Viessmann Vitodens 300 Istruzioni operative

VIESMANN

Service instructions

for heating engineers

Vitodens 300

Type WB3A, 6.6 to 35.0 kW

Gas fired wall mounted condensing boiler

natural gas and LPG version

See applicability on the last page

VITODENS 300

5692 537 GB 6/2004 Please keep safe

Please follow these safety instructions closely to prevent accidents and

material losses.

Safety instructions explained

Danger

This symbol warns against the

risk of injury.

!Important information

This symbol warns against the

risk of material losses and

environmental pollution.

Note

Details identified by the words "Note"

contain additional information.

Target group

These service instructions are exclu-

sively designed for qualified person-

nel.

&Work on gas equipment must only

be carried out by a registered gas

fitter.

&Electrical work must only be carried

out by a qualified electrician.

&The system must be commissioned

by the system installer or a qualified

person authorised by the installer.

Regulations

Observe the following during service

work:

&all legal instructions regarding the

prevention of accidents,

&all legal instructions regarding

environmental protection,

&the Code of Practice by relevant

trade associations and all local reg-

ulations.

&all current safety regulations as

defined by DIN, EN, DVGW, TRGI,

TRF, VDE and all locally applicable

standards.

If you notice a smell of gas

Danger

Escaping gas can cause explo-

sionswhichmayleadtoser-

ious injury.

&Do not smoke. Prevent

naked flames and sparks.

Never switch electrical lights

or equipment.

&Open windows and doors.

&Close the gas shut-off valve.

&Shut down the system.

&Remove all personnel from

the danger zone.

&Observe the safety regula-

tions of your local gas sup-

plier which can be found on

the gas meter.

If you smell flue gas

Danger

Flue gas may lead to life-threa-

tening poisoning.

&Shut down the heating sys-

tem.

&Ventilate the boiler room.

&Closealldoorsleadingtothe

living space.

Safety instructions

5692 537 GB

Service work on the heating system

&Isolate the system from mains sup-

ply, e.g. by removing a separate

fuse or by means of a mains electri-

cal isolator and check that it is no

longer 'live'.

&Safeguard the system against

unauthorised reconnection.

&When using gas as fuel, also close

the main gas shut-off valve and

safeguard against unauthorised

reopening.

Repair work

!Important information

Repairing components which

fulfil a safety function can com-

promise the safe operation of

your heating system.

Replace faulty components

only with original Viessmann

spare parts.

Ancillary components, spare and

wearing parts

!Important information

Components which are not

tested with the heating system,

the installation of non-

approved spare parts and

unauthorised conversion may

lead to damage to the heating

system, which may affect their

function and limit our warranty.

For conversions or replace-

ments, use only original spare

parts from Viessmann or those

which are approved by Viess-

mann.

Safety instructions (cont.)

Safety instructions

5692 537 GB

Initial start-up, inspection, maintenance

Steps - initial start-up, inspection and maintenance ..................................... 5

Further details regarding the individual steps .............................................. 7

Coding

Code 1........................................................................................................ 40

Code 2........................................................................................................ 43

Resetting the coding to the delivered condition ........................................... 63

Service scans

Service level summary................................................................................ 64

Temperatures, boiler coding card and brief scans ....................................... 65

Checking outputs (relay test) ...................................................................... 69

Scanning operating conditions and sensors ................................................ 71

Troubleshooting

Calling up fault code history ........................................................................ 74

Calling up current fault codes...................................................................... 74

Checking and acknowledging faults ............................................................ 76

Repairs ...................................................................................................... 85

Function description

Constant temperature control units ............................................................. 96

Weather-compensated control units ............................................................ 98

Extensions for external connections (accessory)......................................... 100

Control functions ........................................................................................ 104

Designs

Connection and wiring diagrams –internal connections............................... 109

Connection and wiring diagrams –external connections.............................. 111

Parts lists .................................................................................................. 113

Commissioning/service reports............................................................... 120

Specification............................................................................................. 126

Certificates

Declaration of conformity ............................................................................ 127

Manufacturer's certificate according to the 1st BImSchV [Germany]............. 128

Keyword index .......................................................................................... 129

Index

5692 537 GB

For further instructions on individual steps, see pages indicated

Commissioning steps

Inspection steps

Maintenance steps Page

!!!



