main Eco Elite 25 Combi ErP User guide

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Main Eco Elite Combi

Installation & Service Manual

United Kingdom

Condensing Central Heating Boiler

25 - 30

These instructions include the Benchmark Commissioning Checklist

and should be left with the user for safw keeping.

Natural Gas

Main Eco Elite 25 Combi ErP

47 467 12

G.C.N

Main Eco Elite 30 Combi ErP

G.C.No47 467 13

Building Regulations and the Benchmark Commissioning

Checklist

Building Regulations (England & Wales) require notification of the installation of a heating appliance to the relevant Local Authority Building Control Department. From 1 April 2005 this can be achieved via a Competent Persons Self Certification Scheme as an option to notifying the Local Authority directly. Similar arrangements will follow for Scotland and will apply in Northern Ireland from 1 January 2006.

The Health & Safety Executive operates the ‘Gas Safe Register’, a self-certification scheme for gas heating appliances.

These arrangements represent a change from the situation whereby compliance with Building Regulations was accepted as being demonstrated by completion of the Benchmark Logbook (which was then left on site with the customer).

With the introduction of Self Certification Schemes, the Benchmark Logbook is being withdrawn. However, a similar document in the form of a commissioning checklist and service interval record is incorporated at the back of these instructions.

The Benchmark Scheme

Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by competent persons and that it meets the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future reference.

Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme. Visit www.centralheating.co.uk for more information.

© Baxi Heating UK Ltd 2015 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, or stored in any retrieval system of any nature (including in any database), in each case whether electronic, mechanical, recording or otherwise, without the prior written permission of the copyright owner, except for permitted fair dealing under Copyrights, Designs and Patents Act 1988.

Applications for the copyright owner’s permission to reproduce or make other use of any part of this publication should be made, giving details of the proposed use, to the following address:

The Company Secretary, Baxi Heating UK Ltd, Brooks House, Coventry Road, Warwick. CV34 4LL

Full acknowledgement of author and source must be given.

This company is a member of the Benchmark initiative and fully supports the aims of the programme. Its aim is to improve the standards of installation and commissioning of central heating systems in the UK and to encourage the regular servicing of all central heating systems to ensure safety and efficiency.

Building Regulations require that installations should comply with manufacturer's instructions. It is therefore important that the commissioning checklist is completed by the installer. The relevant section of Building Regulations only relates to dwellings. Therefore the checklist only applies if the appliance is being installed in a dwelling or some related structure.

The flowchart opposite gives guidance for installers on the process necessary to ensure compliance with Building Regulations.

WARNING: Any person who does any unauthorised act in relation to a copyright work may be liable to criminal prosecution and civil claims for damages.

0086

ISO 9001

FM 00866

Choose Building

Regulations Notification

Route

Installer Notification Guidelines

Competent Person's

Self Certification Scheme

Install and Commission this appliance to manufacturer's

instructions

Complete the

Benchmark Checklist

If you notify via the ‘Gas Safe

the Building Regulations

certificate on members’ behalf

Building Control

Contact your relevant Local

Authority Building Control

(LABC) who will arrange

an inspection or contact a government approved

inspector

Install and Commission this appliance to manufacturer's

instructions

Scheme Members only

Call ‘Gas Safe Register’ on:

0800 408 5577

or log onto:

www.gassaferegister.co.uk

within 10 days

You must ensure that the

certificate number issued by

the ‘Gas Safe Register’ is written

onto the Benchmark Checklist

‘Gas Safe Register’ will issue a

Building Regulations Compliance

Certificate to the property owner

and inform the relevant LABC

Complete the

Benchmark Checklist

LABC will record the data

and will issue a

certificate of compliance

IMPORTANT - Installation, Commissioning, Service & Repair

This appliance must be installed in accordance with the manufacturer’s instructions and the regulations in force. Read the instructions fully before installing or using the appliance.

In GB, this must be carried out by a competent person as stated in the Gas Safety (Installation & Use) Regulations.

Definition of competence: A person who works for a Gas Safe registered company and holding current certificates in the relevant ACS modules, is deemed competent.

In IE, this must be carried out by a competent person as stated in I.S. 813 “Domestic Gas Installations”.

