main HE System 18, HE System 24, HE System 28 User guide

Download

Installation & Service Instructions

System HE

Range

These instructions include the Benchmark Commissioning Checklist

and should be left with the user for safe keeping.

Natural Gas

Main System 18 HE

G.C.No41 467 01

Main System 24 HE

G.C.No41 467 02

Main System 28 HE

G.C.No41 467 03

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.

CORGI operate 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With the introduction of Self Certification Schemes, the Benchmark Logbook is being withdrawn.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.

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.

The code of practice for the installation,

commissioning & servicing of central

heating systems.

“Main” supports

Baxi Heating UK Ltd is a

BS-EN ISO 9001 Accredited Company

© Baxi Heating UK Ltd 2007 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, Pentagon House, Sir Frank Whittle Road, Derby, DE21 4XA.

Full acknowledgement of author and source must be given.

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.

Installer Notification Guidelines

Choose Building

Regulations Notification

Route

Competent Person's

Self Certification Scheme

Install and Commission this appliance to manufacturer's

instructions

Complete the

Benchmark Checklist

If you notify via CORGI Scheme,

CORGI will then notify the

relevant Local Authority

Building Control Scheme

on member's 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 CORGI on: 0870 88 88 777

or log onto:

www.corgi-notify.com

within 10 days

You must ensure that the

notification number issued by

CORGI is written onto the

Benchmark Checklist

CORGI will record the data and

will send a certificate of

compliance to the property

Complete the

Benchmark Checklist

LABC will record the data

and will issue a

certificate of compliance

Legislation

Codes of Practice, most recent version should be used

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 CORGI 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.

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

All CORGI registered installers carry a CORGI identification card and have a registration number. You can check your installer is registered by telephoning 0870 4012300 or writing to:-

1 Elmwood,

Chineham Business Park,

Crockford Lane,

Basingstoke. RG24 8WG

or check online at www.corgi-gas-safety.com

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 CORGI 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.

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 6.1).

In GB the following Codes of Practice apply: Standard Scope

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

domestic purposes. BS 5449 Forced circulation hot water systems. 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 sealed water systems. BS 7593 Treatment of water in domestic hot water

central heating systems.

In IE the following Codes of Practice apply: Standard Scope

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

domestic purposes. BS 5449 Forced circulation hot water systems. BS 7074 Expansion vessels and ancillary equipment

for sealed water systems. BS 7593 Treatment of water in domestic hot water

central heating systems.

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 0051.

Product/Production certified by: Notified Bodies 0051.

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

1.0 Introduction 7

2.0 General Layout 8

3.0 Appliance Operation 9

4.0 Technical Data 10

5.0 Dimensions and Fixings 13

6.0 System Details 14

7.0 Site Requirements 16

8.0 Flue Options 20

9.0 Plume Displacement 25

10.0 Installation 29

11.0 Commissioning 34

12.0 Completion 36

13.0 Servicing 37

14.0 Changing Components 39

15.0 Electrical 48

16.0 Short Parts List 49

17.0 Fault Finding 50

Benchmark Checklist 54

Section Page

1.0 Introduction

1.1 Description

1. The Main System HE range are fully automatic gas fired wall mounted system boilers. They are room sealed and fan assisted.

2. The boilers are set to give a maximum output of

18.9kW, 25.2kW or 29.3kW when in condensing mode.

3. They are designed for use on Natural Gas (G20) and can be converted to use Propane.

4. The boiler incorporates a circulating pump and expansion vessel. It is suitable for use only on fully pumped sealed systems.

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

6. The boiler is intended to be installed in residential / commercial / light industrial E.M.C. environments on a governed meter supply only.

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

8. All systems must be thoroughly flushed and treated with

inhibitor (see section 6.1).

NOTE: There are several detail differences between

each model. Generally these do not affect the installation or maintenance of the boiler, unless otherwise stated.

