201279-6.pmd

excel HE -

Installation and Servicing

GENERAL

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

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

)

Key to symbols
GB =

United Kingdom

IE = Ireland

(Countries of destination)

PMS = Maximum operating pressure of water
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.

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

Table 1 - General Data

excel HE C24

excel HE C28

excel HE C32

Max

Min

Max

Min

Max

Min

Burner pressure (hot)

G20

mbar

13.4

5.0

10.5

3.9

12.9

3.8

(in.w.g.)

(5.3)

(2.0)

(4.2)

(1.6)

(5.2)

(1.5)

Input based on nett CV

24.4

15.2

29.0

18.4

33.4

19.0

(btu/h)

(83,300)

(51,900)

(98,900)

(62,800)

(114,000)

(64,800)

Input based on gross CV

27.1

16.9

32.2

20.4

37.1

21.1

(btu/h)

(92,400)

(57,600)

(109,900)

(69,600)

(126,600)

(72,000)

Output: Non condensing

23.4

14.2

28.0

17.6

32.0

17.9

C Mean Water temp.

(btu/h)

(80,000)

(48,500)

(95,500)

(60,000)

(109,000)

(61,000)

Condensing

25.1

15.3

29.8

18.3

34.3

18.9

C Mean Water temp.

(btu/h)

(85,600)

(52,200)

(101,700)

(62,400)

(117,000)

(65,000)

Gas consumption (Hot)

G20

l/s

0.700

0.40

0.83

0.53

0.96

0.54

(ft

/h)

89.0

50.4

105.9

122

69.4

Seasonal efficiency *

(SEDBUK)

Band B [ 86.4 ]%

Band B [ 86.3 ]%

*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.

Table 2 - Performance Data - Central Heating

HE C24 Max HE C24 Min

HE C28 Max HE C28 Min HE C32 Max HE C32 Min

Max. Burner pressure (hot) G20 mbar (in.w.g.)

13.4 (5.3)

2.2 (0.9)

10.5 (4.2)

1.5 (0.6)

12.9 (5.2)

1.6 (0.6)

Input based on nett CV

kW (btu/h)

24.4 (83,300)

29.0 (98,900)

33.4 (114,000)

Input based on gross CV

kW (btu/h)

27.1 (92,400)

32.2 (109,900)

37.1 (126,600)

Output

kW (btu/h)

23.4 (80,000)

28.0 (95,500)

32.0 (109,000)

Gas consumption (Hot)

G20

l/s (ft

/h)

0.7 (89)

0.83 (105.9)

0.96 (122)

Flow 35

C temp. rise

l/m (gpm)

9.6 (2.1)

11.5 (2.6)

13.1 (2.9)

Flow 40

C temp. rise

l/m (gpm)

8.4 (1.8)

10 (2.2)

11.5 (2.6)

Domestic hot water specific rate l/m (gpm)

11.2 (2.5)

13.4 (3.0)

15.3 (3.4)

Table 3 - Performance Data - Domestic Hot Water

excel HE C24

excel HE C28 excel HE C32

Gas supply

- G20 - 20mbar

Gas Supply Connection

Injector Size

1.1

1.25

Inlet Connection

Domestic Hot Water

15mm copper compression

Outlet Connection

Domestic Hot Water

15mm copper compression

Flow Connection

Central Heating

22mm copper compression

Return Connection

Central Heating

22mm copper compression

Flue Terminal Diameter

mm (in)

100 (4)

Average Flue Temp-Mass Flow Rate

C - 14g/s

C - 16g/s

C - 18g/s

Maximum Working Pressure (Sealed Systems)

bar (lb/in

)

2.5 (36.3)

Maximum Domestic Hot Water Inlet Pressure

bar (lb/in

)

10.0 (145)

Minimum Domestic Hot Water Inlet Pressure

bar (lb/in

)

0.5 (7)

Electrical Supply

230 V ~ 50 Hz.

Power Consumption

168

180

184

Fuse Rating

External : 3A Internal :

