Bosch 35CDI II User Manual

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24CDi, 28CDi & 35CDi II COMBI

Worcester supports the

Benchmark code of practice

 

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

USER INSTRUCTIONS & CUSTOMER CARE GUIDE

EXCELLENCE COMES

AS STANDARD

Thank you for purchasing a Worcester CDi gas-firedcombination 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 appliance design and performance for more than 40 years.

The result is that your new Worcester CDi appliance offers you the very best of everything - quality, efficiency, economical running costs, proven reliability and value for money.

What’s more, you also have the assurance of our nononsense 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.

CONTENTS

Page No.

Operating Instructions

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

Fault and Breakdowns 12

Maintenance and

Extended Warranty

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

Guarantee Details .. 15-16

2

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-ridingstatutory obligations.

In GB, a competent person is someone registered with CORGI. All CORGI registered installers carry a CORGI ID card and have a registration number. Both should be recorded in the BENCHMARK checklist. 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 central 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 completed. Without completion of the checklist and/or declaration, manufacturers may refuse to respond to a call-outrequest. 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, circulating 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.

3

Hot Water Mode:

The appliance operates to supply only domestic hot water when the heating temperature mode is fully anti-clockwise,at theposition 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:

Fig. 1. System Diagram.

Automatic air vent

Gas to water heat exchanger

Boiler

Circulating

pump Expansion vessel

Water to

Pressure

water heat

relief valve

exchanger

 

Diverter valve

CH

Domestic

Domestic CH

Safety dis-

flow

hot water

cold supreturn

charge

 

out

ply

 

When a demand is made for heating by the system controls (i.e. a programmer or room thermostat), the pump will energise, circulating primary water around the heating 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 maintain 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 temperature, the burner will extinguish. The pump will continue to run for a short period to dissipate the residual heat from the appliance and then switch off.

The appliance will supply heat to the central heating system as required. A demand for hot water at a tap or shower will override the central heating function for the period of the domestic hot water demand.

4

GENERAL NOTES

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 replenished 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 contacted and the system corrected.

Fig. 1a.

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-pressurisedas instructed by the installer

 

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

 

Re-pressurisingThe 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

Grey

twist to lock the key in place.

Turn the grey knob anti-clockwiseto allow water

Knob

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

Filling Key

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.

5

CLEARANCES

 

24,28CDi RSF

35CDi II

24CDi OF

24CDiBF

 

 

 

 

 

Left-handside

10

10

10

10

Right-handside

10

10

10

10

In Front

600

600

600

600

Above

180

180

300

100

Below

200

200

200

200

 

 

 

 

 

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 heating temperature. It will be located in one room of the home. The method of setting a room thermostat varies with the type and manufacture. 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 overrim flushing bidet subject to local water company requirements.

With all mains fed systems the flow of water from the individual taps will vary with the number of outlets operated simultaneously and the cold water mains supply pressure to the property. Flow balancing 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 outlets 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 systems 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

6

servicing should be incorporated.

 

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 supply 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 terminal 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 separated from the boiler space by a perforated non-combustiblepartition 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 suitable frost precautions. For short periods, the built-infrost 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 discuss 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.

7

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 turnedanti-clockwisepast 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 radiators.

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 electronic programmer into the facia of your appliance. Operating instructions 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.

8

INDICATOR LIGHTS

Mains electricity indicator:

OFF : No mains electricity to the applianceON : Mains electricity is connected to the

appliance

Central heating demand indicator:

OFF : No demand for heat to the central heating circuit

ON : Central heating demandFLASHING 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 waterON : 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.

 

DHW demand

 

 

Central heating

 

indicator

Flame detection

 

 

demand indicator

Reset

 

indicator

 

 

button

 

 

 

 

 

 

 

 

 

Mains

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

electricity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating

CH temperature

DHW temperature

Sealed system pressure

switch

control knob

control knob

gauge

9

Clip
Circulating pump
Locating peg

TO LIGHT AND STOP THE

APPLIANCE

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 anticlockwise 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

Fig. 3. CDi with front panel removed.

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

Expansion

supply is restored the appliance will

vessel

return to normal operation. If a

 

programmer is fitted, check that the

 

settings have been maintained.

 

OVERHEAT CUT-OFF

Gas valve

THERMOSTAT

 

The appliance will enter a lockout

 

condition in the event of overheating.

 

An overheat cut-offthermostat is

 

fitted to the appliance which will

 

interrupt the electricity supply to the gas

 

valve.

 

If the overheat cut-offhas operated,

 

both the central heating and the hot

 

water demand indicators will flash

 

together.

10