Viessmann vitodens Technical Manual page 72

3.2 Installation examples
System design 3
300
System design 3
Vitodens 200 or 300 with/without DHW heating with one heating circuit without mixer and one heating circuit with mixer
plus system separation
A
P
O
A Vitodens with weather-compensated
control unit
B Outside temperature sensor
C Vitotrol
3
D Underfloor heating circuit
E Radiator heating circuit
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 200 or 300 with weather-compensated control unit
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
L Extension kit for one heating circuit with mixer plus flow temperature sensor
M Plate heat exchanger Vitotrans 100
O Cylinder temperature sensor
P DHW cylinder
72
D
C
B
F
G
H
K
M
L
~
M
N
F Maximum temperature limiter
G Flow temperature sensor
H Heating circuit pump (on site)
K Three-way mixer
L Extension kit for one heating circuit
with mixer
Standard defaults
The total volume flow of both heating
circuits is less than the max. possible
volume flow of Vitodens.
The pressure differential (Dp) between
radiator heating circuit E and plate heat
exchanger M is balanced via regulating
valves N.
Boiler
Vitodens 200
Vitodens 300,
4.5 26.0 kW
Vitodens 300,
8.7 35.0 kW
E
N
M Plate heat exchanger for system
separation
N Regulating valve
O Cylinder temperature sensor
P DHW cylinder
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
Max. volume flow
circulation pump, which is controlled by
l/h
the extension kit.
1 400
*1
Note
1 400
The secondary pressure drop of plate
heat exchanger M must be less/equal
1 600
(x) than/to the pressure drop of the
three-way mixer.
Please observe this when sizing the
plate heat exchanger (mixer has control
priority).
*1
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
1 Standard
delivery
connection set
for DHW cylinder
1 as per price list
VITODENS