200545-5.pmd

Classic SE Propane FF -

Installation & Servicing

GENERAL

Table 1 - General Data

To obtain the gas consumption:

a. For l/s divide heat input (kW) by C.V. of the

gas (MJ/m

)

b. For ft

/h divide heat input (Btu/h) by C.V. of

the gas (Btu/ft

)

Boiler Size

SE15P FF

SE18P FF

SE24P FF

Gas supply connection

Rc 1/2 (1/2)

Flow connection

22mm

28mm copper

copper

(FEMALE)

Return connection

22mm

28mm copper

copper

(FEMALE)

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.)

3.65 (0.8)

4.65 (1.0)

Dry Weight

kg (lb)

42 (93)

48 (106)

Maximum installation weight

kg (lb)

34 (75)

40 (88)

Boiler size

Height

mm (in.)

700 (27.5)

Width

mm (in.)

380 (15.0)

Depth

mm (in.)

300 (11.8)

Flue duct diameter

mm (in.)

100 (4.0)

Boiler Size

SE15P FF

SE18P FF

SE24P FF

Boiler input

18.3

21.9

29.3

(Btu/h)

(62 500)

(74 700)

(100 000)

Gas consumption l/s (ft

/h)

0.20 (25.0)

0.23 (29.2)

0.30 (38.1)

Boiler output

14.7

17.6

23.5

(Btu/h)

(50 000)

(60 000)

(80 000)

Burner Setting

mbar

35.9

35.8

34.8

pressure (HOT)

(in.w.g.)

(14.4)

(14.0)

Inlet pressure

mbar (in.w.g.)

37.0 (14.8)

Seasonal efficiency (SEDBUK)*

Band D

[82.0]%

[80.4]%

Table 2 - Performance Data

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

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.

Key to symbols
IE

= Ireland

= United Kingdom

PMS = Maximum operating pressure of water
C

& C

= A room sealed appliance designed for connection via ducts

to a horizontal or vertical 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 up stream of the combustion chamber.

A room sealed appliance designed for connection via concentric

vertical ducts and a draught diverter located in the roof space to

a secondary flue. The combustion air is taken from the roof

space. The fan is down stream of the combustion chamber.

= An appliance designed for use on 3rd Family gas, Group P only.

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Classic SE Propane FF -

Installation & Servicing

GENERAL

Boiler size

G.C. Appliance No.

PI No.

(Benchmark No.)

White

Silver

SE15P FF

41-395-37

41-397-72

87 AP 107

SE18P FF

41-395-38

41-397-73

87 AP 107

SE24P FF

41-395-39

41-397-74

87 AP 107

classic SE FF P

Destination Countries:

GB, IE

Propane Gas only

Appliance Type

Boler Size

All Models

SE18P FF, SE24P FF

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 ............................................ 23
External Controls ........................................................ 24
Fault Finding ................................................................ 37
Flue Installation ............................................................. 8

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

Gas Safety ..................................................................... 6
Gas Supply .................................................................... 8
Health & Safety Document ........................................... 6
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

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

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

NOTE TO THE INSTALLER: COMPLETE

THE BENCHMARK COMMISSIONING

CHECKLIST AND LEAVE THESE

INSTRUCTIONS WITH APPLIANCE

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Classic SE Propane FF -

Installation & Servicing

GENERAL

INTRODUCTION

The Classic SE15P FF, SE18P FF, SE24P 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 base 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. Refer to Frame 18.

Split the boiler down to reduce the weight, e.g. remove

casing and hardware pack. Refer to Frame 9.

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

Downward Piping Kit
Programmer Kit.
Vertex Flue Kit. For vertical flue connection on SE18P FF and

SE24P FF only (to a maximum primary flue length of 4m and a

maximum secondary flue length of 6m (SE18P FF) and 7m

(SE24P FF)).
Roof Flue Kit For vertical flue connection (to a max. of 3m).
90

Flue Elbow Turret Kit

Sealed System Unit.

Fits on top of the appliance.

Extension ducts.

Up to 3 m (118").

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.

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.5482

Domestic butane and propane burning
appliances

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 and 3rd Family Gases).

BS.5440.1

Flues for gas appliances of rated input not
exceeding 60 kW.

