Overview Of Electrical Connections - Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual

Installation

Overview of electrical connections

52 M3
M2
52
20 M3
M2
20
M3
2
M2
2
145
145
1
17
B
17 A
5
3/2
15
143
146
Mixing valve extension circuit board
? M2/M3 Supply temperature sensor
sÖ M2/M3 Heating circuit pump
gS M2/M3 Mixing valve motor
18
28
21
A1
52
A1
20
29
50
40
156
156
Low-voltage motherboard
! Outdoor temperature sensor
(ATS)
§ Boiler temperature sensor (BTS)
% DHW tank temperature sensor
(STS)
Flue gas temperature sensor
aG
(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
150
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)
Shunt pump
sL
Power supply connection
fÖ
Burner (1st stage)
fA
gÖ Central fault indicator
gSA1 Continuous return
temperature control
or
3-way mixing valve for DHW
tank loading system
Burner (2nd stage/modulating)
lÖ
Connection of external
aBÖ
equipment, e.g. additional
safety equipment
aBA Safety circuit, potential free
aBH Power supply connection for
accessories
151
90
41