Power Supply Fö - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Electrical connections
Power supply to all accessories via heat source control unit
A
E
Fig. 15
Some accessories with direct power supply
A
E
Fig. 16
Heat source control unit
A
Extension kit for heating circuit with mixer M2
B
(control unit for weather-compensated operation
only)
Extension kit for heating circuit with mixer M3
C
(control unit for weather-compensated operation
only)
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the fuse rating
of the relevant accessory, only use the output con-
cerned to control an on-site relay.
Power supply
fÖ
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and in
appliance damage.
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
■ Connection requirements specified by your
local power supply utility
(cont.)
B C
B C
D
D
AM1 extension or EA1 extension
D
On-site ON/OFF switch
E
Mains input
fÖ
A Power outlet
fÖ
Power outlet at the control unit
lH
aVG KM BUS connection
Accessories
Extension kit for heating circuit
with mixer
AM1 extension
EA1 extension
Install an isolator in the power cable to provide
■
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage cate-
gory III (3 mm) for full isolation. This isolator must be
fitted in the permanent electrical installation, in line
with the installation requirements.
In addition, we recommend installing an AC/DC-sen-
sitive RCD (RCD class B
rents that can occur with energy efficient equipment.
■ Max. fuse rating 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.
Installing the boiler
Internal fuse protec-
tion
2 A
4 A
2 A
) for DC (fault) cur-
23