Waterside Flow (Primary Circuit); Typical System Flow Rates; Technical Data - Viessmann Vitodens 200 WB2 Series Technical Data Manual

Technical Data

Waterside Flow (primary circuit)

The Vitodens 200 is designed only for closed loop, forced circulation
hot water heating systems.
Pressure drop (primary circuit) of Vitodens 200
26 8
23 7
6
19.7
16.4 5
13.1
4
9.8 3
6.6 2
3.3 1
0
0
0 1.1 2.2
0 250 500
Flow rate

Typical System Flow Rates

Model WB2 6-24C*
∆
t for NG
Output (NG) 81 000
Btu/h
20 ºF rise (GPM) 8.1
25 ºF rise (GPM) 6.5
30 ºF rise (GPM) 5.4
35 ºF rise (GPM) 4.6
40 ºF rise (GPM) 4.1
∆
t for LP
Output (LG) 73 000
Btu/h
20 ºF rise (GPM) 7.3
25 ºF rise (GPM) 5.8
30 ºF rise (GPM) 4.9
35 ºF rise (GPM) 4.2
40 ºF rise (GPM) 3.7
Use standard friction loss method for pipe sizing.
Observe boiler maximum and minimum flow rate limitations. If system flow rate exceeds
boiler maximum flow rate (as stated on page 4) or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header. See page 34 for low-loss header information.
8
4.4 6.6 8.8
1000 1500 2000
6-24 8-32 11-44
81 000 112 000 154 000 206 000
8.1 11.2 15.3
6.5 9.0 12.2
5.4 7.5 10.2
4.6 6.4 8.7
4.1 5.6 7.6
73 000 101 000 139 000 192 000
7.3 10.1 13.8
5.8 8.1 11.0
4.9 6.7 9.2
4.2 5.8 7.9
3.7 5.1 6.9
GPM
11 13.2 15.4
2500 3000 3500 ltr/h
A low-loss header must be used when the system flow
15-60
rate exceeds the maximum (or minimum) flow rate of the
Vitodens 200 boiler. Once the low-loss header is
connected, the built-in low-loss header logic of the
20.5
Vitodens 200 boiler ensures the required
16.4
system through the sensory communication between the
low-loss header and the boiler.
13.7
11.7
*Please note that the low-loss header cannot be used
10.2
with the Vitodens 200, WB2 6-24C Combi boiler.
Please see page 35 for details.
19.1
15.3
12.7
10.9
9.6
Pressure drop up to model WB2 8-32
Pressure drop model WB2 11-44 and up
∆
t across the