Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 72

Installation sequence
Connecting the external electrical components
Version 1
"Hard" shut-off of power supply for compressor and/or instantaneous heating
water heater and OFF contact to control unit.
Power-OFF with 400 V power connection (version 1)
A No power-OFF in this position
B Control contact ripple control
receiver "power-OFF"
C Control of compressor or instanta-
neous heating water heater
D The air and creepage gap must
exceed 8 mm, since the control
input is a low voltage input
72
(cont.)
E Power-OFF contact for control
unit
F Terminals in the control panel
G Power circuit supply to compres-
sor or instantaneous heating
water heater