Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual page 34

Burner control unit
Burner control unit VUC 310
Configurations:
Menu Description
point
5 Changeover from the operating display of
the burner control unit phase to other proc-
ess information
6 Configuration of control function operating
parameters
Menu point "5" is used to display the following process information:
Sub-menu point Process information
0 Phase
1 Boiler water temperature
2 Flue gas temperature
3 Ionisation current
4 Set speed
5 PWM variable
6 Actual speed
7 Gas pressure switch 1
8
Gas pressure switch 2
9 Air pressure switch
A Gas valve 1
B
Gas valve 2
Example: Displaying the ionisation current. Press the
following keys:
1. S longer than 2 s, " " flashes.
2. until "5" is shown under Service.
Menu point "6" is used to change the following operating parameters:
Sub-menu Parameter
point
1 Maximum operational output
2 Gas type
4 Max. boiler water temperature
5 Boiler controller integral threshold (effec-
tive with integral method, do not adjust)
6 Boiler controller runtime optimization (do
not adjust)
7 Motorised flue gas damper
8 Characteristics with gas pressure too
low
Not available for all boiler types.
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34
(cont.)
*1
*1
3. S "5" is displayed under Status.
4.
5. S "3" appears under Status. During operation, the
Setting range/unit
% of rated heating out-
put
0 = Natural gas
1 = LPG
5 to 127 °C
1 to 255 K x min
0 = Minimum pause
1 = Integral method
0 = without flue gas
1 = with flue gas
0 = interlocked
1 = blocked
Unit/scale
1
30
°C
°C
I in 1/10
μ
%
%
n in 10/min
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
until "3" is shown under Service.
ionisation current is shown under Service (e.g.
30 = 3.0 A).
µ
Delivered condition
100 %
0
*1
101 °C
60 K x min
1
0
damper
damper
1
A