Vaillant ecoMAX 646 Service Manual download pdf (Page 35)

7.4 Replacement of burner

•

Isolate the boiler from the electrical

supply.

•

Remove front casing as in section

7.1.3.

•

Remove combustion chamber cover

as in section 7.1.5

•

Disconnect the ignition and flame

sensing electrode leads (1, fig. 57).

•

Remove two screws (2, fig 57) and

pull burner forwards to remove.

•

Reassemble in reverse order.

•

Carry out electrical checks (see

section 5.1) and check burner

pressure (see section 5.8) and gas

rate.

7.5 Replacement of electrodes

•

Isolate the boiler from the electrical

supply.

•

Remove front casing as in section

7.1.3, and remove combustion

chamber cover as in section 7.1.5

•

Remove heat exchanger front panel

as in section 7.1.7

•

Pull off HT lead (ignition electrode)

or sensing wire (flame sensing

electrode) (1, fig 57)

•

Depress spring retaining clip (1, fig

58) gently pull electrode up and

clear of burner.

•

To replace the electrode, depress

spring retaining clip (1, fig 58) and

insert electrode until the "V" locates

in the cross support (2, fig 58)

•

Carry out electrical checks (see

section 5.1).

fig. 57

GW 641/0

fig. 58

GW 642/0

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Vaillant ecoMAX 646 Service Manual Page 35

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