Boschhome 18 Dec Users Manual

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2015-01-21

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GREENSTAR HEATSLAVE EXTERNAL
12/18, 18/25, 25/32kW
FLOOR STANDING EXTERNAL OIL FIRED CONDENSING COMBINATION
BOILER USING BALANCED FLUE SYSTEM
FOR OPEN VENT AND SEALED CENTRAL HEATING SYSTEMS WITH DOMESTIC MAINS FED HOT WATER

THE APPLIANCE IS FOR USE WITH KEROSENE ( 28 SECOND
OIL) ONLY

INSTRUCTION MANUAL
INSTALLATION COMMISSIONING
& SERVICING

INSTALLATION & SERVICING INSTRUCTIONS
SYMBOLS USED IN THIS MANUAL:

PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION.
THESE INSTRUCTIONS ARE APPLICABLE TO THE WORCESTER APPLIANCE MODEL(S)
STATED ON THE FRONT COVER OF THIS MANUAL ONLY AND MUST NOT BE USED WITH
ANY OTHER MAKE OR MODEL OF APPLIANCE.

Domestic hot water

THE INSTRUCTIONS APPLY IN THE UK ONLY AND MUST BE FOLLOWED EXCEPT FOR ANY
STATUTORY OBLIGATION.

Central heating

THIS APPLIANCE MUST BE INSTALLED BY A COMPETENT PERSON. FAILURE TO INSTALL
CORRECTLY COULD LEAD TO PROSECUTION.
COMPLYING WITH THE BUILDING REGULATIONS:
This heating appliance forms part of the controlled services for the building. It is law that all controlled
services for buildings must comply with building regulations. You must be able to satisfy your Local
Authority Building Control Body (LABC) that the work carried out concerning the installation and
commissioning of this heating appliance has been carried out to a satisfactory standard.

Room thermostat

Frost thermostat

OFTEC operate a competent persons scheme and registered installers are able to certify that their
work complies with building regulations. Under the scheme;
OFTEC must be informed about every installation.
OFTEC will issue a building regulations compliance certificate to the householder and will
notify the LABC.

Wait time period

OFTEC provide controlled document forms CD10 and CD11 for use during installation and
commissioning respectively.
Programmer/timer OFF

Other organisations operate self-certification schemes e.g. NAPIT and BESCA Ltd. and it may be
possible for installers who are members of these organisations to self certify their work.
Alternatively you must submit a building control notice to the LABC before installing any boiler. The
LABC will then arrange regular inspection visits during the work to ensure that the installation
complies with the regulations.

Programmer ON CH only

IF YOU ARE IN ANY DOUBT CONTACT THE WORCESTER TECHNICAL HELPLINE.
DISTANCE LEARNING AND TRAINING COURSES ARE AVAILABLE FROM WORCESTER.
Programmer ON DHW only

PLEASE LEAVE THESE INSTRUCTIONS WITH THE COMPLETED COMMISSIONING FORM
AND THE USER MANUAL WITH THE OWNER OR WITH THE APPLIANCE AFTER
INSTALLATION OR SERVICING. THE SERVICE INTERVAL RECORD CAN BE FOUND ON
THE BACK PAGE OF THIS MANUAL.

Programmer ON CH and DHW

Cold water main supply

Electricity supply

IMPORTANT HANDLING INSTRUCTIONS:
It is advised that more than one person is involved
in the transfer of the packaged appliance from the
van to the point of installation.
It is advised that no attempt should be made to
move the packaged appliance without the use of
a suitable truck.
At all times the correct method for handling
heavy objects should be strictly observed.
GENERAL HANDLING GUIDELINES:
• Lift only a manageable weight, or ask for
help.
• When lifting, bend the knees, and keep the
back straight and feet apart.
• Do not lift and twist at the same time.
• Lift and carry items close to the body.
• Wear protective clothing and gloves to
protect from any sharp edges.

ABBREVIATIONS USED IN THIS MANUAL:
Ø
Diameter
CH
Central Heating
DHW
Domestic Hot Water
TRV
Thermostatic Radiator Valve
IP
Ingress Protection
CF
Conventional flue
BF
Balanced flue
N/A
Not allowed
SEDBUK
Seasonal Efficiency of Domestic Boilers in the United Kingdom
OFTEC
Oil Firing Technical Association for the Petrolium Industry
IEE
Institute of Electrical Engineers
LABC
Local Authority Building Control Body
STORE THE APPLIANCE IN A DRY AREA PRIOR TO INSTALLATION.

Check List

Hardware/Literature pack

Item
Qty
Greenstar Heatslave External Installation/Servicing Instructions.........1
Users Instructions............................................................................................1
Hardware Pack.................................................................................................1
100mm Ø Services Duct................................................................................1
Condensate Trap Kit........................................................................................1
Warranty Return Envelope.............................................................................1
Cabinet Key.......................................................................................................1

1
INSTALLATION &
SERVICING INSTRUCTIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

SAFETY &
REGULATIONS

CONTENTS

IMPORTANT INFORMATION AND SYMBOLS

SAFETY PRECAUTIONS AND INSTALLATION REGULATIONS

APPLIANCE
INFORMATION

SAFETY & REGULATIONS

APPLIANCE INFORMATION
GENERAL INFORMATION

TECHNICAL DATA

LAYOUT & COMPONENTS

CLEANING PRIMARY SYSTEMS

MAINS SUPPLIES

8
9

WATER SYSTEMS & PIPEWORK

10-11

CONDENSATE & PRESSURE RELIEF PIPEWORK

BOILER LOCATION & CLEARANCES

CABINET MOUNTED LOW LEVEL FLUE TERMINAL POSITIONS

HIGH LEVEL FLUE TERMINAL POSITIONS

EXTERNAL OILFIT BALANCED FLUE OPTIONS

CABINET MOUNTED HORIZONTAL BALANCED FLUE OPTIONS

INSTALLATION

OIL SUPPLY

PRE INSTALLATION

PRE-INSTALLATION

INSTALLATION
18

PIPEWORK & FLUE POSITIONS

BOILER INSTALLATION

FLUE INSTALLATION

COMBUSTION CHAMBER

PIPEWORK CONNECTIONS

23-24

OIL BURNER AND PUMP

REFITTING COMPONENTS

ELECTRICS

COMMISSIONING

UNPACKING THE BOILER

27-28

PRE-COMMISSIONING CHECKS - APPLIANCE

FILLING THE SYSTEM

30
31-34

WATER TREATMENT

FINISHING COMMISSIONING - APPLIANCE

36
FAULT FINDING
& DIAGRAMS

STARTING THE APPLIANCE

SERVICING
& SPARES

COMMISSIONING

SERVICING & SPARES
INSPECTION AND SERVICE

37-40

SHORT PARTS LIST 12/18

SHORT PARTS LIST 18/25

SHORT PARTS LIST 25/32

FAULT FINDING & DIAGNOSIS
FAULT FINDING

44-45

FAULT FINDING LOGIC FOR SATRONIC CONTROL BOX

FAULT FINDING LOGIC FOR 535 SE/LD RDB CONTROL BOX

ELECTRICAL SCHEMATIC

COMMISSIONING & SERVICE RECORDS
COMBUSTION RECORD

SERVICE INTERVAL RECORD

2
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

CONTENTS

SAFETY &
REGULATIONS

SAFETY PRECAUTIONS

INSTALLATION REGULATIONS

OIL SMELLS, LEAKS OR FUMES FROM THE APPLIANCE:
Extinguish any naked flames.
Isolate the electrical supply.
Isolate the fuel supply to the boiler.
Rectify fault.

HEALTH & SAFETY:
The appliance contains no asbestos and no substances have been used in the construction
process that contravene the COSHH Regulations (Control of Substances Hazardous to Health
Regulations 1988). Where applicable, the CE mark indicates compliance with relative EU
Directives.
COMBUSTIBLE AND CORROSIVE MATERIALS:
Do not store or use any combustible materials (paper, thinners, paints etc.) inside or within the
vicinity of the appliance.
The combustion air must be kept clear of chemically aggressive substances which can corrode
the appliance and invalidate any warranty.
FITTING & MODIFICATIONS:
Fitting the appliance and any controls to the appliance may only be carried out by a competent
engineer in accordance with these instructions and the relevant Installation Regulations.
Flue systems must not be modified in any way other than as described in the fitting instructions.
Any misuse or unauthorised modifications to the appliance, flue or associated components and
systems could invalidate the warranty. The manufacturer accepts no liability arising from any
such actions, excluding statutory rights.
SERVICING:
Advise the user to have the system regularly serviced by a competent, qualified engineer (such
as OFTEC registered personnel) using approved spares, to help maintain the economy, safety
and reliability of the appliance.

Failure to install appliances correctly could lead to
prosecution.
The appliance should be installed by a competent
person. The person installing the appliance should
be aware of the Health and Safety at Work Act and
take appropriate action to ensure that the
regulations are adhered to. In order to give
optimum efficiency and trouble free operation the
appliance must be commissioned by a qualified
OFTEC engineer.
The compliance with a British Standard does not,
in itself, confer immunity from legal obligations. In
particular the installation of this appliance must be
in accordance with the relevant requirements of the
following British Standards and regulations in
respect of the safe installation of equipment:
BS 5410: part 1: Code of practice for Oil Fired
Boilers.
BS 799: part 5: Specification for Oil Storage
Tanks.
BS 7593: Code of Practice for treatment of water
in domestic hot water central heating systems.
BS 5449: part 1: Specification for forced
circulation hot water central heating for domestic
premises.
BS 5955: part 8: Specification for the installation
of thermoplastic pipes and associated fittings for
use in domestic hot and cold water services and
heating systems.
BS 7291: Thermoplastic pipes and associated
fittings for hot and cold water for domestic
purposes and heating installations in buildings.
BS 7074: part 1: Application, selection and
installation of expansion vessels and ancillary
equipment for sealed water systems.
BS 7671: IEE Wiring Regulations, current edition.
BS 1362: Specification for general purpose fuse
links for domestic and similar purposes.
The Building Regulations Part J and L1 England
and Wales; Part F and Part J Section III Scotland;
Part L and Part F Northern Ireland.
Local water company bye-laws.
The Control of Pollution (Oil) Regulations.
OFTEC Standards.
Where no specific instruction is given, reference
should be made to the relevant codes of practice.

3
SAFETY PRECAUTIONS
& INSTALLATION REGULATIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

GENERAL INFORMATION
STANDARD PACKAGE:

770mm

640mm

A - Floor standing oil fired condensing boiler for
open vent and sealed domestic central heating
and mains fed hot water.
B - Literature pack.

D - 100mmØ services duct.
E - Cabinet key

950mm

APPLIANCE
INFORMATION

C - Condensate trap kit.

Check List
Item
Qty
Greenstar Heatslave External Installation/Servicing Instructions........1
Users Instructions ..........................................................................................1
100mm Ø Services Duct...............................................................................1
Condensate Trap Kit.......................................................................................1
Warranty Return Envelope ............................................................................1
Cabinet Key.......................................................................................................1

4
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

GENERAL INFORMATION

TECHNICAL DATA
DESCRIPTION

UNITS

12/18

18/25

25/32

Central Heating

APPLIANCE
INFORMATION

Primary water capacity (total)

litres

Maximum static head

metres

Minimum static head

metres

metres water

4.7

4.0

4.2

bar

2.5

colour

Lime

—

litres/min

Minimum inlet pressure (dynamic) for optimum flow rate

bar

1.5

1.2

0.9

Maximum hot water rise for 90 litres draw off (@optimum flow rate)

°C

kg/hr

Available pump head (20°C difference) at max. output
Max. permissible sealed system operating pressure
in accordance with WRAS guidelines
Flow restrictor
Domestic Hot Water
Optimum flow rate (±15%)

Flue
Exit flue gas mass flow
Pipework connections
Fuel line (compression)

CH flow

CH return

Water main inlet

DHW outlet

Open vent (optional)

BSP

CH drain/optional feed and expansion

BSP

Condensate (polypropylene)

21.5

AC...V

230

Frequency

Max. power consumption

240

263

CH control thermostat range (cut in/cut out)

°C

55/81

DHW control thermostat range (cut in/cut out)

°C

55/72

CH & DHW control thermostat differential

°C

Boiler high limit thermostat set point

°C

Boiler manual reset overheat thermostat set point

°C

105

Flue reset overheat thermostat set point

°C

110

°C

<100

SEDBUK (Band A)

90.2

90.1

90.3

Appliance protection rating

Weight (excluding packaging)

195

206

class

mg/kW hr

Electrical
Electrical power supply voltage

Thermostats

General Data
Maximum hearth temperature

Emissions class for NOx and CO
Typical NOx emissions figure

5
TECHNICAL DATA

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

LAYOUT & COMPONENTS
The diagram opposite excludes the top, front
and RH side casing panels.

