Gewiss Chorus GW 16 974CB, Installation Manual

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ATTENTION: the unused BUS signal cables, and the electrical continuity
conductor, must never touch any live elements or the earthing
conductor.
Figure B shows a diagram of the electrical connections.
1. Connect the red wire of the BUS cable to the red clamp (+) of the terminal, and the
black wire to the black clamp (-). Up to 4 BUS lines can be connected to the BUS
terminal (same coloured wires on the same terminal) (figure
E ).
2. Insulate the shield, the electrical continuity conductor, and the other white and yellow
wires of the BUS cable (if a 4 conductor BUS cable is being used), that are not
necessary (figure
D ).
3. Insert the BUS clamp in the pins of the device. The correct connection direction is
determined by the fixing rails. Insulate the BUS terminal with the special cover, that
must be fixed to the device. The cover guarantees the minimum separation distance
of 4 mm between the power cables and the BUS cables (figure
F ).
4. Connect the power supply and any inputs to the screw terminals located on the rear
of the thermostat (figure A ).
Electric connections
INSTALLATION INSTRUCTIONS
1. The length of the BUS line between the thermostat and the power supply must not
exceed 350 metres.
2. The length of the BUS line between the thermostat and the furthest KNX device to be
commanded must not exceed 700 metres.
3. To avoid unwanted signals and overvoltages, do not use ring circuits.
4. Keep a distance of at least 4 mm between the individually insulated cables of the BUS
line and those of the electricity line (figure C ).
5. Do not damage the electrical continuity conductor of the shielding (figure D ).
Recommendations for installing the KNX