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USE
INSTRUCTIONS FOR USE
eration of the boiler, switch off the boiler
immediately at the fused spur isolation
switch and contact your Installer or an ap-
proved Service Engineer.
Air introduced into the boiler during this filling
process will vent through the automatic air
purger fitted to the boiler. You may also find
it necessary to vent air from your radiator cir-
cuit using your radiator key, however be aware
that excessive venting will cause the pressure
in the system to drop.
Always ensure that the pressure gauge is set
at the required pressure.
2.3 Ignition
• Check that the valves located in the lower
part of the boiler are open Fig. 2.3.
Fig. 2.3
Open
position
• Turn on the electricity supply to the boiler
switching on the fused spur isolation switch.
The appliance operation light 9 (Fig. 2.4) will
flash every 4 seconds (stand-by condition).
• To operate the boiler, position the function
selector 7 as in Fig. 2.4. The appliance op-
eration light 9 will flash every 2 seconds (op-
erating boiler).
Fig. 2.4
9
7
2.4 C.h. circuit temperature
The output temperature of c.h. water is ad-
justable from a minimum of about 25°C to a
maximum of about 85°C (Fig. 2.5), by turning
the knob 7.
Adjustment of the boiler temperature alters
the gas flow at the burner according to the
thermal demand in the system. So it is usual
to see the burner lit at the minimum level for
more or less long periods.
The following instructions indicate how to set
the output temperature of the c.h. water de-
pending on the outside temperature.
Fig. 2.5
Minimum
Maximum
Adjustment of temperature WITHOUT the
external temperature probe (optional) fit-
ted
In order to achieve optimal settings for econo-
my and comfort, we recommend adjusting the
operating temperature of the c.h. water ac-