Worcester GREENSTAR Ri ErP Series User manual

UK/IE
User instructions
Wall hung RSF gas fired condensing regular boiler
GREENSTAR Ri ErP
6720813340-00.1Wo
For central heating systems
6 720 813 340 (2014/09)
If you smell gas:
▶ Well away from the building: call the National Gas Emergency
Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the gas
tank.
These appliances are for use with :
Natural Gas or L.P.G.
(Cat. II 2H 3P type C13, C33 & C53)
Model GC Number
Natural Gas 12Ri ErP 41-406-41
15Ri ErP 41-406-43
18Ri ErP 41-406-45
24Ri ErP 41-406-47
L.P.G. 12Ri ErP 41-406-42
15Ri ErP 41-406-44
18Ri ErP 41-406-46
24Ri ErP 41-406-48

2
Preface
Greenstar Ri ErP - 6 720 813 340 (2014/09)
Preface
Please read these instructions carefully
These instructions are applicable to the Worcester, Bosch
Group boiler model stated on the front cover only.
These instructions apply in the UK/IE only and must be followed
except for any statutory obligation.
After installation please leave this User instruction Manual,
Installation, Commissioning and Servicing Instructions and
completed Benchmark Checklist with the user.
Dedicated to heating comfort
Thank you for purchasing a Greenstar gas-fired condensing
combination appliance manufactured by Worcester, Bosch
Group. The company prides itself on manufacturing appliances
to the strictest quality control standards throughout every
stage of production.
Worcester, Bosch group has led the field in innovative
appliance design and performance for over 50 years. This
heritage means all our products are of exceptional quality and
proven reliability.
The Greenstar range in particular is extremely energy efficient,
offering you economical running costs and value for money. It is
amongst the top energy rated appliances available.
There is also the reassurance of our parts and labour guarantee
- backed up by Worcester Total Cover, an optional complete
maintenance scheme to keep your appliance operating at peak
condition and efficiency.

3
Contents
Greenstar Ri ErP - 6 720 813 340 (2014/09)
Contents
1 Key to symbols and safety instructions 4
1.1 Key to symbols 4
1.2 Safety precautions 4
2 General information 5
2.1 Energy efficiency 5
2.2 Servicing 5
2.3 Benchmark standard 5
2.4 User caution 5
3Controls6
3.1 Operating the boiler 7
3.1.1 Switching the boiler ON/Off 7
3.1.2 Setting the boiler flow temperature 7
3.1.3 Turning the central heating off during the
summer 8
3.1.4 Boiler frost protection 8
4 System pressure 9
4.1 Open vented heating systems 9
4.2 Sealed heating systems 9
4.3 External filling loop 10
5 Service Clearances 11
6 Maintaining your appliance 12
7FaultFinding13
7.1 Boiler reset 14
7.2 Extreme cold weather 15
8Faultorbreakdown16
9 Tips on energy saving 17
10 Environment / disposal 18
11 Your guarantee 18
12 Glossary 19

4
Key to symbols and safety instructions
Greenstar Ri ErP - 6 720 813 340 (2014/09)
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this
document:
•NOTICE indicates a situation that could resultin damage to
property or equipment.
•CAUTION indicates a situation that could result in minor to
medium injury.
•WARNING indicates a situation that could result in severe
injury or death.
•DANGER indicates a situation that will result in severe
injury or death.
Important information
Additional symbols
Examples of additional symbols used
A numbered step in an action sequence
A sequence of numbered steps or actions carried out in a
specific order to complete a task.
1. First action
2. Second action
3. Third action
etc.
A step in an action sequence
A sequence of defined actions or steps carried out in order to
complete a task.
▶Action
▶Nextaction
▶etc
A reference to a related part in the document or to other
related documents.
To refer the reader to a specific figure/table/section within the
manual.
e.g. figure 1.
A reference number to identify or refer to a part or item.
In a related figure, items or parts identified by a sequential
number.
List entries, first and second levels
• A single component/item
• A component/list, made up of multiple parts/items.
– Sub component or sublist of main component/list.
–etc.
1.2 Safety precautions
If you smell gas:
A gas leak could potentially cause an explosion. If you smell gas,
observe the following rules.
▶ Prevent flames or sparks:
– Do not smoke, use a lighter or strike matches.
– Do not operate any electrical switches or unplug any
equipment.
– Do not use the telephone or ring doorbells.
▶ Turn off the gas at the meter or regulator.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Well away from the building: call the National Gas
Emergency Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the
gas tank.
Appliance operation:
This appliance can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge, if they have
been given supervision or instruction concerning the use of the
appliance, in a safe way, and understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by children
without supervision.
Safety instructions in this document are
framed and identified by a
warning triangle which is printed on a grey
background.
This symbol indicates important information
where there is no risk to people or property.
Symbol Meaning
1. a numbered step in an action sequence
▶ a step in an action sequence
a reference to a related part in the document or to
other related documents
a reference number to identify or refer to a part or
item
•alistentry
– a list entry (second level)
Table 1
1

