Glowworm Hideaway 80B FF User manual

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]
221958B.03.02
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
Balanced
Fanned Flue Boiler
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 and Servicing
REGISTER YOUR GLOW-WORM APPLIANCE
FOR 1ST YEAR GUARANTEE PROTECTION
CALL 0208 247 9857
Hideaway
80B FF
G.C. No. 41-047-35
9919

2
221958B
TESTING AND CERTIFICATION
This boiler is tested and certificated for safety and performance. It is therefore important that no alteration is made to the boiler, without
permission, in writing, from Hepworth Heating Ltd.
Any alteration not approved by Hepworth Heating Ltd., could invalidate the certification, boiler warranty and may also infringe the
current issue of the Statutory Requirements, see Section 1.3.
CE MARK
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler (Efficiency) Regulations, and therefore is deemed
to meet the requirements of Directive 92/42/EEC on the efficiency requirements for new hot water boilers fired with liquid or gaseous
fuels.
Type test for purposes of Regulation 5 certified by: Notified body 0086.
Product/production certified by: Notified body 0086.
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 the electrical equipment designed
for use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the Member States relating to electromagnetic compatibility.
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.
Ceramic fibre/Insulation Pads, Glassyarn
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 of the eyes or severe
irritation to the skin seek medical attention.
SPARE PARTS
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.
MANUAL HANDLING GUIDANCE
During the appliance installation and the replacement of the heat exchanger it will be necessary to employ caution and assistance
whilst lifting as the appliance or component exceeds the recommended weight for a one man lift.
In certain situations it may be required to use a mechanical handling aid.
Take care to avoid trip hazards, slippery or wet surfaces.
Important Information
Introduction 3
Lighting the Boiler 4
General Data 1 5
Water Systems 2 7
Flue & Ventilation 3 9
Installation 4 10
Electrical Wiring 5 17
Commissioning 6 18
Instructions to User 7 20
Servicing 8 20
Fault Finding 9 23
Replacement Parts 10 26
Spare Parts 11 28
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

3221958B
Instructions for Use
Introduction
Please read these instructions and follow them carefully for the
safe and economical use of your boiler.
The Glow-worm Hideaway B FF series are balanced fanned
flue boilers. They provide heating and if required, an indirect
domestic hot water supply.
The boiler is automatic in operation, having only one user
control, the boiler temperature control.
Gas Safety (Installation and Use) Regulations
In your own 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.
WARNINGS
Gas Leak or Fault
If a gas leak fault exists or is suspected the boiler must be
turned off, including the electrical supply and must not be
used until the fault has been put right. Advice/help should
be obtained from the local gas undertaking or your installation/
servicing company.
Clearances
Make sure that nothing obstructs the ventilation grills or
clearances.
Minimum clearances must be left around the boiler as
shown in diagrams 1.4, 1.5 & 1.6.
Sheet Metal Parts
This boiler contains metal parts (components) and care
should be taken when handling and cleaning, with particular
regard to edges.
Cleaning
Keep the casing clean by wiping it occasionally with a damp
soapy cloth and dry with a polishing cloth.
Do not use abrasive cleaners.
Boilers Installed in a Compartment
If the boiler is fitted in a compartment, cupboard etc., do not
obstruct the purpose built compartment vents or the grill on the
boiler.
Do not use the compartment for storage purposes.
Maintenance
To ensure the continued efficient and safe operation of the boiler
it is recommended that it is checked and serviced as necessary
at regular intervals. The frequency of servicing will depend upon
the particular installation conditions and usage, but in general
once a year should be enough.
It is the law that servicing must be carried out by a competent
person.
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.
To obtain service please call your installer or Heatcall (Glow-
worm’s own service organisation) using the telephone number
given on the inside of the front panel.
Please be advised that the ‘Benchmark’ logbook 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.
Boiler Electrical Supply
THIS BOILER MUST BE EARTHED.
The boiler must only be connected to a 230V~50Hz supply
protected by a 3A fuse, maximum.
All wiring must be in accordance with the current issue of
BS7671.
Heat resistant flexible cable having a conductor size of 0.75mm2,
to the current issue of BS6500 Table 16 must be used.
To Connect an Electrical Plug
The standard colours of three core flexible cable are,
Brown - live, Blue - neutral, Green and Yellow - earth.
As the markings on your plug may not correspond with these
colours, continue as follows:
The Blue cable must be connected to the terminal marked “N”
or “Black”.
The Brown cable must be connected to the terminal marked “L”
or “Red”.
The Green and yellow cable must be connected to the terminal
marked “E” or “Green” or the earth symbol .
Protection Against Freezing
If the boiler is to be out of use for any period of time during severe
weather conditions we recommend the whole system including
the boiler, be drained off to avoid the risk of freezing up. If an
immersion heater is fitted to the hot water cylinder make sure it
is switched off.

