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4 Design and Functions
4.2 Connecting Diagrams
4.2.1 Terminal assignment BT300 - Connection example
WARNING!
Conductors with max. 20 m cable length are allowed to have not more than 3 signal transfers
in one cable, otherwise this would lead to dangerous malfunctions.
Safety interlock chain (SIC) is often known as closed.
X30 = User Interface UI 300
Maximum cable length
X31 = LSB Option X01-X6+X08: 10 m
X32 = continuous output 1, e.g. air damper X07+X09: 20 m
X33 = continuous output 2, e.g. gas damper X10: 20 m
X34 = continuous output 3 (optional) X20-X21:
20 m
(1)
SIC = safety interlock chain
X22-X23: unlimited X32-X34: 10 m
1
(2)
230 V AC 47 - 63 Hz external fuse protection required (max 10 A slow-blow)
X24: 20 m X31: 1 m
(3)
230 V AC for power supply to external devices
X25-X26: 10 m X30: 1 m
(4)
Fuel selection for dual fuel burners with BT340 + DFM300 see chapter 8.2 Dual Fuel Module DFM300
(5)
Alternative CPI/POC connection see chapter 4.2.3 Optional Connections for the Fuel Line
1 valid for BT300 from SN1801
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