Viessmann Vitodens 300 Service Instructions Manual page 33

Further details regarding the individual steps
A Consecutive list number
B User number
Adjusting heating curves (only for weather-compensated
control units)
The heating curves illustrate the rela-
tionship between the outside tem-
perature and the boiler water or the
flow temperature. To put it simply: the
lower the outside temperature, the
higher the boiler water or flow tem-
perature. The room temperature,
again, depends on the boiler water or
the flow temperature.
Initial start-up, inspection, maintenance
(cont.)
1. Press L and d simultaneously
for approx. 2 seconds. User check
initiated.
2. Select the required user with a
and b.
3. Activate checking with d.
"Check" flashes until its comple-
tion. The display and all key illumi-
nations of the selected user flash
for approx. 60 seconds.
&
"Check OK" flashes during com-
munication between both
devices.
&
"Check not OK" flashes if there
is no communication between
both devices. Check LON con-
nection.
4. For checking further users, proceed
as for items 2 and 3.
5. Press L and d simultaneously
for approx. 1 second. User check
completed.
Settings in the delivered condition:
&
Slope = 1.4
&
Level = 0
Generally, the slope of the heating
curve lies
in the range of A for underfloor
&
heating systems,
in the range of B for low tempera-
&
ture heating systems (according to
the Energy Savings Order [Ger-
many]).
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