4
221958B
To Turn the Appliance On
Turn the electrical supply on to the boiler and check that all
remote controls are calling for heat.
Turn the boiler temperature control clockwise to any position
between “0” and "Max", see diagram 1.
"Max" is approximately 82°C (180°F).
The boiler lighting operation is now automatic as follows:
The fan operates and after a short period of time, the spark
ignition operates, the solenoid opens, then the burner will light
shown by the burner ON neon (green) on the control panel
lighting up.
The burner will remain alight until switched off by the control
thermostat or any remote control.
Note: If the boiler is turned OFF at the boiler temperature
control, wait at least 30 seconds before switching on again.
When the boiler switches off, the burner will go out.
The automatic lighting sequence will operate again when heat
is required.
It should be noted that this is a fanned flue appliance and fan
operation may be heard.
If the reset neon lights, turn the boiler temperature control to "0"
(off), wait 30 seconds, then repeat the lighting instructions.
To Turn the Appliance Off
For short periods, turn the boiler temperature control fully anti-
clockwise to “0” (off).
To relight, turn the boiler temperature control to any position
between “0” and “Max”.
For longer periods, turn the boiler temperature control fully anti-
clockwise to “0” (off) and switch off the electrical supply to the
boiler.
To relight follow the lighting sequence given above.
Instructions for Use
Diagram 1
BOILER
TEMPERATURE
CONTROL
9857
"BURNER ON"
NEON
RESET
NEON
"OFF"
POSITION

5221958B
1 General Data
Important Notice
This boiler is for use only on G20 gas.
The boiler is delivered in one pack and the flue pack is supplied
separately.
Wherever possible, all materials, appliances and components to
be used shall comply with the requirements of applicable British
Standards.
Where no British Standard exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Refer to Manual Handling Operations, 1992 Regulations.
Sheet Metal Parts
WARNING. When installing or servicing this boiler, care should
be taken to avoid any possibility of personal injury when handling
the edges of sheet metal parts.
1.1 Technical Data
See diagrams 1.1 & 1.2.
All dimensions are given in millimetres (except as noted) .
Approximate weight of complete boiler : 131.5kg (290lb)
Water content : 5.76 litre (1.27gallons)
Gas connection : Rc1/2(1/2in BSPT)
Water connection : Rc1 (1in BSPT)
Electrical supply : 230V~50Hz, fused 3A
Burner : Aeromatic
GENERAL DIMENSIONS - given in millimetres Diagram 1.1
9921
WATER CONNECTIONS
Rc1 (1in. B.S.P.T.)
WATER CONNECTIONS Rc1 reduced
with DISTRIBUTOR TUBE to
Rc 3/4(3/4in. B.S.P.T.) (pumped return)
GAS CONNECTION
Rc 1/2(1/2in. B.S.P.T.)
The Seasonal Efficiency Domestic Boilers UK (SEDBUK)
is 'D' 78.6%.
The value is used in the UK Government’s Standard Assessment
Procedure (SAP) for energy rating of dwellings. The test data
from which it has been calculated have been certified by B.S.I.
1.2 Range Rating
See diagram 1.2.
A
CDH
B
F
G
E
J
K
L
A B C D E F G H J K L M
387 700 558 294 364 555 442 3 Max 900/ 300 194 32
Min 860
M
NOTE: The boiler casing can be
set at two heights,
MAX. and MIN.
Diagram 1.2
10121

6
221958B
1.3 Statutory Requirements
The installation of this appliance must be carried out by a
competent person and must be in accordance with the relevant
requirements of the current issue of:
Manufacturer’s instructions supplied.
The Gas Safety (Installation and Use) Regulations, Building
Regulations, Local Water Company Bye-laws, The Building
Standards (Scotland) Regulations, (applicable in Scotland),
Health and Safety at Work Act, Control of Substances Hazardous
to Health, Electricity at Work Regulations and any applicable
local regulations.
Detailed recommendations are contained in the current issue of
the following British Standards and Codes of Practice,
BS6891, BS5440 Part 1 and 2, BS6798, BS5449, BS5546,
BS6700, BS7478, BS7593, BS7671.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
1.4 B.S.I Certification
This boiler is certificated by B.S.I., for safety and performance.
It is, therefore, important that no alteration is made to the boiler
unless agreed, in writing, by Hepworth Heating Ltd.
Any alteration not approved by Hepworth Heating Ltd., could
invalidate the B.S.I. certification, boiler warranty and could
infringe the current issue of the Statutory Requirements.
1.5 Gas Supply
The gas installation should be fitted in accordance with the
current issue of BS6891.
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler.
On completion test the gas installation using the pressure drop
method and suitable leak detection fluid, purge in accordance
with the current issue of BS6891.
1.6 Electrical
WARNING. This boiler must be earthed.
The electrical installation must be carried out by a competent
person. All external components shall be of the approved type
and shall be connected in accordance with the current issue of
BS7671 and any local regulations which apply.
Connection of the boiler and any system controls to the mains
supply through an unswitched shuttered socket outlet and 3A
fused 3 pin plug, both to the current issue of BS1363.
Alternatively, a 3A fused double pole isolating switch may be
used, having a minimum double pole contact separation of
3mm, serving only the boiler and system controls.
Heat resistant cable of at least 0.75mm2(24/0.20mm), to the
current issue of BS6500 Table 16, must be used for all
connections within the boiler casing, to the control box, pump
etc.
BOILER CASING HEIGHT(S) Diagram 1.3
BOILER
CASING
ALTERNATIVE
HEIGHT
POSITIONS
MIN.
MAX.
To
floor
level
FLOOR LEVEL
9922
1 General Data
Diagram 1.4
Diagram 1.5
MINIMUM CLEARANCES
LEVEL WITH WORKTOP
MINIMUM CLEARANCES
UNDER WORKTOP, FIXTURES
9923
407 MIN.
407 MIN.
CUPBOARDS
WORKTOP
10124
10 10
10 10
CUPBOARD
CUPBOARD
10
WORKTOP OR
FIXTURE
BOILER
BOILER
5
MAX.900
MIN. 860

