Viessmann Vitocrossal 200 Series Service Instructions Manual page 38

Burner control unit
Burner control unit VUC 310
Sub-menu Parameter
point
9 Boiler controller start hysteresis (effec-
tive during minimum pause)
A Boiler controller stop hysteresis (effec-
tive during minimum pause)
0 Reset all operating parameters to their
delivered condition.
Example: to set the maximum operational output of the
burner to between 70 and 100 %, press the following
keys:
1. S longer than 2 s, " " flashes.
2. until "6" is shown under Service.
3. S "6" is displayed under Status.
Resetting operating parameters to their delivered condition
1. S longer than 2 s, " " flashes.
2. until "6" is shown under "Service".
3. S to confirm; "6" is shown under "Status". "1" is
shown under "Service".
4. until "0" is shown under "Service".
Manual operation and service display
The modulation level can be temporarily adjusted for
carrying out tests and settings on the gas train, e.g.
setting the max. heating output range.
During this manual operation the demands from the
Vitotronic control unit have no effect.
To call up the service display the burner must be run-
ning.
Press the following keys:
1. +S simultaneously for longer than 2 s.
The burner switches to manual mode. "P" is
shown under "Status". The current modula-
tion level flashes under "Service".
38
(cont.)
Setting range/unit
0 to 20 K
0 to 20 K
4. S
5. /
6. S
7. S
5. S "1" is shown under "Status" and "dEL" under
6. S to confirm. If reset successfully, "1" is shown
7. S to change to the operating display.
2.
3.
4. +S simultaneously for longer than 2 s.
Delivered condition
6 K
6 K
"1" is shown under Status and the current value
for the maximum operational output in % is
shown under Service.
for required maximum operational output.
to confirm. If adopted successfully, "1" appears
under Service; if it failed, "0" will appear.
to change to the operating display.
"Service".
under Service; if it failed, "0" is shown.
until the required lower heating output is
shown under "Service", e.g. "0" for minimal
lower heating output.
Tests and settings for operation at the lower
heating output can now be carried out.
until the required upper heating output is
shown under "Service", e.g. "100" for maxi-
mum upper heating output.
Tests and settings for operation at the upper
heating output can now be carried out.
Manual operation is terminated.