Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 81

Power supply
(cont.)
Compressor power supply
A Terminals at the control module
Instantaneous heating water heater power supply
A Terminals in the control panel
Max. fuse rating 16 A
Recommended power cable:
2
6 kW: 7 x 1.5 mm
2
9 kW: 7 x 2.5 mm
Max. lead length: 30 m
Power supply 230 V~, one tariff
One common power cable with a large cross-section up to the vicinity of the
heat pump.
The common power cable cannot be blocked. Selective blocking of the indivi-
dual power cable must take place downstream of the sub-distribution, result-
ing in additional sub-distribution cost.
Installation sequence
Recommended power cable: 3 x 4
2
mm
Note
The upstream fuses must have Z
characteristics.
Each heater winding requires its own
neutral conductor. Never bridge the
neutral conductor without increasing
the cross-section.
Blue flexible tubing has been provided
with the unit for marking the neutral
conductors in accordance with
VDE 0100, part 430.
Danger
Incomplete phase shutdowns
can lead to the transfer of dan-
gerous body currents, should
an electrical fault occur.
The circuit breakers must be
mechanically blocked
together. The use of individual
circuit breakers is not accepta-
ble.
81