Cleveland Convotherm Combination Oven-Steamer Gas 20.20 Service And Parts Manual page 56

• 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 by the Control Board (A10) transmitting and
receiving a signal from terminals 5,6,7 and 8 on connector X10 to terminals 3,4,5
and 6 of connector X28 on the Gas Board (A20)
• The Gas board (A20) Transmits a signal from terminal 4 of connector X26 to
terminal 2 of connector X12 the Motor Drive (U10)
◊ 220 VAC 3 phase is sent from the Motor board to the Oven Fan motor
(M1)
◊ Every 120 seconds the rotation of the motor reverses.
◊ 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)
and the bypass probe (B5) are satisfied.