•
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
it will attempt re-ignition after an
approximate delay of 10 seconds, if
the boiler fails to light at the 2nd
attempt 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 hea-
ting control to the reset position ( )
and repeat the lighting procedure.
0
°
C
30
60
90
120
0
4
3
2
1
bar
8
9
7
6
5
4
3
2
1
8
9
7
6
5
4
3
2
1
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
849/1
Burner lock out indicator
Flame indicator
Ignition indicator
Fan operation indicator
Central heating demand indicator
Hot water demand indicator
Power on indicator
