Baxi Solo 12 HE, Solo 18 HE, Solo 15 HE, Solo 24 HE, Solo 30 HE Installation And Servicing Instructions

Baxi HE Range

Wall Mounted Powered Flue Condensing Boilers

Gas Fired Central Heating Units

These instructions include the Benchmark Commissioning Checklist and

should be left with the User for safe keeping

Installation & Servicing Instructions

Natural Gas

Baxi Solo 12 HE

G.C.No41 075 50

Baxi Solo 15 HE

G.C.No41 075 46

Baxi Solo 18 HE

G.C.No41 075 51

Baxi Solo 24 HE

G.C.No41 075 45

Baxi Solo 30 HE

G.C.No41 075 44

This product has an energy rating (A) on a scale of A to G.

For more information see www.boilers.org.uk. This is a certification mark.

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With the introduction of Self Certification Schemes, the Benchmark Logbook is being withdrawn.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

© Baxi Heating UK Ltd 2006 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.

Baxi Heating UK Ltd is a

BS-EN ISO 9001 Accredited Company

The code of practice for the installation,

commissioning & servicing of central

heating systems.

“Baxi” supports

Installer Notification Guidelines

Choose Building

Regulations Notification

Route

Contact your relevant Local

Authority Building Control

(LABC) who will arrange

an inspection or contact a government approved

inspector

LABC will record the data

and will issue a

certificate of compliance

CORGI will record the data and

will send a certificate of

compliance to the property

You must ensure that the

notification number issued by

CORGI is written onto the

Benchmark Checklist

Scheme Members only

Call CORGI on: 0870 88 88 777

or log onto:

www.corgi-notify.com

within 10 days

If you notify via CORGI Scheme,

CORGI will then notify the

relevant Local Authority

Building Control Scheme

on member's behalf

Complete the

Benchmark Checklist

Install and Commission this appliance to manufacturer's

instructions

Competent Person's

Self Certification Scheme

Building Control

Complete the

Benchmark Checklist

Install and Commission this appliance to manufacturer's

instructions

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 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 6.2).

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”.

NOTE: 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

Codes of Practice, most recent version should be used

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 0087.

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 section 8.3 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 !!

1.0 Introduction 7

2.0 General Layout 8

3.0 Appliance Operation 9

4.0 Technical Data 10

5.0 Dimensions and Fixings 11

6.0 System Details 12

7.0 Site Requirements 16

8.0 Flue Options 20

9.0 Plume Displacement 25

10.0 Installation 29

11.0 Electrical 35

12.0 Commissioning the Boiler 37

13.0 Fitting the Outer Case 38

14.0 Servicing the Boiler 39

15.0 Changing Components 41

16.0 Short Parts List 48

17.0 Fault Finding 49

Benchmark Checklist 58

Section Page

Contents

Contents of Pack

The pack contains:-

• Boiler

• Wall Plate

• Template & ‘Quick Fit’ Guide

• Literature Pack

• Fittings Pack

1.1 Description

1. The Baxi Solo HE range are gas fired room sealed fan assisted condensing central heating boilers.

2. The maximum output of the Baxi Solo 12 HE is 40,330 Btu/hr, 15 HE is 52,000 Btu/hr, 18 HE is 60,770 Btu/hr, 24 HE is 75,000 Btu/hr. The maximum output of the 30 HE is preset at 75,000 Btu/hr but can be set to 100,000 Btu/hr (see section 10.8). All boilers automatically adjust their outputs according to the system load.

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

4. The boiler is suitable for fully pumped open vented central heating and domestic hot water systems and sealed systems.

5. A label giving details of the model, serial number and Gas Council number is situated on the rear of the lower door panel (Fig. 1).

6. The boiler data badge is positioned on the air box door (Fig. 2).

7. The boiler is intended to be installed in residential / commercial / light industrial E.M.C. 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 236921.

1.2 Important Information

Man-made mineral fibre

• Some component parts of this appliance (insulation pads, gaskets and rope seals) are manufactured from manmade mineral fibre.

• Prolonged or excessive exposure to this material may result in some irritation to the eyes, skin or respiratory tract.

• It is advisable to wear gloves when handling these items.

• Irritant dust will only be released from the items if they are broken up or subjected to severe abrasion. In these instances a suitable dust mask and goggles should be worn.

