49
Plug
Sensor
Type
F21
Collector temperature sensor
NTC 20 kΩ
F23
Solar circuit return temperature sensor
NTC 10 kΩ
aVG
KM BUS (wires interchangeable)
Use the KM BUS distributor (accessories) if sev-
eral devices are connected.
KM BUS subscriber (examples):
■ Extension kit, mixer for heating circuit M2/HC2
■ Remote control Vitotrol 200A or Vitotrol 300B
(select the heating circuit assignment at the re-
mote control)
■ EA1 extension, AM1 extension
■ Communication interface Vitocom 100, type
GSM2
—
sVA
Modbus 2 (wires
not
interchangeable)
Connection for electricity meter of photovoltaic
system
—
J3
Jumper for terminator Modbus 2
Terminator enabled (delivered condition)
Terminator disabled
—
J4
Jumper for setting master/slave Modbus 2
Heat pump control unit is slave
Heat pump control unit is master (delivered
condition)
—
X18
Modbus 1
Connection for Viessmann appliances, e.g.
Vitovent 300-F
Note
If further Viessmann appliances are to be con-
nected to Modbus 1, plug in the Modbus distrib-
utor (accessory) (see "Modbus distributor" instal-
lation instructions).
—
X24
Connection for LON communication module (see
"LON communication module" installation in-
structions)
—
X31
Slot for coding card
—
Installation sequence
Electrical connection
(cont.)
5546 699 GB
Installation
