Bosch Worcester 9/14CBI User manual

Bosch Group
9/14, 14/19 & 19/24CBi
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
IMPORTANT: THIS APPLIANCE IS FOR USE WITH NATURAL GAS AND LPG
THESE INSTRUCTIONS APPLY IN THE UK ONLY.
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER OR AT THE GAS METER
G. C. NUMBERS
APPLIANCE NATURAL GAS LPG
9/14CBi 41 311 50 41 311 51
14/19CBi 41 311 52 41 311 53
19/24CBi 41 311 54 41 311 55

Thank you for purchasing a Worcester gas-fired boiler.
Worcester boilers are made by Worcester Heat Systems and
the strictest quality control standards are demanded throughout
every stage of production.
Indeed, Worcester Heat Systems have led the field in
innovative appliance design and performance for more than 30
years.
The result is that your
new Worcester boiler
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
no-nonsense 1 year parts
and labour guarantee.
And it’s backed up by
Worcester Care Call - a
complete maintenance scheme to keep your boiler operating at
peak condition and efficiency.
No wonder that more and more people are agreeing that
when it is gas, it has to be a Worcester boiler.
EXCELLENCE COMES
AS STANDARD
Page No.
Operating Instructions
.................................... 3-11
Fault and Breakdowns 12
Maintenance and
Extended Warranty
Information ............ 13-14
Guarantee Details ... 15-16
CONTENTS
2

GENERAL
INFORMATION
GAS SAFETY (INSTALLATION AND USE)
REGULATIONS 1998
It is the law 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
manufacturers notes must not be taken, in any way, as over-riding
statutory obligations.
WARNING: This appliance must be earthed and protected by a 5
amp fuse.
ELECTRICITY SUPPLY: 230V ~ 50Hz
IMPORTANT: To get the best from your Worcester boiler please
read these instructions carefully.
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 the new code of practice to
encourage the correct installation, commissioning and servicing of
domestic central heating boilers and system equipment.
The ‘log-book’ is a vital document that must be completed by the installer
at the time of installation and handed to the householder. It confirms that
the boiler has been installed and commissioned according to the
manufacturers instructions.
Without the completion of the log-book, manufacturers may refuse to
respond to a call-out from a householder, who will be advised that he or
she must call back the installer, who has not fulfilled his obligations to
record the information required by the initiative.
It is important that:
The services and the system are properly flushed as specified.
The user is clearly instructed on the correct operation of the appliance.
The benefits of regular servicing are explained – to maintain the efficiency
and extend the life of the appliance.
GENERAL DESCRIPTION
The Worcester boilers provide a heat output of between 9-14kW
(9/14CBi), 14-19kW (14/19CBi) & 19-24kW (19/24 CBi) and contain a
temperature control and all the appropriate safety controls. They are
suitable for fully pumped open vent or sealed systems.
They can be connected to a domestic hot water supply system
through an external S or Y plan system.
3

4
Central Heating
When a demand is made for heating by the system controls
(i.e. a programmer or room thermostat). A pump will energise
circulating primary water around the heating system and the burner,
after a few seconds, will light. The heat output from the appliance in
this mode has been factory set to give maximum output or as reset by
your installer. The appliance will operate as necessary to maintain the
temperature of the radiators at the level set by the adjustment of the
boiler Temperature Control Knob. (See Fig. 1.)
If the system no longer requires output to maintain the desired
room temperature, the burner will extinguish. The pump and fan 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.
Hot Water
A hot water cylinder will be maintained full of hot water under
the control of a cylinder thermostat.

