Electrolux EOG621B User manual

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SERVICE MANUAL
COOKING
DRAFT COPY
© ELECTROLUX ZANUSSI S.p.A.
Corso Lino Zanussi,30
Publication No.
I - 33080 PORCIA /PN (ITALY) 599 34 41-93
Tel [phone]
Fax [phone]
TSE-P
Edition: 10.2000
EN/SERVICE/FV
GAS OVEN
WITH
ELECTRONIC
CONTROL
EOG621B
EOG621W

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GENERAL WARNINGS
For proper functioning and for safety purposes it is necessary that this type of oven be installed properly (see
installation in the Instruction booklet extract, page 19) by competent and qualified installers, according to
local legislation.
It is extremely important not to obstruct the air circulation necessary for correct burner combustion.
This oven can function with several types of gas:
before installing the oven it is necessary to check that the burner injector is suitable for the type of gas (see
table on page 23) otherwise it is necessary to replace the burner nozzle (see adaptation of the burner to
various types of gas on page 23)

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INDEX
INTRODUCTION ------------------------------------------------------------------------------------------ page 4
TECHNICAL FEATURES ------------------------------------------------------------------------------- page 4
CONTROL PANEL---------------------------------------------------------------------------------------- page 5
24 HOUR CLOCK AND TIMER------------------------------------------------------------------------ page 6
GENERAL DESCRIPTION------------------------------------------------------------------------------ page 8
FUNCTIONAL DESCRIPTION------------------------------------------------------------------------- page 8
SPARK PLUG / FLAME DETECTOR GAPS ------------------------------------------------------- page 9
GAS CIRCUIT---------------------------------------------------------------------------------------------- page 9
GAS CIRCUIT DIAGRAM ------------------------------------------------------------------------------- page 10
SOLENOID VALVE --------------------------------------------------------------------------------------- page 11
CONTROL CIRCUIT AND CONTROL UNIT ------------------------------------------------------- page 12
GAS BURNER CONTROL CIRCUIT ----------------------------------------------------------------- page 12
SIMPLIFIED DIAGRAM OF CONTROL UNIT CONNECTIONS------------------------------- page 13
SAFETY THERMOSTAT -------------------------------------------------------------------------------- page 14
ELECTRONIC CONTROL UNIT TEST CIRCUIT ------------------------------------------------- page 15
FUNCTIONAL DIAGRAM OF THE TEST CIRCUIT ---------------------------------------------- page 17
GAS SECTION TROUBLESHOOTING-------------------------------------------------------------- page 18
INSTRUCTIONS FOR THE INSTALLER ----------------------------------------------------------- page 19
IMPORTANT SAFETY REQUIREMENTS ---------------------------------------------------------- page 20
BUILDING IN ----------------------------------------------------------------------------------------------- page 21
ELECTRICAL CONNECTION ------------------------------------------------------------------------- page 22
CONVERSION FROM NATURAL TO LPG GAS-------------------------------------------------- page 23
ACCESSIBILITY------------------------------------------------------------------------------------------- page 24
- Extraction of the oven-------------------------------------------------------------------------- page 24
- Disconnection of the oven gas --------------------------------------------------------------- page 25
- Removal of the control panel----------------------------------------------------------------- page 25
- Disassembly of the control panel------------------------------------------------------------ page 26
- Access to the electronic control unit and the control components ------------------ page 26
- Disassembly of the rear panel --------------------------------------------------------------- page 27
- Disassembly of the ignition transformer, spit motor and grill heater ---------------- page 27
- Disassembly of the top panel ---------------------------------------------------------------- page 29
- Disassembly of the oven lamp and lampholder------------------------------------------ page 29
- Disassembly of the tangential cooling fan------------------------------------------------- page 30
- Disassembly of the gas solenoid valve ---------------------------------------------------- page 31
- Disassembly of the safety thermostat and protection thermostat ------------------- page 32
- Removal of oven bottom ---------------------------------------------------------------------- page 32
- Access to the oven burner and the spark-plug/flame detector ----------------------- page 33
BASIC DIAGRAM ----------------------------------------------------------------------------------------- page 36
WIRING DIAGRAM --------------------------------------------------------------------------------------- page 37
WIRING DIAGRAM LEGEND -------------------------------------------------------------------------- page 38

