Bosch Appliances Boiler 28CDI User Manual

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24CDi, 28CDi & 35CDi II  
COMBI  
Worcester supports the  
Benchmark code of practice  
G.C. NUMBERS  
APPLIANCE  
NATURAL GAS  
47 311 30  
47 311 29  
47 311 32  
47 311 34  
47 311 58  
L.P.G.  
24CDi Fanned Flued (RSF)  
24CDi Balanced Flued (BF)  
24CDi Open Flued (OF)  
28CDi Fanned Flue (RSF)  
35CDi II Fanned Flue (RSF)  
47 311 31  
47 311 33  
47 311 35  
47 311 59  
USER INSTRUCTIONS &  
CUSTOMER CARE GUIDE  
 
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  
28CDi  
35CDi II  
9.0 - 24kW  
9.0 - 24kW  
10.5 - 27.5kW  
9.0 - 24kW  
9.0 - 28kW  
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.  
3
 
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  
28CDi  
9.0 ( 15%) litres/minute  
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.)  
Fig. 1. System Diagram.  
Automatic air  
vent  
Gas to water  
heat exchang-  
er  
Boiler  
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.  
Circulating  
pump  
Expansion  
vessel  
Water to  
water heat  
exchanger  
Pressure  
relief valve  
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.  
Diverter valve  
CH Domestic Domestic CH  
flow hot water cold sup- return charge  
out ply  
Safety dis-  
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 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  
Fig. 1a.  
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  
Grey  
Knob  
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  
10  
24CDi OF  
10  
24CDiBF  
10  
Left-hand side  
Right-hand side  
In Front  
10  
10  
10  
10  
10  
600  
180  
200  
600  
180  
200  
600  
300  
200  
600  
100  
200  
Above  
Below  
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.  
6
 
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  
1
2
wire mesh) concentrically spaced 13mm ( / in), 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.  
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 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.  
8
 
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  
DHW demand  
indicator  
Reset  
button  
Fig. 2. Controls.  
Central heating  
demand indicator  
Flame detection  
indicator  
Mains  
electricity  
indicator  
Operating CH temperature  
switch control knob  
DHW temperature  
control knob  
Sealed system pressure  
gauge  
9
 
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 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.  
Fig. 3. CDi with front panel removed.  
A facia mounted mechanical  
programmer will require resetting once  
the operating switch has been set to ‘O’,  
or the mains supply has been  
disconnected.  
Clip  
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.  
Expansion  
vessel  
Circulating  
pump  
OVERHEAT CUT-OFF  
Locating peg  
THERMOSTAT  
Gas valve  
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.  
10  
 
The appliance can be reset by pressing the reset button and  
holding in for 5 seconds.  
IGNITION LOCKOUT  
The appliance will enter a lockout condition in the event of the  
burner failing to ignite.  
If the burner fails to light within a preset time of 10 seconds the  
electricity supply to the gas valve will be interrupted.  
If ignition lockout has occurred, the central heating demand  
indicator will flash slowly (approximately once per second).  
The appliance can be reset by pressing the reset button and  
holding in for 5 seconds. Check that the gas supply has not been  
interrupted.  
If this condition continues to occur, then call a service engineer.  
AIR FLOW DEVICE (RSF ONLY)  
The appliance will enter a lockout condition in the event of an  
air flow fault.  
If the controls fail to detect the correct air flow through the  
appliance the electricity supply to the gas valve will be interrupted.  
If an air flow fault has occurred, the domestic water demand  
indicator will flash (approximately five times per second).  
The appliance will try to re-light after a waiting period of  
approximately 4 minutes Check that the flue terminal has not been  
obstructed or damaged. If this condition continues to occur, then call  
a service engineer.  
FLUE SPILLAGE DEVICE (OF ONLY)  
The appliance is fitted with a device which detects the spillage  
of combustion products from the draught diverter. In the event of the  
flue becoming wholly or partly blocked this device will cut the gas  
supply to the burner. If the device has activated, the D.H.W. demand  
indicator will flash (approximately 5 times per second).  
The device automatically resets after a waiting period of approxi-  
mately 20 minutes. If the blockage remains the appliance will re-light  
briefly before the device operates again. Should the problem persist  
consult your service engineer.  
REMOVAL AND REPLACEMENT  
OF THE FRONT PANEL (See Fig. 3)  
Removal:  
Holding the panel at the edges, slide it upwards to disengage the  
clips and ease the top edge forwards and upwards to raise it clear of  
the two pegs on the top edge of the facia.  
Replacement:  
Locate the two holes in the bottom edge of the front panel over  
the two pegs on the top edge of the facia and reverse the removal  
procedure.  
WARNING: Do not touch any component within the appliance  
when it is running as some may be very hot.  
 
