Electrolux AOS202EAMQ (260818) Service Manual
Electrolux AOS202EAMQ (260818) is a professional-grade oven designed for commercial kitchens. It offers advanced features and capabilities that make it a versatile and efficient choice for high-volume cooking operations. With its intuitive user interface, extensive programming options, and advanced safety features, the Electrolux AOS202EAMQ (260818) oven empowers chefs to achieve consistent, high-quality results every time they cook.
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AOS_Q OVENS – Service Manual
(593802300 - ENG)
AOS NXT (AOS_Q) OVENS
- Service manual -
CONTENTS: This document contains the information about parameters that can be read and/or modified by means of user interface, service utilities, ....
PROJECT REF:
AUTHORS:
CONTRIBUTION BY:
DOCUMENT HISTORY:
AOS NXT ovens
S. Gant
F. Ornella A. Canova
Rel. Date: File: Author:
00 01/08/2007 AOS NXT service manual (ENG).00 S. Gant
Note:
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INDEX
1 Programming the default parameters .......................................................................................4
2 Advanced programming .............................................................................................................5
3 By-pass calibration (only for lev. B ovens)...............................................................................6
4 Lambda probe calibration (only for lev. A ovens) ....................................................................7
5 Cavity offset calibration (only for lev. A ovens) .......................................................................7
6 Error codes ..................................................................................................................................8
6.1
Errors.....................................................................................................................................8
6.2
Warnings ...............................................................................................................................8
7 Firmware release .........................................................................................................................9
8 Working temperatures ................................................................................................................9
9 Service utilities ............................................................................................................................9
9.1
Utilities that can be activated with oven switched on.......................................................9
9.2
Utilities that can be activated in parameter programming .............................................10
10 Selection of the language for the recipe menu (lev. A) .........................................................11
11 Cleaning cycles (lev. A) ............................................................................................................11
12 Cycles, utilities, important parameters ...................................................................................11
13 Gas system ................................................................................................................................13
13.1
Gas valve...........................................................................................................................15
13.2
Offeset pressure calibration............................................................................................16
13.3
Use of manometer (for offset pressure measure) .........................................................17
14 Change of the microprocessor board .....................................................................................18
APPENDIX A – WATER BOILING POINT ......................................................................................19
APPENDIX B – CONTACTORS DIAGRAM ...................................................................................20
APPENDIX C – CONNECTIONS ON MAIN BOARD......................................................................21
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APPENDIX D – LAMBDA PROBE..................................................................................................24
APPENDIX E – PARAMETER DESCRIPTIONS ............................................................................25
APPENDIX F – WATER TREATMENT ...........................................................................................27
APPENDIX G – CONNECTION TO HACCP SYSTEM ...................................................................29
APPENDIX H – RELAY DESCRIPTIONS .......................................................................................30
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1 Programming the default parameters
Fig. 1
Switch on the oven (fig. 1).
Fig. 2 Fig. 3
Just after the switching on, a lamp test will take place (fig 2).
At this point, during the lamp test phase, press the external service buttons (fig.3) till you hear a beep.
1
1
Fig. 4 Fig. 5
At this point press the right buttons till you hear a beep (fig. 4).
1
Fig. 6
1 2
Press then the left service buttons till the beep (fig. 5).
At this point release the left buttons keeping pressed the middle one (fig. 6) till you hear 2 beeps.
Release the middle button and on the temperature display you will see “PdEF”: the oven will switch off and on automatically.
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2 Advanced programming
Fig. 7 Fig. 8 Fig. 9
The procedure to enter in advanced programming is similar to the procedure for programming the defaults parameters.
Switch on the oven (fig. 7).
Just after the switching on, a lamp test will take place (fig. 8).
At this point, during the lamp test, press the external service buttons (fig.9) till you hear a beep.
1
1
1
Fig. 10 Fig. 11
At this point press the right buttons till you hear a beep (fig. 10).
Press then the left service buttons till the beep (fig. 11).
Release the button and on the temperature display you will see “P 1” while on the little display the name of the parameter will appear (fig. 12).
With the external service buttons it is possible to scroll the list of the parameters.
Pressing the middle button it is possible to see the value of the parameter (fig. 13) and pressing at this point the external buttons it is possible to modify the value. Press again the middle button returning to the displaying of the number of the parameter to store the new value.
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Switch off the oven to exit from programming.