Water content

Central Heating

litre (gal)

1.9 (0.42) 2.0 (0.44)

Domestic Hot Water

0.2 (0.044)

Packaged Weight

kg (lb)

47 (103)

53 (117)

Maximum Installation Weight

kg (lb)

43 (95)

49 (108)

Boiler Casing Size

Height

mm (in)

800 (31

Width

mm (in)

450 (17

Depth

mm (in)

320 (12

NOX Classification

Class 2

IP Rating

IP20

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excel HE -

Installation and Servicing

GENERAL

CONTENTS

Air Supply ..................................................................... 10
Benchmark Commissioning Checklist ..................... 58
Boiler Clearances ......................................................... 9
Boiler Exploded Diagram ....................................... 12,13
Condensate Drain ....................................................... 23
Electrical Connections ............................................... 26
Electrical Supply ......................................................... 10
Extension Ducts - Fitting ............................................. 18
Fault Finding ........................................................... 49-53
Flow Wiring Diagram .................................................. 29
Flue Fitting .............................................................. 15-18
Horizontal Flue Installation ........................................... 8
Roof Flue Kit Installation ....................................... 19-21
Gas Safety Regulations ................................................ 7
Gas Supply ..................................................................... 8
Installation ............................................................. 14-31
Mandatory Requirements ........................................ 7-11
Pump .......................................................................... 46
Safe Handling ................................................................ 6
Servicing ................................................................ 32-48
Short List of Parts ....................................................... 54
Thermostatic Radiator valves ................................... 10
Water and Systems .............................................. 10-12
Water Connections ..................................................... 24
Water Treatment ......................................................... 12
Wiring Diagrams ................................................... 26-29

excel HE

Natural Gas only

Destination Country: GB, IE

ex7380

oiler

Page

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

Controls

Time and temperature control to heating ............. 27
Time and temperature control to hot water .......... 27
Heating zone valves .............................................. n/a
TRV's ...................................................................... 10
Auto bypass ............................................................ 11
Boiler interlock ....................................................... 10

For all boilers

Flushing to BS.7593 .............................................. 12
Inhibitor .................................................................. 12

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 .......................................................... 11

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 .................................................. 23

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

Boiler size

G.C. Appliance No.

PI No.

(Benchmark No.)

C24

47 348 35

87 BP 46

C28

47 348 36

87 BP 46

C32

47 348 37

87 BP 46

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excel HE -

Installation and Servicing

GENERAL

BOILER WATER CIRCUIT DIAGRAM

INTRODUCTION

The excel HE range of boilers are wall mounted, full sequence,
automatic spark ignition, low water content, fanned flue, high
efficiency, condensing, combination gas boilers.
Note.Due to the high efficiency of the boiler a plume of water

vapour will form at the terminal during operation.

Central heating (CH) and instantaneous domestic hot water
(DHW) outputs are fully modulating with a maximum of :
C24

23.4kW (80,000 Btu/h)

C28

28.0kW (95,500 Btu/h)

C32

32.0kW (109,000 Btu/h)

The boilers are supplied fully assembled with DHW plate heat
exchanger, diverter valve, circulating pump, pressure gauge,
safety valve and CH expansion vessel.
Variable CH and DHW temperature controls are fitted on the
user control.
The boiler casing is of white painted mild steel with a plastic
drop down controls access door.
The boiler temperature controls are located behind the controls
access door.
The main heat exchanger is made of copper, the high efficiency
recuperator is made of stainless steel and the DHW plate heat
exchanger is made of stainless steel.
The boiler is suitable for connection to fully pumped, sealed
water systems ONLY. Adequate arrangements for completely
draining the system by provision of drain cocks MUST be
provided in the installation pipework.
A system bypass is not required when TRV's are fitted to ALL
radiators (see Frame 5). The boiler incorporates an automatic
bypass.
Pipework from the boiler is routed downwards as standard, but
may be routed upwards behind the boiler using the stand-off
frame (supplied in a separate kit).

