Glow-worm FIRELITE 4 BBU, CONTOUR 4 BBU, MIAMI 4 BBU Instructions For Use Installation And Servicing

Hepworth Heating Ltd.,

Nottingham Road, Belper, Derbyshire. DE56 1JT

General/Sales enquiries:

Tel: [phone] Fax: [phone]

One Contact Local Service

Customer Services:

Tel: [phone]

Fax: [phone]

221904D.04.02

All replacement parts

All labour charges

All call-out charges

Thank you for installing a new Glow-worm appliance in your home.

Glow-worm appliances' are manufactured to the very highest standard so we are pleased

to offer our customers' a Comprehensive First Year Guarantee.

In the centre pages are to be found your Guarantee Registration Card, which we recommend you complete and

return as soon as possible.

If this card is missing you can obtain a copy or record your registration by telephoning the Heatcall Customer

Service number 01773 828100.

Our Guarantee gives you peace of mind plus valuable protection against breakdown by covering the cost of:

Guarantee Registration

FIRE FRONT G.C. No. 37-047-13

This is a Cat I2H Appliance

Reference in these instructions to British Standards and Statutory

Regulations/Requirements apply only to the United Kingdom.

For Ireland the rules in force must be used.

The instructions consist of three parts, User, Installation and Servicing Instructions, which includes the Guarantee Registration

Card. The instructions are an integral part of the appliance and must, to comply with the current issue of the Gas Safety

(Installation and Use) Regulations, be handed to the user on completion of the installation.

To be left with the user

❏

✔

❏

✔

❏

✔

Instructions for Use

Installation & Servicing

REGISTER YOUR GLOW-WORM APPLIANCE

FOR 1ST YEAR GUARANTEE PROTECTION

CALL 0208 247 9857

9513

FIRELITE 4 BBU

CONTOUR 4 BBU

FIRE FRONT G.C. No. 37-047-14

MIAMI 4 BBU

TEAK FIRE FRONT G.C. No. 37-047-15

FOR USE WITH BBU 45/4 & BBU 54/4

9475

9446

MAHOGANY FIRE FRONT G.C. No. 37-047-20

2221904D

Important Information

Safety 3
Introduction 3
Maintenance/Servicing/Cleaning 3
Operating your Boiler & Fire 4
Lighting the Boiler & Fire 5
Replacement Parts 6

General Data 1 7/8
Types of Installation 2 8/9
Flue and Ventillation 3 9
Fire Front Preperation 4 9
Installation 5 11/12
Controls & Pressure Checks 6 13
Spillage Check 7 14
Final Review 8 14

Servicing and Replacement of Parts 9 15
Fault Finding 10 17
Spare Parts 11 19

CONTENTS DESCRIPTION SECTION PAGE No.

INSTRUCTIONS

FOR USE

INSTALLATION

INSTRUCTIONS

Certification

This fire is certificated to the current issue of BS6332 part 2, invoking the current issue of BS5258 part 5 for safety and performance.
It is, therfore, important that no alteration is made to the fire, without permission, in writing, from Hepworth Heating Ltd.

Any alteration that is not approved by Hepworth Heating Ltd., could invalidate the certification, the warranty and could infringe the
statutory requirements.

CE Mark

The CE mark on this appliance shows compliance with:

1. Directive 90/396/EEC on the approximation of the laws of the Member States relating to appliances burning gaseous fuels.

2. Directive 73/23/EEC on the harmonization of the Laws of the Member States relating to electrical equipment designed for use
within certain voltage limits.

INFORMATION FOR THE INSTALLER AND SERVICE ENGINEER.

Under Section 6 of the Health and Safety at Work Act 1974, we are required to provide information on substances hazardous to health.

The Adhesives and sealants used in this appliance are cured and give no known hazard in this state.

RADIANTS

After handling wash hands thoroughly.

INSULATION PADS/CERAMIC FIBRE, GLASSYARN, SEALANT

These can cause irritation to skin, eyes and the respiratory tract.

If you have a history of skin complaint you may be susceptible to irritation. High dust levels are usual only if the material is broken.

Normal handling should not cause discomfort, but follow normal good hygiene and wash your hands before eating, drinking or
going to the lavatory.

If you do suffer irritation to the eyes or severe irritation to the skin seek medical attention.

SERVICING

REMEMBER, When replacing a part on this appliance, use only spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised by Hepworth
Heating Ltd.

SERVICING

INSTRUCTIONS

3

221904D

Instructions for Use

Notes and General Information

These instructions should be read and carefully followed for the
safe and economical use of your appliance.

These gas fire fronts are to be used with specially designed
Glow-worm 45/4 & 54/4 Back Boiler Units only.

The fire front and back boiler must be installed as a complete
unit.

The boiler and fire can be operated together or independently.

Important Notice

This appliance is for use on natural gas (G20) as distributed in
the United Kingdom and Ireland and must not be used on any
other gas.

A slight smell may occur for a short time after initial lighting, this
is quite normal and with use it will quickly disappear.

Combustible furniture or materials must not be placed closer
than 1m (39in) in front of the fire front.

Soft wall coverings(e.g. embossed vinyl, etc.) which have a
raised pattern, are easily affected by heat. They may, therefore,
scorch or become discoloured when close to a heating appliance.
Please bear this in mind whenever you are considering
redecorating

The convection air openings at the top of the fire front and air
inlet grilles at the sides and base must never be restricted.

Never use the fire with damaged radiants.

The Gas Safety (Installation and Use)
Regulations

In your interests and that of safety it is the Law that ALL gas
appliances are installed by a competent person in accordance
with the current issue of the above regulations.

Dress Guard

The dress guard on this fire front satisfies the current issue of
Heating Appliances, Fireguards, Regulations and conforms to
the current issue of BS1945.

The guard is to prevent risk of injury from burns and should be
replaced immediately after removal for cleaning.