Fig. 12
3 By-pass calibration (only for lev. B ovens)
Fig. 13
In order to calibrate the by-pass probe on lev. B ovens, follow these steps:
1) Switch on the oven
2) Enter in parameter programming and set parameters cort and OCA1 to 0
3) Exit from programming and switch on again the oven
4) Wait for the end of the pre-heating cycle
5) Select a steam cycle (100 °C)
6) Select continuous time (indication “cont” on time display)
7) Press and hold down the left service buttons and at the same time press the START button (fig. 14); the oven will give a long beep
8) Release the service buttons and wait for the stabilization of the temperature reading by the by-pass probe
9) When the temperature has stabilized, press the three service button together in order to memorize the value (fig. 15); the oven will confirm the storing with a long beep
10) Allow the oven to work for several minutes in steam mode checking the oven cavity temperature, which should stabilize at the water boiling point. If this reading is greater or less than the correct water boiling point
TPF
1
FPT
, a corrective value can be stored in the parameter OCA1 . Pushing the 3 service buttons to store the bypass temperature, the microprocessor will calculate and store also the value of OCA1 .
11) Set parameter cort to 1.
1
See Appendix A
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12) Set the altitude above sea level of the site on parameter SEAL
Fig. 14
Fig. 15
4 Lambda probe calibration (only for lev. A ovens)
The calibration of the lambda probe is necessary for the right working of the oven in case of cycle with set point under 100 °C. With this procedure we have to find the point of 0% of humidity.
The procedure is done in a way similar to the by-pass calibration. These are the steps:
1) Set an hot air cycle, 150 °C, time over 15 minutes, open flap;
2) Start the cycle pressing together the left and middle service buttons and the START button. The oven will give a long beep;
3) Wait around 10-15 minutes to dry completely the cavity;
4) Close the flap and wait around 20 seconds to stabilize the humidity inside the cavity;
5) To store the value press together the 3 service buttons. The oven will confirm with a long beep.
6) Stop the cycle with the START button.
This calibration is very important and has to be done with care. If the dry point (0% of humidity) is not correctly stored, the reading of the relative humidity could be overestimated or underestimated.
5 Cavity offset calibration (only for lev. A ovens)
In order to adjust the offset of the cavity probe, enter in parameter programming and set parameters cort and OCA1 to 0.
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Then run a steam cycle for several minutes and check the cavity temperature, which should stabilize at the
After this, set parameter cort to 1and set parameter SEAL (altitude above sea level).
Errors can be divided into 2 categories: errors (they stop the appliance) and warnings (they do not stop the appliance).
6.1 Errors
EE2P : Communication error with the EEPROM
E ---: If the controller detects one or more parameters which have values not permitting the minimum operational requirements, an error code will appear on the display, i.e. “E---” followed by the parameter number. Enter the programming mode and set the correct value according to the parameter list.
EtUC : Cavity over temperature; cavity temperature exceeded value stored in parameter cot .
EtUB : Boiler over temperature; boiler temperature exceeded value stored in parameter bot .
EFUN : Activation of the thermal protection of the motor. On the little temperature display it will appear “UP” or “DOWN” according it is the thermal protection of the upper motor (and the motor of 6-10 grid ovens) or lower motor on 20-grid oven. The thermal protection has an automatic reset but in order to continue with the cooking process, parameter ALFn has to be reset to 0.
Etc : Tripping out of cavity limiter
Etb : Tripping out of boiler limiter
ESCH : Over temperature on the electronic board; check the cooling fan and the ventilation openings on the bottom of the control panel.
Ept1 : cavity probe in open circuit (only the steam cycle – 100 °C can be selected)
Ept2 : boiler probe in open circuit (only hot air cycle can be selected)
Ept3 : meat probe in open circuit (only time cooking can be selected)
Ept4 : by-pass probe in open circuit (only hot air, regeneration or low temperature steam cycle can be selected)
Ept8 : NTC probe in short or open circuit
ECAD : A/D converters not working
E PM : Communication error with PWM system
E SL : Water level probe error. If the boiler heating elements or burners are on for a tiem over that one defined in parameter tbon without a water charging phase, this error message is activated. To reset it, parameter ALFn has to be reset to 0. burn CAUP : Lockout of cavity burner (gas oven) (the upper one in the 20 grid ovens) burn CAdo : Lockout of lower cavity burner (gas oven) in 20 1/1 and 2/1 ovens burn boUP : Lockout of boiler burner (gas oven) (the upper one in 20 2/1 ovens) burn bodo : Lockout of lower boiler burner (gas oven)
6.2 Warnings
EH2O : Before the starting of the cleaning system and during its working, there are some check points of the water pressure. If the water pressure is too low this warning message appears on the display. Check the water pressure (1.5÷2.5 bar), check the correct working of the water pressure switch, check if there are obstructions on the cleaning water inlet pipe (its inner diameter must be 20 mm).
EFLP : Cavity ventilation flap failure; check the motoreducer or the micro switch that detects the close position of the flap. If the motoreducer does not close the flap within the time set in parameter FLto , EFLP error appears.
