Installation Place; Positioning; Mounting The Top Units On A Base Or An Extending Support; Gas System Connection - Diamond G77/4F7T-N Handbuch

2.3

INSTALLATION PLACE

- The unit should be installed in adequately ventilated places. (This unit requires a draft of at least 2cu.m/hr l kW T.C.
(Thermal Capacity).
- Install the equipment in compliance with the safety rules applicable in the country where the equipment is installed.
2.4

POSITIONING

- The various units may be installed individually or together with other units of our range.
- This unit is not suitable for encasing.
- The distance between side walls must be a minimum of 10cm; should the distance be less or the wall or floor material be
flammable, it is essential to use a thermal insulator.
2.5

MOUNTING THE TOP UNITS ON A BASE OR AN EXTENDING SUPPORT

All Top units are supplied with height-adjustable feet (P):
- When the unit is to be placed free on a table or a surface,
tighten or loosen the feet (P) as shown in the illustration till it
is perfectly steady, then tighten the locknut (D) so that the foot
is blocked. To prevent slipping, insert the rubber plugs (M)
into the feet's lower holes.
- When the unit is to be fixed to a base or an extending support,
adjust the feet (P) till it is perfectly steady, then tighten the
locknut (D) so that the foot is blocked. Subsequently fasten
from beneath by way of M5 screws (T) and respective washers,
screwing them into the feet as shown in the illustration.
2.6

GAS SYSTEM CONNECTION

- 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)
- 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.
DISCHARGE OF EXHAUST FLUE PRODUCTS UNDER A DRAFT HOOD. TYPE A
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.
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UNIT.
1
GB