Checks; Introduction To Users - Diamond G77/4F7T-N Handbuch

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.
CHECKING THE "GENERAL" THERMAL CAPACITY
Any transformation for another type of gas (see Ch. 3) should be performed by an authorised fitter or assistant. The thermal
capacity to be checked could be:
- the nominal thermal capacity shown on the data label
- the maximum thermal capacity in the maximum position
- the minimum thermal capacity in the minimum position.
First of all, check whether the unity is already fitted for gas main and pressure; in case of transformation for operating with
other gas type, carefully check the nozzles markings, the idle screw and bypass referring to the Table II Injectors.
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 Injectors
Ignite the burner according to Chapter 6 "Instructions to Users" in the maximum position (
pre-heating, turn knob to the minimum position (
The oven should be heated up for at least 20 minutes by bringing the thermostat to position 8, then turn the knob to position 1.
Check the nozzle pressure and the minimum thermal capacity.
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".
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
2.8

INTRODUCTION TO USERS

Explain the operation and use to the user by consulting the manual, and illustrate any changes.
Leave the manual in the user's hands and explain the he/she should use it for further reference.
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