Viessmann VITODENS 200-W B2HE 85 Installation Instructions Manual page 32

Boiler Connections
Electrical Connections
Legend
A Boiler
B CAN bus cable
C Other subscribers
Legend
A Boiler
B CAN bus cable
C Other subscribers
Accessories with direct power supply
Legend
A Boiler wiring panel
B Mixing valve extension kit
C Mixing valve extension kit
D EM-EA1 extension and/or EM-S1 extension
jF PlusBus
WARNING
Incorrect wiring can lead to serious injury from
electrical current and result in boiler damage.
Never route this cable next to line voltage (120VAC or

greater).
Strip as little of the insulation as possible, directly

before the terminals, and bundle close to the
corresponding terminals.
Secure cables with cable ties.

32
(continued)
Vitodens 200-W B2HE 85, 120, 150, 199 Installation
Checking the CAN bus terminator switch setting
The CAN bus resistor is switched using switch A in
the junction box.
Connecting a cascade via CAN bus
Connect two wires of the previous and following heat
generator to plug lA:
Loosen the screws in the terminals, insert the wires
and tighten the screws. Ensure correct polarity!
If the device is not integrated into a CAN bus system:

Switch A must not be set to "ON".
If the device is integrated into a CAN bus system and

is located at the beginning or end of this system (not
in the middle) of the CAN bus system: Set switch A
to "ON" (switched on).
If the device is integrated into a CAN bus system and

is not located at the beginning or end of the CAN bus
system: Do not set switch A to "ON" (switched off).
PlusBus connection of accessories
PlusBus system length max. 164 ft. (50 m) for 26 AWG
(0.34 mm 2 ) shielded cable.
If the current draw to the connected components
(e.g. circulation pumps) is higher than the fuse rating
of the relevant accessory, only use the output concerned
to control an on-site relay.
Accessories
EM-M1, mixing valve extension kit
EM-EA1 extension
EM-S1 extension
EM-P1 extension
Note on connecting PlusBus subscribers
As a maximum, the following PlusBus subscribers can
be connected to the control unit:
3 EM-M1 extensions

2 Vitotrol 200-E

3 EM-EA1 extensions

1 EM-S1 extension

1 EM-P1 extension

Internal fuse
protection
2A
2A
2A
2A