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3.
- The unit should be supplied with gas having the characteristics and the pressure shown on Table II.
- The gas pressure is measured at the initial pressure outlet with the burner on (see Fig. 1 and Art. 3.2).
- The unit is tested and fitted to operate with natural gas H G20 - 20mbar.
* N.B. Should the supply pressure vary more than +10% of the nominal pressure, it is advisable to install a pressure
regulator ahead of the unit to guarantee the nominal pressure.
- Gas supply connection should be performed by means of metal piping of an appropriate cross section and an approved
shutoff cock should be fitted at source.
- Having connected the gas supply, you should make sure no leaks exist at the joints by checking with bubble soap.
3.1
DISCHARGE OF EXHAUST FLUE PRODUCTS
The units should be installed in premises suitable for the discharge of flue products, which must occur in compliance with the
installation instructions. Our equipment (see Table for technical data) is classified as:
3.2
GAS UNITS TYPE A
They are not suitable to be connected to a flue discharge control. The gas unit should be positioned beneath a draft hood with
its system complying with the Regulations. (This unit needs at least 2cu.m
Check kitchen ventilation: it should by complying with the Regulations in force.
3.3
HOW TO ACHIEVE THE NOMINAL THERMAL CAPACITY
Check whether the unit is fitted for the gas type, pressure and category corresponding with the main gas supply.
Indication shown on packing and/or the label of the unit.
If the unit is fitted for another gas type or pressure, you need to first effect a change over to the other gas type.
See Table II for the nozzle, the idle screw (bypass), the primary air regulation, (X mm), the pilot nozzle and the nozzle pressure
for the main burner.
N.B. : The names of nozzles "2H" and "3+" are shown on the left side of Table II.
2H= G20 - 20mbar
3+= G30- 29mbar and/or G31 - 37mbar coupled gas and pressure. In our sector, we almost always have to deal with G31 -
37mbar!
Table II shows the types of gas and pressure for all burners and respective nozzles, the X mm distance for the adjustment of
primary air (see Fig. 3), the idle screw (bypass), the pilot nozzle, the maximum and minimum pressure at nozzle, the maximum
and minimum thermal capacity, and the gas consumption in l/hr (15°C) or in g/hr in the case of L.P.G.
Attention: If the incoming gas' "dynamic" pressure to the unit is lower than the minimum pressure on Table II, connection is
prohibited; furthermore, the fitter should notify the gas Company that the supply pressure is too low.
N.B.: Should the pressure vary more to than +10% of the nominal pressure, e.g. for G20 - 22mbar, it is advisable to mount a
pressure regulator ahead of the unit in order to guarantee the nominal pressure.
Should the supply pressure exceed the maximum pressure on Table II, e.g. for G20 - 25mbar, notify the gas Company.
Make sure the inlet and nozzle pressures agrees with the values shown on Table II.
GB
GAS SYSTEM CONNECTION
3
/h • kW T.C. (Thermal Capacity).
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