1.2 Contents of Pack

The pack contains:-

Boiler Wall Plate (including taps) Set of Pipe Connections Template Literature Pack

Data Badge

Fig. 1

Control Box

Case Front Panel

2.0 General Layout

2.1 Layout

1. Air Pressure Switch

2. Expansion Vessel

3. Burner Manifold

4. Automatic Air Vent

5. Circulation Pump

6. Drain Off Point

7. Pressure Relief Valve

8. System Pressure Gauge

9. PCB

10. Control Box

11. Condensate Trap

12. Flame Sensing Electrode

13. Spark Electrode

14. Burner

15. Primary Heat Exchanger

16. Fan Assembly

17. Secondary Heat Exchanger

18. On/Off/Reset Selector Switch

19. Temperature Control

20. Flame Failure or Blocked Condensate Drain

21. Safety Thermostat Activated (Boiler or Flue)

22. Fault on Fan or Flue

23. Fault on Pump or Low System Pressure

24. Fault on Temperature Sensor

25. Fault on Temperature Sensor

26. Power On

27. Boiler On

28. Burner On

When neons 20 to 25 are constantly illuminated, they indicate the temperature of the central heating water.

bar

30° 40° 50° 60° 70° 80°

Reset

30° 40° 50° 60° 70° 80°

20 21

27 28

3.0 Appliance Operation

3.1 Operating Mode (Fig. 2)

1. With a demand for heating, the pump circulates water through the primary circuit. At a pre-determined flow rate the hydraulic differential pressure switch operates, initiating the ignition sequence.

2. The main burner ignites at low rate, then the gas valve 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).

IMPORTANT: When the selector switch is in the ‘0’ (Off) position the electrical supply to the boiler is isolated. The boiler will not operate.

3.2 Frost Protection Mode

1. The frost protection mode is integral to the appliance and functions when the selector switch (see Section 2.1) is in the ON 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.

3.3 Pump Protection

1. With the selector switch (see Section 2.1) in the ON position ( ) the pump will automatically operate for 1 minute in every 24 hours to prevent sticking.

10 12 11

Key

1 Heat Exchanger 2 Burner 3 Ignition Electrode 4 Flame Sensing Electrode 5 Gas Valve 6 Pump 7 Automatic Air Vent 8 Pressure Relief Valve 9 Boiler Drain Point 10 Gas Inlet 11 Boiler Flow 12 Boiler Return 13 Pressure Gauge 14 Automatic By-Pass 15 Hydraulic Differential Pressure Sensor 16 Safety Thermostat 17 Temperature Sensor 18 Expansion Vessel 19 Temperature Sensor 20 Secondary Heat Exchanger

Boiler Primary Circuit

Fig. 2

4.0 Technical Data

4.1 System 18 HE

Flue Terminal Diameter 100mm Dimensions Projection 125mm

Outercase Dimensions

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

Clearances

Above Casing 200 mm Min Below Casing 200 mm Min Front 450 mm Min (For Servicing) Front 5 mm Min (In Operation) L.H. Side 5mm Min R.H. Side 5mm Min (In Operation)

20mm Min (See Note*)

*NOTE: The boiler can be operated with a clearance of 5mm at the right. This is also sufficient for routine maintenance. However a clearance of 20mm is required if it is necessary to remove the secondary heat exchanger. This should be considered when siting the appliance and in the event of any subsequent alterations in the area of installation

Weights kg

Packaged Boiler Carton 49 Installation Lift Weight 38.5

Central Heating Primary Circuit Pressures

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

Pump

Available Head See graph below

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

bar

Min Pre-charge Pressure 0.5

litre Max Capacity of CH System 125

Primary Water Content of Boiler (unpressurised) 1.2

Connections copper tails Gas Supply - 22mm Central Heating Flow - 22mm Central Heating Return - 22mm Pressure Relief Discharge - 15mm

Temperatures

Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

Heat Input

Max Min

kW 18.7 10.6

Electrical Supply 230V~ 50H

(Appliance must be connected to an

earthed supply)

Power Consumption 140W

External Fuse Rating 3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

Appliance Category CAT II

2H 3P

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

m3/h 1.98

Inlet Pressure (Natural Gas - G20)

mbar 20

Burner Injector (Natural Gas - G20)

12 x 1.18mm Diameter

Burner Pressure (Natural Gas - G20)

Max Rate Min Rate

mbar 8.6 ± 0.5 3 ± 0.5

Appliance Type C

NOxClass 3

Electrical Protection

IPX5D

Heat Output (Non-Condensing)

Max Min

kW 18 9.9

Heat Output (Condensing)

Max Min

kW 18.9 10.2

Condensate Drain 1” BSP

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

Metre (wg)

Flow Rate (l/h)

Pump - Available Head

4.5

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 have been certified by 0051.

