Viessmann Vitotronic 100 Installation And Service Instructions Manual page 18

Electrical connections
Connecting the pumps
230 V~ pumps
Rated current: 4(2) A~
M
A
1~
B
Fig. 12
Pump
A
To the control unit
B
230 V~ pumps with power consumption greater than 2 A or high efficiency circulation pumps
Pumps with switching input
N L
C
L N
B
Fig. 13
Pump
A
To the control unit
B
C Contactor
Separate power supply (observe manufacturer's
D
instructions)
18
(cont.)
D
L N
L
N PE
External
ON/OFF
A
Pumps without switching input
N L
C
L N
B
Fig. 14
Pump
A
To the control unit
B
Contactor
C
Separate power supply (observe manufacturer's
D
instructions)
D
L N
L N PE
A