Trianco EuroStar Combi 20 User guide

OPERATION, INSTALLATION,
COMMISSIONING AND SERVICING
INSTRUCTIONS
Please read these instructions carefully before installing,
Commissioning and using this appliance.
To be retained by the householder.
TRIANCO COMBI 15/20 & 20/26 BAND A
For Balanced or Conventional Flue

2
CONTENTS
PAGE
HEALTH AND SAFETY INFORMATION
3
HOW TO USE YOUR BOILER
4
Boiler and System Control
4
Oil
4
Simple Fault Finding
4
Commissioning and Servicing
4
AFTER SALES SERVICE INFORMATION
6
TECHNICAL INFORMATION
7
Outline Dimensions
8
Technical Data
9
Pump Curve
10
Wiring Diagram
11
INSTALLATION
12
Regulations
12
Health and Safety
12
Siting the Boiler
12
Combustion Air Conventional Flue
13
Ventilation for Conventional Flue Boiler
14
Water Systems
14
Water Systems Connection
15
Programmer Instructions
18-19
Electrical Supply
19
Condensate Drain Connections
20
OIL STORAGE TANK
21
Supply
21
Storage and Protection
22
FLUE SYSTEMS
23
Conventional Chimneys
23
Balanced Flues
23-33
COMMISSIONING
34
Procedure
34
Handing Over
34
SERVICING
34
Oil Tanks
35
Line Filters
35
Boiler
35-36
FAULT FINDING
37-38
SPARES
39
Casing Assembly
40
Control Box Assembly
41
Boiler
42
Pipe work
43

3
HEALTH AND SAFETY
INFRORMATION FOR THE USER, INSTALLER AND SERVICE ENGINEER
Under the Consumer Protection Act 1987 and the Health and Safety at Work Act 1974, it is a requirement to
provide information on substances hazardous to health (COSHH Regulations 1998).
TR Engineering takes every reasonable care to ensure that its products are designed and constructed to meet
these safety requirements when the products are properly installed and used. To fulfil the requirements, products
are comprehensively tested and examined before despatch.
When working on the appliance, it is the responsibility of the user or engineer to ensure that personal protective
clothing or equipment appropriate to parts that could be considered hazardous or harmful is worn.
This appliance may contain some of the items below:
Insulation and seals
Glass rope, mineral wool, insulation pads, ceramic fibre and glass insulation.
When handling, avoid inhalation and contact with eyes. These may be harmful and cause irritation to the skin,
eyes, nose or throat. Use disposable gloves, facemasks and eye protection.
After handling, wash hands and other exposed areas. When disposing of materials, limit dust and the risk of
inhalation by using water spray. Ensure materials are securely wrapped.
Seek urgent medical attention if inhaled or ingested. Exposure to eyes and skin should be followed by immediate
cleansing of the affected areas and medical attention if necessary.
Glues, Sealants and Paints.
The glues, sealants and paints used present no known hazards when the appliance is used in the manner for
which it is intended.
Minerals Oils.
The appliance is designed to run on 28 sec. Kerosene class C2. The effects of mineral oils on the skin will vary
depending on the length of exposure.
Avoid any skin contact with oil or clothing contaminated with oil. Kerosene will remove the protective grease
normally present on the surface of the skin, rendering it dry, liable to cracking and more prone to damage caused
by cuts and abrasions. Seek immediate medical attention for any rash, wart or sore that develops on any part of the
body.
Barrier cream that contains lanolin, such as Rosalex Antisolv is recommended together with a strict regime of
personal cleaning.
Do not breathe oil vapours. Do not fire the burner in the open (i.e. out of the boiler), as a misfire will produce
unburned oil vapours. Under no circumstances should minerals be taken internally.

