Bosch Worcester 28CDi Bedienungsanleitung

24CDi, 28CDi & 35CDi II

COMBI

USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

G.C. NUMBERS

APPLIANCE NATURAL GAS L.P.G.

24CDi Fanned Flued (RSF) 47 311 30 47 311 31

24CDi Balanced Flued (BF) 47 311 29

24CDi Open Flued (OF) 47 311 32 47 311 33

28CDi Fanned Flue (RSF) 47 311 34 47 311 35

35CDi II Fanned Flue (RSF) 47 311 58 47 311 59

Vote for your

‘Installer of the year’ at

www.worcester-bosch.co.uk

Worcester supports the

Benchmark code of practice

EXCELLENCE COMES

AS STANDARD

Thank you for purchasing a Worcester CDi gas-fired combi-

nation appliance.

The CDi appliances are made by Worcester and the strictest

quality control standards are demanded throughout every stage

of production.

Indeed, Worcester, part of the Bosch Group have led the

field in innovative appli-

ance design and perform-

ance for more than 40

years.

The result is

that your new Worcester

CDi appliance offers you

the very best of every-

thing - quality, efficiency,

economical running costs,

proven reliability and

value for money.

What’s more, you also have the assurance of our no-

nonsense 1 year parts and labour guarantee.

And, to keep your boiler operating at peak condition and

efficiency, an optional maintenance scheme is available from

Worcester. Contact our Service Contracts team on 01905 754624

for further details.

Page No.

Operating Instructions

.................................... 3-11

Fault and Breakdowns 12

Maintenance and

Extended Warranty

Information ............ 13-14

Guarantee Details .. 15-16

CONTENTS

GENERAL

INFORMATION

GAS SAFETY (INSTALLATION AND USE)

REGULATIONS 1998

It is the law, in GB, that all gas appliances must be installed by a

competent person in accordance with the above regulations. Failure

to install appliances correctly could lead to prosecution. It is in your

interest and that of safety to ensure compliance with the law. The

manufacturer’s notes must not be taken, in any way, as over-riding

statutory obligations.

In GB, a competent person is someone registered with CORGI.

All CORGI registered installers carry a CORGI ID card and have a regis-

tration number. Both should be recorded in the BENCHMARK check-

list. You can check that your installer is CORGI registered by calling

CORGI on 01256 372300.

WARNING: This appliance must be earthed and protected by a 3

amp fuse.

ELECTRICITY SUPPLY: 230V ~ 50Hz

IMPORTANT: To get the best from your Worcester CDi please read

these instructions carefully.

NOTE: In the event of a fault the appliance should not be used

until the fault has been corrected by a competent person.

BENCHMARK

The Benchmark initiative is a code of practice to encourage

the correct installation, commissioning and servicing of domestic cen-

tral heating boilers and system equipment.

A checklist can be found in the back of every installation

manual. This is a vital document that needs to be completed by the

installer at the time of installation. It confirms that the boiler has

been installed and commissioned according to the manufacturers

instructions.

In Eire the declaration found in IS 813 must be complet-

ed. Without completion of the checklist and/or declaration, manufac-

turers may refuse to respond to a call-out request. It is important that

the checklist and/or declaration are fully completed by your installer.

GENERAL DESCRIPTION

(See Fig.1.)

The WORCESTER CDi MODELS are combined domestic hot water

and central heating appliances. They consist of a gas fired boiler having

a varying output of between:

CH DHW

24CDi 9.0 - 24kW 9.0 - 24kW

28CDi 9.0 - 24kW 9.0 - 28kW

35CDi II 10.5 - 27.5kW 9.5 - 35.3kW

a heat exchanger to provide domestic hot water via the boiler, cir-

culating pump and water diverting valve. All the necessary controls to

provide mains fed domestic hot water and central heating.

The appliances are supplied as standard with a manual operating

switch. Alternatively a facia mounted programmer may have been fitted.

The appliances can operate in one of two modes. Hot water only or

hot water and central heating.

Hot Water Mode:

The appliance operates to supply only domestic hot water when

the heating temperature mode is fully anti-clockwise, at the –posi-

tion or the timer is programmed to OFF mode.