ECLO : Clock error, it appears if the clock was never adjusted
EPrG : Error in reading the phases of a multiphase recipe
EIND : Error in reading the index of the recipes
EDES : Error in reading the description of a recipe
ERAM : Communication error with the RAM nFIP : Communication error of recipe display
FILL : Safety level probe of the boiler out of water
PrEH : Preheating phase of the boiler; it indicates the preheating phase of the cavity if the warning message appears on temperature display.
2
See Appendix A
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OPEN : boiler drain activated
COOL : Cavity cooling phase dEt : low level of detergent rAI : low level of rinser rCLN : request for a cleaning cycle (manual or automatic); parameter FCLn is set to a value different from da 0.
LOAD : end of pre-heating phase of the cavity; if nothing is done, the cavity is maintained at the pre-heating set-point.
Strt : push START button. rES : reset procedure of the burners is activated
In order to check the version of the firmware, switch on the oven and wait for the lamp test and the end of the start-up phase (4 lines on the temperature display). When on the temperature display, the actual cavity temperature appears, pressing the three service buttons together on the display temperature the firmware version will appear. Pressing again these buttons, the board temperature will be displayed.
While the oven is working, it is possible to see the temperature of the several probes pressing the service buttons. See the following figures:
Fig. 16
Boiler temperature
“tbol” on the display
Fig. 17
By-pass temperature
“tbyp” on the display
Fig. 18
Meat probe temperature
“tPrb” on the display
Fig. 19
PCB temperature
“tntc” on the display
These utilities can be divided in 2 sets: utilities that can be activated with the oven switched on, utilities that can be activated with the oven in parameter programming
9.1 Utilities that can be activated with oven switched on
With the oven switched on and not in a cooking phase, pressing simultaneously the following buttons it is possible to activate the detergent, rinser pumps and water valve of the cleaning system:
•
Steam cycle, combi cycle, temperature buttons (fig. 20): activation of detergent pump
•
Steam cycle, combi cycle, time buttons (fig. 21): activation of rinser pump
•
Steam cycle, combi cycle, utility buttons (fig. 22): activation of water valve of the cleaning system
These routines are achievable only on lev. A ovens, i.e. with the parameter dCLn set to 0, closed door and cavity temperature less than 80 °C and with the oven not blocked with password.
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Fig. 20 Fig. 21
9.2 Utilities that can be activated in parameter programming
Fig. 22
•
Pressing the steam cycle and hot air cycle buttons, all the output relays are sequentially activated and on the time display it will be displayed the activated relay with the message do1 , do2 , ... ( dox = RLx on the EWD) o The steam cycle button acts as main switch: if it is released, the test stops. o Each time the hot air cycle button is pressed, the next relay is activated and remains activated till the next pressure of the hot air cycle button. o If the hot air cycle button is kept pressed, the relays are sequentially activated.
•
Pressing the time buttons, the time will be displayed
•
Pressing the utility button, on the time display a 4-characters message will be displayed while on the little display will be shown a number with the following meanings
Big display ntc
Prb1
Prb2
Prb3
Prb4
Prb5
Prb6
CEL1
CEL2 boL1 boL2 byP
Meaning of the number on the little display
PCB temperature
First meat probe temperature (lev. A)
Second meat probe temperature (lev. A)
Third meat probe temperature (lev. A)
Fourth meat probe temperature (lev. A)
Fifth meat probe temperature (lev. A)
Sixth meat probe temperature (lev. A)
First cavity temperature
Second cavity temperature
First boiler probe
Second boiler probe
Bypass probe
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Big display
Prb
HuM
Meaning of the number on the little display
Single-point meat probe (lev. B)
KS contactor is activated for 15 s and the lambda probe is fed and after a while the cavity humidity will be displayed
If one of the probes is detecting the same temperature of the ntc probe (PCB temperature), the meanings are the following:
1) Probe in short circuit
2) Probe not connected (for example Prb on a lev. A oven)
3) Probe at the same temperature of the ntc probe
•
If the led “open door” is switched on in parameter programming mode, it means that the safety level probe of the boiler is detecting water
•
If the led “scale alarm” is switched on in parameter programming mode, it means that the working level probe of the boiler is detecting water
10 Selection of the language for the recipe menu (lev. A)
It is possible to select a language for the menu of the recipes. To select the language, set parameter LanG to the correct value for the desired language (see the relevant parameter list).
