Baxi Solo He A Quick Start Guide 7204218

2014-09-24

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Solo HE ARange

Wall Mounted Powered Flue Condensing

Boilers Gas Fired Central Heating Units

Installation & Servicing Instructions

These instructions include the Benchmark Commissioning Checklist

and should be left with the user for safe keeping.

2© Baxi Heating UK Ltd 2014

Natural Gas

Baxi Solo 12 HE A

G.C.No41 075 65

Baxi Solo 15 HE A

G.C.No41 075 66

Baxi Solo 18 HE A

G.C.No41 075 67

Baxi Solo 24 HE A

G.C.No41 075 68

Baxi Solo 30 HE A

G.C.No41 075 69

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Benchmark Logbook is being withdrawn.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.

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.

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.

WARNING: Any person who does any unauthorised act in relation to a

0086

ISO 9001

FM 00866

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.

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

‘Gas Safe Register’ will issue a

Building Regulations Compliance

Certificate to the property owner

and inform the relevant LABC

You must ensure that the

certificate number issued by

the ‘Gas Safe Register’ is written

onto the Benchmark Checklist

Scheme Members only

Call ‘Gas Safe Register’ on:

0800 408 5577

or log onto:

www.gassaferegister.co.uk

within 10 days

If you notify via the ‘Gas Safe

the Building Regulations

certificate on members’ 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

4© Baxi Heating UK Ltd 2014

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.

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, 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 EN 12828 Heating systems in buildings.

BS EN 12831 Heating systems in buildings - calculations of load

BS EN 14336 Installation & commissioning of water based

heating 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 EN 12828 Heating systems in buildings.

BS EN 12831 Heating systems in buildings - calculations of load

BS EN 14336 Installation & commissioning of water based

heating 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 No3083” 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.

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.

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

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 21

9.0 Plume Displacement 26

10.0 Installation 30

11.0 Electrical 36

12.0 Commissioning the Boiler 38

13.0 Fitting the Outer Case 41

14.0 Servicing the Boiler 42

15.0 Changing Components 45

16.0 Short Parts List 51

17.0 Fault Finding 52

Benchmark Checklist 58

Section Page

Contents

Contents of Pack

The pack contains:-

• Boiler

• Wall Plate

• Template & ‘Quick Fit’ Guide

• Literature Pack

• Fittings Pack

1.0 Introduction

Fig. 1

Data Badge

Air Box Door

Lower Door Panel Position of Label

Fig. 2

1.1 Description

1. The Baxi Solo HE Arange are gas fired room sealed fan

assisted condensing central heating boilers.

2. The maximum outputs of the Baxi Solo models are:-

12 HE A- 11.82 kW (Non Condensing)

12.81 kW (Condensing)

15 HE A- 15.24 kW (Non Condensing)

16.49 kW (Condensing)

18 HE A- 17.81 kW (Non Condensing)

19.27 kW (Condensing)

24 HE A- 22.0 kW (Non Condensing)

23.8 kW (Condensing)

30 HE A- 30.18 kW (Non Condensing)

32.61 kW (Condensing)

Note: 30 HE Ais pre-set at 22.0/23.8 kW - see section 10.8 for

adjustment details. All boilers automatically adjust output

according to system load.

3. The boiler 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 / 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 236921.

1.2 Important Information

Man-made mineral fibre

• Some component parts of this appliance (insulation pads,

gaskets and rope seals) are manufactured from man-made

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 man-made

mineral fibre care must be exercised.

• If any irritation of the eyes or severe irritation of the skin is

experienced seek medical attention.

