•A request for heat is sent from terminal 3 of connector X21 on the Gas Board (A20) to terminal 10 on connector X1 on the Steam Burner Control Module (N21)
◊24 VAC is sent from terminal 2 of connector X2 on the Steam Burner Control Module (N21) 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 Steam Burner Control Module (N21) 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 11 of connector X25 on the Gas Board (A20).
•The heat circuit continues until both the cabinet set temperature and the bypass probe (B5) are satisfied
◊NOTE: If the set temperature is above 212 degrees F the hot air circuit will be energized (after the bypass probe is satisfied) until the
compartment setting is reached. The steam circuit always takes precedence.
dWhen the condensate box is heated to 140 degrees F at the B3 probe, 120 VAC is sent from terminal 5 of connector X12 to the condenser valve (Y1) until the temperature drops.
eWhen the timer counts to 0 or the core temp probe (B10) reaches the set amount the cycle send and the steam generator reverts to the standby temperature of 190 degrees F.
f
5With 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.
bThe 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)