11 Cleaning cycles (lev. A)
Each cleaning cycle can be divided into the repeating of 3 fundamental phases
TPF
3
FPT
:
Phase A
- Washing phase controlled through the parameters CLt1 (time of detergent injection) and CLt2 (time of detergent + water injection)
Phase B (like Phase A but with the final sub phase with 20 seconds of water)
- Washing phase controlled through the parameters CLt1 (time of detergent injection) and CLt2 (time of detergent + water injection)
Phase C
- Rinsing and drying phase controlled through the parameters CLt3 (time of rinse aid injection) and CLt4
(time of water injection)
The cleaning cycles are composed according the following table:
Cycle
SOFT CYCLE
MEDIUM CYCLE
STRONG CYCLE
Name of the program
CLEAN 1/SOFT
CLEAN 2/MEDIUM
CLEAN 3/STRONG
Composition of the phases
A+C
2A+C
2A+2B+C
EXTRA–STRONG CYCLE CLEAN 4/X-STRONG 2A+4B+C
At the end of a cleaning cycle (at the end of the acoustic signal) the oven enter a stand-by state, i.e. the boiler heating elements are not fed, the user interface shows only the time and the ON-OFF button led is the only lit up led. The exit from this stand-by state takes place with an action from the user: pressing of a button of the user interface or opening the oven door.
NB : To check the correct water installation, make sure the rotating wash arm does not turn below 100 rpm
(120 rpm max.)
12 Cycles, utilities, important parameters
Hot air cycle : Only the cavity heating elements/burners are working. The maximum temperature is 300 °C; if the set point is over 250 °C, the maximum working time that can be set is given by parameter dutM . If on a lev. A oven a humidity value is set, the lambda probe will control only the cavity flap.
3
At the beginning of each phase the cavity is brought at a certain temperature with a COOLING phase without water or with an hot air cycle
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Steam cycle : The maximum set point temperature is 100 °C (130 °C from firmware 2.6). Boiler heating elements/burners are controlled with the lambda probe (lev. A ovens) or with the by-pass probe (lev. B ovens) for a set point of 100 °C; for set point lower than 100 °C, the boiler is controlled with the cavity probe.
If the set temperature is over 100 °C, also the cavity heating elements/burners are switched on.
Combi cycle : Boiler and cavity heating elements/burners are working. Cavity heating elements/burners are controlled with the cavity probe; boiler heating elements/burners are controlled by the lambda probe (lev. A ovens) or by the by-pass probe (lev. B ovens). The maximum set point is 250 °C. From firmware 2.6, for a set point lower than 100 °C, to obtain the required steam the humidifier is used (not the boiler).
Regeneration cycle: In this cycle boiler and cavity heating elements/burners work alternatively during the first rising till the set point is reached. After the set point is reached, boiler and cavity works in parallel to maintain temperature and humidity.
DELTA-COOKING cycle : This cooking cycle is used with the meat probe and hot air, steam or combi cycle.
For this cycle it is set a Delta temperature (let’s call it
Δ
) and not a cavity set-point. The cavity will be thermostatically controlled to have in any moment a cavity temperature that is
Δ
°C over the meat probe temperature.
COOL : The cavity-cooling mode takes place with the fan running and water injection from the temperature of
180 °C (parameter trMA ) to the temperature of 40 °C (parameter trMn ). Passing from a cooking cycle to a steam cycle, an automatic cooling phase will take place if the cavity temperature is over the set point of the steam cycle.
Boiler automatic drain : The automatic boiler drain takes place each 15 minutes of working of the boiler heating elements/burners (parameter dbon in quarter of hour) and if the water temperature is lower than 50
°C (parameter tcdb ). Then the boiler is automatically filled
Board cooling : The cooling fan is activated starting from the temperature defined in parameter Sbc .
Boiler preheating : After the filling of the boiler, the water is heated up to 85 °C (parameter SPHb ) and maintained at this temperature if the boiler is not used (if the preheating is enabled i.e. if parameter dSPS is set to 1).
Hour counters : The hour counter parameters are the following:
hbol : boiler quarter of hour counter from the latest draining (automatic or manual)
hAir : hot air mode hour counter
hStM : steam mode hour counter
hcMb : combi mode hour counter
Parameter PPM : Setting this parameter to 1, the Energy Optimiser function is enabled (with Sicotronic system) in the foreseen electric ovens. The 2 high voltage digital inputs named IND4 (X10-11/5) and IND5
(X10-11/6) and the 2 output relays RL5 and RL24 are used. RL5 is closed each time the oven has to use the heating elements at half or full power while RL24 is closed when the heating elements have to be used at full power (independently from Sicotronic system). IND4 and IND5 are the high voltage inputs of the commands from Sicotronic system: if on IND4 and IND5 are present 230V the oven is working normally; if only one is at 230V the oven is forced from Sicotronic system to work at half power (with no visualization on the display); if both IND4 and IND5 are at 0V, the oven is forced to cut all the heating elements
Parameter dEMO : If enabled (set to 1), this parameter makes the oven working in demo function i.e. the user interface is fully working but the oven does not make any real function (no load is activated).
