Screed Drying - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Function description
Control functions
(cont.)
90
3.5
A
+20
Outside temperature in °C
Fig. 58
Changing the slope
A
Changing the level (vertical parallel offset of the
B
heating curve)
Raising the flow temperature of the heating cir-
cuits during operation with room temperature
hook-up
The higher the value, the greater the influence of the
room temperature on the set flow temperature of the
heating circuit.

Screed drying

When enabling screed drying, observe the information
provided by the screed manufacturer.
When screed drying is activated, the heating circuit
pumps of all heating circuits are switched on and the
flow temperature is maintained at the set profile. After
completion (30 days), the heating circuits with mixer
are automatically controlled with the set parameters.
Note
During screed drying, DHW heating is not available.
Observe EN 1264. The report to be provided by the
heating contractor must contain the following details
regarding heat-up:
Heat-up data with the relevant set flow temperatures
■
Max. flow temperature achieved.
■
Operating state and outside temperature at handover
■
100
1.4
B
0.2
-20
Room influence factor parameter
Heating circuit
1 (without mixer)
2 (with mixer)
3 (with mixer)
4 (with mixer)
Example for determining the increase in the flow tem-
perature using the value of the heating curve when the
actual room temperature deviates from the set room
temperature:
Set room temperature = 20.0 °C
■
Actual room temperature = 18.0 °C
■
■ Heating curve slope =1.4
■ Room influence factor = 8 (delivered condition)
Determining the increase in flow temperature
(RT set - RT actual) x (1 + slope) x room influence fac-
tor/4 = raising the flow temperature via heating curve
value
(20 - 18) x (1 + 1.4) x 8/4 = 9.6
Increase in flow temperature via heating curve value
= 9.6 K
Different temperature profiles can be set via parameter
897.0.
Note
Temperature profile 6 ends after 21 days.
The function continues after a power failure or after the
control unit has been switched off. When screed drying
has completed or been manually switched off, the sys-
tem is regulated in accordance with the selected
parameters.
Parameter
933.7 (not assigned)
934.7
935.7
936.7