Vaillant ecoTEC exclusive 627 Installation And Maintenance Instructions Manual page 57

1 Main PCB
2 Operator 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 Contact thermostat/burner off
11 24 V DC room thermostat
0020193966_04 ecoTEC exclusive Installation and maintenance instructions
12 Bus connection (digital room thermostat/control)
13 Prioritising diverter valve
14 Water pressure sensor
15 Cylinder temperature sensor
16 Cylinder contact "C1/C2"
17 Internal heating circuit flow rate sensor
18 Internal pump
19 Gas family coding resistor
20 Additional relay (select via D.026)
21 Circulation pump
22 Ignition electrode
57