This guard does not give full protection for the young, elderly or
infirm. In such cases fit an approved guard which complies with
the current issue of BS6539 "Fireguards and the use with Solid
Fuel Appliances" or the current issue of BS6778 "Fireguards
with portable, free standing or wall mounted appliances".

Maintenance

To ensure the continued efficient and safe operation of the
appliance it is recommended that it is checked and serviced as
necessary at regular intervals. The frequency of servicing will
depend upon the particular installation and usage, but in general
once a year should be enough.

If this appliance is installed in a rented property there is a duty
of care imposed on the owner of the property by the current
issue of the Gas Safety (Installation and Use) Regulations,
Section 35.

It is the law that servicing must be carried out by a competent
person.

Please be advised that the ‘Benchmark’ logbook (supplied with
the Back Boiler Unit) should be completed by the installation
engineer on completion of commissioning and servicing.

All CORGI Registered Installers carry a CORGI ID card, and
have a registration number. Both should be recorded in your
boiler Logbook. You can check your installer is CORGI registered
by calling CORGI direct on :- 01256 372300.

Servicing

In the United Kingdom servicing can be carried out either by a
Heatcall Service engineer or a CORGI registered installer.

If you require your appliance to be serviced, please contact
Heatcall on [phone] and quote the following details;

Model name and Serial numbers.
Fire front-positioned bottom right inside of the case.

Back Boiler-positioned on the base of the boiler next to the
control box

If you wish to replace any radiants and do not know where they
can be obtained please contact Hepworth Heating on (01773)
824141 or your nearest stockist.

In the United Kingdom, for general advice about gas and your
gas fire contact Hepworth Heating Ltd.

Electrical Supply

WARNING. The appliance must be earthed.

Connection of the appliance and any system controls to the
mains (230V-50Hz) must be through a 3A fused double pole
isolating switch, having a minimum double pole contact
separation of 3mm, serving only the boiler and system controls.

The colours of three core flexible cable are, Brown - live, Blue

- neutral, Green and Yellow - earth.

Cleaning

Turn the fire off and allow it to cool before attempting any
cleaning.

Normally the fire will only need dusting. The bright metal trims
may be cleaned with a damp cloth and dried with a soft duster.

Obstinate marks can be removed from the guard and trims
using soapy water. Never use abrasive cleaners.

The radiants can be cleaned with a soft brush - see diagram 7,8
& 9 which shows how to remove the dressguard and radiants.

Frost

If the boiler is to be out of use for any long time during severe
weather conditions we recommend that the whole of the system,
including the boiler be drained off to avoid the risk of freezing up.

If fitted, switch off the immersion heater in the domestic hot
water cylinder.

If you are in any doubt your installation or servicing company or
the local gas undertaking should be contacted.

IF YOU SMELL GAS

DON'T SMOKE.

EXTINGUISH ALL NAKED FLAMES.

DON'T TURN ELECTRICAL SWITCHES

ON OR OFF.

TURN OFF THE GAS SUPPLY AT THE METER.

OPEN DOORS AND WINDOWS TO GET

RID OF THE GAS.

IMMEDIATELY CALL THE GAS EMERGENCY

SERVICE.

Advice/help should be obtained from your installation/

servicing company or the local gas undertaking.

4221904D

Diagram 3

9460

Diagram 4

CONTROL
THERMISTOR
KNOB 'A'

Instructions for Use

Clearance

A shelf or surround of a maximum depth of 150mm may be
fitted, provided that clearances above and at the sides of the fire
front are as shown in diagram 1. For a shelf made from wood or
other combustible materials deeper than 150mm add 12.5mm
for every 25mm of shelf depth over 150mm.

On no account must a carpet or other combustible material be
laid directly under the fire, unless the minimum clearances
shown in diagram 2, is achieved.

The dimension is taken from the bottom of the fire case to the
top of the carpet pile or other floor covering.

Hearth

A fire proof hearth under the fire front must have the minimum
dimensions as shown in diagram 3.

Diagram 2

9458

RESET
POSITION

RESET NEON
(RED)

BURNER ON
NEON (GREEN)

710mm

300mm

50mm

13mm NON-COMBUSTIBLE

MATERIAL

CARPET OR COMBUSTIBLE
MATERIAL CLEARANCE

Diagram 1

9459

75mm

75mm

FROM NON-COMBUSTIBLE MATERIAL

150mm

50mm

MIAMI ILLUSTRATED

MINIMUM HEARTH DIMENSIONS

9918

BOILER USER CONTROL

MINIMUM

MAXIMUM

OPERATING YOUR BOILER AND FIRE

Safety Device

BOILER

- This appliance is fitted with a flue blockage safety
device which will shut down the appliance in the event of
abnormal flue conditions. This device is NOT a substitute for an
independently mounted Carbon Monoxide detector.

FIRE FRONT

- The fire is fitted with a safety device which will
shut it down if there is a lack of oxygen it also incorporates a
probe which senses that the heat from the pilot flame is correct.
If the probe is cool, the device will prevent any gas flow unless
the control knob is held down at the ignition position.

If, for any reason, the flames go out when the fire is hot or if the
fire is turned off when hot, always wait at least three minutes
before attempting to relight.

If the boiler and/or fire shuts down frequently for no apparent
reason the first things to be checked are the chimney and air
inlets into the room.

Any problems found must be put right, by a competent person,
before the appliance is used again.

50mm

5

221904D

Lighting the boiler

The boiler control is situated at the bottom of the R/H louvre of
the fire front.

Refer to diagram 4 to identify the boiler control.

See that all other controls are calling for heat.

The clock, room thermostat and programmer, if fitted, will
probably be some distance from the unit.

To see how these items work and need to be set, read the
manufacturers instructions supplied with them.

Turn the control thermistor knob “A” so that the pointer is
between maximum and minimum, "O" on the boiler user
control, see diagram 4.

Switch on electrical supply to the back boiler.

There will be a purge for approximately 30 seconds.