4
HOW TO USE YOUR BOILER
The EuroStar Band A Combi is a heat storage
combination boiler, which stores heat to supply hot
water whenever the hot taps are turned on.
It is recommended that the boiler is switched to come
on 30 minutes before you need hot water or central
heating as this will allow time for the hot water store to
reach the selected working temperature.
The boiler is fully automatic once switched on and the
water store is up to working temperature.
TEMPERATURE CONTROL
Your EuroStar boiler is fitted with two adjustable
temperature control thermostats to regulate the
temperature of the domestic hot water and central
heating.
The hot water thermostat can be run at the ‘ECO’ end
of the scale during summer months or when high
water demand is not required.
During periods of high water demand the hot water
thermostat can be adjusted into the ‘HIGH’ range to
give higher water temperature.
Experience will tell you which is the most economical
setting to suit your household.
If you live in a hard water area it is recommended that
in order to reduce scale formation on the plate heat
exchanger that the hot water thermostat is only set in
the ‘ECO’ range. To prevent scale from forming a salt-
based water softener must be fitted where the
temporary hardness is above 150ppm or 10.5° Clarke.
BEFORE FIRING THE BOILER
Ensure the system is full of water and vented of all air,
there is sufficient oil in the storage tank and all valves
are open.
1. Switch on the electrical supply.
2. Select required position on hot water thermostat
(check that programmer is on).
3. Select required position on central heating
thermostat.
4. Set the room thermostat (if fitted) calling for heat.
5. The burner heating the boiler operates
automatically cutting in and out according to the
heating and hot water.

5
SYSTEM CONTROLS
ROOM THERMOSTAT
The room thermostat should not be positioned near a
source of heat such as a radiator or exposed to the
sun, as this will cause the central heating to switch off
before the room is up to temperature. Follow the
manufacturer’s instructions for best siting position for
the thermostat.
FROST PROTECTION
If the boiler and central heating is shut down for many
hours during very cold weather, the water may be in
danger of freezing and, as such, it is advisable to
protect the installation with a frost thermostat.
Where the system is not protected, the boiler should
be left switched on and the room thermostat set to a
low setting e.g. 7°C (45°F) to prevent the building
temperature falling too low.
If the system is shut down for a long period during
very cold weather, it is advisable to completely drain
the system. However, frequent draining should be
avoided, especially in hard water areas, as this could
lead to scaling of the boiler waterways.
OIL
The recommended oil for you boiler is 28 sec
Kerosene (BS 2869: Class C2).
OIL TANK
Always ensure the tank is topped up at regular
intervals, do not wait until the tank is nearly empty
before refilling, otherwise sludge and water could be
sucked into the oil pipe to affect the burner’s operation
and reduce pump life.
After a delivery of oil, it is recommended that the oil is
allowed to settle in the tank for about half an hour
before restarting the burner.
Sludge and water caused by condensation should be
drawn off at the drain cock annually.
SIMPLE FAULT FINDING
NOTE: Before removing any components or insulation
please read the advice on Health and Safety in the
insulation and servicing instructions.
If the burner fails to start for no apparent reason,
make the following checks before calling your service
engineer.
1. Check for failure in the electrical supply, e.g. a
power cut.
2. Check for a blown fuse. If the fuse has blown and
on replacement blows again, switch off the mains
electrical supply to the boiler and call your service
engineer.
3. Check that there is adequate oil in the tank and
the shut off valve is open.
4. Check for burner lock out. Press the reset button
and the burner should fire. DO NOT PRESS
MORE THAN TWICE. Refer to Burner lock out for
further advice.
5. Check for excess water temperature (Refer to
high limit thermostat for advice).
SERVICING
To ensure efficient and reliable operation of the boiler,
it is essential that the oil burner is initially
commissioned by an OFTEC trained and registered
engineer and an annual service is given thereafter.
NOTE:
ELECTRICAL SAFETY CHECKS SHOULD BE
CARRIED OUT BY A QUALIFIED ELECTRICAL
ENGINEER.
a. It is the responsibility of the installer to ensure
proper commissioning is carried out.
b. It is a requirement of the boiler’s guarantee and
any extended warranty that an annual service is
carried out by a qualified engineer.
Commissioning Engineer
Signature:
Company Name:
Address:
Tel No:
HARD WATER AREAS
If you live in a hard water area, a device for preventing
scale formation should be installed, such as a
softener. And regularly checked for effective
operation.