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INTRODUCTION
Each oven is thoroughly checked before leaving the factory in order to ensure correct operation and
compliance with the laws in force at the time of construction.
The safety of the oven depends also on proper installation and on the fact that the user understands how to
use the oven and keep it efficient.
For this purpose it is recommended that whoever uses the oven, first read the instructions for use in order to
obtain the best cooking results.
TECHNICAL FEATURES
GENERAL FEATURES
SUPPLY VOLTAGE V 230 (240)
POWER ABSORBED W 1800
DIMENSIONS (HxWxD) cm 59x60x54
TECHNICAL FEATURES
AUTOMATIC IGNITION: SI
PILOT LIGHTS NO./V 2/230
“GAS BLOCK” LED NO./mA 1/20
GAS SAFETY TYPE IONIZATION
PROGRAMMER
Type DIEHL 24H
OVEN ROTARY SWITCH
Positions NO. 4+0
GRILL HEATER
Power W 1750 (1800)
GAS BURNER TYPE with ionization control
SAFETY THERMOSTAT TYPE N.C.
Temperature °C 270
PROTECTION THERMOSTAT TYPE N.O.
Temperature °C 80
ADJUSTABLE THERMOSTAT
Temperature °C 50-250
OVEN LAMP NO. 1
Power W 25
SPIT MOTOR
Power W 4
COOLING FAN TYPE tangential
Power W 25
BURNER AND NOZZLE CHARACTERISTICS
TYPE OF GAS NOZZLE
1/100 mm
NOMINAL
POWER
kW
POWER
IN
m3/h g/h
GAS
NOMINAL
PRESSURE
(mbar)
MIN.
PRESSURE
mbar
MAX
PRESSURE
mbar
NATURAL GAS
(G20)
114 2,7 257 - 20 17 25
BUTANE
(G30)
78 2,5 - 180 30 20 35
PROPANE
(G31)
78 2,7 - 180 37 25 45

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CONTROL PANEL
Fig. 1
1 - Thermostat control knob 4 - Thermostat control Light
2 - Gas stop control Light (LED) 5 - Main “ON” Light
3 - Oven function control knob 6 - Electronic programmer
THERMOSTAT
Fig. 2
FUNCTION SELECTOR
Oven Light - The oven light will be on
without any cooking function.
Grill - The heat comes from the top
element only.
Grill and Rotisserie - The turnspit can be
used for either spit roasting meat or for
kebabs and smaller pieces of meat.
Bottom burner - The heat comes from the
bottom of the oven only.
Fig. 3

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24 HOUR CLOCK AND TIMER
Minute minder
Cooking duration
End of cooking time
Manual function
Saucepan symbol – This will be displayed when a
Program is in operation.
Auto symbol – This will be displayed when the
oven has been programmed for automatic
operation. Fig. 4
Time setting knob.
The electronic timer can indicate the time of day,
operate as a minute minder and automatically
operate the oven.
Before the oven can operated, the time of the day
must be set on the electronic timer.
Please note that this is a 24 hour clock. For example,
2pm is shown as 14:00.
In case of loss of power, all the settings (time of the
day, set program or program in operation), will be
cancelled. When the power is restored, the numbers
on the display will flash, and the timer must be reset.
TO SET THE TIME OF DAY
Press buttons and , and at the same time
turn the time setting knob until the correct time of the
day is displayed.
TO SET THE MINUTE MINDER
Press button and at the same time turn the time
selector knob until the duration time is displayed
(maximum 23 hours, 59 minutes).
Our diagram shows the timer set for 35 minutes.
After a few seconds the time of day will show in the
display.
To check the number of minutes remaining, press
the button. At the end of the timed period an
alarm will sound. To switch off the alarm press
button .
Fig. 5
Fig. 6

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MANUAL OPERATION
Press button to set the oven to manual operation.
TO SET THE TIMER TO SWITCH OFF ONLY
This is useful if you want to begin cooking
immediately but have the oven switch off
automatically.
1 . Set the oven function control knob and the
thermostat control knob to the required settings.
2 . Place food in the oven.
3 . Press button and, at the same time, turn the
time setting knob until the required cooking
duration is displayed.
Our diagram shows the timer set for 1 hour 10
minutes. At the end of the cooking time the oven will
switch off and an alarm will sound. Turn the oven
function and thermostat control knob to zero. To
switch off the alarm press button .
TO SET THE TIMER TO SWITCH THE OVEN
ON AND OFF
1 . Ensure the clock is showing the right time of day.
2 . Carry out steps 1, 2 and 3 as explained in “To set
the timer to switch off only”.
3 . Press button and at the same time turn the
time setting knob until the end cooking time is
displayed.
Our diagram shows the end cooking time set
for 7:35 p.m.
At the end of the cooking time turn the oven function
and thermostat control knob to zero.
TO CANCEL A PROGRAMME
1 . Press button and, at the same time turn the
time setting knob until the end cooking time is set
to “zero”.
2 . If the cooking time has been set too, press button
and at the same time turn the time setting
knob until the end cooking time in set to “zero”.
Fig. 7
Fig. 8
Fig. 9

