0020308121_04 Installation and maintenance instructions 43
Underfloor heating systems
Heating system with radiators and
decentralised underfloor heating
Decoupling of the heat generator
from the heating system (low loss
header, plate heat exchanger, buffer
cylinder)
▶ Select parameter D.170 and, if required, D.171 to D.175
in order to adjust the hydraulic operating mode of the
heat generator to the heating installation. (→ Section 8.3)
10.3.6 Setting the pressure level for supplying the
heating system
The heating system is supplied via the pump pressure, this
results in a volume flow. The pump pressure setting is signi-
ficant. Diagnostics code D.170 can be used to set the pump
control type. (→ Section 10.3.5) The standard selection is
"constant pressure". The correct pump pressure is selected
via diagnostics code D.171 and not mechanically at the cir-
culation valve.
400
300
200
100
0 600200 400 800 1000 1400 16001200
B
A
2
3
1
D.1 71
A Pressure [mbar]
B Flow rate [l/h]
1 Maximum pressure
2 Factory setting
3 Minimum pressure
▶ Set the pressure level via D.171. (→ Section 8.3)
You should only change the circulation valve setting if the
setting of the maximum pump pressure under D.171 has not
led to the ideal supply of the heating system.
▶ If D.171 is set to 400 mbar and the heat supply is still not
sufficient, readjust the pressure via the circulation valve.
▶ Remove the front casing. (→ Section 7.10.2)
▶ Hinge the electronics box downwards.
▶
Regulate the pressure at the circulation valve (1) in a
clockwise direction.
Position of the
adjusting screw
Pressure Comment
Right-hand stop
(turned all the way
down)
0.035 MPa
(0.350 bar)
If the radiators
do not heat up
sufficiently at the
factory setting.
▶ Hinge the electronics box upwards.
▶ Install the front casing. (→ Section 7.11)
10.3.7 Pump curves
400
300
200
100
0
600200 400 800 1000 1400 16001200
B
A
2
3
1
A Pressure [mbar]
1 Minimum pressure
2 Maximum pressure
B Flow rate [l/h]
3 Factory setting
Underfloor heating
Direct supply is only possible via the internal heating pump.
However, carefully check the potential of the internal heating
pump.
Underfloor heating systems are heating surfaces with a low
spread and, therefore, a high demand for cycles. The lar-
ger the cycle, the higher the pressure loss. The potential of
the internal heating pump for such systems is limited. If the
potential of the internal heating pump is not sufficient, the
heat generator must be decoupled from the heating surfaces
(e.g. using a low loss header, heat exchanger, buffer cylin-
der, etc.). Beyond the decoupling, an external heating pump
can be designed exactly for the application.
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