7221958B
FRONT CLEARANCE Diagram 1.6
9713
700
BOILER
WALL OR
FIXTURE
1 General Data
1.7 Boiler Location
This boiler is not suitable for outside installation.
The boiler casing can be fitted at two heights. Refer to
diagram 1.3.
The boiler is assembled at the factory with the control box and
heat shield fitted in the lower position.
The boiler must stand on a level floor, conforming with local
authority requirements and building regulations.
The base temperature is within the requirements of the current
issue of BS5258. The boiler may stand on a wooden floor but
a metal base plate is required to protect plastic tiles and similar
floor coverings.
Suitable installation clearance needs to be available at the
sides of the boiler to facilitate direct connection of pipework and
making good around the flue assembly. The actual clearance
required will vary with site conditions.
When the boiler is to be installed level with work surfaces and
the like, minimum clearances should be provided as shown in
diagram 1.4. Work tops which overhang the cupboard sides,
almost in contact with the casing top, require a larger minimum
air gap. Flush sided fixtures require the same overall minimum
space but can have a reduced air gap on one side.
Boilers to be installed under work tops or fixtures, should be
positioned to provide minimum clearances as shown in diagram
1.5. To facilitate minimum clearances it may be necessary to
modify kitchen units and fixtures.
A front access clearance should be provided as shown in
diagram 1.6.
The boiler may be installed in any room, although particular
attention is drawn to the requirements of BS7671 with respect
to the installation of a boiler in a room containing a bath or
shower. Any electrical switch should be so positioned that it
cannot be touched by a person using the bath or shower. The
electrical provisions of the Building Standards (Scotland)
Regulations apply to such installations in Scotland.
Where the installation of the boiler will be in an unusual location,
special procedures are necessary the current issue of BS6798
gives detailed guidance on this aspect.
2 Water Systems
2.1 Water Pressure Head
The boiler shall only be connected to a cistern water supply with
a minimum head of 1metre (3ft3in) and a maximum head of
27metres (90ft) which has an open vent in the system.
The working pressure must be within the range 0.1bar to 2.7bar
(1.3 to 39lbftin2).
The boiler MUST NOT be connected to a sealed water system.
2.2 Inhibitor
Attention is drawn to the current issue of BS5449 and BS7593
on the use of inhibitors in central heating systems.
If an inhibitor is to be used in the system, contact should be
made with the inhibitor manufacturers so that they can
recommend their most suitable product.
When using in an existing system take special care to drain the
entire system, including the radiators, then thoroughly clean
out before fitting the boiler whether or not adding an inhibitor.
Diagram 2.1
0869
27metres
Max.
PUMP
Heating
Circuit
INDIRECT
CYLINDER
(Shown with
recommended
thermostat and valve).
22mm VENT
15mm COLD FEED
REFER TO BS 5546
28mm
Distributor tube in
pumped return
connection
BOILER
C
L
DRAIN OFF
COCK
A compartment used to enclose the boiler must be designed
and constructed specifically for this purpose. An existing
cupboard or compartment modified for the purpose may be
used. Details of essential features of cupboard or compartment
design are given in the current issue of BS6798.
If the boiler is to be installed in a compartment, make sure that
nothing will obstruct the openings/vents in the compartment.
1.8 Heating System Controls
The heating system should have installed: a programmer and
room thermostat controlling the boiler.
Thermostatic radiator valves may be installed, however they
must not be fitted in a room where the room thermostat is
located.
Note: For further information, see the current issue of the
Building Regulations, approved document L1, and the
references:
1) GIL 59, 2000: Central heating system specification (CheSS)
and
2) GPG 302, 2001: Controls for domestic central heating
system and hot water. BRECSU.

8
221958B
Diagram 2.2
FULLY PUMPED SYSTEM
(DIAGRAMMATIC)
2 Water Systems
0870
1 metre
MIN.
27metres
MAX.
PUMP
Heating
Circuit
TO INDIRECT
CYLINDER
22mm VENT
15mm
COLD FEED
Distributor tube in
pumped return
connection
BOILER
C
L
DRAIN OFF
COCK
2.3 Gravity Domestic and Pumped Heating
It is recommended that a cylinder thermostat is used to prevent
the stored water temperature becoming unnecessarily high
when the central heating pump is off.
The domestic primary flow and return must be 28mm o.d. The
installation must comply with the current issue of BS5546 and
BS6700, see diagram 2.1.
If the above conditions cannot be met, it is suggested that a fully
pumped system be used.
2.4 Pumped Heating and Hot Water
Where a single flow and return is taken from the boiler, a
minimum static head of 1metre (3ft3in) must be provided
between the water line of the feed tank and the centre of the
waterway, see diagram 2.2.
2.5 Circulation Pump
Normally the pump should be set to give a temperature difference
of 11oC (20oF) across the boiler. At the appropriate pumped flow
rate the pressure loss through the boiler can be found from the
graph, diagram 2.3.
Use a pump with integral valves or fit isolating valves as close
to the pump as possible.
2.6. Cylinder
For all systems supplying domestic hot water the cylinder must
be indirect.
2.7 Safety Valve
A safety valve need not be fitted to an open vented system.
2.8 Draining Tap
A draining tap must be provided at the lowest points of the
system which will allow the draining of the entire system,
including the boiler and hot water cylinder.
Draining taps should be to the current issue of BS2879.
2.9 Thermostatic Radiator Valves
If thermostatic radiator valves are fitted care must be taken to
ensure that there is an adequate flow rate through the boiler
when they close, refer to the current issue of BS7478 for
guidance. If fitted to all radiators ensure a bypass is fitted and
adjust to achieve a temperature difference no greater than 20°C
between flow and return with the thermostatic valves closed.
Diagram 2.3
1.50
1.25
1.00
0.75
0.50
0.25
0
30
20
10
0
0612 18 24 30 36 42
FLOW RATE (LITRES/MINUTE)
WATER PRESSURE LOSS (metre HEAD OF WATER)
WATER PRESSURE LOSS (INCHES HEAD OF WATER)
60
40
2.00
70
50
1.75
0123456789
FLOW RATE (GALLON/MINUTE)
1074