NOTE: If the electrical supply is switched rapidly off and on
without gas present the control will purge for 100 sec. Neither
of the indicators will be lit. The appliance will then operate
correctly.

The boiler will automatically light.

This is indicated by a green light on the boiler user control
coming on, see diagram 4.

Note: Should the red light on the boiler user control come on,
it indicates that the pilot light is not operating correctly, or the
flue blockage safety device has been activated.

When the fault has been corrected, turn the control thermistor
knob “A” fully anti-clockwise so that the pointer is against the
“Reset” position on the boiler user control panel,

see diagram 4.

NO ATTEMPT SHOULD BE MADE TO RELIGHT THE BOILER
UNTIL ANY FAULT HAS BEEN CORRECTED. EXPERT
ADVICE SHOULD BE SOUGHT.

Adjust the control thermistor knob to the required setting
between the minimum, "O" and maximum position.

Maximum is approximately 82

o

C.

The temperature of the hot water cylinder should be periodically
raised to 60oC.

Check that all external controls are also set to your requirements.

If the burner goes out for no apparent reason it is IMPORTANT
that the advice given under “Safety Device” is followed.

To turn the boiler off

For short periods, turn the control thermistor knob “A” fully anti­clockwise so that the pointer is against the “Reset” position on
the boiler user control, see diagram 4.

To relight the main burner turn control thermistor knob “A”
clockwise to the desired setting between the minimum, "O" and
maximum position.

For longer periods, turn the control thermistor knob “A” to
“Reset” position. Switch off the electrical supply to the boiler.

To relight follow the full lighting instructions given above.

Lighting the fire

Please note

When operating your fire for the first time, some vapours may
be given off which may cause a slight odour and could possibly
set off any smoke alarms in the immediate vicinity. These
vapours are quite normal with new appliances. They are totally
harmless and will disappear after a few hours.

To light the fire

The control is shown in diagram 5.

Depress the control knob and turn anticlockwise towards the 1/
IGN position, two audible clicks will be heard. A spark should
be generated at the pilot while turning. The spark should ignite
the pilot. The pilot flame can be seen through the opening
immediately below the centre radiant, see diagram 6.

If the pilot does not light, turn the knob back to OFF and try
again.

In the unlikely event of failure of the ignition mechanism the pilot
can be lit with a long match or taper.

When the pilot has lit keep the knob depressed for about ten
seconds to allow the flame sensing probe to warm up.

The control knob can then be set to your preferred heat level.
The settings are:

Knob Radiants Condition
Position

2 Centre radiant on low. Outer radiants off.

3 Centre radiant fully on. Outer radiants off.

4 Centre radiant fully on. Outer radiants on low.

5 All radiants fully on.

To turn off partially depress the knob and turn clockwise to off.
Wait at least three minutes before attempting to relight.

Diagram 6

9422

Diagram 5

9481

Instructions for Use

MIAMI ILLUSTRATED

MIAMI ILLUSTRATED

6221904D

Lighting with a match or taper

Depress the control knob and turn anticlockwise towards the
1/IGN position.

While keeping the knob depressed, light the pilot by inserting a
long match or taper into the pilot viewing opening
(See diagram 6 ).

When the pilot is alight, keep the knob depressed for about ten
seconds to allow the flame sensing probe to warm up before
setting to your preferred heat level.

For your own convenience, have the fire serviced as soon as
possible.

To Turn Off

Push gas tap knob in and fully clockwise to "Off".

Replacing the radiants

Turn the fire off and allow it to cool before attempting to remove
the radiants.

For Miami remove the dress guard by holding the outer edge
and flexing the centre outwards to release the upper and lower
locating pins, see diagram 7.

For Firelite & Contour remove the dress guard by pressing down
the two hooks at the top. Tilt the guard forward and lift out, see
diagram 7.

Lift the centre radiant from the bottom and withdraw forwards,
move the other radiants to the centre and remove in a similar
way, see diagram 8.

To replace, insert top of radiant first, then the bottom and lower
into position, see diagram 9.

Replace the dress guard.

It is suggested that the position of the radiants be changed from
time to time.

Replacement Parts

If replacement parts are required apply to your local supplier.

Please quote the name of the appliance and Part No. required.

Diagram 7

Diagram 9

0723

RADIANTS TO
TOUCH REAR RIB

Instructions for Use

1678

Diagram 8

To exchange a radiant first ensure the fire is cold and
remove dressguard.
Lift up the radiant at the bottom and withdraw forward.

9426

MIAMI

FIRELITE & CONTOUR

LOCATION PINS

9401

7

221904D

1 General

General Notes and Information

These gas fire fronts are to be used with specially designed
Glow-worm 45/4 & 54/4 Back Boiler Units only.

The fire front and back boiler are NOT suitable for fitting to a
precast flue.

The fire front is delivered packed in one cardboard carton, which
contains all the parts necessary for the installation of the fire
front.

If the back boiler and fire front are to be installed at the same
time please read both sets of instructions before starting.

Wherever possible, all materials, appliances and components
to be used shall comply with the requirements of applicable
British Standards.

Where no British Standards exist, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.

1.1 Important Notice

This fire front is for use only on G20 gas.

The fire is fitted with a safety device which will shut it down if
there is a lack of oxygen it also incorporates a probe which
senses that the heat from the pilot flame is correct. If the probe
is cool, the device will prevent any gas flow unless the control
knob is held down at the ignition position.

If, for any reason, the flames go out when the fire is hot or if the
fire is turned off when hot, always wait at least three minutes
before attempting to relight.

If the fire shuts down frequently for no apparent reason the first
things to be checked are the chimney and air inlets into the
room. Any problems found must be put right, by a competent
person, before the appliance is used again.

Any problems found must be put right, by a competent person,
before it is used again.

This appliance does not contain any component manufactured
from asbestos or asbestos related products.