Parameter tbon : Timeout for E SL error; if it is set to 0 the control is disabled (from firmware 2.80).
Parameter AbSP : Setting this parameter to 1, the selected cooking cycle starts closing the door without pressing the START/STOP button.
Parameter dSPS : Setting this parameter to 1 the pre-heating of the boiler is disabled when the oven is not in cooking mode, so the pre-heating will start at the beginning of a combi or steam mode or of a recipe that provided the use of those modes in one of its steps.
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13 Gas system
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The gas system is made with CO and NO x
low emission burner. The main components are the following:
gas valve from SIT type SIGMA 848
DC burner fan that is intaking air through a calibrated mixer where the air–gas mixture is created; then the fun conveys the mixture to the burner
A cavity and a boiler heat exchanger made with a corrugated tube for increasing the efficiency
An ignition rod and a detection rod
A flame control device
An external igniter
Starting a cooking cycle, the POW board of the oven activates the flame control device and the burner fan whose speed is controlled with a PWM signal.
The POW board activates the flame control device. From pin 8 of this device a high voltage output (230 Vac) is carried to the relevant burner fan and to the high voltage digital input section of the POW board (X10/5÷8).
With an high voltage input on X10/5÷8, the POW board generates on X9/2÷5 a PWM signal to control the speed of the burner fans (a signal that defines the rotating speed of he fan and so the quantity of sucked air and gas) and the 12 Vdc on X9/1 to feed the inner board of the burner fan. The PWM signal changes according to the status of the burner, i.e.:
Start of the burner: controlled with parameters StcA (start of cavity burners) and Stbo (start of boiler burners).
Full power of the burner: controlled with parameters FucA (full power of cavity burners) and Fubo (full power of boiler burners)
Half power of the burner: controlled with parameters hAcA (half power of cavity burners) and hAbo (half power of boiler burners)
The quantity of sucked gas is controlled with those parameters (which are determining the speed of the burner fans), with the injector/diaphragm inserted at the outlet of the gas valve and with the calibration of the offset value on the gas valve.
The quantity of sucked air is controlled with the above parameters and with the calibrated aerator on the mixer.
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The ignition sequence is then the following:
•
The POW board activates the flame control device
•
After 1.5 s, the control device activates the fan that start at the speed determined with parameters Stxx
•
The flame control device activates the external igniter through pin 14, the igniter generates the spark for
4 s and after these 4 s there are 2 s for flame detection
•
If the flame is detected, the start speed is maintained for around 10 s and after this time the fans are carried to their working speed (half or full power)
•
If the flame is not detected, the fan keep on running for an interpurge phase of 15 s; after this phase there is a stop of the fan for 1 s and the ignition sequence is repeated. If the flame is still not detected there will be again 15 s of interpurge phase and then the last ignition attempts before the lockout signal.
In case of loosening of the flame signal during working, only one re-ignition attempts takes place.
So if the burner fan is off for at least 0.5 s (the fan is controlled from the flame control device through the
230Vac signal form pin 8), the POW board deduces that the flame control device is going to try again an ignition sequence and then goes back to the beginning of the ignition sequence. If on the contrary the burner fan is off for at least 5 s, the POW board deduces that the flame control device is in lockout.
In case of conversion to different type of gas, besides the injector/diaphragm also the parameters, which control the PWM signal, and the offset pressure calibration have to be changed according to the gas calibration table
NB: In case of changing from natural gas to LPG or G30 in some models, the fan flange (fig. 24) has to be changed; these changes has to be made in
•
CAVITY burner of 10 2/1 e 20 2/1 ovens
•
BOILER burner of 10 1/1, 10 2/1 e 20 1/1 ovens
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13.1 Gas valve
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Remove this threaded cap to get access to the offset adjustment screw
Offset pressure test point
Inlet pressure test point
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-
Fig. 23 - Injector
13.2 Offeset pressure calibration
+
Offset adjustment screw
Offset pressure test point
Fig. 24 – burner flange
For the adjustment of the offset pressure, connect a manometer with a resolution of 1 Pa (100 Pa=1 mbar) to the offset pressure test point after loosening the sealing screw. To adjust the cavity gas valve offset, set a hot air cycle, half power; to adjust the boiler gas valve offset select a steam cycle, half power. Wait around 3 minutes for the stabilization of the pressure before adjusting it turning slowly the screw indicated in the picture above.