• Always thoroughly wash hands after installation, servicing or changing components.

• When disposing of any items manufactured from manmade mineral fibre care must be exercised.

• If any irritation of the eyes or severe irritation of the skin is experienced seek medical attention.

1.0 Introduction

Fig. 1

Data Badge

Air Box Door

Lower Door Panel

Position of Label

Fig. 2

2.0 General Layout

2.1 Layout (Figs. 3,4,5 & 6)

1. Wall Plate

2. Flue Elbow

3. Heat Exchanger

4. Burner

5. Air Box

6. Fan Protection Thermostat

7. Fan Assembly

8. Condensate Trap

9. PCB Housing Assembly

10. Gas Tap

11. Gas / Air Ratio Valve

12. Flow Pipe Connection

13. Return Pipe Connection

14. Flow Temperature Safety Thermostat - Black

15. Flow Temperature Thermistor - Red

16. Flow Switch (dry fire protection)

15 14

Fig. 4

Fig. 3

Fig. 5

Fig. 6

3.0 Appliance Operation

3.1

1. Switched Live On: When the switched live switches on if the flow temperature is less than the set point then pump overrun occurs. When the switched live switches on if the flow temperature is greater than the set point then pump overrun occurs.

2. Pump On: The pump is on while the fan, spark generator and gas valve are off. After 10 seconds if the flow switch has made then fan pre-purge occurs. After 10 seconds if the flow switch has not made then anticycle occurs.

3. Fan Pre-Purge: The pump and fan are on while the spark generator and gas valve are off. After 5 seconds ignition occurs.

4. Ignition: The pump, fan, spark generator and gas valve are on. If a flame is detected then burner on occurs. If a flame is not detected within 5 seconds and less than 5 ignition attempts have been made then fan purge occurs. If a flame is not detected within 5 seconds and 5 ignition attempts have been made then ignition lockout occurs.

5. Burner On: The pump, fan and gas valve are on while the spark generator is off. Flow temperature is controlled by varying the fan speed (and thereby the gas rate) to achieve optimum operation. If the flow temperature is greater than the set point or the TRVs all shut down then fan post purge occurs.

6. Fan Post Purge: The pump and fan are on while the spark generator and gas valve are off. After 5 seconds if the TRVs are not shut down then pump overrun occurs. After 5 seconds if the TRVs are shut down then anti-cycle occurs.

7. Pump Overrun: The pump is on while the fan, spark generator and gas valve are off. After 1 minute anticycle occurs.

8. Anti-cycle: The pump, fan, spark generator and gas valve are off. After 3 minutes if the flow temperature is less than the set point then pump on occurs. After 3 minutes if the flow temperature is greater than the set point then pump overrun occurs.

9. Ignition Lockout: The pump, fan, spark generator and gas valve are off. The boiler can only be reset by manually using the reset button.

Mains On.

Flow

temperature less

than set point ?

YES

5 second

Fan Pre-Purge.

Flame Detected ?

Burner On.

Ignition

Lockout.

5 second

Ignition Period.

All TRVs

shut down ?

Ignition done and 5 attempts made ?

Ignition done

and less than 5

attempts made ?

Flow switch made ?

YES

10 second Pump On.

All TRVs

shut or Flow temperature

greater than set point ?

5 second

Fan Post Purge.

1 minute

Pump Overrun.

3 minute

Anti-cycle.

YES

4.0 Technical Data

010203040

100

120

140

160

180

200

220

Water Flow Rate (litres/min)

Pressure Drop (mbar)

Pressure Drop (in wg)

Hydraulic Resistance Chart

Appliance Category CAT I

Horizontal Flue Terminal Diameter 110mm Dimensions Projection 150mm

Outercase Dimensions

Overall Height Inc Flue Elbow - 750mm Casing Height - 600mm Casing Width - 390mm Casing Depth - 320mm

Weights kg Packaged Boiler Carton 36.2 Packaged Flue Kit 3.6 Installation Lift Weight 26.0

Connections

Gas Supply -

/2in BSPT Central Heating Flow - 22mm Central Heating Return - 22mm Condensate Drain - 1 in BSP

