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)
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 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).
d
The steam generator heat circuit is energized
•
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)
•
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 by pass probe is satisfied) until the
compartment setting is reached. The steam circuit always takes
precedence.
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
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.
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