Vaillant VCW 2O Instructions For Installation And Servicing page 3

l Fkrcorinection
2 Down draught diverter
3 Sensorof overheat cut-off device
4 Mainheatexchanger
4a Combustion chamber
5 Main hrmer
6 Gasgovernor
7 Flowswitch
8 Differential valve
9 DC solenoid
10 Fbwthermometer
11 Pump with automatic air vent
12 Pressuregauge
\a-
l
air vent points
Terminal box
Switch board (main switch, heating
switch, domestic hot water switch)
Domestic heat exchanger
Flowthermostat
Pressure relief valve
Service cock
Gas service cock
Overflow (optional extra)
Push button start
Push button stop
Pilot burner
Piezo unit
1 3
1 4
1 5
1 7
' 1 8
1 9
20
2 1
22
23
24
25
o
o
'6
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