Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 88

Installation sequence
Electrical connections
Connecting the temperature limiter for limiting the maximum temperature of
underfloor heating systems
Connection with temperature limiter,
general
X2.N
X1.
?
A
B
A For connection to
main PCB with extension, see table
below
B Temperature limiter
C Heating circuit pump A1, M2
Temperature limiter for heating circuit
Heating circuit A1 without heating water buffer cylinder 211.2
Heating circuit A1 with heating water buffer cylinder
Heating circuit M2
88
(cont.)
M
C
1~
Connection with temperature limiter
(part no. 7151 728, 7151 729)
X2.N
X1.
?
A
B
C
A For connection to main PCB with
extension, see table below
B Temperature limiter
C Heating circuit pump A1, M2
Connection to main PCB
with extension
212.2
225.1
sÖ
M
1~