9221958B
3 Flue and Ventilation
FROM
OUTSIDE
COMPARTMENT AIR VENT TABLE
COMPARTMENT
VENTILATION
REQUIREMENTS
VENTILATION
FROM ROOM
OR SPACE
HIGH LEVEL LOW LEVEL
VENT AREA VENT AREA
The flue must be installed in accordance with the rules in force
in the countries of destination.
3.1 Terminal Position
The minimum acceptable siting dimensions for the terminal
from obstruction, other terminals and ventilation openings are
shown in diagram 3.1.
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
Car ports or similar extensions of a roof only, or a roof and one
wall, require special consideration with respect to any openings,
doors, vents or windows under the roof. Care is required to
protect the roof if it is made of plastic sheeting. If the car port
consists of a roof and two or more walls, seek advice from the
local gas company before installing the boiler.
If the terminal is fitted within 600mm below plastic guttering or
painted soffit an aluminium shield 1500mm long should be fitted
immediately beneath the guttering or eaves. If the terminal is
fitted within 450mm below painted eaves or a painted gutter, an
aluminium shield 750mm long should be fitted immediately
beneath the guttering or eaves.
3.2 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
document IGE/UP/7/1998. If in doubt seek advice from the local
gas undertaking or Hepworth Heating Ltd.
3.3 Terminal Guard
A terminal guard is required if persons come into contact with
the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
a minimum of 50mm clearance from any part of the terminal and
be central over the terminal.
A suitable guard, reference Type “K3”, can be obtained from:
Tower Flue Components Ltd.,
Morley Road, Tonbridge,
Kent. TN9 1RA
3.4 Room Ventilation
The boiler is room sealed and does not require the room or
space containing it to have permanent air vents.
3.5 Compartment Ventilation
Where the boiler is fitted in a compartment, the high and low
level permanent air vents must have effective areas, see
“Compartment Air Vent Table”.
Both the high and level air vents must communicate with the
same room or must both be on the same wall to outside air.
Diagram 3.1
0103M
A
A
F
GE
A
G
G
G
B,C B,C
FF
K
K
K
C
G
LL
Under Car Port etc.
H,I
JD
F
K
M
MINIMUM SITING DIMENSIONS FOR
FANNED FLUE TERMINALS POSITION
ADIRECTLY BELOW, ABOVE OR HORIZONTALLY
TO AN OPENING, AIR BRICK, OPENING
WINDOWS, AIR VENT OR ANY OTHER
VENTILATION OPENING. 300
BBELOW GUTTER, DRAIN/SOIL PIPE 25
CBELOW EAVES 25
DBELOW A BALCONY OR CAR PORT 25
EFROM VERTICAL DRAIN PIPES AND SOIL PIPES 25
FFROM EXTERNAL CORNERS 25
GABOVE ADJACENT GROUND OR BALCONY LEVEL 300
HFROM A SURFACE FACING THE TERMINAL 600
IFACING TERMINALS 1200
JFROM OPENING (DOOR/WINDOW) IN
CAR PORT INTO DWELLING 1200
KVERTICAL FROM A TERMINAL 1500
LHORIZONTALLY FROM A TERMINAL 300
MFROM INTERNAL CORNERS 25
MINIMUM
SPACING in mm
272cm242in2272cm242in2
136cm221in2272cm242in2

10
221958B
Diagram 4.2
10051
General Installation Notes
The appliance pack contains :-
Boiler
Fan connector
Casing panels, packed seperately.
Loose items fittings pack, see list in pack.
The flue is supplied seperately.
NOTE: The rear flue option kit Part No. 425861 is available,
which consists of wall cover plates, for replacement Hideaway
balanced flue appliances.
Before installation of the boiler make sure that the location
selected is in accordance with the requirements of Section 1.7.
4.1 Unpacking
The boiler casing panels are packed separately within the main
carton and are designed to enable gas and water connections
to be made before fitting the casing panels.
The casing brackets, flue restrictor, distributor tube and other
loose items, are in the fittings pack.
NOTE:
To make a neat finish to the flue outlet a flue collar kit, part No.
900850, with instructions, is available, see diagram 6.4.
If required an optional wall liner kit, part no. 900862, is available
complete with instructions.
All flue assemblies are designed for internal installation.
Make sure that the ductings do not slope down towards the
boiler.
Diagram 4.1
9867
9868
4.2 Flue Position and Length
Select the boiler location, with due regard to the flue length and
terminal position, see diagrams 3.1 and 4.1.
For a wall thickness up to 300mm, provided that the optional
wall liner kit is used, the flue can be fully installed from the
inside.
For a wall thickness of over 300mm the external flue hole will
need to be made good from the outside, this also applies if you
use the flue kit without the optional wall liner kit, irrespective of
wall thickness.
4 Installation
REAR STD.
REAR 75 95 510
MINIMUM
WALL
THICKNESS
MINIMUM
FLUE
LENGTH
MAXIMUM
FLUE
LENGTH
FLUE
PACKS
NOTE :
IF IT IS NECESSARY TO CUT THE DUCTS
TO ACHIEVE THE "FLUE LENGTH" MAKE SURE
THAT THE OVERLAPS ARE AS FOLLOWS :-
THE OVERLAP FOR AIR DUCT = 25mm
THE OVERLAP FOR FLUE DUCT = 50mm
FLUE & AIR DUCT LENGTH = A + 15 + 3
387
194
700
115
BOILER
OUTLINE
FRONT VIEW
*INCREASE TO 30mm IF A FLUE COLLAR IS ADDED
*

