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Installation sequence
Power supply
Connecting heat generator accessories to a power
supply
■
Oil or gas boiler:
Plug
or
on the Vitotronic boiler control
lH
aBH
unit/HMU control unit:
Observe max. connected load of all accessories
(400 W). If required, connect the SDIO/SM1A elec-
tronics module directly to the mains supply: See
installation and service instructions for the boiler or
the Vitotronic control unit.
■
Heat pumps:
Terminal X3.1 on the cross connect PCB or at the
luster terminals:
Observe max. connected load of the heat pump con-
trol unit. If required, connect the SDIO/SM1A elec-
tronics module directly to the mains supply: See
installation and service instructions for the heat
pump.
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and dam-
age to the appliance.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■
IEC 60364-4-41
■
VDE regulations
■
TAR medium voltage VDE-AR-N-4110
■
Protect the power cable with a fuse/MCB of up
to 16 A.
Danger
The absence of component earthing can lead to
serious injury from electric current if an electrical
fault occurs.
The appliance and pipework must be connected
to the equipotential bonding of the building.
8
Isolators for non-earthed conductors
■
Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors. This should correspond to overvoltage
category III (3 mm) for full isolation. The isolator
must be fitted in the permanent electrical installation,
in line with installation requirements.
We additionally recommend installing an AC/DC-
■
sensitive RCD, type B
that can occur with energy efficient equipment.
Power supply for accessories and external compo-
nents
Recommendation: For accessories and external
■
components that are not connected to the control
unit, make the power connection to the same MCB/
fuse. At the very least, connect them in phase with
the control unit.
Connection to the same MCB/fuse provides addi-
■
tional safety in the event of the power being switched
off. Observe the power consumption of the connec-
ted consumers.
Danger
Incorrect core assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
!
Please note
Incorrect phase sequence can cause damage to
the appliance.
Ensure phase equality with the control unit
power supply.
, for DC (fault) currents
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