External extensions (accessories)
Extension EA1
A1
PCB
F1
Fuse/MCB
DE1
Digital input 1
DE2
Digital input 2
DE3
Digital input 3
0 – 10 V 0 – 10 V input
fÖ
Power supply
Function description
(cont.)
fÖ A
Power supply for additional
accessories
aBJ
Central fault message/feed
pump/DHW circulation pump
(potential-free)
aVG
KM BUS
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