Diagram 1.1

686mm

248mm

620mm

250mm

9449

617mm

248mm

625mm

633mm

638mm

MIAMI 4 BBU FIRE FRONT

FIRELITE 4 BBU FIRE FRONT

CONTOUR 4 BBU FIRE FRONT

OVERALL DIMENSIONS

8221904D

1 General

Sheet Metal Parts

WARNING. When installing or servicing this fire front care
should be taken when handling sheet metal parts (components)
to avoid any possibility of personal injury.

1.2 Data

Gas Pressure - 20mbar

Gas connection - 8mm pipe from BBU gas service cock

Total weight - Miami 4 19.4kg

Firelite 4 16.8kg
Contour 4 18.9kg

Injectors

Upper
(Centre Radiant) Bray Cat. 28/120

Lower
(Outer Radiant) Bray Cat. 28/250B

Burner Test
Pressure (Cold) 17.2mbar (6.91in wg)

Nett Heat input

Max. 5.05kW (17,230Btu/h)

Min 1.14kW (3,800Btu/h)

Pilot & Atmosphere
Sensing Device OP9093

Ignition Piezo-electric integral with gas tap

Aeration Non-adjustable

Data label LH Side lower corner on the inner

face of back panel

1.3 Statutory Requirements

The installation must be in accordance with these instructions.

For the user’s protection, in the United Kingdom it is the law that
all gas appliances are installed by competent persons in
accordance with the current edition of the Gas Safety (Installation
and Use) Regulations. Failure to install the appliance correctly
could lead to prosecution. The Council for the Registration of
Gas Installers (CORGI) requires its members to work to
recognised standards.

In the United Kingdom the installation must also be in accordance
with:

Diagram 2.1

5506

2 Types of Installation

C

L

800mm

Firelight/Contour 690mm

REMOVE COMBUSTIBLE
MATERIAL FROM THIS AREA

BUILDERS

OPENING

INSTALLATION

CENTRE LINE

PREPARED BASE

2.1 With Hearth

A fireproof hearth under the fire front must have the minimum
dimensions as shown in diagram 3 Instructions for Use.

2.2 With Surround

The fire front casing should cover the opening.

Any combustible material on the fire front wall face area of the
surround must be removed, see diagram 2.1. This area, to the
depth removed, should then be rendered with a sand/cement
mixture.

Miami 780mm

All the relevant parts of local regulations.

All relevant codes of practice.

The relevant parts of the current editions of the following British
Standards:-

BS 715, BS EN 1806 , BS 5440 Part 2
BS 6891, BS 1251, BS 4543 Part 2
BS 5871 Part 1, BS 1289 Part 1, BS 5440 Part 1, BS 6461 Part 1
In England and Wales, the current edition of the Building

Regulations issued by the Department of the Environment and
the Welsh Office

In Scotland, the current edition of the Building Standards
(Scotland) Regulations issued by the Scottish Executive.

In Northern Ireland, the current edition of the Building regulations
(Northern Ireland) issued by the Department of the Environment
for Northern Ireland.

In the republic of Ireland the installation must also conform to
the relevant parts of:

a) The current edition of IS 813
b) All relevant national and local rules in force.

1.4 Fire Front Location

This fire front can only be fitted to a specially designed Glow­worm 45/4 & 54/4 Back Boiler Units, which itself has been
installed in accordance with the Glow-worm Installation and
Servicing Instructions.

The back boiler must have been correctly positioned in the
builder’s opening as the fire front is located by connection to the
back boiler.

The back boiler draught diverter and combustion chamber
extension acts as a support for the fire front.

The fire front flue spigot projects into the back boiler draught
diverter assembly.

The gas supply is taken from the back boiler service cock.

1.5 Clearances

Restrictions should not be placed around the assembled fire
front, see diagram 1 Instructions for Use. A shelf up to 150mm
deep may be fitted above, with a minimum space of 100mm
between the top of the fire front and the underside of the shelf,
see diagram 1 Instructions for Use.

There should be a clearance of at least 1 metre from any part
of the radiant heating surface to any combustible side wall or
fixture.

9

221904D

3 Flue and Ventilation

2.3 Without Surround or Hearth

The minimum clearances for shelves or projections on the fire
front wall face are as shown in diagram 1, (Instructions for Use).

The front opening in the fire front wall face should not be greater
than 580mm wide.

Any combustible material on the fire front wall face area must be
removed, see diagram 2.1. This area, to the depth removed,
should be rendered with sand/cement mixture.

On no account must a carpet or other combustible material be
laid directly under the fire, unless the minimum clearances
shown in diagram 2 Instructions for Use, is achieved.

The dimension is taken from the bottom of the fire front to the top
of the carpet pile or other floor covering.

4 Fire Front Preparation

Diagram 4.2

Diagram 4.3

9471

GAS FIRE
FEED PIPE

UNION
NUT

GAS FIRE
SUPPLY
COCK

SECURING
SCREW (2)

9447

MIAMI ILLUSTRATED

GAS FIRE
SUPPLY
COCK

CAP

WASHER

RESTRICTOR

SCREW

GAS
SERVICE COCK

Diagram 4.1

9637

TRANSIT
SCREW
EACH SIDE

2 Types of Installation

3.1 Refer to the current issue of BS5440 Part 1.

4.1 Unpacking

This appliance is supplied completely assembled except for :

3 radiants which are in a cardboard pack inside the firebox.

Literature pack.

Fittings pack.

Gas feed pipe and fittings.

Remove all the items carefully to prevent damage. Some items
may be contained in the packaging fitments - Examine the
packaging carefully before discarding. Check that all the items
are present and undamaged.

MIAMI only:

Remove the wood transit strips, secured with

panel pins, from bottom of the wooden case sides.

4.2 Appliance Preparation

Remove the two transit screws from near the top of the back
panel wing, see diagram 4.1.

Take care not to damage the rear surround side louvres when
placing the fire front on its back, remove the two case retaining
screws located at the front of the case near the bottom corners,
see diagram 4.2.