8© Baxi Heating UK Ltd 2014

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 anti-

cycle 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 anti-

cycle 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

10 © Baxi Heating UK Ltd 2014

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 2H

Horizontal

Flue Terminal Diameter 110mm

Dimensions Projection 150mm

Outercase Dimensions

Overall Height Inc Flue Elbow - 750mm

Casing Height - 600mm

Casing Width - 390mm

Casing Depth - 285 mm

Weights kg

Packaged Boiler Carton 36.2

Packaged Flue Kit 3.6

Installation Lift Weight 26.0

Connections

Gas Supply - 1/2in 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

15 model kW 16.88 10.2

18 model kW 20.18 10.2

24 model kW 24.50 10.2

30 model kW 33.76 10.2

(see note)

Heat Output (P)

(Non Condensing 70° C Mean Water Temp)

Max Min

12 model kW 11.82 9.14

15 model kW 15.24 9.14

18 model kW 17.81 9.14

24 model kW 22.00 9.14

30 model kW 30.18 9.14

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 C13 C33 C53

Nox Class 5

Heat Output (P)

(Condensing 40° C Mean Water Temp)

Max Min

12 model kW 12.81

15 model kW 16.49 10.1

18 model kW 19.27

24 model kW 23.8 10.1

30 model kW 32.61 10.1

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. This can

be altered to 30.18kW - 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 0086.

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)

m3/hr 1.34 1.64 1.94 2.31 2.95

NOTE: All data in this section are nominal values

and subject to normal production tolerances

5.0 Dimensions and Fixings

DIMENSIONS

A600mm

B285mm

C390mm

D125mm Ø Min.

E150mm

F96mm

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

At least

1.5°

At least

1.5°

Fig. 7

Fig. 8

6.0 System Details

12 © Baxi Heating UK Ltd 2014

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, 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.

6.0 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 on the

boiler are 22mm.

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 Amodels 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

14 © Baxi Heating UK Ltd 2014

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

CH on

HW on

HW off

LNE

L N P/FE

g/y w

g/y

S Plan

Valve

Cylinder

Stat

Room

Stat

Boiler

Pump

Timer

230V

50Hz

LNE

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

CH on

HW on

HW off

LNE

L N P/FE

g/y

S Plan

Valve

Cylinder

Stat

Boiler

Pump

Timer

230V

50Hz

LNE

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/in2). 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 (1/2in) 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

Return

Temporary

Hose

Stop

Valve

Fig. 14

7.0 Site Requirements

16 © Baxi Heating UK Ltd 2014

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 MUST NOT BE fitted in zone 0, 1 or 2, ONLY

within the shaded area (Figs. A & B 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.

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

Window

Recess

Window

Recess

0.6 m

Ceiling

Outside Zones

Zone 2

Zone 1

Zone 0

2.25 m

0.6 m

Fig. A

Fig. B

In GB Only

Window Recess

Zone 2

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 1/2in 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

At least

1.5°

285mm

7.0 Site Requirements

18 © Baxi Heating UK Ltd 2014

7.6 Condensate Drain

FAILURE TO INSTALL THE CONDENSATE DISCHARGE

PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE

OPERATION OF THE BOILER.

CAREFUL CONSIDERATION MUST BE GIVEN TO THE

POSSIBILITY OF THE PIPEWORK BEING SUBJECT TO

FREEZING CONDITIONS AND APPROPRIATE

MEASURES TAKEN TO PREVENT BLOCKAGE.

CORRECT INSTALLATION IN ACCORDANCE WITH

THIS SECTION WILL CONSIDERABLY MINIMISE THE

LIKELIHOOD OF BLOCKAGE AND SUBSEQUENT

BOILER LOCK-OUT.

A CONDENSATE DISCHARGE PUMP AND PIPE ‘TRACE

HEATING’ ARE AVAILABLE AS ACCESSORIES - see

paragraphs 7.7.12 to 7.715 for further details.

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 EXCEPT when

employing a suitable condensate pump in basement and

cellar or similar applications.

The boiler condensate trap incorporates a seal of 75mm,

therefore it is unnecessary to install an air break and trap in

the discharge pipework.

1. The condensate outlet will accept 21.5mm (3/4in) plastic

overflow pipe. It is strongly recommended that this discharges

internally into the household drainage system.

Where this is not possible, discharge into an outside drain is

permissible providing every possible precaution is taken to

prevent freezing.

2. Ensure the discharge of condensate complies with any

national or local regulations in force. BS 6798 & Part H1 of the

Building Regulations give further detailed 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 of the correct

design to prevent sagging.

6. It is advisable that the full length of condensate pipe is run

internally and preferably be less than 3 metres.