6
A qualified field service engineer is available to attend
a breakdown occurring during the boiler’s guarantee
period.
The boiler must be made available for attendance
during normal working hours, Monday to Friday.
How to report a fault.
Step 1
Contact your installation or service engineer, who
should assess the unit and works carried out on the
appliance prior to requesting the attendance of an
engineer from TR Engineering.
Step 2
Please note that upon attendance by an engineer,
a charge will be made where:
The engineer finds no fault with the boiler.
The cause of the breakdown is due to parts of the
system not supplied by the manufacturer.
The cause of the breakdown is due to incorrectly fitted
spare parts, or third-party spares not designed for use
with the boiler.
The appliance has not been installed and
commissioned by a qualified engineer as described in
these instructions.
The stove has not been serviced annually since
installation.
The breakdown occurs outside the guarantee period.
The appliance has not been maintained correctly.
The breakdown occurs due to use of the appliance not
sanctioned by these instructions.
The breakdown occurs as a result of work on the
appliance by an unauthorised third party.
IMPORTANT
Invoices for attendance and repair work by any
third party will not be accepted unless authorised
in advance by TR Engineering Ltd.
Technical Assistance
A team of trained technical advisors is available to
discuss any problem with the appliance. In many
cases, the problem may be solved over the telephone,
eliminating the need for an engineer’s visit.
Before making contact, please have the following
information ready:
1. The appliance serial number or your unique
customer identification number (issued upon
registration of the appliance). The serial number is
located on the flue access cover.
2. A description of the fault and any unusual
behaviour by the appliance before the failure
occurred.
3. The installation and commissioning dates, and the
details of any annual services.
Important note:
As a replaceable item, burner nozzles are only
guaranteed until the first service.
Over 50% of all service calls are found to have no
appliance fault.
AFTER SALES SERVICE INFORMATION
Appliance Serial No:
Customer ID No.:
Installation Date: ___/___/______
Service Centre and Technical Support
Tel: [phone] Fax: [phone]
Hours of Business
Monday –Thursday: 8:30am –17:00pm
Friday: 8:30am –14:30pm

7
INSTALLATION
IRN 101 –Byelaw 25
Water supplies shall be at reasonably balanced
pressures from a common source (either from storage
or from a supply pipe). Where the fitting is installed in
domestic premises, supplies may be taken from
separate sources provided a Listed single check
valve or some other no less effective back flow
prevention device is fitted immediately upstream of
both hot and cold water inlets.
IRN 116 –Byelaws 90 and 91
Sealed primary circuits and/or secondary hot water
systems shall incorporate a means for
accommodating the thermal expansion of water to
prevent any discharge from the circuit and/or system
except in an emergency situation.
IRN 302 –Byelaw 14
Unvented primary circuits may be filled or replenished
by means of a temporary connection between the
circuit and a supply pipe provided a listed double
check valve or some other no less effective back flow
prevention device is permanently connected at the
inlet to the circuit and the temporary connection is
removed after use.
INTRODUCTION
The Trianco EuroStar Combi Boiler has been
designed to conform to European Directive/Standards
BED 92/42/EEC, LVD 73/23/EEC, EMC 89/336/EEC.
The boiler design incorporates a secondary stainless
steel heat exchanger to recover heat from the flue
gases that is normally lost in conventional oil fired
boilers.
The matched pressure-jet burner is quiet in operation
and ensures clean and efficient combustion, with low
NOx emissions.
The boiler is suitable for all-normal open-vented
central heating and indirect hot water systems. With
the appropriate safety equipment, the boiler can also
be used with sealed systems up to a working pressure
of 3 bar.
Two flow and return sockets are provided to facilitate
connections to the heating and hot water circuits.
Due to the high efficiency of the boiler, and to comply
with the Building Regulations (Part L), it must be fitted
to fully pumped systems only.
The front-mounted access cover permits easy access
for removal of the baffles and cleaning of the heating
surfaces. If the boiler is installed under a kitchen
worktop, this should be made removable to give
easier access to the flue gas sample point and
condensate cleaning port (see page 28).
The only heating oil suitable for use on this boiler is
kerosene class C2. DO NOT use any other heating oil
or a mixture of heating oils. Failure to use the correct
oil will invalidate the warranty.
Flues
The boilers are supplied suitably equipped for
connection to a conventional chimney, but when
installed with a TR Engineering balanced flue kit it
becomes a room-sealed appliance. These kits allow
the boiler to be installed in a wide variety of site
conditions. The balanced flue is available in
horizontal, high level horizontal and vertical formats.
All flues are suitable for installation in garages, and
conform to the requirements of OFSA100. See pages
17-26 for balanced flue options.
Note: The low level balanced flue kit can only be used
for rear and right-hand side exhaust.
Flushing and water treatment
The performance of the boiler could be impaired by
system debris or the effects of corrosion. New
systems must be thoroughly flushed to remove metal
filings, solder, machining oils and any other corrosive
fluxes or greases before connecting the boiler.
When fitting the boiler to an existing system, clean the
system by using an appropriate flushing and descaling
agent. Refer to BS 7593 (1992) for guidance.
The system must be protected with a corrosion
inhibitor. Flushing agents and corrosion inhibitors
must be suitable for use with mild steel boilers and
comply with BS 7593 requirements. It is strongly
recommended that a suitable anti-freeze product is
applied to the system after flushing.
Failure to flush the system and add a corrosion
inhibitor may reduce the life span of the boiler and will
invalidate the guarantee and any extended warranty.
Failure to fit the boiler to a fully pumped system will
impede its correct operation and invalidate the
guarantee and any extended warranty.
The boiler must not be run without water in the
system.
It is the installation engineer's responsibility to ensure
that the boiler's output matches the heat requirements
of the system. Failure to do so may impede the
boiler's correct operation and invalidate its guarantee
and any extended warranty.

