DeLonghi DFS 903 Operation instructions

DFS 903
Professional cooker
Before operating this cooker,
please read these instructions carefully
Users Operating Instructions
GB

2
Dear Customer
Thank you for choosing one of our appliances which has been carefully designed and
built by our specialist staff and thoroughly tested to satisfy your cooking requirement.
We suggest that you read this Instruction Booklet so that you will understand fully how
to operate the appliances.
Please keep the booklet handy. You may wish to refer to it at a later date.
De Longhi

3
Contents
Model DFS 903
Page Number
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Features and technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electronic clock/alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
How to use the hob burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
How to use the multifunction oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
After sales service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Do’s and do not’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Care and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
For the installer
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fitting the adjustable feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Stability bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Provision for ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Gas installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Conversion to LPG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Lubrication of the gas taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

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This cooker has been designed, constructed and marketed in compliance with:
- safety requirements of EEC Directive “Gas” 90/396;
- safety requirements of EEC Directive “Low voltage” 73/23;
- protection requirements of EEC Directive “EMC” 89/336;
- requirements of EEC Directive 93/68.
Introduction
Congratulations on your purchase of this Delonghi dual fuel cooker which has been
carefully designed and produced to give you many years of satisfactory use.
Before using this appliance it is essential that the following instructions are carefully read and
fully understood.
We would emphasise that the installation section must be fully complied with for your safety
to ensure that you obtain the maximum benefits from your appliance.
Fig. 1
A
B
Backguard
Before installing the cooker, assemble the backguard “C” (fig. 1).
Please note that :
•The backguard “C” can be found
packed at the rear of the cooker.
•Before assembling remove any
protective film/adhesive tape.
•Remove the two spacers “A” and
the screw “B” from the rear of the
cooktop.
•Assemble the backguard as
shown in figure 1 and fix it by
screwing the central screw “B”
and the spacers “A”.
This appliance is designed and manufactured solely for the cooking of domestic
(household) food and in not suitable for any none domestic application and therefore
should not be used in a commercial environmement.
The appliance guarantee will be void if the appliance is used within a none domestic
environnement i.e. a semi commercial, commercial or communal environment.

5
Features and technical data
Fig. 2
2
13
4
6
5
Identification label
When you open the bottom
oven door the indentification
label is at the bottom right
hand side.
Gas burners
1. Triple-ring burner (TC) 3,50 kW
2. Semi-rapid burner (SR) 1,75 kW
3. Rapid burner (R) 3,00 kW
4. Auxiliary burner (A) 1,00 kW
5. Semi-rapid burner (SR) 1,75 kW
6. Auxiliary burner (A) 1,00 kW
Multifunction oven
– Bottom element 2050 W
– Top element 1250 W
– Grill element 2200 W
– Circular element 2500 W
– Fan motor 25 W
– Oven lamp 15 W
– Usable oven volume 96 dm3

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Control panel
Fig. 3
A
U
T
O
123456789
CONTROL PANEL - Controls description
1. Electronic clock/alarm
2. Multifunction oven switch knob
3. Multifunction oven thermostat knob
4. Front left burner control knob
5. Rear left burner control knob
6. Front central burner control knob
7. Rear central burner control knob
8. Rear right burner control knob
9. Front right burner control knob

