Viessmann Vitodens 242-F Operations Instructions download pdf (Page 47)

Checking the combustion quality

The electronic combustion control unit automatically ensures an optimum combustion

quality. Only the combustion values need to be checked during commissioning and

maintenance. For this, check the CO

or O

content. For a function description of the

electronic combustion control unit, see page 119.

Please note

To prevent operating faults and equipment damage,

never operate with dirty combustion air.

or O

content

■ The CO

content must be within the following ranges (upper and lower output):

– 7.7 to 9.2% for natural gas H

– 9.3 to 10.9% for LPG P

■ For all gas types, the O

content must be between 4.4% and 6.9%.

If the actual CO

or O

values lie outside their respective ranges, proceed with the

following steps:

■ Check the balanced flue system for tightness, see page 34.

■ Check the ionisation electrode and connecting cable, see page 37.

Note

During commissioning, the combustion control unit carries out an automatic calibra-

tion. Only test the emissions approx. 30 s after the burner has started.

1. Connect a flue gas analyser at flue

gas port

on the boiler flue con-

nection.

2. Open the gas shut-off valve, start the

boiler and create a heat demand.

3. Select the lower output (see

page 48).

4. Check the CO

content. Should the

actual value deviate from the above

ranges by more than 1%, implement

steps from page 47.

5. Enter actual values into the service

report.

6. Select the upper output (see

page 48).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5418 193 GB

Service

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Viessmann Vitodens 242-F Operations Instructions Page 47

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