Installation
18
Overview of electrical connections
Mixing valve extension circuit board
?
M2/M3 Supply temperature sensor
sÖ
M2/M3 Heating circuit pump
gS
M2/M3 Mixing valve motor
Low-voltage motherboard
!
Outdoor temperature sensor
(ATS)
§
Boiler temperature sensor (BTS)
%
DHW tank temperature sensor
(STS)
aG
Flue gas temperature sensor
(AGS) (accessory)
aJ
A
Therm-Control temperature
sensor
or
return temperature sensor T1
(RLS) (accessory)
aJ
B
Return temperature sensor T2
(RLS) (accessory)
aVD
Connection of external
equipment
aVG
KM BUS participant, e.g.
Vitotrol remote control
(accessory)
aVH
Connection of external
equipment
Line voltage motherboard
sÖ
A1 Heating circuit pump or
control output
sA
Circulation pump for heating
the DHW tank (accessory)
sK
DHW re-circulation pump
(provided by customer)
sL
Shunt pump
fÖ
Power supply connection
fA
Burner (1st stage)
gÖ
Central fault indicator
gS
A1 Continuous return
temperature control
or
3-way mixing valve for DHW
tank loading system
lÖ
Burner (2nd stage/modulating)
aBÖ
Connection of external
equipment, e.g. additional
safety equipment
aBA
Safety circuit, potential free
aBH
Power supply connection for
accessories
5285
941
-
0
1
145
145
1
17
17
15
143
146
150
28
21
52
20
29
50
40
156
156
A
B
52
52
20
20
2
2
M3
M2
M3
M2
M3
M2
A1
A1
5
90
41
151
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