44
43
i)

iii)

ii)

43
i)
42b

ii)
iii)
iv)

13
v)
42a

18
14

12
10

8 9
4

7
19

39
38
37
35/36
34
33
32

20
21

31
30
26
29

27
28

CONTROL BOX ASSEMBLY
DIVERTER VALVE
PRESSURE GAUGE
AUTO AIR VENT
CH CONTROL AND MANUAL RESET
OVERHEAT THERMOSTAT PHIAL
6. CASING SIDE PANEL
7. CIRCULATING PUMP
8. AUTO-RESET HIGH LIMIT
THERMOSTAT PHIAL
9. DHW FLOW SWITCH
10. PRESSURE RELIEF VALVE
11. DHW HEAT EXCHANGER
12. FLUE GAS SAMPLING POINT
13. FLUE OVERHEAT THERMOSTAT
PHIAL
14. CASING SUPPORT PANEL
15. FLUE MANIFOLD ACCESS COVER
16. AIR INLET PIPE AND CASING
17. SECONDARY HEAT EXCHANGER
BLEED POINT (ONE ON EITHER SIDE)
18. SECONDARY HEAT EXCHANGER
19. SECONDARY HEAT EXCHANGER
DRAIN
20. EXPANSION VESSEL
21. OPTIONAL OPEN VENT/AIR VENT
22. DRAIN AND OPTIONAL FEED AND
EXPANSION
23. CONDENSATE OUTLET
24. PRIMARY HEAT EXCHANGER
25. TRAY
26. OIL ISOLATION VALVE
27. CONDENSATE TRAP
28. CONDENSATE TRAP BRACKET
29. COMBUSTION CHAMBER ACCESS
DOOR
30. HEATSLAVE TANK DRAIN
31. HEATSLAVE TANK
32. MODE SWITCH
33. BOILER MODE INDICATOR
34. LOCKOUT INDICATOR
35. OVERHEAT RESET BUTTONS (boiler &
flue temperature)
36. LOCKOUT RESET BUTTON
37. SERVICE CONNECTION
38. CH TEMPERATURE CONTROL
39. DHW TEMPERATURE CONTROL
40. DATA LABEL
41. FROST THERMOSTAT SENSORS
42a. B E NTO N E STE R LI N G B U R N E R
(12/18 & 18/25)
i) CONTROL BOX
ii) MOTOR
iii) AIR INTAKE CASING
iv) OIL PUMP
v) COMBUSTION HEAD

APPLIANCE
INFORMATION

iv)

1.
2.
3.
4.
5.

42b. RIELLO RDB 2.2 BURNER (25/32)
i) CONTROL BOX
ii) MOTOR
iii) AIR INTAKE CASING
iv) OIL PUMP
v) COMBUSTION HEAD
43. CLIP - AIR INTAKE HOSE
44. AIR INTAKE HOSE

6
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

LAYOUT & COMPONENTS

CLEANING PRIMARY SYSTEMS
IMPORTANT: All the following Pre-Installation sections must be read and
requirements met before starting boiler or flue installation.

CAUTION: ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND
OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.

IMPORTANT: Debris from the system can
damage the boiler and reduce efficiency.
Failure to comply with the guidelines for
t he use of wat er treatment with the
appliance will invalidate the appliance
warranty.
BEFORE CLEANING THE SYSTEM:
ENSURE THE SYSTEM AND PIPEWORK IS
IN GOOD WORKING ORDER.

PRE INSTALLATION

FLUSH THE EXISTING SYSTEM WITH A
POWER FLUSHING MACHINE OR WITH A
CHEMICAL CLEANER BEFORE
INSTALLING NEW COMPONENTS.
CLEANING THE PRIMARY SYSTEM:
Cleanse the system in accodance with
BS 7593.
Fill the system with cold mains water to the
recommended pressure and check for leaks.
Open all drain cocks and drain the system.
Close drain cocks and add a suitable flushing
agent at the correct strength for the system
condition in accordance with the manufacturer's
instructions.
Circulate the flushing agent before the boiler
is fired up.
Run the boiler and system at normal operating
temperature in accordance with the
manufacturer's instructions.
Drain and thoroughly flush the system to
remove the flushing agent and any debris.

7
CLEANING PRIMARY SYSTEMS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

IMPORTANT: The appliance provides a permanent external electrical supply
for servicing and must therefore be fed via a circuit breaker incorporating
earth leakage protection.

MAINS SUPPLIES

ELECTRIC SUPPLY:
• Supply: 230V - 50Hz.
• Cable: PVC insulated 0.75mm2 (24 x
0.2mm) temperature rated to 90°C.
• Protection IP45.
• External 5A fuse to BS 1362.
• The appliance must be earthed.
• Please refer to IEE regulations for cross
bonding requirements.

• Wiring between the appliance and the
electrical supply must comply with IEE wiring
regulations and any local regulations which
may apply for fixed wiring to a stationary
appliance.
• Any system connected to the boiler must not
have a separate electrical supply.

PRE INSTALLATION

• It must be possible to isolate the appliance
from the electric supply with at least a 3mm
contact separation in both poles supplying
the appliance.

WATER SUPPLY:
The following are general requirements and if
necessary the advice of the local water company
should be sought before fitting the appliance.
• The appliance cold water supply should be
the first connection off the water main where
possible.
Water Mains Pressure:
Minimum dynamic mains water pressure for
optimum performance.

MAINS WATER EXPANSION VESSEL:
A - Mini expansion vessel, part No. 7 716 102 105
B - Mains water inlet
C - Non-return valve
D - Boiler
D
A

12/18kW

18/25kW

25/32kW

1.5 bar

1.2 bar

0.9 bar

• Maximum mains fed water pressure 10 bar.
If necessary, fit a pressure reducing valve.
IMPORTANT: Non-return, back flow
prevention devices (including those
associated with water meters) fitted to the
mains water supply can cause a pressure
build up which could damage the boiler
and other household appliances.

C
• Where the water main supply has a nonreturn, back flow prevention valve fitted, a
mini expansion vessel (A) must be connected
to the mains water inlet pipe (B) between the
non-return valve (C) and the boiler (D) as
shown opposite.
Use in hard water areas:
Normally there is no need for water treatment to
prevent scale formation as the maximum
temperature of the heat exchanger is limited by
the control circuit.
In areas where the temporary water hardness
exceeds 200ppm, consideration may need to
be given to the fitting of a scale prevention
device. In such circumstances, the advice of
the local water authority should be sought.

8
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

MAINS SUPPLIES

A
B
C
D
E
F
G

H
J
K
L
M
N

- Oil storage tank
- Isolating valve
- Oil strainer & water seperator
- Fire valve to BS5410
- External casing
- Fire valve sensor
- Oil burner

OIL SUPPLY

- Oil supply pipe
- Oil pump
- Full base (plastic tanks)
- Non-return valve
- De-aerator
- Oil filter (16µm max filtration size)

This appliance is suitable for kerosene (28
second oil) only, no other fuel must be used.
OIL SUPPLY:
• Plastic or steel tanks should be installed to
BS 5410. A steel tank should conform to
BS 799: part 5 and have a slope of 1 in 24
away from the outlet valve with a sludge cock
at its lower end.
• Do not use galvanised steel tanks or
pipework for the oil supply system.
• Do not use soldered joints on the oil
supply pipework.

NOTE: All dimensions are in metres unless stated otherwise.
The maximum pipe run figures are based on using copper pipe with an inside diameter of
2mm less than the Ø.
.
1m min

B C

BN G

MAXIMUM PIPE RUN FOR SINGLE PIPE GRAVITY FEED SYSTEM
HEAD
0.5
1.0
1.5
2.0

10mmØ
12
25
37
49

12mmØ
30
69
91
100

HEAD
2.5
3.0
3.5
4.0

10mmØ
62
74
87
99

c) Single pipe suction lift with de-aerator
Maximum suction height 3.5 metres. The oil
tank (A) must be positioned below the oil pump
(J). Create an inlet and return loop between the
de-aerator (M) and oil pump (J).

1m min

F G

A
B C

150mm
K

MAXIMUM PIPE RUN FOR DOUBLE PIPE SUB-GRAVITY FEED SYSTEM
10mmØ
50
44
38
32

12mmØ
100
100
95
80

HEAD
2.0
2.5
3.0
3.5

10mmØ
26
20
14
8

c)
A
H

1m min

. E

MAXIMUM PIPE RUN FOR SINGLE PIPE SUCTION LIFT WITH DE-AERATOR
HEAD
0
0.5
1.0
1.5

FUEL FLOW RATE
2.5kg/h 5kg/h 10kg/h 10kg/h
8mmØ 8mmØ 8mmØ 10mmØ
100
55
26
100
95
45
23
100
80
40
20
90
70
35
17
75

HEAD
2.0
2.5
3.0
3.5

A top feed oil tank fitted with a de-aerator
using an internal non-return valve should have
any non-return valves fitted in the base of the
tank to the suction line removed to assist
purging air from the oil line.

Lay the oil supply pipe (H) as straight and
level as possible to avoid air pockets and
unnecessary friction losses. Route away
from the boiler access door or other hot
surfaces.

F
G

B C

A non-return valve must be incorporated within
the de-aerator or fitted to the oil line between
the oil storage tank (A) and the de-aerator (M).

Pipework
Use copper pipe of the correct diameter
according to the information shown opposite.
Use flexible hoses to connect to the oil pump (J).

12mmØ
66
50
37
22

3.5m (11.5ft) max.

HEAD
0
0.5
1.0
1.5

a) Single pipe gravity feed system:
The oil storage tank (A) must be positioned so
that the oil level does not exceed 4 metres above
the level of the burner oil pump (J) and in addition the oil level must be at least 300mm above
the oil pump (J). Where the maximum oil level in
the oil storage tank exceeds 4 metres, a head
breaking device must be installed between the
tank (A) and the burner oil pump (J).
b) Double pipe sub-gravity feed system:
Maximum suction height 3.5 metres. Non-return
valves must be fitted to the inlet and return oil
line between the oil pump (J) and oil storage
tank (A).

12mmØ
100
100
100
100

3.5m (11.5ft) max.

PRE INSTALLATION

4m (13ft) max.

300mm
min.

FUEL FLOW RATE
2.5kg/h 5kg/h 10kg/h 10kg/h
8mmØ 8mmØ 8mmØ 10mmØ
60
30
14
65
45
25
11
50
35
15
8
35
25
10
5
20

The table and illustration above is a guide only and does not in any way override the deaerator manufacturers instructions.

Install a manual isolating valve (B) to the oil
supply pipe (H), as close to the oil storage
tank (A) as possible.
Fit an oil strainer and water seperator (C) to
the oil supply pipe, near the oil storage tank.
Fit an additional oil filter (N, 16µm max
filtration size) close to the boiler, but not
inside the boiler casing.
Fit a fire valve in accordance with BS 5410.
The fire valve (D) must be fitted externally
at least 1 metre from the appliance with the
fire valve sensor (F) located within the
appliance case.
A capillary type valve provides a neat and
simple installation. Alternatively, a fusible
link or electrical system may be used.
Under no circumstances should a
combination isolating/fire valve be used
as the sole fire protection device.

9
OIL SUPPLY

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

WATER SYSTEMS & PIPEWORK
IMPORTANT: The boiler should not be
allowed t o operat e wit h a ret urn
temperature of less than 40°C when the
system is up to operating temperature.
PRIMARY SYSTEM PLASTIC PIPEWORK:

• Plastic pipework used for underfloor heating
must be correctly controlled with a
thermostatic blending valve limiting the
temperature of the circuits to approx. 50°C
with 1000mm (minimum) length of copper or
steel pipe connected to the boiler.

TYPICAL OPEN VENT SYSTEM

1000mm min.
F

INSTALLATION

PRIMARY SYSTEM/CONNECTIONS/VALVES:

• Do not use galvanised pipes or radiators.

R
T

R
L

• Radiator valves should conform to
BS 2767:10.

• All other valves should conform to BS 1010.
G

R
L

COMMISSIONING

• All system connections, taps and mixing
valves must be capable of sustaining a
pressure of 3 bar.

PRE INSTALLATION

• Plastic pipework must not be used for
the DHW system.
• Any plastic pipework used for the CH system
must have a polymeric barrier, comply with
BS 7921 and installed to BS 5955 with
1000mm (minimum) length of copper or steel
pipe connected to the boiler.

• On new installations TRVs must be used on
all radiators except the radiator where the
room thermostat is sited, this must be fitted
with lockshield valves and left open. All
installations should have TRVs fitted to
radiators within the sleeping accommodation.

R
L

C
D

A - Appliance expansion vessel
B - Extra expansion vessel
C - Automatic bypass valve
D - Drain cock
E - Feed & expansion cistern

F - Feed & expansion 15mmØ min
G - Appliance
H - Open vent 22mmØ min
L - Lockshield valve
P - Pressure relief discharge

R - Radiators
S - Static head
T - TRV
U - To filling system

• Drain cocks are required at all the lowest
points on the system.
• Air vents are required at all high points on the
system.
OPEN VENT PRIMARY SYSTEM:

R
TYPICAL SEALED SYSTEM

• In order to comply with BS 5449 the feed
and expansion pipe and the open vent pipe,
(or the combined feed and vent pipe), must
be connected to the BSP outlet/s on the
right hand side of the primary heat exchanger.

R
L

• The feed and expansion cistern (E) must be
positioned to provide a static head (S) of at
least 1 metre above the highest point in the
heating system to the water level in the feed
and expansion cistern (E).

A
R
G

• Ensure adequate space is left in the expansion
cistern for expansion of the system water.

B
L

• An automatic bypass valve must be connected
between the heating flow and return where
TRVs are used on all radiators, fitted to give
at least a 3m circuit when activated.

• No valve shall be fitted in the open vent pipe
(H) or the feed and expansion pipe (F).

• The open vent pipe (H) must be at least 22mmØ.

