Vaillant ecoMAX 646 Service Manual download pdf (Page 41)

41

7.15.1 Replacement of water section

diaphragm (fig. 72).

•

Turn off boiler as in Section 7.1.1.

•

Remove bottom cover as in section

7.1.3.3.

•

Open hot water taps.

•

Remove clip (2), undo union (3)

•

Remove 6 screws (4).

•

Pull water section base away from

DHW heat exchanger and drop

down.

•

Remove diaphragm.

•

Replace in reverse order.

•

Carry out electrical checks (see

section 5.1).

•

Refill and repressurise the boiler

(see section 5.4).

7.16 Replacement of pressure

and temperature gauge

•

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.

•

Undo union (2, fig 71) on diverter

valve to release pressure gauge

tube.

•

Remove temperature gauge phial

from pocket on primary flow pipe.

•

Press spring clips on side of gauge

to remove from front panel.

•

Replace in reverse order.

•

Refill and repressurise the boiler

(see section 5.4).

7.17 Replacement of differential

pressure switch

•

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 clip at rear of switch by

pulling it to the left.

•

Disconnect wires from switch (1,

fig. 73).

•

Pull pressure differential switch

forward to remove.

•

Reassemble in reverse order.

•

Carry out electrical checks (see

section 5.1).

•

Refill and repressurise the boiler

(see section 5.4).

fig. 72

GW 635/0-a

fig. 73

GW 649/0

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 59 60

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