A flow restrictor is fitted within the appliance which limits a hot

water delivery rate to a maximum of:

24CDi 9.0 (±15%) litres/minute

28CDi 10.0 (±15%) litres/minute

35CDi II 12.0 (±15%) litres/minute

Hot Water and Central Heating mode:

When a demand is made

for heating by the system con-

trols (i.e. a programmer or

room thermostat), the pump

will energise, circulating pri-

mary water around the heat-

ing system and the burner

will light. The heat output

from the appliance in this

mode has been factory set to

maximum. The appliance will

operate as necessary to main-

tain the temperature of the

radiators at the level set by

the adjustment of the Heating

Temperature Control Knob.

(See Fig. 2.)

If the system no longer

requires output to maintain

the desired room tempera-

ture, the burner will extin-

guish. The pump will contin-

ue to run for a short period to

dissipate the residual heat

from the appliance and then

switch off.

The appliance will sup-

ply heat to the central heating

system as required. A demand

for hot water at a tap or show-

er will override the central

heating function for the peri-

od of the domestic hot water

demand.

Fig. 1. System Diagram.

Automatic air

vent

Gas to water

heat exchang-

Circulating

pump

Water to

water heat

exchanger

Diverter valve

flow

Domestic

hot water

out

Domestic

cold sup-

ply

return

Safety dis-

charge

Pressure

relief valve

Boiler

Expansion

vessel

CENTRAL HEATING SYSTEM

During the first few hours of operation of the central heating

system, check that all radiators are being heated at an even rate.

Should the upper area of a radiator be at a lower temperature than

the base of the radiator, it should be vented by releasing air through

the venting screw at the top of each radiator. Make sure your installer

shows you how to carry out the operation. Repeated venting will

reduce the quantity of water in the system and this must be replen-

ished for safe and satisfactory operation of the appliance. Should

water leaks be found in the system or excessive venting be required

from any radiator, your installer or heating engineer should be con-

tacted and the system corrected.

SEALED HEATING SYSTEM

The appliance can be fitted to a sealed heating sys-

tem which is pre-pressurised. In this case your installer

will advise you on the minimum and maximum pres-

sure that should be indicated on the pressure gauge. See

Fig. 2. Check regularly that this pressure is maintained

and contact your installer or maintenance engineer if

there is a permanent significant drop in pressure indi-

cated on the gauge. If the system loses pressure it

should be re-pressurised as instructed by the installer

(N.B. Maximum operating pressure 2.5 bar).

Re-pressurising The System (See Fig. 1a).

(If in doubt leave this procedure to your installer).

Remove the bottom panel to gain access to the fill-

ing loop assembly.

Insert the bayonet end of the filling key into the

corresponding cut outs in the filling loop housing and

twist to lock the key in place.

Turn the grey knob anti-clockwise to allow water

ingress and fill until the required pressure is reached.

Turn the grey knob clockwise to stop filling and

remove the filling key by lining up the bayonet end of

the key with the cut outs in the filling loop housing and

withdrawing the key.

N.B. The key must always be removed from the

filling loop housing after the system has been filled to

prevent accidental filling and to comply with Bylaw 14

of the Water Bylaws Scheme.

Store the key in a safe place for future use and

refit the bottom panel.

OPEN VENTED HEATING SYSTEM

The appliance may be fitted to an open vented

heating system your installer will advise you. There is

no need to observe the pressure gauge.

GENERAL NOTES

Fig. 1a.

Grey

Knob

Filling Key

CLEARANCES

Minimum clearances in millimetres.

Your installer will have provided adequate space around the

appliance for safety and servicing. Do not restrict this space by the

addition of cupboards, shelves etc. close to the appliance.

ROOM THERMOSTAT

A room thermostat may be fitted for control of the central heat-

ing temperature. It will be located in one room of the home. The

method of setting a room thermostat varies with the type and manu-

facture. Refer to the instructions supplied with the room thermostat.

THERMOSTATIC RADIATOR VALVES

If thermostatic radiator valves are fitted to the system then they

must conform to the requirements of BS2767. The radiator located in

the room where the room thermostat is sited must be controlled by a

thermostatic radiator valve.

SHOWERS, BIDETS, TAPS AND MIXING

VALVES

Standard hot and cold taps and mixing valves used with the

appliance must be suitable for operating at mains pressure.

