TD SOLUS II:
Connection with boiler buffering
8
La
st
r
ev
is
ed
0
5/
20
0
9
3.4.2
One boiler, two heating circuits
See also diagram 0 on page 12.
3.4.2.1
Standard connection
The supply of the two heating circuits is fitted to the heating
supply connection.
3.4.2.2
Cascade connection
Two heating circuits with different temperature levels (e.g.
radiators and underfloor heating) can be connected as a
cascade. This way, solar heat is optimally used, which leads
to particularly good solar yields.
The requirement is that the radiator circuit is circulated con-
stantly when the floor circuit is in operation or that the boiler
controller can monitor two target temperatures at different
storage tank positions. See the technical documentation for
CONTROL 701
Heating
Circuit 1
60/50
Sup
Ret
HS
BS
Heating
Circuit 2
35/25
>30°C R1/2
<30°C R3
Example 3: Heating circuits 60/50 and 35/25
3.4.3
Two boilers, one or two heating circuits
See also the diagrams 0 on page 12 and 0, page 12.
Connection of each boiler return:
Assignment of the heating circuit returns
The heating circuit returns are connected as for a boiler
without a solid fuel boiler (see section 3.4.1).
3.4.4
Increased hot water requirement
If a volume greater than the maximum hot water standby
volume is required, the heating supply can be connected to
R1. The hot water sensor is then inserted into sensor sleeve
FH D (small buffer bottom)
3.4.5
Instantaneous water heaters with integrated switching
valve or with two integrated pumps
The hot water and heating supply are connected to one an-
other downstream of the instantaneous water heater for
instantaneous water heaters with integrated valve or a sec-
ond switching pump for hot water backup heating. Instanta-
neous water heaters without suitable control of the supply
temperature can be equipped with a throttle valve to reach
the required supply temperature for hot water backup heat-
ing.
Heating
Circuit
70/50
HW
Instantaneous
water heater
HS
>30°C R1/2
<30°C R3
BS
Otherwise, the connection is as described above.
Example 4: Instantaneous water heater with integrated
switching valve
3.4.6
Solid fuel boiler or low temperature boiler with
minimum return temperature
A thermostatic mixer guarantees a minimum return tem-
perature.
Boiler
Q < 80 kW
HS
>30°C R1/2
<30°C R3
BS
Example 5: Integration of a solid fuel boiler with return tem-
perature increase via thermostatic mixer
