90 Installation and maintenance instructions 0020308121_04
9 Surface-mounted thermostat/Burner off
10 24 V DC room thermostat
11 Bus connection (system control/digital room thermo-
stat)
12 Water pressure sensor
13 Prioritising diverter valve
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
22 230 V power supply, fan
23 Main power supply
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