Thermostatically controlled shower valves will guard against the flow

of water at too high a temperature.

If using a pressure equalising valve, set the Domestic Hot Water

temperature control knob to the ‘MAX’ position.

Hot and cold mains fed water can be supplied direct to an over-

rim flushing bidet subject to local water company requirements.

With all mains fed systems the flow of water from the individ-

ual taps will vary with the number of outlets operated simultaneous-

ly and the cold water mains supply pressure to the property. Flow bal-

ancing using ‘Ball-o-Fix’ type valves is recommended to avoid an

excessive reduction in flow to individual outlets.

For further information contact The Worcester Technical

Helpline. 08705 266241

HOT AND COLD FLOW

The flow of water demanded from both hot and cold service out-

lets is dependent upon mains supply, it may not be possible in some

installations to operate all outlets simultaneously.

WATER MAINS FAILURE

It is important to note that in the event of a mains water supply

failure, no tap water will be available until the mains supply is

restored. The appliance can still be used for heating provided that the

system is of the sealed system type. Open vent central heating sys-

tems should be turned off until the supply is restored.

USE IN HARD WATER AREAS

Normally there is no need for scale protection. However, in areas

of exceptionally hard water supply it is recommended that an In-Line

scale inhibitor be fitted.

Installation should be strictly in accordance with the require-

ments of the local Water Company. An isolating valve to facilitate

servicing should be incorporated.

24,28CDi RSF 35CDi II 24CDi OF 24CDiBF

Left-hand side 10 10 10 10

Right-hand side 10 10 10 10

In Front 600 600 600 600

Above 180 180 300 100

Below 200 200 200 200

The water hardness may be determined using the standard test

paper or by reference to the local Water Company.

Further information may be obtained from Worcester Bosch

Technical Helpline.

AIR SUPPLY FOR OPEN FLUED (O.F.)

APPLIANCES

Your installer will have made arrangements for an adequate sup-

ply of fresh air to the appliance. Fresh air is required for combustion.

Do not block up any air ways which may be let into a wall or door. Do

not hang clothes or other combustible materials over the appliance or

against the flue pipe.

NOTE: Do not place anything on top of the appliance. If the

appliance is fitted in a compartment do not use the compartment for

storage purposes unless it conforms to the requirements of

BS 6798:1987: Section 6. In particular, the flue pipe should not pass

through an airing cupboard space unless protected by a guard (such as

wire mesh) concentrically spaced 13mm (1/2in), as described in BS 6798:1987.

VENTILATION OF BALANCED FLUED (BF)

AND ROOM SEALED FANNED FLUE (RSF)

APPLIANCES

These are room sealed appliances and any ventilation openings

in a wall or door must not be obstructed. Do not allow the flue termi-

nal fitted on the outside wall to become obstructed or damaged.

NOTE: Do not place anything on top of the appliance. If the

appliance is fitted in a compartment do not use the compartment for

storage purposes unless it conforms to the requirements of

BS 6798:1987: Section 6. It is essential that the airing space is separat-

ed from the boiler space by a perforated non-combustible partition as

described in BS 6798:1987.

CIRCULATING PUMP

This may be fitted with a speed adjuster. If so it will be factory

set at maximum and should not be changed.

FROST PRECAUTIONS

If the appliance is not to be used for a long period of time and

there is a likelihood of freezing, then the appliance should be

drained. The Worcester Technical Helpline will advise you on suit-

able frost precautions. For short periods, the built-in frost protection

of the appliance will be adequate.

SERVICE

Annual servicing is important to ensure continuing high efficiency

and long life of your appliance. Suitable servicing arrangements should be

made with a competent third party. In the event of any difficulty in making

suitable service arrangements, Worcester personnel will be happy to dis-

cuss regular servicing and offer a comprehensive maintenance contract.

IMPORTANT: Do not touch or adjust any sealed compontent.

WARNING

If a gas leak exists, or is suspected, turn off the gas supply to the

appliance at the service cock and consult your local service engineer.

Do not touch any electrical switches to turn them either on or off.

Open all windows and doors. Do not smoke. Extinguish all naked

lights.

CLEANING

Do not use abrasive cleaners on the outer casing. Use a damp

cloth and a little detergent.