The addition of anything that may interfere with the normal operation of the appliance without express written permission from the manufacturer or his agent could invalidate the appliance warranty. In GB this could also infringe the Gas Safety (Installation and Use) Regulations.

Legislation

This company declare that no substances harmful to health are contained in the appliance or used during appliance manufacture.

The appliance is suitable only for installation in GB and IE and should be installed in accordance with the rules in force, and only used in a suitably ventilated location.

In GB, the installation must be carried out by a Gas Safe Registered Installer. It must be carried out in accordance with the relevant requirements of the:

• Gas Safety (Installation & 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.

Warning - Check the information on the data plate is compatible with local supply conditions.

All Gas Safe registered engineers carry an ID card with their licence number and a photograph. You can check your engineer is registered by telephoning 0800 408 5500 or online at www.gassaferegister.co.uk

The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)

Regulations 1993 N

3083” and is deemed to meet the requirements of Directive 92/42/EEC on the energy efficiency requirements for new hot water boilers fired with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by: Notified Body 0086.

Product/Production certified by: Notified Body 0086.

For GB/IE only.

Homologations

CE Marking

EC - Declaration of Conformity

Baxi Heating UK Limited being the manufacturer / distributor within the European Economic Area of the following

Main Eco Eliite 25 Combi ErP Main Eco Elite 30 Combi ErP

declare that the above is in conformity with the provisions of the Council Directive

2009/142/EC 92/42/EEC 2004/108/EC 2006/95/EC 2009/125/EC 2010/30/EU

and has been subject to the following conformity procedures laid down in

Annex 2 - Article 3 of 2009/142/EC

under the supervision of the British Standards Institution, a Notified Body authorized by the United Kingdom Competent Authority, and carrying the Notified Body Number 0086.

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.

All systems must be thoroughly flushed and treated with inhibitor (see section 6.2).

Codes of Practice - refer to the most recent version

In GB the following Codes of Practice apply: Standard Scope

BS 6891 Gas Installation. BS 5546 Installation of hot water supplies for domestic

BS EN 12828 Heating systems in buildings. BS EN 14336 Installation & commissioning of water based

BS 6798 Installation of gas fired hot water boilers. BS 5440 Part 1 Flues. BS 5440 Part 2 Ventilation. BS 7074 Expansion vessels and ancillary equipment for

BS 7593 Treatment of water in domestic hot water

In IE the following Codes of Practice apply: Standard Scope

I.S. 813 Domestic Gas Installations. The following standards give valuable additional information; BS 5546 Installation of hot water supplies for domestic

BS EN 12828 Heating systems in buildings. BS EN 14336 Installation & commissioning of water based

BS 7074 Expansion vessels and ancillary equipment for

BS 7593 Treatment of water in domestic hot water

purposes.

heating systems.

sealed water systems.

central heating systems.

purposes.

heating systems.

sealed water systems.

central heating systems.

Type test for purpose of Regulation 5 certified by: Notified Body 0086.

Product/Production certified by: Notified Body 0086.

For GB/IE only.

Safe Manual Handling

General

The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance.

Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly shoulders, arms and hands. Health & Safety is the responsibility of EVERYONE.

There is no ‘safe’ limit for one man - each person has different capabilities. The boiler should be handled and lifted by TWO PEOPLE.

Do not handle or lift unless you feel physically able.

Wear appropriate Personal Protection Equipment e.g. protective gloves, safety footwear etc.

Preparation

Co-ordinate movements - know where, and when, you are both going.

Minimise the number of times needed to move the boiler - plan ahead.

Always ensure when handling or lifting the route is clear and unobstructed. If possible avoid steps, wet or slippery surfaces, unlit areas etc. and take special care on ladders/into lofts.

Technique

When handling or lifting always use safe techniques - keep your back straight, bend your knees. Don’t twist - move your feet, avoid bending forwards and sideways and keep the load as close to your body as possible.

Where possible transport the boiler using a sack truck or other suitable trolley.

Always grip the boiler firmly, and before lifting feel where the weight is concentrated to establish the centre of gravity, repositioning yourself as necessary. See the ‘Installation’ section of these instructions for recommended lift points.

Remember

The circumstances of each installation are different. Always asses the risks associated with handling and lifting according to the individual conditions.