U
C

SEALED PRIMARY SYSTEM:
D

• Where the system volume is more than 180
litres at 0.5 bar or exceeds 2.65bar at
maximum heating temperature an extra
expansion vessel (B) must be fitted as close
as possible to the appliance in the central
heating return.
• Pressurise the extra expansion vessel (B) to
the same figure as the expansion vessel built
into the appliance.

10
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

WATER SYSTEMS & PIPEWORK

WATER SYSTEMS & PIPEWORK
Water main
supply

Heating return
Hose
return

Non return Non return
valve
valve

Stop
cock
Temporary hose

Test cock

Stop
cock

FILLING PRIMARY SEALED SYSTEMS:
• Filling the system must comply with one of
the methods shown opposite.
• The filling point must be at low level and must
never be a permanent direct fixing to the
mains water supply.
• Filling loops must be WRAS approved.
SHOWERS/BIDETS:

Heating return

Make up
vessel

Auto air
vent

PRE INSTALLATION

Non return
valve

Stop
cock
Fill Point

1000mm above
the highest point
of the system

• If a shower head can be immersed in water or
comes closer than 25mm from the top edge
of a bath or shower tray spill over level then
an anti-siphon device must be fitted to the
shower hose.
• Only thermostatically controlled showers are
suitable for use with this appliance.
• Bidets with direct hot & cold mains water can
be used (with the approval of the local water
authority) and must be the over rim flushing
type with shrouded outlets to prevent the
fitting of hand held sprays.
DOMESTIC HOT WATER:

INSTALLATION

• Plastic pipework must not be used for
the DHW system.
• Taps and mixing valves must be capable of
sustaining a pressure up to 10 bar in
accordance with the Water Regulations as
they will be operating at mains water
pressure.

COMMISSIONING

• Hot water temperature and flow rate are
affected by the size and insulation of
pipework making up the distribution system
and are controlled by the hot water tap and
the water main inlet pressure. A mixing valve
can be fitted if a more permanent setting is
required.
• If using more than one outlet at once causes
water flow starvation, fit flow balancing valves
or Ball-O-Fix valves to the appropriate outlets.

11
WATER SYSTEMS & PIPEWORK

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

CONDENSATE &
PRESSURE RELIEF PIPEWORK

a
C

CONDENSATE PIPEWORK:

75mm
min.

• The condensate pipework must fall at least
50mm per metre towards the outlet and
should take the shortest practicable route
and not exceed 3 metres outside the building.
If a run greater than 3m is required, 32mmØ
polypropylene pipe must be used.

• All national and, where appropriate, local
regulations for the discharge and
neutralisation of condensate should be
followed.
• The condensate pipe must be a minimum of
21.5mmØ polypropylene pipe.

450 min.

A
D

• The pipework must follow one of the options
shown opposite:
a - Internal waste drainage system

Invert

b - Soil/vent stack
c - External drainage system

(Unsuitable for clay soil types)

d - External condensate absorption point

500mm min.

• Condensate pipework must not be connected
to rainwater downpipes.

PRE INSTALLATION

25mm
min.

I
H

400mm
min.

• Use waterproof pipe insulation in exposed
positions and for external pipework
IMPORTANT: Condensate pipework must not
leak and the condensate trap must be filled
with water before the boiler is started to
prevent the possibility of potentially harmful flue
products escaping via the condensate route.
A - Condensate from the boiler condensate
trap (supplied) which has a 75mm
minimum water seal.

200mm min.

B - Sink.
C - 21.5mm Ø polypropylene condensate pipe.
D - Gully.
E - Internal soil and vent stack.
F - 300mm x 100mm Ø sealed plastic tube.
G - Ground level.
H - Drainage holes 50mm from base of tube
(12mm Ø at 25mm centres) facing away
from building.
I-

Limestone chippings.

PRESSURE RELIEF PIPEWORK:

J
K

IMPORTANT: The pressure relief valve is a
safety device for the boiler and if activated may
discharge boiling water or steam through the
relief valve drain pipe.
Care should be taken when siting the outlet
pipe so that it does not cause an obstruction or
discharge above a window, entrance or other
public access where it could cause a hazard.
• The pressure relief drain pipe (K) should be
at least 15mm diameter copper pipe and run
downwards away from the boiler and discharge
away from any electrics or other hazard,
preferably to an external drain or soakaway.
• Pipe (K) should be finished with a partial
bend, near the outlet to face the external
boiler casing (as shown) to help prevent
freezing.
J -

External boiler casing.

K-

Pressure relief pipe.

12
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

CONDENSATE &
PRESSURE RELIEF PIPEWORK

BOILER LOCATION &
CLEARANCES
600mm
WARNING:
This appliance should not be installed where
there is a potential for excessive ground
water coverage.

2500mm*
FRONT

600mm

This boiler is only suitable for installing
externally at a suitable location onto a fixed
permanent rigid surface c apable of
supporting the boiler weight.
There must be a sufficient hard standing
around the appliance to allow for servicing.
The boiler must be installed on a flat level
surface to ensure that condensate does not
enter the primary heat exchanger.

PRE INSTALLATION

Tarmac and wood hardstandings are not
recommended.
600mm
(min)

BASE
CLEARANCES: Min service & flue clearances
Above
600mm
Front
600mm

2500mm*

RH/LH flue outlet on opposite side
RH flue outlet on rear
LH flue outlet on rear
Rear = flue outlet on side
Rear = rear flue outlet

10mm

Plan
view

10mm
85mm
10mm
150mm**
2500mm*

It is strongly recommended that the flue
terminal faces away from walls to reduce
the possibility of wetting occuring.
85mm
*This can be reduced to 1200mm if there is at
least 2500mm clearance on both sides of the
flue.

FRONT

** 200mm if a high level terminal is used exiting
through the rear panel.
600mm

150mm**

10mm

2500mm*

10mm

Plan
view

FRONT

600mm

13
BOILER LOCATION &
CLEARANCES

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

CABINET MOUNTED LOW LEVEL
Minimum dimensions of flue terminal positions for oil fired appliances:

FLUE TERMINAL POSITIONS
TERMINAL POSITION

B(H)
• Flue terminals must be positioned to avoid
combustion products entering into buildings.

Directly below an opening, air brick, opening windows, etc

600mm

Horizontally to an opening, air brick, opening window, etc

600mm

Below a plastic/painted gutter, drainage pipe or eaves if
combustible material protected

75mm

Below a plastic/painted gutter, drainage pipe or eaves without
protection to combustible material

600mm

From vertical sanitary pipework

300mm

From an external or internal corner or from a surface or boundry
alongside the terminal

300mm

Above ground or balcony level

300mm*

From a surface or boundary facing the terminal with 2500mm
clearance to both sides of the terminal

1200mm

From a surface or boundary facing the terminal with less than
2500mm clearance to either side of the terminal

2500mm

From a terminal facing the terminal with 2500mm clearance to
clearance to both sides of the terminal

1200mm

From a terminal facing the terminal with less than 2500mm
clearance to either side of the terminal

2500mm

Horizontally from a terminal

750mm

• The flue must be fitted and terminated in
accordance with the recommendations of
BS5410.
• The flue must not cause an obstruction.
• Discharge from the flue outlet must not be a
nuisance.

• There should be no restriction preventing the
clearance of combustion products from the
terminal.
• The air inlet/outlet duct and the terminal of
the boiler must not be closer than 25mm to
any combustible material. Detailed
recommendations on protection of
combustible materials are given in BS 5410:1

PRE INSTALLATION

• Flue gases have a tendency to plume and in
certain weather conditions a white plume of
condensation will be discharged from the flue
outlet which could be regarded as a
nuisance, for example, near security lighting.

• A protective terminal guard must be fitted if
the terminal is 2m or less above a surface
where people have access.
Stainless steel terminal guard.
Part No: 7 716 190 050
• The following additional guidelines (from part
L Exceptions Guidance Document) are
recommended when determining the flue
outlet position:

B(H) Balanced Horizontal flue

• Avoid discharging flue gases into car ports
or narrow passageways.

1 An opening means an openable
element, such as an openable
window, or a permanent opening
such as a permanently open air vent.

• *Minimum distance of the flue terminal from
above ground is 2100mm where directed to a
public footpath, private access route or a
frequently used area and 2500mm from a
car parking area.

Notwithstanding the dimensions
above, a terminal should be at least
300mm from combustible material,
e.g. a window frame.
2 A way of providing protection of
combustible material would be to fit
a heat shield at least 750mm wide.

boundary

C, D
F

I
A
H

B
F

J
F

boundary

14
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

CABINET MOUNTED LOW LEVEL
FLUE TERMINAL POSITIONS

Minimum dimensions of flue terminal positions for oil fired appliances:
TERMINAL POSITION

B(V)

POSITIONS

A1 2

Directly below an opening, air brick, opening window, etc

600mm

N/A

B1 2

Horizontally to an opening, air brick, opening window, etc

600mm

N/A

75mm

N/A

Below a plastic/painted gutter, drainage pipe or eaves without
protection to combustible material

600mm

N/A

From vertical sanitary pipework

300mm

N/A

From an external or internal corner or from a surface or boundry
alongside the terminal

300mm

N/A

Above ground or balcony level

300mm*

N/A

From a surface or boundary facing the terminal

600mm**

N/A

From a terminal facing the terminal

1200**mm

—

C
D3

PRE INSTALLATION

HIGH LEVEL FLUE TERMINAL

B(H)

Below a plastic/painted gutter, drainage pipe or eaves if
combustible material protected

Vertically from a terminal on the same wall

1500mm

N/A

Horizontally from a terminal on the same wall

750mm

—

Above the point of highest intersection with the roof

—

600mm

From a vertical structure on the side of the terminal

—

750mm

Above a vertical structure less than 750mm from the side of the terminal

—

600mm

—

300mm

—

1000mm

Q
R

From a ridge terminal to a vertical structure on the roof
Above or to the side of any opening on a flat or sloping roof
Below any opening on a sloping roof

• The flue must be fitted and terminated in
accordance with the recommendations of
BS 5410.
• The flue must not cause an obstruction.

• Flue terminals must be positioned to avoid
combustion products entering into buildings.

• Discharge from the flue outlet must not be a
nuisance.
• Flue gases have a tendency to plume and in
certain weather conditions a white plume of
condensation will be discharged from the flue
outlet which could be regarded as a
nuisance, for example, near security lighting.
• There should be no restriction preventing the
clearance of combustion products from the
terminal.
• The air inlet/outlet duct and the terminal of
the boiler must not be closer than 25mm to
any combustible material. Detailed
recommendations on protection of
combustible materials are given in BS 5410:1
• A protective terminal guard must be fitted if
the terminal is 2m or less above a surface
where people have access.
The guard must be spaced equally (minimum
50mm) around the flue and fixed to the wall
with plated screws.
Stainless steel terminal guard.
Part No: 7 716 190 050

Key: — Not applicable, N/A Not allowed, B(H) Balanced Horizontal flue, B(V) Balanced Vertical flue.
Notes:
1. Terminals should be positioned so as to avoid products of combustion accumulating in stagnant pockets around the building or
entering into buildings.
2. Vertical structure in N, O and P includes tank or lift rooms, parapets, dormers etc.
3. Terminating positions should be at least 1.8m from an oil storage tank unless a wall with at least 30 min fire resistance and
extending 300mm higher and wider than the tank is provided between the tank and the terminating position.
4. Where a flue is terminated less than 600mm away from a projection above it and the projection consists of plastics or has a
combustible or painted surface, then a heat shield of at least 750mm wide should be fitted.
5. If the lowest part of the terminal is less than 2m above the ground, balcony, flat roof or other place to which any person has
access, the terminal should be protected by a guard.
6. Notwithstanding the dimensions given above, a terminal should not be sited closer than 300mm to combustible material. In the
case of a thatched roof, double this separation distance should be provided. It is also advisable to treat the thatch with a fire
retardant material and close wire in the vicinity of the flue.
7. It is essential that a flue or chimney does not pass through the roof within the shaded area delineated by dimensions Q and R.
8. Where protection is provided for plastic components, such as guttering, it is essential that this is to the standard specified by the
manufacturer of the plastic components.

The following additional guidelines (from part
L Exceptions Guidance Document) are
recommended when determining the flue
outlet position:
• Avoid discharging flue gases into car ports
or narrow passageways.
• *Minimum distance of the flue terminal from
above ground is 2100mm where directed to a
public footpath, private access route or a
frequently used area and 2500mm from a
car parking area.
• **Minimum distance of the flue terminal to a
facing wall, fence, building or property
boundary is 2500mm.

P
Q

Q
Q

Q
O
M

boundary

R
F

Pitched roof

C, D

J
A
H

B
F

K
F

G
boundary

15
HIGH LEVEL FLUE TERMINAL
POSITIONS

Q
Flat roof

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
8 716 106 252d (08/07)

BALANCED EXTERNAL OILFIT
L = 2000mm

FLUE OPTIONS
IMPORTANT: The weather seal (supplied)
must be fitted to every flue joint to give
the required level of weather protection.

The diagrams (opposite) show the components
used and the maximum flue length (L) for
each flue configuration.

125mmØ x2

**
High level horizontal terminal (rear outlet)

In all cases L is measured from the outside of
the boiler casing.
• To achieve the maximum flue length (L), a flue
section will have to be reduced in length.

IMPORTANT: All horizontal sections must
rise away from the boiler by 52mm per
metre (3°) to allow the condensate to
drain back to the boiler.

L = 7000mm
L

D
F

PRE INSTALLATION

• Only the straight flue extensions can be
reduced in length by cutting.

