200546-5.pmd

GENERAL

Classic

Slimline SE FF

Installation & Servicing

Boiler Size

SE9 FF

SE12 FF

SE15 FF

SE18 FF

Gas supply connection

(in. BSP)

Rc 1/2 (1/2) 1/2" (BSP Female)

Flow connection

22mm copper

Return connection

22mm copper

Maximum static water head

m (ft.)

30.5 (100)

Minimum static water head

m (ft.)

0.45 (1.5)

Electrical supply

230 V 50 Hz Boiler power consumption; 100W

Fuse rating

External; 3A Internal; F1A to BS.4265

Water content

litre (gal.)

2.7 (0.6)

3.65 (0.8)

Dry Weight

kg (lb)

37 (82)

42 (93)

Maximum installation weight

kg (lb)

30 (66)

34 (75)

Boiler size

Height

mm (in.)

700 (27.5)

Width

mm (in.)

380 (15.0)

Depth

mm (in.)

280 (11.0)

Flue duct diameter

mm (in.)

100 (4.0)

Flue duct length (max)

m (ft)

1.0 (3.3)

Note. Gas consumption is calculated using a
calorific value of 38.7 MJ/m

(1038 Btu/ft

)

gross or 34.9 MJ/m

(935 Btu/ft

) nett

To obtain the gas consumption at a different
calorific value:-

a. FOR L/S - divide the gross heat input (kW)

by the gross C.V. of the gas (MJ/m

)

b. FOR FT

/H - divide the gross heat input

(Btu/h) by the gross C.V. of the gas (Btu/ft

)

Table 1 - General Data

Table 2 - Performance Data

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 a notified body.

Boiler Size

SE9 FF

SE12 FF

SE15 FF

SE18 FF

Boiler input

10.8

14.5

17.85

21.9

Btu/h x 1000

36.8

49.3

61.0

74.7

Gas consumption

l/s

0.275

0.375

0.458

0.567

35.4

47.5

58.7

72.0

Boiler output

8.8

11.7

14.7

17.6

Btu/h x 1000

Burner Setting

mbar (in.w.g.)

12.6 (5.0)

11.0 (4.4)

12.7 (5.0)

14.0 (5.6)

pressure (HOT)

Seasonal Efficiency (SEDBUK) *

Band D

[80.4]%

[79.2]%

[80.6]%

[79.9]%

CAUTION.

To avoid the possibility of injury during the installation, servicing or cleaning

of this appliance, care should be taken when handling edges of sheet steel components

Key to symbols

= Ireland

GB = United Kingdom

PMS = Maximum operating pressure of water

= A room sealed appliance designed for connection via ducts to a

horizontal terminal, which admits fresh air to the burner and
discharges the products of combustion to the outside through
orifices which, in this case, are concentric. The fan is down
stream of the combustion chamber.

= An appliance designed for use on 2nd Family gas, Group H only.

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GENERAL

Classic

Slimline SE FF

Installation & Servicing

oiler

Page

Make and model ....................................................... 5
Appliance serial no. on data badge ....................... 13
SEDBUK No. % ......................................................... 4

Controls

Time and temperature control to heating ......... 25/26
Time and temperature control to hot water ...... 25/26
Heating zone valves .......................................... 25/26
TRV's ......................................................................... 9
Auto bypass ............................................................... 9
Boiler interlock .......................................................... 9

For all boilers

Flushing to BS.7593 ................................................. 9
Inhibitor ...................................................................... 9

Central heating mode
Heat input ................................................. to be calculated

For assistance see Technical Helpline on the back page

Page

Burner operating pressure ....... measure and record
Central heating flow temp. ........ measure and record
Central heating return temp. ..... measure and record

For combination boilers only

Scale reducer ......................................................... n/a

Hot water mode

Heat input ............................................................... n/a
Max. operating burner pressure ............................ n/a
Max. operating water pressure .............................. n/a
Cold water inlet temp ............................................. n/a
Hot water outlet temp. ............................................ n/a
Water flow rate at max. setting ............................... n/a

