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4 Operating the appliance ..........................................................................14

4.1 Putting the appliance into operation ................14

4.2 Reading the various current values ..................14

4.3 Description of the parameters ...........................15

4.4 Modification of the user-level parameters ........15

4.5 Installation shutdown .........................................16

4.6 Frost protection ..................................................16

5 Checking and maintenance .....................................................................17

5.1 General instructions ...........................................17

5.2 Periodic checks ..................................................17

5.3 Filling the system ...............................................18

5.4 Bleeding the heating system .............................20

5.5 Draining the installation .....................................23

6 Troubleshooting .......................................................................................24

6.1 Error codes ..........................................................24

6.1.1 User reset ..............................................................25

6.1.2 Description of error codes .....................................266.1.3 Other error codes ..................................................26

6.2 ......................................27

7 Technical characteristics ........................................................................28

7.1 Technical characteristics ...................................28

8 Energy savings .........................................................................................29

8.1 Energy-saving advice .........................................29

8.2 Room thermostat and settings ..........................29

9 Warranty ....................................................................................................30

9.1 General ................................................................30

9.2 Warranty terms ...................................................30

Contents

2141210 - 119577-AGSubject to alterations

Problems and solutions

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3.1.4. Electricity generation

The boiler is fitted with a single-cylinder Stirling Microgenengine.

This engine functions by the repeated heating and cooling of a

quantity of helium (under pressure) in the cylinder. The gas is heated

at the top of the cylinder and cooled by water at the base of the

cylinder; the pressure difference thus created drives a piston whichmoves from the top to the bottom. The piston is fitted with magnets

which are driven through a fixed coil and thus generate an alternating

current with a frequency of 50 cycles per second (50 Hz).

To be able to operate, eVita must be connected to an

existing electrical circuit, 230 VAC, 50 Hz. The boiler uses

a three-wire cable for clean energy consumption and

supply of the electricity generated, approximately 1000

W. It is not necessary to allow for additional wiring for the

current generated.

When does the boiler produce electricity?

When there is a demand for heat, the Stirling engine burner will be

the first to come into service to produce heat for the central heating

and electricity. If it transpires that the quantity of heat required is

higher than can be provided by the engine's burner alone, the

auxiliary burner will come into service. In this way no concession is

made in the heated comfort of the dwelling. When the demand is for

domestic hot water only (in the case of a boiler which includes the

production of domestic hot water), only the auxiliary burner will come

into service. The engine's burner is not operating and, therefore, will

not generate electricity. In the case of a heating-only boiler associated

with an external hot water tank, the engine's burner will nevertheless

start in the event of demand for domestic hot water. In this event

electricity is generated.

When connecting to and disconnecting from the mains, a

short "bang" noise may be heard. This is not an anomaly

but a normal phenomenon.

eVita 25s - 28c 3. Description

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Subject to alterations10

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3.2 Main parts

1Smoke nozzle 2Casing/air box 3Heat exchanger front plate

4Degassing chamber 5Auxiliary-burner ignition transformer 6Engine burner ignition transform

7MicrogenStirling engine 8Start/stop resistance 9Instrument box

10Overload switch 11Air intake 12Outlet for measuring combustion

gases

13Heat exchanger front plate 14Ignition electrode supplementary burner 15Automatic air vent

16Ionization electrode supplementary

burner

17Condensation channel 18Condensate float switch

19Siphon 203-way valve

(Only on models with domestic hot water

production)

21Plate heat exchanger

(Only on models with domestic hot

water production)

22Flow sensor 23Safety valve 24Condensate evacuation hose

25Capacitor 26Air diffuser actuator 27Air diffuser

28Auxiliary Venturi burner 29Engine's Venturi burner 30Fan

31Water cooled seal 32Ionization electrode engine burner 33Ignition electrode engine burner

34Combined auxiliary-burner gas valve

unit

35Combined engine-burner gas valve unit 36Pressure gauge

37Shunt pump 38Expansion vessel

T001974-B

3

1

2

4

5

6

7

8

21

23

22

24

19

20

18

9 10

17

12

14

15

16

13

11

37

36

35

34

31

32

33

30

29

28

27

26

25 38

3. Description eVita 25s - 28c

11 141210 - 119577-AGSubject to alterations

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T001183-C

2 barMin. 1 bar

T001166-04-C

Boiler temp

State burner 1+2

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T000557-04-A

Boiler temp

State burner 1+2

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T001183-C

2 barMin. 1 bar

T001507-B

12

3

4

T000181-B

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5.3 Filling the system

1. Check the water pressure in the heating system.

If the water pressure is lower than 0.8 bar, more water

should be added. Fill the system with clean tap water

(advised water pressure is between 1.5 and 2.0 bar).

2. Open the valves on all radiators connected to the heating system.

3. Delete the request for central heating and DHW.

4. Check that the output generated is 0 W (Press the key several

times).

5. If the output generated is 0 W: Switch off the power in an

appropriate manner.

6. Wait until the temperature drops below 40C and the radiators

seem cold before filling the central heating system.

7. To fill with water, use a filling tube with two tap connections, a rag

and a bleed key.

T001183-C

2 barMin. 1 bar

12

3

4

T000181-B

T900057-A

T000185-A

T000845-A

eVita 25s - 28c 5. Checking and maintenance

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12.Open the filling/draw-off valve on the heating system.

