ISTRUZIONI PER L’INSTALLATORE
INSTRUCTIONS FOR THE INSTALLER
ANLEITUNGEN FÜR DEN INSTALLATEUR
NOTICE POUR L'INSTALLATEUR
INSTRUCCIONES PARA EL INSTALADOR
COMPACT Combi Direct 7 / 11 x 1/1GN 7 / 11 x 2/1GN
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2.8 TRANSFORMATION FOR DIFFERENT GAS TYPES. (Cooking chamber heating burner)
(Fig. 2.9A-B-C)
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
using a
3 and 8 mm screwdriver, a frequency meter, a gas flow
gauge and a combustion gas
analyser,
strictly following the following warnings:
2.9A Gas connection pressure control
(Fig. 2.9B).
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 1.9
2.9B Checking the thermal capacity of the burner
(Fig. 2.9B-C).
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 table.
N.B.
Turning the screw (A) anticlockwise or clockwise means increasing or decreasing
the gas flow to the Venturi.
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. If it does, slightly adjust
the screw (A), max. 1/10 revolutions, according to the technical data table until correct
operation is obtained.
3 Adjust the speed of the electric fan (C) in (Fig. 2.9A-B), in the following ways:
A Switch off the oven and connect the frequency meter to terminals (Y 1-3) on the
connctor (X5) of the control panel (F). The speed of the electric fan is obtained from the following formula:
Speed rpm = Frequency (Hz) x 30
B Checking the max. power
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 adjusted according to the value given in the technical table
1.9A, turning it clockwise to increase the value and viceversa to decrease it, using
the special screwdriver on the trimmer (K) RV4 of the control panel (F) (Fig. 2.9C)
4 Using the appropriate gauge, check that the gas flow corresponds to the one given in the
table 1.9°. Then, using the smoke analyser, check that it complies with regulations for
combustion gases reaching the discharge chimney.
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 2.9B, 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.2.9B
) 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) and the trimmer screw (K) on the control panel (F) (Fig. 2.9C), using a suitable varnish.
Attention: The conversion to other gas types, described at paragraph 2.9, must be solely
done by qualified person, authorized by the manufacturer.
Fig. 2.9C
Fig. 2.9A
Fig. 2.9B