5
Your installer will advise you of any actions you should take to
ensure that the satisfactory and efficient operation of the heating
and hot water systems connected to the boiler are maintained.
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. On a sealed system 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, a service engineer should be contacted and the system
corrected.
CLEARANCES
Compartment With Ventilation
Your installer will have provided adequate space around the
appliance for safety and servicing. This space must not be restricted
by the addition of cupboard shelves etc. closer to the appliance. The
following minimum clearances are required.
Compartment With No Ventilation
Your installer will have provided adequate space around the
appliance for safety and servicing. This space must not be restricted
by the addition of cupboard shelves etc. closer to the appliance.
Flammable objects must not be stored in this type of compartment.
The following minimum clearances are required.
* The clearance at the front is to be a removable panel e.g. a door. A clearance of 600mm
should be allowed with the door open.
GENERAL NOTES
9/14CBi 14/19CBi 19/24CBi
Left-hand side 5 5 5
Right-hand side 5 5 5
In Front 600 600 600
Above (Rear Only Flue) 30 30 30
Above (Flue Turret) 180 180 180
Below 200 200 200
9/14CBi 14/19CBi 19/24CBi
Left-hand side 105 105 105
Right-hand side 105 105 105
In Front* 340 340 340
Above (Rear Only Flue) 30 30 30
Above (Flue Turret) 180 180 180
Below 200 200 200

6
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.
PROGRAMMER/CLOCK
A programmer or clock may have been fitted to the system: the
method of setting varies with the type and manufacturer.
Refer to the instructions supplied with the control.
THERMOSTATIC RADIATOR VALVES
If thermostatic radiator valves are to be fitted to the system then
they must conform to the requirements of BS2767:10. It is advisable to
leave one valve permanently set at maximum to prevent the boiler
short cycling.
VENTILATION OF ROOM SEALED FANNED
FLUE (RSF) APPLIANCES
These appliances do not require air flow for combustion from the
room in which they are installed. Any cooling 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-combustible
partition as described in BS 6798:1987.
If the clearances are less than shown for an unvented compartment
then the compartment must be ventilated in accordance with BS5440.
FLUE TERMINAL
Do not allow the flue terminal fitted on the outside wall to
become obstructed or damaged.
CIRCULATING PUMP
The heating system will be filled with a circulating pump which
may be fitted with a speed adjuster. If so it will be set by the installer
to suit the heating load. Do not alter the setting.

7
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 Heat Systems Technical Helpline will advise you on
suitable frost precautions. The boiler has an in-built frost thermostat
which will protect the appliance should the temperature of the boiler
drop below approximately 10°C.
SERVICE
Annual servicing is important in order to ensure continuing
high efficiency and long life for your appliance. In the event of any
difficulty in making suitable servicing arrangements, Worcester Heat
Systems Limited or other competent persons will discuss regular
servicing arrangements and offer a comprehensive maintenance
contract.
WARNING
If a gas leak exists, or is suspected, turn off the gas supply to the
appliance at the service cock on the meter 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.

8
OPERATION OF
CONTROLS
BOILER HEATING TEMPERATURE
CONTROL
The position of this control will determine the temperature of
the water delivered from the appliance between the start of the dial as
indicated thus ' 'and the fully on position i.e. when the control is
turned fully clockwise. When the knob is turned fully anti-clockwise
to the ‘O’ position the appliance is off.
BOILER RESET BUTTON
If the lockout light is on or flashing, turn the temperature control
fully anticlockwise to the 'O' position and back on again. If the
appliance still fails to operate then contact Worcester Heat Systems or
your installer.

9
Fig. 1. Controls.
Boiler
demand
Temperature
control
Burner
on
Lock-out

10
INDICATOR LIGHTS
Boiler demand : System is calling for heat
Burner ON : Burner is firing
Lock-out : There is a fault condition
Steady light - Overheat
Flashing light - Flame failure
TO LIGHT THE APPLIANCE
Check that the water valves to the central heating circuit are open.
Check that the needle on the pressure gauge is not below the
required pressure - sealed system only.
Switch on the mains electricity. Set the room thermostat, if
fitted, to maximum. Turn the boiler temperature control fully
clockwise to the maximum position.The burner will light. Set the
boiler temperature control and the room thermostat/cylinder
thermostat, if fitted, to the desired temperature.
TO STOP THE APPLIANCE
For Short Periods
Turn the boiler temperature control fully anti-clockwise to the
‘O’ position.
For Long Periods
Turn the boiler temperature control switch to the ‘O’ position.
Switch off the mains electricity.
Any programmer will require resetting if 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.
Check that the settings of any programmer or time control
have been maintained.
TO LIGHT AND STOP THE
APPLIANCE