If at any time when installing the boiler you feel that you may have injured yourself STOP !! DO NOT ‘work through’ the pain - you may cause further injury.

IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER - OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !!

CONTENTS

Section Page

1.0 Introduction 7

2.0 General Layout 8

3.0 Appliance Operation 9

4.0 Technical Data 10

5.0 Dimensions and Fixings 12

6.0 System Details 13

7.0 Site Requirements 16

8.0 Flue Options 21

9.0 Installation 23

10.0 Commissioning 28

11.0 Completion 31

12.0 Servicing 32

13.0 Changing Components 34

14.0 Setting the Gas Valve 43

15.0 Electrical 44

16.0 Short Parts List 45

17.0 Fault Finding 46

18.0 Notes 52

Benchmark Checklist 54

Case Front Panel

1.0 Introduction

1.1 Description

1. The Main Eco Elite Combi is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and mains fed domestic hot water.

2. The boiler is set to give a maximum output of :-

25 model - 25.94 kW DHW

26.95 kW CH Pnc (Condensing)

30 model - 28.63 kW DHW

30.2 kW CH Pnc (Condensing)

3. It is designed for use on Natural Gas (G20).

4. The boiler is suitable for use only on fully pumped sealed heating systems. Priority is given to domestic hot water.

5. The boiler data badge gives details of the model, serial number and Gas Council numbe. It is visible when the case front panel is removed (Fig. 1).

Control Box

Fig. 1

Facia Door

Data Badge

6. The boiler model name and serial number are also shown on the information label on the back of the facia door. This is for user reference.

7. The boiler is intended to be installed in residential / domestic environments on a governed meter supply only.

8. The boiler must be installed with one of the purpose designed flues such as the standard horizontal flue kit, part no. 5118489 .

9. All systems must be thoroughly flushed and treated with

inhibitor (see section 6.2).

Information Label

1.2 Contents of Pack

1. Boiler Unit

2. Wall Plate (inc. taps)

3. Set of Pipes (inc. nuts)

4. Template

5. Literature Pack

7. Filling Loop

8. 24 hr. Electro - Mechanical Timer

2.0 General Layout

2.1 Layout

1. Expansion Vessel

2. Automatic Air Vent

3. DHW Plate Heat Exchanger

4. Circulation Pump

5. Drain Off Point

6. Pressure Relief Valve

7. Selector Switch

8. Central Heating System Pressure Gauge

9. PCB

10. Control Box

11. 3-Way Valve Assembly

12. Condensate Trap

13. Heat Exchanger Air Vent

14. Electrode Assembly

15. Primary Heat Exchanger

16. Fan Assembly

17. On/Off/Reset Selector Switch

18. Central Heating Temperature Control

19. Hot Water Temperature Control

20. Water Pressure Sensor

21. Gas/Air Inlet

22. Burner Mounting Panel

23. Igniter

24. Burner On Light

25. Central Heating Mode Light

26. Domestic Hot Water Mode Light

27. Display

28. Position for Integral Timer

Reset

bar

3.0 Appliance Operation

Central Heating Circuit

Fig. 2

Key

1 Primary Heat Exchanger 2 Burner 3 Ignition Electrodes 4 Flame Sensing Electrode 5 Gas Valve 6Pump 7 Automatic Air Vent 8 Plate Heat Exchanger/Automatic By-Pass 9 Flow Sensor with Filter & Regulator 10 Pressure Relief Valve 11 Boiler Drain Point 12 Heating Return 13 Cold Water Inlet On/Off Valve and Filter 14 Gas Inlet

Domestic Hot Water Circuit

5 6

1213141516

15 Domestic Hot Water Outlet 16 Heating Flow 17 Pressure Gauge 18 Water Pressure Sensor 20 Fan 21 Diverter Valve Assembly 22 Diverter Valve Motor 23 Domestic Hot Water Flow Temperature Sensor 24 Safety Thermostat 25 Central Heating Temperature Sensor 26 Expansion Vessel 27 Heat Exchanger Air Vent

3.1 Central Heating Mode (Fig. 2)

1. With a demand for heating, the pump circulates water through the primary circuit.

2. Once main burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the temperature sensor.

3. When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling). The pump continues to run during this period.

4. When the demand is satisfied the burner is extinguished and the pump continues to run for a period of 3 minutes (Pump Overrun).