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.

OPERATION

With no demand for CH, the boiler fires only when DHW is
drawn off.
When there is a demand for CH, the heating system is
supplied at the selected temperature of between 38

C and

C, until DHW is drawn off. The full output from the boiler is

then directed via the diverter valve to the plate heat exchanger to
supply a nominal DHW draw-off of :
C24

9.6 l/min (2.1 GPM) at 35

C rise.

C28

11.5 l/min (2.6 GPM) at 35

C rise.

C32

13.1 l/min (2.9 GPM) at 35

C rise.

Note. Quoted flow rates and temperature rises are those
theoretically achievable. Flow rates measured during
commissioning may differ (due, for example, to resistance of
domestic hot water pipe lengths and fittings or available
dynamic gas pressures).
Due to system variations and seasonal temperature
fluctuations DHW flow rates/temperature rise will vary, requiring
adjustment at the draw off tap.
At low DHW draw-off rate the maximum temperature is limited
to 65

C by the modulating gas control.

Refer also to Frame 1 - 'Boiler Water Circuit Diagram'.

LEGEND
1. DHW plate heat exchanger
2. DHW flow switch
3. DHW outlet pipe
4. Domestic cold water inlet cock
5. 3 - way diverter valve
6. Main circuit drainage cock
7. CH flow cock
8. By-pass valve
9. CH return cock
10. 3 Bar pressure relief valve
11. Gas cock
12. Expansion vessel
13. Gas valve inlet pressure tap
14. Modulating gas valve
15. Burner pressure tap
16. Flame detection electrode
17. Ignition electrodes
18. Burner
19. Combustion chamber
20. Primary heat exchanger
21. Fan

ix7410

22. Air pressure switch
23. Venturi device
24. Flue outlet pipe
25. Air intake pipe
26. Automatic air vent
27. Overheat thermostat
28. Pump
29. Pump vent plug
30. CH thermistor
31. CH flow switch
32. DHW thermistor
33. CH temperature pressure gauge
34. Recuperator
35. Sensor dry fire/condensate blockage thermistor
36. Condensate pipe
37. Collector flue condensate

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excel HE -

Installation and Servicing

GENERAL

OPTIONAL EXTRA KITS

FLUING:

Flue Extension Ducts. ('D' Pack - 1000mm long).
C24-up to 3m
C28-up to 2.675m
C32-up to 1.725m
90

Elbow Kit (60/100 dia maximum no. per installation).

C24-up to 2 elbows
C28-up to 2 elbows
C32-up to 1 elbow
45

Elbow Kit (60/100 dia maximum no. per installation).

C24-up to 2 elbows
C28-up to 2 elbows
C32-up to 1 elbow
Roof Flue Kit (80/125)
C24-up to a maximum length of 16 m
C28-up to a maximum length of 12 m
C32- up to a maximum length of 8 m
Roof Flue Extension Duct Kit (80/125)
Pitched Roof Tile (for roof flue kit)
Flat Roof Tile (For roof flue kit)
Ridge Tile Flue Terminal (For twin flue kit)
Adaptor (60/100 to 80/125)
Twin Flue Kit (80/80)
Twin Flue Kit (60/60)
Vertical Connector (60/100)
Vertical Outlet Flue Kit with Elbow (60/100)
C24-up to a maximum length of 5.5 m
C28-up to a maximum length of 4 m
C32- up to a maximum length of 2.5 m
80mm Extension Duct
60mm Extension Duct
90

Elbow (80mm male/female)

Elbow (60mm male/female)

Elbow (80mm male/female)

Elbow (60mm male/female)

Flue Finishing Kit
90

Elbow (80/125)

Slip Coupling (80mm)
Slip Coupling (60mm)
High Level Flue Outlet Kit

OTHER OPTION KITS:

Mechanical Programmer (24 hour)
Electronic Programmer (7 day)
Condensate Pump Kit
Siphon Kit
Stand Off Kit
Pre-Piping Frame Kit

SAFETY

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, or in IE a competent person. 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 bye-laws 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. 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).