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How to use the electronic clock
A
U
T
O
Fig. 4
The electronic programmer is a device
with the following functions:
– 24 hours clock with illuminated display
– Timing of oven cooking with automatic
switch-off (max. 99 minutes).
Electronic clock
Upon immediate connection of the oven
or after a mains failure, three zeros will
flash on the programmer panel.
To set the clock it is necessary to push the
button and then, within 7 seconds, the
or button until you have set the
correct time.
The clock will show zero after a mains
failure.
Attention: When the programmer display
shows three flashing zeros the oven
cannot be switched on.
The oven can be switched on when the
symbol is shown in the display.
Cooking with automatic
switch-off
The aim of this function is to automatically
stop the cooking after a pre programmed
time, for a maximum period of 99 minutes.
To set the cooking time, push the or
button until you obtain the desired
time in the display. The symbol AUTO
will be shown in the display. Then you
adjust the oven thermostat knob
according to the required temperature.
The oven will immediately start to operate
and will work for the pre programmed
time. The display shows the count down.
Clock time can be displayed by pressing
the button. Once the time has
elasped, the oven will switch off
automatically, the symbol AUTO will go
off and an intermittent buzzer, lasting 7
minutes, will start; this can be stopped by
pressing the button.
Important: Before the buzzer is
stopped switch off the oven manually.
To cancel the cooking program at any time
press the and buttons together and
release the button first.
Setting the frequency of
the alarm sound
The selection from 3 possibilities of
sound can be made by pressing the
button. Electronic alarm
The programmer can be used as an alarm
only for a maximum period of 99 minutes.
To set the alarm, push the or
button until you obtain the desired time in
the display. Once the time has elasped,
an intermittent buzzer, lasting 7 minutes,
will start; this can be stopped by pressing
the button.
Attention: If the bottom oven is
switched on when the buzzer starts, it
will be automatically switched off. For
it to operate furtherly you have to stop
the buzzer by pressing the button.

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How to use the hob burners
Hob burners
Each hob burner is controlled by a
separate gas tap operated by a control
knob (fig. 5) which has 3 positions marked
on the control panel, these are:
– Symbol ●: tap closed (burner off)
– Symbol : High (maximum)
– Symbol : Low (minimum)
Push in and turn the knob anti-clockwise
to the selected position.
Lighting of the hob burners
To ignite the burner, the following instructions are to be followed:
1) Lightly press and turn the knob anti-clockwise, and position the knob indicator to the
symbol printed on the control panel (fig. 5).
2) Press the knob to operate the electric ignition; or, in the case of a mains failure light the
burner with a match or lighted taper.
3) Adjust the burner according to the setting required.
Low High
To turn the burner off, fully rotate the knob clockwise to the off position: ●.
The maximum setting of the control tap is for boiling, the minimum setting is for slow
cooking and simmering.
All working positions must be choosen between the maximum and minimum setting, never
between the maximum setting and the “OFF” position.
Fig. 5
Electric ignition
The sparks generated by the electrodes close to the burners will ignite the choosen
burner. Whenever the lighting of the burners is difficult due to peculiar conditions of
the gas features or supply, it is advised to repeat the ignition with the knob on
“minimum” position.

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Burners Pan diameter
Auxiliary 12 ÷ 14 cm
Semi-rapid 16 ÷ 24 cm
Rapid 24 ÷ 24 cm
Triple-ring 26 ÷ 28 cm
Fig. 6
Choice of burner
The burner must be choosen according to the diameter of the pans and energy required.
Saucepans with handles which are excessively heavy, in relationship to the weight of the
pan, are safer as they are less likely to tip.
Pans which are positioned centrally on burners are more stable than those which are offset.
It is far safer to position the pan handles in such a way that they cannot be accidentally
knocked.
When deep fat frying fill the pan only one third full of oil.
DO NOT cover the pan with a lid and DO NOT leave the pan unattended.
In the unfortunate event of a fire, leave the pan where it is and turn off all controls.
Place a damp cloth or correct fitting lid over the pan to smother the flames.
DO NOT use water on the fire.
Leave the pan to cool for at least 30 minutes.
do not use pans with concave or convexe bases
AIR FLOW
(cooling fan) AIR FLOW (cooling fan) AIR FLOW (cooling fan)
CORRECT USE OF RAPID BURNER
Fig. 7

