Viessmann Vitocal 200-G Series Installation And Service Instructions Manual page 37

Electrical connection
Plug Sensor/component
KM-BUS (wires interchangeable)
aVG
Use the KM-BUS distributor (accessories) if several devices are connected.
KM-BUS subscribers (examples):
Mixer extension kit for heating circuit M3/HC3
■
Remote control (set heating circuit allocation on the remote control)
■
EA1 extension, AM1 extension
■
Modbus (do not interchange the wires), e.g. connection for energy meter of
sVA
photovoltaic system
J1 Jumper for Modbus terminator
Terminator active (delivered condition)
Terminator not active
X18 Modbus (do not interchange the wires), e.g. Vitovent 300-F
Note
If several appliances are to be connected, use the Modbus distributor (acces-
sories): See "Modbus distributor" installation instructions.
X24 Connection for LON communication module: See "LON communication mod-
ule" installation instructions
X31 Coding card slot
Connection, PWM signal, solar circuit pump
a:DD
Note
Flow temperature sensor for heating circuit with
mixer M3/HC3: The flow temperature sensor for one
heating circuit with mixer M3/HC3 is connected to the
mixer extension kit (accessories).
Connecting a temperature limiter to restrict the maximum temperature of underfloor heating cir-
cuit
System without heating water buffer cylinder: Connection to X3.2/X3.14
If the temperature limiter installed to restrict the maxi-
mum temperature of underfloor heating circuit
responds, the heat pump is switched off. The under-
floor heating circuit is no longer supplied.
X3.2
X1.
?
X3.14
A
Fig. 25
Temperature limiter to restrict the maximum tem-
A
perature of underfloor heating systems
(cont.)
!
Please note
If the temperature limiter installed to restrict the
maximum temperature of underfloor heating cir-
cuit is designed as an N/C contact, the heat
pump will not start up.
Design the temperature limiter to restrict the
maximum temperature of underfloor heating cir-
cuit as N/O contact.
Installation sequence
Type
—
—
—
—
—
—
—
37