B
B
125mmØ x5

Vertical terminal (rear outlet)

A - Horizontal terminal
B - Straight flue extension
C - Flue bend 90°
D - Flue bend 45°
E - Vertical Terminal Kit (incl. 90° elbow)
F - Horizontal terminal kit (incl. 90° elbow)
Calculating the flue length:

L = 6000mm

Measure the total flue length required, noting
that the maximum straight flue length including
the terminal is:
Horizontal 80/125mmØ: 4000mm.
Vertical 80/125mmØ / 100/150mmØ (25/32
only): 7000mm.
L

Then reduce the total straight flue length for
each extra flue bend (excluding the vertical flue
kit 90° elbow) by:

1000mm for 90°

500mm for 45°

B
Flue Extension lengths:

125mmØ x4

Horizontal & Vertical: 1000mm overall length.

**
Vertical terminal (rear outlet)

Effective length when engaged into sockets
within the flue run is 950mm.
Flue Terminal lengths:
Horizontal 80/125mmØ: 720mm
Vertical 80/125mmØ: 1080mm + cage
* Rear exit only.
** Horizontal flue runs should be kept as
short as possible.

L = 6000mm
L
E
C
B
125mmØ x4

**
Vertical terminal (side outlet)

16
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

BALANCED EXTERNAL OILFIT
FLUE OPTIONS

CABINET MOUNTED BALANCED
HORIZONTAL FLUE OPTIONS
• The horizontal flue is fitted to the rear or
either side of the cabinet.

REAR FLUE OUTLET
A+C

IMPORTANT:
It is strongly recommended that the flue
terminal faces away from walls to
minimise the occurance of wetting.

PRE INSTALLATION

Plan
view
FRONT
A - External horizontal flue kit
Part No. 7 716 190 052

LEFT HAND FLUE OUTLET
A+B+C

B - 90° inline elbow 80/125mm
Part No. 7 716 190 034

Plan
view
C - Terminal guard
Part No. 7 716 190 050
FRONT

RIGHT HAND FLUE
OUTLET
A+B+C

Plan
view

FRONT

17
BALANCED FLUE OPTIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

IIMPORTANT: All the previous Pre-Installation sections must be read
and requirements met before starting boiler or flue installation.

UNPACKING THE BOILER

LIFTING AND CARRYING PRECAUTIONS:
• Lift only a manageable weight, or ask for
help.

•

When lifting or putting things down, bend
the knees, and keep the back straight
and feet apart.

•

Do not lift and twist at the same time.

•

Lift and carry objects close to the body.

•

Wear protective clothing and gloves to
protect from any sharp edges.

1 Once the packaged boiler has been
delivered, the outer carton is removed first.
Care should be taken when releasing the
straps. If a sharp implement is used make sure
the outer carton is not pierced and that the
implement is used in such a way so that it may
not cause personal injury. All sharp objects
must be covered or the blade retracted after
use and put away in a safe place.
2 Lift carton up and away from the boiler.
Remove the plastic bag from the boiler and
place safely aside.

INSTALLATION

Unpacking:
It is advised that two or more persons are involved
in the transfer of the packaged boiler from the van
to the point of delivery.

18
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

UNPACKING THE BOILER

All dimensions in mm

256

374

PIPEWORK & FLUE POSITIONS

Flue

CAUTION: Ensure there are no pipes,
electric cables, damp proof courses or
other hazards before drilling.

171
Services

SAFETY:
All relevant safety precautions must be undertaken.
Protective clothing, footwear, gloves and safety
goggles must be worn as appropriate.

802

Condensate

650
PRV

PIPEWORK CONNECTIONS:

258

CH flow 22mmØ copper (28mmØ on
25/32kW model)

105
81
Fire valve capillary
& drain access

DHW flow 22mmØ copper

REAR

Mains water inlet 15mmØ
CH return 22mmØ copper (28mmØ on
25/32kW model)
Optional open vent 1'' BSP
Services duct 100mmØ
Drain/optional fill/feed & expansion 3/4'' BSP
Pressure relief pipe 15mmØ

161

670

COMMISSIONING

INSTALLATION

518

Condensate outlet 21.5mmØ
Flue

NOTE: For servicing purposes, keep the
condensate and pressure relief discharge
pipes away from components and pipework
connections.

Services

787

Condensate

650
528
269

230

PRV
Oil

105 94
55
658
669
705
715

RIGHT HAND SIDE
Fire valve capillary
& drain access

670
518

Flue

Services

794

Condensate

650

PRV
Oil

158
124 89.5
55
658
679
698
718

LEFT HAND SIDE

19
PIPEWORK & FLUE POSITIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

WARNING: THIS APPLIANCE IS SERVICED AND REPAIRED EXTERNALLY.

BOILER INSTALLATION

EXTERNAL EQUIPMENT OPERATED AT 230V SHOULD NOT BE INSTALLED, SERVICED OR
REPAIRED UNDER ADVERSE WEATHER CONDITIONS.
THIS APPLIANCE IS INSTALLED AND SERVICED EXTERNALLY TO THE PROPERTY, BUT
THE ENGINEER MUST HAVE ACCESS TO THE INSIDE OF THE PROPERTY WHEN
INSTALLING OR SERVICING THE APPLIANCE.

Note: The cabinet is not load bearing it
only provides weather protection for the
boiler inside.
1Mark position of the 100mm services
duct on the exterior wall and make a hole
through.
2Remove the key for the door fastners
from its transport position in the left hand
side panel flue outlet aperture.
Undo the screws at the bottom of
the front panel (using the key provided)
and remove the screws from the rear
panel pulling both panels out and down
to remove. Store safely away from the
installation point.

3Remove the screws from the top panel
and lift up to remove, store safely away
from the installation point.
C

5Remove the screws securing the control
box to the side panels and carefully rest
the control box on top of the heat
exchanger taking care not to snag or kink
the capillaries.

6Remove the screws securing the side
panels to the base panel and lift the side
panels off complete with the rear support
bar (shaded grey) and carefully stand the
panels away from the installation point.

INSTALLATION

4Slide the pressure gauge up out of its
bracket and carefully rest on top of the
heat exchanger taking care not to snag or
kink the capillary.

7Loosen the flexable air duct clamp (A)
and remove the air duct from the burner.
Depress the locking ears to unplug the
burner lead (B) from the control box (C).

Unscrew the burner retainers (D), then
withdraw the burner (E) from the boiler and
store safely away from the installation point.

8Remove the screws securing the base
panel to the transit pallet and lift the boiler
off the pallet and into its installation
position taking care not to scrape the
base panel across the hard standing. Do
not attempt to lift and position the
boiler on your own. Do not use the
copper pipes to move the boiler.
Fasten the base to the hard standing
using the holes provided. Care should be
taken to ensure that the base is level.

9Refit the side panels and rear support
bar and screw the side panels to the
baseplate and boiler.

E
D

7
A

Refit the control box and pressure
gauge taking care not to kink the
capillary tubes.
Measure the 100mmØ services duct to
give at least 10mm inside the casing and
to finish flush with the interior wall
surface, cut to size and fit the duct. Fit the
100mm sealing ring where the duct
enters the casing and seal the joint to the
exterior wall and inside the cabinet with a
suitable sealant.

20
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

BOILER INSTALLATION

FLUE INSTALLATION
INSTALLATION NOTES:
Ensure all the seals are in good condition
and seated properly.
To ease assembly of flue components,
grease seals lightly with the solvent free
grease supplied.
A terminal guard must be fitted if the
terminal is 2m or less above a surface where
people have access.

INSTALLATION

All flue options:
1 Lightly grease the flue cowl seal with the
solvent free grease supplied.
2 Carefully remove the blanking plate from
the appropriate flue aperture (if necessary)
and refit the blanking plate in the unused
aperture.
3 Carefully remove the insulation from the
flue aperture in the cabinet that the flue is
to pass through, and fit to the unused
aperture (if necessary).
4 Refer to the flue manual supplied with the
flue kit for flue installation.

21
FLUE INSTALLATION

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

COMBUSTION CHAMBER
F

Combustion chamber:
1 Release retaining nuts and washers (B).
Remove combustion chamber access
door (A).

2 Ensure the baffles (C) and baffle retainer
(D) are correctly fitted for the boiler output
as shown in the plan views opposite.

3 Refit combustion chamber door (A).
Secure with nuts and washers (B) and
tighten until the door is firmly secured, do
not over tighten the nuts.

4 Unscrew screws (E) and remove flue
manifold access cover (F).
5 Check that all the baffles (G) and baffle
retainer (H) or ( J ) are correctly fitted to the
secondary heat exchanger.

2
3
1

INSTALLATION

J
Plan sectional view

Plan sectional view

12/18 & 18/25kW

25/32kW

C
C

Hook the
retainer ( J )
over the
end two
baffles

FRONT

FRONT
22

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

COMBUSTION CHAMBER

CAUTION: ISOLATE THE OIL & WATER MAINS SUPPLY BEFORE STARTING ANY
WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.

PIPEWORK CONNECTIONS
A B C D E
F
G
N
O
P

CH flow 22mmØ copper (28mmØ on
25/32 models)
DHW flow 22mmØ
Water main inlet 15mmØ
CH return 22mmØ copper (28mmØ on
25/32 models)
10mmØ oil supply pipe connection
Oil isolating valve (10mmØ)
Flexible oil hose
Optional open vent/air vent
Drain/optional feed and expansion
Fixing point for optional return oil pipe

WATER CONNECTIONS:
All service pipes into the property must pass
through the services duct.
Insulate all the system/supply pipes where
the pipes pass through the duct with at least
22mm insulation around the pipes.
Remove the transit bungs from the pipework
connections on the boiler.
NOTE: that surplus water may be present due
to factory testing.

INSTALLATION

Ensure all pipework is clean.
Align water pipework through the 100mm Ø
duct and connect, ensuring that the
expansion tank and control box fit correctly
before permanently connecting the pipework.
Check that all unused sockets have been
capped.
OIL SUPPLY CONNECTIONS:
NOTE: Oil filters and de-aeration devices are
not to be fitted within the casing and the fire
valve body must be at least 1 metre from the
external casing.
Route the oil supply pipe through the
appropriate casing hole as required and
connect to the isolating valve (F) and ensure
the valve is closed.
Connect the flexible oil hose (G) to the
isolating valve (F).
Pass the fire valve sensor through the most
appropriate casing hole and locate the
capillary in the cut out at the bottom of the
hole.
Clip the sensor into the clip provided at the
rear of the control box.
Rotate the cover plate and seal so it does not
cover the capillary, then secure with the screws
provided.

23
PIPEWORK CONNECTIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

PIPEWORK CONNECTIONS
-

Flue manifold condensate outlet
Condensate outlet (21.5mmØ) - supplied
Condensate pipe - not supplied
Condensate trap with clamp - supplied
Pressure relief (15mmØ)

CONDENSATE CONNECTION:
The condensate trap (L) must be installed
onto the bracket supplied.
Measure condensate pipe (J) mark and cut
square to length required.
Fit sealing washer inside condensate pipe
nut and connect to the flue manifold outlet (H).
Connect 21.5mm polypropylene pipe (K) (not
supplied) to the condensate pipe (J)
and condensate trap (L) before terminating
to waste.
Secure the condensate trap (L) with clamp
supplied.
Ensure that the condensate pipe runs away
from the boiler at a constant fall of 50mm
(min.) for every metre.
Carefully pour 500ml of water into the
condensate collection (R) to fill condensate trap.
Check the water is running away and the
condensate pipework joints are water tight.
Check the flue manifold seal is undamaged
and seated correctly.
Refit flue manifold access cover (Q) and
secure with screws (P).
IMPORTANT: The condensate trap must be
correctly filled to prevent the possibility of
potentially harmful flue products escaping
via the condensate pipework.

INSTALLATION

H
J
K
L
M

PRESSURE RELIEF CONNECTION:
Connect the pressure relief pipe (M) to a
copper discharge pipe (15mmØ min.) and
terminate externally to the appliance casing.
Blank all unused casing holes with the bungs
or cover plates and seals supplied. The
drain/fire valve capillary hole covers should
be rotated so that the unused capillary slot is
covered by the cover plate and seal.
Refit rear panel.
Seal all joints where pipes pass through the
casing, with suitable waterproof sealant.

IMPORTANT: Insulate all
external condensate pipe
work or run in 32mm pipe
work to prevent freezing.

24
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

PIPEWORK CONNECTIONS

OIL BURNER & PUMP
12/18 & 18/25 kW

Electrode gap
2.5 - 3.0mm

CAUTION: ISOLATE THE OIL & WATER
MAINS SUPPLY BEFORE STARTING ANY
W OR K AN D OB S E RVE ALL R E LE VANT
SAFETY PRECAUTIONS.
OIL BURNER:

1 Check the nozzle (A) and electrode (B)
settings are correct for the relevant burner
as shown opposite.

5mm

Ensure nozzle (A) is aligned centrally within
the combustion head (C).

5mm

Inspect for any visible defects.

7.5mm

1
25/32 kW

INSTALLATION

IMPORTANT: Whenever replacing the
combustion head, ensure that the photocell
is lined up with the sight hole.
5mm

5mm
OIL PUMP:

Connecting the oil pump for a single pipe
system:
The pump is factory set for single pipe
operation with the flexible oil hose fitted.
Check connections before use.

