Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 25

Electrical connections
Plug
sYS
Terminals Function
212.3 DHW circulation pump
212.4 Solar circuit pump with high limit safe-
ty cut-out (up to 95 °C) for DHW cylin-
ders
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. 20
Heating circuit without mixer A1/HC1
Without heating water buffer cylinder
■
With heating water buffer cylinder
■
(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
■
Connect high limit safety cut-out, part no. 7506 168, in
series to the solar circuit pump: See "High limit safety
cut-out" installation instructions.
Connecting the temperature limiter, part no. 7151 728,
7151 729
B
X2.N
X1.
?
A
B
M
C
1~
Fig. 21
to Circulation pump
A
Secondary pump
Heating circuit pump A1/HC1
Installation sequence
sÖ
C
25