8
Flow rate to be set on the DHW side (with temperature spread 10/60 °C) subject to heat exchanger output
40 60
80 100 120 140
0
10
20
30
40
50
60
70
80
Flow rate in l/min
HE output in kW
160 180 200 220 240
Fig.2
Setting the pumps
Vitotrans 222 (up to 80 kW and up to 120 kW) - circulation pump, DHW side
A
B
A
Variable differential pressure
B
Constant speed I, II, III
1
4
7
80 kW setting
1
4
7
Min.
120 kW setting
Vitotrans 222 up to 80 kW and up to 120 kW
0.5
1.0
1.5
2.0
2.5
3.0
10
20
30
40
50
60
70
80
90
100
100
200
300
400
500
600
700
800
900
1000
0
mbar
kPa 0
0
Flow rate in m³/h
Pressure drop/head
D
F
A
E
B
C
Fig.3
Commissioning, inspection, maintenance
Setting the heating output
(cont.)
5549 892 GB
