Saunier Duval Themaclassic F24E PLUS Operating manual

Themaclassic
F24E
Fanned Flue Combination Boiler
G.C.No. 47-047-35
To be left with the user
Instructions for Use
Installation and Servicing
F24E shown
4000124050-2 10.03
Hepworth Heating Ltd., Nottingham Road, Belper, Derbyshire. DE56 1JT
Themaclassic
F18E SB
Fanned Flue System Boiler
G.C. No.41-920-35

2
4000124050-2
Guarantee Registration
Thank you for installing a new Saunier Duval appliance in your home.
Saunier Duval appliances' are manufactured to the very highest standard so we are pleased to offer our customers’ a
Comprehensive Guarantee.
This product is guaranteed for 24 months from the date of installation or 30 months from the date of manufacture,
whichever is the shorter, for parts. In addition this product is guaranteed for 12 months from the date of installation or
18 months from the date of manufacture, whichever is the shorter, for labour.
The second year of the parts guarantee, from the beginning of the 13th month onwards after installation, is conditional
upon the boiler having been serviced by a CORGI registered gas installer, in accordance
with the manufacturer's recommendations. We strongly recommend regular servicing of your gas appliance, but where
the condition is not met, any chargeable spare parts or components issued within the applicable guarantee period still
benefit from a 12 month warranty from the date of issue by the manufacturer.
We recommend you complete and return as soon as possible your guarantee registration return literature, supplied in
the document envelope.
If your guarantee registration return literature is missing you can obtain a copy by telephoning
Saunier Duval Service on 00 44 (0)1773 828100.
RECORD YOUR SAUNIER DUVAL APPLIANCE DIRECT BY CALLING
0208 247 9857
Customer Service:
Saunier Duval GB GREAT BRITAIN:
Tel. [phone]
Fax. [phone]
Hepworth Heating Ltd.,
Nottingham Road, Belper, Derbyshire. DE56 1JT
Saunier Duval IE IRELAND:
Tel. 00 353 (0)14191919
Fax. 00 353 (0)14584806
Hevac ,
Muirfield Drive
Naas Road
Dublin 12
Technical Advice Line:
Tel. [phone]
General and Sales enquiries :
Tel. [phone]
Fax. [phone]
(0)

34000124050-2
Important Information 4
Draining and Filling 5
Appliance Introduction 5
Appliance Safety Devices 6
Maintenance and Servicing 6
User Controls and Lighting 7
Analogue Programmer F24E only 8
Digital Programmer Kit F24E only 8
Technical Data 1 11
General Information 2 12
Heating System Design 3 13
Domestic Hot Water System Design F24E only 415
Boiler Schematic F24E 516
Boiler Schematic F18E SB 5a 16
Boiler Location, flue and ventilation 6 17
Fixing Jig 7 18
Piping System Installation 8 19
Boiler installation 9 20
Horizontal Telescopic Top Flue Installation 10 21
Horizontal Top Flue Installation 10a 23
Electrical Connection 11 25
Commissioning 12 27
Changing Gas Type 13 29
Bypass Settings 14 29
Routine Cleaning and Inspection 15 30
Fault Finding 16 34
Wiring Diagram F24E 17 40
Wiring Diagram F18E SB 17 41
Replacement of Parts 18 42
Spare Parts 19 52
CONTENTS DESCRIPTION SECTION PAGE No.
SERVICING
INSTRUCTIONS
INSTALLATION
INSTRUCTIONS
INSTRUCTION
FOR USE
Contents

4
4000124050-2
Gas safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law that ALL gas
appliances are installed and serviced by a competent person
in accordance with the regulations.
Gas leak or fault
WARNING:If a gas leak or fault exists or is suspected, turn the
boiler off and consult the local gas supply company or your
installation/service company.
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. The requirements are: The installation of this
boiler must be carried out by a competent person in
accordance with the current rules in force in the countries of
destination at the time of installation, for Ireland, install in
accordance with I.S.813 "Domestic Gas Installation".
Manufacture's instructions supplied must not be taken as
overriding statutory requirements.
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 0049.
Product/production certified by: Notified body 0049.
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.
Control of Substances Hazardous to Health
The adhesives and sealants used in this appliance are cured
and give no known hazard in this state.
Insulation pads / ceramic fibre
These can cause irritation to skin, eyes and the respiratory
tract.
If you have a history of skin complaint you may be suscepti-
ble 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.
The insulation is composed of non-combustible material.
Electrical Supply
WARNING: This boiler must be earthed.
All system components shall be of an approved type and shall
be connected in accordance with the current issue of BS7671
and any applicable local regulations.
External wiring must be correctly earthed, polarised and in
accordance with the relevant standards.
In GB this is BS 6891.
In IE this is the current edition of I.S.813 "Domestic gas
installation".
Connection of the boiler and system controls to the mains
supply must be through a common isolator and must be fused
at 3A, maximum. This method of connection must be by a fused
double pole isolating switch, with a minimum contact separation
of 3mm on both poles. The switch should be readily accessible
and preferably adjacent to the appliance. It should supply the
appliance only and be easily identifiable as so doing.
Alternatively, an unswitched shuttered socket outlet and 3A
fused 3 pin plug, both to the current issue of BS1363 may be
used provided that they are not used in a room containing a bath
or shower.
Wiring to the boiler must be PVC 85oC insulated cable, not less
than 0.75mm2(24/0.20mm).
Manual Handling Guidance
During the appliance installation it will be necessary to employ
caution and assistance whilst lifting as the appliance 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.
Heating System Controls
The heating system must be controlled as described in the
relevant part of the current issue of :
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.
3) The domestic heating and hot water guide to the building
regulations 2001.
Thermostatic radiator valves may be installed, however they
must not be fitted in a room where the room thermostat is
located.
Air in the heating system
Persistent air in the heating system may indicate leaks in the
system or corrosion taking place. Call your Installation/Servicing
company.
Protection Against Freezing
The appliance has a built in frost protection programme as long
as the electricity and gas are left switched on.
This device operates the burner and system pump when the
temperature inside the boiler falls below 60C.
Any other exposed areas of the system should be protected by
a separate frost thermostat.
Important Information

