Theben RAMSES 850 top2 OT Instructions De Montage Et D'utilisation page 42

Connection
• The power supply from the thermostat to the boiler is provided via OpenTherm.
• The two-wire connection (OpenTherm) is not polarised, i. e. the wires can be connected to
the boiler as required.
OT device connection
0–10 V device connection
6
Heater
OT
6
5
Heater
GND
6
0–10 V
5
+24 V
4
CAUTION!
 Do not feed the thermostat cable through
the same cable duct as the 230 V mains
cable.
 Do not lay thermostat cable parallel to
power cable.
 Disconnect the boiler from mains supply
before connecting the thermostat.
 Faulty connections can damage the device.
 24 V power supply must be SELV.
 The bus cable can be extended to 50 m
without interference.