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ISTRUZIONI PER L'INSTALLATORE
NOTICE POUR L'INSTALLATEUR
COMPACT
Combi Direct 7 / 11 x 1/1GN
2.8 TRANSFORMATION FOR DIFFERENT GAS TYPES. (Cooking chamber heating burner)
The appliances are usually supplied to function with the type of gas of installation KAT I3..., I2..., as stated in our technical features label.
Exceptionally when the type of gas is not known, the oven will be supply to function in KAT II2..., suitable for a transformation to a different kind of gas.
IN THIS CASE IF SUCH TRANSFORMATION IS NECESSARY, IT MUST BE DONE ONLY BY QUALIFIED PERSONNEL, TRAINED BY THE
MANUFACTURED WITH THE HELP OF THE TOOLS BELOW DESCRIBED.
The cooking chamber is equipped with a heating system with burner and pre-mixed gas.
This burner is so called because it mixes air and gas at a ratio of 1:1. It can burn without
producing harmful emissions, even when there is no more air, usually called secondary air,
normally present at the bottom of the flame.
The system comprises:
1- A gas solenoid valve (A);
2- A Venturi unit for air extraction (B);
3- An electric fan (C);
4- A unit with 2 electrodes (D), one for ignition and the other for flame control;
5- An electronic control box (E) for burner ignition and flame control;
6- An electronic control box (F) for adjusting the electric fan speed;
7- A "premix" type gas burner, positioned directly on the electric fan.
The appliance has been tested and equipped to operate with the gas shown on the data plate
on the right-hand side of the appliance.
If connections must be made using another type of gas, it will be necessary to transform
a 3 and 8 mm screwdriver, a frequency meter, a gas flow gauge and a combustion gas
analyser,
strictly following the following warnings:
2.8A Gas connection pressure control
Connection pressure is measured using a "U"-shaped gauge, on the pressure input (C) of
the gas valve.
Connection pressures are shown in the "Gas connection technical data" table 1.8
2.8B Checking the gas flow to the burner
1- Use the gas flow gauge to measure oven absorption.
2- Adjust the gas adjustment screw (A) as follows:
Turn it clockwise as far as it will go, and then loosen it for the no. of revolutions indicated
on the table1.8.
Attention
Turning the screw (A) anticlockwise or clockwise means increasing or
decreasing the gas flow..
Check burner ignition following the user instructions.
If the burner does not ignite, the gas solenoid valve will be disabled by the electronic
system, a red light on the RESET buttons will indicate a block.
Press this button again to repeat the operation.
Sometimes, especially if the gas connection systems are newly-manufactured, the
previous operation will have to be repeated a few times in order to guarantee normal gas
flow.
Check that ignition does not cause blasts or signs of resonance.
3 Adjust the speed of the electric fan (C) in (Fig. 2.8A-B), in the following ways:
A
Switch off the oven and connect the frequency meter to terminals (Y 1-3) on the
connector (X5) of the control panel (F) and start the oven again.
The speed of the electric fan is obtained from the following formula:
Speed rpm = Frequency (Hz) x 30
Checking the max. power
B
Start up the cooking chamber heating system, the burner will ignite with a low number of electric fan revolutions, (set by the
manufacturer). After ignition, the electric fan (C) will reach max. speed.
This speed must be the same as the value stated in the technical table 1.8.
The regulation of the trimmers K and J is made and sealed in our factory, you don't
need further regulations.
4
When the oven is started, select the temperature of the coking chamber at a max.
Temperature of 270°,check the gas flow when the temperature is about 200°C and
check that it corresponds to the one given in the table 1.8.
Then, using the smoke analyser, check that it complies with regulations for combustion
gases reaching the discharge chimney.
Due to its dangerousness, It is essential that the carbon monoxide CO value is at
zero.
After adjusting as described above, it will be necessary to check burner ignition again under
its two operating conditions:
Cold ignition is the norm at the start of operations;
Warm ignition is the condition present after at least 10 minutes of operating.
It is not necessary to check signs of resonance in the burner in either case. If there is
resonance, repeat the setting operations as described in paragraph 2.8B, point 2.
If the position of screw (A) is changed on the gas flow adjuster with the oven on at
maximum, it will be necessary to check point 4 again relating to cold operation.
N.B. The gas valve screw (B) (Fig.2.89B) does not require adjustment as it has
already been set by the manufacturer to an air/gas ratio of 1/1
When transformation has ended, it will be necessary to seal the gas flow adjustment screw (A).
INSTRUCTIONS FOR THE INSTALLER
INSTRUCCIONES PARA EL INSTALADOR
7 / 11 x 2/1GN
(Fig. 2.8B).
(Fig. 2.8B-C).
(Fig. 2.8A-B-C)
using
Fig. 2.8B
25
ANLEITUNGEN FÜR DEN INSTALLATEUR
Var-03
Fig. 2.8A
Fig. 2.8C
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