Checking The Gas Type; Function Sequence And Possible Faults - Viessmann VITODENS 200-W WB2B Service Instructions For Contractors

Commissioning, inspection, maintenance
Further details regarding the individual steps
3. c press this button again,
"Außentemperatur" (outside
temperature) is displayed.

Checking the gas type

The boiler is equipped with an electronic combustion control unit that adjusts
the burner for optimum combustion in accordance with the prevailing gas qual-
ity.
The boiler can be operated with natural gas in the Wobbe index range 10.0 to
3
16.1 kWh/m (36.0 to 58.0 MJ/m
1. Determine the gas type and Wobbe
index from your gas supply utility.
Wobbe index ranges
Gas type
Delivered condition
Natural gas E
or
Natural gas LL

Function sequence and possible faults

Control unit is-
sues heat de-
mand
Yes
Fan starts
12
4. b for the required language.
5. d to confirm.
3
) without conversion.
2. Record the gas type in the service
report on page 112.
Wobbe index range
3
kWh/m
12.0 to 16.1
10.0 to 13.1
Display screen
No
after approx. 51 s
No
fault F9
(cont.)
3
MJ/m
43.2 to 58.0
36.0 to 47.2
Measures
Increase set
value and ensure
heat is drawn off
Check the fan, fan
connecting
cables, power at
the fan and fan
control