For condensing boilers only

Condensate drain .................................................. n/a

For all boilers:

complete, sign & hand over to customer

CONTENTS

Air Supply. ..................................................................... 9
Benchmark Commissioning Checklist ..................... 42
Boiler Clearances ......................................................... 7
Boiler Exploded View ................................................. 13
Burner Exploded View ............................................... .40
Control Box Exploded View ...................................... .40
Electrical Connections ............................................... 24
Electrical Regulations ................................................ 10
Extension Ducts - Fitting ............................................ 22
External Control .......................................................... 24
Fault Finding ................................................................ 37
Flue Installation ............................................................. 8

Rear installation ...................................................... 16
Side installation ....................................................... 19

Gas Safety ..................................................................... 6
Gas Supply .................................................................... 8
Initial Lighting . ............................................................ 27
Installation .................................................................. 13
Mandatory Requirements ............................................ 6
Pump ........................................................................... 10
Safe Handling ................................................................ 6
Servicing ..................................................................... 29
Short List of Parts ...................................................... 38
Spares Replacement ................................................. 31
System Diagrams ....................................................... 25
Terminal Guards. .......................................................... 8
Water and Systems ..................................................... 9
Water Treatment .......................................................... 9

Boiler size

G.C. Appliance No.

PI No.

(Benchmark No.)

SE9 FF

41-395-40

87 AP 107

SE12 FF

41-395-41

87 AP 107

SE15 FF

41-395-42

87 AP 107

SE18 FF

41-395-43

87 AP 107

classic Slimline SE FF

Natural Gas only

Destination Countries:

GB, IE

For GB, to comply with Building Regulations Part L1 (Part J in Scotland) the boiler should be fitted in accordance with the
manufacturer's instructions. Self-certification that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark Commissioning Checklist.

BENCHMARK COMMISSIONING CHECKLIST DETAILS

NOTE TO THE INSTALLER: COMPLETE

THE BENCHMARK COMMISSIONING

CHECKLIST AND LEAVE THESE

INSTRUCTIONS WITH APPLIANCE

For assistance see Technical Helpline on the back page

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GENERAL

Classic

Slimline SE FF

Installation & Servicing

INTRODUCTION

The Classic Slimline SE9 FF, SE12 FF, SE15 FF and SE18 FF is a
range of automatically fully controlled, wall mounted, balanced
flue, fanned gas boilers.
The heat exchanger is cast iron. The boiler casing is of white
enamelled mild steel.
The boiler casing has a removable controls pod containing a drop-
down door. The boiler thermostat is located behind the drop- down door.
Note. These boilers cannot be used on systems which include
gravity circulation. If gravity circulation is required the Classic SE
RS range of boilers is suitable.
See Frame 1 for details of the correct boiler tappings to use.
The boilers are supplied with a standard flue kit suitable for rear or
side outlet applications from 114 mm (4

1/2

") to 600 mm

(23

1/2

").

The boilers are suitable for connection to the following open
vented or sealed systems:

Fully pumped CH and indirect DHW
Pumped heating only.
Pumped indirect DHW only.

SAFE HANDLING

This boiler may require 2 operatives to move it to its installation
site, remove it from its packaging and during movement into its
installation location. Manoeuvring the boiler may include the
use of a sack truck and involve lifting, pushing and pulling.

Caution should be exercised during these operations.

Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions
should be considered:
·

Grip the boiler as described in Frame 28.

Be physically capable.

Use PPE as appropriate, e.g. gloves, safety footwear.

During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable
and/or the weight is light.
·

Keep back straight.

Avoid twisting at the waist.

Avoid upper body/top heavy bending.

Always grip with the palm of the hand.

Use designated hand holds.

Keep load as close to the body as possible.

Always use assistance if required.

OPTIONAL EXTRA KITS

Extension duct

up to 1m (39").

