Controller And Sensor Pcb - Viessmann Vitocal 300-G Dismantling Instructions

Heat pump control unit electrical connections
Terminals Function
X3.12 "External demand" signal: External
X3.13 compressor start
X3.17 MCB/fuse F1 6.3 A (slow)
X3.18
X3.18 Heat pump control unit power supply:
Phase L1
X1.1 Earth conductor terminal
X2.1 Neutral conductor terminal
X5/X7 Connecting cable to the heat pump:
230 V~ control cable

Controller and sensor PCB

Plug Sensor/component
KM-BUS (wires interchangeable)
aVG
Use the KM-BUS distributor (accessories) if several devices are connected.
Modbus 2 (wires not interchangeable):
sVA
Data connection to higher ranking control unit
J3 Jumper for terminator Modbus 2
Terminator enabled (delivered condition)
Terminator disabled
J4 Jumper for setting master/slave Modbus 2
Heat pump controller is slave.
Heat pump controller is master (delivered condition).
X15 Connecting cable to the heat pump: KM-BUS
X24 LON communication module (accessories): See "LON communication module" installation in-
structions.
X25 Connecting cable to the heat pump: LV < 42 V
X31 Coding card slot
(cont.)
Explanation
Requires floating contact:
Closed: Demand
■
Open: No demand
■
Breaking capacity 230 V, 2 mA
■
Note
These and further external functions, e.g. provision of
external set values, can alternatively be connected via
external EA1 extension.
See "EA1 extension" installation instructions
—
Power supply 230 V~
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