Viessmann Vitotronic 200 Installation And Service Instructions Manual page 13

System extension
In conjunction with system version 2
E Junction box (on-site)
F Shunt pump
G Control thermostat, part
no. Z001 886
In conjunction with system version 3
A separate Vitotronic 200-H must be
used for regulating the Vitotrans 222.
(cont.)
The sensor input aJB is used to con-
trol the Vitotrans 222. Therefore, the
shunt pump must be controlled by a
separate thermostat.
Required coding: "4d:2".
The boiler control unit affects the con-
stant return temperature control
(see coding address "4E").
Preparing for installation
13