SEDBUK Declaration For System 18 HE

The seasonal efficiency (SEDBUK) is 87.4% (87.3% LPG)

Band B

LPG Propane - G31

Burner Injector 0.77mm diameter

Burner Pressure

Propane mbar

Inlet Pressure

mbar

Max Rate

20 ± 0.5

Min Rate

6.6 ± 0.2

4.0 Technical Data

4.2 System 24 HE

Flue Terminal Diameter 100mm Dimensions Projection 125mm

Outercase Dimensions

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

Clearances

Above Casing 200 mm Min Below Casing 200 mm Min Front 450 mm Min (For Servicing) Front 5 mm Min (In Operation) L.H. Side 5mm Min R.H. Side 5mm Min (In Operation)

20mm Min (See Note*)

Weights kg

Packaged Boiler Carton 51 Installation Lift Weight 40.5

Central Heating Primary Circuit Pressures

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

Pump

Available Head See graph below

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

bar

Min Pre-charge Pressure 0.5

litre Max Capacity of CH System 125

Primary Water Content of Boiler (unpressurised) 1.2

Connections copper tails Gas Supply - 22mm Central Heating Flow - 22mm Central Heating Return - 22mm Pressure Relief Discharge - 15mm

Temperatures

Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

Heat Input

Max Min

kW 24.8 10.6

Electrical Supply 230V~ 50H

(Appliance must be connected to an

earthed supply)

Power Consumption 170W

External Fuse Rating 3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

Appliance Category CAT II

2H 3P

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

/h 2.62

Inlet Pressure (Natural Gas - G20)

mbar 20

Burner Injector (Natural Gas - G20)

15 x 1.18mm Diameter

Burner Pressure (Natural Gas - G20)

Max Rate Min Rate

mbar 10.2 ± 0.5 2 ± 0.5

Appliance Type C

NOxClass 3

Electrical Protection

IPX5D

Heat Output (Non-Condensing)

Max Min

kW 24 9.8

Heat Output (Condensing)

Max Min

kW 25.2 10.1

Condensate Drain 1” BSP

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

4.5

5.5

Metre wg

l/h

Pump - Available Head

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 have been certified by 0051.

SEDBUK Declaration For System 24 HE

The seasonal efficiency (SEDBUK) is 87.4% (87.2% LPG)

Band B

LPG Propane - G31

Burner Injector 0.77mm diameter

Burner Pressure

Propane mbar

Inlet Pressure

mbar

Max Rate

21.8 ± 0.5

Min Rate

4.4 ± 0.2

4.0 Technical Data

4.3 System 28 HE

Flue Terminal Diameter 100mm Dimensions Projection 125mm

Outercase Dimensions

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

Clearances

Above Casing 200 mm Min Below Casing 200 mm Min Front 450 mm Min (For Servicing) Front 5 mm Min (In Operation) L.H. Side 5mm Min R.H. Side 5mm Min (In Operation)

20mm Min (See Note*)

Weights kg

Packaged Boiler Carton 51 Installation Lift Weight 40.5

Central Heating Primary Circuit Pressures

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

Pump

Available Head See graph below

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

bar

Min Pre-charge Pressure 0.5

litre Max Capacity of CH System 125

Primary Water Content of Boiler (unpressurised) 1.2

Connections copper tails Gas Supply - 22mm Central Heating Flow - 22mm Central Heating Return - 22mm Pressure Relief Discharge - 15mm

Temperatures

Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

Heat Input

Max Min

kW 28.9 11.9

Electrical Supply 230V~ 50H

(Appliance must be connected to an

earthed supply)

