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

Installation, Vitotronic 300-K

Overview of Electrical Connections

Extension for heating circuits 2 and 3 with mixing valve
? M2/M3 Supply temperature sensor
sÖ M2/M3 Heating circuit pump
gS M2/M3 Mixing valve motor
Main PCB low voltage
Outside temperature sensor
!
§/? Supply temperature sensor, common heating flow
%A DHW tank temperature sensor
DHW tank temperature sensor 2 for primary store
%B
system (optional accessory, not used)
Return temperature sensor T2 (optional accessory,
aJB
not used)
or
Temperature sensor primary store system
(optional accessory, not used)
aVD External hook-up
KM BUS participant (optional accessory, not used)
aVG
External hook-up
aVH
LON LON BUS, connecting cable for data exchange with
the Vitotronic 300, GW5B, 200-H, Vitocom and
Vitogate
26
Vitotronic 300, GW5B & MW1B Installation and Service
Note: When connecting plugs aVD, aVH, sA, sK, ?
M2/M3 and sÖ M2/M3, bundle the individual
wires of the cables close to the terminals.
This ensures that, should there be an error, for
example when detaching a wire, the wires cannot
drift into the adjacent voltage area.
Main PCB 120V~
sÖA1 Heating circuit pump
or
Primary pump, primary store system
Circulation pump for DHW tank heating
sA
(optional accessory, not used)
sK DHW circulation pump (on site)
sL Shunt pump or distribution pump (on site)
Power supply
fÖ
gÖ Central fault message
gSA1 Motor for 3-way mixing valve, primary store system
or
Motor for 3-way mixing valve, return temperature
control
Power supply connection for mixing valve module
aBH
circuit M2 and M3
Note: When inserting cables and applying strain relief
see page 29.