Electrode gap 4mm

Converting the oil pump for a double pipe
system:
a) DANFOSS BFP 11 L3 OIL PUMP

1 Check the inlet hose connection.

b) SUNTEC AS47C OIL PUMP

a) DANFOSS BFP 11 L3:

Remove pump front cover (A) ensuring a
suitable receptacle is used to catch any oil
residue.
Remove changeover screw (B).

Remove horseshoe washer (C).
Refit changeover screw (B).
Refit front cover (A).

2
1

1
2

Remove oil pump return plug (2).
b) SUNTEC AS47C:
Remove return port plug (2) and insert
grub screw (B).

c) RIELLO RDB OIL PUMP

c) RIELLO RDB:
Unscrew return plug (2).
Screw in by-pass screw (3).
2 Connect the flexible oil return hose
(not supplied) between the oil pump and
the return line connection, and tighten to
secure.

1
3
2

25
OIL BURNER & PUMP

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

REFITTING COMPONENTS
1 Align burner combustion head (A) into boiler
housing tube with gasket (B) correctly fitted.
Push firmly down to compress the gasket (B).
Tighten burner retainers (C) sufficiently to
ensure a good seal.
IMPORTANT: Ensure the gasket is a good
seal between the burner combustion head
and the boiler housing to prevent flue gases
escaping from the combustion chamber
into the cabinet.
B
A
C

Attach the flexible air duct and tighten
clamp(D) to secure to the burner air intake.
2 Plug burner lead (E) into control box (F).

INSTALLATION

26
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

REFITTING COMPONENTS

ELECTRICS

DANGER - 230V:
ISOLATE THE MAINS ELECTRICITY
SUPPLY BEFORE STARTING ANY
WORK AND OBSERVE ALL RELEVANT
SAFETY PRECAUTIONS.

C
B

IMPORTANT: THIS APPLIANCE
PROVIDES A PERMENANT EXTERNAL
ELECTRICAL SUPPLY FOR SERVICING
AND MUST THEREFORE BE FED VIA A
CIRCUIT BREAKER INCORPORATING
EARTH LEAKAGE PROTECTION.

230V
MAINS
SUPPLY

IMPORTANT: OBSERVE ELECTRONIC
STATIC DISCHARGE PRECAUTIONS.
DO NOT TOUCH THE PCB CIRCUITS.

A
D

2/3
F

WARNING: EXTERNAL EQUIPMENT
OPERATED AT 230 VOLTS SHOULD NOT
BE SERVICED OR REPAIRED UNDER
ADVERSE WEATHER CONDITIONS.

G
E

INSTALLATION

Accelerator
resistor
(if fitted)

Access to 230V connections:
1Release screws (B) and remove cover
panel (C) from control box (A).
2Release screws (D) from cable clamp (E).
Pull inner clamp part (F) outwards.
Feed sufficient power cable (G) through the
cable clamp (E) and secure grip with screw (D).
Separate wires from cable end and strip to 6mm.

ROOMSTAT

CH channel

clock

HW channel
Live

Any external device connected to the
boiler must take its power supply from
the boiler supply only and must NOT
have a separate supply.

X2
Ns Fs

N
L

LR Ls FR

DHW
CH

CONTROL
BOARD

Fuse

N Supply

FROST
STAT(2)

FROST
STAT(1)

CH Demand

Switched Live

L Supply
HW Demand

Neutral (if required)

PROGRAMMER (EXTERNAL)

230V connections (terminal block X1):
3Connect LIVE wire (Brown) to terminal L.
Connect NEUTRAL wire (Blue) to
terminal N.
Connect EARTH wire (Green/Yellow) to
the connector
.
Route the power cable down the side panel and
through the service duct to the internal property
connection point avoiding any potentially hot
surfaces.

External 230V programmer
(terminal block X4):
4 Remove 4 pin plug (M) from X4.
Remove test links (P) from plug block (M).
Connect wires to plug block (M) as shown.
Fit plug into terminal block X4.
Connect earth to terminal block X1connector
.
230V room thermostat (terminal block X2):
6 Remove link (K).
Connect LIVE supply to terminal LS.
Connect SWITCHED LIVE supply to
terminal LR.
NOTE: This is sometimes refered to as ‘call
for heat’ or ‘heating load’.
Connect NEUTRAL to terminal Ns.
NOTE: Some devices do not require this.
Refit electric control panel cover:
Refit panel (C) and secure with screws (B).

NOTE: Both frost thermostats are fitted as
standard to the external appliance to provide
frost protection.

27
ELECTRICS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

ELECTRICS
Electrical components:
1 Printed circuit board
2 Thermostat - boiler high limit
3 Thermostat - DHW control
4 Thermostat - CH control
5 Indicator lamp - boiler mode
6 Indicator lamp - lock-out
7 Manual reset - overheat thermostat
8 Manual reset - flue overheat thermostat
9 Manual reset - burner lock-out
10 External programmer (not supplied)
11 Burner socket
12 Burner plug
13 Burner control box (12/18 & 18/25 shown)
14 Flow switch
15 Circulating pump
16 Diverter valve
17 Frost stat
18 Frost stat

1 NL

Mains
connection

18
Mode
switch

Service
connection
1
gy gy

X3
y

gy
bl

gy
or
bl
br
g

X7
X6

X11
gy

pk
pk

g
bk

bl
br
w
g

X8
w

X12

pk
or
y

X10

X13

Wire colour code:
br - Brown
bl - Blue
gy - Green/Yellow
r - Red
w - White
y - Yellow
g - Grey
bk - Black
or - Orange
pk - Pink

INSTALLATION

230V

2
3

r or g
w

4
3

w
bk r

8
11

pk pk

g gy w

1 2 3 4 5 6

1 2 3 4 5 6
bk r

g gy w

gy
bl

br
g bk r gy w
gy
or
bl
br
g

1 2 3 4 5 6 7 8 9

28
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

ELECTRICS

PRE-COMMISSIONING CHECKS APPLIANCE
1
CAUTION: ISOLATE THE MAINS SUPPLIES
BEFORE STARTING ANY WORK AND
OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.

1 Check that the service and water pipes are
connected correctly.

Check that all unused sockets are capped.
2 Check that the oil supply is kerosene and
that the pipework is connected correctly
to the oil pump via the supplied flexible oil
hose.
Turn on the main oil supply valve at the
tank, check the oil supply pipework and
connections. Rectify any leaks.
3 Check the flue is correctly fitted and the
connections are secure.
4 Check the condensate pipework is
correctly fitted and connected.

Check the condensate trap is filled with
water.
5 Check the CH circulating pump is set to 3.

NOTE: The CH circulating pump is preset to
number 3 and should not be altered. The
diagrams opposite show the pump outputs.

COMMISSIONING

NOTE: The cabinet is not load bearing, it only
provides weather protection for the boiler
inside.

12/18 & 18/25
0.6
0.5
0.4

Bar
0.3
0.2
0.1
0

200

400

600

800

IMPORTANT: If the boiler is not to be
commissioned immediately then:

1000 1200 1400 1600

Litres per hour

After successfully completing all of the
checks and any rectification work, close the
water valves, shut off the oil supply and
electrically isolate the boiler.

25/32
0.7

Complete the installation part of the
Guarantee Registration Card, and complete
a CD10 or its equivalent, to inform the LABC
of the installation.

0.6
0.5

Bar
0.4
0.3
0.2
0.1
0

200

400

600

800

1000 1200 1400 1600 1800

2000 2200 2400

Litres per hour

29
PRE-COMMISSIONING
CHECKS - APPLIANCE

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

FILLING THE SYSTEM
1
B

1 Pull lever (C) up and push to the left to
move the diverter valve to the mid-position
between ports A and B.

A
C

Push and hold lever (C) down to lock.
2 Loosen the automatic air vent cover.
4 Sealed systems only; check and if required,
adjust the expansion vessel pressure using
the Schraeder type valve (D).

The charge pressure of the built-in 12 Litre
expansion vessel is 0.5 bar as dispatched,
which is equivalent to a static head of 5
metres (16.7 ft).

Total system Initial system Initial charge
volume (litres) pressure (bar) pressure (bar)
0.5
0.5
180
1.0
0.5
107
1.0
1.0
138

If an extra expansion vessel is fitted to the
central heating return, adjust this to the same
pressure as the appliance internal expansion
vessel, refer to separate instructions supplied
with the extra expansion vessel.
4 Open all system and radiator valves (E).
Turn on the water main stop cock.

Open vented systems only; turn on the
water to the system feed and expansion
cistern and allow the system to fill.
Sealed systems only; fill the system to
between 1 and 2 bar pressure via a WRAS
approved filling link. Monitor the pressure
gauge during venting and repressurise if
required.

Check air is being discharged from the
automatic air vent.
Vent all radiators, retighten when completed,
check the system and correct any leaks.

COMMISSIONING

1 - 2 bar

Bleed air from both of the secondary heat
exchanger air vents (F).
Bleed air from the pipework using the
pump bleed screw.
5 Sealed systems only; connect a suitable
hose to the Heatslave tank drain. Open the
drain valve to reduce the system to the
correct pressure, then close the drain valve.
Ensure safe disposal of the discharge.
Rotate the adjustable pointer on the
pressure gauge to record the set system
pressure.

6 Check system and rectify any leaks.
Push lever (C) to the left and pull
upwards to allow the lever to return to
position A.
Leave the lever (C) unlocked at
position A.

B
C

30
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

FILLING THE SYSTEM

STARTING THE APPLIANCE
IMPORTANT: Never run the appliance when
the appliance/system is unpressurised
(sealed systems) or empty.

1Check the oil supply is correctly fitted and
in good working order before turning on
the oil supply valves to the boiler.
on

max

service

max

Turn on the main oil supply valve at the tank
and draw off at least 21/2 litres of oil until a
steady flow of clear uncontaminated oil can
be seen as follows:

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

DANFOSS

SUNTEC

RIELLO

BFP 11 L3 OIL PUMP

AS47C OIL PUMP

RDB OIL PUMP
A

C
D

B - Pressure adjustment
C - Vacuum gauge port

Single pipe gravity feed systems:
Disconnect the flexible oil hose and open
the isolating valve to discharge the oil into a
suitable container.

When completed, close the isolating valve,
reconnect the flexible oil hose.

D - Retaining screws - cover

COMMISSIONING

• The use of an oil suction pump will prime
and flush through any oil supply set up
simply and easily, alternatively the
following procedures can be used.

If a top entry tank has been used the
pipework will need to be primed before the
oil will discharge under gravity.

A - Bleed & pressure gauge port

E - Lockout indicator

BURNER LOCKOUT

• The oil supply to the boiler should be
primed before the burner is operated to
avoid unnecessary pump wear.

Double pipe sub-gravity feed systems
and single pipe suction lift with de-aerator:
To prime a de-aerator, disconnect the
flexible oil inlet hose (F) from the isolation valve
and place in a container of kerosene (G).
Connect a spare flexible oil hose (H), to
discharge into container (G). Open the
isolating valve, turn on the power to the boiler
and set the programmer to ON. Prime the
de-aerator until there is a steady flow of oil into
container (G). Turn off the boiler then
reconnect the flexible oil inlet hose (F).

BURNER LOCKOUT RESET
BUTTON (D) FOR 12/18
& 18/25 MODELS
(Under control box)

BURNER LOCKOUT RESET
BUTTON (D) FOR

Turn on the boiler, the oil level in the
de-aerator will drop as the oil is used until
the oil is drawn from the tank. If the
de-aerator empties and the burner locks out
before the oil is drawn from the tank, prime
the de-aerator again.

25/32 MODEL
(On top of burner control box)

Open the isolating valve and the oil pump
bleed valve (A) to discharge into a suitable
container once the boiler is started up.
Switch on the electricity supply to the boiler.
Set the programmer to ON for CH and DHW.
Turn on the boiler CH control thermostat.
Return

Allow the burner to run through to lockout
indicated by the illumination of the lockout
indicator (E).

Flow

Wait 2 minutes then press the lockout reset
button (D).

TANK

F
G

Repeat the procedure at least 3 times or until a
steady stream of oil, without air, runs from the
bleed port, then relock the bleed port (A).
Switch off the boiler.
Remove the oil pump filter, clean with
kerosene and refit.
The internal filter is accessed by removing
the oil pump cover on the Danfoss BFP 11
L3, Suntec AS47C and Riello RDB.
Safely dispose of the container/discharge.

31
STARTING THE APPLIANCE

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

STARTING THE APPLIANCE

D
25/32
(on top of burner
control box)

D
12/18 & 18/25
(under control box)

3
K

DANFOSS

SUNTEC

RIELLO

BFP 11 L3 OIL PUMP

AS47C OIL PUMP

RDB OIL PUMP

If after-spurting occurs:
Release the burner retainers.
Remove the burner, combustion head (F).
and electrodes, hold the burner vertical
to unscrew the nozzle and fill the nozzle
holder with oil.
Refit nozzle, electrodes, combustion
head (F) and the burner.
Restart and run for 3 minute intervals until
after-spurting stops.
4Start and run for 20 minutes.
Remove sampling point plug (K) to check
the smoke reading is between 0-1. If the
smoke level is above 1, check the combustion
settings are correct and the oil nozzle is in
good condition.

