Ariston MicroGENUS 23 MFFI Guide de l'utilisateur

Servicing

Instructions

Type C Boilers

G.C.N: 47-116-14

47-116-15

LEAVE THESE INSTRUCTIONS

WITH THE END-USER

Country of destination: GB

2B063

1. SERVICING INSTRUCTIONS

1.1 REPLACEMENT OF PARTS

1.2 TOGAIN GENERAL ACCESS

- Removing the front panel

- Removing the sealed chamber frontal cover

- Removing the side panels

1.3 ACCESS TO THE COMBUSTION CHAMBER

- Removing the combustion cover

- Removing the burner and jets

- Removing the electrodes

- Removing the main heat exchanger

- Removing the air pressure switch

- Removing the fan

- Removing the venturi device

1.4 SERVICING AND REMOVAL OF THE GAS VALVE

- Setting the gas pressures

- Removing the spark generator

- Removing the gas valve

1.5 ACCESS TO THE WATER CIRCUIT

- Removing the D.H.W. (secondary) exchanger

- Removing the safety valve

- Removing the automatic air vent

- Removing the main circuit flow switch

- Removing the pump

- Removing the pressure gauge

- Removing the expansion vessel

- Removing the overheat thermostat

- Removing the heating temperature sensor (N.T.C.)

- Removing the D.H.W. temperature sensor (N.T.C.)

- Removing the divertor valve actuator

- Removing the D.H.W. flow switch

1.6 ACCESS TO THE CONTROL SYSTEM

- Checking the fuses

- Removing the time clock

- Removing the P.C.B.

2. FAULT FINDING

2.1 FAULT FINDING GUIDE (FLOW-CHART)

3. ELECTRICAL DIAGRAMS

4. SHORT SPARE PARTS LIST

TABLE OF CONTENTS

2. The control panel moves downward and when pulled forward,

rotates on two lateral hinges; the panel stays in a semi-

horizontal position, which allows access to the inner parts of

the boiler (FIG. 1.2);

3. In order to increase the manouvering space, it is possible to

raise the control panel and rotate it to a fully horizontal position

(FIG. 1.3);

4. Remove the screws “B” from the front panel bottom lip

(FIG. 1.4);

5. Lift the front panel from the raised screws at the the top of the

casing (FIG. 1.5).

FIG. 1.4

FIG. 1.5

B063

1. SERVICING INSTRUCTIONS

The life of individual components varies and they will need

servicing or replacing as and when faults develop.

The fault finding sequence chart in chapter 2 will help to locate

which component is the cause of any malfunction, and instructions

for removal, inspection and replacement of the individual parts are

given in the following pages.

1.1 REPLACEMENT OF PARTS

1.2 TOGAIN GENERAL ACCESS

All testing and maintenance operations on the boiler require the

control panel to be lowered. This will also require the removal of

the casing.

Removing the front panel

1. Loosen the fastening screws“A”of the control panel located on

the lower part of the panel itself. (FIG. 1.1);

FIG. 1.3

FIG. 1.1

FIG. 1.2

To ensure efficient safe operation, it is recommended that the

boiler is serviced annually by a competent person.

Before starting any servicing work, ensure both the gas and

electrical supplies to the boiler are isolated and the boiler is

cool.

Before and after servicing, a combustion analysis should be made

via the flue sampling point (please refer to the Installation Manual

for further details).

After servicing, preliminary electrical system checks must be

carried out to ensure electrical safety (i.e.polarity, earth continuity,

resistance to earth and short circuit).

19.eps

14.eps

13.eps

FO016A/15.eps

16.eps

4B063

Removing the sealed chamber frontal cover

1. Remove the screws “C”(FIG. 1.6);

2. Lift the sealed chamber frontal cover from the locating pins

(FIG. 1.7).

FIG. 1.6

FIG. 1.7

Removing the side panels

1. Remove the four screws “D”for each side panel (FIG.1.8);

2. Pull the panel away from the boiler, then lift the panel up and

remove from the boiler (FIG.1.9).

FIG. 1.8

FIG. 1.9

18.eps 98.tif

17 eps 97.tif

Removing the electrodes

Before carrying out this procedure, unscrew and slide the

burner forward (see previous section).

