Viessmann Vitocal 242-S Installation And Service Instructions Manual page 52

Installation sequence
Electrical connection
Plug sYS
Terminals Function
212.3 DHW circulation pump
212.4 Solar circuit pump with high
limit safety cut-out (max. 95
°C) for DHW cylinders
Connecting a temperature limiter as a maximum temperature limiter for under-
floor heating
Connecting a general temperature
limiter B
X2.N
X1.
?
A
B
52
(cont.)
M
C
1~
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 the high limit safety cut-out to
the solar circuit pump in series (see high
limit safety cut-out installation instruc-
tions).
Connecting the temperature limiter,
part no. 7151 728, 7151 729 B
X2.N
X1.
?
A
B
sÖ
M
C
1~