3.2 Domestic Hot Water Mode (Fig. 3)

1. Priority is given to the domestic hot water supply. A demand at a tap or shower will override any central heating requirement.

2. The flow of water will operate the Hall Effect Sensor which requests the 3 way valve to change position. This will allow the pump to circulate the primary water through the DHW plate heat exchanger.

3. The burner will light automatically and the temperature of the domestic hot water is controlled by the temperature sensor.

4. When the domestic hot water demand ceases the burner will extinguish and the diverter valve will remain in the domestic hot water mode, unless there is a demand for central heating.

IMPORTANT: When the selector switch is in the ‘0’ (Off) position the electrical supply to the boiler is isolated. The boiler will not operate and the integral timer will require resetting once the selector switch is set to either Position ( ) or Position ( ).

3.3 Frost Protection Mode

Fig. 3

5 6

1. The frost protection mode is integral to the appliance and functions only with the selector switch (see Section 2.1) in the domestic hot water and central heating position. If the system temperature falls below 5° C then the boiler will fire on its minimum setting until a flow temperature of 30° C is reached. Further protection can be incorporated by using a system frost thermostat.

3.4 Pump Protection

1. With the selector switch (see Section 2.1) in either the

1213141516

central heating or central heating and domestic hot water position, the pump will automatically operate for 1 minute in every 24 hours to prevent sticking.

4.0 Technical Data

4.1 Main Eco Elite 25 & 30 Combi ErP

Appliance Type C

Appliance Category CAT I

Heat Input CH Qn Hs (Gross)

Max Min

25 model kW 28.92 8.68

30 model kW 32.54 9.77

Heat Output CH Pn (Non-Condensing)

Max Min

25 model kW 25.94 7.61

30 model kW 28.63 8.56

Heat Output CH Pnc (Condensing)

Max Min

25 model kW 26.95 8.37

30 model kW 30.2 9.42

Heat Input DHW Qnw Hs (Gross)

Max

25 model kW 28.92

30 model kW 33.30

Heat Output DHW Max

25 model kW 24.88

30 model kW 30.00

Max Gas Rate (Natural Gas - G20)

(After 10 mins)

25 model m3/h 2.76

30 model m3/h 3.17

Product Characteristic Database

(SEDBUK)

SAP 2009 Annual Efficiency

25 - 89.0 % 30 - 88.7 %

This 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 has been certified by 0086.

NOTE: All data in this section are nominal values and subject to normal production tolerances.

Inlet Pressure (Natural Gas - G20)

mbar 20

Injector (Natural Gas - G20)

6.0mm

Electrical Supply 230V~ 50H

(Appliance must be connected to an

earthed supply)

Power Consumption

25 & 30 105W

Electrical Protection

IPX0D (with timer) IPX4D (without timer)

External Fuse Rating 3A

Internal Fuse Rating F2L

Condensate Drain

To accept 21.5mm (3/4in) plastic waste pipe

Flue Terminal Diameter 100mm Dimensions Projection 125mm

Connections copper tails

Gas Supply - 22mm Central Heating Flow - 22mm Central Heating Return - 22mm Cold Water Mains Inlet - 15mm DHW Flow - 15mm Pressure Relief Discharge - 15mm

Outercase Dimensions

Casing Height - 780mm Overall Height Inc Flue Elbow - 965mm Casing Width - 450mm Casing Depth - 345mm

Clearances Above Casing 175 mm Min

300mm Min (80/125) Below Casing 200 mm Min Front 450 mm Min (For Servicing) Front 5 mm Min (In Operation) L.H. Side 5 mm Min R.H. Side 5 mm Min (In Operation)

Weights 25 & 30

Packaged Boiler Carton 51.0 kg Installation Lift Weight 45.0 kg

NOxClass 5

Central Heating Primary Circuit Pressures

bar Safety Discharge 3 Max Operating 2.5 Min Operating 0.5 Recommended Operating Range 1-2

DHW Circuit bar Pressures

Max Operating 8 Min Operating 0.15

Flow Rates (25) (30)

l/min l/min DHW Flow Rate @ 30o C Rise 11.9 14.3

DHW Flow Rate @ 35o C Rise 10.2 12.3

Min Working DHW Flow Rate 2 2

IMPORTANT: Where Low Flow Taps or Fittings are intended to be used in the DHW system connected it is strongly recommended that the DHW flow rate DOES NOT fall below 2.5l/min. This will ensure reliable operation of the DHW function.

