1.4SERVICING AND REMOVAL OF THE GAS VALVE
Setting the gas pressures
1
B
A
VG001Aa
2
D
C
VG001Ac
3
E
VG001Ab
4
F
VG001Ad
Setting the minimum and the maximum power of the boiler
1.Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas.
2.To do this, remove the screw “A”.
Fit the pipe of the pressure gauge to the pressure connection of the gas valve “B”.
When you have completed this operation, replace the screw “A” securely into its housing to seal off the gas.
3.To check the pressure supplied by the gas valve to the burner, remove the screw “C”. Fit the pipe of the pressure gauge to the pressure outlet of the gas valve “D”.
Disconnect the compensation pipe either from the gas valve or from the sealed chamber.
4.Set the On/Off button to position < I > and the “summer/winter” switch to the winter position.
To set the maximum power, turn on the hot water tap and allow the hot water tap to run at a rate of about 8 litres/minute so that the main burner lights.
Adjust nut “E” on the modureg to set the gas pressure (displayed on the pressure gauge) corresponding to the maximum power (see TABLE “A” page 9).
5.To set the minimum power, disconnect a supply terminal from the modureg and adjust screw “F”.
Turn the screw clockwise to increase the pressure and coun-
pressure gauge) corresponding to the minimum power (see TABLE “A” page 9).
6. When you | have completed the above operations, | turn | off | the |
hot water | tap, | the | modureg | |
on the gas valve and replace the cap on the screw of | the | |||
modureg. |
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Setting the maximum heating circuit power
7. To set the maximum heating circuit power, place the On/Off button to position < I > and the “summer/winter” switch to winter position.
Turn the knob of the heating thermostat clockwise to maximum.
8.Remove the inspection panel of the P.C.B. and fit a small
9.Turn off the boiler by placing the main switch to the "Off" position.
Setting pressure for soft ignition.
Disconnect the detection electrode connection from the P.C.B..
Start the boiler and during the ignition sequence adjust the left hand potentiometer until the gas pressure reads the required gas pressure as per the table below.
Once the gas pressure is set turn off the boiler and
NB.: It may be necessary to reset the flame failure reset a number of times during this operation.
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| NATURAL GAS (G20) | BUTANE GAS (G30) | PROPANE GAS (G31) |
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| Recommended pressure for |
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| 8 mbar | 16 mbar | 16 mbar |
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8 | B063 |