Remove the control knob by pulling clear of the gas tap spindle.

Ease the bottom of the casing upwards and away to disengage
the upper lugs, withdraw from the chassis.

Place casing aside, on its back, until required.

Remove the radiant pack and place carefully on one side until
required.

The back boiler draught diverter assembly accepts the fire front
flue spigot.

Note. Provision must be made during the installation of the back
boiler for the total ventilation requirement for the combined
appliance. See relevant section in the Back Boiler Installation
Instructions.

10221904D

Diagram 4.6

4.3 Gas Supply to Fire Front

Check that the gas service cock is in the Off position, diagram

4.3.

NOTE: The gas fire feed pipe will need cutting at the plain end
at a point depending upon the position of the BBU relative to the
fire front wall face.

From the fittings pack, fit the union nut to the flanged end of the
gas fire feed pipe.

Connect the gas fire feed pipe assembly to the gas fire supply
cock, see diagram 4.3.

The gas fire feed pipe must project from the fire front wall face,
121 mm, see diagram 4.4. Measure and cut to suit.

From the fittings pack, fit the gas fire isolating valve to the cut
end of the gas fire feed pipe, ensuring it is positioned correctly,
using an olive and nut, see diagram 4.5.

When fitted check that the gas fire feed pipe, where it projects
from the fire front wall face, is level and the centre of the feed
pipe is 77 mm above the back boiler base plate.

Tighten connections.

Make sure that the gas fire isolating valve is in the Off position
by removing cap and turning restrictor screw clockwise, see
diagram 4.5.

Turn the gas service cock to the On position.

Turn the gas fire supply cock to the On position by removing cap
and turning restrictor screw anti-clockwise, see diagram 4.3.

Pressure check the installation pipework for gas soundness. In
the United Kingdom check in accordance with the current
edition of BS6891. In the Republic of Ireland check in accordance
with the rules in force.

4.4 Check ignition spark

Before attempting to install, it is worth checking that the piezo
electric spark ignition system operates satisfactorily.

To initiate the spark, temporarily refit the control knob to the tap
spindle. Depress the control knob and while keeping it depressed,
turn to the 1/IGN position. A spark should track from the
electrode pin to the thermocouple tip. If there is no spark or
incorrect tracking, check that the spark gap is between the
electrode wire and thermocouple tip, see diagram 4.6.

If the spark gap is correct, check the ignition wiring.

Remove the control knob after checking.

9464

3.00mm-5.0mm GAP

4 Fire Front Preparation

Diagram 4.4

9638

121mm

77mm

FIRE FRONT
WALL DATUM

FIRE FRONT
WALL FACE

GAS FIRE
FEED PIPE

Diagram 4.5

9639

FIRE
ISOLATING
VALVE

CAP

WASHER

RESTRICTOR

SCREW

11

221904D

Diagram 5.2

COMBUSTION
CHAMBER
EXTENSION

9472

SECURING
SCREWS (2)

ADJUSTMENT
SCREWS (2)

FIRE FRONT
WALL FACE

FIRE
FRONT
WALL
FACE

43mm

FIRE LOWER
SUPPORT
BRACKETS (2)

9473

FIRE FRONT
WALL FACE

Diagram 5.1

9469

FIRE FRONT
WALL FACE

DRAUGHT
DIVERTER

DRAUGHT
DIVERTER BODY

SCREWS (2)

FIRE SUPPORT
BRACKETS (2)

ADJUSTMENT
SCREWS (2)

FIRE
SUPPORT
BRACKET

ADJUSTMENT
SCREWS (2)

62mm

5.1 Fire Front Fixing

Slide the draught diverter, supplied with the boiler, into the
draught diverter body on the BBU and secure with two 5mm dog
point screws, see diagram 5.1.

Fit the two upper fire support brackets on to the draught diverter
with two dog points screws each and adjust so that the end of
each bracket extends about 62mm from wall face, see diagram

5.1.

Check that the measurement between the centres of the fire
securing holes on the brackets is 238mm and adjust accordingly,
ensuring that the brackets are as near to 90o as possible from
the wall face, tighten the dog point screws.

Note. The Boiler User Control is supplied coiled and taped onto
the controls, remove tape and uncoil, carefully place to the right
hand side of boiler.

Take the combustion chamber extension, supplied with the
back boiler, and fit the lower fire support brackets with two dog
point screws on each but do not tighten.

Fit the combustion chamber extension on the two BBU
combustion chamber front screws and secure, see diagram 5.2.

Note: If the mains electrical supply cable is routed from the right,
secure it with a cable clip, from fittings pack, to the combustion
chamber extension, see diagram 5.2.

Adjust the two lower support brackets so that the end of each
bracket extends about 43 mm from the fire front wall face, see
diagram 5.2.

Lift the fire chassis and position the spigot centrally into the back
boiler unit draught diverter assembly, gently slide the chassis
into place.

Note: It may be necessary to temporally remove the floor
protection plate, see diagram 5.4 to ease installation and fitting
of gas fire feed pipe to fire.

Secure fire chassis to the fire support brackets using the
M5x20mm dog point screws, see diagram 5.3.

5 Installation

MAINS
CABLE CLIP
POSITION

12221904D

5 Installation

5.2 Gas Supply Connection

Connect and tighten the union nut at the fire front isolating valve,
see diagram 5.4.

Refit floor protection plate if removed.

Turn gas on at the fire isolating valve by removing cap and
turning restrictor screw anti-clockwise.

Pressure check the installation pipework for gas soundness. In
the United Kingdom check in accordance with the current
edition of BS6891. In the Republic of Ireland check in accordance
with the rules in force.

5.3 Boiler User Control

Place the boiler user control in position from the inside to the
aperture on the bottom of the R/H louvre of the fire chassis,
making sure that it is the correct way up, see diagram 5.5.