Correct use of triple-ring burner
The flat-bottomed pans are to be placed directly onto the pan-support.
To use the WOK you need to place the proper stand in order to avoid any faulty
operation of the triple-ring burner (Fig. 8a - 8b).
Fig. 8a
WRONG
Fig. 8b
CORRECT
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How to use the Multifunction oven
FUNCTION SELECTOR KNOB
(Fig. 7)
Rotate the knob clockwise to set the oven
for one of the following functions.
THERMOSTAT KNOB (Fig. 8)
This only sets the cooking temperature and
does not switch the oven on. Rotate
clockwise until the required temperature is
reached (from 50 to 225°C).
Operating principles
Heating and cooking in the MULTI-FUNCTION oven are obtained in the following ways:
a. by normal convection
The heat is produced by the upper and lower heating elements.
b. by forced convection
A fan sucks in the air contained in the oven muffle, which sends it through the circular
heating element and then sends it back through the muffle. Before the hot air is
sucked back again by the fan to repeat the described cycle, it envelops the food in
the oven, provoking a complete and rapid cooking.
It is possible to cook several dishes simultaneously.
c. by semi-forced convection
The heat produced by the upper and lower heating elements is distributed
throughout the oven by the fan.
d. by radiation
The heat is radiated by the infra red grill element.
e. by radiation and ventilation
The irradiated heat from the infra red grill element is distributed throughout the oven
by the fan.
Fig. 7 Fig. 8
Please note: This appliance incorporates a safety cooling fan which you will hear
operating whenever the oven or grill are in use. This fan is to reduce the external
temperature of the appliance and cool the internal components.
11

12
OVEN LIGHT
By setting the knob to this position, only the oven light comes on (15 W).
It remains on in all the cooking modes.
DEFROSTING FROZEN FOODS
Only the oven fan comes on. Use with the thermostat knob set to “●” - other positions
have no effect. The food is thawed by ventilation without heating.
Recommended for:
Quick thawing of frozen foods; one kg requires approximately 1 hour.
Thawing times vary according to the quantity and type of food to be thawed.
GRILLING
The infrared grill element comes on. The heat is dispersed by radiation.
Set the thermostat knob to between 50° and 200°C.
Always grill with the oven door closed.
For cooking hints, see the chapter “USE OF THE GRILL”.
Recommended for:
Intense grilling, browning, cooking au gratin and toasting etc.
Do not grill for longer than 30 minutes at any one time on full heat (200°C).
Caution: the oven door becomes very hot during operation.
Keep children well out of reach.
TRADITIONAL CONVECTION COOKING
The upper and lower heating elements come on. The heat is dispersed by natural
convection and the temperature must be set to between 50° and 225°C via the
thermostat knob.
The oven must be preheated before cooking.
Recommended for:
Food that requires the same degree of cooking both inside and out, for example roasts,
spare pork ribs, meringues etc.

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HOT AIR COOKING
The circular element and fan come on. The heat is dispersed by forced convection
and the temperature can be regulated to between 50° and 225°C via the
thermostat knob. The oven does not require preheating.
Recommended for:
Food which has to be well-cooked outside and soft or rosy inside, for example
lasagne, lamb, roast beef, whole fish etc.
VENTILATED GRILL COOKING
The infrared grill element and the fan come on. The heat is dispersed mainly by
radiation and the fan then distributes it all over the oven.
Use with the door closed. The temperature can be regulated via the
thermostat knob to between 50° and 175° max.
The oven must be preheated for approximately 5 minutes. For cooking hints, see
the chapter “GRILLING AND COOKING AU GRATIN.
Recommended for:
Grilling where quick browning on the outside is required to keep the juices in.
For example: veal steaks, chops, hamburgers etc.
Do not grill for longer than 30 minutes at any one time on full heat (175°C).
Caution: the oven door becomes very hot during operation.
Keep children well out of reach.
MAINTAINING TEMPERATURE AFTER COOKING OR
SLOWLY HEATING FOODS
The upper heating element, the circular element and the fan come on.
The heat is dispersed by forced convection with greater intensity in the upper part.
The temperature can be set to between 50° and 140°C via the thermostat knob.
Recommended for:
Keeping food warm after any type of cooking. Slow heating of cooked food.
CONVECTION COOKING WITH VENTILATION
The upper and lower heating elements come on and the fan.
The heat coming from above and below is dispersed by convection with ventilation.
The temperature can be set to between 50° and 225°C via the thermostat knob.
Recommended for:
Voluminous dishes and large quantities which require the same degree of cooking
both inside and out, for example rolled roasts, turkey, roast legs, cakes etc.