11 221958B
4.3 Flue Hole Cutting
Mark out the flue centre, see diagram 4.2, then cut a hole for the
flue using, preferably, a 115mm minimum core drill.
4.4 Rear Flue Option Kit - 425861 (if applicable)
Fit the wall cover plates as described in the instructions supplied
with the kit.
4.5 Flue Preparation
Note: If the flue collar kit, see diagram 4.4, is to be used
increase the 15mm projection to 30mm.
Extend the telescopic flue to the required length, making sure
that the minimum overlap is no less than 25mm, and that the flue
terminal projects 15mm minimum beyond wall face, see diagram
4.1.
If it is necessary to cut the flue ensure that the overlap is as
stated in diagram 4.1.
Carefully drill though air duct pilot hole and secure with self
tapping screw provided in fittings pack, see diagram 4.3.
Seal the joint with the tape provided.
Note: Should any one of the flue sections require cutting to
obtain desired flue system length make sure that the overlaps
are as follows:-
The overlap for air duct = 25mm
The overlap for flue duct = 50mm.
Take the terminal restrictor and position the clamping bracket
making sure the clamping bracket nib protrudes in the slot of the
terminal restrictor and secure with locking screw, but do not
tighten, see diagram 4.5.
Engage the terminal restrictor on the flue terminal by hooking it
over the terminal end and engaging the clamping bracket
behind the inner ring of the terminal securing it by tightening the
locking screw, see diagram 4.5.
9869
SCREW (4)
SPIGOT
GASKET
FLUE
BAYONET
CONNECTION
Diagram 4.4
7148
OPTIONAL
FLUE
COLLAR
4 Installation
Diagram 4.3 Diagram 4.5
7323
RESTRICTOR
CLAMPING
BRACKET
CLAMPING
BRACKET NIB
FLUE
TERMINAL
LOCKING
SCREW
TERMINAL RESTRICTOR
SHOWN FITTED
STANDARD 510mm REAR
7332
SCREW
AND TAPE
Fit the self adhesive foam seal provided in the flue pack around
the air duct at the position shown in diagram 4.6.
Make sure that the ductings do not slope down towards the
boiler.
Make good around the flue outside after installation of the boiler.
Important: If the wall liner kit is used, the self adhesive foam seal
included in the wall liner kit must be used in place of the one
supplied with the flue pack, see diagram 4.6 for position of self
adhesive seal.
Push the flue assembly into and through the hole such that it is
within the wall, and does not stick out into the room. Do not push
the flue assembly too far into the hole as it has to be pulled back
into the boiler and secured.
If the boiler is not to be fitted for some time cover the hole in the
wall.

12
221958B
Diagram 4.7
WATER CONNECTIONS - GRAVITY
DOMESTIC, PUMPED HEATING
ALTERNATIVE
HEATING
RETURN
With distributor
tube (not shown)
ALTERNATIVE
HEATING OR
DOMESTIC
HOT WATER
FLOW
GRAVITY
DOMESTIC
RETURN TO
ANY OF THE
3 REMAINING
LOWER CONNECTIONS
9859
4.6 Water Connections - Gravity Domestic and
Pumped Heating
Fit suitable fittings into the boiler tappings, see diagram 4.7.
Make sure that all pipes are taken backwards and will clear the
casings, see diagram 1.1.
Heating flow: Any one of the four upper connections may be
used.
Domestic flow: Any one of the three remaining upper connections
may be used.
Heating return: The water distributor tube must be fitted into
either of the front lower connections on all installations, see
diagram 4.8. This tube is in the fittings pack.
Domestic return: Any one of the three remaining lower
connections may be used for the gravity domestic hot water
return.
Fit plugs into any unused boiler tappings.
4.7 Water Connections - Fully Pumped
Systems
Fit suitable fittings into the boiler tappings as required, see
diagram 4.9. Make sure that all pipes are taken backwards and
will clear the casings.
It is important that all connections are made as shown in
diagram 4.9.
Fit the water distributor tube into the return connection, see
diagram 4.8. This tube is in the fittings pack.
Fit plugs into any unused boiler tappings.
4 Installation
Diagram 4.6
FOAM SEAL
FOAM SEAL
WALL THICKNESS-
OVER 300mm
15mm
WALL THICKNESS-
UP TO 300mm
Q-35mm
Q
Q
7102
WITH WALL LINER KIT ONLY
DISTRIBUTOR TUBE Diagram 4.8
1277
UPPER
MARKER
DISTRIBUTOR
TUBE
must be in
pumped return
connection
UPPER MARKER
must lie between the
two outer NOTCHES
Diagram 4.9
WATER CONNECTIONS FULLY
PUMPED SYSTEMS
9859
ALTERNATIVE
FLOW
POSITIONS
ALTERNATIVE
RETURN
POSITIONS
With distributor
tube (not shown)

