Internal Extensions Ea1 - Viessmann VITODENS 222-F Service Instructions Manual

Troubleshooting

Internal Extensions EA1

Legend
A1 PCB
F1 Fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 – 10V 0 - 10V input
fÖ Power supply
A Power supply for additional
40A
accessories
aBJ Central fault message/
feed pump/DHW recirculation
pump (potential-free)
KM BUS
aVG
86
Vitodens 222-F B2TB 19 and 35 Service
Refer to main wiring diagram on page 90.