127
sÖ
Heating circuit pump
or
Primary pump, primary store
system
sA
Circulation pump for cylinder
heating (accessory)
sK
DHW circulation pump (acces-
sory)
sL
Distribution pump
fÖ
Power supply 230 V/50 Hz
gÖ
Central fault message output
(on site)
gS
Motor for 3-way mixing valve,
primary store system
aBH
Power supply for accessories
F MCB/Fuse
K2-K10 Relay
S1 ON/OFF switch
X... Electrical interfaces
PCB, low voltage
!
Outside temperature sensor/
radio clock receiver (accesso-
ries)
§/?
Common flow temperature sen-
sor
%A
Cylinder temperature sensor
%B
Cylinder temperature sensor 2
(accessory)
)
No function
aG
No function
aJA
No function
aJB
Temperature sensor primary
store system
Schemes, Vitotronic 300-K
Connection and wiring diagrams
(cont.)
5601 090 GB
Service
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