Vaillant ecoMAX 646 Service Manual download pdf (Page 40)

40

fig. 69

GW 607/0

fig. 70

GW 646/0

fig. 71

GW 647/0

7.13 Replacement of automatic

air release

•

Turn off boiler as in section 7.1.1.

•

Remove front casing as in section

7.1.3.

•

Release CH water pressure and

drain boiler as in section 7.1.2.

•

Lower front control panel as in

section 7.1.6.

•

Unscrew cap (2, fig. 68) of auto air

release and remove inner

components.

•

Replace with new inner

components and reassemble in

reverse order.

•

Refill and repressurise the boiler

(see section 5.4).

7.14 Replacement of automatic

bypass

•

Turn off boiler as in section 7.1.1.

•

Remove front casing as in section

7.1.3.

•

Release CH water pressure and

drain boiler as in section 7.1.2.

•

Lower front control panel as in

section 7.1.6.

•

Remove spring clip (1, fig. 66).

•

Disconnect wires from overheat

thermostat (2, fig. 66).

•

Remove temperature gauge phial

from primary flow pipe.

•

Undo unions (3, fig. 66). Remove

bypass/connecting pipe.

•

Undo union (1, fig. 69) to remove

bypass.

•

Reassemble in reverse order using

sealing washers supplied.

•

Refill and repressurise the boiler

(see section 5.4).

7.15 Replacement of diverter

valve

•

Turn off boiler as in section 7.1.1.

•

Remove front casing as in section

7.1.3.

•

Release CH water pressure and

drain boiler as in section 7.1.2.

Open hot water taps.

•

Lower front control panel as in

section 7.1.6.

•

Remove pump as in 7.12

•

Remove three screws (1, fig. 70)

and pump support bracket (2, fig.

70).

•

Remove clip and disconnect pressure

tube (1, fig. 71) from diverter valve.

•

Undo nut (2, fig. 71) and

disconnect pressure guage tube.

•

Disconnect union (6, fig. 71).

•

Disconnect electrical connections

from DHW microswitch (3, fig 71).

•

Remove clip (4, fig. 71) by pulling

down.

•

Undo two unions (5, fig. 71).

•

Undo union (3, fig. 72).

•

Carefully pull diverter valve and

cold water inlet pipe away from

DHW heat exchanger Lift valve and

cold water inlet pipe (1, fig. 72)

out of boiler.

•

Reassemble in reverse order.

•

Carry out electrical checks (see

section 5.1).

•

Refill and repressurise the boiler

(see section 5.4).

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