Recommended System Temperature Drop

Condensing 20°C 36°F

Heat Input (Q)(Gross) Max Min

12 model kW 13.34 10.2

Btu/hr 45,518 34,840

15 model kW 16.88 10.2

Btu/hr 57,600 34,840

18 model kW 20.18 10.2

Btu/hr 68,850 34,840

24 model kW 24.50 10.2

Btu/hr 83,600 34,840

30 model kW 33.76 10.2 (see note) Btu/hr 115,200 34,840

Heat Output (P)

(Non Condensing 70° C Mean Water Temp)

Max Min

12 model kW 11.82 9.14

Btu/hr 40,330 31,180

15 model kW 15.24 9.14

Btu/hr 52,000 31,180

18 model kW 17.81 9.14

Btu/hr 60,770 31,180

24 model kW 22.00 9.14

Btu/hr 75,000 31,180

30 model kW 30.18 9.14

Btu/hr 102,980 31,180

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption 80W

External Fuse Rating 3A

Internal Fuse Rating (BS 4265)

Fuse 3.15 AT (PCB)

Inlet Pressure at Gas Valve (Natural Gas)

Min 18.1 mbar

Max 22.5 mbar

(see Section 12.1)

Injector (Natural Gas)

6.5mm Diameter

Clearances

(For unventilated compartments see Section 7.2)

Both Sides 5mm Min Above Casing 200mm Min Below Casing 50mm Min Front (For Servicing) 500mm Min Front (In Operation) 5mm Min

Appliance Type C

Nox Class 5

Heat Output (P)

(Condensing 40° C Mean Water Temp)

Max Min

12 model kW 12.81

Btu/hr 43,400

15 model kW 16.49 10.1

Btu/hr 56,260 34,520

18 model kW 19.27

Btu/hr 64,898

24 model kW 23.8 10.1

Btu/hr 81,200 34,520

30 model kW 32.61 10.1

Btu/hr 113,280 34,520

Water Content

litres 2.6 pints 4.6

Static Head

max 30 metres (100 ft) min 1 metre (3.25 ft)

Low Head 0.2m (8 in) min

System Detail

fully pumped open vented & sealed systems

Gas Connection

G1/2” B.S.P. Thread

Controls

boiler thermostat, safety thermostat, flow switch, electronic flame sensing, temperature protection thermostat & condensate blockage sensor

NOTE: The maximum output of the 30 model is factory set at 22.0kW (75,000 Btu/hr). This can be altered to 30.18kW (102,980 Btu/hr) - see section 10.8.

For 12 model - The efficiency is 90.5% For 15 model - The efficiency is 91.3% For 18 model - The efficiency is 90.4% For 24 model - The efficiency is 90.9% For 30 model - The efficiency is 90.9%

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 0087.

SEDBUK Declaration

Electrical Protection IPX2

CO/CO2 Ratio Up to a maximum

of 0.004

Flow Temperature (adjustable)

55° C to 78° C (± 5° C)

CO2 Level 9% ± 1%

Max Gas Rate (2H - G20 - 20mbar)

(After 10 Mins)

(12) (15) (18) (24) (30)

Btu/hr 40,950 52,000 61,400 75,000 102,980

/hr 1.34 1.64 1.94 2.31 2.95

/hr 47.3 52.1 68.5 83.3 104.2

5.0 Dimensions and Fixings

DIMENSIONS

A 600mm

B 320mm

C 390mm

D 125mm Ø Min.

E 150mm

F 125mm

SIDE FLUE (left and right)

For every 1m of horizontal flue length, the clearance above the top of the flue elbow should be 27.5mm to incorporate the 1.5° fall in the flue from the terminal to the elbow.

The 1.5° fall provided by the elbow is to allow condensate to run back to the boiler, for disposal through the condensate discharge pipe.

Flue length (Y)

up to 1m

1m - 2m

2m - 3m

Clearance (X)

27.5mm

55mm

82.5mm

360° Orientation

Tube Ø 110mm

1.5°

Fig. 7

Fig. 8

6.0 System Details

6.1 Water Circulating Systems

1. The appliance is suitable for use with open vent fully pumped systems and sealed systems .

The following conditions should be observed on all systems:

• The static head must not exceed 30m (100ft) of water.

• The boiler must not be used with a direct cylinder.

