Viessmann vitodens Technical Manual page 79

System design 8
Vitodens 333 with one heating circuit with mixer and low loss header
B
A
WW
N
KW
O
A Vitodens 333 with
weather-compensated control unit
B Outside temperature sensor
C Vitotrol
D Underfloor heating circuit
E Max. temperature limiter
F Flow temperature sensor
G Heating circuit pump (on site)
System with regulated underfloor heating
circuit with three-way mixer.
Equipment required
Item Description
A Vitodens 333 with control unit for weather-compensated mode
C Vitotrol 200
or
Vitotrol 300
E Temperature limiter for limiting the max. temperature of underfloor heating systems
Immersion thermostat
or
contact thermostat
G Heating circuit pump
L Extension kit for one heating circuit with mixer plus flow temperature sensor
M Flow temperature sensor for low loss header
N Low loss header
VITODENS
D
C
E
F
G
H
M
K
M
L
~
H Regulating valve
K Three-way mixer
L Extension kit for one heating circuit
with mixer
M Flow temperature sensor low loss
header
N Low loss header
O DHW calorifier
Standard defaults
The volume flow (output) of the
underfloor heating system is greater than
the max. possible Vitodens volume flow
of 1 400 litres/h.
Therefore the low loss header needs to be
installed.
3.2 Installation examples
System design 8
KW Cold water
WW Hot water
The three-way mixer provided to achieve
the low temperature level of the
underfloor heating circuit is controlled by
the extension kit for one heating circuit
with mixer.
The circulation pump integrated into
Vitodens supplies the heating circuit up to
the low loss header.
The underfloor heating circuit is supplied
by an on-site circulation pump, which is
controlled by the extension kit.
Low loss headers are available in
conjunction with Modular Divicon or
individually as accessory.
See price list Vitotec or Vitoset.
For further details regarding low loss
headers, see page 92.
Number Part no.
1 as per price list
1 7450 017
1 7179 060
1 7151 728
1 7151 729
1 on-site
1 7178 995
1 7179 488
1 as per price list
333
3
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