OPERATION OF

CONTROLS

OPERATING SWITCH

In the ‘’position there is no mains electricity to the

appliance.

In the ‘I’ position mains electricity is connected to the

appliance.

CENTRAL HEATING TEMPERATURE

CONTROL

The position of this knob will determine the temperature of the

water delivered to the radiators between the ‘I’ and ‘MAX’ position.

When the knob is turned anti-clockwise past the ‘I’ position towards

the ‘’(Summer Position), then the appliance will operate in the

HOT WATER mode only and no heat will be delivered to the radia-

tors.

DOMESTIC HOT WATER TEMPERATURE

CONTROL

The position of this knob will determine the temperature of the

water delivered at the domestic hot water taps between the ‘’and

the ‘MAX’ position.

By slightly reducing the flow of domestic water from the tap, the

delivery temperature of the water will be further increased. This is of

particular advantage in the winter, for example to increase bath water

temperature. Also this will provide an added advantage of reducing

the delay before hot water is obtained.

FACIA MOUNTED PROGRAMMER (if fitted)

Your installer may have mounted either a mechanical or an elec-

tronic programmer into the facia of your appliance. Operating instruc-

tions are supplied with the programmer.

RESET BUTTON

Press this button in for five seconds if any of the indicator lights

are flashing slowly.

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 grey

needle will show the actual pressure in the system. This does not

apply to any open vent system.

INDICATOR LIGHTS

Mains electricity indicator:

OFF : No mains electricity to the appliance

ON : Mains electricity is connected to the

appliance

Central heating demand indicator:

OFF : No demand for heat to the central

heating circuit

ON : Central heating demand

FLASHING SLOW : Ignition lockout

(once per second)

FLASHING FAST : Appliance fault (other than ignition

(five times per second) lockout)

Domestic hot water demand indicator:

OFF : No demand for domestic hot water

ON : Domestic hot water demand

FLASHING FAST : Air flow fault (RSF). Flue gas spillage

(OF)

(five times per second)

Central heating and domestic hot water demand indicators:

BOTH FLASHING SLOW : Overheat cut-off

(once per second)

Flame detection indicator:

OFF : Burner off

ON : Burner on

Fig. 2. Controls.

Operating

switch

Mains

electricity

indicator

Reset

button

Flame detection

indicator

DHW demand

indicator

Central heating

demand indicator

CH temperature

control knob

DHW temperature

control knob

Sealed system pressure

gauge

TO LIGHT THE APPLIANCE

Check that the water valves to the central heating circuit are open.

On sealed systems check that the grey needle on the pressure

gauge is not below the required pressure.

Switch on the mains electricity. The green power on indicator will

light. Set the room thermostat, if fitted, to maximum. Turn the central

heating temperature control knob to ‘MAX’. The red central heating

demand indicator will light.

The burner will light and the red flame detection indicator will light.

Set the central heating and hot water temperature control knobs

and the room thermostat, if fitted, to the desired temperature.

TO STOP THE APPLIANCE

For Short Periods

Turn the central heating temperature control knob fully anti-

clockwise to the ‘’position.

For Long Periods

Turn the operating switch to the ‘’position. Switch off the

mains electricity.

A facia mounted electronic programmer will retain its settings for

about two weeks, after which it will return to the factory set

programme. The display will disappear

after approximately 12 hours.

A facia mounted mechanical

programmer will require resetting once

the operating switch has been set to ‘O’,

or the mains supply has been

disconnected.

ELECTRICITY SUPPLY

FAILURE

If the electricity supply fails the

appliance will not operate. Once the

supply is restored the appliance will

return to normal operation. If a

programmer is fitted, check that the

settings have been maintained.

OVERHEAT CUT-OFF

THERMOSTAT

The appliance will enter a lockout

condition in the event of overheating.

An overheat cut-off thermostat is

fitted to the appliance which will

interrupt the electricity supply to the gas

valve.

If the overheat cut-off has operated,

both the central heating and the hot

water demand indicators will flash

together.

Fig. 3. CDi with front panel removed.

Circulating

pump

Clip

Locating peg

Expansion

vessel

Gas valve

TO LIGHT AND STOP THE

APPLIANCE

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