CURRENT GAS SAFETY (INSTALLATION AND USE)
REGULATIONS OR RULES IN FORCE.

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 must be carried out by a CORGI
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
·

Gas Safety (Installation and Use) Regulations

The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (northern Ireland).

The Water Fittings Regulations or Water byelaws in
Scotland.

The Current I.E.E. Wiring Regulations.

......continued on page 8.

Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.

In IE, 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.

Detailed recommendations are contained in the following British
Standard Codes of Practice:

BS.6891

Low pressure installation pipes.

BS.6798

Installation of gas fired hot water boilers of rated input
not exceeding 60 kW.

BS.5449

Forced circulation hot water systems.

BS.5546

Installation of gas hot water supplies for domestic
purposes (2nd Family Gases).

BS.7593

Treatment of water in domestic hot water central
heating systems.

BS.5440.1 Flues for gas appliances of rated input not exceeding

70 kW.

BS.5440.2 Ventilation for gas appliances of rated input not

exceeding 70 kW.

Health & Safety Document No. 635
The Electricity at Work Regulations, 1989.
Manufacturer's notes must NOT be taken in any way as overriding
statutory obligations.
IMPORTANT. These appliances are certificated by the BG
Technology Certification Services for safety and performance. It
is, therefore, important that no external control devices, e.g. flue
dampers, economisers etc., are directly connected to these
appliances -unless covered by these Installation and Servicing
instructions or otherwise recommended by Ideal Stelrad Group
in writing. If in doubt please enquire.
Any direct reconnection of a control device not approved by Ideal
Stelrad Group could invalidate the certification and the normal
appliance warranty. It could also infringe the Gas Safety
Regulations and the above regulations.

SAFE HANDLING OF SUBSTANCES

Care should be taken when handling the boiler insulation
panels, which can cause irritation to the skin. No asbestos,
mercury or CFCs are included in any part of the boiler.

LOCATION OF BOILER

The boiler must be installed on a flat and vertical wall, capable
of adequately supporting the weight of the boiler and any
ancillary equipment.

The boiler may be fitted on a combustible wall and insulation
between the wall and the boiler is not necessary - unless
required by the local authority. The boiler must not be fitted
outside.

Timber Framed Buildings
If the boiler is to be fitted in a timber framed building it should be
fitted in accordance with the Institute of Gas Engineering
document IGE/UP/7:1998.

Bathrooms
The boiler may be installed in any room or internal space,
although particular attention is drawn to the requirements of the
current I.E.E. (BS.7671) Wiring Regulations and, in Scotland, the
electrical provisions of the building regulations applicable in
Scotland with respect to the installation of the boiler in a room or

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GENERAL

Classic

Slimline SE FF

Installation & Servicing

This appliance in NOT suitable for use in a direct
hot water system or for gravity circulation.

BOILER WATER CONNECTIONS

The following minimum
clearances must be maintained
for operation and servicing.
Additional space will be
required for installation,
depending upon site
conditions.
Side and Rear Flue
a. Provided that the flue hole is

cut accurately, e.g. with a
core drill, the flue can be
installed from inside the
building.
Installation from inside
ONLY

b. If a core boring tool is to be

used inside the building; the
space in which the boiler is
to be installed must be at
least wide enough to
accommodate the tool.

Pelmet restrictions.

If the ability to fit or remove the
casing during installation and
subsequent servicing is impaired
by pelmets etc. this operation can
be made easier by first removing
the controls pod casing in line
with the following instructions:

a. Release the controls pod

casing fixing screws (a) 3 full
turns only. Remove the pod by
pulling it forward to disengage
from the keyhole slots.

b. Undo the 2 screws (b)

retaining casing to the back
panel.

c. The casing can now be

removed in the direction of the
arrow, first lifting the casing
slightly to disengage the
casing top return from the
back panel. (For this purpose
a minimum clearance of
12mm is required between
the top of the boiler and
pelmet or other similar
obstruction.

