Bosch Worcester 15SBi, Worcester 24SBi User Instructions & Customer Care Manual
15/24SBi SYSTEM BOILER
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
IMPORTANT: THIS APPLIANCE IS FOR USE WITH NATURAL GAS OR 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 L. P. G.
15SBi 41 311 43 41 311 45
24SBi 41 311 44 41 311 46
SBi
Worcester supports the
Benchmark code of practice
Vote for your
‘Installer of the year’ at
www.worcester-bosch.co.uk
EXCELLENCE COMES
AS STANDARD
Thank you for purchasing a Worcester SBi gas-fired system
boiler.
The SBi Series 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
system 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.
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, 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 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 system 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 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-out request. It is important that
the checklist and/or declaration are fully completed by your installer.
GENERAL DESCRIPTION
(See Fig.1.)
The WORCESTER system boilers are sealed system central heating aplliances. They consist of a gas fired boiler having a varying output of between 6 - 15kW (15SBi) and 15 - 24kW (24SBi), a circulating
pump and all necessary controls to provide central heating.
They can be connected to a domestic hot water supply system
through an optional, internally fitted diverter valve or to an external
S or Y plan system.
Central Heating
3
4
Central Heating
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 mid-range 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 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.
Fig. 1. System Diagram.
Automatic air
vent
Gas to water
heat exchanger
Circulating
pump
Diverter valve
(optional)
CH
flow
Domestic
hot water
out
Domestic
cold sup-
ply
CH
return
Relief Valve
discharge
Pressure
relief valve
Boiler
Expansion
vessel
5
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. In this case your
installer will advise you on the minimum and maximum
pressure that should be indicated on the pressure gauge.
See Fig. 3. 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).
Pressurising The System (See Fig. 2).
(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 Byelaw
14 of the Water Byelaws Scheme.
Store the key in a safe place for future use and
refit the bottom panel
GENERAL NOTES
Grey
Knob
Filling Key
Fig. 2.
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