Cleveland Convotherm OEB-20.20 Service And Parts Manual page 43

• If the ground is not found 220 VAC is sent from terminal 7 on connector X12
on the Control Board (A10) to the fill solenoid (Y3)
• The fill solenoid opens and the generator is filled until both probes are
grounded.
◊ If the top probe becomes ungrounded for more that 5 seconds the fill
solenoid (Y3) will energize.
◊ If the bottom probe becomes ungrounded the combi will fill immediately
and the combi will not heat
d When the terminal 2 on connector X15 is grounded
• 220 VAC is sent from terminal 4 of connector X12 on the Control Board
(A10) through the normally closed auxiliary contacts of K4 to the coil of
Contactor K1 until the steam generator get to 190 degrees F (probe B4).
◊ The contactor K1 closes and 220 VAC is sent to the 9.4 KW element (E1)
◊ The normally closed auxiliary contact of K1 opens preventing the Hot Air
Contactor K4 from energizing
• 220 VAC is sent from terminal 8 of connector X11 on the Control Board
(A10) through the normally closed auxiliary contacts of K44 to the coil of
Contactor K2 until the steam generator get to 190 degrees F (probe B4).
◊ The contactor K2 closes and 220 VAC is sent to the 6.27 KW element
(E2)
◊ The normally closed auxiliary contact of K2 opens preventing the Hot Air
Contactor K4 from energizing
4 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
• NOTE: If the temperature is less than 212 degrees F than fan will be pulsed
on for 2 seconds every 60 seconds after the cabinet set temp (B6).
• 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 contactors K55 and K56
◊ The K55 and K56 contactors close sending 220 VAC through the Q56
overload to the motor and the motor turns at a high speed.
◊ The normally closed auxiliary contacts of both K55 and K56 open
preventing the K57 contactor from energizing.
• If the combi fan is in the reduced setting 220 VAC is sent from terminal 6 on
connector X11 through the normally closed auxiliary contacts of contactors
K55 and K56 to the coil of contactor K57
◊ The K57 contactor closes Sending 220 VAC through the Q57 thermal
overload to the motor and the motor turns at a reduced speed.
◊ The normally closed auxiliary contacts of K57 open preventing the K55
and K56 contactors from energizing.