Front clearance: 533mm (21")
from the front of the boiler
casing.

Minimum front clearance when
built behind a concealing panel
is 5mm (1/4") provided that the
top and bottom of the casing are
NOT enclosed.

2 BOILER CLEARANCES

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GENERAL

Classic

Slimline SE FF

Installation & Servicing

Table 3 - Balanced flue terminal position

Approved Manufacturer's Clearances

Terminal Position

Minimum Spacing

1a. Directly BELOW an opening, air brick,

opening window, etc.

300 mm (12")

1b. Directly ABOVE an opening, air brick,

opening window, etc.

300 mm (12")

1c. HORIZONTALLY to an opening,

air brick, opening window, etc.

300 mm (12")

2. Below guttering, drain pipes or soil

pipes

25 mm ( 1")

3. Below eaves

25 mm ( 1")

4. Below balconies or a car port roof

25 mm ( 1")

5. From vertical drain pipes or soil pipes

25 mm ( 1")

6. From an internal or external corner or

to a boundary alongside the terminal

25 mm ( 1")

7. Above adjacent ground, roof or

balcony level

300 mm (12")

8. From a surface or a boundary

facing the terminal

600 mm (24")

9. From a terminal facing a terminal

1200 mm (48")

10. From an opening in a car port

(e.g. door or window) into dwelling

1200 mm (48")

11. Vertically from a terminal on the

same wall

1500 mm (60")

12. Horizontally from a terminal on the wall

300 mm (12")

internal space containing a bath or shower. For Ireland
reference should be made to the current ETCI rules for electrical
installations and I.S. 813: 2002.

Where a room-sealed appliance is installed in a room containing
a bath or shower then the appliance and any electrical switch or
appliance control utilising mains electricity should be so situated
that it cannot be touched by a person using the bath or shower.

Where installation will be in an unusual location, special
procedures may be necessary and BS.6798 gives detailed
guidance on this aspect.

Compartment Installations
A compartment used to enclose the boiler MUST be designed
and constructed specially for this purpose.
An existing cupboard or compartment may be used, provided it
is modified for the purpose.

In both cases details of essential features of cupboards/
compartment design, including airing cupboard installation, are
to conform to the following :

BS. 6798.
The position selected for installation MUST allow adequate
space for servicing in front of the boiler and for air circulation
around the boiler. Refer to 'Air Supply'.

For the minimum clearances required for safety and
subsequent service refer to Frame 2. In addition, sufficient
space may be required to allow lifting access to the wall
mounting plate.

GAS SUPPLY

The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an adequate
supply of gas. An existing service pipe must NOT be used without
prior consultation with the local gas supplier.

The boiler is to be installed only on gas supply with a governed
meter.

A gas meter can only be connected by the local gas supplier or by
a local regional contractor.

An existing meter should be checked, preferably by the gas supplier,
to ensure that the meter is adequate to deal with the rate of gas
supply required. A MINIMUM pressure of 20 mbar MUST be
available at the boiler inlet with the boiler operating.

Installation pipes MUST be fitted in accordance with BS. 6891. In
IE refer to I.S. 813:2002. Pipework from the meter to the boiler
MUST be of an adequate size.

The complete installation MUST be tested for gas soundness
and purged as described in the above code.

FLUE INSTALLATION

Pluming may occur at the terminal so terminal positions which
would cause a nuisance should be avoided.

The flue must be installed in accordance with the
recommendations of BS.5440-1:2000. In IE refer to I.S. 813:2002.

The following notes are intended for general guidance:-

1. The boiler MUST be installed so that the terminal is exposed

to external air.

2. It is important that the position of the terminal allows the free

passage of air across it at all times.

3. Minimum acceptable spacing from the terminal to obstructions

and ventilation openings are specified in Table 3.

