Viessmann VITODENS 200-W Technical Manual page 16

Installation accessories
Determining the required internal diameter
5.0
2.5
2.0
1.5
1.0
2
0.5
0.2
0.1
Mixer control characteristics
A Divicon with three-way mixer
The identified operating ranges B to D provide optimum control
characteristics with the Divicon mixer:
B Divicon with three-way mixer (R ¾)
Application range: 0 to 1.0 m
Example:
Heating circuit for radiators with an output of ² = 11.6 kW
Heating system temperature 75/60 °C (ΔT = 15 K)
c Specific heat capacity
µ Mass flow rate
² Output
´ Flow rate
Bypass valve
Part no. 7464 889
To hydraulically balance the heating circuit with mixer. Inserted into
the Divicon.
VIESMANN
16
(cont.)
A
B
C
D
3
/h
1 3 5 10 20 30 40
Heating circuit output
in kW
C Divicon with three-way mixer (R 1)
3
Application range: 0 to 1.5 m
D Divicon with three-way mixer (R 1¼)
3
Application range: 0 to 2.5 m
Wh
² = µ · c · ΔT c = 1.163
kg · K
11600 W · kg · K
²
´ = =
c · ΔT 1.163 Wh · (75-60) K
Select the smallest possible mixer within the application range with
value ´.
Result of this example: Divicon with three-way mixer (R ¾)
Overflow valve
Part no. 7429 738: R ¾
Part no. 7429 739: R 1
Part no. 7429 740: R 1¼
Only with manually controlled heating circuit pump. Fitted onto the
Divicon.
5.0
2.5
2.0
1.5
1.0
0.5
0.2
0.1
/h
/h
´ (1 kg ≈ 1 dm³)
µ
kg m³
= 665 0.665
h h
VITODENS 200-W