Technical data
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
aJA Temperature sensor T1
aJB 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 v.1.5
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