4. Where the lowest part of the terminal is fitted less than 2m

(6'6") above a balcony, above ground or above a flat roof to
which people have access then the terminal MUST be protected
by a purpose designed guard.
Terminals guards are available from boiler suppliers - ask for
TFC Flue Guard, Model K1. In case of difficulty seek advice
from:

Grasslin (UK) Ltd., Tower House, Vale Rise, Tonbridge,
Kent TN9 1TB.
Tel: +44 (0) 1732 359 888. Fax: +44 (0) 1732 354 445
www.tfc-group.co.uk

Ensure that the guard is fitted centrally.

5. The flue assembly shall be so placed or shielded as to prevent

ignition or damage to any part of any building.

6. The air inlet/products outlet duct and the terminal of the boiler

MUST NOT be closer than 25mm (1") to combustible material.
Detailed recommendations on the protection of combustible
material are given in

BS.5440-1:2000. In IE refer to I.S.

813:2002.

IMPORTANT. It is absolutely ESSENTIAL to ensure, in practice,
that products of combustion discharging from the terminal
cannot re-enter the building or any other adjacent building
through ventilators, windows, doors, other sources of natural air
infiltration, or forced ventilation/air conditioning.

If this should occur, the appliance MUST be turned OFF, labelled
'unsafe' and corrective action taken.

TERMINAL

The terminal assembly can be adapted to accommodate various
wall thicknesses. Refer to Frame 10.

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GENERAL

Classic

Slimline SE FF

Installation & Servicing

Boiler Size

SE FF

Boiler

8.8

11.7

14.6

17.6

Output

Btu/h x 1000

Water Flow

l/min

11.4

15.2

19.0

22.8

Rate

gal/h

150

200

250

300

Pressure

mbar

22.0

20.4

31.5

41.7

Loss

in wg

8.9

8.3

12.6

16.7

Table 4 - High and low vent areas

Boiler

Air from room/internal

Air direct from

space, cm (in

)

outside, cm (in

)

SE9 FF

102

(16)

(8)

SE12 FF

135

(21)

(11)

SE15 FF

170

(26)

(13)

SE18 FF

198

(31)

102

(16)

Table 5 - Water flow rate and pressure loss

AIR SUPPLY

Detailed recommendations for air supply are given in
BS.5440:2. In IE refer to I.S. 813:2002.
The following notes are for general guidance:
1. It is NOT necessary to have a purpose provided air vent in

the room or internal space in which the boiler is installed.

2. If the boiler is to be installed in a cupboard or compartment,

permanent air vents are required (for cooling purposes) in
the cupboard/compartment, at both high and low levels. The
air vents must either communicate with room/internal space,
or be direct to outside air. The minimum effective areas of the
permanent air vents, required in the cupboard/compartment,
are specified in Table 4 and are related to maximum rated
heat input.

3. Both air vents MUST communicate with the same room or

internal space or MUST be on the same wall to outside air.

4. In siting the air vents care must be taken to avoid the freezing

of pipework.

WATER CIRCULATION SYSTEM

The boiler must NOT be used for direct hot water supply. For the
types of system and correct piping procedure refer to 'Introduction'
and Frame 1.
The central heating system should be in accordance with BS.6798
and, in addition, for Smallbore and Microbore systems, BS. 5449.
The domestic hot water system, if applicable, should be in
accordance with the relevant recommendations of BS. 5546. Copper
tubing to BS. 2871:1 is recommended for water carrying pipework.
The hot water storage cylinder MUST be of the indirect type and
should preferably be manufactured of copper.
Single feed, indirect cylinders are not recommended and MUST
NOT be used on sealed systems.
The appliances are NOT suitable for gravity central heating, nor
are they suitable for the provision of gravity domestic hot water.
The hot water cylinder and ancillary pipework, not forming part of
the useful heating surface, should be lagged to prevent heat loss
and any possible freezing - particularly where pipes run through
roof spaces and ventilated under floor spaces.
Boilers not fitted to a sealed system must be vented.

