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System Layout 5
Vitodens 200 (up to model WB2 8-32) with...
– direct-connected heating circuit
– one heating circuit with system separation
AV
PRV
TPV
Y
Installation of different heating circuits...
H radiator heating circuit (high temperature
circuit)
H underfloor heating circuit with 3-way
mixing valve (low temperature circuit)
H DHW production
...with the following flow conditions
1. The flow rate (output) of the radiator
heating circuit is at least 30% greater than
that of the underfloor heating circuit.
2. The total flow rate of the two heating
circuits is less than the maximum possible
water flow rate of the Vitodens 200 boiler
(see following table).
I
M
~
Model No.
Max. flow rate
(GPM/ltr/h)
Vitodens 200,
WB2 6-24C
6.2/1400
WB2 6-24
6.2/1400
WB2 8-32
7.0/1600
The use of a low-loss header is strongly
recommended if the maximum water flow
rate in the application concerned exceeds
the values shown in the preceding table, or
if the system flow rates are unknown.
The low-loss header is available as
accessory part.
See preceding pages for installation
examples with a low-loss header.
See page 29 in this manual for details on
the low-loss header.
Installation Examples
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief
valve
Vitodens 200 gas-fired condensing
boiler with Comfortrol programming
unit for weather-responsive
operation
Outdoor temperature sensor
Remote control for Comfortrol
programming unit
Underfloor heating circuit
Radiator heating circuit
Plate heat exchanger for system
separation
Heating circuit pump (field supplied)
Mixing valve temperature sensor
I
Accessory kit for heating circuit with
mixing valve
DHW storage tank
DHW tank temperature sensor
Expansion tank
The 3-way mixing valve, built-in to achieve
the low temperature level of the underfloor
heating circuit, is controlled by an accessory
kit for a heating circuit with mixing valve.
The circulation pump built into the Vitodens
200 boiler supplies the radiator heating
circuit and the plate heat exchanger for
system separation. The underfloor heating
circuit is supplied by a circulation pump
installed on site which is controlled by the
accessory kit.
Upon a call for DHW, the built-in diverting
solenoid valve is energized. The boiler hot
water is diverted to the DHW loop at
maximum pump rotational speed (no
variable speed pump operation during DHW
production). Once the DHW tank is
satisfied, the built-in diverting solenoid valve
is de-energized and heating operation
resumes.
IMPORTANT
The pressure drop (secondary circuit) of the
plate heat exchanger
must be less
than/equal to (≦) the pressure drop of the
3-way mixing valve.
This must be taken into account when
sizing the plate heat exchanger.
37
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