Cleveland Range Convotherm Combination Oven-Steamer Gas 20.20 User Manual
Page 52
(b)
24 VAC is sent from terminal 2 of connector X2 on the Steam Burner
Control Module (N21) to the hot surface igniter (R20).
(c)
The gas valve is energized allowing gas and air into the burner
chamber to be ignited by the hot surface igniter.
(d)
The Steam Burner Control Module (N21) senses between 0.5 and 4.0
micro-amps DC from the flame sensor (P1) at terminal 3 of connector
X2 (within 4 seconds) and sends a signal from terminal 2 of connector
X1 to terminal 11 of connector X25 on the Gas Board (A20)
• The steam generator heat circuit continues until 190 degrees F is detected
from the Steam Generator probe (B4) at terminals 1 and 2 of connector X17
on the Control Board (A10)
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 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 3 of connector X26 to
terminal 3 of connector X12 the Upper Motor Drive (U10.1)
◊
240 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.
• The Gas board (A20) Transmits a signal from terminal 7 of connector X26 to
terminal 3 of connector X12 the Lower Motor Drive (U10.1)
◊
240 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.
c
The steam generator heat circuit is energized after the signal is received from the
motor board that the blower motor is turning
• A signal is sent from terminal 8 of connector X24 on the Gas Board (A20) to
terminal 4 of connector X2 on the Steam Power Burner and Fan Control
(U21) 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 Steam Power Burner and Fan Control (U21) to terminal 9 of
connector X24 on the Gas Board (A20)