78
7
7.2 Energy management with MFA output
The multi-function output (potential free contact, terminal
5/6) must be selected site specific.
With storage tank operation (DHW), reference sensor
TSU
•
With good solar yield (
a
av
ve
er
ra
ag
ge
e
r
ra
at
ti
in
ng
g
P
PS
S
above
50%) and storage tank temperature greater than
T
Ta
an
nk
k
t
te
em
mp
p.
.
m
mi
in
ni
im
mu
um
m
burner interlock is activated.
If the requirements are no longer met, the interlock is
deactivated.
•
With very good solar yield (
a
av
ve
er
ra
ag
ge
e
r
ra
at
ti
in
ng
g
P
PS
S
above 80%) the burner interlock is activated for 18
hours once the
T
Ta
an
nk
k
t
te
em
mp
p.
.
s
se
et
tp
po
oi
in
nt
t
has been
achieved.
If the storage tank temperature fall below its minimum tem-
perature (
T
Ta
an
nk
k
t
te
em
mp
p.
.
m
mi
in
ni
im
mu
um
m
) by 3K the interlock is
deactivated and the 18 hours are reset.
With calorifier operation, reference sensor TPU
•
With good solar yield (
a
av
ve
er
ra
ag
ge
e
r
ra
at
ti
in
ng
g
P
PS
S
above
50%) the
C
Ca
al
lo
or
ri
if
fi
ie
er
r
t
te
em
mp
p.
.
s
se
et
tp
po
oi
in
nt
t
is reduced
by
D
Di
if
ff
f.
.
c
ca
al
lo
or
ri
if
fi
ie
er
r
m
mi
in
ni
im
mu
um
m
.
If the actual temperature of the calorifier reaches this
reduced value the interlock is activated.
If the actual calorifier temperature falls below the
reduced value or if the
A
Av
ve
er
ra
ag
ge
e
r
ra
at
ti
in
ng
g
P
PS
S
falls to
below 50% the interlock is deactivated.
Setting value
Heat exchanger
Special temp. level
Heat exchanger
Additional
Interlock / Release
Heat exchanger for
Interlock / Release
Tank loading
Legionella function
Calorifier loading
functions
0
1
Interlock
2
Release
3
Interlock
4
Release
5
Interlock
6
Release
7
Interlock
Interlock
8
Release
Release
9
Lockout
10
No lockout
11
High temperature
relief
12
High temperature
relief inverse
3. High temperature relief: cooling via MFA
This function allows cooling of the tank or calorifier during
the day via an additional cooling circuit. To do this, a pump
for example would need to be fitted to the MFA output
which would discharge the excess energy.
If the temperature at sensor TSO exceeds the “Tank Temp.
Maximum” or at sensor TPU exceeds the “Calorifier Temp.
Maximum” the MFA output is activated.
Setting:
Multi funct. output 11: Relay contact of MFA output on
terminal 5/6 is closed, when the
cooling function is activated.
Multi funct. output 12: Inverse activation
To stop the solar pump from switching off when the
Tank or Calorifier Temp. Maximum is reached, the overheat
protection must be set to setting 1, 3 or 5 under options
for this function.
The table describes the required functions with the relay
contact closed.
In conjunction with
WTC-WCM
control and
connection to H1 or H2 with parameter setting “Heating
circuit release” or “DHW release” the even setting values
are required.
In conjunction with
WTU-WRS
control and connection
to H1 with parameter setting “Boiler interlock” the odd
setting values are required.
