Vaillant ecoMAX 646 Service Manual download pdf (Page 27)

•

The gas valve will open and spar-

king will commence at the burner.

The ignition indicator will

illuminate.

•

As soon as the burner has ignited

and the flame has been sensed the

flame indicator will illuminate.

•

By illuminating in this sequence the

indicator lights have demonstrated

correct operation of the boiler for

CH.

Note : Should the boiler fail to light

the burner lock out indicator will

illuminate. This usually means that the

gas supply is turned off or has not

been purged of air. Check the gas

supply, turn the central heating

control to the reset position ( ) and

repeat the lighting procedure.

27

5.10 Functional Checks

5.10.1 Introduction

The Vaillant TURBOmax is equipped

with a set of diagnostic indicator lights

to show the operational status of the

boiler. A functional check of DHW

and CH operation can be made using

these indicator lights (fig. 41).

5.10.2 Functional check of domestic

hot water

•

Ensure that the power on indicator

is illuminated.

•

Set the boiler central heating

control to the 'Hot Water only'

position ( ).

•

Turn on a hot tap and draw water

at a high rate.

•

The hot water demand indicator

will illuminate.

•

The appliance will start its lighting

sequence. Once the fan and flue

system has proved itself, the fan

operation indicator will light.

•

The gas valve will open and

sparking will commence at the

burner. The ignition indicator will

illuminate.

•

As soon as the burner has ignited

and the flame has been sensed the

flame indicator will illuminate.

•

By illuminating in this sequence the

indicator lights have demonstrated

correct operation of the boiler for

DHW.

5.10.3 Functional check of central

heating

•

Ensure that the power on indicator

is illuminated.

•

Set the boiler central heating

control to the 'Central Heating and

Hot Water' position ( ).

•

Ensure external controls are calling

for heat.

•

The central heating demand

indicator will illuminate.

•

Providing the boiler has not

achieved its set temperature, and

the anti cycling control is not

activated, the boiler will start its

lighting sequence. Once the fan

and flue system have proved their

satisfactory operation the fan

operation indicator will light.

fig. 41

GW 618/0

Burner lock out indicator

Flame indicator

Ignition indicator

Fan operation indicator

Central heating demand indicator

Hot water demand indicator

Power on indicator

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