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KSM - Manual
2.4. Connecting R290 heat pump (KHX) to KSM
Connection between MODBUS ports on both module and heat pump are required for correct
communication between devices.
Connections should be to join:
with H2
RS485B- with H1
Connections should be made with cables with cross-section between 0.15 and 0.5 mm². Cables ends
should be terminated with terminals or covered with solder. To avoid mistakes cables should have
different colors than power cables.
Connection schematic is shown below
Configuration
switches
set
to
„ON”
2.5. Connector discription
KSM module inputs and outputs are shown below
N, L - main power 230V input
H1, H2 - MODBUS protocol
connectors (corresponding to
RS485B- and )
A, B - C14 protocol connectors
G, U - +12V output
LAN - internet connection (RJ45)
