Manual Worcester-Bosch Combi OF (page 2 of 4) (English)

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The

Worcester 240

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

turned on, hot water

will

become available

continuous supply at a constant temperature, after a short delay,

depending on when the appliance was last

fired.

CENTRAL

HEATING

PROVISION

When a demand

made

for

central heating the burner

will

light

and the appliance automatically match

output

the

system

load.

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

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

shower

turned

on.

OFF

Central heating and

hot

water will remain

off.

HEATING

WATER

The

central heating

will

operate

response

to system controls

and

hot

water

will be

supplied when a tap or shower

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

the

facia

panel

allows

control

the

water

temperature to the radiators.

INDICATOR

LIGHTS

The

POWER

light (amber) indicates

that

the mains electricity

the appliance

on.

The

DEMAND

light (green) indicates

that

the

appliance

supplying either domestic hot water or central

heating.

SYSTEM

PRESSURE

GAUGE

The red needle has been set to show the sealed system pressure

which

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

of particular

advantage

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

obtained.

The

maximum

discharge

temperature of hot water to the taps

preset at the factory.

See

Fig.

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.

sealed systems check

that

the white needle

the pressure gauge

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

for

a further 20 seconds and

then release it

slowly.

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

seconds,

then release

slowly.

Switch on the mains electricity. Set the room thermostat,

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)

the

required

position. Set

the

room

thermostat,

fitted, to

the

desired

temperature.

Set

the

central

heating

temperature

control

knob

to give a

comfortable radiator temperature.

Replace the cabinet front panel.

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

the

gas valve anti·

clockwise to extinguish the pilot.

The

facia mounted programmer

will

retain its settings

for

about

four

weeks

after

which

will

return

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

automatically reset as

the appliance cools down.

The

pilot must be re·lit as described

on the lighting instruction plate.

the

overheat

thermostat

stops

the

appliance again call a

service engineer.

SEALED

WATER

SYSTEM

ensure

that

the

appliance

operates

correctly, a minimum

water operating pressure

must

maintained. The minimum

pressure required

indicated by the red needle on the pressure

gauge located on the facia panel.

the

pressure falls,

the

system

must

be re·pressurised by your

installer. Contact your installer

a maintenance engineer

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

a lower temperature than the bottom then vent it by releasing

air through the vent screw

the top of each radiator.

Refer

the preceding paragraph as excessive venting may cause a drop

the system pressure.

CLEARANCES

Space has been provided around

the

appliance

for

safety and

servicing.

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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Worcester-Bosch Combi OF Manual

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