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35
4
MFA
X1:
N
1
N
2
N
3
N
L
4
5
6
eBus
THR
TPU
VRA
PFK
TFK
PFK
TFK
TPU
M
M
THR
VRA
TPO
TPO
TV
AB
B
A
X2:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
•
Heating return temperature increase
The WRSol 2.0 compares the solid fuel boiler temperature
(TFK) with the calorifier temperature (TPU).
If the average temperature differential is greater than the
value set (
Solid fuel Diff. On
) the pump is switched
on, if the predetermined minimum temperature (
Solid
fuel Temp. Minimum
) is reached at the same time.
The speed of the temperature increase can also lead to the
pump starting (
➭
Ch. 7.7).
The thermal mixer valve (TV) enables fast heat up of the
solid fuel boiler.
Using the three way valve for return temperature increase
(VRA) the available energy from the calorifier can be
utilised depending on the calorifier temperature (TPO) and
the heating return sensor (THR).
Depending on the average speed of the solid fuel boiler
pump and the reduced calorifier temperature (see
parameter
Diff. Calorifier Min
), an external heat
exchanger can be blocked via the potential free
multi-function output (MFA). Blocking also occurs, if the
Calorifier Temp. Setpoint
is exceeded and is
unblocked if the temperature falls by 5K.
Possible settings MFA output:
0, 9, 10, 11, 12
Variation 49: Calorifier for heating support with solid fuel boiler
MFA
X1:
N
1
N
2
N
3
N
4
5
6
eBus
TKO
PS
PS2
PS
PS2
TK2
TSU
TSO
TPU
TPO
PPS
TPO
TPU
TSO
TSU
TK2
TKO
PPS
PWL*
PWL*
X2:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
•
Retrieval function
The WRSol 2.0 determines the temperature differential
between the collector sensor (TKO) and the reference
sensor (TSU) for the dual stratification storage tank. The
temperature differential between the second collector
sensor (TK2) and the reference sensor (TPU) is also
determined for the calorifier.
Depending on the temperature differential determined the
pumps (PS / PS2) are started.
With pump reloading calorifier-tank (PPS) the energy
stored in the calorifier is transferred depending on the
storage tank temperature top (TSO) and the calorifier
temperature top (TPO (
➭
Ch. 7.18).
Depending on the average pump speed and the minimum
storage tank temperature, the external heat exchanger can
be blocked via the potential free
Multi-funct. Output
(MFA).
In addition an 18 hour block can be activated.
The DHW function (
➭
Ch. 7.14) can also influence the MFA
output.
Possible settings MFA output:
0, 1, 2, 5, 6, 7, 8, 9, 10, 11, 12
Variation 50: Dual storage tank switching for DHW with separate collectors and retrieval function
WW
KW
* optional