Screed Drying - Viessmann VITODENS 200-W Installation And Service Instructions For Contractors

Appliance functions
Reduced room temperature
90
A
C
B
D
Fig. 60 Example 2: Adjusting the reduced set room
temperature from 5 °C to 14 °C
Flow temperature in °C
A
Outside temperature in °C
B
Set room temperature in °C
C
D Heating circuit pump "OFF"
Heating circuit pump "ON"
E
Changing the reduced set room temperature
Operating instructions
Changing the slope and level
Individually adjustable for each heating circuit.
90
3.5
A
+20
Outside temperature in °C
Fig. 61
Changing the slope
A
B Changing the level (vertical parallel offset of the
heating curve)

Screed drying

When enabling screed drying, observe the information
provided by the screed manufacturer.
(only Vitodens 200-W, type B2HF with 7 inch screen)
*2
(cont.)
-20
E
1.4
B
0.2
-20
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 flow temperature of the heat-
ing circuit.
Room influence factor parameter
Heating circuit
1 (without mixer)
2 (with mixer)
3 (with mixer)
4 (with mixer)
*2
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 (RT set)
■ Actual room temperature = 18.0 °C (RT actual)
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
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.
Function description
Parameter
933.7 (only set if just one
heating circuit is installed)
934.7
935.7
936.7
115