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13.3 Use of manometer (for offset pressure measure)
Fig. 26 - Manometer 0S0388
Using the pressure inlet signed with “ + ” and with negative reading on the display as in the fig. 27-28, this means we are measuring – 0.16 hPa = – 16 Pa :
Fig. 27 Fig. 28
Using the pressure inlet signed with “ + ” and with positive reading on the display as in the fig. 29-30, this means we are measuring + 0.16 hPa = + 16 Pa :
Fig. 29 Fig. 30
Using the pressure inlet signed with “ – ” and with negative reading on the display as in the fig.31-32, this means we are measuring + 0.16 hPa = + 16 Pa :
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Fig. 31
Fig. 32
Using the pressure inlet signed with “ – ” and with positive reading on the display as in the fig. 33-34, this means we are measuring – 0.16 hPa = – 16 Pa :
Fig. 33 Fig. 34
14 Change of the microprocessor board
In case of changing of the microprocessor board, the following operations/calibrations have to be done:
1) Default parameter programming
2) Change parameters according parameter list
3) Lambda probe calibration for lev. A ovens
4) By-pass calibration (lev. B ovens) and cavity offset (parameter OCA1 ) or only cavity offset for lev. A ovens.
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APPENDIX A – WATER BOILING POINT
Height (m) Water boiling point (°C)
0 100.00
300 98.90
500 98.30
800 97.50
1000 96.80
1500 95.00
2000 93.50
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APPENDIX B – CONTACTORS DIAGRAM
Contactors used on AOS061E_, AOS101E_, AOS102E_
100% 1/2 100%
HOT AIR
100%
KS
K1
K2
K3
K4
1/2
COMBI
KS
K1
K2
K3
K4
STEAM
KS
K1
K2
K3
K4
1/2
Contactors used on AOS201E_, AOS202E_
100% 1/2
HOT AIR
100%
KS
K1
K2
K3
K4
K5
K6
K7
K8
1/2
COMBI
KS
K1
K2
K3
K4
K5
K6
K7
K8
STEAM
100%
KS
K1
K2
K3
K4
K5
K6
K7
K8
1/2
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APPENDIX C – CONNECTIONS ON MAIN BOARD
Put a jumper to make a short in the not used connections.
X20
X23
X17
X14
X21
X18
X22
X19
X15 X16
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X25/26-1
X24-1
X28-1
X2/3-1
X4/5-1
X1-1
X6/7-1
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X12/13-1
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X8-1
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Connector Description
X1 Main board supply (24 Vac)
X2/3
X4/5
Power supply to cavity fan motors, cooling fans, cavity flap motor, switching feeder for the lambda probe
Power supply to coils of cavity/boiler heating element contactors or cavity/boiler burner gas valves, steam condensing valve, humidifier valve, cavity lamps
X6/7
X8
X9
X10/11
Power supply to boiler water filling valves, boiler drain valve
Power supply to cleaning system
Output of PWM signal and 12 Vdc for burner fans
High voltage digital input, i.e. thermal protection of the cavity fan motors and command signal of the burner fans from the ignition devices
X12/13
X14
X15
X16
X17
X18
X19
Low voltage digital input, i.e. cleaning system water pressure switch, cavity limiter, boiler limiter, door micro switch and micro switch of the cavity flap
Connection of bypass probe
Connection of cavity probe
Connection of boiler probe
Connection of single point meat probe
Connection of second cavity probe
Connection of second boiler probe
X20, X21, X22 Connections of multi point probe
X23 Connection of lambda probe
X25/26 Connections of water level probes
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APPENDIX D – LAMBDA PROBE
In the lev. A AOS ovens the lambda probe is used to measure the humidity. How does it work?
The lambda probe permits measurement of oxygen concentration through a solid electrolyte (ceramic element)
The ceramic part of the probe is in the form of a tube closed at one end. The inside and outside surfaces of the ceramic sensor have a microporous platinum layer (electrode). The platinum layer, which is in contact with the analyzed gas, is covered with a highly porous protective ceramic layer.
The ceramic sensor (ZrOB
2
– solid electrolyte) is heated from inside by means of a ceramic heater so that the temperature of the sensor ceramic remains above 350 °C. Starting from 300°C, the ZrOB
2B
sensor becomes conductive for the oxygen ions so that if there is a different concentration of oxygen at the two sides of the sensors (one side is in contact with the analyzed gas, the other side is in contact with the external), a voltage is generated.
Since the Oxygen/Nitrogen ratio in the air is constant, a measurement of the concentration of oxygen enables the percentage of a third gas (in this case water vapor) to be determined. In fact the addition of a third gas to a sample of air has the effect of reducing in a proportional manner the presence of oxygen and nitrogen so that, as said, determining the relative concentration of oxygen allows the amount of the third introduced gas of the mixture to be determined (see the diagram).