13 221958B
CASING BRACKETS FITTING Diagram 4.12
9858
FRONT
CASING
BRACKET
No.8
SCREW
(4)
CAPTIVE
NUT
UPPER CASING
BRACKET
CAPTIVE
NUT
4.8 Pipework
When the front tappings are used, it is essential that any
pipework or fittings do not project more than shown in diagram
4.10.
When using a rear tapping with Rc (1in BSP) fitting for 28mm od
pipework, it is recommended that a short nipple and an Rc
thread (BSP) to copper elbow is used. If the pipework is required
to run back to the wall, make sure that it will clear the boiler air
duct and, if working to minimum clearance, does not project too
far from the boiler, see diagram 4.11.
Do not route any pipework, water or gas, across the front of the
combustion chamber cover.
The gas pipework must be along the left hand side of the boiler.
4 Installation
No.8
SCREW
(4)
4.9 Casing Brackets
Fit the two upper and two front casing brackets shown in
diagram 4.12, using the No.8 screws provided.
NOTE: The screws will already be fitted.
Push the captive nuts, supplied loose, on to the casing brackets
as shown in diagram 4.12.
Diagram 4.10
PIPEWORK CASING
CLEARANCES
Diagram 4.11
REAR CONNECTION
PIPEWORK (28mm)
9861
FOR MINIMUM
CLEARANCE
9860

14
221958B
4.10 Side In-fill Panel (if required)
A side in-fill panel is supplied with the boiler, which can be fitted
at the rear of the left or right hand side casing but can be
discarded if the water connections are made on both sides of
the boiler or if the boiler is screened by fixtures. The in-fill panel
will usually be fitted on the side where there no pipework
connections.
Insert the push fit plastic location peg, supplied, through the in-
fill panel and side casing holes and secure with the spring clips,
see diagram 4.13.
NOTE
The boiler is assembled at the factory with the control box and
heat shield fitted in the lower casing height position.
9863
SIDE CASINGS FITTING Diagram 4.14
MAX.
SIDE
CASING
(R.H.)
MIN.
BOILER
PLINTH
FRONT
CASING
BRACKET
No. 8
SCREW
(4)
LOCATING
SLOTS
4 Installation
Diagram 4.13 Diagram 4.15
SCREW
SIDE CASING
(R.H. SHOWN)
UPPER
CASING
BRACKET
PLASTIC
PEG
PLASTIC
PEG
SPRING
CLIP
SIDE
CASING
(R.H.SHOWN)
UPPER VIEW
LOWER VIEW
SPRING
CLIP
SIDE
CASING
(R.H. SHOWN)
IN-FILL
PANEL
IN-FILL
PANEL
4.11 Side Casings
Fit the side casings by locating their lugs into the appropriate
slot in the boiler plinth, see diagram 4.13, depending on the
required height, there are two options, see section 1.7.
Secure the casing sides to the front and rear upper casing
brackets with self-tapping screws supplied, see diagrams 4.13
and 4.15.

15 221958B
4 Installation
Diagram 4.16
0886
WING NUT
SELF
TAPPING
SCREWS
(3)
Diagram 4.17
TOGGLE
LATCHES
FAN ACCESS DOOR
4.12 Flue / Boiler Connection
Remove the three self-tapping screws from the lower part of the
control box support bracket, see diagram 4.16.
Undo the wing nut that secures the top of the heat shield and
carefully hinge down control box and heat shield, see diagram
4.16.
Release the two toggle latches that secure the boiler access
door and remove, see diagram 4.17.
Remove the electrical connections from the fan by pulling the
insulation boots only.
Disconnect the two air pressure tubes from the fan taking note
of their positions.
Remove the fan assembly from the flue hood by removing the
securing screw, pull forward and lift up to release the 3 hooked
securing lugs underneath the fan, see diagram 4.18.
From the flue pack take the flue spigot,the gasket is supplied in
the fittings pack.
Connect the flue spigot and gasket to the rear flue outlet of the
boiler using the self tapping screws provided, see diagram 4.3.
IMPORTANT. With regards to the Manual Handling Operations,
1992 Regulations, the following operation, exceeds the
recommended weight for one man lift.
Place the boiler in position taking care not to damage the casing
panels.
With access to the flue system through the boiler, pull the flue
on to the spigot bayonet connection, twist anti-clockwise to lock
into position.
Take the flue duct extension from the boiler and slide on to the
fan duct until it will go no further, see diagram 4.19.
Fit fan and engage the flue duct extension into the flue duct,
secure fan, replace electrical connections and air pressure
tubes.
The polarity of the electrical connections is not important.
Make sure that the air pressure tubes are fitted as before, see
diagram 4.20 and that the fan duct engages fully into the flue
duct extension piece.
(3) SELF
TAPPING
SCREWS
(for height
adjustment
only)
"LOW"
position
"HIGH"
position
"LOW"
position
"HIGH"
position
Diagram 4.18
SECURING
LUGS