COOKING ADVICE
STERILIZATION
Sterilization of foods to be conserved, in full and hermetically sealed jars, is done in the
following way:
a. Set the switch to position .
b. Set the thermostat knob to position 185 °C and preheat the oven.
c. Fill the dripping pan with hot water.
d. Set the jars onto the dripping pan making sure they do not touch each other and
the door and set the thermostat knob to position 135 °C.
When sterilization has begun, that is, when the contents of the jars start to bubble,
turn off the oven and let cool.
REGENERATION
Set the switch to position and the thermostat knob to position 150° C.
Bread becomes fragrant again if wet with a few drops of water and put into the oven
for about 10 minutes at the highest temperature.
SIMULTANEOUS COOKING OF DIFFERENT FOODS
The MULTI-FUNCTION oven set on position consents a simultaneous
heterogeneous cooking of different foods. Different foods such as fish, cake and
meat can be cooked together without mixing the smells and flavors together. This
is possible since the fats and vapors are oxidized while passing through the
electrical element and therefore are not deposited onto the foods.
The only precaution to follow are:
– The cooking temperatures of the different foods must be as close to as possible,
with a maximum difference of 20° - 25 °C.
– The introduction of the different dishes in the oven must be done at different
times in relation to the cooking times of each one.
The time and energy saved with this type of cooking is obvious.
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USE OF THE GRILL
Preheat the oven for about 5 minutes.
Introduce the food to be cooked, positioning the rack as close to the grill as
possible.
The dripping pan should be placed under the rack to catch the cooking juices
and fats.
Grilling with the oven door closed.
Do not grill for longer than 30 minutes at any one time on full heat (200°C).
Caution: the oven door becomes very hot during operation.
Keep children well out of reach.
ROASTING
To obtain classical roasting, it is necessary to remember:
– that it is advisable to maintain a temperature between 180° and 200 °C.
– that the cooking time depends on the quantity and the type of foods.
GRILLING AND “AU GRATIN”
Grilling may be done without the roasting jack on position of the switch,
because the hot air completely envelops the food that is to be cooked.
Set the thermostat to position 175 °C and after having preheated the oven, simply
place the food on the rack.
Close the door and let the oven operate with the thermostat on position 175 °C,
until grilling is done.
Adding a few dabs of butter before the end of the cooking time gives the golden
“au gratin” effect.
Do not grill for longer than 30 minutes at any one time on full heat (175°C).
Caution: the oven door becomes very hot during operation.
Keep children well out of reach.
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Important notes
Installation, and any demonstration, information or adjustments are not included in the
warranty.
The cooker must be installed by a qualified person in accordance with the Gas Safety
(Installation and Use) (Amendment) Regulations 1990 and the relevant building/l.E.E
Regulations.
Failure to install the appliance correctly could invalidate any manufacturers warranty and
lead to prosecution under the above quoted regulation.
In the UK C.O.R.G.I registered installers are authorised to undertake the installation and
service work in compliance with the above regulations. All Comet authorised installers are
C.O.R.G.I. registered.
Attention
The appliance gets very hot, mainly around the cooking areas. It is very important
that children are not left alone in the kitchen when you are cooking.
Safety guard
The glass on the oven door reaches high temperatures during operation.
For child safety, a door guard can be fitted to prevent contact with the hot glass.
The door guard is supplied as an accessory at an additional cost if required.
To order telephone accessories direct 0870 6052020.
After Sales Service
If you should require After Sales Service please contact your nearest COMET Service Centre.
For technical information telephone the Comet Customer Help Line 0113 2793520.
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Do’s and do not’s
Do’s and do not’s
• Do always grill with the oven door closed.
• Do read the user instructions carefully before using the cooker for first time.
• Do allow the oven to heat for one and a half hours, before using for the first time, in order
to expel any smell from the new oven insulation, without the introduction of food.
• Do clean your oven regularly.
