9.6.2
Changing the ΔT setting
The ΔT is factory set to 25 °C. It can be increased by a De Dietrich service
technician. Contact De Dietrich for more information.
Important
When increasing the ΔT, the control unit limits the flow
temperature to a maximum of 80 °C.
9.6.3
Screed drying
The screed drying function is used to force a constant flow temperature or
a series of successive temperature levels to accelerate screed drying on
underfloor heating.
Important
The settings for these temperatures must follow the screed
layer's recommendations.
Activation of this function via the parameter CP470 forces the
permanent display of the screed drying function and deactivates
all other regulator functions.
When the screed drying function is active on one circuit, all
other circuits and the domestic hot water circuit continue to run.
It is possible to use the screed drying function on circuits A and
B. The parameter settings must be made on the PCB that
controls the circuit concerned.
Fig.98
Screed drying curve
AD-3001406-01
0
20
35
50
T
0:00
0:00
0:00
0:00
0:00
0:00
0:00
d
0:00
0:00
0:00
0:00
0:00
0:00
10
9
8
7
6
5
4
3
2
1
x
x
2
3
4
5
1
d Number of days
T Heating set point temperature
1 Number of days on which the screed drying function
is activated (parameter CP470)
2 Screed drying start temperature (parameter CP480)
3 Screed drying stop temperature (parameter CP490)
4 Start of the screed drying function
5 End of the screed drying function, back to normal
running
Important
Every day at midnight, the screed drying start temperature set
point is recalculated and the remaining number of days on which
the screed drying function is running decreases.
9.6.4
Cascade control
The appliance has the ability to control up to 7 appliances in cascade. The
system sensor is connected to the master appliance. All the appliances in
cascade are connected by an S-BUS cable. The appliances in cascade
are automatically numbered.
9 Installer instructions
7762666 - v.02 - 29092020
C 340 / C 640
85