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

should use 32mm waste pipe.

8. External runs MUST be a MINIMUM of 32mm and fully

insulated with material suitable for external use.

9. If the boiler is fitted in an unheated location the entire

condensate discharge pipe should be treated as an external run

and sized and insulated accordingly.

10. 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

and any burrs on cut pipe removed.

11. 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.

21.5mm

2.5° Minimum fall

i) Termination to an internal soil and

vent pipe

450mm min*

Boiler

2.5° Minimum fall

ii) External termination via internal discharge branch

e.g sink waste - downstream*

Sink

Pipe must terminate above

water level but below

surrounding surface. Cut

end at 45°

50mm per metre of pipe run

*450mm is applicable to properties

up to 3 storeys.

For multi-storey building installations

consult BS 6798.

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) downstream of the trap

iii) to a drain or gully

iv) to a purpose made soakaway

v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap

vi) pumped into an external soil & vent pipe

vii) to a drain or gully with extended external run & trace heating

It is strongly recommended to discharge internally into the household

drainage system. If connecting to a rain water drain, that drain MUST

discharge into a foul drain.

*It is NOT RECOMMENDED

to connect upstream of the

sink or other waste water

receptacle !

32mm Insulation

Boiler

2.5° Minimum fall

iii) Termination to a drain or gully

50mm per metre of pipe run

Pipe must terminate above

water level but below

surrounding surface. Cut

end at 45°

Boiler

500mm min

2.5° Minimum fall

iv) Termination to a purpose made soakaway

Holes in the soak-away must

face away from the building

50mm per metre of pipe run

Further specific requirements for soakaway

design are referred to in BS 6798.

7.0 Site Requirements

7.6 Condensate Drain (cont.)

12. A boiler discharge pump is available, ‘MULTIFIT’

part no. 720648301. This pump will dispose of both

condensate & high temperature water from the relief valve.

It has a maximum head of 5 metres. Follow the instructions

supplied with the pump.

13. Condensate Drain Pipe ‘Trace Heating’ Elements are

available in various lengths. ‘MULTIFIT’ part nos.:-

1 metre 720644401

2 metre 720664101

3 metre 720664201

5 metre 720664401*

*Where the drain is between 3 & 5 metres a 5 metre kit can

be used and “doubled back” upon itself.

14. It is possible to fit the element externally on the

condensate drain or internally as detailed in the instructions

provided.

15. The fitting of a ‘Trace Heating’ Element is NOT a

substitute for correct installation of the condensate drain.

ALL requirements in this section must still be adhered to.

Boiler

vi) pumped into an external soil & vent pipe

2.5° Minimum fall

50mm per metre of pipe run

Condensate Pump

Unheated Location

(e.g. Garage)

Basement or similar

(heated)

Boiler

2.5° Minimum fall

50mm per metre of pipe run

Pipe must terminate above

water level but below

surrounding surface. Cut

end at 45°

The ‘Trace Heating’ element

must be installed in accordance

with the instructions supplied.

External runs & those in

unheated locations still require

insulation.

vii) to a drain or gully with extended

external run & trace heating

Boiler

v) pumped into an internal discharge branch

(e.g. sink waste) downstream of the trap

Pipe must terminate above

water level but below

surrounding surface. Cut

end at 45°

2.5° Minimum fall

50mm per metre of pipe run

Condensate Pump

Sink

Basement or similar

(heated)

7.0 Site Requirements

20 © Baxi Heating UK Ltd 2014

AAF

J,K

Likely flue positions requiring

a flue terminal guard

J,K

7.7 Flue

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 following guidelines indicate the general requirements

for siting balanced flue terminals. For GB recommendations are

given in BS 5440 Pt.1. For IE recommendations are given in the

current edition of I.S. 813 “Domestic Gas Installations”.

2. If the terminal discharges onto a pathway or passageway,

check that combustion products will not cause a nuisance and

that the terminal will not obstruct the passageway.

3. Take into consideration the effect the plume of vapour may

have on neighbours when siting the flue.

