Viessmann Vitotronic 100 Installation And Service Instructions Manual page 70

Connection and wiring diagram
Connection and wiring diagram
A B
Fig. 44
Type KC2B: Pushbutton
A
Type KC4B: Terminals
B
A1 Main PCB
A2 Power supply unit PCB
A3 PCB
A5 Programming unit
A6 Coding card
A11 Optolink PCB
X Electrical interfaces
F1 Fuse
F6 High limit safety cut-out 110 °C (100 °C)
F7 Temperature controller 75 °C (87 °C, 95 °C)
K1-K4 Relay
S1 ON/OFF switch
S2 Test key (only for type KC2B)
U1-U3 Optocoupler
V1 Fault indicator (red)
V2 ON indicator (green)
230 V~ plug
Heating circuit pump A1 (accessories)
sÖ
sA Circulation pump for cylinder heating (accesso-
ries)
70
sK No function
Power supply, 230 V/50 Hz
fÖ
Oil/gas burner (connection according to DIN
fA
4791)
Power supply for accessories
lH ■
■ Vitotrol 100
or
■ External demand/external blocking
X12 External burner start
(stage 1)
LV plugs
No function
!
Boiler water temperature sensor
§
Cylinder temperature sensor
%
Buffer temperature sensor
)
Flue gas temperature sensor (accessories)
aG
KM-BUS subscriber (accessories)
aVG
2-stage/modulating burner extension
a:A
(part of the standard boiler delivery)