Secure from the outside to the louvre with the screws, from
fittings pack, see diagram 5.5.

5.4 Radiants Installation

Remove radiants from packaging and fit as described in
"Replacing Radiants" in the Instructions for Use section of these
instructions.

Diagram 5.3

DOG POINT SCREWS

9474

Diagram 5.5

UNION
NUT

GAS FIRE
FEED PIPE

Diagram 5.4

9480

SECURING
SCREWS (2)

DOG POINT
SCREW (2)

TOP FIXING

BOTTOM FIXING

9478

FIRE
ISOLATING
VALVE

BOILER USER
CONTROL

LOUVRE
ASSEMBLY

LOUVRE
ASSEMBLY

FLOOR
PROTECTION
PLATE

13

221904D

6 Control & Pressure Checks

GAS TAP

PRESSURE
TEST POINT

Diagram 6.1

9477

6.1 Check Control Settings

If closed, open the fire isolating valve.

To check the control positions temporarily place the case
loosely over the chassis. Fit the control knob over the gas tap
spindle.

Depress the control knob and turn anticlockwise partially towards
the 1/IGN position until some resistance is felt. Keep depressed
at this position for a few seconds to purge air from the system
then, while keeping it depressed, turn fully to the 1/IGN position,
two audible clicks will be heard. A spark should be generated at
the pilot while turning. The spark should ignite the pilot.

When pilot ignition has been achieved, keep the control knob
depressed for approximately ten seconds to allow the
thermocouple probe to warm up and then release it. If the pilot
does not remain alight, ensure that the air has been purged, that
the pilot orifice is clear and that the thermocouple connections
are sound. Replace the pilot unit if necessary (see servicing
section of this manual).

Check all the control settings. These are:

Knob Radiants Condition
Position

2 Centre radiant on low. Outer radiants off.

3 Centre radiant fully on. Outer radiants off.

4 Centre radiant fully on. Outer radiants on low.

5 All radiants fully on.

6.2 Flame Supervision Device

The pilot unit incorporates a system which will automatically
shut off the gas supply if the pilot flame goes out or if there is
insufficient oxygen due to spillage or lack of ventilation.

Check that the system operates properly as follows;

Light the appliance. Set at position 5 and leave for one minute.

Turn back to “OFF” to extinguish the pilot. Note the time when
the pilot goes out. Listen for a snap sound at the gas tap. Note
the time when the sound is heard. This sound is caused by an
electromagnetic valve shutting off the gas supply through the
tap. The valve is located in the body of the tap. The valve should
operate within 60 seconds of the pilot going out. If the valve does
not operate within this time limit do not allow the appliance to be
used until the fault has been corrected.

6.3 Flue Blockage Safety Device

This monitoring system must not be adjusted, bypassed or put
out of operation.

This monitoring system, or any of its parts, must only be
exchanged using Glow-worm authorised parts.

6.4 Check Reference Pressure

The appliance is pre-set to give the correct heat input at the inlet
pressure shown in section 1 of this manual. No adjustment is
necessary.

Detach the control knob from the spindle. Remove the case.

Check the burner pressure by fitting a pressure gauge at the test
point. The test point is on the gas tap, see diagram 6.1. Check
the pressure with the appliance alight and set at maximum
output (Control position 5).

After checking, turn off the appliance. Remove the pressure
gauge and replace the test point sealing screw. Relight the
appliance. Turn to the maximum output position and test around
the sealing screw for gas soundness with a suitable leak
detection fluid.

If all the above checks are satisfactory, continue with the
installation. If not, check the control and ignition circuitry and
components as described in the servicing section of this manual.

6.5 Case Fitting

Remove the protective wood transit strips (secured with panel
pins) from the bottom of the wooden case sides.

Place the case over the chassis. Make sure that the channel
near the top of the rear of the outer case locates fully into the
wings of the chassis back panel, see diagram 6.2.

Fit the control knob firmly on to the control spindle.

Refit the two case retaining screws at the front of the case near
the bottom corners.

Diagram 6.2

9476

BACK PANEL
WING (2)

CHASSIS
BACK PANEL

14221904D

9499

Diagram 7.1

7.1 Spillage Check

Note:

1. Take care. The appliance gets hot during testing.

2. To carry out the test you will need a 500mm emplume

tube and a torch.
TEST: WHERE NO FAN IS PRESENT
Close all outside doors and doors and windows in the room in

which the appliance is installed.
Light the fire front only. After 5 minutes apply spillage test.

Position the smoke match tip under the fire front flue duct on the
draught diverter lip by inserting the emplume tube 380mm
through the side louvres, see diagram 7.1. During test smoke
should be drawn into the draught diverter and between the fire
front flue duct and the draught diverter lip. If spillage occurs
leave fire front alight for up to a further 10 minutes and repeat
tests.

Next, light the boiler only and after 10 minutes apply spillage test
by positioning smoke match tip as described above, and shown
in diagram 7.1. If spillage occurs, leave the boiler alight for up
to a further 5 minutes and repeat test.

Now light the boiler and fire front. After 10 minutes apply
spillage tests by positioning smoke match tip as described
above, and shown in diagram 7.1. During tests smoke should
be drawn into the boiler draught diverter. If spillage occurs,
leave the boiler and fire front alight for up to a further 5 minutes
and repeat tests.

Note: If spillage does occur smoke will be visible exiting the top
of the fire casing.

TEST. WHERE A FAN IS PRESENT
(A fan means an extractor fan, or a fan for other open flued

appliances, or a circulating fan for a warm air unit, whether or not
gas fired). With the fan switched off carry out the appropriate
spillage test with all doors and windows closed, as above.

If the above tests are satisfactory continue as follows,
Open all doors connecting the room containing the appliance

and the room in which the fan is fitted. Close all other doors and
windows in the premises.

If the fan is in the same room as the appliance close all doors
and windows in that room. Switch on fan and repeat spillage
test as above.

