Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 65

3 Gas valve assembly
4 Temperature sensor in the heating flow
5 Temperature sensor in the heating return
6 Pressure switch
7 Control signal for the fan
8 Plug that is enclosed with the system control (op-
tional)
9 Temperature sensor for the low loss header (op-
tional)
10 Plug for the domestic hot water cylinder's temperat-
ure sensor (optional)
0020261389_03 ecoTEC plus Installation and maintenance instructions
11 Plug for the domestic hot water cylinder's contact
(optional)
12 Water pressure sensor
13 Heating pump control signal
14 Control of the optional relay D.026
15 Power supply for the prioritising diverter valve or
domestic hot water charging pump (optional)
16 Fan power supply
17 Power supply for the heating pump
18 Igniter
19 Ignition electrode
65