Baxi SCB-17, User And Installation Manual

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2.2 General description of the SCB-17
Two extra zones can be connected to the SCB-17 expansion board.
Expansion boards are automatically recognised by the control unit of the boiler. If expansion boards are removed, the boiler will
show an error code. To solve this error, an auto-detect must be carried out after removal.
SCB-17 board
1
Three-way valve – Circuit C
2 Pump and safety thermostat – Circuit C
3 Pump – Circuit B
4 Solar sensor
(*)
5 Flow temperature sensor - Circuit C
6 Flow temperature sensor - Circuit B
7 Ambient sensor – Circuit C
8 Ambient sensor – Circuit B or Solar PWM
(*)
9 L-BUS Connector
10 L-BUS Connector
11 Rotary button for identification
12 230VAC input power supply
(*)
Solar functions not used on SCB-17
2.3 Identification number
There is a rotary button on the SCB-17, which can be used to number select an identification number for the PCB. If multiple
SCB-17 boards are in use, each PCB can have a unique number for identification.
Rotary button for identification
4 5 6 7 8
1
2 3
10 9 11
12