142
Danger
Touching live components can result in life
threatening injuries. After switching off the
ON/OFF switch on the control unit, there are still
live components inside the control unit enclo-
sure.
■
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
1.
2.
Fig. 86
A
PCBs in the control unit wiring chamber
■
ZPK
2.03
Auxiliary PCB: Control of the fuel charging and
cleaning systems
■
HKK
2.01
Heating circuit PCB: Control of the heating cir-
cuits, DHW heating and solar
■
KSK
2.03
Main PCB: Burner control unit, KM-BUS,
CAN bus, buffer temperature sensors, control of
automatic return temperature raising facility
1.
Remove the casing panel.
2.
Unscrew the cover of the control unit enclosure.
Connection and wiring diagram
Position of the PCBs
5679249
Appendix
