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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION
Page 45 of 68
Programable Oven Control
This sequence of operation is written for the combi
oven models that use the programable oven control.
The three heating modes outlined below
(convection, steam and combi) are for manual
operation of the oven. The automatic cooking
methods (timed, temperature probe and delta t) are
then outlined.
Powering Control
1. Conditions.
A. Oven connected to correct voltage supply
and properly grounded.
B. Oven control (CPU/display board) are
powered but not on; displays and LED’s
are off.
NOTE
: When oven is initially powered, the
buzzer sounds and the displays, LED’s and
service error lights come on for several
seconds then turn off.
C. Oven control configured properly. See
“CONFIGURATION MODE -
PROGRAMMABLE CONTROL” outlined
under “SERVICE PROCEDURES AND
ADJUSTMENTS”.
D. Voltage tap wire on power supply board
set to the proper machine voltage.
E. Door is properly closed but not locked and
the door handle position is closed.
1) Door handle magnet is positioned
over magnetic door reed switch
(N.O.) and is closed.
F. High limit thermostats closed (manual
reset).
G. Thermal fuses closed.
H. Cavity vent open.
I. 240VAC supplied to relay board.
J. Steam generator empty.
K. Water supply on.
2. Press the On key.
A. Oven control runs a self diagnostic test.
1) “HHH” is displayed in the time
display.
2) Total cooking hours is displayed in
the temperature display.
3. Control passes self diagnostic test.
A. Cavity temperature is displayed.
B. Time displays “-
h
- -
min
”.
C. Oven cavity lamp energized.
D. Cooling fan(s) energized.
E. Cavity vent motor energized.
1) Cavity vent closes.
NOTE
: When the oven is turned on, the
default condition of the cavity vent is
closed. Pressing the Hot Air key selects
the Hot Air mode and the Hot Air/Vent
closed LED is on. Press the Hot Air key a
second time to open the vent. The Hot air
mode is still selected but the vent closed
LED goes out and vent open (lower) LED
turns on. Press the Hot Air/Vent key a third
time to return to initial power on
conditions.
F. Door motor energized.
1) Door opens (sightly) for several
seconds then closes and locks.
NOTE
: Pressing the ON key automatically
unlatches and opens the door (sightly) for
3 seconds. If door is not disengaged
manually (door handle pulled out), it will
automatically close. While open, all
heating stops and the cavity vent opens.
a. When the door is locked, switch
2SW closes and door motor is
de-energized. On 20 levels only,
switch 6SW also closes.
b. Switch 3SW opens. On 20 levels
only, switch 5SW also opens.
4. Proceed to the appropriate heating mode
(convection, combi or steam) for the
continuation of the sequence.
Convection Mode
1. Conditions exist as described in “POWERING
CONTROL”.
2. Hot air key is pressed.
A. Hot Air/Vent closed LED on.
B. Time LED turns on and “-
h
- -
min
” is
displayed in the time display.
C. Cavity set point temperature (default) is
displayed in the temperature display then
reverts to the actual cavity temperature.
D. Steam generator fill solenoid is energized
until proper water level is reached then
turns off. See “WATER LEVEL
SENSORS” under “COMPONENT
FUNCTION”.
E. First LED for the cooking program phase
flashes.