16
221958B
4.13 Water & Gas connections
Replace fan access door, heat shield and control box.
Note: When replacing the fan access door make sure the lip at
the top of door fits into and behind the slotted bracket located at
the top of the boiler.
As there are two casing height options, the control box height
and the heat shield may have to be adjusted to suit your
requirements.
Complete the water connections to the boiler.
Fill, vent and flush the system.
Check for any water leaks and put right.
Make the gas connection to the service cock, at the lower left
hand side of the boiler, see diagram 1.1.
The whole of the gas installation, including the meter, should be
inspected, tested for soundness and purged in accordance with
the current issue of BS6891.
4.14 Top Casing
Refer to diagram 4.21.
Fit two plastic pegs, one on each side, in the holes on the top
casing. The plastic pegs are a tight fit and are best pushed home
with a flat faced tool.
Secure front of top casing with the screws provided.
4 Installation
Diagram 4.21
TOP CASING
9865
SCREW (2)
PLASTIC
PEG (2)
Diagram 4.20
FRONT AIR PRESSURE
SWITCH TUBE (CLEAR)
FAN ELECTRICAL
CONNECTORS
10149
Diagram 4.19
FLUE DUCT
EXTENSION PIECE
FAN
AIR
PRESSURE
TUBE (RED)
FAN
SECURING
SCREW
REAR AIR PRESSURE
SWITCH TUBE (RED)
10259

17 221958B
bk
5 Electrical Wiring
MAINS INLET
CONNECTOR Diagram 5.2
0000
0000
CABLE
CLAMP
SCREW
5.1 Control Box Access
Remove control box cover by undoing the four securing screws
(two on control box, two on the heat shield) and lift off, see
diagram 5.1.
5.2 Electrical Connections
WARNING. This boiler must be earthed.
Take care not to damage any internal wiring.
Using heat resistant (85oC) cable of at least 0.75mm2(24/
0.2mm) and of a suitable length, route as shown in diagram 5.3.
Thread through the grommet at the bottom rear of the control
box, through the cable clamp and connect to appropriate
terminals. Tighten cable clamp screws, see diagram 5.2.
Standard colours are, brown - live (L), blue - neutral (N) and
green/yellow - earth .
The mains cable outer insulation must not be cut back external
to the cable clamp.
Make sure the cable is suitably secured.
When making connections make sure that the earth conductor
is made of a greater length than the current carrying conductors,
so that if the cable is strained the earth conductor would be the
last to become disconnected.
5.3 Pump Connection
The pump must be connected to the external controls.
5.4 Testing - Electrical
Checks to ensure electrical safety must be carried out by a
competent person.
After installation of the system, preliminary electrical system
checks as below should be carried out.
1. Test insulation resistance to earth.
2. Test earth continuity and short circuit of all cables.
3. Test the polarity of the mains.
The installer is requested to advise and give guidance to the
user of the controls scheme used with the boiler.
Replace the control box cover. Diagram 5.3
CABLE
CLAMP
CONTROL
BOX
COVER
CONTROL
BOX
SECURING
SCREWS
BOILER
TEMPERATURE
CONTROL
Diagram 5.1
9905
CABLE
CLIPS
CABLE
CLIPS
HEAT RESISTANT
CABLE
TERMINAL BLOCK
CONNECTIONS
TERMINAL
BLOCK

18
221958B
6 Commissioning
IMPORTANT NOTE
The WARNING NOTICE attached to the front casing
must only
be removed by the user
Please ensure the “Benchmark” logbook is completed and left
with the user, and the magnetic lighting instruction label is
placed on the surface of the boiler casing.
6.1 All Systems
Commissioning should be carried out by a competent person in
accordance with the current issue of BS6798.
UNDER ALL CIRCUMTANCES the case must be correctly
fitted and sealed, unless fault finding.
Make sure that the system has been thoroughly flushed out with
cold water without the pump in place.
Refit the pump, fill the system with water, ensuring that all the
air is properly vented from the system and pump.
6.2 Initial Lighting and Testing
CAUTION. This work must be carried out by a competent
person, in accordance with the current issue of BS6798.
Make sure that all naked lights and cigarettes are extinguished.
Refer to ‘Instructions for Use’ and identify the controls.
Check that the boiler is isolated from the electrical supply.
Turn the gas service cock “On” , see diagram 6.1.
Purge in accordance with the current issue of BS6891.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
If programmer control is fitted, make sure it is in the ON mode.
Make sure that any remote controls are calling for heat.
Diagram 6.1
BOILER COMPONENTS
10052
A CONTROL BOX
B PHIAL POCKET
C GAS SERVICE COCK
D "BURNER ON" NEON
E RESET NEON
F TEMPERATURE CONTROL
G BURNER PRESSURE TEST POINT
H GAS PRESSURE ADJUSTMENT SCREW
J DATA LABEL
E
D
A
G
Turn the boiler temperature control clockwise to “Max”.
The ignition system will operate to light the boiler. After a pre-
set time if ignition has not taken place the boiler will shutdown.
To re-start the lighting sequence, turn the boiler temperature
control to “O”, then fully clockwise to “Max”.
"Max" is approximately 82°C (180°F).
After the burner has lit, the “Burner on” neon on the control panel
will come on.
Isolate the boiler from the electrical supply.
Loosen the burner pressure test point screw and connect a
suitable pressure gauge, see diagram 6.1.
Switch on the electrical supply to the boiler.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
6.3 Testing - Electrical
Turn the boiler temperature control fully clockwise to the
maximum setting.
The lighting sequence is automatic as follows:
The fan operates and after a short period of time, the spark
ignition operates, the solenoid opens, then the burner will light
shown by the “Burner On” neon on the control panel lighting up.
The burner will remain alight until switched off, either by the
boiler temperature control, programmer (if fitted) or any remote
system control.
To make sure that the flame supervision device is working
correctly the following should be done.
With the burner alight, turn the gas service cock “Off”, see
diagram 6.1.
After a short period the burner will go out.
F
B
C
H
A
0000
J