54000124050-2
Draining and Filling
Appliance Introduction
Diagram 1
BOILER DRAIN
VALVE
9744
The F24E and F18E SB boilers are wall mounted modulating
boilers with electronic ignition providing central heating and
hot water.
The boiler is of the II2H3+ category and is for use with natural
Gas (G20) as distributed in the United Kingdom, but can be
converted to use Butane (G30), Propane (G31) with the
appropriate kit.
Thema Classic F24E LPG boilers are factory set for use
on Butane (G30) and Propane (G31) without requirement
for any additional adjustments.
The boiler has a fan assisted balanced flue which both
discharges the products of combustion to and draws the
combustion air from the outside of the room.
This boiler is not suitable for outdoor installation.
This boiler may be installed in any room, although particular
attention is drawn to the installation of a boiler in a room
containing a bath or shower where reference must be made to
the relevant requirements.
Any electrical switch or boiler control utilising mains electricity
should be placed so that it cannot be touched by a person
using the bath or shower.
In GB this is the current I.E.E. WIRING REGULATIONS and
BUILDING REGULATIONS.
➜
(a)
(b)
(c)
bar
0.5
1
1.5
2
2.5
3
3.5
35
45
55
65
75
Caution: The boiler is installed as part of a sealed system
which must only be drained and filled by a competent person.
If the mains electricity and gas are to be turned off for any long
periods during severe weather, it is recommended that the
whole system, including the boiler, refer to diagram 1, should
be drained to avoid the risk of freezing. Make sure that, if fitted,
the immersion heater in the cylinder is switched off.
If in doubt, consult your servicing company.
F24E Only
• If the boiler loses water: the pressure will be indicated, see
diagram 1 (a) and the boiler ON indicator (b) will flash red
indicating a fault. Fill the system by the filling device (c) at the
bottom of the boiler until the pressure gauge reads 1.0 bar.
A mains inlet pressure of 2.0 bar is required to reach a fill
pressure of 1.0 bar.
Reset boiler: refer to diagram 2, turn the On/Off switch to (0),
wait for five seconds. Turn the On/Off switch to ( I ) to reset the
appliance.
F18E SB Only
• If the boiler loses water: the pressure will be indicated, see
diagram 1 (a) and the running lamp (b) will flash red indicating
a fault. Fill the system with the external filling device until the
pressure gauge reads 1.0 bar.
Reset boiler: refer to diagram 2, turn the On/Off switch to (0),
wait for five seconds. Turn the On/Off switch to ( I ) to reset the
appliance.
• Warning: Take care not to overfill the boiler. At a pressure of
2.5 bar or above indicating over pressure, the boiler ON
indicator (b)will flash red indicating a fault. The pressure must
be reduced to 1.0 bar by opening the drain valve, refer to
diagram 1. If the fault continues call the relevant Servicing
organisation or Saunier Duval Service using the telephone
number on the inside front cover of this literature.
In IE reference should be made to the current edition of I.S.813
"Domestic Gas Installations" and the current ETCI rules.
The central heating and domestic hot water (F24E only)
temperatures are user adjustable.
F24E Only. Domestic hot water demand always has priority
over heating demand.
The boiler is designed for use as part of a sealed water central
heating system with fully pumped circulation. The pump,
expansion vessel and associated safety devices are all fitted
within the boiler.
The boiler can be installed against either an external wall or on
an adjacent inside wall, that is, the flue system will pass directly
to the rear or to either side to the terminal fitted on the outside
wall face.
These instructions should be carefully followed for the safe and
economical use of your boiler. The 'User Controls and Lighting'
section describes how to safely use the boiler.
Note: The boiler serial number is marked on the data label
attached to the rear of the control box.
Accessories
A range of accessories are available.
For further information contact your supplier.

6
4000124050-2
Appliance Safety Devices
Maintenance and Servicing
Air flow rate safety device
If the flue is obstructed, the built in safety system will turn the
boiler OFF, the fan will continue to run. The boiler will be ready
to operate when the fault has been cleared.
Overheating safety
In the event of the boiler overheating the safety devices will
cause a safety shutdown. If this happens, call your Installation/
Servicing company.
Electrical supply failure
The boiler will not operate without an electrical supply. Normal
operation of the boiler should resume when the electrical
supply is restored.
Reset any central heating system controls, to resume normal
operation.
If the boiler does not resume normal operation turn the mains
reset switch off and on. If the boiler does not resume normal
operation it is advisable to consult your installation / servicing
company.
Cleaning
WARNING:This appliance contains metal parts (components)
and care should be taken when handling and cleaning with
particular regard to edges of sheet metal parts to avoid any
possibility of personal injury.
The boiler casing can be cleaned with a damp cloth, followed
by a dry cloth to polish.
Do not use abrasive or solvent cleaners.
Maintenance and Servicing
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, but in general once a year should
be enough, refer to guarantee registration on the inside front
cover of this literature.
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.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
To obtain service, please call the relevant service organisation
or Saunier Duval Service using the telephone number on the
inside front cover of this literature.
Please be advised that the ‘Benchmark’ logbook should be
completed by the 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
benchmark Logbook. You can check your installer is CORGI
registered by calling CORGI direct on: 00 44 (0) 1256 372300.
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.
If a part or advice is required contact the relevant service
organisation or Heatcall using the telephone number on the
inside front cover of this booklet.
Please quote the name of the appliance, this infomation will be
on the name badge on the front of the appliance.
Frost protection
The appliance has a built in frost protection device that
protects the boiler from freezing. With the gas and electric
supplies ON and irrespective of any room thermostat setting,
the frost protection device will light the boiler when the
temperature of the boiler water falls below 6°C.
When the temperature reaches 16°C, the boiler stops.
Any other exposed areas of the system should be protected by
a separate frost thermostat.
Heating safety valve
CAUTION:A heating safety valve with a discharge pipe is fitted
to this boiler.
The valve MUST NOT BE TOUCHED except by a competant
person. If the valve discharges at any time, switch the boiler off
and isolate it from the electrical supply. Contact your installation/
service company.