B
B

If the burner fails to establish a normal firing
pattern or flame failure occurs the flame
monitoring photocell mounted in the burner
body will alert the burner control box to shut
the burner down and provide a safe lockout
state indicated by the illumination of the
lockout indicator (E).
Wait 2 minutes then press the lockout
reset button (D) to initiate another start
sequence.
Repeat procedure until a flame is established.
3Start and run for 3 minutes then switch off.
Check for after-spurting from the nozzle,
indicated by oil saturation on the combustion
head (F).

Boiler lockout indicator on:

A
A - Bleed & pressure gauge port
B - Pressure adjustment
C - Vacuum gauge port

COMMISSIONING

2Remove plastic cover from the burner casing
(there is no plastic cover on the Riello burner).
Fit a suitable pressure gauge to port (A) on
the oil pump.
Adjust the air shutter (L) and pump pressure
(B) as shown in the table opposite. The
burner should ignite following a pre-ignition
period of approx. 15 seconds.

Note; smoke readings may be inaccurate until
the smoke from burning organic binder in the
access door insulation has ceased.
L

Check the CO2 levels and adjust the air
shutter (L) setting according to the table
opposite.
Check the flue gas temperature is close to
the values shown in the table.

NOMINAL BOILER RATING AT NORMAL OPERATING
TEMPERATURE USING 28sec KEROSENE:
OIL PUMP
NOZZLE

FUEL

PRESSURE FLOW RATE
(p.s.i.)

Kg/h

l/h

APPROX.
FLUE GAS

APPROX.
%CO2

TEMP °C

APPLIANCE

AIR

INPUT

SETTING

OUTPUT

Btu/hr

12/18 - Bentone Sterling 40 Burner:
0.35 80°SR

115

1.04 1.32

11.5

2.5

12.4

42300

40900

0.45 80°S

115

1.29 1.63

12.0

4.5

15.5

52900

51200

0.50 80°ES

140

1.55 1.96

12.5

5.25

18.6

63500

61400

18/25 - Bentone Sterling 50 Burner:
0.50 80°EH

130

1.56 1.98

11.5

4.25

18.6

63500

0.55 80°EH

145

1.86 2.36

12.0

6.0

22.2

75750 21.5

73400

0.65 80°EH

150

2.17 2.75

12.5

8.0

25.8

88000

85300

If the flue gas temperature is too high and the
baffles are correctly fitted, then reduce the oil
pump pressure (B) 5-10p.s.i. to compensate
for nozzle variations.
Turn off the electrical supply.
Isolate the oil supply to the burner.
Remove the oil pressure gauge.
Refit the blanking plug (A).
Check and rectify any oil leaks.
5Switch on the oil supply.
Switch on the electrical supply.
Restart the boiler and run for 5 minutes.
Recheck the CO2 levels and if required,
adjust the air shutter setting (L) to obtain
the correct CO2 level.

25/32 - Riello RDB Burner:
0.75 60°ES

105

2.15 2.72

11.5

3.0

25.5

87000 25

0.75 60°ES

140

2.45 3.1

12.0

4.0

29.1

99300 28.5

0.85 60°ES

150

2.75 3.48

12.5

5.0

32.7 111600 32

97200
109200

32
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

STARTING THE APPLIANCE

STARTING THE APPLIANCE
Domestic hot water:
1Set the CH/DHW programmer to OFF.
Fully open a hot water tap.

The burner should be OFF and the circulating
pump ON.

2
on

max

service

max

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

3 Fully open a hot water tap.
The burner should be ON with the circulating
pump.
Check the water flow rate using a suitable
measuring container;
12/18KW 15 litres/min
18/25kW 18 litres/min*
25/32kW 22 litres/min*
* Manually regulate using the water main
inlet isolating valve on the boiler.
4 Fully close the hot water tap.
Check the burner and circulating pump**
switch off.

3
on

COMMISSIONING

2Close the hot water tap.
Set the DHW thermostat control (C) to
minimum as shown.
Set the programmer to DHW ON.
The burner should be ON with the circulating
pump to heat the water in the Heatslave
external tank.
When minimum set temperature is reached
the burner and circulating pump will switch
off.

max

service

max

**The high limit thermostat may activate
pump overrun until the correct
temperature is restored.

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

max

service

max

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

33
STARTING THE APPLIANCE

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

STARTING THE APPLIANCE
1

max

service

max

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

Central heating:
1 Open all radiator valves.
Set room thermostat to maximum.
Set programmer to ON for CH.
Turn the DHW thermostat control (C) fully
anti-clockwise.
Turn the CH thermostat control (D) to max.
The burner should be ON with the circulating
pump. The diverter valve (E) should open to
port B for CH.
Ensure all radiators are heating up evenly
and balance the system to the temperature
difference required across the heating flow
and return relevant to the heating load.

D
E

2Set the room thermostat to minimum.
The burner and circulating pump should be
off. The diverter valve (E) should return to
port A for DHW (default).

service

max

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

The burner should be ON with the circulating
pump. The diverter valve (E) should open to
port B for CH.

4Set the DHW thermostat control (C) to max.
The diverter valve (E) should move to port A
and divert the flow to the Heatslave tank.

max

service

max

COMMISSIONING

max

Domestic hot water & central heating:
3Set the room thermostat to maximum.
Set the programmer to ON for DHW & CH.
Turn the DHW thermostat control (C) fully
anti-clockwise.
Set the CH thermostat control (D) to max.

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

4
on

max

service

max

lockout
flue
reset

boiler
reset

GREENSTAR HEATSLAVE EXTERNAL

D
E

34
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

STARTING THE APPLIANCE

WATER TREATMENT
IMPORTANT: Debris from the system can
damage the boiler and reduce efficiency.
Failure to comply with the guidelines for the
use of water treatment with the appliance
will invalidate the appliance warranty.

FLUSHING (Central Heating):
1Switch off the boiler.
Open vented systems only: turn off the
water to the system header tank.
Open all radiator valves/drain cocks (C) and
drain the system while the appliance is hot.
Close drain cocks (C).

2Add a suitable flushing agent (F) and refill
the system at the correct strength for the
system condition in accordance with the
manufacturer's instructions.
Vent the boiler (there are two vent points
(A) at the top of the secondary heat
exchanger. Only one may be in use, the
other may be obscured by side fluing.
Always vent (A) and the vent screw (B) on
the pump and all radiators.
Run the boiler/system at normal operating
temperature for the time stated by the
flushing agent manufacturer.

3Drain and thoroughly flush the system and
boiler to remove the flushing agent and
debris (C).

3
B

INHIBITOR (Central Heating):
4Check drain cocks (C) and manual air vents
are closed and all radiator valves are open.

COMMISSIONING

5Add a suitable inhibitor (I), (or combined
inhibitor/anti-freeze if the system is exposed
to freezing conditions) to the heating system
in accordance with the manufacturers
instructions.

The inhibitor or combined inhibitor/anti-freeze
must not cause damage to the materials within
the boiler (mild steel, stainless steel, copper
and brass) and any other materials/components
within the system.

Open vented systems only: turn on the
water to the system header tank and allow
the system to fill.
Sealed systems only: fill the system to
between 1 and 2 bar via a WRAS approved
filling loop. Check the system pressure
during venting and repressurise if
necessary.

6Vent the boiler (there are two vent points
(A) at the top of the secondary heat
exchanger. Only one may be in use, the
other maybe obscured by side fluing.
Always vent (A) and the vent screw (B) on
the pump and all radiators; retighten vents
when complete.

1 - 2 bar

7Record the date when the inhibitor was
added to the system on the guarantee card.
NOTE: The concentration level of inhibitor
in the system should be checked every 12
months or sooner if system content is lost.

The addition of sealing agents to the system
water is not advised as this can cause
problems with deposits left in the heat
exchanger and invalidate the appliance and
heat exchanger warranty .

35
WATER TREATMENT

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

FINISHING COMMISSIONING APPLIANCE
1 Refit the top panel and press down to
compress the seal when fitting the
securing screws (A).
2 Push the front panel up behind the top
panel and push in at the base to secure
the screws (B) with the tool provided.

A
A

Always apply pressure at the edges of the
panels when securing to avoid accidental
damage.

COMMISSIONING

B
B

Handover:
Complete the guarantee registration card,
combustion record (page 49) and a CD11 or
an equivalent commissioning form.
Set up the controls and show the user how
to operate all the controls shown in the User
Guide, and all system controls.
Where applicable, instruct the customer how
to repressurise the system.
If the appliance is unused and exposed to
freezing conditions, shut off all the mains
supplies and drain the system and boiler to
prevent damage to the system and boiler.
NOTE: Release drain point (K) to drain the
secondary heat exchanger.

36
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

FINISHING COMMISSIONING APPLIANCE

INSPECTION AND SERVICE
CAUTION: ISOLATE THE WATER,
ELECTRICITY AND OIL MAINS SUPPLIES
BEFORE STARTING ANY WORK AND
OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.

DO NOT USE PRESSURE WASHERS OR
STEAM CLEANERS ON THIS APPLIANCE
OR ITS CABINET.

service

WARNING: EXTERNAL EQUIPMENT
OPERATED AT 230 VOLTS SHOULD NOT
BE SERVICED OR REPAIRED UNDER
ADVERSE WEATHER CONDITIONS
Routine servicing:

To maintain efficient boiler operation, the
following should be carried out at least once a
year:

Carry out a pre-service check and note any
operational faults:

2
Pre-Service Check:

B
G

1Unndo the screws at the base of the
front panel using the tool provided and pull
the panel down and out to remove.
Store safely away from the working area.
Operate the appliance and system and note any
faults which may need to be corrected during
the service.
Switch into service mode at switch (A).
2Depress locking ears and unplug burner
lead (B) from control box (C).
• An adapter lead is available to allow mains
voltage service aids to be operated from
the service connection (G). (Service lead
Part No. 8 716 113 483 0).
3Loosen clip (D) to detach air duct.

SERVICING
& SPARES

4Unscrew burner retainers (E) to release
the burner combustion head (F).
Lift burner away, taking care not to over
strain the flexible oil hose/s or
connections.

3
D

4
F
E

See the following instructions for detail of some
of the service requirements listed
below:
Check and clean the burner.
Replace burner nozzle and flexible oil
hose/s.
Check and clean the baffle retainers.
Check and clean the baffles.
Check and clean the heat exchangers
surfaces.
Check the combustion chamber access
door insulation board.
Check that the flue system is unobstructed
and clean as necessary.
Clean or replace all oil filters.
Check that the condensate system is not
obstructed, clean and refill the condensate
trap as necessary.
Sealed systems only: The PRV is a safety
device and must be checked for correct
operation.
The expansion vessel pressure must be
checked and adjusted as required.

37
INSPECTION AND SERVICE

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

INSPECTION AND SERVICE
1 Clean the Burner:

12/18 & 18/25
P

Remove the air intake cover (H) and clear
any debris from the air intake and air damper.
Disassemble the burner to allow access to
the fan impeller.
Check the condition of the gaskets between
these parts and replace if necessary.
Note the position of the air damper
adjustment and check the air damper moves
freely.
Clean both sides of the fan impeller and
remove any debris from the burner housing.
Check that the impeller rotates freely.
Reassemble the components.
Remove the combustion head (K) and
thoroughly clean any deposits.
Remove the nozzle (E).

H D
N

Electrode gap
2.5 - 3.0mm
M
O
L

5mm

2 12/18 & 18/25 Inspection of Mechanical
Shut-off Valve:

Fasten an M5 screw, with a minimum length
of 30mm, into the threaded hole (L) and pull
the screw to withdraw the check valve (M).
Check that the nozzle holder (N) is clear of
any debris and clean if necessary.
Check that the three holes in the check valve
(M) are clear of any debris. Check the
condition of the 'O' ring (O). Discard the
check valve if the holes cannot be cleared, if
the unit is defective or if the 'O' ring is
damaged and replace with a new one.
Refit the check valve.

7.5mm

25/32
P

H D

25/32
Check the nozzle holder is clear of any debris
and clean if neccessary.
F

5mm

12/18, 18/25 & 25/32
Fit a new oil atomising nozzle (E).

Check the electrodes (F) and reset if
necessary as shown opposite.
Refit the combustion head. Check that the
nozzle (E) lies centrally in the combustion
head and the head settings are as shown.
Ensure that the photocell is lined up with the
sight hole.
Withdraw the photocell (P) from its housing
and wipe clean.
Remove the oil pump internal filter, clean in
kerosene and reassemble.

Electrode gap 4mm

DANFOSS

SUNTEC

RIELLO

BFP 11 L3 OIL PUMP

AS47C OIL PUMP

RDB OIL PUMP

A
B

A - Retaining screws - cover

The internal filter is accessed by removing
screws (A) and the oil pump cover (B) on the
Danfoss BFP 11 L3, Suntec AS47C and Riello
RDB.

A
B

SERVICING
& SPARES

DO NOT dismantle the nozzle and DO NOT
clean the nozzle tip.

Replace the standard flexible oil hose/s at
every annual service to prevent the
possibility of leakage due to ageing.
Reassemble the burner components.
Check the sponge O-ring seal located
around the combustion head and replace if
necessary.
This seal must be in good condition since
failure will cause flue gases to escape into
the cabinet.

B - Cover - oil pump

38
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

INSPECTION AND SERVICE

INSPECTION AND SERVICE
External oil filter:
Remove the paper element from the external
oil filter and replace it. If the filter contains a
washable element, thoroughly clean in
kerosene and reassemble into the filter.

