Sequence Of Operations - Cleveland Convotherm OEB-20.20 Service And Parts Manual

When using these instructions refer to the OES 20.20 wiring schematic.
1 When incoming power (220 VAC) is connected to the combi, 220 VAC is sent to
a The contacts 2,4 and 6 of the Safety Contactor (KO)
b The terminals 2 and 5 of the Control Power Switch (S1)
2 When the Control Power Switch (S1) is turned on (closed)
a The red light on the switch is energized.
b Incoming power (220 VAC) is sent through the 2A fuses (F1.1 and F1.2) to
• The 12 vdc power supply (G1)
◊ 12vdc is sent to terminals 3 and 4 of the connector X10 on the Control
Board (A10)
• Terminal 1 of connector X12 on the Control Board (A10)
• Terminal 10 of connector X13 on the Control Board (A10)
• The return of the Supply is sent to terminal 7 of connector X13 on the Control
Board (A10)
c With 220 VAC to the Control Board (A10) The Operation Board (A11) is
energized
• An alarm will sound for one second
• All the LED's and the display will energize one at a time.
• "STARTING" will be displayed for 3 seconds
• "please wait" will be displayed
• The international model number will be displayed
• The time and date will be displayed and this will continue until the on/off
switch is depressed.
3 When the ON/OFF is depressed with the combi in the steam mode with time on the
timer, the door closed and the start switch is depressed
a The front display will include a lighted bar under the steam symbol
• When the heat circuit is energized the heat symbol will be energized
• The cooking mode symbol will be energized.
• The time display will invert and begin to count down.
b The fan circuit is energized
• If the combi fan is in the normal setting 220 VAC is sent from terminal 5 on
connector X11 through the normally closed auxiliary contacts of contactor
K57 to the coils of contactor K56 and contactors K55.1 for the upper motor
and K55.2 for the lower motor
◊ The K56 contactor closes sending 220 VAC through the Q56.1 overload to
the motors.
◊ The K55.1 contactor closes completing the high speed circuit to the upper
motor and the upper motor turns at a high speed.
◊ The K55.2 contactor closes completing the high speed circuit to the lower
motor and the lower motor turns at a high speed
CLEVELAND RANGE OES 20.20

SEQUENCE OF OPERATIONS