Saunier duval THEMA CLASSIC F18E SB, THEMA CLASSIC F24E User Manual

4000124050-2 10.03

Instructions for Use

Installation and Servicing

To be left with the user

Themaclassic

F24E

Fanned Flue Combination Boiler

G.C.No. 47-047-35

Themaclassic

F18E SB

Fanned Flue System Boiler

G.C. No.41-920-35

Hepworth Heating Ltd., Nottingham Road, Belper, Derbyshire. DE56 1JT

F24E shown

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

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

the document envelope.

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:

4000124050-2

Tel. [phone]

General and Sales enquiries :

Tel. [phone]

Fax. [phone]

(0)

2

Contents

CONTENTS DESCRIPTION SECTION PAGE No.

Important Information 4
Draining and Filling 5

INSTRUCTION

FOR USE

INSTALLATION

INSTRUCTIONS

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

SERVICING

INSTRUCTIONS

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

3

4000124050-2

Important Information

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 suscepti­ble to irritation. High dust levels are usual only if the material
is broken.
Normal handling should not cause discomfort, but follow
normal good hygiene and wash your hands before eating,
drinking or going to the lavatory.
If you do suffer irritation to the eyes or severe irritation to the
skin seek medical attention.
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 85
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 6

Any other exposed areas of the system should be protected by
a separate frost thermostat.

o

C insulated cable, not less

0

C.

4000124050-2

4

Draining and Filling

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

BOILER DRAIN
VALVE

(b)

(a)

3.5

bar

75
65
55
45
35

➜

(c)

3

2.5
2

1.5
1

0.5

Diagram 1

organisation or Saunier Duval Service using the telephone
number on the inside front cover of this literature.

9744

Appliance Introduction

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 II
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.

category and is for use with natural

2H3+

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.

5

4000124050-2

Appliance Safety Devices

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.

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.

Maintenance and Servicing

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.

4000124050-2

6

User Controls and Lighting

Central heating temperature selector

minimum setting (approx. 38˚C) up to
maximum setting (approx. 73°C).

2

4

Pressure gauge (bar)

and temperature

gauge (°C)

3

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.

Boiler ON indicator

5

(fault indicated by
light flashing red)

On/Off
switch

6

Programmer
(F24E Only).

11880

1

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.

1

5

2. Stop the boiler :

• Turn the On/Off switch to OFF ( 0 ) the
electrical supply is OFF.

1

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

3

4. Heating temperature adjustment :

• Winter: Set the control knob
between 1 and 5 (Heating ON)

• Summer: Set the control knob

to (Heating OFF)

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.

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.

5

4

Diagram 2

7

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
Lower position 0 : Heating off

To override or advance the programmer

: Heating on timed

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
h Sets the Hour (12: - - AM)
m Sets the Minute (- -: 01 AM)
Day Sets Day(s) for time and programmes

*Recessed keys; use a pen point to press

11460

OFF
TIMES

ON TIMES

BLACK TAPPETS

INDICATOR
ARROW

Diagram 4

LCD Display

The LCD incorporates a number of different elements to display
various data and information.

Diagram 3

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.

4000124050-2

8

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 h key 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 h key, press the ±1h key once.

Setting the Time

IF THE h AND m KEYS ARE HELD DOWN LONGER THAN 2
SECONDS, THE NUMBERS WILL ADVANCE RAPIDLY.

Press and hold the
(If British Summer Time is in effect, press ±1h first)

1. Press h to advance to the current hour
(while holding down the

2. Press m to advance to the current minute
(while holding down the key)

3. Press Day repeatedly to advance to current day
(while holding down the

key during the following:

key)

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.

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:

Event 1 (ON at 7:00AM Monday through Saturday)

Press
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
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
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

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.

key once. ON symbol appears

key twice. OFF symbol appears

key twice. OFF symbol appears

key to enter Run Mode

9

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

Pressing the
permanently.

To terminate a continuous override, press the
appears in the display.

key twice to turn the output to permanently ON.

symbol appears in display.

key three times will turn the output OFF
symbol appears in display.

key until

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
SOLUTION: Time of Day and 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
down, but days are still flashing.

