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Installation Examples
System Layout 4
Vitodens 200 (up to model WB2 8-32) with...
– DHW storage tank
– two heating circuits with a mixing valve
PRV
TPV
Y
Installation of different heating circuits...
H radiator heating circuit
H underfloor heating circuit with 3-way
mixing valve (low temperature circuit)
H DHW production
...with the following flow conditions
1. The total flow rate of the two heating
circuits is greater than the maximum
possible flow rate of the Vitodens 200 (see
following table).
36
AV
M
~
O
Model No.
Vitodens 200,
WB2 6-24C
WB2 6-24
WB2 8-32
The use of a low-loss header is therefore
recommended.
The low-loss header is available as
accessory part.
See page 29 in this manual for details on
the low-loss header.
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief
valve
P
Vitodens 200 gas-fired condensing
boiler with Comfortrol programming
unit for weather-responsive
operation with 2-wire BUS expansion
module
Outdoor temperature sensor
Remote control for Comfortrol
programming unit
Underfloor heating circuit
Radiator heating circuit
Heating circuit pump (field supplied)
Mixing valve temperature sensor
Accessory kit for a heating circuit
M
~
with mixing valve
I
I
Vitotronic 050/Dekamatik-HK1 control
with communication module
DHW storage tank
DHW tank temperature sensor
Expansion tank
Low-loss header
O
Temperature sensor for low-loss
header
P
Vitotrol 200 remote control
The 3-way mixing valve, built-in to achieve
Max. flow rate
the low temperature level of the underfloor
(GPM/ltr/h)
heating circuit, is controlled by an accessory
kit for a heating circuit with mixing valve.
6.2/1400
The circulation pump built into the Vitodens
6.2/1400
200 boiler supplies the heating circuit up to
the low-loss header.
7.0/1600
The underfloor and radiator heating circuits
are supplied by circulation pumps installed
on site which are controlled by the
accessory kit or the Vitotronic 050/
Dekamatik-HK1 control.
If more than two heating circuits with
mixing valves are to be connected, they can
be controlled by the Vitocontrol.
Contact your local Viessmann Technical
Sales Representative for details.
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.
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