Clean the boiler:
Manifold access:

E
F
J
H
K
G

J
H
G
A

SERVICING
& SPARES

Plan sectional view

25/32kW

12/18kW & 18/25kW

C
C

Remove top cover by releasing the
screws at each corner and lift free.
Release screws (E) to remove the flue
manifold access cover (F) and clear any
debris.
Check the condensate route (G) is clear and
clean the condensate trap and pipework.
Check the flue system and clean if necessary.
Remove the baffle retainer (J) and baffles (H)
from the secondary heat exchanger.
Check and clean the secondary heat
exchanger surfaces.
NOTE: Do not use wire brushes and
cleaning agents to clean the stainless steel
secondary heat exchanger components.
Pour 500ml of water into drain (G) to refill the
condensate trap.
Clean the secondary heat exchanger baffles
(H) if necessary and refit correctly.
Refit the baffle retainer (J).
Check the seal on the manifold access cover
(F) and replace if necessary.
Refit the flue manifold access cover (F)
and secure with screws (E).
Combustion chamber:
Release the M10 retaining nuts and washers
(B) and remove combustion chamber access
door (A).
Check the fibreglass rope seal on the
combustion chamber access door (A) and
replace if necessary.
Remove and check the baffle retainer (D).
Remove the baffles (C), clean and check the
condition of the baffles and the acoustic
insulation. Replace any baffles or insulation
pads considered to be badly corroded/degraded.
Thoroughly clean all of the heat exchanger
surfaces using a suitable brush and clear all
loose debris from the combustion chamber.
Check the condition of the combustion
chamber access door insulation. If the
insulation is damaged the door assembly
must be replaced.
Refit the items in reverse order ensure the
baffles (C) and baffle retainers (D) are
correctly fitted for the boiler output as shown
in the plan view opposite.
Refit combustion access door (A).
Secure with nuts and washers (B) and
tighten until the door is firmly secured, do not
over tighten the nuts.
Fire valve:

FRONT

Check that the oil supply pipe has a fire valve
fitted at least 1m away from the appliance
with the fire valve sensor located within the
appliance case. A fire valve sensor clip (K) is
provided for this purpose.

FRONT

39
INSPECTION AND SERVICE

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

INSPECTION AND SERVICE
B
A
C

Re-commission the burner:
1Align burner combustion head (A) into the
boiler housing tube with gasket (B)
correctly fitted.
Push firmly down to compress the gasket (B).
Tighten burner retainers (C) sufficiently to
ensure a good seal.

IMPORTANT:
Ensure the gasket is a good seal between
the burner combustion head and the boiler
housing to prevent flue gases escaping.
Refit flexible air duct and secure with clip (D).
2Plug burner lead (E) into control box (F).
Connect an oil pressure gauge to the oil
pump, run the burner and check the oil
pressure is correct for the required boiler
output. Check that the smoke reading is
between 0 and 1, if the smoke reading is
above 1 check the air setting. If the air
setting is correct check that the burner has
been reassembled correctly.
Allow the boiler to warm up then check the
combustion settings are correct as
indicated in the table below, adjust the
CO2 if necessary using the air shutter.
When the combustion is correct turn off the
boiler, remove the pressure gauge and refit
the blanking plug and plastic cover.

Refit panels:
3Refit the top panel and press down to
compress the seal when fitting the
securing screws.
Push the front panel up behind the top
panel and push in at the base to secure
the screws with the tool provided.
Make a note of the date of any water treatment.
Set the controls back to the users
requirements.
Complete the service interval record at the
back of this manual and a CD11 or an
equivalent form.
If the appliance is unused and exposed to
freezing conditions; shut off all the mains
supplies, isolate the boiler and drain the
system and boiler, including the secondary
heat exchanger.

NOMINAL BOILER RATING AT NORMAL OPERATING
TEMPERATURE USING 28sec KEROSENE:
OIL PUMP
NOZZLE

FUEL

PRESSURE FLOW RATE
(p.s.i.)

Kg/h

l/h

APPROX.
FLUE GAS

APPROX.
%CO2

TEMP °C

SERVICING
& SPARES

After service handover:

APPLIANCE

AIR

INPUT

SETTING

OUTPUT

Btu/hr

12/18 - Bentone Sterling 40 Burner:
0.35 80°SR

115

1.04 1.32

11.5

2.5

12.4

42300

40900

0.45 80°S

115

1.29 1.63

12.0

4.5

15.5

52900

51200

0.50 80°ES

140

1.55 1.96

12.5

5.25

18.6

63500

61400

18/25 - Bentone Sterling 50 Burner:
0.50 80°EH

130

1.56 1.98

11.5

4.25

18.6

63500

0.55 80°EH

145

1.86 2.36

12.0

6.0

22.2

75750 21.5

73400

0.65 80°EH

150

2.17 2.75

12.5

8.0

25.8

88000

85300

25/32 - Riello RDB Burner:
0.75 60°ES

105

2.15 2.72

11.5

3.0

25.5

87000 25

0.75 60°ES

140

2.45 3.1

12.0

4.0

29.1

99300 28.5

0.85 60°ES

150

2.75 3.48

12.5

5.0

32.7 111600 32

97200
109200

40
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

INSPECTION AND SERVICE

SHORT PARTS LIST 12/18
1

2
1 Burner - Sterling 40
Part Number: 8 716 112 507 0
2 Combustion head - burner
Part Number: 8 716 112 604 0
3 Control box Satronic DKO 970
Part Number: 8 716 142 396 0
4 Photocell Satronic MZ770s

Part Number: 8 716 156 692 0
5 Control box base Satronic S98 12 pole
Part Number: 8 716 142 782 0
6 Ignition electrode
Part Number: 8 716 156 683 0
7 Motor
Part Number: 8 716 156 645 0
8 Oil pump - Danfoss BFP 11 L3

Part Number: 8 716 142 736 0
8a Oil pump - Suntec AS47C
Part Number: 8 716 157 014 0
9 Transformer (Excludes cable)
Part Number: 8 716 156 696 0
10 Mechanical shut-off valve
Part Number: 8 716 156 658 0
11 Flexible oil line kit
Part Number: 8 716 106 346 0
12 Burner 'O' ring gasket
Part Number: 8 716 109 158 0
13 Heating control thermostat

Part Number: 8 716 107 621 0
14 Auto reset High Limit thermostat
Part Number: 8 716 107 640 0
15 Manual reset High Limit thermostat
Part Number: 8 716 107 625 0
16 Manual reset flue thermostat
Part Number: 8 716 107 624 0
17 DHW control thermostat
Part Number: 8 716 107 637 0

SERVICING
& SPARES

18 Cleaning brush
Part Number: 8 716 109 428 0
19 Manifold access cover seal
Part Number: 8 716 107 536 0

20 Secondary Heat Exchanger gasket
Part Number: 8 716 112 954 0
21 Frost thermostat
Part Number: 8 716 105 965 0
22 Service lead
Part Number: 8 716 113 483 0
23 Oil nozzle
0.35 80° SR (12kW output)
Part Number: 8 716 112 628 0
0.45 80° S (15kW output)
Part Number: 8 716 106 197 0

0.50 80° ES (18kW output)
Part Number: 8 716 156 669 0

41
SHORT PARTS LIST 12/18

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

SHORT PARTS LIST 18/25
1

2
1 Burner - Sterling 50
Part Number: 8 716 112 570 0
2 Combustion head - burner
Part Number: 8 716 108 573 0
3 Control box Satronic DKO 970
Part Number: 8 716 142 396 0
4 Photocell Satronic MZ770s

18 Cleaning brush
Part Number: 8 716 109 428 0
19 Manifold access cover seal
Part Number: 8 716 107 536 0

20 Secondary Heat Exchanger gasket
Part Number: 8 716 112 954 0
21 Frost thermostat
Part Number: 8 716 105 965 0
22 Service lead
Part Number: 8 716 113 483 0

SERVICING
& SPARES

17 DHW control thermostat
Part Number: 8 716 107 637 0

21 Oil nozzle
0.50 80° EH (18kW output)
Part Number: 8 716 156 672 0
0.55 80° EH (21.5kW output)
Part Number: 8 716 156 671 0

0.65 80° EH (25kW output)
Part Number: 8 716 110 362 0

42
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

SHORT PARTS LIST 18/25

SHORT PARTS LIST 25/32
3

4
1 Burner - Riello RDB 2.2 25/32 HE
Part Number: 8 716 112 512 0
2 Combustion head - burner
Part Number: 8 716 112 521 0
3 Control box 535 SE/LD
Part Number: 8 716 109 203 0
4 Photocell

Part Number: 8 716 109 193 0
5 Ignition electrode
Part Number: 8 716 109 183 0
6 Motor
Part Number: 8 716 109 186 0
7 Oil pump - Riello RDB
Part Number: 8 716 109 182 0
8 Flexible oil line kit

Part Number: 8 716 106 346 0
9 Burner 'O' ring gasket
Part Number: 8 716 109 158 0
10 Heating control thermostat
Part Number: 8 716 107 621 0
11 Auto reset High Limit thermostat
Part Number: 8 716 107 640 0
12 Manual reset High Limit thermostat
Part Number: 8 716 107 625 0
13 Manual reset flue thermostat
Part Number: 8 716 107 624 0
14 DHW control thermostat

Part Number: 8 716 107 637 0
15 Cleaning brush
Part Number: 8 716 109 428 0
16 Manifold access cover seal
Part Number: 8 716 107 536 0
17 Secondary Heat Exchanger gasket
Part Number: 8 716 112 954 0

SERVICING
& SPARES

18 Frost thermostat
Part Number: 8 716 105 965 0

19 Service lead
Part Number: 8 716 113 483 0
20 Oil nozzle
0.75 60° ES (25 & 28.5kW output)
Part Number: 8 716 106 156 0
0.85 60° ES (32kW output)
Part Number: 8 716 110 083 0

43
SHORT PARTS LIST 25/32

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

PROBLEM

CAUSE

REMEDY

Combustion settings incorrect

Set up as in installation instructions

Faulty nozzle

Replace nozzle

FAULT FINDING

LOCKOUT:
Pulsation on start

Intermittent lockout

Bad electrical connection

Check control box/electrical connections

Intermittent flame detection fault

See flame detection fault

Faulty motor or electrical supply
to motor

Check for 230v at motor plug during
startup period

Control box fault

Replace control box

Flame detection

Photocell filmed over (dirty)

Wipe clean

fault

Photocell faulty

Replace

Control box faulty

Replace

Burner motor fails to
operate

Incorrect CO2

No oil from nozzle

Air adjustment fault

Set up as in installation instructions

Oil pressure incorrect

Set up as in installation instructions

No oil at pump

Check and refill oil tank/bleed oil line

BOILER LOCKOUT :
Indicated by the illumination of the 'Lockout'
indicator on the fascia.
To reset, wait 2 minutes then press the lockout
reset button.
Also refer to fault finding logic on pages
46 and 47.

Check and clean filters & valves from oil
tank to boiler
Air in pump

Bleed pump

Nozzle blocked

Replace nozzle

Faulty pump or drive

Replace

Faulty mechanical shut off valve

Clean or replace

Ignition failure

Electrode settings incorrect

Set up as in installation instructions

Faulty ignition transformer

Replace

Open circuit ignition

Check and replace electrodes or high
tension leads if necessary

Faulty control box or electrical
connections not properly made

Correct control box electrical
connections or replace control box

BURNER FAILS

No power to boiler

Check electrical / control circuit

TO START

Faulty boiler thermostat

Check by temporarily linking out high
limit and control thermostats

Programmer open circuit

Check by temporarily linking 8 & 9 on
the connector

Faulty control box

Replace

HIGH SMOKE

Air intake/flue blocked

Check & clear air intake/flue

NUMBER

Incorrect combustion settings

Set up as in installation instructions

Oil pressure incorrect

Adjust to correct pressure

Incorrect components used on
combustion head

Check with installation instructions

Faulty nozzle

Replace nozzle

FAULT FINDING
& DIAGRAMS

(12/18 & 18/25 only)

UNDER NO CIRCUMSTANCES MUST AN
APPLIANCE BE LEFT TO OPERATE WITH
ANY CONTOL LINKED OUT OR
OVERRIDDEN.

44
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 106 252b (07/06

FAULT FINDING

PROBLEM

CAUSE

REMEDY

Pump noise from air in pump or
worn pump

Bleed air from pump or replace pump

Worn motor bearings

Replace motor

Fan out of balance

Replace fan

FAULT FINDING

FAULTY BOILER
OPERATION:
Noisy operation

Boiling

Short Cycling

Replace if necessary

Short circuit boiler thermostat

Take out of circuit to check

Thermostat bulb not fully home in
pocket

Ensure bulb is pushed fully home

No primary water circulation

Check system / circulating pump

Burner rating incorrect

Correct burner rating

Boiler thermostat differential
incorrect

Replace boiler thermostat

External controls not operating
correctly

Check and correct external controls

Blocked flue, fumes on startup

Check seals/gaskets

Oil soaked boiler, faulty burner
operation, numerous lockouts

Rectify burner operation and lockouts

Odour in cabinet, oil leaks from
pipework, flexible hoses
connections

Rectify oil leaks, replace components if
necessary

FAULT FINDING
& DIAGRAMS

OIL SMELLS:

Faulty boiler thermostat

45
FAULT FINDING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

Yes

Motor 40Ω

Check boiler
controls &
supply

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 106 252b (07/06

Yes

Replace
motor

Check
connections/
replace leads

Replace
motor/
pump

Replace
control box

Yes

Lockout
within 1
second?