4. Adjacent surfaces close to the flue terminal may need

protection from the effects of condensation. Alternatively a flue

deflector kit (part no. 248167) is available.

5. For installation of the flue into an internal corner at the

25mm dimension the flue deflector kit (part no. 248167) must

be fitted.

6. * Reduction to the boundary is possible down to 25mm but

the flue deflector kit (part no. 248167) must be fitted.

7. If required a suitable terminal guard is available from Baxi for

use with the flue deflector.

8. For fitting under low soffits and eaves it is acceptable for the

flue to project up to 500mm from the face of the wall to the

inside of the air intake. This can be painted if required using a

suitable external paint.

9. If a terminal is less than 2 metres (783/4in) above a balcony,

above ground or above a flat roof to which people have access,

then a suitable terminal guard must be provided.

IMPORTANT:

• Under car ports we recommend the use of the plume

displacement kit.

• The terminal position must ensure the safe and

nuisance - free dispersal of combustion products.

Fig. 17

Fig. 16a

300 min

Terminal

Assembly

Top View Rear Flue

Property Boundary Line

NOTE: The distance from a fanned draught appliance terminal

installed parallel to a boundary may not be less than 300mm in

accordance with the diagram below

Opening Window

or Door

150mm

MIN.

Fig. 17c

Plume

Displacement Kit

Air Inlet

IMPORTANT: If fitting a Plume

Displacement Flue Kit, the air inlet

must be a minimum of 150mm from

any opening windows or doors (see

Section 9.0).

Terminal Position with Minimum Distance (Fig. 17) (mm)

A1Directly below an opening, air brick, opening

windows, etc. 300

B1Above an opening, air brick, opening window etc. 300

C1Horizontally to an opening, air brick, opening window etc. 300

D2Below gutters, soil pipes or drain pipes. 25 (75)

E2Below eaves. 25 (200)

F2Below balconies or car port roof. 25 (200)

G2From a vertical drain pipe or soil pipe. 25 (150)

H2From an internal (i) or external (ii) corner. (i) 25 (300) (ii) 115

I Above ground, roof or balcony level. 300

J From a surface or boundary line facing a terminal. 600

K From a terminal facing a terminal (Horizontal flue). 1200

From a terminal facing a terminal (Vertical flue). 600

L From an opening in carport (e.g. door, window)

into the dwelling. 1200

M Vertically from a terminal on the same wall. 1500

N Horizontally from a terminal on the same wall. 300

R From adjacent wall to flue (vertical only). 300

S From an adjacent opening window (vertical only). 1000

T Adjacent to windows or openings on pitched and flat roofs 600

U Below windows or openings on pitched roofs 2000

1In addition, the terminal should be no nearer than 150 mm to an opening in the

building fabric formed for the purpose of accommodating a built-in element such as

a window frame.

2Only ONE 25mm clearance is allowed per installation. If one of the dimensions

D, E, F, G or H is 25mm then the remainder MUST be as B.S.5440-1.

8.0 Flue Options

8.1 Horizontal Flue Systems

Concentric

The maximum equivalent lengths are 4m (horizontal) or

(vertical). Their lengths exclude the standard elbow and

flue/terminal assembly (horizontal) and terminal assembly

(vertical).

Any additional “in line” bends in the flue system must be

taken into consideration. Their equivalent lengths are:

Concentric Pipes: 45° bend 0.5 m

93° bend 1.0 m

NOTE: Flue length is measured from point X to Y as

shown.

IMPORTANT: All flue systems must be securely

supported at least once every metre. Suitable pipe

supports are available as accessories.

Plume Displacement 70/110 dia Kit

1M Extensions, 45° & 93° bends

are also available - see Section 9.0

NOTE: Horizontal flue pipes should always be installed with a 1.5° fall from the

terminal to allow condensate to run back to the boiler.

This bend is equivalent to

0.5 metre

Total equivalent length (up to 4m) =

A+B+2x45°Bends

This bend is equivalent to

0.5 metre

Horizontal

Flue System Examples

8.0 Flue Options

22 © Baxi Heating UK Ltd 2014

8.2 Twin & Vertical Flue Systems

Concentric

The maximum equivalent lengths are 4m (vertical). Their

lengths exclude the standard elbow and terminal assembly

(vertical).