8
OUTLINE DIMENSIONS AND CLEARANCES
SPACE REQUIRED FOR INSTALLATION AND MAINTENANCE
Rear
0 mm
0 in
Side LH/RH
20 mm
0.75 in
Front
600 mm
24 in
Top
450 mm
18 in
THE BOILER MAY BE INSTALLED BELOW A KITCHEN WORK SURFACE
SO LONG AS THE SECTION IS REMOVABLE AND THE MAINTENANCE
CLEARANCE IS MAINTAINED.
CLEARANCE UNDER WORK SURFACE 5mm MINIMUM.

9
TECHNICAL DATA
COMBI 20
COMBI 26
Rated Input
22.1 kW
28.3 kW
Rated Output
20.5 kW
26.3 kW
Oil Burner
Riello RDB
Riello RDB
Weight (empty)
147 kg
147 kg
Water Content
82.3 litres
82.3 litres
C/H Flow and Return
22mm
DHW Inlet & Outlet
15mm
Maximum Operating Pressure
3 Bar –43.5psi
Test Pressure
4.5 Bar –65.3 psi
Water Side Resistance 10°C diff.
64 mbar
85 mbar
Water Side Resistance 20°C diff.
22 mbar
22.5 mbar
Control Thermostat
Ranco ODD Type K36
Overheat Thermostat
Ranco LM 7 (Manual Reset)
Tank Control Thermostat
Ranco ODD Type K36
Tank Economy Thermostat
Ranco ODD Type K36
DHW Thermostat
Ranco ODD Type K36
Tank Overheat Thermostat
Ranco LM 7 (Manual Reset)
Electricity supply
230V –50Hz Fused at 5A
Pump
Grundfos
Priority Valve
Danfoss Randall HS A3ND
Expansion Vessel
Zilmet 10Ltr charge 0.5mba
Pressure Gauge
0 –4 Bar
Flow Switch
Sika
Pressure Relief Valve
3 Bar
Max. Flow Temp. C/H
75°C
Flow Rate DHW @ 1.5 BAR
-
20 litres
Flow Rate DHW @ 1.5 BAR
17 litres
-
Total DHW Draw Off
100 litres
Available Head System
3m –9.75ft
Flue Gas Temperature
71.5°C
71.5°C
Required Flue Draught
12.5mm –0.05in
Fuel
28 sec Kerosene BS 2869 Class C2
Flue Gas Mass Flow Rates
Starting Current
5.5 amp
Running Current
1.2 amp
Flue Dia.
100mm –4 in

10
Grundfos 25/60 (Eurostar Combi 20 and Combi 26)
PUMP FLOW CURVE
Note
If the pump is run on speed setting 1, domestic hot
water availability is impaired.