74000124050-2
User Controls and Lighting
11880
1. Lighting the boiler :
Make sure that:
• The boiler is connected to the electrical supply.
• The gas service cock is open.
• The room thermostat is calling for heat (if fitted).
• Turn the On/Off switch to ON ( I )
• The boiler ON indicator will illuminate green.
2. Stop the boiler :
• Turn the On/Off switch to OFF ( 0 ) the
electrical supply is OFF.
1
2
3
4
5
6
3. Domestic hot water adjustment
(F24E Only) :
• Position ( 0 ): Domestic hot water
OFF
• Position ( I ) and ECO: Domestic
hot water between approx. 38˚C
and 50˚C
• ECO: Maximum recommended
for constant use
• Between ECO and maxi:
Occasional use for water above
approx. 50˚C
4. Heating temperature adjustment :
• Winter: Set the control knob
between 1 and 5 (Heating ON)
• Summer: Set the control knob
to (Heating OFF)
1
On/Off
switch
Pressure gauge (bar)
and temperature
gauge (°C)
Boiler ON indicator
(fault indicated by
light flashing red)
Programmer
(F24E Only).
Central heating temperature selector
minimum setting (approx. 38˚C) up to
maximum setting (approx. 73°C).
Domestic hot water temperature selector (F24E Only)
minimum setting approx. 38˚C up to maximum setting 60˚C.
The ECO setting is ideally suited for all the requirements of normal family use
(showers, washing up etc.). The maximum setting should be reserved for occasional use
when very hot water is required.
Diagram 2
5. If a fault occurs (indicated by
red flashing light) :
• Reset boiler: Turn the On/Off switch to ( 0 ),
wait for five seconds. Turn the On/Off switch to (I)
the boiler is reset. If the fault continues call your
Installation/Servicing company or Saunier Duval
Service using the telephone number on the inside
front cover of this literature.
1
5
3
2
6. Pressure gauge:
• The boiler pressure gauge will show a reading
between 1.0 and 1.5 bar.
Refer to Section Draining and Filling if required.
4
5

8
4000124050-2
Programmer Instructions for Use
Analogue Programmer (F24E Only)
Part No. A20086. Fitted as standard.
Setting the time, see diagram 3
• Rotate the dial clockwise, by hand, until the indicator arrow
is pointing to the current time.
Note: The time is set in 24 hour format.
Setting the programme “on and off” times, see diagram 3
• Select the on times by pushing the black tappets to the
outside.
• Select the off times by pushing the black tappets to the
inside.
To override or advance the programmer
The clock has a manual on/off switch which operates as
follows:
Upper position I:Heating on continuously
Middle position :Heating on timed
Lower position 0:Heating off
Digital Programmer Kit. (F24E Only)
Part No. A20087. Not fitted as standard.
KEYPAD DESCRIPTION
See diagram 4 for position of keypads as described below,
Time/Automatic Run Mode selection
Prog. Programme selection
Res.* Reset clears all settings
ON/OFF selector in Prog. Mode, Manual Override selector
in Run Mode
±1h* Summer/Winter time setting
hSets the Hour (12: - - AM)
mSets the Minute (- -: 01 AM)
Day Sets Day(s) for time and programmes
*Recessed keys; use a pen point to press
11460
Diagram 3
To override or advance the programmer
BLACK TAPPETS
INDICATOR
ARROW
OFF
TIMES
ON TIMES
Diagram 4
LCD Display
The LCD incorporates a number of different elements to display
various data and information.
Programmes
The Digital Programmer will accept up to 20 events
Each event consists of:
1. An ON or OFF command
2. Time of day (Hour and Minute)
3. Single day or multiple days
An event is required for each ON and OFF.