IMPORTANT

A minimum length of 1m of copper pipe MUST be fitted to both
flow and return connections from the boiler before connection to
any plastic piping. This applies to ALL types of installation.
Draining taps MUST be located in accessible positions, which
permit the draining of the whole system - including the boiler and
hot water storage vessel. They should be at least

1/2" BSP

nominal

size and be in accordance with BS. 2879.
The boiler is fitted with a special drain plug, which is provided, to
drain the BOILER ONLY, in the event of the system drain plug being
unable to do so. The hydraulic resistance of the boilers, at MAXIMUM
OUTPUT with an 11

C (20

F) temperature differential, are shown

in Table 5.

Maximum boiler operating temperature should be 82

C (180

F).

WATER TREATMENT

These boilers incorporate a cast iron heat exchanger.
IMPORTANT. The application of any other treatment to this
product may render the guarantee of Ideal Stelrad Group
INVALID.
Ideal Stelrad Group recommend Water Treatment in
accordance with the Benchmark Guidance Notes on Water
Treatment in Central Heating Systems.
Ideal Stelrad Group recommend the use of Fernox, GE Betz
Sentinel or Salamander water treatment products, which must
be used on accordance with the manufacturers instructions.
For further information contact:
Fernox Manufacturing Co. Ltd, Cookson Electronics, Forsyth Road,
Sheerwater, Woking, Surrey. GU21 5RZ. Tel. +44 (0) 1799 521133
or
G E Betz Ltd, Sentinel Division, Foundry Lane, Widnes, Cheshire,
WA8 8UD. Tel. +44 (0) 151 424 5351
or
Salamander Engineering Ltd, Unit 24, Reddicap Trading Estate,
Sutton Coldfield, West Midlands B75 7BU. Tel. +44 (0) 121 378 0952
Notes.
1. It is most important that the correct concentration of the water

treatment products is maintained in accordance with the
manufacturers' instructions.

2. If the boiler is installed in an existing system any unsuitable

additives MUST be removed by thorough cleansing.
BS7593:1992 details the steps necessary to clean a
domestic heating system.

3. In hard water areas, treatment to prevent limescale may be

necessary - however the use of artificially softened water is
NOT permitted.

4. Under no circumstances should the boiler be fired before the

system has been thoroughly flushed.

BOILER CONTROL INTERLOCKS

Ideal Stelrad Group recommend that heating systems utilising
full thermostatic radiator valve control of temperature in individual
rooms should also be fitted with a room thermostat controlling the
temperature in a space served by radiators not fitted with such a
valve as stated in BS. 5449.

Central heating systems controls should be installed to ensure the
boiler is switched off when there is no demand for heating or hot water.

When thermostatic radiator valves are used, the space heating
temperature control over a living / dining area or hallway having a
heating requirement of at least 10% of the boiler heat output should
be achieved using a room thermostat, whilst other rooms are
individually controlled by thermostatic radiator valves. However, if
the system employs thermostatic radiator valves on all radiators,
or two port valves without end switches, then a bypass circuit must
be fitted with an automatic bypass valve to ensure a flow of water
should all valves be in the closed position.

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Classic

Slimline SE FF

Installation & Servicing

GENERAL

Minimum Requirements

Note. The pump manufacturers minimum
requirements must be complied with

System
return

Connections
to boiler

Inverted cold
feed entry

System
flow to
pump

150 (6")
Max

15mm
Cold
feed

450 (18")
Mimimum

22mm
Open vent

Feed / expansion
cistern

Water
level
(cold)

Surge
arrester

75 (3)
Min.

450
(18)
Min.

200
(8)
Min.

Highest
point of
flow or
return

150

(6)

Max

Max. practical

length

To pump

Cold

water

level

Feed / expansion

cistern

75 (3) Min.

Flow

Return

22 (3/4)

Open vent

All dimensions in mm (in.). N.B. Imperial dimensions are approximate

LOW HEAD INSTALLATIONS

The system should be vented directly off the boiler flow pipe, as
close to the boiler as possible. The cold feed entry should be
inverted and MUST be positioned between the pump and the vent,
and not more than 150mm (6") away from the vent connection.