11
Note: When fitting a room Thermostat, remove link wire ‘A’ and wire the thermostat into terminals ‘T’ and ‘H’

12
INSTALLATION
Regulations
Installation of the boiler must comply with the
following:
BS 5410 Part 1: Code of Practice for Oil Firing.
BS 5449: Forced Circulation Hot Water Central
Heating Systems.
Building Regulations Part J (England and Wales), Part
F section 111 (Scotland), Part L.
Control of Pollution (Oil) Regulations
IEE Regulations (BS 7671).
Local water Undertakings Bylaws.
OFTEC Requirements for oil fired Boilers and Oil
Storage tanks, OFST 100 & OFST 200.
Health and Safety at Work
The installation engineer should be aware of his or her
responsibilities under the Act and provide where
necessary appropriate protection for all persons
carrying out the installation.
In the interests of safety, the boiler must only be
installed, commissioned and serviced by a qualified
engineer, preferably OFTEC-trained and registered. A
guide to safe working practices for oil engineers is
available from OFTEC.
Electrical work should be carried out in accordance
with BS 7671 by a qualified electrical engineer.
Siting the Boiler
Sound Levels
While the low sound level of the boiler makes it
suitable for utility room or kitchen installation, the
following factors should be taken into consideration
before installation:
a) Some people are particularly sensitive to noise
levels than others –discuss with the householder.
b) Small rooms tend to amplify noise, particularly if
the room’s construction is hollow or the surface is
tiled.
c) A chimney passing through a bedroom will
transmit noise.
d) Low level flue terminals produce some exhaust
noise, so care should be taken when siting
adjacent to neighbouring properties, patios and
play areas.
Pluming
Due to the condensing nature of the boiler, a plume of
water vapour will occasionally discharge from the flue;
this should be taken into account when siting the
terminal. Refer to pages 16–17 for details.
Clearance and service access
Ensure adequate clearance is allowed for making the
water and flue connections (Fig 3). If the boiler is
installed under a kitchen worktop, this should be made
removable to give access to the flue gas sample point
and condensate cleaning port (page 28). About
750mm should be left at the front of the boiler for
service access.
Hearth
The boiler must be installed on a level, non-
combustible base that is capable of supporting the
installed weight of the boiler, including its water
content.
Combustion and Ventilation Air
The provision of an adequate combustion air supply is
essential for the safe and efficient operation of the
boiler. The air opening should be positioned to cause
the least possible nuisance to the end user, and
located in a place that will reduce its likelihood of
being accidentally blocked.
As per BS 5410 Part 1 (Code of Practice for Oil), for
conventionally flued boilers a permanent opening of
550mm2per kW of boiler rated output above 5kW is
required (see table below and Fig 5).
Although no combustion air openings are required for
balanced flue boilers, ventilation is required to prevent
overheating of the boiler controls if installed in a
compartment or other confined space (see Fig 6).
If the boiler room has an extractor fan, the combustion
performance of the boiler must not be affected when
the fan is running and all doors and windows are
closed. A flue gas analysis on the smoke and CO2
levels should be carried out to prove that combustion
is taking place satisfactorily.
Output (kW)
Detail 'A' (fig 5 & fig 6)
20
83cm2
26
115cm2

13
Fig. 5 Conventional Flue
Fig. 6 Balanced Flue

14
WATER SYSTEMS
Heating
The installation must comply with the requirements of
BS 6798 and BS 5499. Maximum water temperature
is 86°C. The appliance is supplied with two stop
valves (flow and return) terminating in compression
connections (22mm). The appliance also incorporates
the following components:
Pump On the return to the boiler
Expansion Vessel 10ltrs, pre-charged to 0.5 Bar
Pressure Relief Valve Set to operate at 3 Bar
A system schematic is given in Fig. * and *.
Drain cock
Drain cock(s) should be fitted at the lowest point in the
system to enable the water to be drained. A drain is
fitted to the front lower section of the storage tank.
Expansion Vessel Requirements
The boiler is supplied with a 10 litre expansion vessel,
capable of accepting the 82 litre stored water
expansion at a cold fill of up to 1 Bar.
An additional expansion vessel must be fitted if a
system water volume exceeds 42 litres not including
boiler or if the initial system pressure is above 0.75
Bar.
For systems having a larger capacity, multiply the total
water content (boiler and system) by the factor to
obtain vessel size in litres.
Additional Expansion Vessel Requirement
Bar
Bar
Bar
Vessel Charge and Initial
System Pressure
0.5
1.0
1.5
Multiplication Factor to Give
Total Expansion Vessel
Volume
0.08
0.11
0.16
Example
A system to be filled to 1 Bar cold fill (vessel to be
charged 1 Bar) has 82 litres of stored water and 60
litres of water in the central heating system, requires a
total expansion vessel of:
82 + 60 = 142 litres
Multiply by factor 0.11 (from chart)
= 15.62 litres = total expansion volume
Expansion vessel supplied = 10 litres
We therefore need 15.62 –10 = 5.62 of extra
expansion.
An additional vessel of at least 5.62 litres would
therefore be required to be fitted.
Note: if the appliance pressure gauge indicates a rise
of pressure to 2.6 Bar or higher with the radiator
circuit operating at full output of the boiler, an
additional expansion will be required in the system.
System Filling
The appliance is designed for connection to sealed
central heating water systems Fig. * shows a typical
system design.
A sealed system must only be fitted by a competent
person using one of the approved methods shown in
Fig. * or * (A or B). The system should incorporate the
connections appropriate to one of these methods.
Method of Makeup
Water loss from the system should be replaced from a
makeup vessel connected to the system through a
non-return valve on the return side of the heating
circuit. This vessel should be higher than the top of
the system.
Alternatively provision for makeup can be made by
pre-pressurisation of the system via a temporary hose
connection and through a double check valve (non-
return) and stop valve.
Filling
There shall be no direct connection to the mains water
supply, even through a non-return valve, without the
approval of the local water authority.
System Cleaning and Inhibitor Treatment
It is essential to clean the installation in accordance
with the procedure set out in BS 7593. This involves
the application of a cleanser, and allowing it to
circulate around the whole system for a specified time,
then flushing to drain. It is important to select the
cleanser appropriate to the situation i.e. for a new
installation or for an existing system where the boiler
is being replaced. In the case of boiler replacement, it
is good practice to clean the system prior to the
installation of the new boiler.
It is recommended that an inhibitor be added to
protect the system. The inhibitor should be added at
the time of the final fill, in accordance with the
manufacturer’s instructions.

