Ariston 41-116-04 Setting the gas pressures, Servicing and Removal of the GAS Valve

1. Check that the supply pressure to the gas valve is a minimum of 20 mbar

for natural gas. Turn off the gas supply at the isolation point under the

boiler

2. To do this, slacken the screw “A”.

Fit the pipe of the pressure gauge to the inlet pressure test point of the gas

valve “B”.

Turn on the gas supply at the isolation point under the boiler and with

the boiler running, read the inlet working pressure on the gauge.

When you have completed this operation, turn off the gas supply at the

isolation point under the boiler, remove the pressure gauge and tighten

the screw “A” securely into its housing to seal off the gas. Turn on the gas

supply at the isolation point under the boiler and test the screw for

gas escaping with an approved soap and water solution.

3. To check the pressure supplied by the gas valve to the burner, with the

boiler turned off, slacken the screw “C”. Fit the pipe of the pressure gauge

to the outlet pressure test point of the gas valve “D”.

Disconnect the compensation pipe “E”either from the gas valve or from

the sealed chamber.

4. Push the On/Off button to “ON” positiongreen-

light- and push the Heating

button to “ON” positiongreen-

light-

Turn on the boiler by setting the external controls.

Adjust the 10mm nut “F” to set the gas pressure Turn the nut clockwise to

increase and anti clockwise to decrease the pressure until the required

pressure is achieved (see TABLE A page 9)

5. When you have completed the above operations, turn off the external

controls, re-connect the supply terminal to the modureg on the gas valve

and replace the cap on the screw of the modureg.

Setting pressure for soft ignition.

The soft light pressure is factory set.

If the ignition is not regular (e.g: not complete burner ignition or ignition

noise) check the soft light regulator position.

The soft light pressure will need adjusting as follows:

-

Turn off electrical supply;

-

referring to picture 4, open the dust cap of the soft light regulator, by

unscrewing in clockwise direction the white screw;

- turn the adjustment screw one step in the direction max to increase or in

the direction min to decrease the soft light pressure;

- after each adjustment of the regulator, turn on the electrical supply and

recheck burner ignition (wait 20 seconds between each cycle to allow

the gas valves’ internal servo system to reset). When the required level

is achieved, close the dust cap.

4

VG002Ab