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System Layout 3
Vitodens 200 (up to model WB2 8-32) with...
– DHW storage tank
– one heating circuit with mixing valve
– one heating circuit without mixing valve and low-loss header
PRV
AV
TPV
I
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 total flow rate of the two heating
circuits is greater than the maximum
possible water flow rate of the Vitodens
200 (see following table).
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 therefore
recommended.
The low-loss header is available as
accessory part.
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
Heating circuit pumps (field supplied)
Mixing valve temperature sensor
Accessory kit for a heating circuit
with mixing valve
I
Domestic hot water storage tank
DHW tank temperature sensor
Expansion tank
Low-loss header
Temperature sensor for low-loss
header
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 heating circuit up to
the low-loss header.
The radiator heating circuit is supplied by a
circulation pump installed on site.
IMPORTANT
An expansion board (optional) must be
ordered from Viessmann to control this
pump. See page 29 for details.
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.
35
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