94000124050-2
Programmer Instructions for Use
NOTE: MULTIPLE ON OR OFF EVENTS MAY BE
PROGRAMMED, SEE EXAMPLE.
BEFORE PROCEEDING WITH SETTING THE TIME AND
PROGRAMMING THE UNIT, PRESS THE RESET KEY TO
CLEAR ALL DATA FROM THE MEMORY.
Selecting AM/PM or 24 Hour Time
After pressing reset, the display may show AM (below). The
numbered day symbols will be flashing on and off.
If the display does not show AM, it is in 24 hour time. To change
to AM/PM mode, press and hold the hkey and press the ±1h
key once. AM will appear in display.
If display is in AM/PM mode and 24 hour time mode is desired,
press and hold the hkey, press the ±1h key once.
Programming 24 Hour or 7 Day Schedules
It may be helpful to write out the programme schedules before
beginning.
THE CURRENT TIME OF DAY AND DAY OF WEEK MUST BE
SET PRIOR TO PROGRAMMING. SEE "SETTING THE TIME"
Example
Event 1: ON at 7:00AM Monday through Saturday
Event 2: OFF at 5:00PM Monday through Friday
Event 3: OFF at 7:00PM Saturday
Three events need to be entered.
Press Prog. key only once. Display shows:
Setting the Time
IF THE hAND mKEYS ARE HELD DOWN LONGER THAN 2
SECONDS, THE NUMBERS WILL ADVANCE RAPIDLY.
Press and hold the key during the following:
(If British Summer Time is in effect, press ±1h first)
1. Press hto advance to the current hour
(while holding down the key)
2. Press mto advance to the current minute
(while holding down the key)
3. Press Day repeatedly to advance to current day
(while holding down the key)
Day Key Selections
Press Day Key Display Shows Days
0 times 1 2 3 4 5 6 7 Every Day
1 time 1 2 3 4 5 6 Mon.–Sat.
2 times 1 2 3 4 5 Mon.–Fri.
3 times 6 7 Sat. & Sun.
4 times 1 Monday
5 times 2 Tuesday
6 times 3 Wed.
7 times 4 Thursday
8 times 5 Friday
9 times 6 Saturday
10 times 7 Sunday
NOTE: If the days are flashing, it indicates the day of the week
was not set when setting the time. The timer cannot be
programmed unless the day of the week is entered.
Manual GMT/BST Time Changeover
Each year, in the Spring, press ±1h to advance the time an
hour. In the Autumn, press ±1h to set back an hour.
Event 1 (ON at 7:00AM Monday through Saturday)
Press key once. ON symbol appears
Press h key to 07AM
Press m key once to 00
Press Day key once 1 2 3 4 5 6 is displayed
Press Prog. key to enter
Event 2 (OFF at 5:00PM Monday through Friday)
Press key twice. OFF symbol appears
Press h key to 05PM
Press m key once to 00
Press Day key two times 1 2 3 4 5 is displayed
Press Prog. key to enter
Event 3 (OFF at 7:00PM Saturday)
Press key twice. OFF symbol appears
Press h key to 07PM
Press m key once to 00
Press Day key 9 times until only 6 is displayed
Press Prog. key to enter
Press key to enter Run Mode
IF AN "ON" TIME WAS PROGRAMMED THAT IS EARLIER IN
THE DAY THAN THE CURRENT TIME, PRESS ONCE TO
TURN THE TIMER "ON". (IT DOES NOT "LOOK BACK" TO
DETERMINE IF IT SHOULD BE ON OR OFF AFTER
PROGRAMMING).
IF 24 HOUR TIME CONTROL (SAME SCHEDULE EVERY DAY
OF THE WEEK) IS DESIRED, IGNORE Day KEY.
If an ON or OFF symbol is not entered, the ON symbol will flash,
and programme will not be accepted.

10
4000124050-2
Programmer Instructions for Use
Event Review
To review the programs at any time, press Prog.key. Events will
appear in the order they were entered with repeated presses of
the Prog. key. After all events have been reviewed, the blank
display will appear to allow entering another event. Another
press of the Prog. key will display the number of free events
available, such as Fr 16 if 4 events have been entered.
Manual Override
While in the Run Mode, pressing the key once will reverse
the current mode; ON to OFF or OFF to ON. The symbol
appears in the display to indicate a temporary override.
At the next scheduled switching time, automatic control
resumes, eliminating the override.
CONTINUOUS OPERATION: While in the Run Mode, press
the key twice to turn the output to permanently ON.
symbol appears in display.
Pressing the key three times will turn the output OFF
permanently. symbol appears in display.
To terminate a continuous override, press the key until
appears in the display.
Changing an Event
Select the event to be changed with the Prog. key. A new set
of days may be selected with the Day key just as in initial
programming.
Hours and minutes can be changed with the h and m keys.
Press Prog. or key to store the new programme.
Deleting an Event
To delete only one or a few events: Press Prog. key until the
desired program is displayed.
Press m key to :59 and press once more to blank out.
Press h key to 11PM and press once more to blank out.
Press key, display will flash for several seconds and then
enter the Run Mode. Using the reset key will delete ALL events,
the time of day, and day of the week.
Troubleshooting
PROBLEM: Days are flashing, pressing any key does nothing
except key turns output ON and OFF.
SOLUTION: TimeofDayand Day of Week have not been set.
See "SETTING THE TIME"
This is the condition after a reset. If the timer is found in this
condition after it has been installed, programmed and operating
for a while, it may indicate that interference has disrupted the
microprocessor causing a loss of programme information.
A second, but very unlikely cause of loss of programme is a
power failure with the backup capacitor low or dead. Check by
disconnecting power and monitoring how long the capacitor
keeps the time of day in the display. Typically, the capacitor will
maintain the time and programmes for 4 days, but not more
than 5 days.
PROBLEM: Time of day was set while holding the key
down, but days are still flashing.
SOLUTION: Current day of week was not set while holding
down the key. See "SETTING THE TIME"
PROBLEM: It is 10AM and an ON event for 8AM was entered,
but the output is not ON. Display shows the and
symbols.
SOLUTION: After programming, the timer does not "look back"
to determine if it should be ON. Press the key (temporary
override) to turn the output ON; appears in display.
The timer will assume automatic operation at the next
programmed event.
PROBLEM: An event for 8AM Monday through Friday was
entered,
but it will not accept it and is flashing.
SOLUTION: The ON or OFF was not entered as part
of the program. ON or OFF must be selected.