Pump

Available Head See graph below

Expansion Vessel - (For Central Heating only. Integral with appliance)

bar

Min Pre-charge Pressure 0.5

Max Capacity of litre CH System 125

For greater system capacities an

additional expansion vessel MUST be fitted.

Primary Water Content of Boiler (unpressurised) 3.1

Temperatures

C.H. Flow Temp (adjustable)

25°C to 80°C max (± 5°C)

D.H.W. Flow Temp (adjustable)

35°C to 60°C max (± 5°C) dependent upon flow rate

Pump - Available Head

5.5

4.5

3.5

2.5

Metre (wg)

1.5

0.5

200 400 600 800 1000 1200 1400

Flow Rate (l/h)

4.0 Technical Data

See

4.2 Technical Parameters

Technical parameters for boiler combination heaters

Main Eco Elite Combi ErP

Condensing boiler

Low-temperature boiler

(1)

B1 boiler

Cogeneration space heater

Combination heater

Rated heat output

Useful heat output at rated heat output and high temperature regime

(2)

Useful heat output at 30% of rated heat output and low temperature regime

(1)

Seasonal space heating energy efficiency

Useful efficiency at rated heat output and high temperature regime

(2)

Useful efficiency at 30% of rated heat output and low temperature regime

(1)

Auxiliary electricity consumption

Full load

Part load

Standby mode

Other items

Standby heat loss

Ignition burner power consumption

Annual energy consumption

Sound power level, indoors

Emissions of nitrogen oxides NO

Prated

elmax

elmin

stby

ign

kWh GJ

mg/kWh

Yes Yes

No No

Yes Yes

26 29

25.9 28.6

8.4 9.5

92 92

89.7 88.0

97.0 97.0

0.049 0.098

0.016 0.016

0.003 0.003

0.061 0.061

22557 24896

81 90

50 50

25 30

Domestic hot water parameters

Declared load profile

Daily electricity consumption

Annual electricity consumption

Water heating energy efficiency

Daily fuel consumption

Annual fuel consumption

(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other

heaters 50°C return temperature (at heater inlet).

(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature

at heater outlet.

elec

AEC

fuel

AFC

kWh

XL XL

0.200 0.191

44 42

81 88

24.251 21.845

18 17

S The back cover for contact details.

Domestic Hot

Water Outlet

(15mm)

Cold Water

Inlet

(15mm)

Heating

Return

(22mm)

Heating

Flow

(22mm)

Pressure Relief

Valve

(15mm)

Gas

Inlet

(22mm)

65 mm

65 mm 65 mm

65 mm

127 mm

Condensate

Drain

At Least 1.5

5.0 Dimensions and Fixings

Dimensions

A 780mm

360° Orientation

B 345mm

C 450mm

D 116mm Ø Min.

F 145mm

G 106mm

210mm (80/125)

H 225mm

Tube Ø 100mm

Tap Rail

6.0 System Details

6.1 Information

1. The Main Eco Elite Combi Condensing Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN).

a) IRN 001 - See text of entry for installation

requirements and notes.

b) IRN 302 - Byelaw 14.

2. Reference to the WRc publications, ‘Water fittings and materials directory’ and ‘Water supply byelaws guide’ give full details of byelaws and the IRNs.

6.2 Central Heating Circuit

1. The appliance is suitable for fully pumped SEALED SYSTEMS ONLY.

Treatment of Water Circulating Systems

• All recirculatory water systems will be subject to corrosion unless an appropriate water treatment is applied. This means that the efficiency of the system will deteriorate as corrosion sludge accumulates within the system, risking damage to pump and valves, boiler noise and circulation problems.

• When fitting new systems flux will be evident within the system, which can lead to damage of system components.