100
90
80
70
60
50
40
30
20
10
0 nitrogen oxygen water
0 10 20 30 40 50 60 70 80 90 100 water percentage
Connections on the lambda probe:
Pin 1: not used
Pin 2-3: connections to the main board (connector X23)
Pin 4-5: connections to the switching feeder
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APPENDIX E – PARAMETER DESCRIPTIONS
AL1E
ALFn
APPL
APPM bAud
bot chr1 chr2 chr3 chr4 chr5 chr6 chr7 chr8
CLt1
CLt2
CLt3
CLt4 cort
cot dbon dCLn dEMO dSod dSPS dtSb dutM
E2PP
EcLn
EnFL
FAHr
FCLn
Fubo
FucA
GAS hAbo
HabP hAcA hAir hboL
HbYP
Nome Descrizione
6Prb
AbSP
Presence of 6-point meat probe (1=yes for lev. A, 0 for lev. B)
Flag to enable starting of cooking closing the door (0=disable; 1=enable)
Flag to enable detergent/rinser level probes (0=disable; 1=enable) when the relevant sensors are installed
Activation of cavity motor thermal protection
Level of the oven
Type of oven
RS485 bit rate
Max. steam generator overheating (ETUB alarm)
First character of the password
Second character of the password
Third character of the password
Fourth character of the password
Fifth character of the password
Sixth character of the password
Seventh character of the password
Eighth character of the password
Length of detergent injection (phase A)
Length of detergent+water injection (phase A)
Length of rinser+water injection (phase C)
Length of water injection (phase C)
Flag to enable cavity temperature displaying adjustment
Max. cooking chamber overheating (ETUC alarm)
Delay for boiler drain
Flag to disable automatic cleaning cycles (1=disable)
Flag to enable DEMO (0=disable; 1=enable)
Flag to disable the oven stops when door is open in convection, steam and combi mode: (0=the oven stops)
Flag to disable pre-heating of the boiler when the oven is in stand-by mode (0=enable pre-heating; 1=disable)
Delay for activation of fast filling during opening of boiler drain valve
Maximum length of a phase with cavity temperature over 250 ºC
Flag to enable storing/erasing of recipes on EEPROM (0=enable; 1=disable)
Temperature for starting time computation of phase 1 during semi-automatic cleaning
Presence of motorised cavity flap (1=yes)
Temperature unit (°F = 1, °C = 0)
Minimum time to force a cleaning cycle (0=no cleaning cycle)
PWM value at full power of boiler burners
PWM value at full power of cavity burners
Define if the oven is GAS heated (1) or ELECTRIC heated (0)
PWM value at middle power of boiler burners
Steam condenser engagement in "hot air" mode
PWM value at middle power of cavity burners
Hot air hour counter
Boiler hour counter
Max humidity value to stop the boiler
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Nome Descrizione
SbYP
SEAL
SinC
SPHb
SPHF
Stbo
StbP
StcA
StoF
Ston tbon tcdb tCMS thMA tPrn trMA trMn hcMb Combi hour counter
Hdut Flag to enable heater duty cycle (0=disable; 1=enable) hStM Steam counter
Huon
LAMb
LanG
ON phase of the humidifier with combi cycle beetween 50 and 100 degrees
Presence of lambda probe (1=yes)
Language for the menu
Man Flag to enable manual cookings (0=disable; 1=enable) nMod
OCA1
0lbd
PASS
PAUT
PFAC
PPM
PrEH
Sbc
Define if the modification of store program is disable
OFFSET of first cavity probe
Calibration of the lambda probe (0% of humidity)
Flag to enable password (0=disable, 1=enable)
Flag to enable special programs, i.e. preheating programs and Low temperature
(0=disable; 1=enable)
Flag to enable factory preset recipes (0=disable; 1=enable)
Flag to enable Peak Power Management (0=disable; 1=enable)
Flag to enable cavity preheating during cooking (0=disable; 1=enable)
Cooling temperature set for board ventilation
Bypass temperature with max. cooking cavity steam temperature (calibration)
Altitude above sea level
Boiler temperature that detect presence of scale
Preheating temperature of the boiler
Boiler temperature during leavening
PWM value at start of boiler burners
Steam condenser engagement in "boiler" mode
PWM value at start of cavity burners
Minimum time for "switch off" of boiler
Minimum time for "switch on" of boiler
Timeout for E SL alarm, water level probe alarm
Max water temperature for boiler drain
Limit of cavity temperature set for working at high temperature
Define the max. temperature limit for the manual injection of water
Print frequency (0=no print)
Define the max. temperature for water injection during cooling phase
Define the min. temperature for water injection during cooling phase
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APPENDIX F – WATER TREATMENT
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Summary table:
Graph
Hardness
Not required
< 5°F
Treatment Not required
Not required
> 5°F
Softener
Nanofilter
< 5°F
Nanofilter
Nanofilter Osmotizer Osmotizer
>5°F < 5°F > 5°F
Nanofilter Osmotizer Osmotizer
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APPENDIX G – CONNECTION TO HACCP SYSTEM
The AOS oven can be predisposed for the HACCP system through 4 parameters:
HCCP : defines the type of HACCP, i.e.
