Vaillant ecoMAX 646 Service Manual download pdf (Page 24)

24

fig. 33

GW 612/0

5.6 Initial lighting

•

Check that the boiler combustion

chamber (5, fig. 33) is correctly

fitted.

•

Ensure the cold water shut-off valve

(4, fig. 34) is open by turning

anti-clockwise.

•

Open the gas service valve (2, fig.

34)

•

Check that the CH service valves

(1 and 5, fig. 34) are open.

•

Check that all external heating

controls are calling for heat.

•

Switch on the electricity supply to

the boiler.

•

Set both the maximum hot water

temperature control (4, fig. 33) and

maximum radiator temperature

control (3, fig. 33) to '9'.

•

Turn the boiler on/off control (1,

fig. 33) to the ”on” position ( ).

•

Set the boiler central heating

control (2, fig. 33) to the 'Heating

and Hot Water' position ( ).

The boiler will now operate for central

heating. Allow the boiler to run for a

few minutes to clear any air remaining

in the primary circuit.

(If the boiler should fail to light the

'lock out' indicator will illuminate - see

fig. 41. This usually means that the

gas supply is turned off, or is not

purged of air. Check gas supply, and

turn the central heating control to the

reset position - ( ) - and repeat

lighting procedure).

•

Set the boiler central heating

control to the 'Hot Water only'

position ( ). The boiler will now

switch off.

•

Reset the maximum radiator tempe-

rature control to the required setting

according to Section 5.14.

•

FULLY open a hot water tap. The

boiler will now operate for hot

water.

fig. 34

GW 553/0

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