• All systems must be thoroughly drained and flushed out using, for example, Sentinel X300 or X400 or Fernox F3. They should be used following the flushing agent manufacturer’s instructions.

• System additives - corrosion inhibitors and flushing agents/descalers should comply to BS7593 requirements, e.g. Sentinel X100 and Fernox MB-1 which should be used following the inhibitor manufacturer’s instructions.

• Full instructions are supplied with the products, for further information contact Sentinel (0800 389 4670) or Fernox (0870 870 0362)

Failure to flush and add inhibitor to the system will invalidate the appliance warranty.

• It is important to check the inhibitor concentration after installation, system modification and at every service in accordance with the manufacturer’s instructions. (Test kits are available from inhibitor stockists.)

• For information or advice regarding any of the above contact Technical Enquiries.

6.3 Bypass

1. The boiler utilises the primary side of the DHW plate heat exchanger as an automatic integral bypass.

6.4 System Control

1. Further external controls (e.g. room thermostat) should be fitted to optimise the economical operation of the boiler.

6.0 System Details

6.5 System Filling and Pressurising (Fig. 4)

Fig. 4

Stop Valve

DHW Mains Inlet

Double Check Valve

Temporary Hose

Stop Valve

CH Return

1. A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling.

2. A filling loop is supplied with the boiler in the installation kit. Follow the instructions provided with it to connect to the taps shown in Fig.5.

3. The filling method adopted must be in accordance with all relevant water supply regulations and use approved equipment.

4. Your attention is drawn to: for GB: Guidance G24.2 and recommendation R24.2 of the Water Regulations Guide. for IE: the current edition of I.S. 813 “Domestic Gas Installations”.

5. The sealed primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe, provided a ‘Listed’ double check valve or some other no less effective backflow prevention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use.

Filling Loop Connections

Fig. 5

6.6 Expansion Vessel (Central Heating only)

1. The appliance expansion vessel is pre-charged to 0.5 bar. Therefore, the minimum cold fill pressure is 0.5 bar. The vessel is suitable for correct operation for system capacities up to 125 litres. For greater system capacities an additional expansion vessel MUST be fitted. For GB refer to BS 7074 Pt 1. For IE, the current edition of I.S. 813 “Domestic Gas Installations”.

6.7 Safety Pressure Relief Valve (Fig. 6)

1. The pressure relief valve is set at 3 bar, therefore all pipework, fittings, etc. should be suitable for pressures in excess of 3 bar and temperature in excess of 100°C.

2. The pressure relief discharge pipe should be not less than 15mm dia, run continuously downward, and discharge outside the building, preferably over a drain. It should be routed in such a manner that no hazard occurs to occupants or causes damage to wiring or electrical components. The end of the pipe should terminate facing down and towards the wall.

Pressure Relief Valve

Fig. 6

Discharge Pipe

3. The discharge must not be above a window, entrance or other public access. Consideration must be given to the possibility that boiling water/steam could discharge from the pipe.

Other Tap Outlets

Expansion Vessel*

Boiler

6.0 System Details

6.8 Domestic Hot Water Circuit (Fig. 7)

1. All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations.

2. Your attention is drawn to: for GB: Guidance G17 to G24 and recommendation R17 to R24 of the Water Regulations Guide. for IE: the current edition of I.S. 813 “Domestic Gas Installations”.

Fig. 7

Check Valve*

Pressure Reducer Valve*

Stop Tap

To Hot Taps

* See 6.8 for instances when these items may be required

3. The Water Regulations recommendations for England and Wales prohibits backflow from appliances into the wholesome water supply due to thermal expansion. However this type of instantaneous combination boiler, with less than 15 litres of stored capacity, does not require any backflow prevention device as any thermal expansion is accommodated within the appliance. It is possible in certain circumstances that other cold water demands (e.g. washing machines, flushing of W.C.s) may affect the DHW function of the boiler. In these instances the fitting of a backflow prevention device and expansion vessel is recommended.

4. Also if there is an existing check valve, loose jumpered stop cock, water meter or water treatment device already fitted to the wholesome water supply connected to the boiler domestic hot water (DHW) inlet supply then a suitable expansion device may be required.

5. If the hot water expansion is not provided for, then high pressures can develop which may result in damage to fittings and devices on the system.