19 221958B
6 Commissioning
The correct working of the flame supervision is shown by the
“Burner On” neon going out and the ignition sequence starting
up.
After a short period the boiler will shut down.
If the lighting sequence described fails, refer to fault finding
section 9.
To carry on turn the gas service cock “On”, see diagram 6.1.
To re-start the lighting sequence, turn the burner temperature
control to “0” then fully clockwise to “Max.”.
During normal operation when the boiler switches “Off”, the
burner will go out. The automatic lighting sequence will work
again when heat is required.
If the reset neon lights, turn the boiler temperature control to "0"
(off), wait 30 seconds, then repeat the lighting instructions.
6.4 Testing - Gas
With the boiler on proceed as follows:
Test for gas soundness around the boiler gas components
using a suitable leak detection fluid, in accordance with the
current issue of BS6891.
Check the burner gas pressure at least 10 minutes after boiler
has lit, refer to Data Label, see diagram 1.2.
If necessary adjust the gas pressure to obtain the required
setting turning screw clockwise, to decrease pressure, see
diagram 6.1.
Should any doubt exist about the gas rate, check it using the
gas meter test dial and stop watch at least 10 minutes after the
burner has lit, making sure that all other gas burning appliances
and pilot lights are off.
Gas rate: Hideaway 80B FF : 2.8m3/h (79ft3/h)
is for guidance only, dependent on the heat setting.
Turn the boiler temperature control fully anti-clockwise to “0”.
Isolate from the electrical supply.
Remove the pressure gauge from the test point and refit screw,
making sure a gas tight seal is made.
When the boiler temperature control is turned to the “0” position,
by hand, wait at least 30 seconds before turning On again.
There may be an initial smell given off from the boiler when new,
this is quite normal and it will disappear after a short period of
time.
6.5 Testing - All Water Systems
Allow the system to reach maximum working temperature and
examine for water leaks.
There should be no undue noise in the system.
The boiler should then be turned off and the system drained off
as rapidly as possible,whilst still hot.
Refill system.
6.6 Open Vented System
Ensure there is no pumping over of water or entry of air at the
open vent above the feed and expansion cistern.
6.7 Adjustment - Fully Pumped Open Vented
System
When commissioning the system the boiler should first be fired
on full service, that is, central heating and domestic hot water.
Adjust the pump to the system design setting, then balance the
system, making adjustments as necessary.
Diagram 6.2
LOCATING
STUDS
LOCATE
UNDER LIP
FRONT
PANEL
Diagram 6.3
FRONT PANEL
SECURING SCREWS
BOTTOM PLINTH
PANEL
SECURING SCREWS
6.8 Completion
Adjust the boiler temperature control and any system controls
to their required settings.
Fit the bottom plinth panel and secure with two dog point
screws, see diagram 6.2.
Finally fit the front panel by hooking under front of top panel
locating on the two studs, see diagram 6.2 and securing at the
bottom on to the bottom plinth panel with two screws, see
diagram 6.3.

20
221958B
7 Instructions to the User
Instruct and demonstrate the safe and efficient operation of the boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe operation of the boiler, it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will depend upon the particular installation and usage, but in general once
a year should be enough.
Draw attention, if applicable to the current issue of the Gas Safety (Installation and Use) Regulations, Section 35, which imposes
a duty of care on all persons who let out any property containing a gas appliance.
It is the Law that servicing is carried out by a competent person.
Advise the user of the precautions necessary to prevent damage to the system and building in the event of the heating system being
out of use during frost and freezing conditions.
Reminder - Leave these instructions and the “Benchmark” logbook with the user.
8 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.
Products of Combustion Check
Note: To obtain a products of combustion reading, remove the
front panel and remove the control box as descibed in the
relevant paragraphs of section 4.12. Next, remove the cap from
the sampling point, located on the top of the left hand side of the
inner casing, see diagram 8.1.
Connect the analyser tube on to the nipple.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
Switch on the electrical supply and gas supply then operate the
boiler.
On completion of the test switch off the electrical supply and gas
supply, remove analyser tube and replace sampling point cap.
Servicing
Before servicing turn off the gas and isolate the electrical supply
to the boiler.
After completing a service always test for gas soundness, make
electrical checks and carry out functional check on controls.
Unless stated otherwise all parts are replaced in the reverse
order to removal.
8.1 Access
Remove the boiler front casing panel, refer to paragraph 6.8.
Remove the bottom plinth panel by unscrewing the two dog
point screws securing the panel to the boiler plinth, see diagram
8.4.
Disconnect gas valve from gas cock and unplug electrical plug
from gas valve, firstly removing electrical plug securing screw,
see diagram 8.2.
Unclip electrical wires from control box support bracket, see
diagram 8.3.
Undo the four self-tapping screws that secure the combustion
chamber front and carefully withdraw it together with the burner
and gas valve assembly, taking care not to strain the ignition
and earth wire, see diagram 8.5.
Note: When replacing burner in combustion chamber make
sure it fits correctly on the guides.
Diagram 8.2
0000
GAS
SERVICE
COCK
UNION
ELECTRICAL
PLUG
Diagram 8.1
0000
SAMPLE POINT
Disconnect the ignition and earth leads from the burner and
remove by drawing the leads though the grommet, see diagram
8.5.
Remove the three self-tapping screws from the lower part of the
control box support bracket, see diagram 8.6.
Undo the wing nut that secures the top of the heat shield and
carefully hinge down control box and heat shield, see diagram
8.6.
Release the two toggle latches that secure the boiler access
door and remove, see diagram 8.7.
SECURING
SCREW