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tween the limits of maximum and minimum
output.
Where the demand is at a low level or with
the temperature set to the minimum, it is
normal to see a cycle of lighting and extin-
guishing of the burner when running.
Adjustment
It is advisable to adjust the d.h.w. tempera-
ture to a level commensurate with the de-
mand, minimising the need to mix with cold
water. In this way, the automatic control fa-
cilities will be fully exploited.
Where lime scale is present in the water
supply (hard water areas) it is also advis-
able not to exceed the setting position of the
d.h.w. temperature control knob 9 as indi-
cated in Fig. 2.10. This will help to minimise
the incidences of scale deposits clogging
the domestic hot water heat exchanger of
the boiler.
Fig. 2.10
In these cases, however, it is advisable to
install a small water treatment device or sof-
tener. With such a device you should avoid
periodic de scaling.
Consequently, the d.h.w. heat exchanger will
keep its performance consistent for a longer
period of time with resulting gas savings.
If the demand for d.h.w. is so great as to pre-
vent reaching a high enough temperature,
have the appropriate output limiting valve
installed by your installer or an Authorised
Service Engineer.
INSTRUCTIONS FOR USE
9
2.6
Extinguishing
To turn the boiler off set the function selec-
tor 8 to the position shown in Fig. 2.11.
The appliance operation light 10 will flash
every 4 seconds.
10
Fig. 2.11
When you do not expect to use the boiler for
a long period:
• Switch off the electricity supply to the boil-
er, by means of the fused spur isolation
switch;
• Shut off the gas supply cock 14 and the
valves for the water circuits fitted under
the boiler (Fig. 2.12).
• Empty the water circuits, if necessary, as
shown in the installation instructions in the
section maintenance.
13
Closed position
Fig. 2.12
2.7
Built in time switch A
The combi boilers are equipped with a built
in electronic time switch (5, Fig. 1.3 on page
8
- 13 -
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