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Project planning information
6 Project planning information
6 .1 Cable selection
Use mains cable suitable for the type of operation and
complying with local regulations.
Signal and control line: max. 2.5 mm
Cable for burner ground/PE wire: 4 mm
Burner ground connector may also be located outdoors.
Do not route BCU cables in the same cable duct as
frequency converter cables or cables emitting strong
fields.
6 .1 .1 Ionization cable
Use unscreened high-voltage cable, see page 27
(Accessories).
Recommended cable length: max. 50 m.
Lay cable individually and, if possible, not in a metal
conduit.
Install well away from mains cables and interference
from electro-magnetic sources.
Do not lay together with ignition cable.
6 .1 .2 Ignition cable
Use unscreened high-voltage cable, see page 27
(Accessories).
Cable length for internal ignition: max. 5 m (16.4 ft).
External electrical interference must be avoided. The
longer the ignition cable, the lower the ignition capacity.
BCU 440 · Edition 01.17
2
.
2
.
Lay cable individually and, if possible, not in a metal
conduit.
Do not lay UV/ionization cable and ignition cable to-
gether and lay them as far apart as possible.
Screw the ignition cable securely into the ignition trans-
former and feed it out of the unit on the shortest pos-
sible route (no loops) – use the left-hand M20 plastic
cable gland.
Only use radio interference suppressed terminal boots
(with 1 kΩ resistor) for spark electrodes, see page 27
(Accessories).
6 .2 Spark electrode
6 .2 .1 Electrode gap
Gap between electrode and burner ground:
2 mm ± 0.5 mm.
6 .2 .2 Star electrodes
We recommend using 7.5 kV ignition transformers on
burners with star electrodes.
19
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