Heating system types
6
Heating system types for modulating boilers
System type 1 – Single-boiler system with shunt pump for raising the return temperature
in conjunction with
Vitorond 200, VD2
A
Boiler with Vitotronic 300
B
Domestic hot water tank
C
Heating circuit with mixing valve
plugs
!
Outdoor temperature sensor
?
M2 Supply temperature sensor,
mixing valve circuit 2
?
M3 Supply temperature sensor,
mixing valve circuit 3
§
Boiler temperature sensor
%
DHW tank temperature sensor
aJ
A
Temperature sensor T1
aJ
B
Temperature sensor T2
sÖ
A1 Close mixing valves with
external heating circuit controls
sÖ
M2 Heating circuit pump, mixing
valve circuit 2
sÖ
M3 Heating circuit pump, mixing
valve circuit 3
sA
DHW pump
sK
DHW re-circulation pump
sL
Shunt pump
fÖ
Power supply connection,
120 VAC
fA
Burner (1st stage)
gS
M2 Mixing valve motor, mixing
valve circuit 2
gS
M3 Mixing valve motor, mixing
valve circuit 3
lÖ
Burner (2nd stage/modulating)
aVD
Connection of external
equipment (see page 38)
aVH
Connection of external
equipment (see page 39)
*1
On the Vitorond the boiler supply and return are at the rear of the boiler.
5285
941
-
0
1
A1 M2
M3
5
21
28
1
B
C
C
2
20
52
M3
A
90
41
40
146
143
3
17A
17B
T1
T2
*1
2
20
52
M2
29
20
2 20 52
2 20 52