In ALL cases, if spillage continues after the specified test
periods steps MUST be taken to put right the fault(s).

Possible causes include, flue obstructions, down draught or
restricted fresh air supply into the room.

7 Spillage Check

Please ensure the “Benchmark” logbook (supplied with Back
Boiler Unit) is completed and left with the user.

Make sure that the dress guard is securely in position.
Check the operation of the fire at all control positions.
Visually inspect the appliance. Clean off any marks incurred

during installation.
Advise the customer how to operate the fire and boiler.
Explain to the customer that the appliance has a flame failure

and spillage monitoring system. Point out the explanation of this
system in the "Instructions for Use". Advise that if the appliance
goes out for any reason, they must wait at least three minutes
before relighting. Stress that if the monitoring system repeatedly
shuts off the appliance that it must be switched off and their local
installation or service organisation must be contacted or the
local gas undertaking contacted.

Advise that the fire may give off a slight odour while new. This
is quite normal and it will disappear after a short period of use.

EMPLUME
TUBE

DRAUGHT
DIVERTER LIP

SMOKE
MATCH
TIP

380mm

VIEW ON ARROW 'A'

(FIRE REMOVED FOR CLARITY)

FIRE FRONT
FLUE DUCT

A

MIAMI ILLUSTRATED

Advise the customer that they should read the Instructions for
Use before operating the fire and always follow the advice in the
section headed "Cleaning your fire".

Advise the user that the appliance can be lit with a match if
necessary by inserting it through the central opening at the
bottom of the radiant box.

Recommend that the appliance should be serviced and the
chimney inspected by a competent person (In the UK a CORGI
registered person) at least annually.

If the appliance is in premises in the United Kingdom occupied
by a tenant, point out that by law a landlord must have any gas
appliance, flue and pipework which is situated in a tenant’s
premises checked for safety at least every 12 months.

Mention that the radiants may become brown with use, that this
is quite normal and has no adverse effect and that they can be
replaced without removing the case, refer "Instructions for
Use", replacing radiants section.

Reminder- leave these instructions and the “Benchmark” logbook
with the user.

8 Final Review

15

221904D

9 Servicing and Replacement of Parts

Replacement of Parts Notes

REMEMBER: When replacing a part on this appliance, use only
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised
by Hepworth Heating Ltd.

9.2 Radiants

Refer "Instructions for Use" section, replacing radiants.

9.3 Pilot Unit

Remove the case as section 9.1.

Disconnect the thermocouple connection at the bottom of the
gas tap and disconnect the pilot pipe from the gas tap, see
diagram 9.2.

Remove the first securing the dust cage to the pilot unit & burner
bracket and carefully remove the dust cage and place aside,
see diagram 9.1.

Remove the screw securing the pilot unit to the burner bracket.

Disconnect the electrode lead from below the pilot electrode,
see diagram 9.1.

Carefully remove the pilot unit together with the pilot pipe then
disconnect the pipe from the pilot unit.

Replace in the reverse order.

Note:

1. The pilot unit must be replaced as a whole assembly.

Its individual components are not separately replaceable.

2. Once removed, ensure that the dust cage is cleaned
before refitting. Make sure that it locates squarely onto the
pilot unit without any gaps between the cage edges and
the pilot unit.

Servicing Notes

MAKE SURE FIRE FRONT IS COLD.

Servicing must be carried out by a competent person.

After completing a service, always test for gas soundness and
carry out functional check of controls.

Unless stated otherwise all parts are replaced in the reverse
order to removal.

Always turn off the gas supply at the fire isolating valve, refer
diagram 5.4.

NOTE: It is recommended that the back boiler be serviced
before refitting the fire front case and radiants, refer to Back
Boiler Installation Instructions.

9.1 Servicing

Remove the control knob by pulling clear of the gas tap spindle.

Remove two case retaining screws located at the front of the
case near the bottom corners.

Lift the case up and forward to clear the rear top location.

When refitting make sure that the channel near the top of the
rear of the outer case locates fully into the wings of the chassis
back panel, see diagram 6.2 in the installation section.

Make sure that the radiants are not dislodged when refitting the
case.

Remove the radiants, Refer "Instructions for Use".

Clean all around the fire front chassis with a soft brush or
vacuum cleaner.

Check the condition of the electrode, thermocouple and dust
cage, clean with a soft brush, see diagram 9.1.

Make sure that the electrode spark gap is as shown in diagram

4.6.

Clean injectors as necessary, but, Do not clean injectors with a
wire or sharp instrument.

Clean the burner with a soft brush, or vacuum cleaner.

NOTE: It is recommended that the back boiler be serviced , refer
to Back Boiler Installation Instructions.

Diagram 9.1

9503

SECURING
SCREW (2)

PILOT UNIT

ELECTRODE
LEAD

DUST CAGE

16221904D

9 Servicing and Replacement of Parts

Diagram 9.3

9504

9.4 To Remove the Piezo Generator

Remove the case as section 9.1.

Disconnect the electrode lead from below the pilot electrode,
see diagram 9.1.

Disconnect the control spindle & adapter from the gas tap by
removing the split pin, see diagram 9.2. Lift the adapter clear of
the gas tap spindle.

Remove the circlip holding the piezo generator to the tap , see
diagram 9.2.

Replace in the reverse order. Make sure that the control knob
with spindle is correctly turned to agree with the gas tap position
before refitting the split pin.

9.5 To Remove The Complete Burner Module,
Pipes and Pilot

Remove the case as section 9.1.

Support the inlet isolating elbow to avoid straining the pipework
and disconnect the appliance from the elbow.

Disconnect the control spindle & adapter from the gas tap by
removing the split pin, see diagram 9.1. Lift the adapter clear of
the gas tap spindle.

Detach the left end of the burner module from the radiant box by
removing one screw, see diagram 9.3.

Carefully slide the burner module to the right to free it from the
right side of the radiant box.

