Operating instructions

System extension

DHW heating with a cylinder storage system (cont.)

Required coding

4C : 1 Primary pump connection on plug sÖA1

4E : 1 Motor connection for three−way mixing valve on plug gSA1

55 : 3 Cylinder thermostat  cylinder storage system

Automatic changeover

4b : 1 Connection of temperature sensor Vitotrans 222 on plug aJB

In conjunction with system version 2.

The sensor input aJB is used to

control Vitotrans 222. Therefore, the

shunt pump must be controlled by a

separate thermostat.

Required coding: "4d:2"

A Junction box, on site

B Shunt pump

C Control thermostat,

part no. Z001 886

In conjunction with system version 3.

A separate Vitotronic 050 must be

used for controlling the Vitotrans

222. The boiler control unit regulates

the constant raising of the return

temperature (see also coding

address "4E").

5862730GB