Technical data

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)
aJA Therm-Control temperature
sensor
or
return temperature sensor T1
(RLS) (accessory)
aJB 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
gSA1 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 v.1.5
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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