SOLUTION: Current day of week was not set while holding

down

PROBLEM: It is 10AM and an ON event for 8AM was entered,
but the output is not ON. Display shows the

SOLUTION: After programming, the timer does not "look back"
to determine if it should be ON. Press the

override) to turn the output ON;
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

SOLUTION: The ON
of the program. ON or OFF must be selected.

key turns output ON and OFF.

key

the key. See "SETTING THE TIME"

and

symbols.

key (temporary

appears in display.

is flashing.

or OFF was not entered as part

4000124050-2

10

1 Technical Data

F24E

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
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

Hot water

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

Combustion

Products outlet diameter 60 mm
Fresh air inlet diameter 100 mm
Combustion products values CO (60 ppm)

CO2 (6,7%)

NOx (48ppm)

Electrical

Electrical supply 230 V ~ 50Hz
Electrical rating 122 W fused at 3A
Level of protection IPX4D
Fuse rating 125mA

F18E SB

Heating

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

Combustion

Products outlet diameter 60 mm
Fresh air inlet diameter 100 mm
Combustion products values CO (30 ppm)

CO2 (5,9%)

NOx (76 ppm)

Electrical

Electrical supply 230 V ~ 50Hz
Electrical rating 122 W fused at 3A
Level of protection IPX4D
Fuse rating 1,25mA

Natural Gas (G20)

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

Natural Gas (G20)

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

Butane Gas (G30)

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

Propane Gas (G31)

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

Butane Gas (G30)

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

Propane Gas (G31)

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

11

4000124050-2

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.

Net lift weight (boiler only)
F24E 34 kg
F18E SB 32 kg

Gross lift weight
(boiler, hanging bracket
isolation valves and packaging)
F24E 35 k g
F18E SB 33 kg

1 Technical Data

9699

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).

Diagram 1.1

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.

4000124050-2

12

2 General Information

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.

3 Heating System Design

Bypass fully shut

1

Open 1/4 turn

2

Open 1/2 turn

3

Open 1 turn

4

50

40

30

20

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.

9700

1

2

3

4

5

10

Open 2 turns

5

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 F24E and F18E SB 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.

Available pressure (kPa)

0 500 1000

(10 kPa = 1 m WG)

Flow rate through heating system (I/h)

Diagram 3.1

• 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 ESSENTIAL that the
system is thoroughly flushed prior to installing the new boiler,
using a proprietary product from Fernox or Sentinel.

13

4000124050-2

D

l

d)

D
p

circuit

l

d)

3 Heating System Design

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, see diagram 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, see the relevant

parts of diagram 2 controls and lighting and diagram 1.

Additiona
expansion
vessel
(if require

omestic

water

Boiler

Filling device

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 non­return valve.

NOTE: It is important that fittings used for connection to
potable water comply with the water undertakings requirements.

TABLE 1. FLOW RATE

Model Minimum flow rate

F24E 16.94 litres per minute

F18E SB 13.21 litres per minute

This is equal to 20°C differential at maximum
heat input.

SUPPLY

PIPE

9898

BOILER

CONTROL

VALVE

11593

DOUBLE

CHECK

Hot water out

Cold supply in

Drain
point

Control

valve

Drain
point

Bypass

valve

*

'A'

Flow

Heating

circuit

Additional
Bypass valve

*

(if required)

Return

HEATING
CIRCUIT

Method 1

RETURNFLOW

CONTROL

VALVE

DRAIN
POINT

VALVE

HOSE

UNION

HOSE

UNION

TEMPORARY
CONNECTION

F24E

Boiler

Bypass

valve

Control

valve

'A'

*

Additiona
expansion
vessel
(if require

Additional
Bypass valve

*

(if required)

10157

BOILER

HEATING
CIRCUIT

RETURNFLOW

CONTROL

VALVE

TYPE CA BACKFLOW

PREVENTION DEVICE

CONTROL

VALVE

SUPPLY

AIR GAP

PIPE

rain

oint

F18E SB

4000124050-2

Flow

Heating

Return

Method 2

Diagram 3.2

14

DRAIN
POINT

TUNDISH

Diagram 3.3

4 Domestic Hot Water System Design. F24E Only

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 Hep
hot water system. Unnecessary pressure losses should be
avoided.

• Provision shall be made for a drain valve at the lowest points
of the system.

0 may be used for the domestic

2

• 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.

15

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 - 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

5 Boiler Schematic F24E

9899

FITTED TO
REAR OF
APPLIANCE

A - Heating return
B - Cold water inlet
C - Heating flow
D - Domestic hot water outlet
E - Gas

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).

Diagram 5.1

5a Boiler Schematic F18E SB

11450

FITTED TO
REAR OF
APPLIANCE

A - Heating return.
B - Heating flow.
C - Gas.

4000124050-2

ABC

Diagram 5a.1

16