11  
APPLIANCE FAILS TO  
OPERATE  
A diagnostic system is provided which gives a flashing light dis-  
play on the facia panel. Press the reset button to attempt to restart  
the appliance. If the appliance does not return to normal operation  
then contact your installer or Worcester Bosch.  
More than 30% of all calls made to our contact centre reporting  
appliance faults or breakdowns prove to be false alarms, as there is  
often a simple explanation for the apparent malfunction.  
So, to help you save time and money – not to mention frustration  
and inconvenience – please refer to the General Information, Notes and  
Lighting Instructions ensuring all controls are set correctly.  
If, after following the instructions the appliance still fails to oper-  
ate correctly call the Worcester Contact Centre on 08457 256206.  
Arrangements will be made for an engineer to call as soon as possible.  
CALL-OUT CHARGES  
All of our field service engineers are factory trained.  
If you request a visit from an engineer and your appliance has  
been installed within the last 12 months, no charge will be made for  
parts and/or labour, providing:  
The appliance was commissioned correctly on installation.  
An appliance fault is found and the appliance has been  
installed within the past 12 months.  
A call-out charge will be made where:  
The appliance has been installed for over 12 months, or  
Our Field Service Engineer finds no fault with the appliance  
(see note), or  
The cause of breakdown is with other parts of your plumb-  
ing/heating system, or with equipment not supplied by Worcester.  
NOTE: Invoices for attendance and/or repair work carried out on  
your appliance by any third party will not be accepted.  
12  
 
MAINTAINING YOUR  
APPLIANCE  
Your new Worcester CDi gas-fired appliance represents a  
long-term investment in a reliable, high quality product.  
In order to realise its maximum working life, and to ensure  
it continues to operate at peak efficiency and performance, it is  
essential that your boiler receives regular, competent servicing  
and annual maintenance checks beyond the initial 12 month  
guarantee period.  
Regular service contracts can be arranged with your  
installer – however if you have difficulty making a satisfactory  
arrangement simply contact Worcester on 01905 754624 for  
help.  
13  
 
SERVICE CENTRES  
CONTACT NUMBERS:  
UK Contact Centre Tel.  
UK Contact Centre Fax.  
08457 256 206  
01905 757536  
01506 441 687  
01 494 0099  
Scotland only  
Eire  
Fax.  
Tel:  
OPERATING HOURS:  
Mon - Fri  
Sat  
Sun  
7.00am to 8.00pm  
8.00am to 5.00pm  
9.00am to 12.00pm  
Please contact our UK Contact Centre number where our friendly oper-  
ators will book your call with one of our team of nationwide engineers.  
NOTE:  
Please refer to our website for our bank holiday opening hours.  
14  
 
YOUR WORCESTER  
CDi COMBI  
GUARANTEE  
This appliance is guaranteed from the date of installation  
subject to the following conditions & exceptions.  
1. The appliance is guaranteed for a  
period of 24 calendar months sub-  
ject to the return of the guarantee  
card within 30 days of installation  
and the first 12 months service and  
inspection having been carried out  
to the satisfaction of BBT  
Thermotechnology UK Ltd. Please  
note that this service is not covered  
under the terms & conditions of the  
warranty and would therefore incur  
a charge.  
that the appliance was correctly  
commissioned. This information  
must then be documented in the  
Benchmark Gas Boiler  
Commissioning Checklist.  
4. That any product or part thereof  
returned for servicing under the  
guarantee must be accompanied by  
a claim stating the model, serial  
number and date of installation.  
5. That BBT Thermotechnology UK Ltd  
will not accept responsibility for  
damage caused by faulty installa-  
tion, neglect, misuse, accidental  
damage or the non-observance of  
the instructions contained in the  
Installation and Users instructions  
leaflets.  
2. That during the period of this guar-  
antee any components of the unit  
which are Proved to be faulty or  
defective in manufacture will be  
exchanged or repaired Free of mate-  
rial charges and free of labour  
charges if repaired directly by BBT  
Thermotechnology UK Ltd.  
Invoices for attendance and repair  
of this appliance by third parties  
will not be accepted for payment by  
BBT.  
6. That the appliance has been used  
only for normal domestic purposes,  
for which it was designed.  
7. That this guarantee applies only to  
equipment purchased and used in  
mainland Great Britain.  
3. That the householder may be asked  
to prove the date of installation and  
This guarantee is given in addition to all your normal statutory rights.  
Worcester, Bosch Group is a trading name of BBT Thermotechnology UK Ltd.  
15  
 
GUARANTEE  
REGISTRATION  
You should complete and return the postpaid Guarantee  
Registration Card within 30 days of purchase.  
The card will register you as the owner of your new  
Worcester CDi appliance and, while this will not affect your  
statutory rights in any way, it will assist us to maintain an effec-  
tive and efficient customer service by establishing a reference  
and permanent record for your boiler.  
IMPORTANT: SERIAL NUMBER. Copy the number off the  
Guarantee Card.  
FOR YOUR OWN RECORD  
MODEL  
SERIAL NUMBER  
(See identity label inside appliance casing)  
TYPE/SIZE  
DATE OF INSTALLATION  
CORGI CONTACT  
All CORGI Registered installers carry a CORGI ID card and  
have a registration number. Both should be recorded in your  
central heating log book. You can check your installer is  
CORGI Registered by calling CORGI on 01256 372300  
Worcester, Bosch Group, Cotswold Way, Warndon, Worcester WR4 9SW.  
Telephone: 01905 754624 Fax: 01905 753130.  
Technical Helpline 08705 266241.  
Worcester, Bosch Group is a trading name of BBT Thermotechnology UK Limited  
8 716 114 647a (10/07)  
 

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