Twin Flue

The total maximum equivalent flue length is 150m.

NOTE: Each 1m of flue duct should be calculated as 2m.

Any additional “in line” bends in the flue system must be

taken into consideration. Their equivalent lengths are:

Concentric Pipes: 135° bend 0.5 m

93° bend 1.0 m

Twin Flue Pipe: 135° bend (air duct) 1.3 m

135° bend (flue duct) 2.6 m

90° bend (air duct) 4.8 m

90° bend (flue duct) 9.6 m

IMPORTANT: All flue systems must be securely

supported at least once every metre. Suitable pipe

supports are available as accessories.

The total equivalent length

for this example is

17.2 + 34.4 = 51.6 metres.

1m extension

135°bend

91.5°bend

1.3m

4.8m

5.0m

2.6m

9.6m

AIR DUCT

Noof

fittings/pipes

Sub total

Equivalent

Length Value

Equivalent Length Air Duct = 17.2m

1m extension

135°bend

91.5°bend

2.6m

9.6m

10.0m

5.2m

19.2m

FLUE DUCT

Noof

fittings/pipes

Sub total

Equivalent

Length Value

Equivalent Length Flue Duct = 34.4m

Roof

Terminal

This bend is equivalent to

1 metre

Total Equivalent Length =

A+B+C+1x90°Bend

All vertical and angled runs must be included,

measured from the boiler adaptor (point X) to the

joint with the flue terminal (point Y). One 91.5°

bend or two 135° bends can be included without

reduction of the flue length.

If further elbows are required the flue length must

be reduced by the following amounts:-

1 metre for each 91.5° bend

0.5 metre for each 135° bend

Vertical Flue

System Examples

Vertical Flue System

Examples (Twin Pipe)

8.0 Flue Options

Key Accessory Size Code No

FLUE GROUP B

Concentric Flue System 110mm diameter

A1 Horizontal Flue Terminal 850mm 243013BAX

A Horizontal Flue Terminal (incl elbow) 236921

B Flue Extension 1000mm 241695

500mm 241694

250mm 241692

C Flue Bend 93° 241687

D Flue Bend (pair) 135° 241689

U Pipe Support 110mm 243014BAX

T Vertical Flue Boiler Adaptor 5106888

S Flue Terminal Deflector 248167

FLUE GROUP P

Twin Flue System 80mm diameter

E Flue Extension 1000mm 246137

500mm 246136

250mm 246135

F Flue Bend (pair) 90° 5121560

G Flue Bend (2 pair) 135° 5121561

J Vertical Flue Boiler Adaptor Kit 242757

W Pipe Support (pair) 80mm 5111081

FLUE GROUP B,P

Vertical Flue Kits

K Vertical Flue Terminal 242802

L Pitched Roof Flashing 25°/50° 243015

M Roof Cover Plate 243131

N Flat Roof Flashing 243016BAX

AA1 B

U,W

8.3 Flue Accessories

8.0 Flue Options

24 © Baxi Heating UK Ltd 2014

Vertical Flue

Adaptor

Gasket

8.4 For Vertical Flue Systems

1. Undo the screws securing the blanking plate to the

boiler top panel. Discard the plate.

2. Fix the vertical adaptor and gasket to the top panel with

the previously removed screws.

8.5 For Twin Flue Systems

1. Undo the screws securing the blanking plate to the

boiler top panel. Discard the plate.

2. Fix both the air and flue adaptors with their gaskets

onto the boiler top panel. Secure with screws.

For Vertical Flues

For Twin Flues

Air Duct

Adaptor

Flue Duct

Adaptor

Gasket

8.0 Flue Options

8.6 For Roof Terminals

1. In the case of a pitched roof 25 - 50 degrees, position

the lead tile to replace/flash over existing roof tiling. Make

an aperture in the roof suitable for the lower tube of the

roof terminal and ensure the integrity of the roof cover is

maintained. The adjustable plastic collar can either be

positioned on the lead tile or the lower tube of the roof

terminal prior to the final positioning of the vertical flue

through the tile. Check the collar is correctly located to suit

required roof pitch (either 25° to 38° or 37° to 50°). From

inside the roof adjust the flue to a vertical position and

secure to the roof structure with the clamp supplied.