• Drain cocks should be fitted to all system low points.

• All gas and water pipes and electrical wiring must be installed in a way which would not restrict the servicing of the boiler.

• Position isolating valves as close to circulating pump as possible.

• It is recommended that the return pipe is fitted with an automatic air vent as close to the boiler as is practical.

6.2 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 be suitable for aluminium and 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.

6.0 System Details

6.3 Pipework

1. The sizes of flow and return pipes from the boiler should be determined by normal methods, according to the requirements of the system. The connection to the boiler will accept 22mm pipe.

2. A 20 °C (36°F) drop in temperature across the system is recommended for condensing boilers. Existing radiators may be oversized and so allow this, but where radiator sizing is marginal it may be advisable to retain a system temperature drop of 11°C (20°F).

NOTE: On Solo 30 HE models 28mm pipe should be used to connect to the boiler flow and return.

3. In systems using non-metallic pipework it is necessary to use copper pipe for the boiler Flow and Return. The copper must extend at least 1 metre from the boiler and include any branches (Fig. 9).

6.4

Low Head Installation

1. Using a close couple arrangement the minimum head is as shown in the diagrams (Figs. 10 & 11) subject to the following conditions:

a) The pump being adjusted to give a 20°C drop across

the boiler. b) The pump must be fitted on the flow. c) The pump must be fitted in accordance with the

pump manufacturer's instructions. d) The open vent pipe must be taken up from a tee in a

horizontal section of the flow pipe.

An alternative Low Head Installation (Fig. 12)

2. For heads below 400mm then a combined vent and feed pipe may be connected. This must be a minimum of 22mm diameter. It is recommended that an air separator is fitted when using a combined feed and vent pipe.

6.5 Pump

1. Providing that the cold feed and open vent pipe are positioned correctly (e.g. the system is not prone to pumping over, air entrainment etc.) the pump may be fitted on the primary return pipe.

Typical Low Head Installation

If Conditions Require,

This System Possible

Alternative Low Head Installation

Boiler

500mm

45°

22mm Open Vent

1000mm

Min

150mm

Max

15mm Cold Feed

400mm

Min Head

Return

Pump

Flow

Boiler

500mm

45°

22mm Open Vent

400mm

Min Head

1000mm

Min

Automatic Air

Vent

15mm Cold Feed

150mm

Max

Return

Pump

Flow

Return

Pump

Flow

Boiler

200mm

Min

Air

Separator

22mm Feed & Vent Pipe

Fig. 10

Fig. 11

Fig. 12

Boiler

Flow

Return

Copper

0.5m

Copper

0.5m

Fig. 9

6.0 System Details

6.5 System Controls

This boiler does not require a bypass. This boiler does not require a permanent live. The pump only needs wiring directly to the boiler for fully TRV’d systems.

1. To comply with Part L1 of the Building Regulations the heating system into which the boiler is installed should include the following:

a) zone controls b) timing controls c) boiler control interlocks

2. Such a system needs to be fully pumped and must provide independent temperature and time control to both the heating and hot water circuits and have a boiler interlock.

3. The boiler should be controlled so that it operates on demand only. Where it is proposed to effect control by thermostatic radiator valves, a room thermostat (or other device such as a flow switch - a flow switch is integral to this boiler) should also be provided to switch off the boiler when there is no demand for heating or hot water.

4. The interlock for the CH circuit can be provided by either a Room Thermostat or a fully TRV’d system with the pump wired back to the boiler without a bypass. Connection diagrams for both options for Y and S plan systems are shown.

Y Plan

Diverter

Valve

Cylinder

Stat

Room

Stat

Boiler

Pump

Timer

230V 50Hz

LNE

L N

CH on HW on HW off

LNE

L N P/FE

g/y

S Plan Valve

Cylinder

Stat

Room

Stat

Boiler

Pump

Timer

230V 50Hz

LNE

L N

CH on HW on

LNE

L N P/FE

Motor

S Plan

Valve

Motor

g/y

Y Plan

Diverter

Valve

Cylinder

Stat

Boiler

Pump

Timer

230V 50Hz

LNE

L N

CH on HW on

HW off

LNE

L N P/FE

g/y

S Plan

Valve

Cylinder

Stat

Boiler

Pump

Timer

230V 50Hz

LNE

L N

CH on

HW on

LNE

L N P/FE

Motor

S Plan Valve

Motor

g/y

Y Plan, Room Thermostat System, CH Interlocked By Room Thermostat

At least the Radiator(s) near the Room Thermostat not TRV’d Pump run from Switched Live By-pass permitted but not required for Part L1 compliance