BS.5440.2

Ventilation for gas appliances of rated input not
exceeding 60 kW.

BS.7593

Treatment of water in domestic hot water central
heating systems.

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 British
Standards Institution 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 BSI 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 this 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 IG/UP/7:1998.

continued on page 8

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Classic SE Propane FF -

Installation & Servicing

GENERAL

BOILER WATER CONNECTIONS

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

SE24P FF boiler ONLY
must be fitted with the 22mm x 28mm copper sockets,
provided in the Hardware Pack (or equivalent 22mm x
28mm compression fittings), and the pumped flow and
return pipes run in 28mm pipe.

2 BOILER CLEARANCES

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.

c. If using the Complete Sealed

System Unit then refer to the
instructions packed with the unit for
the necessary clearances.

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 in to cupboard is 75 mm
(3").

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Classic SE Propane FF -

Installation & Servicing

GENERAL

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")

Bathrooms
This range of appliances is rated IP 1XB.
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 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.
If the appliance is to be installed in a room containing a bath or
shower then, providing waterjets are not going to be used for
cleaning purposes (such as communal baths/showers), the
appliance can be installed in Zone 3, as detailed in BS.7671.
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 should 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, see section on 'Air Supply'.
For the minimum clearances required for safety and
subsequent service, see the wall mounting diagram, Frame
2. In addition, sufficient space may be required to allow lifting
access to the wall mounting plate.

GAS SUPPLY

A local propane supplier should be consulted, at the installation
planning stage, in order to establish the availability of an adequate
supply of gas.
Installation pipes, cylinders and pressure regulators MUST be
fitted in accordance with BS. 5482.1. In IE refer to I.S. 813:2002.
Pipework from the supply to the boiler MUST be of an adequate
size.
Bulk tank installations must comply with the Home Office code of
practice for the storage of liquefied petroleum gas at fixed
installations.
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. The minimum spacing in Table 3,
Nos. 2,3, 4, 5 and 6 would be 75mm in order to allow a terminal
guard to be fitted.

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.

7. Where it is essential that the terminal wall plate is fitted, i.e.

wall thicknesses over 600mm (23

1/2

") or with an inaccurately

cut hole, the minimum spacing in Table 3 Nos. 2,3, 4, 5 and 6
would be 60mm (2

1/2

") in order to allow the terminal wall plate

to be fitted.

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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Classic SE Propane FF -

Installation & Servicing

GENERAL

Table 5 - Water flow rate and pressure loss

Boiler Size

SE15P FF

SE18P FF

SE24P FF

Boiler

14.7

17.6

23.5

Output

Btu/h

50 000

60 000

80 000

Water Flow

l/min

19.0

22.8

30.3

Rate

gal/h

250

300

400

Pressure

mbar

31.5

41.7

77.0

Loss

in w.g.

12.6

16.7

30.9

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.
Refer to Table 4 for details of air vent position and sizing.

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.
The boiler must be vented (not on sealed system).

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 resistances 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.

Table 4 - High and low vent areas

Boiler

Air from room/internal

Air direct

space cm

(in

)

outside cm

(in

)

SE15P FF

170 (26)

83 (13)

SE18P FF

198 (31)

102 (16)

SE24P FF

264 (41)

132 (21)

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Classic SE Propane FF -

Installation & Servicing

GENERAL

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 BS.
6798) and when close coupled the feed must not be in a
vertical leg.

Minimum Requirements

OPEN VENT SYSTEM REQUIREMENTS - FULLY PUMPED

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

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.

Note. The pump manufacturers minimum
requirements must be complied with.

All dimensions in mm (in.). NB. Imperial dimensions are approximate.

LOW HEAD INSTALLATIONS

ELECTRICAL SUPPLY

WARNING. The 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.

200545-5.pmd

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Classic SE Propane FF -

Installation & Servicing

GENERAL

SEALED SYSTEM REQUIREMENTS

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
(0-60lb./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 the table 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

200545-5.pmd

21/02/2008, 10:21

Classic SE Propane FF -

Installation & Servicing

GENERAL

SEALED SYSTEM REQUIREMENTS - cont.

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 the table on the following page, 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: