Ariston MICROCOMBI 23 MFFI Guide de l'utilisateur

Servicing

Instructions

Type CBoilers

G.C.N: 47-116-16

LEAVETHESEINSTRUCTIONS

WITH THEEND-USER

Country of destination: GB

1. SERVICING INSTRUCTIONS

1.1 REPLACEMENT OF PARTS

1.2 TOGAIN GENERAL ACCESS

- Removing the front panel

- Removing the sealed chamber front 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 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 pump pressure switch

- Removing the safety valve

- Removing the automatic air vent

- 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 diverter valve microswitch

- Removing the diverter valve

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 manoeuvring 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 up and forward from the raised screws at the

the top of the casing (FIG. 1.5).

FIG. 1.4

FIG. 1.5

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.

1.2.1 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).

1.2.2 Removing the sealed chamber front cover

1. Remove the screws “C” (FIG. 1.6);

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

(FIG. 1.7).

FIG. 1.6

FIG. 1.7

1.2.3 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 at the base, then lift the

panel up and remove from the boiler (FIG.1.9).

FIG. 1.8

FIG. 1.9

1.3.3 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);

3. Remove screw “H” (FIG. 1.15);

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

FIG. 1.13

FIG. 1.14

1.3.2 Removing the burner and jets

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

2. Remove the burner (FIG. 1.12);

3. Disconnect the electrodes (see section 1.3.3);

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

5. Replace in reverse order.

1.3.1 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

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-Ensure that the left hand and right hand electrodes are

located the correct way round (facing each other), to

give the correct spark gap;

c-Check that the cables have been connected correctly;

d-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. Remove the overheat thermostat sensor, D.H.W. sensor

and heating sensor “I” (FIG. 1.17);

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

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

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

1.3.4 Removing the main heat exchanger

FIG. 1.18

Fig. 1.17

FIG. 1.19

1. Disconnect electrical connections “N” and silicone pipe “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).

1.3.6 Removing the fan

1. Disconnect the electrical connections “K” and silicone

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

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

(FIG. 1.21);

3. Lift out the air pressure switch (FIG. 1.22);

4. Unscrew to remove the switch from the plate.

1.3.5 Removing the air pressure switch

FIG. 1.25

FIG. 1.24

FIG. 1.23

FIG. 1.26

FIG. 1.21

FIG. 1.20

FIG. 1.22

1.4 SERVICING AND REMOVAL

OF THE GAS VALVE

1.4.1 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, loosen the screw “A”.

Fit the pipe of the pressure gauge to the inlet 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, loosen the

screw “C”. Fit the pipe of the pressure gauge to the pressure outlet test

point of the gas valve “D”.

Disconnect the compensation pipe either from the gas valve or from the

sealed chamber.

4. Push the On/Off button to “ON”position -green light- and push the Heating

button to “ON”position -green light-

Turn on the boiler by running a hot water tap.

Adjust the 10mm nut “E” on the modureg to set the maximum gas

pressure, turn the nut clockwise to increase and anti clockwise to decrease

the pressure until the required pressure is achieved (see TABLE Apage 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 Apage

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, push the On/Off button to the

“ON”position -green light- and push the Heating button and set the time

clock and any external controls to the “ON”position -green light.Turnthe

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 charts shown in page 9.

9. Turn off the boiler by placing the main switch to the "OFF" position.

Setting pressure for soft ignition.

Disconnect the detection electrode connection close to the P.C.B. (FIG.

1.14).

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.

model 23

Regulating the heating power for

natural gas (G20)

model 23

Regulating the heating power for

butane gas (G30)

model 23

Regulating the heating power for

propane gas (G31)

23 MFFI

2.78

11.0

2.0

1.16

2.02 Kg/h

0.87 Kg/h

27.5 mbar

6.2 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

TABLE A

CG010A

CG011A

CG012A

1.4.2 Removing the spark generator

1. Disconnect ignition leads “S” by pulling upward

(FIG. 1.27);

2. Remove the screw “T” (FIG. 1.28);

3. Remove the spark generator by pulling forward from the

gas valve (FIG. 1.29).

NB.: It may be necessary to reset the flame failure reset

a number of times during this operation.

10. Remove the pipe from the pressure gauge and connect

screw “C”to the pressure test point in order to seal off

the gas.

11.Carefully check the pressure test points 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

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