Viessmann Vitodens 300 Istruzioni operative

VIESMANN

Service instructions

for heating engineers

Vitodens 300

Type WB3A, 4.2 to 13.0 kW

Wall mounted gas fired condensing boiler

Natural gas and LPG version

For applicability, see the last page

VITODENS 300

5692 569 GB 1/2005 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.

!Please note

This symbol warns against the

risk of material losses and

environmental pollution.

Note

Details identified by the word "Note"

contain additional information.

Warranty

Non-observation of our service

instructions will void all warranty

rights.

Target group

These service instructions are exclu-

sively designed for qualified person-

nel.

Work on gas appliances must only be

carried out by a qualified gas fitter.

Only recognised contractors may con-

vert this boiler for use in countries

other than those stated on the type

plate. That contractor must also

arrange the acceptance in accor-

dance with the statutes of that coun-

try.

Work on electrical equipment must

only be carried out by a qualified elec-

trician.

The system must be commissioned by

the system installer or a qualified per-

son authorised by the installer.

Regulations

Observe the following when servicing

the equipment:

&all legal instructions regarding the

prevention of accidents,

&the TRGI, TRF and any special

requirements, or local regulations

&all legal instructions regarding

environmental protection,

&the Code of Practice of relevant

trade associations.

If you smell gas

Danger

Escaping gas can lead to

explosions which may lead to

serious injury.

&Never smoke. Prevent naked

flames and sparks.

&Never switch lights or electri-

cal appliances ON or OFF.

&Open windows and doors.

&Close the gas shut-off valve.

&Remove all people from the

danger zone.

&Observe the safety regula-

tions of your local gas sup-

plier, found on the gas meter.

&Notify your contractor from

outside the building.

Safety instructions

5692 569 GB

If you smell flue gas

Danger

Flue gas can lead to life-threa-

tening poisoning.

&Shut down the heating sys-

tem.

&Ventilate the boiler room.

&Close doors to the living

space.

Repair work

on parts that fulfil a safety function is

not permitted.

Use only original Viessmann spare

parts, or equivalent parts that have

been approved by Viessmann.

Service work on the heating system

&Isolate the system from the power

supply and check that it is no longer

'live', e.g. by removing a separate

fuse or by means of a mains isola-

tor.

&Safeguard the system against

unauthorised reconnection.

&When using gas as fuel, also close

the main gas shut-off valve and

safeguard against unauthorised

reopening.

Ancillary components, spare and

wearing parts

!Please note

Components which are not

tested with the heating system,

the installation of non-

approved spare parts and un-

authorised conversions may

lead to damage on the heating

system, or may affect its func-

tion and void all warranties.

For conversions or replace-

ments, use only original spare

parts supplied or approved by

Viessmann.

Safety instructions (cont.)

Safety instructions

5692 569 GB

Initial start-up, inspection, maintenance

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

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

Coding

Code 1........................................................................................................ 39

Code 2........................................................................................................ 42

Resetting codes to the delivered condition ................................................. 61

Service scans

Service level overview ................................................................................ 63

Temperatures, boiler coding card and brief scans ....................................... 63

Checking outputs (relay test) ...................................................................... 67

Scanning operating conditions and sensors ................................................ 69

Troubleshooting

Fault display ............................................................................................... 72

Calling up fault codes from the fault memory (fault history) .......................... 73

Fault codes................................................................................................. 74

Repairs ...................................................................................................... 83

Function description

Constant temperature control unit ............................................................... 93

Weather–compensated control unit............................................................. 94

Extensions for external connections (accessories) ...................................... 96

Control functions ........................................................................................ 100

Electronic combustion control unit............................................................... 105

Designs

Connection and wiring diagrams –internal connections .............................. 106

Connection and wiring diagrams –external connections.............................. 107

Parts lists .................................................................................................. 109

Specification............................................................................................. 122

Certificates

Declaration of conformity ............................................................................ 123

Manufacturer's certificate according to the 1st BImSchV [Germany]............. 124

Keyword index .......................................................................................... 125

Index

5692 569 GB

For further information regarding individual steps, see the pages indicated.

Commissioning steps

Inspection steps

Maintenance steps Page

!!!