• Do remove spills as soon as they occur.
• Do always use oven gloves when removing food shelves and trays from the oven.
• Do not allow children near the cooker when in use.
• Do not allow fat or oils to build up in the oven trays, or oven base.
• Do not place cooking utensils or plates directly onto the oven base.
• Do not grill food containing fat without using the grid.
• Do not cover the grilling grid with aluminium-foil.
• Do not use the oven tray for roasting.
• Do not place hot enamel parts in water. Leave them to cool first.
• Do not allow vinegar, coffee, milk, saltwater, lemon or tomato juice to remain in contact
with enamel parts (inside the oven and on the oven tray).
• Do not use abrasive cleaners or powders that will scratch the surface of the stainless steel
and the enamel.
• Do not attempt to repair the internal workings of your oven.
• Do remove the protective film before the first use.
• Fire risk! Do not store flammable material in the oven and in the storage compartment.
For your safety
The product should only be used for its intended purpose which is for the cooking of
domestic foodstuffs.
Under no circumstances should any external covers be removed for servicing or
maintenance except by suitably qualified personnel.
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Cleaning the hob
Spillage on the hob can usually be removed by a damp soapy cloth. More obstinate stains
can be removed by rubbing gently with a soapy scouring pad or mild household cleaner.
Important:
As a safety measure, before you start cleaning the cooker be sure to disconnect it from the
mains supply.
Do not use a steam cleaner because the moisture can get into the appliance thus
make it unsafe.
Care and maintenance
Gas taps
If a tap becomes stiff, do not force; contact your local COMET Service Centre.
Flexible tube
From time to time, check the flexible tube connecting the gas supply to the cooker.
It must be always in perfect condition; in case of damage arrange for it to be replaced by a
C.O.R.G.I. registered installer.
Cleaning oven parts after use
The oven interior and the chromium plated shelves can be cleaned by damp soapy cloth.
Obstinate stains can be removed with nylon scouring pads and gentle, non-abrasive, liquid
cleaner. Provided the oven is wiped over immediately after roasting, only the minimum of
cleaning should be necessary.
Stainless steel surfaces
The stainless steel front panels on this cooker (facia, oven door, drawer or storage
compartment) are protected by a finger-print proof lacquer. To avoid damaging this
lacquer, do not clean the stainless steel with abrasive cleaners or abrasive cloths or scouring
pads.
ONLY SOAP/WARM WATER MUST BE USED TO CLEAN THE STAINLESS STEEL SURFACES.
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Fig. 10 Fig. 11
AB
Burners
They can be removed and washed only with
soapy water.
Detergents can be used but must not be
abrasive or corrosive.
Do not use abrasive sponges or pads.
Do not put in dishwasher.
After each cleaning, make sure that the burner-
caps, as well as the burners, have been well
wiped off and CORRECTLY POSITIONED.
It is essential to check that the burner flame
distributor F and the cap C has been correctly
positioned (see fig. 9) - failure to do so can
cause serious problems.
Check that the electrode “S” (fig. 9) is always
clean to ensure trouble-free sparking.
Note:
The electrode S must be very carefully
cleaned.
To avoid damage to the electric ignition
do not use it when the burners are not in
place.
F
C
S
Triple ring burner
The triple ring burner must be correctly positioned (see fig. 10); the burner rib must be
enter in their logement as shown by the arrow.
The burner correctly positioned must not rotate (fig. 11).
Then position the cap Aand the ring B(fig. 11).
Fig. 9
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Storage compartment
– The storage compartment is accessible through the pivoting panel.
Fig. 12
Fig. 13
Removal of the inner glass door panel
–The inner glass door panel can easily be removed for cleaning by unscrewing
the four screws (fig. 12).
–When re-assembly ensure that the inner glass is correctly positioned and do not
over tighten the screws.
Changing the oven light
1. Disconnect the electrical power supply (for example, by switching off the main
power switch).
2. Unscrew the light cover
3. Fit a new bulb.
4. Refit the cover.
Note:
Use only bulbs designed to resist up to 300°C with the following characteristics: 15 W,
230 V, type E-14.
Spare bulbs can be ordered from Accessories direct telephone [phone].
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