Operating instructions

52
7
For this type of regulation, the de-couple sensor
(NTC 5kΩ, Order No.: 660 228) has to be connected to
input B11.
Heating operation:
The WTC controls the modulation in the heating
operation directly with the de-couple sensor.
Switch on criteria for the WTC:
B11 < (system setpoint – hysteresis)
Switch off criteria for the WTC:
B11 > (system setpoint – hysteresis)
Note: The hysteresis can be set in the heating
engineer level under parameter P32.
Volume flow control:
Due to the temperature difference between the
de-couple sensor (B11) and the flow temperature
sensor, the PWM pump integrated into the unit adapts its
rating to the hydraulic conditions. Parameter P44 is used
for setting (control difference).
DHW operation:
With DHW operation, the modulation control is carried
out via the internal flow sensor. Consequently the
hydraulic alignment of the DHW circuit before the
de-couple using a 3 way valve is also possible.
DHW operation is completed with a pump run on of
3 minutes.
7.4.7 Regulation with hydraulic de-couple
P3
Sensor connection variation P3
1
2
3
0
V
2
2
3
0
V
3
H
1
4
H
2
5
M
F
A
6
V
A
7
e
B
U
S
8
B
1
1
9
B
1
Prerequisites:
•Unit version with integrated PWM pump
• De-couple sensor (B11) installed
Direct pump heating circuit after de-couple
1. With WCM-FS #1 or #1+2:
Programming WCM-CPU:
Pump on MFA P13 = 7
Pump on VA P14 = 7
2. With WCM-DU:
Programming WCM-CPU:
Input H1 P15 = 1
Pump on MFA P13 = 3
Pump on VA P14 = 3
Operation of circulation pump
1. With WCM-FS #1 or #1+2:
Programming WCM-CPU:
Pump on MFA P13 = 6
Pump on VA P14 = 6
2. With WCM-DU:
Programming WCM-CPU:
Input H2 P17 = 1
Pump on MFA P13 = 5
Pump on VA P14 = 5