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General Description
The
Worcester
240
is a combination boiler supplying mains fed
domestic
hot
water plus central heating
at
an
output
of between
9.2 and 16.1 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.
User Controls
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
tempera·
ture 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.
Hot Water Temperature Control
By
slightly reducing
the
flow of
domestic
hot
water
from
the
tap, the temperature of
the
water
will
increase. This is
of
particu-
lar 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.
To
Light
and
Stop
the
Appliance
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
Switch on the mains electricity. Set the room thermostat,
if
fit-
ted, 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 sight-
glass.
Set
the
Operating Switch
(or
programmer) to
the
required posi-
tion.
Set the room thermostat,
if
fitted, to
the
desired temperature_
Set the central heating temperature control knob to give a com-
fortable 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.
The facia
mounted
programmer
will
retain its settings
for
about
four
weeks
after
which
it will
return
to
the
factory
set
pro·
gramme. The display
will
disappear after approx 12 hours.
OVERHEAT
THERMOSTAT
An
overheat
thermostat
is fitted to
the
appliance which inter·
rupts
the
main electrical supply
in
the
event of overheating. This
thermostat
is
reset manually.
If
the
appliance fails to light, check
that
the overheat
thermostat
has
not operated by pressing
the
reset button, See
Fig.1.
Access is gained to the
button
by remov-
ing the cabinet front panel.
If the overheat
thermostat
stops the appliance again call a ser-
vice engineer.
System Operation
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
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.
FLUE
OPERATION
In
cold weather, vapour
may
be emitted from the
flue.
This
is
a
normal operating characteristic
and
no remedial action
is
neces-
sary.
2


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