Siemens Desigo RXB Technical Manual

8 / 22Siemens Installation guide RXB, RXL CM110381en_01Building Technologies Periphery wiring (without bus) 28 Feb 2009– The subline length is limited to 3 meters for line topologies(See section 4.5.2)– You cannot switch multiple lines in parallel to increase wiring diameter!A ∅ max. simple line length[mm 2 ] [mm] [m]1,00 1,15 1250,75 0,98 1150,50 0,80 75Address room devices is not supported in the room automation system DESIGORXB / RXL (in contrast to DESIGO PX).Address 1 must, however, be set in the room units (factory setting).3.1.6 Relay outputsFans are controlled using potential-free relay outputs. The following applied for thewiring:– The maximum load of the relay contracts must be observed (see data sheets forthe corresponding controller)– The sizing and fusing of the power lines are oriented to overall connected loadand local regulations.– Fusing of switching circuits depends on the controller. The fused electricalvalues must therefore be reviewed in the data sheets for the correspondingcontrollers.– The lines must be fused on the controller with strain relief.Controllers RXB22.1 and RXL22.1 also have a relay contract (Q44) for switchingelectrical heating coils. Observe the following:• The maximum power is 1.8 kW ohm load. Larger loads close the contact toomuch.• A external fuse of max. 10 A is planned to protect room controller circuits.