Ariston EuroCombi Type C A23 MFFI Guía del usuario

A/23 MFFI - A/27 MFFI

G.C.N. 47-116-18 / 47-116-19

Servicing Instructions

Type C Boilers

LEAVE THESE INSTRUCTIONS

ADJACENT TO THE GAS METER

2B029

Page No.

1. SERVICING INSTRUCTIONS

1.1 Replacement of Parts 3

1.2 To Gain General Access

- Removing the Front Panel 3

- Removing the Side Panels 4

- To Lower the Control Panel 4

1.3 Access to the Combustion Chamber

- Removing the Sealed Combustion Chamber 5

- Removing the Burner and Injectors 5

- Removing the Electrodes 6

- Removing the Main Heat Exchanger 7

- Removing the Air Pressure Switch 7

- Removing the Venturi Device 8

- Removing the Fan 8

1.4 Servicing and Removal of the Gas Valve

- Setting Gas Pressure 9

- Removing the Spark Ignitor 11

- Removing the Gas Valve 12

1.5 Access to the Hydraulic Circuit

- Removing the D.H.W. (Secondary) Exchanger 12

- Removing the Safety Valve 13

- Removing the Automatic Air Vent 13

- Removing the Main Flow Circuit Switch 13

- Removing the Pump 14

- Removing the Pressure Gauge 14

- Removing the Expansion Vessel 15

- Removing the Overheat Thermostat 15

- Removing the Heating Temperature Sensor (N.T.C.) 15

1.6 Access to the Control System

- Checking the Fuses 16

- Removing the Time Clock 16

- Removing the P.C.B.s 17

2. FAULT FINDING

2.1 Fault Finding Guide (Flow-chart) 18

2.2 Fault Finding Using the Total Check System 23

3. ELECTRICAL DIAGRAMS

3.1 Electrical Connection 24

3.2 Functional Flow Connection 25

4. SHORT SPARE PARTS LIST 26

TABLE OF CONTENTS

B029

1. SERVICING

INSTRUCTIONS

The life of individual components vary and they will need servicing or repla-

cing as and when faults develop.

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

ponent is the cause of any malfunction, and instructions for removal, inspec-

tion and replacement of the individual parts are given in the following pages.

1.1 Replacement

of Parts

1. To Gain 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.

To dismantle the front part of the casing, proceed as follows:

1. Remove screw “A” (see fig. 1.1);

. Lift the front panel up and forward (see fig. 1.2).

Fig. 1.2

Fig. 1.1

To ensure efficient safe operation, it is recommended that the boiler is servi-

ced 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).

4B029

Removing the side panels

1. Remove the screws “B”;

. Pull the panel away from the boiler, then lift the panel

up and away from the boiler (see fig. 1.2).

To lower control panel

1. Remove the screws “B”

. Push the two side panels outward slightly (fig. 1.5);

3. Rotate the control panel forward and down.

Fig. 1.4

Fig. 1.5

Fig. 1.7

Fig. 1.6

To access the areas where the adjustment and control devices are located,

simply remove the plugs by pressing from the inside, unscrew the screws “C”

and remove the bottom part of the instrument panel, rotating it upwards.

Fig. 1.3

Removing the sealed chamber

frontal cover

1.3 Access to the

Combustion Chamber

Remove the screws “D”

Remove the screws “E”

Removing the combustion cover

Fig. 1.08 Fig. 1.09

Removing the sealed chamber

frontal cover

Remove the screws “D”

Remove the screws “E”

Removing the combustion cover

EEE

Fig. 1.8 Fig. 1.9

B029

A/23 MFFI

A/27 MFFI

6B029

1. Remove the side panels of sealed chamber (fig. 1.10);

. Remove the screws “H”of the burner (see fig. 1.11);

3. Remove the burner (see fig. 1.12);

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

5. Replace in reverse order.

Removing the burner and the

injectors

Fig. 1.10

Fig. 1.11 Fig. 1.12

push

Fig. 1.10

push

A/23 MFFI A/27 MFFI

B029

Removing the electrodes 1. Remove rubber gasket “I”(see fig. 1.13);

. Disconnect ignition leads by pulling downward (see fig. 1.14);

3. To remove the flame sensor, disconnect the cable at its only connection

point close to the P.C.B. (see fig. 1.15);

5. Remove screw “J”using a Philips No. 2 star tip screwdriver (see fig. 1.16);

6. Slide the electrode gently downward (see fig. 1.17).

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 elec-

trode 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. 1.13

Fig. 1.14

Fig. 1.15

Fig. 1.16 Fig. 1.17

8B029

1. Disconnect the electrical connections “L”and silicone pipes “M”from their

connection points (see fig. 1.20);

. Remove screws “N”on the top of the sealed chamber (see fig. 1.21);

Use a No. 2 star tip screwdriver to remove the switch from the plate.

Fig. 1.21

Fig. 1.20

1. Drain the boiler of water;

. Release the two connection nuts “K”connecting the exchanger to the

flow and return pipes (see fig. 1.18;

3. Pull it straight out (see fig. 1.19).

Removing the main heat

exchanger

Removing the air pressure switch

Fig. 1.18

Fig. 1.19

A/23 MFFIA/27 MFFI

B029

1. Disconnect the silicone pipes “O”and remove the screw “P”

(see fig. 1.22);

. Extract the venturi (see fig. 1.23).

Removing the venturi device

Removing the fan (A/ 3 MFFI)

Fig. 1.22 Fig. 1.23

1. Disconnect electrical connections “Q”(see fig.1.24);

. Remove screws “R”(see fig.1.25).

3. Pull fan to the right, forward and remove (see fig. 126)

Fig. 1.24

Fig. 1.25 Fig. 1.26

A/23 MFFI

10 B029

1. Disconnect electrical connections and remove screws

“S”using a No. 2 star tipped screwdriver (see fig.1.27);

. Pull fan to the right, forward and remove (see fig.1.28);

3. Remove fan from mounting plate;

4. Remove screws “T”(see fig.1.29).

Fig. 1.27

Fig. 1.28 Fig. 1.29

A/27 MFFI

Removing the fan (A/ 7 MFFI)

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