Cleveland Convotherm Combination Oven-Steamer Gas 20.20 Service And Parts Manual page 71

• If the bypass probe (B5) drops below the set level the steam circuit will start
again.
e When the condensate box is heated to 140 degrees F at the B3probe, 120 VAC is
sent from terminal 5 of connector X12 to the condenser valve (Y1) until the
temperature drops.
f If the "Crisp and Tasty" mode is selected
• 120 VAC is sent from terminal 6 of connector X12 on the Control Board
(A10) to the Dehumidification Valve (Y2) to pull the humidity out of the
cabinet down the drain.
◊ In the light and medium modes (one and two drops in the display) the Y2
valve will be energized until the bypass probe (B5) is satisfied.
◊ In the full mode (3 drops in the display) the Y2 valve will be energized
continuously.
g When the timer counts to 0 or the core temp probe (B10) reaches the set amount
the cycle ends and the steam generator reverts to the standby temperature of 190-
degree F.
7 With the combi in the Rethermalization 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 Retherm 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 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)
c The Gas board (A20) Transmits a signal from terminal 4 of connector X26 to the
Motor Drive.
• The motor Drive Board sends a signal through the thermal switch in the motor
from Terminal 5 and receives on terminal 6
• If the thermal switch is not open the Motor Drive Board (U10) sends 220
VAC 3 phase to the motor.
• The motor reverses direction every 120 seconds with a 15 second coast.
• NOTE: If the set 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).
d Hot air heat circuit is energized
• A signal is sent from terminal 8 of connector X15 on the Control Board (A10)
to terminal 4 of connector X2 on the Hot Air Power Burner and Fan Control
(U20) selecting the set speed of the combustion blower.
◊ When this speed is attained the signal is sent from terminal 2 of connector
X2 on the Hot Air Power Burner and Fan Control (U20) to terminal 2 of
connector X15 on the Control Board (A10)
• A request for heat is sent from terminal 3 of connector X12 on the Control
Board (A10) to terminal 10 on connector X1 on the Hot Air Control Module
(N20)
◊ 24 VAC is sent from terminal 2 of connector X2 on the Hot Air Control
Module (N20) to the hot surface igniter (R20).