is latched.

2) K2-2 N.C. contacts open.

a. Low water light (1LT) and buzzer

are de-energized.

C. ON indicator light (2LT, amber) comes on.

D. Relay K1 coil energized thru door switch

and hold thermostat (3TAS).

1) K1-3 N.O. contacts close and

regulating contactor (2CON) coil is

energized.

a. Line voltage is supplied to other

side of heating elements.

Elements heat.

2) K1-2 N.C. contacts open.

3) K1-1 N.C. contacts open (prevents

timer from being energized during pre-

heat).

3. Steamer reaches 175°F.

A. Hold thermostat opens and relay K1 coil is

de-energized.

1) K1-3 N.O. contacts close and remove

line voltage to heating element

assembly.

2) K1-1 and K1-2 N.C. contacts return to

close condition.

NOTE: Steamer will maintain hold temperature

until a cook time is dialed on timer, door is

opened, or power switch is turned off.

4. Set cook timer to desired time.

NOTE: Timer motor will not run when hold

thermostat (3TAS) is below 175°F.

A. Timer contacts close, timer motor is

energized and timing down begins.

NOTE: Additional time can be set or the cook

timer can be turned off throughout the cooking

cycle. If turned to off, steamer reverts to hold

temperature.

B. Cook light (3LT, red) comes on.

C. Temperature controller energized and

evaluates input from thermocouple.

1) If temperature is below set point,

temperature controller internal N.O.

contacts close and energize

regulating contactor (2CON) coil thru

K1-2 N.C. contacts.

a. Line voltage is supplied to other

side of heating elements.

Elements heat.

5. Temperature reaches set point and the

temperature control’s internal N.O. contacts

open.

A. Regulating contactor (2CON) coil de-

energized and power is removed from

heating elements.

6. Steamer cycles on the temperature control until

cook time expires.

7. Time expires on cook timer.

A. Timer contacts 11 & 13 open, timer motor

is de-energized and timing stops.

B. Timer contacts 11 & 14 close.

1) Buzzer energized thru K2 N.O.

contacts and sounds.

NOTE: The buzzer continues to sound until

timer dial is set to off position or additional

time is set.

C. Timer contacts 21 & 23 open, cook light

(3LT, red) goes out and temperature

controller is de-energized.

F25386 (June 2010)

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