11 4000124050-2
1 Technical Data
Heat input (max) NET Q 26,94 kW
91,200 BTU/H
Heat input (min) NET Q 9,91 kW
33,820 BTU/H
Heat output (max) NET P 23,6 kW
81,550 BTU/H
Heat output (min) NET P 8,9 kW
30,370 BTU/H
Efficiency - Sedbuk D 78,3%
Maximum heating temperature 87° C
Expansion vessel effective capacity 5 litres
Expansion vessel charge pressure 0,5 bar
Maximum system capacity at 75°C 110 litres
Safety valve, maximum service pressure 3 bar
Heating
Heat input (max) NET Q 26,94 kW
91,200 BTU/H
Heat input (min) NET Q 9,91 kW
33,820 BTU/H
Heat output (max) NET P 23,6 kW
81,550 BTU/H
Heat output (min) NET P 8,9 kW
30,370 BTU/H
Maximum hot water temperature 60 °C
Minimum hot water temperature 38 °C
Specific flow rate (for 35°C temp rise) 9,8 litres/min.
Threshold flow rate 1,7 litres/min.
Maximum supply pressure 10 bar
Minimum supply pressure 0,5 bar
Hot water
Electrical supply 230 V ~ 50Hz
Electrical rating 122 W fused at 3A
Level of protection IPX4D
Fuse rating 125mA
Electrical
Products outlet diameter 60 mm
Fresh air inlet diameter 100 mm
Combustion products values CO (60 ppm)
CO2 (6,7%)
NOx (48ppm)
Combustion
Ø Burner injector 1,2 mm
Inlet pressure 20 mbar
Maxi. Burner pressure 12,2 mbar
Mini. Burner pressure 2,25 mbar
Gas rate maximum 2,74 m3/h
Gas rate minimum 1,16 m3/h
Natural Gas (G20)
Ø Burner injector 0,73 mm
Inlet pressure 29 mbar
Maxi. Burner pressure 23,2 mbar
Mini. Burner pressure 4,41 mbar
Gas rate maximum 2,01 kg/h
Gas rate minimum 0,87 kg/h
Butane Gas (G30)
Ø Burner injector 0,73 mm
Inlet pressure 37 mbar
Maxi. Burner pressure 29,8 mbar
Mini. Burner pressure 5,4 mbar
Gas rate maximum 2,01 kg/h
Gas rate minimum 0,83 kg/h
Propane Gas (G31)
Heat input (max) NET Q 21,9 kW
74,722 BTU/H
Heat input (min) NET Q 11 kW
37,532 BTU/H
Heat output (max) GROSS P 19,8 kW
67,556 BTU/H
Heat output (min) GROSS P 9,2 kW
31389 BTU/H
Efficiency - Sedbuk D 78,8%
Maximum heating temperature 87° C
Expansion vessel effective capacity 5 litres
Expansion vessel charge pressure 0,5 bar
Maximum system capacity at 75°C 110 litres
Safety valve, maximum service pressure 3 bar
Ø Burner injector 1,2 mm
Inlet pressure 20 mbar
Maxi. Burner pressure 8,82 mbar
Mini. Burner pressure 2,25 mbar
Gas rate maximum 2,3 m3/h
Heating
Electrical supply 230 V ~ 50Hz
Electrical rating 122 W fused at 3A
Level of protection IPX4D
Fuse rating 1,25mA
Natural Gas (G20)
Electrical
Products outlet diameter 60 mm
Fresh air inlet diameter 100 mm
Combustion products values CO (30 ppm)
CO2 (5,9%)
NOx (76 ppm)
Combustion
Ø Burner injector 0,73 mm
Inlet pressure 29 mbar
Maxi. Burner pressure 17,65 mbar
Mini. Burner pressure 4,41 mbar
Gas rate maximum 1,72 kg/h
Gas rate minimum 0,87 kg/h
Butane Gas (G30)
Ø Burner injector 0,73 mm
Inlet pressure 37 mbar
Maxi. Burner pressure 22,52mbar
Mini. Burner pressure 5,4 mbar
Gas rate maximum 1,70 kg/h
Gas rate minimum 0,83 kg/h
Propane Gas (G31)
F24E F18E SB

12
4000124050-2
1 Technical Data
The F24E and F18E SB are delivered in
two separate packages:
• The boiler including hanging bracket
complete with isolating valves and fittings.
• The flue system.
9699
Diagram 1.1
Net lift weight (boiler only)
F24E 34 kg
F18E SB 32 kg
Gross lift weight
(boiler, hanging bracket
isolation valves and packaging)
F24E 35 kg
F18E SB 33 kg
2 General Information
IMPORTANT NOTICE.
Where no British Standards exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Refer to Manual Handling Operations, 1992 regulations.
The installation of this boiler must be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
2.1 Sheet Metal Parts
WARNING:When installing the appliance, care should be taken
to avoid any possibility of personal injury when handling sheet
metal parts.
2.2 Statutory Requirements
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force.
In GB the installation of the boiler MUST be carried out by a
competent person as discribed in the following regulations:
Manufacturer’s instructions, supplied.
The Gas Safety (Installation and Use) Regulations.
The appropriate Building Regulations, either The Building
Regulations, The Building Regulations (Scotland), The building
Regulations (Nothern Ireland).
The Water Fittings Regulations or Water Bylaws in Scotland.
The Health and Safety at Work Act, Control of Substances
Hazardous to Health (COSHH).
The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In I.E the installation must be carried out by a competent person
and installed in accordance with the current edition of I.S. 813
"Domestic Gas Installations", the current Building Regulations
and reference should be made to the current ETCI rules for
electrical installation.
In GB the following Codes of Practice apply:
BS4814, BS5440 Part 1 and 2, BS5449, BS5546 Part 1, BS6700,
BS6798, BS6891 and BS7074 Part 1 and 2, BS7478, BS7593,
BS7671.
In IE: I.S.813, BS5546, BS5449, BS7074, BS7593.
Manufacturer’s notes must not be taken as overriding statutory
requirements.
BSI Certification
This boiler certificated to the current issue of EN 483 for
performance and safety.
It is important that no alteration is made to the boiler, without
permission, in writing, from Hepworth Heating Ltd.
Any alteration that is not approved by Hepworth Heating Ltd.,
could invalidate the warranty and could also infringe the current
issue of the Statutory Requirements.

