R-9HlO
CONVECTION COOKING CONDITION
5. At the end of the convection cook cycle, shut-off
PREHEATING CONDITION
relay (RY4) is energized turning on the damper
Program desired convection temperature by touching
meotor. The damper is returned to the open position,
the CONVECTION pad and the temp. pad.
closing the damper switch contacts which send a
When the START pad is touched, the following oper-
signal to the control unit, de-energizing shut-off
ations occur:
relay (RY4).
1.
2.
3.
4.
The coil of shut-off relays (RYI, RY5 and RY6) are
energized, the oven lamp, cooling fan motor,
turntable motor and convection motor are turned
y:e coil of relay (RY4) is energized by the CPU
unit. The damper is moved to the closed position,
opening the damper switch contacts.
The opening of the damper switch contacts sends
a signal to the LSI on the CPU unit de-energizing
‘the relay (RY4) and opening the circuit to the
damper motor.
-.
The coil of heater relay (RY3) is energized by the
CPU unit and the main supply voltage is added to
the convection heater.
When the oven temperature reaches the selected
preheat temperature, the following operations oc-
cur:
4-1. The heater relay (RY3) is de-energized by
the CPU unit temperature circuit and
thermistor, opening the circuit to the con-
vection heater.
4-2. The oven will continue to function for 15
minutes, turning the convection heater on
and off, as needed to maintain the selected
preheat temperature.
The oven will shut-down completely after
15 minutes.
CONVECTION COOKING CONDITION
When the preheat temperature is reached, a beep signal
will sound indicating that the holding temperature has
been reached in the oven cavity. Open the door and
place the food to be cooked in the oven.
Program desired cooking time and convection temper-
ature by touching the number pad, CONVECTION pad
and Temperature pad.
When the START pad is touched, the following oper-
ations occur:
1.
2.
3.
4.
The numbers of the digital readout start the count
down to zero.
The oven lamp, turntable motor, cooling fan motor
and convection motor are energized.
Heater relay (RY3) is energized (if the cavity tem-
perature is lower than the selected temperature)
and the main supply voltage is applied to the con-
vection heater to return to the selected cooking
temperature.
Upon completion of the cooking time, the audible
signal will sound, and oven lamp, turntable motor,
cooling fan motor and convection motor are
de-energized. At the end of the convection cycle,
if the cavity air temperature is above 90 ‘C., the
circuit to RY6 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan
motor until the temperature drops below 90 “C., at
which time the relay will be de-energized, turning
off the fan motor. Relay RY5 will however, open
as soon as the convection cycle has ended, turning
off the convection fan motor.This will now cool
and aNow the damper door to open.
AUTOMATIC MIX COOKING CONDITION
Program desired cooking time and temperature by
touching the number pads and the LOW MIX/BAKE
or HIGH MIX/ROAST pad
When the START pad is touched, the following oper-
ations occur:
1.
2.
3.
4.
5.
6.
The numbers of the digital readout start the count
down to zero.
The shut-off relay (RYI, RY5 and RY6) are ener-
gized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor.
The shut-off relay (RY4) is energized.
The damper door is closed from the open position.
The heater relay (RY3) is energized, adding the
mains supply voltage to the convection heater.
Now, the oven is in the convection cooking con-
dition.
When the oven temperature reaches the selected
temperature, the following operations occur:
6-l. The power supply voltages is added to the
convection heater and power transformer al-
ternately.
6-2. The convection heater operates through the
heater relay (RY3) contacts and the power
transformer operates through the cook relay
(RY2) contacts.
6-3. These are operated by the CPU unit to sup-
ply alternately within a 32 second time base,
convection heat and microwave energy.
The relationship between the convection and micro-
wave power operations are as follows.
Note: The ON and OFF time ratio does not correspond
with the percentage of microwave power, be-
cause approx. 2 seconds are needed for heating
of the magnetron filament.
(MICRO.1 OFF
I
I
I
I
!
‘ON
I
I
OFF
LOWMIX’
BAKE
MICROWAVE POWER
- Approx. 10%
CONVECTION
TEMPERATURE
- lao°C
- Approx. 30%
CONVECTlOU
TEMPERATURE
ICONVECJ
- 2oo”c
I
32 sac.
t=
HIGH MIX
--
ROAST
5
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