- Worcester, Bosch Group
0
I
25-28Si SERIES
APPLIANCE
25Si
28Si
G.C. NUMBERS
NATURAL GAS
47 311 49
47 311 51
L.P.G.
47 311 50
47 311 52
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
EXCELLENCE COMES
AS STANDARD
Thank you for purchasing a Worcester Si Series gas-fired
combination appliance.
Worcester Si Series appliances 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 Si
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 Worcester Si Series.
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 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 3
amp fuse.
ELECTRICITY SUPPLY: 230V ~ 50Hz
IMPORTANT: To get the best from your Worcester Si appliance
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 'log book' is dispatched with every appliance, 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.
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 that your installer is CORGI registered
by calling CORGI on 01256 372300.
Without the completion of the log book, manufacturers may
refuse to respond to a call-out request. It is important that your
installer has given you the fully completed log book.
GENERAL DESCRIPTION
(See Fig.1.)
The WORCESTER Si MODELS are combined domestic hot water
and central heating appliances. They consist of a gas fired boiler
having a varying output of between 8.5kW and 25kW (25Si) or 28kW
(28Si), and all the necessary controls to provide mains fed domestic
hot water and central heating.
The appliances are fitted with a manual Operating Switch.
The appliances can operate in one of two modes. Hot water only
or hot water and central heating.
3
Hot Water Mode:
When a demand is made for hot water by opening a tap or
shower; the flow switch will energise the boiler. The burner will light
at its maximum setting and hot water will be delivered to the tap or
shower.
When hot water is no longer required the appliance pump or fan
may continue to operate to dissipate the excess heat within the boiler.
Fig. 1. System Diagram.
Automatic air
vent
Primary heat
exchanger
Expansion
vessel
Fixed
by-pass
Circulating
pump
Domestic
water flow
switch
Relief valve
CH Domestic Domestic CH
Relief valve
flow hot water
cold return discharge
supply
supply
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, a service engineer should be contacted and
the system corrected.
SEALED HEATING SYSTEM
The appliance must be fitted to a sealed heating system which is
pre-pressurised. Your installer will advise you on the minimum and
maximum pressure 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 indicated 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).
5
CLEARANCES
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.
Left-hand side
Right-hand side
In Front
Above the casing
Below
RSF
10
10
600
180
200
Minimum clearances in millimetres.
NOTE: If the appliance is to be enclosed after the
installation then the instructions given in Section 6, Air
Supply, of the Installation Book MUST be followed.
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 to be fitted to the system then
they must conform to the requirements of BS2767:1972. It is advisable
to leave one valve permanently set at maximum to prevent the boiler
short cycling.
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 Worcester Heat Systems
Technical Helpline.
HOT AND COLD FLOW
If 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.
6
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
requirements of the local Water Company. An isolating valve to
facilitate 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 Heat
Systems Technical Helpline.
VENTILATION OF 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-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 Heat Systems Technical Helpline will advise you on
suitable frost precautions. For short periods the built-in frost
protection of the appliance will be adequate.
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 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
The appliance is fitted with the following controls:
OPERATING SWITCH
In the ‘0’ position there is no mains electricity to the control
board.
In the ‘I’ position mains electricity is connected to the control
board.
CENTRAL HEATING TEMPERATURE
CONTROL
▲
The position of this knob will determine the temperature of the
water delivered to the radiators between fully clockwise and anticlockwise to the
mark. 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 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 fully
clockwise and anti- clockwise positions.
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 and to remove heavy grease deposits on plates, etc. 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 grey needle will show the actual pressure in the system.
When operating the pressure indicated must not be greater than
2.5bar. If it is then contact your installer.
8
IGNITION LOCKOUT
The appliance will enter a lockout condition in the event of the
burner failing to ignite.
If the burner fails to light after 5 attempts 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
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, and that the fan and air pressure switch are in
good order.
If this condition continues to occur, then call a service engineer.
11
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 ‘O’ position.
For Long Periods
Turn the operating switch to the ‘O’ position. Switch off the
mains electricity.
A facia mounted electronic programmer
will retain its settings for about two
Fig. 3. Si with front casing removed.
Fixing screws
weeks, after which it will return to the
(4)
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.
Inner
case
cover
Flow
switch
Gas valve
Pump
Air
pressure
switch
Facia
10
Facia panel
fixing screws
(2)
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.
The appliance can be reset by pressing the reset button and
holding in for 5 seconds when the appliance has cooled.
IGNITION LOCKOUT
The appliance will enter a lockout condition in the event of the
burner failing to ignite.
If the burner fails to light after 5 attempts 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
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, and that the fan and air pressure switch are in
good order.
If this condition continues to occur, then call a service engineer.
11
APPLIANCE FAILS TO
OPERATE
More than 30% of all calls made to Worcester Heat Systems to
report 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 operate
correctly call the Worcester Heat Systems Service Centre. 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
plumbing/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 Si gas-fired appliance represents a longterm 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 Heat Systems on
0345 256206 for help.
If you would like to know more about Worcester’s extended
warranty options please tick the appropriate box on your
warranty registration card.
13
SERVICE CENTRES
CONTACT NUMBERS:
UK Call Centre
UK Call Centre
Scotland only
Tel.
Fax.
Fax.
08457 256 206
01905 757536
01506 441 687
OPERATING HOURS:
Mon - Fri
Sat
8.00am to 6.00pm
8.30am to 1.00pm
Please contact our UK Call Centre number where our friendly operators
will book your call with one of our team of nationwide engineers.
NOTE:
Sunday and Bank Holiday cover is not available
14
YOUR WORCESTER
Si SERIES
GUARANTEE
This appliance is guaranteed against faulty materials or
workmanship for a period of twelve calendar months from the
date of installation subject to the following conditions and
exceptions.
1. That during the currency of this
guarantee any components of the
unit which are proved to be faulty
or defective in manufacture will be
exchanged or repaired free of
material charges and free of labour
charges by Worcester Heat Systems
Limited.
2. That the householder may be asked
to prove the date of installation,
that the appliance was correctly
commissioned and, where
appropriate, the first 12 month
service has been carried out to the
satisfaction of Worcester Heat
Systems Limited when requested.
3. That any product or part thereof
returned for servicing under the
guarantee must be accompanied by
a claim stating the Model, Serial
Number, Date of Installation.
4. That Worcester Heat Systems
Limited will not accept
responsibility for damage caused by
faulty installation, neglect, misuse
or accidental damage, the nonobservance of the instructions
contained in the installation and
Operating Instructions Leaflets.
5. That the appliance has been used
only for normal domestic purposes
for which it was designed.
6. That this guarantee applies only to
equipment purchased and used in
mainland Great Britain.
This guarantee is given in addition to all your normal statutory rights.
15
GUARANTEE
REGISTRATION
You should complete and return the postpaid Guarantee
Registration Card within 14 days of purchase.
The card will register you as the owner of your new
Worcester Si appliance and, while this will not affect your
statutory rights in any way, it will assist us to maintain an
effective 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
TYPE/SIZE
DATE OF INSTALLATION
Do not forget to keep the
in a safe place.
Log book
EXCELLENCE COMES AS STANDARD
Worcester Heat Systems Limited. Cotswold Way, Warndon, Worcester WR4 9SW.
Telephone: (01905) 754624 Fax: (01905) 754619.
Technical Helpline (0990) 266241.
8 716 145 198 b 11/00
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