Power Supply - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Power supply

Isolators for non-earthed conductors
■ The mains isolator (if installed) must
simultaneously isolate all non-earthed
conductors from the power supply with
a minimum contact separation of 3 mm
■ We additionally recommend installing
an AC/DC-sensitive RCD (RCD class
B ) for DC (fault) currents that
can occur with energy efficient equip-
ment
■ If no mains isolator is installed, all non-
earthed conductors must be isolated
from the power supply by the upstream
circuit breakers with at least 3 mm con-
tact separation
Danger
Incorrectly executed electrical
installations can lead to injury
from electrical current and result
in equipment damage.
Make the power supply connec-
tion and implement all protective
measures (e.g. RCD circuit) in
accordance with the following
regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Technical connection require-
ments specified by your local
power supply utility
■ Protect the power supply to the
heat pump control unit with
max. 16 A
Installation sequence
Danger
An absence of component earth-
ing in the system can lead to seri-
ous injury from electrical current
if an electrical fault occurs.
Connect the appliance and pipe-
work to the equipotential bonding
of the house in question.
Danger
Incorrect core allocation can
cause severe injury and damage
the appliance.
Never interchange cores "L" and
"N".
■ In negotiations with your power supply
utility, different supply tariffs for the
main power circuits may be offered.
Observe the technical connection
requirements of the power supply util-
ity
■ If the compressor and/or instantane-
ous heating water heater are operated
at an economy tariff (power-OFF),
either provide an additional cable (e.g.
3 x 1.5 mm 2 ) for the power-OFF signal
from the distribution board (meter box)
to the heat pump control unit
or
Combine the cable for the power-OFF
signal and for the heat pump control
unit power supply (3 x 1.5 mm
core cable
■ The allocation of the power-OFF (for
compressor and/or instantaneous
heating water heater) is made via the
type of connection and by setting
parameters in the heat pump control
unit.
In Germany, the power supply can be
cut off for up to 3 x 2 hours per day
(24 h)
2
) in a 5-
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