Viessmann VITODENS 200-W Service Instructions Manual page 127

Control functions
External demand
The "External demand" function is con-
nected via extension EA1. There are 3
inputs available at extension EA1 (DE1
to DE3).
External demand
Input DE1
Input DE2
Input DE3
The effect on the internal circulation
pump is selected with code 3F.
The effect on the relevant heating circuit
pump is selected with code d7.
Venting program
During the venting program, the circula-
tion pump will be alternately switched
ON and OFF for 30 s respectively over a
period of 20 min.
Screed drying function
The screed function enables screeds to
be dried. For this, always observe the
details specified by the screed manufac-
turer.
When the screed drying function is acti-
vated, the heating circuit pump of the
mixer circuit is switched ON and the flow
temperature will be held in accordance
with the selected profile. After comple-
tion (30 days), the mixer circuit will again
be regulated automatically via the set
parameters.
Observe EN 1264. The report to be pro-
vided by the heating contractor must
contain the following heat-up details:
(cont.)
The function is selected via the following
codes:
The minimum set boiler water tempera-
ture in case of external demand is selec-
ted in coding address "9b".
The burner is switched OFF during the
venting program.
Activate venting program: See "Venting
the heating system".
■ Heat-up data with respective flow tem-
peratures
■ Max. flow temperature achieved
■ Operating conditions and outside tem-
perature during handover
The various temperature profiles are
adjustable via coding address "F1".
The function continues after power fail-
ure or after the control unit has been
switched OFF. "Heating and DHW" will
be started after the screed drying func-
tion has been terminated or if code
"F1:0" is manually adjusted.
Function description
Code
3A:2
3b:2
3C:2
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