There should be a minimum height - 450mm (18") - of open vent
above cistern water level. If this is impossible refer below.

The vertical distance between the highest point of the system and
the feed/expansion cistern water level MUST not be less than
450mm (18").

The pump MUST be fitted on the flow side of the boiler.

A suitable pump is a domestic circulator capable of providing an
11

C (20

F) temperature differential (e.g. Grundfos UPS 15/50 or

equivalent). The vertical distance between the pump and feed/
expansion cistern MUST comply with the pump manufacturers
minimum requirements to avoid cavitation. Should these
conditions not apply, either lower the pump position or raise the
cistern above the minimum requirement specified by Ideal Stelrad
Group.

Note. A cold water feed must be available back to the boiler, when
all automatic valves are in the closed position (refer to BS. 6798)
and when close coupled the feed must not be in a vertical leg.

The Classic SE range of boilers can be installed in
low head situations by fitting a 'surge arrester' in the
expansion pipe as shown.

The following conditions MUST be observed:

1. The surge arrester must be at least 42mm in

diameter x 150mm long, thus ensuring a
MINIMUM air gap and a MINIMUM depth of water
below the static water level (cold) of 75mm.

2. The static water level (cold) must be at least

200mm above the top of the horizontal flow pipe,
fitted as shown. The vent connection MUST NOT
be made immediately off the top of the boiler, as
venting is made less efficient.

3. The maximum practical length of 15mm cold feed

pipe should be used in order to reduce the
effective volume of system water expanding into
the feed/expansion cistern to a minimum.

OPEN VENT SYSTEM REQUIREMENTS - FULLY PUMPED

ELECTRICAL SUPPLY

This appliance must be efficiently earthed.

Wiring external to the appliance MUST be in accordance with the
current I.E.E. (BS.7671) Wiring Regulations and any local
regulations which apply. For Ireland reference should be made to
the current ETCI rules for electrical installations.

The point of connection to the mains should be readily accessible
and adjacent to the boiler, except that for bathroom installations;
the point of connection to the mains MUST be situated outside of
the bathroom.

Note.

Where a room sealed appliance is installed in a room containing a
bath or shower then the appliance and any electrical switch or
appliance control utilising mains electricity should be so situated
that it cannot be touched by a person using the bath or shower.
See Frame 38 for details.

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Classic

Slimline SE FF

Installation & Servicing

SEALED SYSTEM REQUIREMENTS

GENERAL

Note.

The method of filling, refilling, topping up or flushing sealed
primary hot water circuits from the mains via a temporary hose
connection is only allowed if acceptable to the local water
authority.

1. General

a. The installation must comply with the requirements of

BS.6798 and BS.5449.

b. The installation should be designed to work with flow

temperatures of up to 82

c. All components of the system, including the heat

exchanger of the indirect cylinder, must be suitable for a
working pressure of 3 bar (45 lb/in

) and temperature of

110

C. Care should be taken in making all connections

so that the risk of leakage is minimised.

2. Safety Valve

A spring loaded safety valve complying with the relevant
requirements of BS.6759 must be fitted in the flow pipe, as
close to the boiler as possible and with no intervening valve
or restriction. The valve should have the following features:

a. A non-adjustable pre-set lift pressure not exceeding 3

bar (45 lb./in

)

b. A manual testing device.

c. Provision for connection of a discharge pipe. The valve

or discharge pipe should be positioned so that the
discharge of water or steam cannot create a hazard to
the occupants of the premises or cause damage to
electrical components and wiring.

3. Pressure Gauge

A pressure gauge covering at least the range 0-4 bar (0-60
lb./in

) must be fitted to the system. The gauge should be

easily seen from the filling point and should preferably be
connected at the same point as the expansion vessel.