5
General information
Greenstar Ri ErP - 6 720 813 340 (2014/09)
Combustible and corrosive materials:
Chemically aggressive substances can corrode the appliance
and invalidate any guarantee.
• Do not store or use any combustible materials (paper,
thinners, paints, propellants, cleaning agents etc.) inside
the cupboard containing the appliance or within the vicinity
of the appliance.
Fittings and modifications:
Only a competent engineer can remove the appliance case and
carry out any work, in accordance with the Gas Safety
(Installation and Use) Regulations.
• Do not remove the appliance case.
Any misuse or unauthorised modifications to the appliance,
flue or associated accessories and heating system will
invalidate the guarantee.
• Do not modify the appliance or flue system in any way.
Worcester, Bosch Group accepts no liability arising from any
such actions. This does not affect your statutory rights.
Cleaning the appliance case:
Use a damp, soft cloth to clean the outer painted metal case of
the appliance, do not use chemicals or abrasive materials.
2 General information
2.1 Energy efficiency
Energy efficiency information is given in the Installation,
Commissioning and Servicing Instructions supplied with the
appliance.
2.2 Servicing
• The appliance must be serviced regularly by a competent,
qualified person, such as a Worcester service engineer or
other Gas Safe registered engineer.
• Always use original spares, to help maintain the efficiency,
safety and reliability of the appliance and have the Service
Record completed in the Benchmark Checklist.
The completed Benchmark Checklist will be required in the
event of any guarantee work and may be required by the local
Building Control Inspector.
2.3 Benchmark standard
The Benchmark initiative is a
code of practice to encourage
the correct installation,
commissioning and servicing of
domestic central heating
appliances and system
equipment.
A “checklist” is dispatched with every appliance and can be
found towards the back of the Installation, Commissioning and
Servicing Instructions. This is a vital document that needs to be
completed by the installer at the time of installation. It confirms
that the appliance has been installed and commissioned
according to the manufacturer's instructions.
The service record provides space for the recording of regular
servicing of the appliance/heating system and this can become
a valuable document when, for example, you wish to sell the
property. The service record will show a potential purchaser
that the heating system has received regular professional
maintenance and servicing during its lifetime.
The Benchmark initiative aims to:
• Raise standards among professional installers
• Build and maintain high safety standards in the industry
• Improve customer satisfaction levels
• Make a contribution to the nation's commitment to climate
change
2.4 User caution
• It isforbidden for any interference with the appliance other
than those actions allowed in this document.
Ensure that the service engineer completes
the Service Record in the Benchmark
Checklist after each service. The Benchmark
Checklist and service interval record can be
found at the rear of the Installation,
Commissioning and Servicing Instructions.
CAUTION: Incorrect use
▶ Any incorrect use can result in danger to
the householder.

