Installation Sequence; Overview Of Electrical Connections - Viessmann VITOTRONIC 100 GC1B Installation And Service Instructions Manual

Installation Sequence

Overview of Electrical Connections

Note: When making connection to plugs aVD and aVH,
bundle the individual wires of the cables closely to
the terminals.
Legend
Main PCB, low voltage
Boiler water temperature sensor
§
%A DHW tank temperature sensor
%B DHW tank temperature sensor 2 for primary store
system (optional accessory, not used)
) Supply temperature sensor, low loss header
(accessory)
Flue gas temperature sensor (accessories)
aG
aJA Therm-Control temperature sensor
or
Return temperature sensor T1 (supplied with VD2
and VD2A, accessory for CT3)
aJB Return temperature sensor T2 (accessory)
or
Temperature sensor primary store system
(optional accessory, not used)
aVD External connection
aVG KM BUS participant (accessory)
aVH External connection
48
Vitotronic 100, GC1B Installation and Service
This prevents the wires from drifting into the adjacent
voltage area.
Main PCB 120V~
sÖA1 Switching output
or
Primary pump for primary store system
(optional accessory, not used)
DHW pump
sA
Shunt pump or boiler circuit pump (on site)
sL
fÖ Power supply
Burner stage 1
fA
Central fault message
gÖ
gSA1 Motorized isolation valve
or
Mixing valve, return temperature raising facility
or
3-way mixing valve, primary store system
(optional accessory not used)
lÖ Burner stage 2/mod.
External connections, e.g. supplementary safety
aBÖ
equipment
aBA Safety chain, potential free
Power supply for accessories
aBH