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GENERAL DESCRIPTION
The two models - EOG621B and EOG621W - differ only as regards their styling (colours).
Both models are designed for the following types of cooking:
- Normal gas cooking.
- Electric grill cooking.
- Electric grill plus spit cooking.
Normal gas cooking is provided by means of a burner controlled by an electronic control unit with an
automatic ignition system with solenoid valve. The entire system is controlled by an ionic detection probe.
Grill cooking is provided by an electric 2000 W heating element controlled by an adjustable thermostat with
the addition of the spit if desired.
FUNCTIONAL DESCRIPTION
The main feature of this gas oven is that the burner operates intermittently. The burner operates at the
maximum level until the oven has reached the temperature selected using the thermostat. The oven then
switches off until the temperature falls to about 15°C below the selected temperature, when the burner is
switched on again. In other words, the oven switches on and off automatically to maintain the temperature at
or near the level selected using the thermostat.
This intermittent system of operation makes it possible to maintain the temperature inside the oven
significantly lower than in conventional gas ovens controlled by a modulating gas thermostat.
This type of oven also offers excellent performance in sterilizing and defrosting foods.
The system consists of a thermostat which controls an electronic board (PCB); the PCB actions the gas
control solenoid and the igniter.
When the function control knob is rotated to the gas cooking position, and when the thermostat knob is set to
a given position, the control unit actions the solenoid which opens the gas supply and, at the same time,
powers the transformer which lights the burner.
The system is controlled by the ignition spark plug, which also acts as an ionization sensor fitted to the
burner; in the event that the flame is extinguished for any reason, this information (lack of ionization, i.e. no
current circulation through the sensor) is transmitted to the control unit which first attempts to re-light the
burner. If this fails, the control unit actions the solenoid to interrupt the gas supply and transmits a signal
which lights the red "gas block" LED.

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SPARK PLUG / FLAME DETECTOR GAPS
In order to assure that the system functions correctly, the ignition spark plug and flame detector must be
correctly positioned.
The ignition spark plug/flame detector is secured by a rigid bracket in a precisely-determined position. If the
spark plug is bent or incorrectly positioned, this will alter the gap and may result in incorrect operation.
To ensure correct operation, proceed as follows:
The ignition spark plug/flame detector must be positioned at a distance of 3.75 mm (+0.25 -0.10) from the
burner. If the gap is different, it is necessary to replace the spark plug support.
Fig. 10
1 - IGNITION SPARK PLUG/FLAME DETECTOR
2 - OVEN BURNER
3 - SPARK PLUG SUPPORT
GAS CIRCUIT
The gas is ducted to the burner by a special solenoid valve which is actioned by the electronic control unit.
The gas passes from the coupling, through the ramp to the solenoid valve.
From the solenoid valve, the gas passes through the corresponding coupling to the nozzle fitted to the
burner (see fig. 6, page 8).
This type of oven is fitted with normally-closed valves (see fig. 7, page 9).
The solenoid must be energized in order to open the gas supply.
The solenoid is powered by direct current in order to prevent vibration inside the solenoid valve; the
electronic control unit governs the operation of the solenoid valve (see fig. 12, page 10).

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GAS CIRCUIT DIAGRAM
Fig. 11

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SOLENOID VALVE
The solenoid valve which controls the flow of gas to the burner is powered by direct current and actioned by
the electronic control unit. If the gas supply should be interrupted (the gas solenoid valve does not open),
check that the electronic control unit supplies the correct voltage to the solenoid valve. If the voltage at pins 7
and 8of the control unit or at the solenoid valve itself (see fig. 8) is 208V DC (+10% -15%), but the valve fails
to open the gas supply, it is necessary to check the solenoid valve.
To check the solenoid valve, measure the resistance of the control solenoid using a multimeter set to the
ohm scale (with the appliance switched off). It is not necessary to disconnect the wires from pins 7and 8on
the control unit. The resistance must be approximately 13 Kohm.
If this measurement is correct (possible mechanical problem), replace the solenoid valve.
Fig. 12
1 - GAS OUTLET
2 - GAS INLET
3 - ELECTRICAL CONNECTORS
4 - SOLENOID
Fig. 13
1 – MULTIMETER (OHM SCALE)
2 – GAS SOLENOID VALVE