S Plan, Room Thermostat System, CH Interlocked By Room Thermostat

At least the Radiator(s) near the Room Thermostat not TRV’d Pump run from Switched Live By-pass permitted but not required for Part L1 compliance

Y Plan, Fully TRV’d System, CH Interlocked By Boiler Flow Switch

Room Thermostat should not be fitted Pump must be run from Boiler P/F connection for Part L1 compliance By-pass not permitted (must be valved off) for Part L1 compliance

S Plan, Fully TRV’d System, CH Interlocked By Boiler Flow Switch

Room Thermostat should not be fitted Pump must be run from Boiler P/F connection for Part L1 compliance By-pass not permitted (must be valved off) for Part L1 compliance

Key to colours

b - Blue br - Brown w - White o - Orange gr - Grey g/y - Green/Yellow

6.0 System Details

6.7 Sealed Systems (Fig. 13)

1. SAFETY VALVE - A safety valve complying with the requirements of BS 6750 Part 1 must be fitted close to the boiler on the flow pipe by means of a horizontal or vertically upward connection with no intervening valve or restrictions and should be positioned to facilitate testing. The valve should be pre-set and non-adjustable to operate at a pressure of 3 bar (45 Ibf/in

). It must be arranged to discharge any water or steam through a pipe to a safe outlet position.

2. PRESSURE GAUGE - A pressure gauge of minimum range 0-4 bar (0-60 Ibf/in2) with a fill pressure indicator must be fitted to the system, preferably at the same point as the expansion vessel in an easily visible position.

3. EXPANSION VESSEL - An expansion vessel complying with the requirements of BS 4814 must be fitted to the system by means of a connection close to the inlet side of the circulating pump in accordance with the manufacturers instructions, the connecting pipe being unrestricted and not less than 15mm (

/2in) nominal size. The volume of the vessel should be suitable for the system water content and the nitrogen or air charge pressure should not be less than the system static head (See Table. 1).

Further details of sealed system design can be obtained from BS 5449 and the British Gas publication entitled 'Specifications for Domestic Wet Central Heating Systems'.

4. FILLING POINT - 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. The sealed primary circuits may be filled or replenished by means of a temporary connection between the primary 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. The filling method adopted must be in accordance with all relevant water supply regulations and use approved equipment. 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. MAKE UP SYSTEM - A method of replacing water lost from the system should be provided either by means of a make up vessel of not more than 3 litres (5 pints) capacity, mounted above the highest point of the system, or by re-pressurisation of the system.

6. VENTING - A method of venting the system during filling and commissioning must be provided by fitting automatic air vents or by venting manually.

7. HOT WATER STORAGE - The hot water storage vessel must be of the indirect coil type. All components used in the system must be suitable for operation at 110°C (230°F) and at the pressure allowed by the safety valve.

Safety

Valve

Pressure

Gauge

Pump

Filling Point

Air

Vent

3 Litre Top Up Bottle (if required)

Radiator Circuit

Expansion Vessel

System Drains at Low Point

Max Boiler Flow

Temp = 82° C

Boiler

Fig. 13

Table. 1

Vessel Charge Pressure (Bar)

0.5

1.0

1.5

Initial System

Pressure (Bar)

0.5

1.0

1.5

2.0

1.0

1.5

2.0

1.5

2.0

Multiply Total

Water Content Of

System By (Litres)

0.067

0.112

0.207

0.441

0.087

0.152

0.330

0.125

0.265

Method of determining minimum valve of

expansion vessel volume for sealed systems

using Baxi Boilers

System Volume = 75 litres Vessel Charge Pressure = 1.0 bar Initial System Pressure = 1.5 bar 75 x 0.152 = 11.4 litres Expansion Vessel Volume

Example :-

Then :-

NOTE

Where a vessel of the calculated size is not obtainable then

the next available larger size should be used.