13 4000124050-2
2.3 Gas Supply
The gas installation must be in accordance with the relevant
standards.
In GB this is BS 6891.
In IE this is the current edition of I.S.813 "Domestic gas
installation".
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.
Important Notice
If your boiler has been converted to use L.P.G. Propane the
following note applies:
Propane cylinders are under pressure and should never be
stored or used indoors residentially.
They should only be kept outside.
Under no circumstances should L.P.G. Propane cylinders be
fitted or stored in basement areas or boiler houses.
On completion, test the gas installation for soundness using the
pressure drop method and suitable leak detection fluid, purge in
accordance with the above standard.
50
40
30
20
10
0 500 1000
1
2345
9700
Flow rate through heating system (I/h)
(10 kPa = 1 m WG)
1
2
3
4
5
Bypass fully shut
Open 1/4 turn
Open 1/2 turn
Open 1 turn
Open 2 turns
Available pressure (kPa)
Diagram 3.1
3 Heating System Design
2 General Information
The installation of the boiler must comply with the requirements
of the current issue of BS6798, in Ireland, refer also to the
current edition of I.S.813"Domestic Gas Installations".
In GB it is necessary to comply with the Water Supply (Water
Fittings) Regulations 1999 (for Scotland, the Water Byelaws
2000, Scotland).
To comply with the Water Regulations your attention is drawn
to: The Water Regulations guide published by the Water
Regulation Advisory Service (WRAS) which gives full details of
the requirements.
In IE the requirements given in the current edition of I.S.813
"Domestic Gas Installations" and the current Building
Regulations must be followed.
• The F24Eand F18ESB are for use with sealed central heating
systems.
• Heating surfaces may consist of radiators, convectors or fan
assisted convectors.
• The safety valve is an integral part of the boiler and it cannot
be adjusted.
• The circulation pump is integral with the boiler.
• Pipe sectional areas shall be determined in accordance with
normal practices, using the output/pressure curve
(diagram 3.1). The distribution system shall be calculated in
accordance with the output requirements of the actual system,
not the maximum output of the boiler. However, provision shall
be made to ensure sufficient flow so that the temperature
difference between the flow and return pipes be less than or
equal to 20°C. The minimum flow rate is shown in table 1.
• The system can be fitted with a lockable control valve if
necessary in the main flow or return pipes shown as valve 'A'
in diagram 3.2.
• The piping system shall be routed so as to avoid any air
pockets and facilitate permanent venting of the installation.
Bleed fittings must be provided at every high point of the
system and on all radiators.
• The total volume of water permitted for the heating system
depends, amongst other things, on the static head in the cold
condition. The expansion vessel on the boiler is pressurised at
0.5 bar and allows a maximum system volume of 110 litres for
an average temperature of 75°C and a maximum service
pressure of 3 bar. This pressure setting can be modified at
commissioning stage if the static head differs. An additional
expansion vessel can be fitted to the system if required, see
diagram 3.2.
Guidance on vessel sizing is also given in a current issue of a
BS5449 and BS7074 Part 1, for IE refer to the current edition
of I.S.813 "Domestic Gas Installations".
• Provision shall be made for a drain valve at the lowest point
of the system.
• Where thermostatic radiator valves are fitted, not all radiators
must be fitted with this type of valve, and in particular, where
a room thermostat is installed.
• In the case of an existing installation, it is ESSENTIALthat the
system is thoroughly flushed prior to installing the new boiler,
using a proprietary product from Fernox or Sentinel.

14
4000124050-2
Control
valve
Flow
Drain
point
Bypass
valve
D
omestic
water
Heating
circuit
Return
Additiona
l
expansion
vessel
(if require
d)
Hot water out
Cold supply in
Drain
point
Boiler
Filling device
9898
Additional
Bypass valve
(if required)
*
*
Control
valve
Flow
D
rain
p
oint
Bypass
valve
Heating
circuit
Return
Additiona
l
expansion
vessel
(if require
d)
Boiler
Diagram 3.2
10157
F24E
F18E SB
'A'
Additional
Bypass valve
(if required)
*
*
'A'
TEMPORARY
CONNECTION
HOSE
UNION
HOSE
UNION
SUPPLY
PIPE
CONTROL
VALVE
CONTROL
VALVE
DOUBLE
CHECK
VALVE
BOILER
RETURNFLOW
HEATING
CIRCUIT
DRAIN
POINT
SUPPLY
PIPE
AIR GAP
TUNDISH
CONTROL
VALVE CONTROL
VALVE
TYPE CA BACKFLOW
PREVENTION DEVICE
BOILER
RETURNFLOW
HEATING
CIRCUIT
DRAIN
POINT
Method 1
Method 2
Diagram 3.3
11593
3.1 Bypass
• The boiler is fitted with an adjustable automatic bypass.
Ensure that under no circumstances does the flow rate drop
below the figure specified, see table 1.
• A system bypass is not required on the central heating circuit
unless the system controls will not ensure aminimum water flow
rate.
• Where a bypass has to be fitted, the bypass must be placed
at least 1.5 metres away from the appliance, seediagram 3.2.
3.2 Filling the system F24E.
• An integral filling device is fitted to the boiler to initially fill the
system and replace water lost during servicing, seetherelevant
parts of diagram 2 controls and lighting and diagram 1.
3 Heating System Design
TABLE 1. FLOW RATE
Model Minimum flow rate
This is equal to 20°C differential at maximum
heat input.
F24E 16.94 litres per minute
F18E SB 13.21 litres per minute
3.3 Filling the system F18E SB.
• Provision for filling the system must be made. The methods
are shown in diagram 3.3. There must be no permanent
connection to the mains water supply, even through a non-
return valve.
NOTE: It is important that fittings used for connection to
potable water comply with the water undertakings requirements.