0: no system
1: HACCP Basic (with printer 881457 – 880048 for US market, i.e. 120V/1ph/60 Hz)
2: HACCP Advanced or Integrated bAud : bit rate of RS485 connection
Addr : address of the appliance in the HACCP Advanced network tPrn : print frequency in case of HACCP Basic (value in seconds)
In case of HACCP Basic, i.e. setting HCCP to 1, to use the printer 881457 (or 880048) and print with the printing frequency given through parameter tPrn , set on the printer the following parameters:
PROTOCOL = 8,E,1
BAUD RATE = 9600
PRINT = REVERSE
40 COLUMNS (font 9x24)
RS485 INTERFACE NO id
In case of HACCP Advanced or Integrated, i.e. setting HCCP to 2, the address of the oven in the AHCCP network has to be set in the parameter Addr .
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APPENDIX H – RELAY DESCRIPTIONS
RL 1/do1
RL 2/do2
RL 3/do3
RL 4/do4
RL 5/do5
RL 6/do6
RL 7/do7
RL 8/do8
RL 9/do9
RL 10/do10
RL 11/do11
RL 12/do12
RL 13/do13
RL 14/do14
RL 15/do15
RL 16/do16
RL 17/do17
RL 18/do18
RL 19/do19
RL 20 /do20
RL 21/do21
RL 22/do22
RL 23/do23
RL 24/do24
AOS ELECTRIC OVENS
FAN MOTOR POWER SUPPLY
HALF/FULL SPEED FAN MOTOR
COOLING FAN/S
SAFETY CONTACTOR (KS OR KS1&KS2) /LAMBDA FEEDER
N/A
CAVITY VENT VALVE
K2/K6 CONTACTOR/S (FOR CAVITY)
K4/K8 CONTACTOR/S (FOR BOILER)
K1/K5 CONTACTOR/S (FOR CAVITY)
K3/K7 CONTACTOR/S (FOR BOILER)
CAVITY UMIDIFIER SOLENOID VALVE
STEAM CONDENSER SOLENOID VALVE
CAVITY LAMPS
BOILER SLOW WATER FILLING
BOILER FAST WATER FILLING
BOILER AUTOMATIC DRAIN VALVE
N/A
N/A
N/A
N/A
DETERGENT PUMP
RINSE PUMP
WATER SOLENOID VALVE (CLEANING SYSTEM)
N/A
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AOS GAS OVENS
RL 1/do1
RL 2/do2
RL 3/do3
RL 4/do4
RL 5/do5
RL 6/do6
RL 7/do7
RL 8/do8
RL 9/do9
RL 10/do10
RL 11/do11
RL 12/do12
RL 13/do13
RL 14/do14
RL 15/do15
RL 16/do16
RL 17/do17
RL 18/do18
RL 19/do19
RL 20/do20
RL 21/do21
RL 22/do22
RL 23/do23
RL 24/do24
FAN MOTOR POWER SUPPLY
HALF/FULL SPEED FAN MOTOR
COOLING FAN/S
LAMBDA SWITCHING FEEDER
N/A
CAVITY VENT VALVE
CAVITY IGNITION DEVICE RESET
BOILER IGNITION DEVICE RESET
CAVITY IGNITION DEVICE POWER SUPPLY
BOILER IGNITION DEVICE POWER SUPPLY
CAVITY UMIDIFIER SOLENOID VALVE
STEAM CONDENSER SOLENOID VALVE
CAVITY LAMPS
BOILER SLOW WATER FILLING
BOILER FAST WATER FILLING
BOILER AUTOMATIC DRAIN VALVE
N/A
N/A
N/A
N/A
DETERGENT PUMP
RINSE PUMP
WATER SOLENOID VALVE (CLEANING SYSTEM)
N/A
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Key features
Advanced programming options allow for precise control over cooking parameters.
Intuitive user interface simplifies operation and reduces the risk of errors.
Extensive safety features protect users and the oven from potential hazards.
Versatile cooking modes accommodate a wide range of culinary techniques.
Durable construction ensures longevity and reliability in demanding commercial kitchens.
Advanced diagnostics and service utilities facilitate troubleshooting and maintenance.
Frequently asked questions
To enter advanced programming mode, switch on the oven and press the external service buttons during the lamp test phase. Follow the prompts on the display to navigate through the programming options.
The oven includes several safety features, such as a door interlock that prevents the oven from operating when the door is open, and a temperature limit switch that shuts off the oven if the temperature exceeds a safe level.
The oven is equipped with advanced diagnostics that can help you identify and resolve errors. You can also access service utilities to perform maintenance and calibration procedures.