Installation Sequence; Overview Of Electrical Connections - Viessmann VITOTRONIC300 Installation And Service Instructions Manual

Installation Sequence

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, LV
Outside temperature sensor
!
§/? Boiler temperature sensor
DHW tank temperature sensor
%A
DHW tank temperature sensor 2 for primary
%B
store system (optional accessory, not used)
Supply temperature sensor, low loss header
)
(accessory)
aG Flue gas temperature sensor (accessory)
Therm-Control temperature sensor
aJA
or
Return temperature sensor T1 (supplied with
VD2 and VD2A, accessory for CT3)
Return temperature sensor T2 (accessory)
aJB
or
Temperature sensor primary store system
(optional accessory, not used)
aVD External hook-up
aVG KM BUS participant (accessory)
External hook-up
aVH
34
Vitotronic 300, GW2B Installation and Service
Main PCB 120V~
sÖA1 Heating circuit pump
or
Primary pump, primary store system (not used)
or
Circulation pump, flue gas/water heat exchanger
(not used)
or
Switching output/shunt pump
sA DHW pump
DHW recirculation pump
sK
sL Shunt pump or boiler circuit pump
fÖ Power supply
Burner stage 1
fA
Central fault message
gÖ
gSA1 Motor for 3-way mixing valve, return temperature
control
or
Motor for 3-way mixing valve, primary store
system (not used)
Burner stage 2/mod.
lÖ
aBÖ External connections, e.g. supplementary safety
equipment
Safety chain, potential-free
aBA
Power supply connection for accessories
aBH