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Worcester-Bosch Combi OF Seite 2

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The
Worcester 240
is
a combination boiler supplying mains fed
domestic hot water plus central heating at outputs between 9.2
and 24
kW.
HOT
WATER
PROVISION
When a
tap
is
turned on, hot water
will
become available
in
a
continuous supply at a constant temperature, after a short delay,
depending on when the appliance was last
fired.
CENTRAL
HEATING
PROVISION
When a demand
is
made
for
central heating the burner
will
light
and the appliance automatically match
output
to
the
system
load.
If
the system requires less than 9.2
kW,
the burner
will
light
only periodically to maintain system temperature.
CENTRAL
HEATING
AND
HOT
WATER
PROVISION
Hot water
will
take priority over the supply of heat to the central
heating system.
The appliance facia panel is fitted with
either
an
Operating
Switch or an electronic programmer
for
the control of domestic
hot water and central heating.
The
Operating Switch offers the following settings:
WATER
Hot water will be provided when a
tap
or
shower
is
turned
on.
OFF
Central heating and
hot
water will remain
off.
HEATING
&
WATER
The
central heating
will
operate
in
response
to system controls
and
hot
water
will be
supplied when a tap or shower
is
turned on.
ELECTRONIC
PROGRAMMER
(if
fitted)
Your
installer
will
have mounted the electronic programmer on
the
appliance facia panel. Operating Instructions are supplied
with the programmer.
CENTRAL
HEATING
TEMPERATURE
CONTROL
The
knob
on
the
facia
panel
allows
control
of
the
water
temperature to the radiators.
INDICATOR
LIGHTS
The
POWER
ON
light (amber) indicates
that
the mains electricity
to
the appliance
is
on.
The
DEMAND
light (green) indicates
that
the
appliance
is
supplying either domestic hot water or central
heating.
SYSTEM
PRESSURE
GAUGE
The red needle has been set to show the sealed system pressure
which
is
required for
the
appliance to operate effectively. The
white needle
will
show the actual pressure in the system (sealed
systems only).
By slightly reducing the
flow
of domestic hot water from the tap,
the
temperature of the water
will
increase.
This
is
of particular
advantage
in
the
winter, for example to increase
bath
water
temperature and to remove heavy grease deposits on plates, etc.
Also this
will
provide an added advantage of reducing the delay
before
hot
water
is
obtained.
The
maximum
discharge
temperature of hot water to the taps
is
preset at the factory.
See
Fig.
1.
TO
LIGHT
THE
APPLIANCE
Set
the Operating Switch
(or
programmer) to
OFF.
Switch off the
electricity supply.
Remove the cabinet front panel by lifting up and pulling forward.
Check
that
the
water valves to
the
central heating supply are
open. See
Fig.
1.
On
sealed systems check
that
the white needle
on
the pressure gauge
is
not below the required pressure.
Light the pilot by pressing the grey button on the gas valve and
operating the red spark generator button. When the pilot has
lit
continue to hold the grey button
in
for
a further 20 seconds and
then release it
slowly.
If
the pilot does not stay alight, twist the gas valve button anti·
clockwise.
Wait
for
three minutes and repeat the operation until the pilot
has lit. Continue to hold the gas valve button for
30
seconds,
then release
it
slowly.
Switch on the mains electricity. Set the room thermostat,
if
fitted,
to maximum.
Turn
the central heating temperature control knob
to max.
Set the Operating Switch
(or
programmer) to
HEATING
&
WATER.
The
burner
will
light and can be seen through the view point.
Set
the
Operating Switch (or
programmer)
to
the
required
position. Set
the
room
thermostat,
if
fitted, to
the
desired
temperature.
Set
the
central
heating
temperature
control
knob
to give a
comfortable radiator temperature.
Replace the cabinet front panel.
TO
STOP
THE
APPLIANCE
For Short Periods
Set the Operating Switch
(or
programmer) to the
OFF
position.
For Long Periods
Set the Operating Switch (or programmer) to
OFF.
Switch
off
the
mains electricity. Turn
the
grey
button
on
the
gas valve anti·
clockwise to extinguish the pilot.
The
facia mounted programmer
will
retain its settings
for
about
four
weeks
after
which
it
will
return
to
the
factory
set
programme.
The
display
will
disappear after approximately 12
hours.
OVERHEAT
THERMOSTAT
The
overheat thermostat interrupts the pilot gas supply in the
event of overheating. The thermostat
is
automatically reset as
the appliance cools down.
The
pilot must be re·lit as described
on the lighting instruction plate.
If
the
overheat
thermostat
stops
the
appliance again call a
service engineer.
SEALED
WATER
SYSTEM
To
ensure
that
the
appliance
operates
correctly, a minimum
water operating pressure
must
be
maintained. The minimum
pressure required
is
indicated by the red needle on the pressure
gauge located on the facia panel.
If
the
pressure falls,
the
system
must
be re·pressurised by your
installer. Contact your installer
or
a maintenance engineer
if
the system continues to lose pressure as this may indicate a
leak.
CENTRAL
HEATING
SYSTEM
During the first operation of
the
central heating system check
that
all
radiators are heated evenly. If the top of the radiator
is
at
a lower temperature than the bottom then vent it by releasing
air through the vent screw
at
the top of each radiator.
Refer
to
the preceding paragraph as excessive venting may cause a drop
in
the system pressure.
CLEARANCES
Space has been provided around
the
appliance
for
safety and
servicing.
It
is
important
that
you do not restrict this space.
The
minimum clearances are:
Open
flue
-
Left
hand side - 1
OOmm;
Right hand side - 1
OOmm;
Top
-300mm; Bottom -230mm; Front -600mm.
Balanced
Flue
-
Left
hand side -Smm; Right hand side -Smm;
Top
- 1
OOmm;
Bottom -230mm; Front -600mm.
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