Cleveland Convotherm OEB-20.20 Service And Parts Manual page 61

e When the condensate box is heated to 140 degrees F at the B3 probe, 220 VAC is
sent from terminal 5 of connector X12 to the condenser valve (Y1) until the
temperature drops.
f When the timer counts to 0 or the core temp probe (B10) reaches the set amount
the cycle ends.
4 With the combi in the Hot Air 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 Hot Air 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 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
◊ The normally closed auxiliary contacts of K55.1, K55.2 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
K55.1, K55.2 and K56 to the coil of contactor K57
◊ The K57 contactor closes
(a) 220 VAC is sent through the Q57.1 thermal overload to the motor and
the upper motor turns at a reduced speed.
(b) 220 VAC is sent through the Q57.2 thermal overload to the motor and
the lower motor turns at a reduced speed.
◊ The normally closed auxiliary contacts of K57 open preventing the K55
and K56 contactors from energizing.
• For the first 2 minutes 220 VAC is sent from terminal 4 on connector X11
through the normally closed auxiliary contacts of contactor K5 to the K50
contactor coil
◊ K50 contactor closes and the motor turns CW
◊ The normally closed auxiliary contacts on K50 open preventing the K5
contactor from energizing.
• For 15 seconds the motor is de-energized and allowed to coast.