1. Remove rubber gasket “G”(Fig. 1.13);

2. To remove the detection electrode disconnect the cable

at its connection point close to the P.C.B. (Fig. 1.14);

FIG. 1.13

FIG. 1.14

Removing the burner and jets

1. Remove the screws “F”from the burner (FIG. 1.11);

2. Remove the burner (FIG. 1.12);

3. Remove the jets using a No. 7 socket spanner;

4. Replace in reverse order.

B063

Removing the combustion cover

1. Remove the screws “E”(FIG. 1.10);

2. Lift off the combustion cover.

1.3 ACCESS TO THE COMBUSTION CHAMBER

FIG. 1.10

FIG. 1.11

Fig. 1.12

99.tif

12 eps

78 eps

49 eps

50 eps

6B063

3. Remove screw “H”(FIG. 1.15);

4. Gently slide the electrode downward (FIG. 1.16).

To replace, repeat the steps in reverse order, paying

particular attention to the following:

a-Centre the electrode in the positioning hole carefully,

otherwise the electrode may break;

b-Check that the cables have been connected correctly;

c-Check that the rubber gasket covers the cable/ electrode

connection point completely.

FIG. 1.15

FIG. 1.16

1. Drain the boiler of water;

2. Release the overheat thermostat sensor “I”(FIG. 1.17);

3. Release the two connection nuts “J”connecting the

exchanger to the flow and return pipes (FIG. 1.18);

4. Pull it straight out (FIG. 1.19).

Removing the main heat exchanger

FIG. 1.18

Fig. 1.17

FIG. 1.19

51 eps

11 eps

52 eps

75 eps

76 eps

6 eps

1. Disconnect electrical connections “N”and silicon pipes

“O”(FIG.1.23);

2. Remove screw “P”and remove the fan collar clamp “Q”

(FIG.1.24);

3. Remove screws “R”(FIG.1.25);

4. Remove fan and mounting plate (FIG.1.26).

Removing the fan

1. Disconnect the electrical connections “K”and silicon pipes

“L”from their connection points (FIG. 1.20);

2. Remove screws “M”on the top of the sealed chamber

(FIG. 1.21);

3. Unscrew to remove switch from the plate (FIG. 1.22).

FIG. 1.21

FIG. 1.20

B063

Removing the air pressure switch

FIG. 1.22

FIG. 1.25

FIG. 1.24

FIG. 1.23

FIG. 1.26

91.tif

90.tif 93.tif

94.tif

95.tif

96.tif

8B063

1.4 SERVICING AND REMOVAL

OF THE GAS VALVE

Setting the gas pressures

Recommended pressure for

soft-light ignition 8 mbar

NATURAL GAS (G20) BUTANE GAS (G30) PROPANE GAS (G31)

16 mbar 16 mbar

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.

VG001Aa

VG001Ac

VG001Ab

VG001Ad

B063

model 23

model 27

Regulating the heating power for

natural gas (G20)

model 23

model 27

Regulating the heating power for

butane gas (G30)

model 23

model 27

Regulating the heating power for

propane gas (G31)

23 MFFI

2.70

11.0

2.0

1.16

2.01 Kg/h

0.87 Kg/h

27.7 mbar

6.0 mbar

28 mbar

12 x 0.77

2.00 Kg/h

0.85 Kg/h

35.5 mbar

7.3 mbar

37 mbar

12 x 0.77

27 MFFI

3.15

11.0

1.6

1.26

2.34 Kg/h

0.94 Kg/h

27.7 mbar

4.6 mbar

28 mbar

2.31 Kg/h

0.93 Kg/h

35.5 mbar

6.0 mbar

37 mbar

14 x 1.30 14 x 0.77 14 x 0.77

TABLE “A”

CG007A

CG008A

CG009A

TB012A

10 B063

Removing the spark generator

1. Disconnect ignition leads “T”by pulling upward

(FIG. 1.27);

2. Remove the screw “V”(FIG. 1.28);

3. Remove the spark generator (FIG. 1.29).

10. Remove the pipe from the pressure gauge and connect

screw “C”to the pressure outlet in order to seal off the

gas.

11.Carefully check the pressure outlets for gas leaks (valve

inlet and outlet).

IMPORTANT!

Whenever you disassemble and reassemble the gas

connections, always check for leaks using a soap and water

solution.

FIG. 1.27

FIG. 1.28

FIG. 1.29

Soft-light

Adjustment Max Heating

Adjustment

61.eps

45.eps

43.eps

44.eps

VR015A.eps

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