Viessmann VITOTRONIC 200 Service Instructions Manual page 288

PCBs and connection options
Main and expansion PCB
Vitocal 300-A, type AWO-AC 301.B, Vitocal 300-A, type AWO 302.B
211.4 (main PCB)
Circulation pump for cylinder
heating
E
288
(cont.)
224.6 (expansion PCB)
Cylinder loading pump
■
2-way shut-off valve
D
■
Scheme
224.6
C
C
M
D
211.4
or
E
211.4
Secondary pump
A
E
A
A