4. Expansion Vessel

a. A diaphragm type expansion vessel must be connected

at a point close to the inlet side of the pump, the
connecting pipe being not less than 15mm (

1/2

nominal) size and not incorporating valves of any sort.

b. The vessel capacity must be adequate to accept the

expansion of the system water when heated to 110

(230

c. The charge pressure must not be less than the static

water head above the vessel The pressure attained in
the system when heated to 110

C (230

F) should be at

least 0.35 bar (5lb/in

) less than the lift pressure of the

safety valve.

For guidance on vessel sizing refer to Table 6 in Frame 6.
For further details refer to BS.5449. For IE refer to the
current edition of I.S. 813.

5. Cylinder

The cylinder must be either of the indirect coil type or a
direct cylinder fitted with an immersion calorifier which is
suitable for operating on a gauge pressure of 0.35 bar (5lb./
in

) in excess of the safety valve setting. Single feed indirect

cylinders are not suitable for sealed systems.

6. Make-up Water

Provision must be made for replacing water loss from the
system, either:

a. From a manually fitted make-up vessel with a readily

visible water level. The vessel should be mounted at
least 150mm (6") above the highest point of the system
and be connected through a non-return valve to the
system, fitted at least 300mm (12") below the make-up
vessel on the return side of the domestic hot water
cylinder or radiators.

b. Where access to a make-up vessel would be difficult by

pre-pressurisation of the system. Refer to 'Filling.'

Non-return

valve

Automatic

air vent

Hose unions

Additional

stop valve

Hose connector

Hosepipe

(disconnect

after filling)

Double check valve

assembly

(note direction of flow)

Temporary hose

(disconnect

after filling)

ecl6060

200546-5.pmd

20/02/2008, 10:05

GENERAL

Classic

Slimline SE FF

Installation & Servicing

Sizing procedure for expansion vessels: The volume of the expansion vessel (litres) fitted to a sealed system shall not be
less than that given by Table 6, multiplied by a factor of 0.8 (for flow temperatures of less than 88

C).

Safety valve setting

3.0 bar

2.5 bar

2.0 bar

Vessel charge and initial

0.5

1.0

1.5

0.5

1.0

1.5

0.5

1.0

system pressure

bar

Total water content of system

Expansion vessel volume

(litres)

2.1

2.7

3.9

2.3

3.3

5.9

2.8

5.0

4.2

5.4

7.8

4.7

6.7

11.8

5.6

10.0

6.3

8.2

11.7

7.0

10.0

17.7

8.4

15.0

100

8.3

10.9

15.6

9.4

13.4

23.7

11.3

20.0

125

10.4

13.6

19.5

11.7

16.7

29.6

14.1

25.0

150

12.5

16.3

23.4

14.1

20.1

35.5

16.9

30.0

175

14.6

19.1

27.3

16.4

23.4

41.4

19.7

35.0

200

16.7

21.8

31.2

18.8

26.8

47.4

22.6

40.0

225

18.7

24.5

35.1

21.1

30.1

53.3

25.4

45.0

250

20.8

27.2

39.0

23.5

33.5

59.2

28.2

50.0

275

22.9

30.0

42.9

25.8

36.8

65.1

31.0

55.0

300

25.0

32.7

46.8

28.2

40.2

71.1

33.9

60.0

Multiplying factors for

other system volumes

0.0833

0.109

0.156

0.094

0.134

0.237

0.113

0.20

7. Mains Connection

There must be no direct connection to the mains water supply
or to the water storage tank supplying domestic water, even
through a non-return valve, without the approval of the local
water authority.

8. Filling

The system may be filled by one of the following methods:

a. Through a cistern, used for no other purposes, via a ball

valve permanently connected directly to a service pipe and
/ or a cold water distributing pipe.

The static head available from the cistern should be
adequate to provide the desired initial system design
pressure. The cold feed pipe from the cistern should
include a non-return valve and a stop valve with an
automatic air vent connected between them, the stop valve
bein