15
Domestic Hot Water
The mains supply pressure should be between 1 and
5 Bar, but if in excess of 5 Bar, then a pressure
reducing valve must be fitted before the inlet valve.
The final 600mm (24in) of the mains water supply pipe
to the boiler must be copper. If the appliance is
installed in an area where the temporary hardness of
the water supply is high, say over 150ppm. A water
softener (salt based) must be fitted. Consult the Local
Water Authority if in doubt.
For specific information relating to fittings (e.g.
showers, washing machines, etc) suitable connection
in the DHW circuit, consult the local water authority if
in doubt.
Domestic Hot/Cold Water Supply Taps and Mixing
Taps
All equipment designed for use at mains is suitable.
Showers and Bidets
Any mains pressure shower or bidet complying with
the Local Water Authority bylaws is suitable.
Water System Connections
Heating
Connect the appliance to the water system using the
two stop valves supplied (copper compression fittings
22mm). The flow connection is on the right. Using not
less than 15mm copper pipe work, the pressure relief
must be piped to the tundish, in accordance with
details given in Fig ** and section G3 of the Building
Regulations 1991 approved document.
NOTE: Failure to ensure the correct vessel size could
result in premature failure of the expansion vessel,
which in turn may adversely affect other components
on the boiler i.e. circulating pump and diverter valve.
Domestic Hot Water
Connect the incoming cold water using the ball valve
supplied (copper compression fitting 15mm).
Connect the DHW flow to the hot water system
(copper compression fitting 15mm).
EUROSTAR COMBI SCHEMATIC LAYOUT CENTRAL HEATING MODE
EUROSTAR COMBI SCHEMATIC LAYOUT DOMESTIC HOT WATER MODE

16
SEALED SYSTEM PIPING SCHEMATIC DIAGRAM
ALTERNATIVE METHODS OF FILLING A SEALED SYSTEM

17
TYPICAL DISCHARGE PIPE ARRANGEMENT

18
Factory Fitted Electronic Programmer
The unit is fitted with a twin channel 7 day
programmer, to control the heating and hot water.
Programming Sequence

19
.

20
Electrical Supply
All electrical wiring must be carried out by a qualified
electrician in accordance with current IEE Regulations
and any local regulations that apply.
The boiler must be earthed and the supply cables
must be longer than the current-carrying conductor
cables (i.e. live and neutral supply cables). The
minimum requirement for the power supply is PVC
sheathed flexible cord, 0.75mm² (24x0.2mm, code
designation H05 VV-F or H05 VVH2-F), as specified
in table 16 of BS 6500.
The 230V, 50Hz electrical supply must be fused via a
double-pole switch—with contact separation of at
least 3mm in both sides, and via a shuttered socket
adjacent to the boiler (both devices must meet the
requirements of BS 1363).
All external cables entering the control box must be
secured in position through use of the strain-relief
bushes (supplied, see Fig 7).
In certain areas, there may be a known risk of high
and low voltage fluctuations, though use of a voltage
sensitive device, the burner should be prevented from
starting if the voltage drops or rises to a level sufficient
to endanger the installation.
FIXING OF STRAIN RELIEF BUSHES