Vaillant ecoTEC exclusive 835 Installation And Maintenance Instructions Manual page 60

1 Main PCB
2 Control panel PCB
3 All-gas sensor
4 Gas valve assembly
5 Outdoor temperature sensor, flow temperature
sensor (optional, external), DCF receiver
6 Circulation pump remote control
7 Return temperature sensor
8 Flow temperature sensor
9 Fan
10 Surface-mounted thermostat/burner off
11 24 V DC room thermostat
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12 Bus connection (digital room thermostat/control)
13 Prioritising diverter valve
14 Water pressure sensor
15 Warm start sensor
16 Domestic hot water sensor
17 Internal heating circuit flow rate sensor
18 Impeller sensor
19 Internal pump
20 Gas family coding resistor
21 Additional relay (select via D.026)
22 Circulation pump
23 Ignition electrode
Installation and maintenance instructions ecoTEC exclusive 0020193968_05