•1. Filling the heating system ................................................. 7

•2. Venting the boiler.................................................................. 9

•3. Venting the heating system............................................... 10

•4. Filling the siphon with water............................................. 10

•5. Checking the electrical mains connection

•6. Language selection (if required) - only for the

weather-compensated control units.............................. 10

•• 7. Set the time and date (if required) - only for

weather-compensated control units.............................. 11

••8. Checking the gas type......................................................... 11

•9. Gas type conversion............................................................ 12

••• 10. Function sequence and possible faults ....................... 12

••• 11. Checking static and supply pressure ........................... 14

••• 12. Checking the CO2settings ................................................ 16

•13. Setting the max. output ...................................................... 18

••• 14. Checking all connections on the primary and DHW

side for leaks

••• 15. Checking the burner (recording values on

page 120 of commissioning report)

•16. Checking the balanced flue system for soundness

(annular gap check) ............................................................. 19

•• 17. Removing the burner and checking the burner

gasket (replace gasket every two years)...................... 20

•• 18. Checking the burner gauze assembly........................... 21

•• 19. Checking and adjusting the ignition and ionisation

electrodes ................................................................................ 22

•• 20. Cleaning the combustion chamber/heating

surfaces and installing the burner ................................. 23

Steps - initial start-up, inspection and maintenance

Initial start-up, inspection, maintenance

5692 537 GB

Commissioning steps

Inspection steps

Maintenance steps Page

!!!



•• 21. Checking the condensate drain and cleaning the

siphon........................................................................................ 24

•• 22. Checking the neutralising system (if installed)

•23. Flow limiter (only for gas combination boilers)......... 25

••• 24. Checking the diaphragm expansion vessel and

system pressure

••• 25. Checking the function of all safety valves

••• 26. Checking tightness of electrical connections

••• 27. Checking all gas equipment for soundness at

operating pressure............................................................... 25

••• 28. Checking the ionisation current ..................................... 26

••• 29. Checking the external LPG safety valve (if

installed)

•30. Matching the control unit to the heating system....... 27

•31. Connecting the control unit to the LON system

(only for weather-compensated control units) .......... 33

•32. Implementing a user check (in conjunction with

the LON system) .................................................................... 34

•33. Adjusting heating curves (only for weather-

compensated control units).............................................. 35

•34. Instructing the system user .............................................. 39

•35. Scanning and resetting the "Maintenance" display 39

Steps - initial start-up, inspection and maintenanc . . . (cont.)

Initial start-up, inspection, maintenance

5692 537 GB

Filling the heating system

1. Check the charge pressure of the

diaphragm expansion vessel.

2. Close the gas shut-off valve.

3. !Important information

Unsuitable fill water

increases the level of

deposits and corrosion and

may lead to boiler damage.

&Thoroughly flush the

entire heating system prior

to filling with water.

&Only use fill water of pota-

ble quality.

&Soften fill water harder

than 20 °dH (3.58 mmol/l).

&An anti-freeze additive

suitable for heating sys-

temscanbemixedwith

the fill water.

Fill the heating system via the boi-

ler fill & drain valve A.(minimum

system pressure > 0.8 bar).

Note

The diverter valve actuator will be

in the central position, and the sys-

tem will be completely filled, if the

control unit has not been switched

ON before the system was filled.

Further details regarding the individual steps

Initial start-up, inspection, maintenance

5692 537 GB

4. If the control unit had already been

switched ON before filling began:

Start the control unit and in code 1,

set coding address 2F:2.

The diverter valve will then be in its

central position.

Note

To call up code 1 and for setting the

coding address, see page 40.

Whilst filling is in progress, the dis-

play shows bF (constant tempera-

ture control units) or "Filling"

(weather-compensated control

units).

Continue filling the system.

5. Close the boiler fill & drain valve

6. Set coding address 2F:0.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 537 GB

Venting the boiler

1. Close the shut-off valves on the

heating water side.

2. Connect the drain hose on the

upper valve Bwithadrainoutlet.

3. Open valves Aand B,andvent

at mains pressure, until no sound of

escaping air can be heard.

4. Close valves Aand B, and open

the primary shut-off valves.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 537 GB

Venting the heating system

1. Close the gas shut-off valve and

start the control unit.

2. Activate the venting program via

coding address 2F:1.

Note

To call up code 1 and for setting the

coding address, see page 40.

For function and sequence of the

venting program, see page 105.

Whilst venting is in progress, the

display shows EL (constant tem-

perature control units) or "Venting"

(weather-compensated control

units).

3. Check the system pressure.

Filling the siphon with water

1. Remove the retaining clip and

siphon A.

2. Fillthesiphonwithwater.

3. Fit siphon Aandsecurewiththe

retaining clip.

Language selection (if required) - only for the weather-com-

pensated control units

1. Press c.

The display shows "Select heating

circuit".

2. Press d.

3. After approx. 4 seconds, press c.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 537 GB

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