Key For The Basic System Diagrams - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

F.3

Key for the basic system diagrams

Component Meaning
1 Heat generator
3 Heat generator circulation pump
3c Cylinder charging pump
3e Circulation pump
3f Heating pump
5 Monovalent domestic hot water cylinder
8a Expansion relief valve
8b Potable water expansion relief valve
Safety group – drinking water connection
8c
8e Heating diaphragm expansion vessel
Diaphragm expansion vessel – potable water
8f
9a Single-room temperature control valve (thermostatic/motorised)
9c Flow regulator valve
9e Domestic hot water generation prioritising diverter valve
9h Filling/draining cock
9j Tamper-proof capped valve
9k 3-port mixing valve
10c Non-return valve
10e Line strainer with magnetite separator
10h Low loss header
12 System control
12a Remote control unit
12d Expansion/wiring centre
12k Limit thermostat
12m Outdoor temperature sensor
DHW Cylinder temperature sensor
FS2 Heating circuit volume temperature sensor
SysFlow System temperature sensor
Components that have been used multiple times (x) are numbered consecutively (x1, x2, ..., xn).
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Installation and maintenance instructions ecoTEC plus 0020261389_03