Ariston EuroCombi Type C A23 MFFI Guida utente
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
3
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).
A
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
B
Fig. 1.5
B
C
Fig. 1.7
Fig. 1.6
C
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
B
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
G
G
G
GG
GG
Fig. 1.08 Fig. 1.09
FF
F
F
Removing the sealed chamber
frontal cover
Remove the screws “D”
Remove the screws “E”
Removing the combustion cover
EEE
EE
Fig. 1.8 Fig. 1.9
DD
D
D
5
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
H
push
push
Fig. 1.10
push
push
A/23 MFFI A/27 MFFI
7
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
I
Fig. 1.14
Fig. 1.15
Fig. 1.16 Fig. 1.17
J
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
K
Fig. 1.18
K
Fig. 1.19
Fig. 1.19
M
M
L
NN
A/23 MFFIA/27 MFFI
9
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)
0P
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
Q
R
A/23 MFFI
Q
Q
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
S
S
T
T
A/27 MFFI
Removing the fan (A/ 7 MFFI)
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