Installation Instructions; How To Achieve The Nominal Thermal Capacity - Diamond C4GA7-SP Mode D'emploi

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* 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 special instruments or

with soapy water

DISCHARGE OF EXHAUST FLUE PRODUCTS UNDER A DRAFT HOOD. TYPE A1 UNIT.

The gas unit should be installed under a draft hood whose system ought to have characteristics complying with Regulations.

(This unit requires a draft of at least 2cu.m/hr l kW T.C. (T.C.= Thermal Capacity).

Check kitchen aeration: it should be in compliance with law in force.

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 - 22 mbar, 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.

2.7

CHECKS

INCOMING PRESSURE CHECK (Pe) Fig. 1

Pressure is measured with a manometer 0 ÷ 80mbar (precision at least 0.1mbar).

The pressure socket Fig. 1 is located on the G 1/2" gas ramp behind the panel; undo the screw (A) of the pressure socket (B),

attach the silicone rubber to the manometer, ignite the burner (Fig. 3 position 4) and take the incoming "dynamic" pressure.

Fasten the screw (A) back with a gas washer (C), check gas sealing with bubble soap.

NOZZLE PRESSURE CHECK

The pressure intake is over the nozzle (Fig. 2).

The silicone rubber is prepared for high temperatures and should be protected with tin foil to avoid its burning.