Incoming Pressure Check (Pe); Nozzle Pressure Check (Pi); Adjusting The Minimum Thermal Capacity; Liquid Gas Operation Control - MBM MINIMA Serie Instrucciones Para La Instalación, El Uso Y El Mantenimiento

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.
2.4.1 INCOMING PRESSURE CHECK (PE) FIG. 3
Pressure is measured with a manometer 0 ÷ 80 mbar (precision at least 0.1mbar).
The pressure socket Fig. 3 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.
2.4.2 NOZZLE PRESSURE CHECK (PI) FIG. 2
The pressure socket is located above the nozzle holder (Fig. 2).
The silicone rubber is prepared for high temperatures and should be protected with tin foil to avoid its burning.
2.4.3

ADJUSTING THE MINIMUM THERMAL CAPACITY

The right minimum for thermal capacity is achieved by means of the "calibrated" bypass idle screw firmly tightened in
accordance with Table II.
Ignite the burner according to Chapter 5 "Instructions to Users" in the maximum position (8); after approx. 30 minutes of pre-
heating, turn knob to the minimum position (1).
For the 2nd and 3rd Family, the bypass idle screw should be all screwed down against its housing.
2.4.4

LIQUID GAS OPERATION CONTROL

Check whether the fitted nozzles comply with the indications on Table II.
Check whether the incoming pressure complies with the indications on Table II.
Make sure that the L.P.G. gas system has two pressure regulators of suitable capacity and that the evaporation capacity is sufficient.
See also the publication "Installation Regulations and Characteristics of L.P.G. Systems".
2.5

OPERATION CONTROL

- Start the unit in accordance with the use instructions.
- Make sure there are no leaks following the local procedures.
- Check the ignition and interignition of the pilot burner and the main burner.
- Make sure the flue gases are discharged regularly.
- Write on a sticker to be glued to the unit label, for what gas and pressure the unit has been calibrated.
2.6

INTRODUCTION TO USERS

Explain the operation and use of the Bain-Marie to its user by consulting the manual, and illustrate any changes.
Leave this instruction manual with the user and explain he/she must consult it for any future reference.
GB
- 16 -