Viessmann vitodens Technical Manual page 81

System design 10
Vitodens 333 with one heating circuit without mixer and one heating circuit with mixer plus system separation
B
A
WW
KW
O
A Vitodens 333 with
weather-compensated control unit
B Outside temperature sensor
C Vitotrol
D Underfloor heating circuit
E Radiator heating circuit
F Maximum temperature limiter
G Flow temperature sensor
System with various heating systems
H unregulated radiator heating circuit
H regulated underfloor heating circuit
with three-way mixer and system
separation for non-impermeable plastic
pipes (DIN 4726).
Required equipment
Item Description
A Vitodens 333 with control unit for weather-compensated mode
C Vitotrol 200
or
Vitotrol 300
F Temperature limiter for limiting the max. temperature of underfloor heating systems
Immersion thermostat
or
contact thermostat
H Heating circuit pump
M Extension kit for one heating circuit with mixer plus flow temperature sensor
N Plate heat exchanger Vitotrans 100
VITODENS
D
C
F
G
H
K
L
M
M
~
N
K
H Heating circuit pump (on site)
K Regulating valve
L Three-way mixer
M Extension kit for one heating circuit
with mixer
N Plate heat exchanger for system
*1
separation
O DHW calorifier
Standard defaults
The total volume flow of both heating
circuits is less than the max. possible
volume flow of Vitodens.
Balance the pressure differential (Dp)
between radiator heating circuit E and
plate heat exchanger N via regulating
valves K.
3.2 Installation examples
E
K
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 radiator heating
circuit and the plate heat exchanger for
system separation. The underfloor
heating circuit is supplied by an on-site
circulation pump, which is controlled by
the extension kit.
*1
Note
The secondary pressure drop of plate
heat exchanger N must be less/equal
(x) than/to the pressure drop of the
three-way mixer.
Please observe this when sizing the
plate heat exchanger (mixer has control
priority).
System design 10
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 as per price list
81
333
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