Hook-Up With The Gas System; Discharging The Products Of Combustion; Gas Units Type: A; How To Obtain The Nominal Thermal Capacity - MORGAN Catering Equipment Somina Serie Instrucciones Para La Instalación, El Uso Y El Mantenimiento

2.6

HOOK-UP WITH THE GAS SYSTEM

- The unit needs to be supplied with gas with the characteristics and pressure shown in Table II.
- The gas pressure is measured at the initial pressure test point with the burners on.
- The equipment is tested and preset in order to work with the gas indicated on the external adhestive plate.
* N.B. Should the supply pressure vary more than +10% of the nominal pressure, it is advisable to install a pressure
regulator upstream from the unit to guarantee the nominal pressure.
- Hooking up to the gas mains must be done with a metal pipe of suitable cross-section and a shut-off valve must be installed
upstream to standards.
- After hooking up to the gas mains, check there is no leakage at the fitting points with the soap solution method.
2.6.1

DISCHARGING THE PRODUCTS OF COMBUSTION

The units have to be installed in rooms suited to discharge the products of combustion that must take place in compliance
with the installation requirements. Our units are considered (see Table 1.1 technical data):
2.6.2

GAS UNITS TYPE: A

They are not fitted for being connected to an outlet check on the products of combustion.
The gas oven should be positioned under a suction hood whose system must have specifications in conformity with the
standards. This unit needs at least 2 m
Check the ventilation in the kitchen. It must be in accordance with current standards.
2.6.3

HOW TO OBTAIN THE NOMINAL THERMAL CAPACITY

Check whether the unit is fitted for the gas type, pressure and category corresponding to the main gas supply.
Information shown on the packing and/or unit label.
If the unit is fitted for another type of gas or pressure, you first need to transform it for working with the other kind of gas. See
Table II for the nozzles, minimum screw (by-pass), primary air adjustment, (X mm), pilot nozzle and 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 = G 20 - 20 mbar 3 + = G 30 - 29 mbar and/or G 31 - 37 mbar coupled gas and pressure.
In our sector we nearly always have to deal with G 31 - 37 mbar!
Table II shows the types of gas and pressure for all burners and their nozzles, the distance X mm of the primary air adjustment,
the minimum screw (by-pass), the pilot nozzle, the maximum and minimum nozzle pressure, the maximum and minimum
thermal capacity and the gas consumption in l/h (15°C) or in g/h in the case of L.P.G.
Caution: If the "dynamic" pressure of the gas upstream from the unit is lower than the minimum pressure of Table II,
connection is prohibited; furthermore, the fitter must notify the gas company that the supply pressure is too low.
N.B.: Should the pressure vary by more than +10% of the nominal pressure, e.g. for G 20 • 22 mbar it is advisable to install a
pressure regulator upstream from the unit to guarantee the nominal pressure.
Should the supply pressure exceed the maximum pressure of Table II, e.g. for G 20 • 25 mbar, notify the gas company.
Check whether the incoming and nozzle pressures correspond to the values given in Table II.
2.7

CHECKING THE PRESSURE

INCOMING PRESSURE CHECK (Pe) Fig. 1A
The pressure is measured with a pressure gauge 0 ÷ 80 mbars (precision at least 0.1 mbars).
The pressure test point (B) is on the gas ramp behind the instrument panel; undo the screw (A), attach the silicone rubber hose
to the pressure gauge, ignite the burner and note the incoming "dynamic" pressure. Fasten the screw (A) back on, check there
is no leakage with the soap solution method.
NOZZLE PRESSURE CHECK (Pi) Fig. 1B
The pressure test point (B) is over the nozzle holder; undo the screw (A) of the pressure test point (B), attach the silicone
rubber hose to the pressure gauge, ignite the burner and note the nozzle pressure.
2.8

ADJUSTING THE MINIMUM THERMAL CAPACITY

The minimum thermal capacity is not adjustable because the gas valve adjusts only the set full power.
All manuals and user guides at all-guides.com
3 /h • kW T.C. (Thermal Capacity).
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GB