6
Controls
Greenstar Ri ErP - 6 720 813 340 (2014/09)
3Controls
Fig. 1 Controls
1 Mains power ON/OFF knob 5 Maximum flow temperature position
2 Indicator/Diagnostic light “MAINS ON/OFF” (Blue) 6 Boiler reset position
3 Minimum flow temperature position 7 Burner ON indicator light (Green)
4 Flow temperature control knob
Table 2
6720813340-01.1Wo
14
32
76
5

7
Controls
Greenstar Ri ErP - 6 720 813 340 (2014/09)
3.1 Operating the boiler
3.1.1 Switching the boiler ON/Off
▶ Turn the “MAINS POWER” knob to 1 to switch ON the boiler.
▶ Turn the “MAINS POWER” knob to 0 to switch OFF the boiler.
Fig. 2 Switch ON/OFF boiler.
The boiler frost protection function will not work if the mains power knob is switch to OFF.
3.1.2 Setting the boiler flow temperature
1. Turn the central heating temperature control knob [1] to the desired level.
The temperatures range available is between approximately 35 to 82°C. This is not the room temperature but the flow
temperature through to the system (radiators and/or hot water cylinder).
2. When there is a demand for heat from the boiler, the burner indicator [2] will be illuminate to indicate that the boiler is firing.
Fig. 3 Central heating temperature control
6720813340-02.1Wo
1
ON
OFF
6720813340-03.1Wo
1
2
35ºC
82ºC

8
Controls
Greenstar Ri ErP - 6 720 813 340 (2014/09)
3.1.3 Turning the central heating off during the summer
▶ To turn your central heating off during warm periods:
▶ Set the programmer to OFF
– Please refer to the programmer manufacturer's instructions.
-or-
▶ Turn the room thermostat temperature down to minimum.
3.1.4 Boiler frost protection
If you are leaving your property unoccupied during cold weather, please leave your programmer on constant and your room
thermostat set to 15°C.
▶ If the temperature within the boiler falls below 8°C the pump will run to circulate water and prevent the system freezing.
– If the temperature does not rise to 9°C within 30 minutes of the pump operating, the boiler will fire up to provide heat to
bring the temperature up.
▶ If the temperature within the boiler falls below 5°C the boiler will fire, bringing the boiler temperature up to 12°C to avoid the
possibility of the system freezing.
▶ This process will be repeated until such time that the boiler temperature does not drop below 5°C.
Do not switch the boiler off at the mains power switch or mains fused spur.

9
System pressure
Greenstar Ri ErP - 6 720 813 340 (2014/09)
4Systempressure
4.1 Open vented heating systems
If the boiler is fitted to an open vented system, that is a system with a header tank, the pressure will be maintained automatically.
4.2 Sealed heating systems
If this boiler is fitted to a sealed heating system, the system will be pre-pressurised.
Your installer will have fitted a pressure gauge and filling loop so that the system can be monitored and adjusted as necessary.
Your installer will show you how to use the filling loop and advise you of the minimum and maximum pressure indicated on the
pressure gauge.
▶ Check regularly that the pressure is maintained.
Fig. 4 Optimum system pressure when your boiler is cold (area A)
▶ Contact your installer or maintenance engineer if a permanent significant decrease or increase in pressure is indicated on the
pressure gauge.
The filling method will be an external filling loop, fitted valves and flexible hose.
NOTICE: To comply with the Water Authority regulations you must disconnect the external filling loop after
re-pressurisation.
6720643356-11.1Wo
2
3
1
04
bar
1
A
Min
1 bar
1.5 bar
Max

10
System pressure
Greenstar Ri ErP - 6 720 813 340 (2014/09)
4.3 External filling loop
Once the external filling loop has been located, follow the instructions for re-pressurising the system.
1. Unscrew blanking cap.
2. Attach the hose to the valves, screw on hand-tight.
3. Turn the handle/screwdriver slot through 90° to open the valves.
4. The handle/screwdriver slot will be in-line with the valves
Fig. 5 External filling loop
5. When the pressure reaches between the 1 and 1.5 bar marks (zone A), turn the handle/screwdriver slot back, through 90°, to
close the valve.
6. The handle/screwdriver slot will be at 90° to the valves
7. Remove the hose and replace the blanking caps.
NOTICE: External filling loops
▶ If the filling loop does not look like the one shown in the figure below or you cannot find your filling loop, contact
your installer.
▶ To comply with Water Authority regulations you must disconnect the external filling loop after re-
pressurisation.
If the pressure gauge reads more than 1.5 bar as a result of over filling, bleed one radiator until the pressure gauge
returns to between 1 and 1.5 bar.
2
3
1
04
bar
1
A
Min
1 bar
1.5 bar
Max
6720806947-01.1Wo
1. 2.
7.
4. 4.
3.
3.
6. 6.
5.
5.