13.Open the running water tap.

14.Use the pressure gauge to check the water pressure in the heating

system.

15.Close the water tap when the water pressure reaches 2 bar.

16.Close the filling/draw-off valve on the heating system. Leave the

tube on the filling/draw-off valve until the air is purged from the

installation.

When water is added, air gets into the heating system.

Degas the installation. After the air has been vented, the

water pressure can drop below the required level. Use thepressure gauge to check the water pressure in the heating

system. If the water pressure is lower than 0.8 bar, more

water should be added.

17.After filling the installation, switch the boiler on.

Filling and bleeding the installation 2 times a year should

be sufficient to obtain an adequate hydraulic pressure. If it

is often necessary to top up the installation with water,

contact your fitter.

5.4 Bleeding the heating system

It is essential that you vent any air in the appliance, the ducts or the

valves to prevent the noise annoyance likely to be produced during

heating or water draw-off. To do this, proceed as follows:

1. Open the valves on all radiators connected to the heating system.

T000850-A

T000853-A

12

3

4

T000181-B


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2. Set the room thermostat as high as possible.

3. Wait until the radiators are hot.

4. Delete the request for central heating and DHW.

5. Check that the output generated is 0 W (Press the key several

times).

6. If the output generated is 0 W: Switch off the power in an

appropriate manner.

7. Wait around 10 minutes until the radiators are cold.

8. Bleed the radiators. Start with the lower floors.

T001287-B

Boiler temp

State burner 1+2

T000184-A

T900057-A

T000185-A

T000854-A

3

1

4

5

2

5. Checking and maintenance eVita 25s - 28c


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9. Open the bleed connection using the bleed key provided whilst

keeping a rag pressed against the connection.

10.Wait until water comes out of the bleed valve and then close the

bleed connection.

CAUTION

The water may still be hot.

11.Switch on the boiler. A vent cycle of a duration of around 3 minutes

is carried out automatically.

12.After venting, check whether the pressure in the installation is still

sufficient.

If the water pressure is lower than 0.8 bar, more watershould be added. If necessary, top up the water level in the

heating system (recommended hydraulic pressure

between 1.5 and 2.0 bar).

See chapter: "Filling the system", page 18.

13.Set the room thermostat or the regulator

Refer to the user instructions: eVita programmable

thermostat.

T000217-A

T000218-A

T001288-B

Boiler temp

Ruimtetemperatuur

1+2


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6 Troubleshooting

6.1 Error codes

The boiler is fitted with an electronic regulation and control unit. When

a failure is signalled, the boiler stops or becomes locked. One of the

following messages is displayed on the screen:

The screen displays and a blockage code:

1. Press the 3key ; The error code and an associated explanatorytext appear on the display.

2. The boiler controller performs an automatic reset.

The screen displays and at the same time as an error

code:

1. Press the 3key ; The error code and an associated explanatorytext appear on the display.

2. Press the 3key a second time ; The display indicates the type ofreset required (A service reset or a user reset).

A service reset must be carried out by the installer. Call

your fitter.

eVita 25s - 28c 6. Troubleshooting

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6.1.1. User reset

Use the boiler control panel to carry out the reset.

1. Press the reset key.

2. The screen displays Reset end userand No(flashing).

3. Turn thekcontrol knob within 8 seconds toYes.

4. Press the OKkey to confirm the setting.

5. The screen displays Reset end userand Value adopted.

If the error code disappears, this signifies that the boiler is

again functioning normally. If the error code continues to

display, search for the cause in the error table and apply

the solution. If you are unable to eliminate the breakdown,

contact your installer:

Note the error code displayed.

T000568-04-A

Boiler tempState burner

313:Dry fire function

Boiler temp

Reset enduser

Bedieneenheid No

Boiler temp

Reset enduser

Bedieneenheid Yes

Boiler temp

Reset enduser

Value adopted Yes

6. Troubleshooting eVita 25s - 28c


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6.1.2. Description of error codes

Error code

Display screen

Probable causes Checking / solution

127

Legionella temp

4 Air in the heating circuit

4 Not enough water in the

installation

4 Degas the installation (If necessary)

4 Check the water pressure in the heating system:

Insufficient pressure: add water (1.5 - 2 bar)

157

Boiler flow thermostat

158

Condensate

164

Flow press switch HC

270

Exc temp diff h' exch

274

Protection against heating

if there is insufficient water

in the installation275

Zero flow aft deaer

276

Zero flow

277

Zero flow DHW

278

Max temp rise

261

Loss of flame Eng bu

Insufficient gas supply Check that the gas valve is fully opened

262

Loss of fl' Supp bu424

Rep loss flame Eng bu

425

Rep. loss of fl' Supp bu

6.1.3. Other error codes

If another error code is displayed, contact the installer. Before

contacting the installer, make a note of the following information:

4 Error code

4 Type of gas used

4 Boiler type

4 Manufacturing date

4 Serial no. of the appliance

This information can be found on the data plate affixed to the top of

the boiler.

T001292-D

eVita 25s - 28c 6. Troubleshooting

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Problem Probable causes Solution

There is no domestic hot water.

The boiler is not switched on.

Check that the boiler is switched on.

Check the fuses and switches. Check that the gas valve is fully opened.

The DHW mode is deactivated. Activate the DHW mode.

The water pressure is too low (

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7202719-04 User GB..pdf