Ariston EcoGENUS 24 MFFI Benutzerhandbuch

Servicing

Instructions

Type C Boilers

G.C.N: 41-116-03

47-116-17

LEAVE THESE INSTRUCTIONS

WITH THE END-USER

Condensing

Country of destination: GB

1. SERVICING INSTRUCTIONS

1.1 REPLACEMENT OF PARTS

1.2 TOGAIN GENERAL ACCESS

- Lowering the control panel and removing the front panel

- Removing the side panels

1.3 ACCESS TO THE COMBUSTION CHAMBER

- Removing the sealed chamber front cover

- Removing the fan

- Removing the burner

- Removing the electrodes

- Removing the heat exchanger inspection panel

- Removing the condensate collector

- Removing the condensate trap

- Removing the injector

1.4 ACCESS TO THE GAS VALVE

- 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 diverter valve actuator

- Removing the D.H.W. flow switch

- Removing the pump

- Removing the pressure gauge

- Removing the expansion vessel

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

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

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

1.6 ACCESS TO THE CONTROL SYSTEM

- Checking the fuses

- Removing the time clock

- Removing the P.C.B.s

2. FAULT FINDING

2.1 FAULT FINDING GUIDE (FLOW-CHART)

3. ELECTRICAL DIAGRAMS

4. SHORT SPARE PARTS LIST

TABLE OF CONTENTS

FIG. 1.2

FIG. 1.1

1. SERVICING

INSTRUCTIONS

The life of individual components vary 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.

To lower the control panel and dismantle the front part of the casing,

proceed as follows:

1. Unscrew screws “A” (1/4 turn only) (FIG. 1.1 + FIG. 1.2) and rotate the

control panel forward;

2. Unscrew the screws “B” (FIG. 1.3) and unhook the front panel by lifting it.

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).

FIG. 1.3

Removing the side panels

1. Remove the screws “C” (FIG. 1.4);

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

up and away from the boiler.

1.3 ACCESS TO THE

COMBUSTION CHAMBER

FIG. 1.5

FIG. 1.4

D D

Removing the sealed chamber front cover

1. Remove the screws “D” (FIG. 1.5);

2. Pull the cover away from the boiler (FIG. 1.6).

FIG. 1.6

Removing the fan

1. Loosen nut “E” (FIG. 1.7);

2. Pull off the hose “F” and disconnect the electrical

connector “G” (FIG. 1.8);

3. Remove the nuts “H” (FIG. 1.9);

4. Pull the fan away from the exchanger (FIG. 1.10).

FIG. 1.10

FIG. 1.9

FIG. 1.7

FIG. 1.8

Removing the burner

With the fan removed (see previous section);

1. Slide the burner from its housing (FIG. 1.11).

FIG. 1.13

Removing the electrodes

1. Pull off the ignition cable “I” (FIG. 1.12);

2. Remove the two allen bolts “J” (FIG. 1.13);

3. Extract the electodes (FIG. 1.14).

FIG. 1.12

FIG. 1.11

FIG. 1.14

Removing the combustion chamber inspection panel

1. Remove the four nuts “K” (FIG. 1.15);

2. Remove the inspection panel (FIG. 1.16).

FIG. 1.15

FIG. 1.16

Removing the condensate collector

1. Remove the nuts “L” from each side of front of the

collector (FIG. 1.17);

2. Remove the nuts “M” from each side of rear of the

collector (FIG. 1.18);

3. Release the condesate trap union “N” (FIG. 1.19);

4. Separate the collector from the combustion

chamber(FIG. 1.20);

5. Remove the condensate collector (FIG. 1.21).

FIG. 1.17

FIG. 1.18

FIG. 1.19

FIG. 1.20

FIG. 1.21

Removing the condensate trap

1. Loosen the union “O” (FIG. 1.22);

2. Remove the condensate trap (FIG. 1.23).

FIG. 1.22

Removing the injector

See the section on removing the fan before carring out this

procedure

1. Disconnect all connections from the fan and remove

(FIG. 124);

2. Remove the four screws “P” (FIG. 125);

3. Unscrew the injector “Q” using a suitable screwdriver

(FIG. 126);

4. Remove the injector (FIG. 127).

Fig. 1.23

Fig. 1.24

Fig. 1.25

FIG. 1.26

FIG. 1.27

1.4 ACCESS TO THE GAS VALVE

FIG. 1.28

Removing the gas valve

1. Disconnect the electrical connection “R” from the gas

valve (FIG. 128);

2. Release the top nut “S” (FIG. 1.29);

3. Remove the screws “T” from the bottom of the gas valve

pipe (FIG. 1.30);

4. Remove the gas valve (FIG. 1.31).

FIG. 1.29

FIG. 1.30

FIG. 1.31

T T

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