15 4000124050-2
General- All domestic hot water circuits, connections, fittings
must be in accordance with the relevant standards and water
supply regulations.
For GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulation Guide.
For IE: The current edition of I.S.813 "Domestic Gas
Installations".
• Copper tubing or plastic Hep20 may be used for the domestic
hot water system. Unnecessary pressure losses should be
avoided.
• Provision shall be made for a drain valve at the lowest points
of the system.
• The flow restrictor, supplied in the document envelope, must
be fitted as diagram 7.1, limiting the flow through the boiler to
a maximum of 10 litres/min.
• The boiler will operate with a minimum supply pressure of 0.5
bar, at a reduced flow rate.
Best operating performance will be obtained from a supply
pressure of 1 bar or greater.
4.1 Hard Water Areas
In areas where the water is 'hard', more than 200mg/litre, it is
recommended that a proprietary scale reducer is fitted in the
cold water supply to the boiler.
4 Domestic Hot Water System Design. F24E Only

16
4000124050-2
1 - Fan.
2 - Air pressure switch.
3 - Heat exchanger.
4 - Overheat thermostat.
5 - Combustion chamber.
6 - Expansion vessel.
7 - Flame sense electrode.
8 - Burner.
9 - Ignition electrode.
10 - Pump.
11 - Heating thermistor.
12 - Ignition unit.
13 - By-pass.
14 - Gas control valve.
15 - Loss of water sensor.
16 - Heating filter.
17 - Discharge safety valve (3bar).
A - Heating return.
B - Heating flow.
C - Gas.
Diagram 5a.1
11450
FITTED TO
REAR OF
APPLIANCE
5a Boiler Schematic F18E SB
1 - Fan.
2 - Air pressure switch.
3 - Heat exchanger.
4 - Overheat thermostat.
5 - Combustion chamber.
6 - Expansion vessel.
7 - Flame sense electrode.
8 - Burner.
9 - Ignition electrode.
10 - Pump.
11 - Heating thermistor.
12 - Ignition unit.
13 - By-pass.
14 - Gas control valve.
15 - Loss of water sensor.
16 - Domestic heat exchanger
17 - 3 way valve
18 - Domestic water flow sensor
19 - Filter cold water inlet
20 - Filling system
21 - Discharge safety valve (3bar)
22 - Drain valve
23 - Heating filter
A - Heating return
B - Cold water inlet
C - Heating flow
D - Domestic hot water outlet
E - Gas
5 Boiler Schematic F24E
9899
FITTED TO
REAR OF
APPLIANCE
Diagram 5.1
ABC

17 4000124050-2
6 Boiler Location, Flue and Ventilation
6.1 Boiler Location
The recommended clearances are shown in diagram 6.1.
Note: The boiler must be mounted on a flat wall which is
sufficiently robust to take its weight when full. If in doubt, expert
advice should be obtained, in the event of the wall being found
not suitable.
The minimum acceptable spacings from the terminal to
obstructions, other terminals and ventilation openings are
shown in diagram 6.2. For Ireland the minimum distances for
the flue terminal positionning must be those detailed in I.S.813
"Domestic Gas Installations".
The boiler must be installed so that the terminal is exposed to
the external air.
6.2 Terminal guard, see diagram 6.3.
A terminal guard is required if persons could 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 to be central over the terminal.
A suitable terminal guard type K3 can be supplied by:
Tower flue components Ltd.
Morley road
Tonbridge
Kent
TN9 1RA
6.3 Flue options
There are various flue systems to choose from as follows:
Horizontal telescopic top flue pack.
Horizontal top flue pack.
Vertical flue pack.
Twin flue pack.
Extensions, 90° and 45° bends.
For detailed information refer to flue options guide. This is
available from your nearest stockist.
6.4 Cupboard or compartment ventilation
The boiler can be fitted in a cupboard or compartment without
the need for permanent ventilation.
Diagram 6.2
MINIMUMSITINGDIMENSIONSFORTHE
POSITIONING OF FLUE TERMINALS MM
HORIZONTAL FLUES
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 75
CBELOW EAVES 200
DBELOW A BALCONY OR CAR PORT 200
EFROM VERTICAL DRAIN PIPES AND
SOIL PIPES 150
FFROM INTERNAL/EXTERNAL CORNERS
OR TO A BOUNDARY ALONGSIDE THE
TERMINAL 300
GABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
HFROM SURFACE OR A BOUNDARY
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
VERTICAL FLUES
MFROM ADJACENT WALL TO FLUE 300
NFROM ANOTHER TERMINAL 600
PFROM ADJACENT OPENING WINDOW 1000
QABOVE ROOF LEVEL 300
11508
Diagram 6.3
*Note: It is permissible to
install the boiler with smaller
clearances than those quoted
PROVIDING that consideration
is given for Servicing/Repairs. Diagram 6.1
11652
20mm
*
5mm
20mm
*5m
m
300mm
600mm
*450mm
25mm
above
elbow