BS. 5449

Forced circulation hot water systems.

BS. 5546

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

BS. 6798

Installation of gas fired hot water boilers of rated
input not exceeding 70 kW.

BS. 6891

Low pressure installation pipes.

Health & Safety Document No. 635.
The Electricity at Work Regulations, 1989.
The manufacturer's notes must NOT be taken, in any way, as
overriding statutory obligations.
IMPORTANT. These appliances are CE certificated 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 as otherwise
recommended by Ideal Stelrad Group in writing. If in doubt
please enquire.
Any direct connection 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 or its
manufacture.

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.
For electrical safety reasons there must be no access available
from the back of the boiler.
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.
Bathroom Installations
This appliance is rated IP20.

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excel HE -

Installation and Servicing

GENERAL

The boiler may be installed in any room or internal space,
although particular attention is drawn to the requirements of the
current IEE (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 IE 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 water jets are not going to be used for
cleaning purposes (as in communal baths/showers), the
appliance can be installed in Zone 3, as detailed in BS.7671.

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
that it is modified for the purpose.
In both cases, details of essential features of cupboard /
compartment design, including airing cupboard installation,
are to conform to the following:

BS 6798 (No cupboard ventilation is required - see `Air
Supply' for details).
The position selected for installation MUST allow adequate
space for servicing in front of the boiler.
For the minimum clearances required for safety and
subsequent service, see the wall mounting template and
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 MUST be installed on a gas supply with a governed
meter only.
A gas meter can only be connected by the local gas supplier or
by a CORGI registered engineer. In IE by a competent person.
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.

IMPORTANT.

Installation pipes must be fitted in accordance with BS.6891. In
IE refer to IS.813:2002. Pipework from the meter to the boiler
MUST be of an adequate size, i.e. not less than 22mm O.D.
copper or

" B.S.P. iron.

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

FLUE INSTALLATION

Pluming will occur at the terminal so terminal positions where
this could 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 4.

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.
Terminal guards are available from boiler suppliers. (Ask for
TFC flue guard model no. K6 - round, plastic coated). In case
of difficulty contact:
Grasslin (UK) Ltd.

Tel. + 44 (0) 01732 359 888

Tower House, Vale Rise

Fax. + 44 (0) 01732 354 445

Tonbridge. Kent TN9 1TB

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.

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 as 'unsafe' until corrective action can be taken.

TERMINAL

The terminal assembly can be adapted to accommodate
various wall thicknesses. Refer to Frame 11.

Terminal Position

Minimum Spacing

1. Directly below, above or alongside of

another openable window, air vent,
or other ventilation opening.

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

150 mm

(6")

6. From an internal or external corner or

to a boundary along side the terminal.

100 mm

(4")

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")

Vertical Terminals

13. Above the roof pitch with roof slope

300 mm (12")

of all angles to air inlet.
Above flat roof to air inlet.

300 mm (12")

14. From single wall face

600 mm (24")

From corner walls

1000 mm (40")

Twin Flue Applications

15. Centre distance between air inlet

120mm (5")

and flue outlet ducts

Table 4

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excel HE -

Installation and Servicing

GENERAL

450 (17

331 (13")

119 (4

800

(31

320 (12

177 (7")

Flue
terminal

Gas Inlet

CH Return

Condensate
Drain

DHW Inlet

DHW Outlet

Pressure Relief Outlet

CH Flow

ix7378

10 (

470 (18

10 (

35
(1

109

200 (8") **

100 (4")*

from case

water & gas
connections

condensate

drain

BOILER DIMENSIONS, SERVICES & CLEARANCES

all dimensions in mm (in)

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
where wall thicknesses do not exceed 600mm (24").