Stop Valve

Double Check Valve

DHW Mains Inlet

CH Return

Temporary Hose

Stop Valve

Fig. 14

7.0 Site Requirements

7.1 Location

NOTE: Due to the high efficiency of the boiler a plume of water vapour will be discharged from the flue. This should be taken into account when siting the flue terminal.

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 7.2).

2. If the boiler is sited in an unheated enclosure then it is recommended to incorporate an appropriate device for frost protection in the system controls.

3. If the boiler is fitted in a room containing a bath or shower, it can only be fitted in zone 3, (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.

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 Ventilation of Compartments

1. Where the boiler is installed in a cupboard or compartment, no air vents are required for cooling purposes providing that the minimum dimensions below are maintained.

Sides 15mm Top 200mm Bottom 50mm Front 30mm

2. If the boiler is installed in a smaller cupboard or compartment it must be ventilated according to BS 5440 Part 2 and the minimum clearances given in section 4.0 “Technical Data” maintained.

3. Any compartment should be large enough to house the boiler only.

NOTE: The ventilation label on the front of the outer case MUST NOT BE REMOVED when the appliance is installed in a compartment or cupboard.

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

7.0 Site Requirements

7.3 Clearances (Figs. 15 &16)

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.

3. For unventilated compartments see Section 7.2.

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

/2in BSPF.

3. Ensure that the pipework from the meter to the appliance is of adequate size to ensure correct operation.

Do not use pipes of a smaller diameter than the boiler gas connection.

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 is 230V ~ 50Hz fused at 3A.

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

Note! There is no method of isolating the boiler, at the user interface.

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.

WARNING: The PCB Control and Fan Assembly are 325 Vdc. Isolate at supply before access.

50mm

600mm

390mm

200mm

5mm Min

5mm

500mm

For Servicing

Purposes

Fig. 15

Fig. 16

In Operation

1.5°

320mm

7.0 Site Requirements

7.6 Condensate Drain

FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER

The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST

2.5° (50mm per metre) along the entire run.

NOTE: It is unnecessary to fit an air break in the discharge pipe.

1. The condensate outlet terminates in a 1” BSP nut and seal for the connection of 21.5mm (

/4in) plastic overflow pipe which should generally discharge internally into the household drainage system. If this is not possible, discharge into an outside drain is acceptable.

2. Ensure the discharge of condensate complies with any national or local regulations in force.

BS 6798:2000 & Part H1 of the Building Regulations give further guidance.

3. The discharge pipe should be run in a proprietary drain pipe material e.g. PVC, PVC-U, ABS, PVC-C or PP.

4. Metal pipework is NOT suitable for use in condensate discharge systems.

5. The pipe should be a minimum of 21.5mm diameter and must be supported using suitably spaced clips to prevent sagging.

6. It is advisable to keep the condensate pipe internal.

7. External runs greater than 3 metres or runs in cold areas

should use 32mm waste pipe.

8. If the boiler is fitted in an unheated location the entire condensate discharge pipe should be treated as an external run.

9. In all cases discharge pipe must be installed to aid disposal of the condensate. To reduce the risk of condensate being trapped, as few bends and fittings as possible should be used.

10. When discharging condensate into a soil stack or waste pipe the effects of existing plumbing must be considered. If soil pipes or waste pipes are subjected to internal pressure fluctuations when WC's are flushed or sinks emptied then back-pressure may force water out of the boiler trap and cause appliance lockout.

Examples are shown of the following methods of termination:i) to an internal soil & vent pipe ii) via an internal discharge branch (e.g. sink waste) iii) to a drain or gully iv) to a purpose made soakaway

Boiler

2.5° Minimum fall

Termination to an internal soil and

vent pipe

450mm min

Boiler

2.5° Minimum fall

External termination via internal discharge

branch

e.g sink waste - downstream

Sink

Pipe must terminate above water level but below surrounding surface

Boiler

Pipe must terminate above water level but below surrounding surface

2.5° Minimum fall

Termination to a drain or gully

Boiler

500mm min

2.5° Minimum fall

Termination to a purpose made soak-

away

Holes in the soak-away must face away from the building

50mm per metre of pipe run

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Baxi Solo 12 HE, Solo 18 HE, Solo 15 HE, Solo 24 HE, Solo 30 HE Installation And Servicing Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual