Ariston MicroSYSTEM 10 RFFI Benutzerhandbuch

Servicing

Instructions

Type C Boilers

G.C.N: 41-116-04

LEAVE THESE INSTRUCTIONS

WITH THE END-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 main heat exchanger

- Removing the air pressure switch

- Removing the fan

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 frost thermostat

- Removing the regulation thermostat

1.6 ACCESS TO THE CONTROL SYSTEM

- Checking the fuses

- Removing the P.C.B.s

2. FAULT FINDING

2.1 FAULT FINDING GUIDE (FLOW-CHARTS)

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 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. 1.8

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. 1.12);

2. To remove the detection electrode disconnect the cable

at its connection point close to the P.C.B. (FIG. 1.13);

FIG. 1.12

FIG. 1.13

1.3.2 Removing the burner and jets

1. Remove the screws “F” from the burner (FIG. 1.10);

2. Remove the burner (FIG. 1.11);

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. 1.9);

2. Lift off the combustion cover.

1.3 ACCESS TO THE COMBUSTION CHAMBER

FIG. 1.9

FIG. 1.10

Fig. 1.11

3. Remove screw “H” (FIG. 1.14);

4. Gently slide the electrode downward (FIG. 1.15).

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. 1.14

FIG. 1.15

1. Drain the boiler of water;

2. Release the overheat thermostat sensor “I” (FIG. 1.16);

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

exchanger to the flow and return pipes (FIG. 1.17);

4. Remove the heat exchanger by sliding forward (FIG.

1.18).

1.3.4 Removing the main heat exchanger

FIG. 1.17

Fig. 1.16

FIG.1.18

1. Disconnect electrical connections “N”and silicon pipe “O”

(FIG.1.22);

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

(FIG.1.23);

3. Remove screws “R” (FIG.1.24);

4. Remove fan and mounting plate (FIG.1.25).

1.3.6 Removing the fan

1. Disconnect the electrical connections “K” and silicone

pipes “L” from their connection points (FIG. 1.19);

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

(FIG. 1.20);

3. Lift out the air pressure switch (FIG. 1.21);

4. Unscrew to remove the switch from the plate.

FIG. 1.20

FIG. 1.19

1.3.5 Removing the air pressure switch

FIG. 1.21

FIG. 1.24

FIG. 1.23

FIG. 1.22

FIG. 1.25

1.4 SERVICING AND REMOVAL

OF THE GAS VALVE

1.4.1 Setting the gas pressures

Setting 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.Turn off the gas supply at the isolation point under the

boiler

2. To do this, slacken the screw “A”.

Fit the pipe of the pressure gauge to the inlet pressure test point of the gas

valve “B”.

Turn on the gas supply at the isolation point under the boiler and with

the boiler running, read the inlet working pressure on the gauge.

When you have completed this operation, turn off the gas supply at the

isolation point under the boiler, remove the pressure gauge and tighten

the screw “A” securely into its housing to seal off the gas.Turn on the gas

supply at the isolation point under the boiler and test the screw for

gas escaping with an approved soap and water solution.

3. To check the pressure supplied by the gas valve to the burner, with the

boiler turned off, slacken the screw “C”.Fit the pipe of the pressure gauge

to the outlet pressure test point of the gas valve “D”.

Disconnect the compensation pipe “E”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 setting the external controls.

Adjust the 10mm nut “F” to set the 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. When you have completed the above operations, turn off the external

controls, re-connect the supply terminal to the modureg on the gas valve

and replace the cap on the screw of the modureg.

Setting pressure for soft ignition.

The soft light pressure is factory set.

If the ignition is not regular (e.g: not complete burner ignition or ignition

noise) check the soft light regulator position.

The soft light pressure will need adjusting as follows:

- Turn off electrical supply;

- referring to picture 4, open the dust cap of the soft light regulator, by

unscrewing in clockwise direction the white screw;

- turn the adjustment screw one step in the direction max to increase or in

the direction min to decrease the soft light pressure;

- after each adjustment of the regulator, turn on the electrical supply and

recheck burner ignition (wait 20 seconds between each cycle to allow

the gas valves’ internal servo system to reset).When the required level

is achieved, close the dust cap.

VG003Aa

VG003Ab

VG003Ac

VG002Ab

1.22

8.3

2.9 2.9

----

-----

0.91 Kg/h

------ Kg/h

22.9 mbar

---- mbar

28 mbar

0.90 Kg/h

------ Kg/h

29.5 mbar

---- mbar

37 mbar

6 x 1.30 6 x 0.77

6 x 0.77

Gas restrictor ¿

10 RFFI

TABLE A

TB016A

6. Remove the pipe from the pressure gauge and connect screw “C”to the

pressure outlet in order to seal off the gas.

7. 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 an approved soap and water solution.

FIG. 1.28

FIG. 1.29

1.4.3 Removing the gas valve

Important! Before removing the gas valve, ensure the gas

supply is turned off.

1. Disconnect all the cables from the solenoid and

modureg;

2. Remove the spark generator (see previous section);

3. Release the top nut “U”(FIG. 1.28);

4. Remove the screws “V”from the bottom of the gas valve

pipe (FIG. 1.29);

5. Remove the gas valve).

1.4.2 Removing the spark generator

1. Disconnect ignition leads “S”by pulling upward

(FIG. 1.26);

2. Remove the screw “T”(FIG. 1.27);

3. Remove the spark generator by pulling forward from the

gas valve.

FIG. 1.27

FIG. 1.26

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