FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION
Timer Cycle, Cooking
(KX Thermostat or Solid State Control)
NOTE: The "Cook" timer operates independently of the heating cycle. Additional time can be set or the timer can be turned OFF throughout the cooking cycle.
1.With the power switch turned ON, power is supplied to "Cook" timer terminal 1.
2.Set "Cook" timer to desired time .
A.Contacts 1 & 3 close, timer motor is energized and timing "down" begins.
3.Time expires on "Cook" timer .
A.Contacts 1 & 3 open, timer motor is de- energized and timing stops.
B.Contacts 1 & 4 close.
1)Buzzer energized and sounds.
NOTE: The buzzer continues to sound until the timer dial is set to the OFF position or additional time is set.
Cool Down Cycle
(KX Thermostat or Solid State Control)
1.Conditions.
A.Oven is ON.
B.Oven cavity temperature needs to be lowered.
C.Doors are open (door switch contacts OPEN).
D.Fan speed switch (S3) set to "Hi".
2.Power Switch (S1) turned to COOL DOWN.
A.Power ON light (Amber) goes out.
B.Convection fan motor energized.
NOTE: Fan speed switch (S3) can be set to operate at high or low fan speed.
3.If doors are CLOSED (door switch contacts CLOSED):
A.Power ON light (Amber) comes ON.
B.1CON coil is energized but heating elements are not powered.
C.Component cooling fan energized.
D.Power is supplied to:
1)"Cook" timer terminal 1. If a time is dialed, timer will operate and buzzer will sound when timer reaches zero.
2)Oven cavity light switch (S3) wire #1. Turns cavity lights ON/OFF; does not affect "Cool down" cycle.
4.The oven will remain in this condition until the power switch (S1) is turned to the OFF or ON position.
VC4EC, VC6EC (Computer Control)
Schematic diagram 6536 will be used to explain the electrical sequence of operation or both the "Cook" cycle and the "Cook and Hold" cycle.
Cook Cycle
1.Conditions.
A.Oven connected to correct voltage and is properly grounded.
B.Power switch (S1) OFF.
C.Computer control is setup properly and ready to use.
NOTE: The set point temperature of the computer control will be the last temperature that was set.
D.High limit thermostat CLOSED.
E.Oven doors closed (door switch contacts CLOSED).
F.Oven cavity temperature below 140°F.
2.Power switch (S1) turned ON.
A.1CON coil energized.
B.24VAC transformer (T1) is energized.
1)Computer control is energized and performs a power ON self test before energizing outputs. If the control passes self test, then the outputs are energized and operation sequence continues. If control does not pass self test then the corresponding error code is displayed.
C.Component cooling fan energized.
D.Power is connected to:
1)Terminal 1 on solid state relay 1 (SSR1 - load side) and solid state relay 2 (SSR2 - load side).
2)Pin 3
3)Oven cavity light switch (S2). Turns cavity lights ON/OFF; does not affect "Cook" cycle.
3.Computer control senses oven cavity temperature through probe input. With the oven cavity temperature below set point, the output from pin
A.Oven "Heat Light" on the control comes ON.
B.2CON coil energized.
Page 35 of 60 |
| F25105 (December 2001) |
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