Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 49

Electrical connection
Plug Sensor
F21 Collector temperature sensor
F23 Solar circuit return temperature sensor
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
J4 Jumper for setting master/slave Modbus 2
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
(cont.)
Terminator enabled (delivered condition)
Terminator disabled
Heat pump control unit is slave
Heat pump control unit is master (delivered
condition)
Installation sequence
Type
NTC 20 kΩ
NTC 10 kΩ
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