Power Consumption 180W

External Fuse Rating 3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

Appliance Category CAT II

2H 3P

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

m3/h 3.06

Inlet Pressure (Natural Gas - G20)

mbar 20

Burner Injector (Natural Gas - G20)

15 x 1.25mm Diameter

Burner Pressure (Natural Gas - G20)

Max Rate Min Rate

mbar 10.9 ± 0.5 2.1 ± 0.5

Appliance Type C

NOxClass 3

Electrical Protection

IPX5D

Heat Output (Non-Condensing)

Max Min

kW 28 11

Heat Output (Condensing)

Max Min

kW 29.3 11.3

Condensate Drain 1” BSP

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

4.5

5.5

Metre wg

l/h

Pump - Available Head

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 have been certified by 0051.

SEDBUK Declaration For System 28 HE

The seasonal efficiency (SEDBUK) is 87.3% (87.2% LPG)

Band B

LPG Propane - G31

Burner Injector 0.77mm diameter

Burner Pressure

Propane mbar

Inlet Pressure

mbar

Max Rate

29.4 ± 0.5

Min Rate

5.2 ± 0.2

5.0 Dimensions and Fixings

Dimensions

A 780mm

B 345mm

C 450mm

D 107mm Ø Min.

E 185mm

F 190mm

G 131mm

Heating

Return

(22mm)

Heating

Flow

(22mm)

Pressure Relief

Valve

(15mm)

Gas

Inlet

(22mm)

130 mm

65 mm

Tap Rail

360° Orientation

Tube Ø 100mm

At Least 1.5°

28mm Condensate Drain

6.0 System Details

6.1 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 Betz-Dearborn Sentinel X300 or X400 or Fernox Superfloc Universal Cleanser. 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. Betz-Dearborn Sentinel X100 and Fernox-Copal which should be used following the inhibitor manufacturer’s instructions.

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.

6.2 Bypass

1. The boiler is fitted with an automatic integral bypass.

6.3 System Control

1. For optimum operating conditions, the heating system into which the boiler is installed should include a control system.

2. Such a system will comprise of a timer control and separate room or cylinder thermostats as appropriate.

3. The boiler should be controlled so that it operates on demand only.

4. Operation of the system under control of the boiler thermostat & TRV’s only does not produce the best results.

6.0 System Detail

6.4 System Filling and Pressurising

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

3. 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”.

4. 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.

6.5 Expansion Vessel

1. The appliance expansion vessel is pre-charged to 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”.

6.6 Pressure Relief Valve (Fig. 4)

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.

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.

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.

Fig. 3

Fig. 4

Stop Valve

Double Check Valve

Mains Cold Water

CH Return

Temporary Hose

Pressure Relief Valve

Discharge Pipe

Stop Valve

7.0 Site Requirement

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/Reset Selector Switch in the On Position.

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).

7.2 Clearances (Figs. 5 & 6)

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.

200mm Min

780mm

450mm

200mm Min

20mm/5mm Min

see *NOTE:

5mm Min

450mm Min

For Servicing

Purposes

Fig. 5

Fig. 6

In Operation

7.0 Site Requirement

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. 7).

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.

2. The mains supply must be 230V ~ 50Hzand fused at 3A maximum.

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.

3. When the system includes an indirect domestic hot water cylinder it is recommended that a cylinder thermostat is used in conjunction with a 3 port 2 position valve or 2 port zone valve.

7.6 Bath & Shower Rooms

1. If the boiler is fitted in a room containing a bath or shower, it can be fitted in zone 2, (Figs. A & B shows zone dimensions for a bathtub. For other examples refer to Section 601 of 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. 7

Gas Service Cock

Zone 2

Zone 1

Zone 0

Zone 2

Zone 3

Zone 2

Window Recess

0.6 m

2.4 m

Ceiling

Outside Zones

Zone 3

Zone 2

Zone 1

Zone 0

2.25 m

Zone 2

Window Recess

3.0 m

2.4 m

0.6 m

Fig. A

Fig. B

In GB Only

+ 39 hidden pages

main HE System 18, HE System 24, HE System 28 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual