Viessmann D2RA, Installation Instructions For Contractors

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Connecting accessories to the mains at plug
lH
(230 V~) in the Vitotronic control unit
Where the boiler is sited in a wet room, accessories
outside the wet area must not be connected to the
power supply at the control unit. If the appliance is
sited outside any wet rooms, the mains connection for
the accessories can be made directly at the control
unit. This connection is switched directly with the
ON/OFF switch of the control unit. If the total system current exceeds 6 A, connect one or
more extensions directly to the mains supply via an
ON/OFF switch (see next chapter).
Power supply and KM BUS connection of accessories
Power supply to all accessories via heat source control unit
fÖ fÖ
B C
aVG fÖ lH
A D
E
aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 20
Some accessories with direct power supply
B C A D
E
fÖ fÖ aVG fÖ lH aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 21
A
Heat source control unit
B Extension kit for heating circuit with mixer M2
C Extension kit for heating circuit with mixer M3
D
AM1 extension, EA1 extension and/or solar con-
trol module, type SM1
E
ON/OFF switch
fÖ Mains input
fÖ A Power outlet
lH
Control unit power outlet
aVG
KM BUS connection
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the fuse rating
of the respective accessory: Only use the output con-
cerned to control an on-site relay.
Accessories Internal fuse protec-
tion
Extension kit for heating circuit
with mixer 2 A
AM1 extension 4 A
EA1 extension 2 A
Solar control module, type
SM1 2 A
Installation sequence
Electrical connections
(cont.)
5678 044 GB
Installation