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CONTROL CIRCUIT AND CONTROL UNIT
The control circuit for the burner consists of an electronic control unit which is actioned by the oven
thermostat and the function selector knob.
The electronic control unit controls the flow of gas by means of the solenoid valve positioned at the gas
intake. This solenoid valve is of the open-closed type.
The electronic control unit, together with the ionization sensor and the solenoid valve, constitutes an
automatic flame control safety system.
This system consists of a sensor which detects the flow of ions generated by the flame when lit, in an
electronic circuit fitted in the control unit, and a solenoid valve which cuts off the flow of gas if necessary.
When the oven thermostat control knob is turned (if the selector knob is set to the gas oven function ), the
thermostat powers the control circuit inside the electronic control unit.
First, the system checks for the presence of a flame. If no flame is present, the gas control solenoid actions
the ignition procedure, checks the ignition for a short time (about 10 seconds) and then switches off the
ignition function. During normal operation, only the presence of a flame is checked. If the flame should for
any reason be extinguished, the flow of gas is interrupted and the "gas block" pilot lamp lights.
GAS BURNER CONTROL CIRCUIT
Fig. 14

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SIMPLIFIED DIAGRAM OF CONTROL UNIT CONNECTIONS
KEY
C1 IGNITION SPARK PLUG/FLAME DETECTOR
CE1 ELECTRONIC CONTROL UNIT
EV1 GAS CONTROL SOLENOID VALVE
LED “GAS BLOCK” LED
LF1 SUPPRESSOR
SG1 SPARK GENERATOR
Tb TERMINAL BLOCK
TM ENERGY REGULATOR

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SAFETY THERMOSTAT
The entire electrical circuit of the oven is protected against overheating by a normally-closed ceramic
thermostat (see fig. 15) which opens at a temperature of 270°C in the centre of the oven.
The main cause for intervention of the safety thermostat is generally a malfunction of the tangential fan;
however, the thermostat may also intervene if the appliance is not correctly built in.
Fig. 15
Fig. 16
1 - SAFETY THERMOSTAT
2 - ELECTRICAL CONNECTION TO GRILL HEATING ELEMENT
3 - PROTECTION THERMOSTAT (TANGENTIAL FAN OPERATION)

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ELECTRONIC CONTROL UNIT TEST CIRCUIT
In case of doubt concerning the operation of the electronic control unit, use the test circuit shown below (figg.
17 and 18).
This circuit should feature a switch with a built-in neon pilot lamp, a series of 220V neon pilot lamps
indicating “appliance ON”, “gas valve open” and “gas to energy regulator”, a LED (part number 357 00 31
07/4) which lights when the electronic control unit is blocked, and a rectifier diode (any silicon rectifier diode
can be used, for example type 1N4004 or similar with an inverse voltage of at least 400V) which simulates
the passage of a current equivalent to that produced by the presence of a flame through a 10 kOhm 1/2 Ohm
limiting resistor connected in series.
Fig. 17
CE ELECTRONIC CONTROL UNIT BEING TESTED
CP TEST CIRCUIT
D1 SILICON RECTIFIER DIODE (e.g. 1N4004)
R1 LIMITING RESISTOR (10 kΩ=1/2 Ω)
LED1 “GAS BLOCK” LED (part number 357 00 31 07/4)
SW1 MAIN SWITCH WITH BUILT-IN PILOT LAMP
SW2 IONIZATION SWITCH
SP1 MAIN PILOT LAMP
SP2 “GAS VALVE OPEN” PILOT LAMP
SP3 “IGNITION” PILOT LAMP
SP4 “GAS TO ENERGY REGULATOR” PILOT LAMP

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Fig. 18
1 - TEST CIRCUIT CP
2 - MAIN SWITCH SW1
3 - IONIZATION SWITCH SW2
4 - “GAS BLOCK” PILOT LAMP LED1
5 - “GAS VALVE OPEN” PILOT LAMP SP2
6 - “IGNITION” PILOT LAMP SP3
7 - “GAS TO ENERGY REGULATOR” PILOT LAMP
8 - ELECTRONIC CONTROL UNIT BEING TESTED CE
9 - 10-PIN CONNECTOR
The circuit illustrated above can be used to check that the electronic control unit operates in the correct
sequence.
CORRECT OPERATION
1. Connect the wiring to the control unit as shown in fig. 18.
2. Connect the test circuit to the power supply.
3. Close the main switch (2). The pilot lamp built into the switch lights to indicate that the control unit is
powered.
4. After about 5 seconds, the “GAS VALVE OPEN” pilot lamp (6) and the “ON” pilot lamp (5) light.
5. Close the ionization switch (3) (this simulates lighting of the burner by applying an inverse current which
circulates in the diode on terminal 1 of the control unit). The switch should be closed within 10 seconds.
At this point, the “GAS VALVE OPEN” pilot lamp (6) should remain lit and the “ON” pilot lamp should
switch off.
6. If the ionization switch (3) is not closed within 10 seconds, the “IGNITION” LED (5) and the “GAS
VALVE OPEN” LED (6) will switch off, while the “GAS BLOCK” LED (4) will light.

