Viessmann VITODENS 300 WB3A, Service Instructions Manual

Page: 49 / 148

A
Consecutive list number
B
User number
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.
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. 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]).
Further details regarding the individual steps
(cont.)
33
Initial start-up, inspection, maintenance
56
92
550
GB