Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 97

Power supply
(cont.)
Control unit power supply
A Mains terminals inside the control
unit
Power supply, compressor (main power circuit) and fan
B Mains terminals in the control
panel
Note
The upstream fuses must have Z
characteristics.
Sealing the low tariff connection
The power supply utility can demand
that the low tariff connection is
sealed.
Installation sequence
Note
This supply must never be blocked.
& Max. fuse rating 16 A
& Standard tariff (no optional low tariff
with power-OFF)
& Recommended cable: 3 x 1.5 mm
& Low tariff and power-OFF can be
used.
& Fuse protection in accordance with
the compressor rating (see specifi-
cation).
& No parameters need to be set when
using low tariff with power-OFF.
During the power-OFF period, the
compressor is shut down.
& Recommended cable: 3 x 4 mm
If the cable length exceeds 20 m, a
larger cable cross-section is
required
1. Remove contact shield (see
page 65).
2. Connect power cable 230 V~.
1. Install the contact shield (see
page 65) in front of the mains term-
inals in the control panel.
2. Guide the seal wire through holes
in both studs.
2
2
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