6. The boiler’s maximum working mains pressure is 8 bar, therefore all pipework, connections, fittings, etc. should be suitable for pressures in excess of 8 bar. A pressure reducing valve must be fitted for pressures in excess of 8 bar. The manufacturer of any outlet fittings, such as a shower valve, may require a lower maximum pressure. The pressure reduction must take account of all fittings connected to the DHW system.

6.9 Showers

1. If a shower control is supplied from the appliance it should be of the thermostatic or pressure balanced type. Thermostatic type shower valves provide the best comfort and guard against water at too high a temperature. Existing controls may not be suitable - refer to the shower valve manufacturer.

6.10 Hard Water Areas

1. Only water that has NOT been artificially softened must used when filling or re-pressurising the primary system. If the mains cold water to the property is fitted with an artificial softening/treatment device the source use to fill or re-pressurise the system must be upstream of such a device.

7.0 Site Requirements

Fig. 8

5mm Min

450mm

5mm Min

175mm Min

(300mm Min if

using 80/125mm

flueing system)

780mm

200mm Min

7.1 Location

1. The boiler may be fitted to any suitable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permitting satisfactory removal of combustion products and providing an adequate air supply. The boiler should be fitted within the building unless otherwise protected by a suitable enclosure i.e. garage or outhouse. (The boiler may be fitted inside a cupboard-see Section 7.3).

2. If the boiler is sited in an unheated enclosure then it is recommended to leave the ON/OFF Selector Switch in the domestic hot water and central heating position to give frost protection.

3. If the boiler is fitted in a room containing a bath or shower reference must be made to the relevant requirements. In GB this is the current I.E.E. Wiring Regulations and Building Regulations. In IE reference should be made to the current edition of I.S. 813 “Domestic Gas Installations” and the current ETCI rules.

4. If the boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engineers Publication IGE/UP/7 (Gas Installations in Timber Framed Housing).

450mm Min

For Servicing

Purposes

At Least 1.5°

7.2 Clearances (Figs. 8 & 9)

1. A flat vertical area is required for the installation of the boiler.

2. These dimensions include the necessary clearances around the boiler for case removal, spanner access and air movement. Additional clearances may be required for the passage of pipes around local obstructions such as joists running parallel to the front face of the boiler.

Fig. 9

5mm Min

In Operation

7.0 Site Requirement

Gas Service Cock

Fig. 10

Zone 1

Zone 0

Zone 2

Window Recess

Zone 2

7.3 Ventilation of Compartments

1. Where the appliance is installed in a cupboard or compartment, no air vents are required.

2. BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation.

7.4 Gas Supply

1. The gas installation should be in accordance with the relevant standards. In GB this is BS 6891. In IE this is the current edition of I.S. 813 “Domestic Gas Installations”.

2. The connection to the appliance is a 22mm copper tail located at the rear of the gas service cock (Fig. 10).

3. Ensure that the pipework from the meter to the appliance is of adequate size. Do not use pipes of a

smaller diameter than the boiler gas connection (22mm).

7.5 Electrical Supply

1. External wiring must be correctly earthed, polarised and in accordance with relevant regulations/rules. In GB this is the current I.E.E. Wiring Regulations. In IE reference should be made to the current edition of ETCI rules.

Fig. 11

Zone 1

Zone 0

Window Recess

Zone 2

0.6 m

In GB Only

Window Recess Zone 2

Zone 2

0.6 m

2.25 m

Ceiling

Outside Zones

2. The mains supply is 230V ~ 50Hzfused at 3A.

NOTE: The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance.

Connection may be via a fused double-pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only.

7.6 Bath & Shower Rooms

1. If the boiler is fitted in a room containing a bath or shower and NOT FITTED with any integral timer or thermostat, it can be fitted in zone 2, (Figs. 11 & 12 shows zone dimensions for a bathtub. For other examples refer to the Current I.E.E. Wiring Regulations) reference must be made to the relevant requirements. In GB this is the current I.E.E. Wiring Regulations and Building Regulations. In IE reference should be made to the current edition of I.S. 813 “Domestic Gas Installations” and the current ETCI rules.

Fig. 12

In GB Only

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