0020308118_05 Installation and maintenance instructions 97
7 Flow temperature sensor
8 Surface-mounted thermostat/Burner off
9 24 V DC room thermostat
10 Bus connection (system control/digital room thermo-
stat)
11 Water pressure sensor
12 Cylinder temperature sensor (optional)
13 C1/C2 cylinder contact (optional)
14 Ignition transformer
15 Ignition electrode
16 Control electrode
17 Outdoor temperature sensor, flow temperature
sensor (optional, external), DCF receiver
18 Circulation pump remote control
19 Control module
20 Communication unit
21 Internal pump
22 Main power supply
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