Heating system types
10
Heating system types for modulating boilers
(continued)
System type 2 – Single-boiler system with shunt pump and return valve 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
M2 Heating circuit pump, mixing
valve circuit 2
sÖ
M3 Heating circuit pump, mixing
valve circuit 3
sA
Circulation pump for heating
the DHW tank
sK
DHW re-circulation pump
sL
Shunt pump
fÖ
Power supply connection,
120 VAC
fA
Burner (1st stage)
gS
A1 Mixing valve motor for raising
the return temperature
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
M2
M3
29
52
2 20 52
2 20 52
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
A1