Remove the pipes, gas tap or injectors as required.

Replace in the reverse order.

Take care when replacing the injectors. The injectors have
ceramic tips at each end. It is important not to allow jointing
compound to get on either end of the injectors.

Make sure that the control knob with spindle is correctly turned
to agree with the gas tap position before refitting the split pin.

RETAINING
SCREW

BURNER
MODULE

BURNER
MODULE

BURNER MODULE
RETAINING LIP

9589

INJECTORS

Diagram 9.2

9477

PILOT PIPE

PIEZO
GENERATOR

ADAPTOR

SPLIT PIN

CIRCLIP

CONTROL
SPINDLE

THERMOCOUPLE
CONNECTION

GAS TAP

9.6 To Grease the Gas Tap

Remove the burner module as section 9.5.

Remove the circlip holding the piezo generator to the tap.

Remove the two screws from the head of the tap.

Remove the spindle and spring from the tap.

Note the position of the slot in the plug. Mark this position on the
tap body.

Rotate the plug and pull it out of the tap.

Clean and grease the plug lightly with a suitable grease. Do not
apply excessive grease. Particularly, make sure that the gas
ports are not restricted by grease.

Push the plug back into the tap body. Line up the slot in the plug
with the mark previously made on the tap body.

Reassemble in the reverse order making sure that the
components are correctly engaged. Check the operation of the
tap and piezo. Make sure that the control knob with spindle is
correctly turned to agree with the gas tap position before
refitting the split pin.

17

221904D

10 Fault Finding

10.1 Fire Font Ignition

Remove casing as section 9.

Refer to Fire Front Ignition Fault Finding, diagram 10.1.

Diagram 10.1

FIRE FRONT IGNITION FAULT FINDING

9631

10.2 Flue Blockage Safety Device

If the device operates it indicates there could be a problem with
the chimney. First make sure air vents are free of obstructions,
by carrying out spillage checks as section 7.

START HERE

Fire will not light

Turn off appliance tap; turn
on appliance tap and
observe spark

Spark
across gap,
ignition

No spark
across
gap

Spark
no
ignition

Using a match, ensure correct
functioning of burner in
all setting positions. Check that
electrode and piezo unit connections
are satisfactory. Check that
burner pressure is as specified.
Correct any fault found.

Spark
across gap,
ignition

No spark
across
gap

Spark
no
ignition

Ensure gap is within specified
tolerance, refer to SERVICING
Turn tap to energise igniter

Disconnect ignition lead from
electrode, place connector
within 4mm of burner and
operate piezo

Spark
across gap,
ignition

Spark
no
ignition

Replace pilot assembly and
reassemble ignition system

Spark
across gap,
ignition

Spark
no
ignition

Ensure gap is within specified
tolerance. Turn tap to energise
igniter

Spark
across gap,
ignition

Spark
no
ignition

Remove ignition lead from piezo unit
and place screwdriver between
appliance chassis earth and piezo
unit, leaving 4mm gap between blade
and spade connector.
Operate igniter.

Spark
across
gap

No spark
across
gap

Renew ignition lead and
reassemble ignition system

Spark
across gap,
ignition

Spark
no
ignition

Change piezo unit and
reassemble ignition system

Spark
across gap
ignition

Check several times that
ignition is satisfactory

END

18221904D

Disconnect appliance thermocouple from the gas tap. Check that all connections are

clean and in good condition. Fit test meter interrupter into the magnet unit. Fit appliance

thermocouple into the test meter interrupter.

NO

YES

Hold down control tap in ignition position. Ignite burner, allowing thermocouple to attain
operating temperature. Measure the OPEN CIRCUIT voltage.

Is voltage greater
than 15mV?

Faulty thermocouple.
Replace flue blockage
safety device.

Faulty thermocouple.
Replace flue blockage
safety device.

Note the open circuit reading then measure the CLOSED CIRCUIT voltage. Note this voltage.
Referring to the diagnosis graph, mark the open circuit voltage on the VERTICAL axis,
and the closed circuit voltage on the HORIZONTAL axis. Note the point where these
two values intersect on the graph.

THERMOCOUPLE
CIRCUIT IS
SATISFACTORY

In which area of the
graph is the intersect

Faulty magnet unit in gas tap.
Replace gas tap

B

A

C

10.3 Thermocouple

To test a thermocouple, a meter with a range of 0 to 30mV is
required together with a thermocouple interrupter test unit.

Refer to Fault Finding diagram 10.2 and Diagnosis Graph
diagram 10.3.

10 Fault Finding

Diagram 10.2

5243

Diagram 10.3

0065M

Closed Circuit Voltage (millivolts)
DIAGNOSIS GRAPH FOR FIRE

THERMOCOUPLE CIRCUIT

Open Circuit Voltage (millivolts)

0 1234567891011

7

8

9

10

11

12

13

14

15

16

17

ABC

0065M

19

221904D

11 Spare Parts

KEY DESCRIPTION No. OFF PART No GC PART No

A

B

F

E

G

H

J

C

D

9591

When spare parts are required apply to your local supplier.

Please quote the name of the appliance, also the serial number which can be found on the data label on the appliance.

If ordering from the local gas undertaking the appropriate appliance GC number should also be quoted together with the GC number
of the part.

A Gas Tap & Spark Generator 1 462500 ******
B Spark Generator 1 462501 ******
C Upper injector Bray Cat.28 Size 120 1 462502 ******
D Lower injector Bray Cat.28 Size 250B 1 462503 ******
E Pilot Unit 1 462504 ******
F Control Knob - Firelight 1 462505 ******

- Contour, Miami 1 462506
G Radiant 3 462507 ******
H Dress Guard - Miami (Illustrated) 1 427504 152 744

Firelite 1 462508 ******
Contour 1 462508 ******

J Dust Cage 1 462509 ******

20221904D

Because of our constant endeavour for improvement details may vary slightly from those in the instructions.