Replace
pump

Replace oil
pump

Yes

Oil to
pump?

Drive
coupling
broken?

Pump
produces
pressure?
Yes

Replace
transformer

Yes

Electrodes
& leads
OK?

Yes

230V at
transformer?

Spark
produced?

Replace
lead

Yes

Photo cell
lead OK?

Yes

Replace
control box

Yes

Transformer
lead OK?

Lockout
after purge
before oil
solenoid
opens?

Yes

Disconnect photo cell,
reset lockout, burner
lights then locks out?

Yes

FAULT FINDING

FAULT FINDING
& DIAGRAMS

Note: This chart assumes all wiring within the control box base is correct, if in doubt check the wiring against the diagram on
the base of the control box before replacing any components.
All resistance measurements are actual measured values and some variation is to be expected, therefore measured values
should be similar to but not necessarily identical to the given values.
The operation of the photo cell can be tested by measuring the resistance across the photo cell, it should be a high resistance
(greater than 10MΩ or open circuit) in the dark and low resistance (15kΩ or less) in light.
Burners on balanced flue systems can recirculate flue products resulting in the burner cycling, if this happens check the flue
system integrity and the terminal position.

Replace
motor
capacitor

Yes

across
L & N?

230V at
motor?

L & N to
control box?

Motor or
pump
seized?

Burner
lights
immediately
motor runs?

Yes

230V at
solenoid coil
in purge?

Yes

Replace
control box

Control box
locks out?

Burner
motor runs?

Boiler not
operating
with a
heating /
hot water
demand

Replace
photo cell

Photo cell
functional?

If BF
remove
burner
snorkle tube
& retest.
Lights OK?

Yes

Flame off
and
re-lights?

Yes

Combustion
head set
correctly?

Yes

Combustion
air setting
correct?

Yes

Nozzle
atomising
fuel?

Replace
photo cell

Stray light
on photo
cell?

Yes

Replace
control box

Reseal BF
on
reposition

Boiler or
flue blocked

Reset
combustion
head

Reset air
setting

230V at
solenoid
coil?

Coil lead
OK?

Replace coil
lead

Replace
nozzle

Yes

Oil check
valve OK?
(if fitted)

Yes

Pipe to
nozzle
holder OK?

Yes

Solenoid
operating?

Yes

2.2kΩ
across
solenoid
coil?

Replace
control box

Replace oil
check valve
(if fitted)

Replace
pump

Replace
solenoid coil

Measure all 230V tests between
Neutral (N) and the pin, wire or
terminal specified.

Yes

These fault finding charts are provided to assist competent and suitably qualified engineers to
locate and rectify faults. Whilst every effort has been taken to ensure the information given is
correct and complete we cannot guarantee that every eventuality has been covered.
Worcester, Bosch Group cannot be held responsible for costs incurred by persons not deemed
to be competent.

FAULT FINDING LOGIC FOR

SATRONIC CONTROL BOX

FAULT FINDING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

Replace
photo cell

Replace
control box

Yes

Yes
Yes

Unblock or
replace pipe
No

Replace
control box

Replace
solenoid coil

Replace
motor

Replace oil
pump

Yes

Oil to pump?

Drive
coupling
broken?

Purge
pressure
1-2 bar?

Pump
produces
pressure?

Yes

Replace
solenoid coil

(100Ω)?

Solenoid coil
Yes
functional

Solenoid operating?
Increase the pump
pressure, pressure OK?

Replace
photo cell

Replace
control box

Photo cell
functional?

Remove
burner
snorkle tube
& retest.
Lights OK?

Yes

Flame off &
re-lights?

Yes

Combustion
head set
correctly?

Yes

Replace
pump stem
valve,
pressure
OK?

Yes

Coil lead
OK?

Combustion
air setting
correct?

Nozzle
atomising
fuel?
Yes

Reset air
setting

All resistance measurements are actual measured values and some variation is to be expected, therefore measured
values should be similar to but not necessarily identical to the given values.
The operation of the photo cell can be tested by measuring the resistance across the photo cell, it should be a high
resistance (greater than 10MΩ or open circuit) in the dark and low resistance (3kΩ or less) in light.
Burners on balanced flue systems can recirculate flue products resulting in the burner cycling, if this happens check the
flue system integrity and the terminal position.

Yes

Replace
motor

Photo cell
functional?

Motor 40Ω
between blue &
black wires ?

(100Ω)?

Yes

Replace
motor/pump

Yes

Solenoid coil
functional

Motor gives
50 Volts on
white wire?

Motor or
pump
seized?

Check boiler
controls &
supply

Lockout
after 12 sec
purge?

Ignition
spark
proved?

Lockout
within 1
second?

Yes

Eectrodes &
leads OK?

Yes

Yes
Pipe to
nozzle
holder OK?

Replace
nozzle

Replace
control box

Yes

Replace
control box

Replace
electrodes/
leads

Yes

L & N to
control box?

Burner
motor runs?

Boiler not
operating
with a
heating /
hot water
demand

FAULT FINDING
& DIAGRAMS

Yes

Replace
control box

Reseal BF

Boiler or flue
blocked

Reset
combustion
head

These fault finding charts are provided to assist competent and suitably qualified engineers
to locate and rectify faults. Whilst every effort has been taken to ensure the information
given is correct and complete we cannot guarantee that every eventuality has been
covered.
Worcester, Bosch Group cannot be held responsible for costs incurred by persons not
deemed to be competent.

FAULT FINDING LOGIC FOR

535 SE/LD RDB CONTROL BOX

MODE
SWITCH

SERVICE
CONNECTION

L N

MAINS
CONNECTION

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 106 252b (07/06

X1 (PIN 3)

ELECTRICAL SCHEMATIC

X4 (PIN 3)

brown

X2
(FS)

DHW

LINK
(REMOVE)

ROOM
THERMOSTAT

X2
(LS)

X2
(NS)

X2
(LR)

RELAY 1

grey

X8 (PIN 2)

white

X10 (PIN 1)

blue

X6 (PIN 4)

WATER FLOW
SWITCH

brown

X6 (PIN 2)

grey

R1 C1 N
X13 (PIN 5)

RELAY
4

X13 (PIN 2)

4
2

X8 (PIN 6)

X7 (PIN 4)

BURNER

MANUAL RESET FLUE
OVERHEAT THERMOSTAT

MANUAL RESET BOILER
OVERHEAT THERMOSTAT

AUTO RESET HIGH LIMIT
THERMOSTAT

CENTRAL HEATING
CONTROL THERMOSTAT

PLUG IN
CONNECTOR

red

grey

white

MOTORISED
DIVERTER
VALVE X8 (PIN 4)

PUMP

LOCKOUT
RESET SWITCH

brown

red

NC
red

orange

(C)

grey

orange

pink
2
4

NC
X13 (PIN 3) 2
1

yellow

X13 (PIN 1)

brown

X7 (PIN 3)

brown

X7 (PIN 1)

X8 (PIN 3)

white

X11 (PIN 3)
X12 (PIN 3)

LOCKOUT
INDICATOR

X12 (PIN 4)

R1
X3 (PIN 3 (L))

N RELAY 2

X11 (PIN 2)

DHW CONTROL RELAY
THERMOSTAT
3 N

white

X10 (PIN 3)

DIVERTER
END SWITCH

orange

X8 (PIN 5)

LIVE SUPPLY FOR ALTERNATIVE DIVERTER VALVE

X8 (PIN 1)

X3 (PIN 3)

X4 (PIN 2)

white

X4 (PIN 1)

grey

PROGRAMMER

X2 (FR)

FROST THERMOSTATS

X9 (PIN 2)

BOILER MODE
INDICATOR

FAULT FINDING
& DIAGRAMS

FUSE F1
3.15A
FAST
CERAMIC

X1 (PIN 1)

X9 (PIN 1)

X1 (PIN 6)

X1 (PIN 5)

ELECTRICAL SCHEMATIC

OIL BOILER COMBUSTION RECORD
BOILER MODEL
COMMISSIONING ENGINEER

SERIAL No.
COMBUSTION CHECKS

COMPANY NAME:

PUMP PRESSURE (PSI):

ADDRESS:

CO2 %:
SMOKE READING:

ENGINEERS NAME:
SIGNATURE:

F.G.T°C:
FLUE PRESSURE:

DATE:

BURNER MODEL:

FOR ALL BOILERS CONFIRM THE FOLLOWING
THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS

YES

OIL TYPE USED IS KEROSENE

YES

THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE INSTRUCTIONS?

YES

THE SYSTEM CLEANER USED:
THE INHIBITOR USED:

SERVICE INTERVAL RECORD It is recommended that the heating system is serviced regularly and
that you complete the appropriate Service Interval Record Overleaf.
Service Provider. Before completing the appropriate Service Interval Record overleaf, please ensure you have carried out the
service as described in this manual. Always use Worcester, Bosch Group specified spare parts when replacing all controls.

SERVICE 1 DATE

SERVICE 2 DATE

ENGINEER NAME
COMPANY NAME
TEL No.
OFTEC REG No.
PUMP PRESSURE:
NOZZLE CHANGED?
F.G.T. °C
COMMENTS

psi
CO2%:
YES
NO
FLUE PRESSURE:

SIGNATURE

SERVICE 3 DATE

SERVICE 4 DATE

ENGINEER NAME
COMPANY NAME
TEL No.
OFTEC REG No.
PUMP PRESSURE:
NOZZLE CHANGED?
F.G.T. °C
COMMENTS

psi
CO2%:
YES
NO
FLUE PRESSURE:

SIGNATURE

SERVICE 5 DATE

SERVICE 6 DATE

ENGINEER NAME
COMPANY NAME
TEL No.
OFTEC REG No.
PUMP PRESSURE:
NOZZLE CHANGED?
F.G.T. °C
COMMENTS

psi
CO2%:
YES
NO
FLUE PRESSURE:

SIGNATURE

SERVICE 7 DATE

SERVICE 8 DATE

ENGINEER NAME
COMPANY NAME
TEL No.
OFTEC REG No.
PUMP PRESSURE:
NOZZLE CHANGED?
F.G.T. °C
COMMENTS

psi
CO2%:
YES
NO
FLUE PRESSURE:

SIGNATURE

SERVICE 9 DATE

SERVICE 10 DATE

ENGINEER NAME
COMPANY NAME
TEL No.
OFTEC REG No.
PUMP PRESSURE:
NOZZLE CHANGED?
F.G.T. °C
COMMENTS

SIGNATURE

psi
CO2%:
YES
NO
FLUE PRESSURE:

SIGNATURE

psi
CO2%:
YES
NO
FLUE PRESSURE:

In the unlikely event the boiler does not give
complete satisfaction, before calling for a
service engineer, the installer should check
the following:General checks
1. Is the mode switch in boiler mode (indicator on)?
2. Is there 230V across the boiler live and neutral terminals?
3. Is the polarity correct? (230V across live and earth, 0V across neutral and earth)
4. Is the air bled from the primary system?
5. Is the air bled from the oil supply?
6. Is the flue sized and routed correctly?

Boiler runs straight to lockout
1. Has the oil line been purged of air?
2. Where an air eliminator is used in conjunction with a top feed oil tank
the non-return valve, (if fitted), should be removed from the oil dip pipe.

Boiler locks out at the start of a demand
(Heating off overnight for example)
1. If an air eliminator is being used, check that there are no leaks that allow
air to be pulled into the oil supply.
2. If a two pipe oil supply is a being used, has a non-return valve
been fitted to the inlet pipe? Refer to the instructions for guidelines.

No domestic hot water (external programmer)
1. Is the mains water in connected to the 15mm isolation valve?
2. Is there a domestic hot water demand from the programmer and has the
tank reached temperature?
3. Is there 230V on pin 2 of terminal block X4?
4. Remove the external wiring from terminal block X4 and fit a link across 1
and 2, if the domestic hot water now operates there is a problem with
the external programmer and/or its wiring.

No central heating (external programmer)
1. Are both programmer and room thermostat on demand for central heating?
2. Is the room thermostat wired correctly?
3. Refit the link across pins LS and LR on terminal X2, if the central heating
now operates correctly the room thermostat and/or its wiring are faulty.
4. Is there 230V on pin 1 of terminal block X4?
5. Remove the external wiring to terminal block X4 and fit a link across
pins 1 and 3 on terminal X4, if the central heating now operates correctly
the room programmer and/or its wiring are faulty.

CONTACT INFORMATION
WORCESTER, BOSCH GROUP:
TECHNICAL:
08705 266241
SERVICE:
SPARES:

08457 256206
01905 752571

LITERATURE:
TRAINING:

01905 752556
01905 752526

SALES:
WEBSITE:

01905 752640
www.worcester-bosch.co.uk

WATER TREATMENT:
FERNOX
01799 550811
www.fernox.com
SENTINEL

0151 420 9595

www.betzdearborn.com/sentinel
FLUE TERMINAL GUARD:
PART No. 7 716 190 050

UNDER NO CIRCUMSTANCES MUST AN APPLIANCE BE LEFT
TO OPERATE WITH ANY CONTROL LINKED OUT OR OVER RIDDEN.

EXCELLENCE COMES AS STANDARD
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 01905 754624 Fax. 01905 754619
Worcester, Bosch Group is a trading name of BBT
Thermotechnology UK Ltd.

www.worcester-bosch.co.uk
8 716 113 389b (09/07)

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Boschhome 18 Dec Users Manual

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