Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 73

Connecting the external electrical components
Power-OFF with 230 V power connection (version 1)
Instantaneous heating water heater
A No power-OFF in this position
B Control contact ripple control
receiver "power-OFF"
C Contactor (part no. 7814 681)
D The air and creepage gap must
exceed 8 mm, since the control
input is a low voltage input.
Compressor
A No power-OFF in this position
Installation sequence
(cont.)
E Power-OFF contact for control
unit
F Terminals in the control panel
G Instantaneous heating water
heater (230 V) power supply con-
nection
73