Cleveland Range Convotherm Combination Oven-Steamer Gas 20.20 User Manual

Page 69

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.

The fan circuit is energized by the Control Board (A10) transmitting and

receiving a signal from terminals 5,6, and 7 on connector X10 to connector X12
on the Motor Drive Board (U10).
• 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 240

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).

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).

◊

The gas valve is energized allowing gas and air into the burner chamber to

be ignited by the hot surface igniter.

◊

The Hot Air Burner Control Module (N20) senses at least 1.5 micro amps

DC from the flame sensor (P1) at terminal 3 of connector X2 and sends a
signal from terminal 2 of connector X1 to terminal 12 of connector X15
on the Control Board (A10)

• The heat circuit will remain energized until the cabinet set temperature is

reached as sensed at probe B6.

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.

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.