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FUNCTIONAL DIAGRAM OF THE TEST CIRCUIT
Fig. 19
Fig. 20
TIMES
T1) The control unit performs an internal check
T2) The burner must switch on within this period
T3) Normal operation of the burner
I1) Moment at which the burner lights
I2) Moment at which the control unit blockage occurs

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GAS SECTION TROUBLESHOOTING
ACTION WHAT HAPPENS? CHECK.......
Turn the
function selector
knob on the gas
oven to ,
and turn the
thermostat knob
to any
temperature.
The pilot lamp indicating
that the thermostat is in
operation does not light.
- the power supply
- the safety Klixon
- closure of the programmer contacts
- closure of the function selector contacts
(P1-1 and P2-4)
- the adjustable thermostat
- the thermostat pilot lamp
When the gas delivery
solenoid opens, a “click”
is heard; the ignition
spark, too is heard and,
after about ten seconds,
a “click” is heard when
the gas delivery solenoid
closes; the “GAS
BLOCK” LED lights.
- the gas supply
- the gas pressure (especially if LPG is
used, check whether the dynamic
pressure is less than 200 column mm,
which might cause problems of ignition).
- that there is no discharge between the
wiring to the spark plug and earth
- the position of the spark plug/flame
detector (which should be 3.75 mm from
the burner – see page 9)
- that the ignition spark plug/flame
detector is not oxidized
- replace the electronic control unit
When the gas delivery
solenoid opens, a “click”
is heard; the ignition
spark is not heard and,
after about ten seconds,
a “click” is heard when
the gas delivery solenoid
closes; the “GAS
BLOCK” LED lights.
- check the ignition spark plug
- check the igniter wiring for possible
discharge from the wiring to earth
- replace the igniter
Only the ignition spark
“click” is heard; after
about ten seconds, the
“GAS BLOCK” LED for
the corresponding burner
lights.
- the wiring to the solenoid valve
- the solenoid valve
- replace the electronic control unit (see
tests described on page 16)
The thermostat pilot
lamp lights, but neither
the solenoid valve “click”
nor the the ignition spark
“click” is heard; after
about ten seconds, the
“GAS BLOCK” LED
lights.
- replace the electronic control unit (see
tests described on page 16)

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INSTRUCTIONS FOR THE INSTALLER
TECHNICAL DATA
Model Number : EOG 621
APPLIANCE GAS SUPPLY: Natural Gas G20 20 mbar
APPLIANCE CATEGORY: II2H3+
CABINET DIMENSIONS
Minimum aperture (height) 580 mm
Minimum aperture (depth) 550 mm
Minimum aperture (width) 560 mm
OVEN
Grill Element 1,830 W
Oven burner 2,700 W (Natural gas)
2,500 W (LPG)
Oven light 25 W
Cooling fan 25 W
Turnspit motor 4 W
Total rating 1,880 W
Supply voltage (50 Hz) 230–240 V

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IMPORTANT SAFETY REQUIREMENTS
This appliance must be installed in accordance with the Gas Safety (Installation and Use) Regulations
(current edition) and the I.E.E. Wiring Regulations. Detailed recommendations are contained in the following
British Standard Codes of practice – B.S.6172, B.S.5440: Part 2 and B.S.6891: Current Editions.
PROVISION FOR VENTILATION
This appliance is not connected to a combustion products evacuation device. It must be installed and
connected in accordance with the current installation regulations. Particular attention must be be given to the
relevant requirements regarding ventilation.
The room containing the appliance should have an air supply in accordance with BS. 5440: Part 2 Current
Edition. All rooms must feature an openable window. For room volumes up to 5 m3an air vent with a section
of 100 cm2is required; for room volumes between 5 m3and 10 m3 , an air vent with a minimum area of 50
cm3is required. If the room has a door which opens directly to the outside, no air vent is required. For room
volumes that exceed 11 m3no air vent is required.
If there are other fuel burning appliance in the same room, B.S. 5440: Part. 2: Current Editions should be
consulted to determine the appropriate air vent requirements.
Prolonged or intensive use of the appliance may require additional ventilation, for example opening a
window, or more effective ventilation, or increasing the level of mechanical ventilation where present.