Ariston 47-116-15 Setting the gas pressures, Setting the maximum heating circuit power

Page 32

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- ter-clockwise to decrease the pressure (displayed on the

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, re-connect the supply terminal to

the

modureg

on the gas valve and replace the cap on the screw of

the

modureg.

 

 

 

 

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 cross-head screwdriver in to the right hand potentiometer. Turn clockwise to increase the pressure or counter-clockwise to reduce the pressure. Adjust the setting to the required heating pressure value (displayed on the pressure gauge), as indicated in the diagrams shown in page 10.

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 re-connect the connection to the P.C.B.

NB.: It may be necessary to reset the flame failure reset a number of times during this operation.

 

 

 

 

 

 

 

 

NATURAL GAS (G20)

BUTANE GAS (G30)

PROPANE GAS (G31)

 

 

Recommended pressure for

 

 

 

 

 

8 mbar

16 mbar

16 mbar

 

 

soft-light ignition

 

 

 

 

 

 

 

 

 

 

 

 

 

8

B063

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Contents Installation Instructions Type C Boilers Table of Contents General Information Overall View Installation Overall Dimensions Supply must be fused at 3 a Domestic Water Kent TN9 1RA Morley RoadTonbridge 80 mm Restrictor Extension Piping not insulated Piping insulated SystemsRestrictor No Restrictor Extension Piping not insulated Piping insulatedCalculating the lengths of the pipes, Electrical Diagram Central Heating Return Commissioning Control Panel Initial START-UP Operational Adjustments Status ANTI-FROST Device GAS Adjustments Methane Liquid Gas ButaneG20 Gas G30 16.0Maintenance Miscellaneous BoilerProgrammer Manufacturer Merloni TermoSanitari SpA Italy Technical Service Hot Line 01494Technical Information Servicing Instructions Type C Boilers Fault Finding Servicing Instructions Removing the front panelRemoving the sealed chamber frontal cover Removing the side panelsRemoving the electrodes Removing the combustion coverRemoving the burner and jets Removing the main heat exchanger Removing the air pressure switch Removing the fanSetting the gas pressures Setting the minimum and the maximum power of the boilerSetting the maximum heating circuit power Setting pressure for soft ignitionRegulating the heating power for Propane gas G31 Regulating the heating power for Natural gas G20Regulating the heating power for Butane gas G30 Removing the spark generator Removing the gas valve Removing the D.H.W. secondary exchangerRemoving the automatic air vent Removing the safety valveRemoving the main circuit flow switch Removing the pump Removing the pressure gauge Removing the expansion vesselRemoving the D.H.W. temperature sensor N.T.C Removing the heating temperature sensor N.T.CRemoving the D.H.W. flow switch Removing the overheat thermostatChecking the fuses Removing the time clockRemoving the P.C.B Fault Finding Finding diagrams described in this chapterYES YES ∆ P 1.2 mbar YES Electrical Diagrams MicroGENUS 23/27 Mffi MicroGENUS 23/27 Mffi Ariston Page Manufacturer Merloni TermoSanitari SpA Italy Microgenus 27 Mffi Cod Part Code Description 998924 Panel combustion chamber front 571770 Main flow switch top cap
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