Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 184

Connection and wiring diagram
Position of PCBs
Danger
Touching live components can result in serious
injuries.
Isolate the system from the power supply (e.g.
by removing the separate fuse or by means of a
mains isolator) and check that it is no longer
live.
Safeguard the system against reconnection.
A
B
C
D
Fig. 116
PCB ZPK 2.02
A
PCB HKK 2.01
B
PCB KSK 2.03
C
PCB BLS 1.01
D
ZPK Auxiliary PCB: Control of the fuel charging and
cleaning systems
HKK Heating circuit PCB: Control of the heating cir-
cuits, DHW heating and a solar circuit
184
1.
2.
KSK Main PCB: Burner control unit, power export,
BLS PCB transducer Lambda probe
KM-BUS, CAN bus, buffer temperature sensors,
control of automatic return temperature raising
facility