Front clearance
The minimum front clearance when built in to a
cupboard is 5mm (1/4") from the cupboard door but
450mm (17 3/4") overall clearance is still required,
with the cupboard door open, to allow for servicing.

Bottom clearance
Bottom clearance after installation can be reduced to 5mm.
However, 100mm must be available for servicing.

Where the space into which the boiler is going to be
installed is less than the length of flue required the flue
must be fitted from the outside.

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.

SIDE FLUE ONLY **

Horizontal length of flue

Top clearance

from boiler to

required (MIN.)

outside wall

Dim. A

C24

C28

C32

0.5 m

200 mm (7

7/8

1.0 m

200 mm (7

7/8"

)

1.5 m

230 mm (9")

2.0 m

2.0 m 1.725 m 250 mm (9

13/16

2.5 m

N/A

260 mm (10 1

3.0 m 2.675 m N/A

280 mm (11")

REAR FLUE ONLY **

MIN. Top clearance required = 200 mm (8")

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excel HE -

Installation and Servicing

GENERAL

General

1. The installation must comply with all relevant national and

local regulations.

2. The installation should be designed to work with flow

temperatures of up to 82

3. All components of the system must be suitable for a

working pressure of 3 bar and temperature of 110

C. Extra

care should be taken in making all connections so that the
risk of leakage is minimised.

The following components are incorporated within the
appliance:

a. Circulating pump.

b. Safety valve, with a non-adjustable preset lift pressure

of 3 bar.

c. Pressure gauge, covering a range of 0 to 4 bar.

d. A 7-litre expansion vessel, with an initial charge

pressure of 0.75 bar.

Notes

a. 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.

b. Antifreeze fluid, corrosion and scale inhibitor fluids suitable

for use with boilers having copper heat exchangers may be
used in the central heating system.

Advice should be sought from a local water treatment
company.

AIR SUPPLY

It is NOT necessary to have a purpose-provided air vent in
the room or internal space in which the boiler is installed.
Neither is it necessary to ventilate a cupboard or
compartment in which the boiler is installed, due to the low
surface temperatures of the boiler casing during operation;
therefore the requirements of BS 6798, Clause 12, and BS
5440:2 may be disregarded.

WATER CIRCULATION SYSTEM

IMPORTANT.

A minimum length of 1 metre of copper pipe MUST be fitted
to both flow and return connections from the boiler before
connection to any plastic piping.

The central heating system should be in accordance with
BS.6798 and, in addition, for smallbore and microbore
systems, BS.5449.

WATER TREATMENT - see Frame 6

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.

ELECTRICAL SUPPLY

WARNING.
This appliance must be 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 IE 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.

CONDENSATE DRAIN

Refer to Frame 27

A condensate drain is provided on the boiler. This drain must
be connected to a drainage point on site. All pipework and
fittings in the condensate drainage system MUST be made of
plastic - no other materials may be used.

IMPORTANT.

Any external runs must be insulated.
The drain outlet on the boiler is standard 21.5mm (3/4")
overflow pipe.

SYSTEM REQUIREMENTS - Central Heating

Safety valve setting

bar

3.0

Vessel charge pressure

bar

0.5 to 0.75

System pre-charge pressure bar

None

1.0

System volume

Expansion vessel

(litres)

volume (litres)

1.6

1.8

3.1

3.7

4.7

5.5

100

6.3

7.4

125

7.8

9.2

150

9.4

11.0

175

10.9

12.9

190

11.9

14.0

200

12.5

14.7

250

15.6

18.4

300

18.8

22.1

For other system volumes
multiply by the factor across

0.063

0.074

4. 'Make-up' Water. Provision must be made for replacing

water loss from the system, either :

a. From a manually filled 'make-up' vessel with a readily

visible water level. The vessel should be mounted at
least 150mm above the highest point of the system and
be connected through a non-return valve to the system,
fitted at least 150mm below the 'make-up' vessel on the
return side of the radiators.
or

continued . . . . . .

201279-6.pmd