Sequence Of Operation, Timed Cooking Mode

VPX SERIES STEAMER - ELECTRICAL OPERATION

SEQUENCE OF OPERATION

Wiring diagram 7264 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.Cooking mode switch (power) off.

C.High limit thermostat closed.

D.Standby thermostat closed.

E.Temperature control is setup properly and is ready to use.

F.Door closed (door switch closed).

G.Timer "off".

H.Cooking compartment filled to the water level mark and below standby temperature of 168°F (+5/-8).

NOTE: At temperatures below 168°F, the steamer is in a "pre-heat" state.

2.Select "timed" on the cooking mode switch.

A.Internal "pilot" light (top, amber) comes on.

B.Internal "pilot" light (bottom, red) comes on.

C.Relay "R1" energized.

1)R1-2A & R1-2B (both N.C.) open.

2)R1-3A & R1-3B (both N.O.) close.

3.Temperature control energized and evaluates input from thermocouple.

A.With temperature below set point, internal relay contacts close.

1)Heater light (green) comes on.

2)Contactor energized and heating elements are powered.

4.Temperature reaches 168°F and standby thermostat opens.

A.Internal "pilot" light (top, amber) goes out.

NOTE: Steamer will maintain standby temperature until a "cook" time is dialed on timer; or the cooking mode switch is turned to off or continuous; or the door is opened.

B.Relay "R1" de-energized.

1)R1-2A & R1-2B return to N.C. position.

2)R1-3A & R1-3B return to N.O. position.

a.Temperature control de- energized and internal relay contacts open.

a)Contactor de-energized and power removed from heating elements.

5.Set "cook" timer to desired time.

A.Timer contacts 1 & 3 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 standby temperature.

6.Temperature reaches set point and the temperature control’s internal relay contacts open.

A.Contactor de-energized and power is removed from heating elements.

7.Steamer cycles on the temperature control until "cook" time expires.

8.Time expires on "cook" timer.

A.Timer contacts 1 & 3 open, timer motor is de-energized and timing stops.

B.Timer contacts 1 & 4 close.

1)Buzzer energized and sounds.

NOTE: The buzzer continues to sound until timer dial is set to off position or additional time is set.

9.Turn "cook" timer off.

A.Steamer reverts to standby temperature and continues to cycle until a "cook" time is dialed on timer; or the cooking mode switch is turned to off or continuous; or the door is opened.

NOTE: If water level becomes low during cycling, high limit thermostat will open and low water light (red) will come on.

Continuous Cooking Mode