Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 35

Electrical connection
Plug
sYS
Terminals Function
212.3 DHW circulation pump
212.4 3-way diverter valve for heating water
buffer cylinder bypass or heat pump
in the case of dual alternative mode
Connecting a temperature limiter as a maximum temperature limiter for underfloor heating
Connecting a general temperature limiter
X2.N
X1.
?
A
B
M
C
1~
Fig. 27
Heating circuit without mixer A1/HC1
Without heating water buffer cylinder
■
With heating water buffer cylinder
■
Connecting the temperature limiter, part no. 7151 728,
7151 729 to mixer extension kit
B
A
sÖ
B
sÖ
M
C
1~
Fig. 29
Connect plug to mixer extension kit
A sÖ
Temperature limiter
B
Heating circuit pump for heating circuit with mixer
C
(cont.)
B
Connection
control unit
211.2
212.2
Explanation
Connection values
Output: 50 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connection values
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connecting the temperature limiter, part no. 7151 728,
7151 729
B
X2.N
X1.
?
A
B
M
C
1~
Fig. 28
to Circulation pump
A
Secondary pump
Heating circuit pump A1/HC1
Installation sequence
sÖ
C
35