18
4000124050-2
7 Fixing Jig
The fixing jig is made up as follows:
A - Heating return fitting with isolating valve.
B (F24E Only) - Cold water inlet fitting with isolating
valve (m). The cold water inlet restrictor supplied with
boiler is fitted when the boiler is installed. Refer to
Section 9.
C - Heating flow fitting with isolating valve.
D (F24E Only) - Domestic hot water outlet.
E - Gas service cock.
Diagram 7.1
Other components within the fixing jig pack.
F - Hanging bracket
G - wall template
J - sealing washers and screws
F24E shown

19 4000124050-2
8.1 Cutting the flue hole
• Remove the wall template, follow the instructions given on the
wall template.
• Position the wall template, taking due regard of the minimum
clearances for the selected flue application, see diagram 8.1.
• Rear hole cutting
• Mark correct position of Top Rear flue outlet hole from
template, then remove template, before cutting, for use, later.
• Side hole cutting
• Mark the horizontal centre line for the hole on the rear wall.
Extend the horizontal centre line to the side wall and mark the
vertical centre line of flue hole as shown in diagram 8.1.
IMPORTANT NOTE: When cutting the flue hole and when
extending the flue centre line to a side wall, remember that the
flue system must have a fall of about 35mm per metre of flue
downward towards the terminal. There MUST never be a
downward incline towards the boiler.
• Making allowance for the slope of the flue, cut hole in external
wall, preferably using a core drill. For installations with internal
and external access use a 105mm diameter core drill.
• For installations with internal access only use a 125 mm
diameter core drill.
8.2 Fixing jig, refer to diagram 7.1
•IMPORTANTNOTE:Ensure that the hanging bracket is fitted
to a flat and true wall area for correct alignment with the boiler.
SideFlue- Check the horizontal centre line and reposition the
template if necessary.
Rear Flue - Reposition the wall template over the hole in wall.
• Mark the securing position holes.
• Check that the hanging bracket is level.
• Drill, plug and secure the bracket to the wall, using suitable
screws (not supplied) for the wall type and capable of supporting
the total weight of the appliance (refer to wall template for fixing
points).
8.3 Water connection
IMPORTANTNOTE:Do not subject the isolating valves to heat
from blowlamp, when making connection.
Connect the system pipework to the fixing jig connection pipes
and the fixing jig isolating valves, observing the correct flow and
return as shown in diagram 8.1.
8.4 Gas connection
Gas Safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law that ALL gas
appliances are installed and serviced by a competent person
in accordance with the above regulations.
• The whole of the gas installation, including the meter, should
be inpected, tested for soundness and purged in accordance
with the current issue of BS6891 and in IE the current edition
of I.S.813 "Domestic Gas Installations".
8 Piping System Installation
Diagram 8.1
F24E shown

20
4000124050-2
Diagram 9.1
9 Boiler Installation
9.1 Sheet metal parts
WARNING: When installing or servicing this boiler, care should
be taken when handling the edges of sheet metal parts to avoid
the possibility of personal injury.
9.2 Installing the boiler
IMPORTANT NOTE: The system must be thoroughly flushed
using a propriety cleanser from Fernox or Sentinel to eliminate
any foreign matter and contamination e.g. metal filings, solder
particles, oil, grease etc.
Solvent products could cause damage to the system.
• Remove front panel, unscrew and remove the two retaining
screws from the bottom of the front panel. Remove front panel
by lifting up and forward.
• To remove the self adhesive wiring diagram label from the
document envelope. Fit the self adhesive wiring diagram label
to the inside of the front panel, put front panel in a safe place
to avoid damaging it.
DISCHARGE
SAFETY VALVE
PIPE
KNURLED
UNION NUT
finger tighten only
Diagram 9.2
10088
FILLING LOOP
EXTENSION
FILLING DEVICE
F24E Only
• If fitted ensure the plastic plugs are removed from water
andgaspipes. NOTE:Therewill besomespillageofwater.
• (F24E Only) Fit the cold water inlet restrictor (supplied in the
document envelope) into cold water inlet isolating valve, see
diagram 7.1.
Important Note. With regards to the manual handling
operations, 1992 regulations, the following operation exceeds
the recommended weight for one man lift.
• Lift the boiler up and engage boiler onto the hanging bracket,
refer to diagram 7.1.
• Fit the boiler connection pipes and washers between the boiler
and isolating valves, see diagram 7.1.
9.3 Discharge safety valve (diagram 9.1)
The discharge safety valve pipe and sealing washer supplied
in the connections pack, when fitted to the safety valve, will
extend the valve below the boiler. The discharge pipe must be
extended using pipe not less than 15 mm o.d. to discharge in
a visible position outside the building, facing downward
preferably over a drain.
IMPORTANTNOTE:Tofacilitateservicingoftheappliance,
the discharge pipe MUST ONLY be extended using a
compression fitting supplied.
The pipe must have a continuous fall and be routed to a
position so that any discharge of water, possibly boiling or
steam, cannot create any danger to persons, damage to
property or external electrical components and wiring. Tighten
all pipe connection joints.
9.4 Filling loop extension knob F24E Only
The filling loop extension knob is supplied in the discharge
safety valve pipe connection pack. Fit to the filling device on/
off knob, this is a push fit, see diagram 9.2.
9.5 Filling loop extension knob F18E SB
The filling loop extension is not required for this boiler, it can be
discarded.