•01. Filling the heating system ................................................. 7

•02. Venting the boiler .................................................................. 8

•03. Venting the heating system............................................... 8

•04. Filling the siphon with water............................................. 9

•05. Checking the power supply connection

•06. Selecting the language (if required) - only for

weather-compensated control units ............................. 9

• • 07. Setting the time and date (if required) –only for

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

• • 08. Checking the gas type......................................................... 10

•09. Changing the gas type (only for operation with

LPG) ........................................................................................... 11

••• 10. Function sequence and possible faults ....................... 11

••• 11. Checking the static and supply pressure .................... 13

••• 12. Checking the combustion quality................................... 15

•13. Setting the maximum output ........................................... 16

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

side for leaks

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

116 of the commissioning report)

•16. Checking the balanced flue system for soundness

(annular gap check) ............................................................. 17

• • 17. Removing the burner and checking the burner

gasket (replace gasket every two years)...................... 18

• • 18. Checking the burner gauze assembly........................... 19

• • 19. Checking and adjusting the ignition and ionisation

electrodes ................................................................................ 20

Steps –initial start-up, inspection and maintenance

Initial start-up, inspection, maintenance

5692 569 GB

Commissioning steps

Inspection steps

Maintenance steps Page

!!!



• • 20. Cleaning the combustion chamber/heating

surfaces and fitting the burner ........................................ 21

• • 21. Checking the condensate drain and cleaning the

siphon........................................................................................ 22

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

• • 23. Checking the diaphragm expansion vessel and

system pressure.................................................................... 22

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

••• 25. Checking the tightness of electrical connections

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

operating pressure .............................................................. 23

••• 27. Checking the ionisation current ..................................... 24

••• 28. Checking external LPG safety valve (if required)

•29. Matching the control unit to the heating system ...... 25

•30. Connecting the weather-compensated control unit

into the LON system (e.g. with the Vitotronic 050) . . . 31

•31. Implementing a user check (in conjunction with

the LON system) .................................................................... 32

•32. Adjusting the heating curve (only for weather-

compensated control units).............................................. 33

•33. Instructing the system user .............................................. 37

•34. Scanning and resetting the "Maintenance" display 37

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

Initial start-up, inspection, maintenance

5692 569 GB

Filling the heating system

!Please note

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 it with water.

&Only use fill water of potable quality.

&Soften fill water harder than 3.58 mmol/l.

&An anti-freeze additive suitable for heating systems can be mixed with

the fill water.

1. Check the inlet pressure of the dia-

phragm expansion vessel.

2. Close the gas shut-off valve.

3. Drain the heating system via boiler

fill & drain valve A(minimum sys-

tem pressure >0.8 bar).

Note

&If the control unit had not already

been switched ON before filling

began: The diverter valve is in its

central position, and the system

will be completely filled.

&If the control unit had already

been switched ON before filling

began: In code 1, set coding

address "2F:2" (see page 39).

&At this point, the diverter valve is

in its central position.

&Whilst the filling program runs,

the display shows "bF" (constant

temperature control unit) or

"Filling" (weather-compensated

control unit).

4. Close boiler fill & drain valve A.

5. Set coding address "2F:0".

Further details regarding the individual steps

Initial start-up, inspection, maintenance

5692 569 GB

Venting the boiler

1. Close the shut-off valves on the

heating water side.

2. Connect the drain hose between

top valve Band a drain outlet.

3. Open valves Aand B, and vent

at mains pressure until no sound of

escaping air can be heard.

4. Close valves Aand Band open

the primary shut-off valves.

Venting the heating system

1. Close the gas shut-off valve and

switch ON the control unit.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 569 GB

2. Activate the venting program via

coding address "2F:1".

Note

To call up code 1 and for setting the

coding address, see page 39.

For function and sequence of the

venting program, see page 101.

Whilst the venting program runs,

the display shows "EL" (constant

temperature control unit) or

"Venting" (weather-compensated

control unit).

3. Check the system pressure.

Filling the siphon with water

1. Remove the retaining clip and

siphon A.

2. Fill the siphon with water.

3. Fit siphon Aand secure with the

retaining clip.

Selecting the language (if required) - only for weather-com-

pensated control units

1. Press c.

The display shows "Select heating

circuit".

2. Press d.

3. After approx. 4 s press c.

4. Select the required language with

5. Confirm with d.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 569 GB

Setting the time and date (if required) –only for weather-

compensated control units

Note

During commissioning, or after prolonged time out of use, it may be necessary

to set the time and date, if the time flashes in the display.

1. Set the correct time with a/b.

2. Confirm with d.

3. Set the current date with a/b.

4. Confirm with d.

Checking the gas type

The boiler is equipped with an electronic combustion control unit, which adjusts

the burner for optimum combustion in accordance with the prevailing gas qual-

ity.

&For natural gas, there is consequently no adjustment required across the

entire Wobbe range.

&The boiler can be operated in the Wobbe index range 10.0 to 16.1 kWh/m

(36.0 to 58.0 MJ/m

&The burner must be adjusted for operation with LPG (see "Changing the gas

type" on page 11).

1. Determine the gas type and Wobbe

index (Wo) by asking your local

mains gas or LPG supplier.

2. Convert the burner for operation

with LPG (see page 10).

3. Record the gas type in the service

report on page 116.

Further details regarding the individual steps (cont.)

Initial start-up, inspection, maintenance

5692 569 GB

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