Viessmann VITOPLEX 200 Type SX2A Technical Manual page 26

Installation accessories
Boiler circuit pressure drop
(Boiler + pipework + flow distributor and return collector + heating cir-
cuit connection without mixer)
100
9
50
40
30
20
15
10
5
4
3
2
1
1 2
Flow rate in m³/h
A DN 65: Vitorond 200, 125 and 160 kW,
B DN 65: Vitorond 200, 195 kW,
C DN 65: Vitorond 200, 230 and 270 kW,
D DN 65: Vitoplex 200/300, 90 to 200 kW
E DN 80: Vitoplex 200/300, 235 to 300 kW
Example for calculating the residual head
Heating system with:
– Divicon heating circuit distributor DN 80
– Htg circ. 1: 1 heating circuit connection DN 25 without mixer,
– Htg circ. 2: 1 heating circuit connection DN 32 with mixer,
– Htg circ. 3: 1 heating circuit connection DN 50 with mixer,
Boiler circuit pressure drop
Boiler + pipework + flow distributor and return collector + heating circuit connection (without mixer) (see diagram) = 30 mbar
Mixer pressure drop
(see diagram)
Mixer
Pressure drop
Sum of the boiler circuit pressure drop and heating circuit connection pressure drop
Heating circuit 1: 30 mbar
Heating circuit 2: 30 mbar + 18 mbar = 48 mbar
VIESMANN
26
(cont.)
A B C D E
3 4 5 10 15
Mixer pressure drop
500
200
100
50
20
10
5
2
1
0.1 0.2 0.5
Flow rate in m³/h
A DN 25
B DN 32
C DN 40
20
D DN 50
Note
For the resistances of the pipework between the boiler and distributor,
6 x 90° bends and 5 m pipe lengths should be taken into consideration.
If essentially different lengths and shapes must be used on-site, the
relevant drops in pressure must be calculated and taken into
account.
Output 35 kW,
Output 60 kW,
Output 150 kW,
DN
mbar
A B C D
1 2 5 10 20
Flow rate 1.5 m 3 /h
Flow rate 2.5 m 3 /h
3
Flow rate 6.5 m /h
3
Total flow rate 10.5 m /h
32 50
18 22
OIL/GAS BOILERS