2. For flat roof installations the aluminium flashing must be

incorporated into the roof covering and the appropriate

aperture made in the roof decking. The vertical flue is

lowered onto the flashing making sure the collar of the flue

locates securely with the flashing. (A mastic seal may be

necessary). From inside the roof, adjust the flue to a vertical

position and secure to the roof structure with the clamp

supplied.

IMPORTANT: If the boiler is not fitted immediately

after the flue system, temporary precautions must be

taken to prevent rain entry into the room of installation.

Any precautionary measures must be removed prior to

commissioning the boiler.

8.7 Flue Dimensions

The standard horizontal flue kit allows for flue lengths

between 270mm (105/8”) and 800mm (32”) from elbow to

terminal (Fig. 18).

The maximum permissible equivalent flue length is: 4

metres.

NOTE: Each additional 45° of flue bend will account

for an equivalent flue length of 0.5m.

eg. 45° = 0.5m, 90° = 2 x 45° = 1m etc.

8.8 Terminal Guard (Fig. 19)

1. When codes of practice dictate the use of terminal

guards, they can be obtained from most Plumbers’ and

Builders’ Merchants.

2. When ordering a terminal guard, quote the appliance

model number.

3. The flue terminal guard should be positioned centrally

over the terminal and fixed as illustrated.

8.9 Flue Deflector (Fig. 18a)

1. If required, push the flue deflector over the terminal end

and rotate to the optimum angle for deflecting plume.

Secure the deflector to the terminal with screws provided.

Fig. 18

Fig. 19

270mm 800mm

Push Fit Adaptor

Air Duct

Flue Duct

Cut the same

amount off the

Air Duct &

Flue Duct

Approx

1425mm

Flue Deflector

Fig. 18a

9.0 Plume Displacement

26 © Baxi Heating UK Ltd 2014

9.1 Plume Displacement Kit (P.D.K.)

Kit No 5121371

Content of kit

1 70/110 Concentric Flue

1 1m 70 Dia Exhaust Flue Pipe

2 Support Brackets

1 93° Elbow/Plume Outlet Assembly

1 Flue Trim

2 “O” Rings

1 Elbow with Gasket

1. This kit is recommended for installations where the

condensate plume emitted from the flue may cause a nuisance

or affect the surroundings.

2. The terminal must be positioned outside the building with

the outlet connection upwards.

3. The 70Ø pipe connects to the outlet of the concentric

terminal assembly. The elbow/plume outlet must be fitted to

the end of the 70Ø pipe.

NOTE: The plume outlet must always be at least 45° to

the wall, with the ‘peak’ uppermost to prevent rain entry

(Figs. A & B), and be at least 2 metres above ground level.

It must be secured as shown in Fig. C.

The outlet must be positioned so that any condensate

plume is directed away from adjacent surfaces.

4. It is possible to reduce or increase (with the addition of

extensions) the length of either or both the 70/110 concentric

and 70Ø exhaust.

5. Standard concentric flue extension kits may be added

between the boiler elbow and the terminal assembly.

6. The minimum length of the concentric flue is 100mm when

measured from the edge of the boiler flue elbow. There is a

further 45mm engagement into the elbow.

IMPORTANT: The maximum equivalent length of

concentric flue is:- 4 metres

Additional elbows may be fitted in the concentric flue, but

the equivalent length must be reduced by 1 metre (93°

elbow) or 0.5 metres (45° elbow).

7. 70Ø 1 metre extensions (including support bracket), and

additional 93° & 45° elbows are available. Any additional 93°

& 45° elbows must be accounted for when calculating flue

lengths. 70Ø 93° elbows are equivalent to 3.5 metres of

straight length and 45° elbows to 1 metre.

NOTE: Permitted positions of the plume outlet relative to

doors, windows etc. are the same as for conventional

concentric flues as detailed in the main Installation &

Servicing Instructions and BS5440 Pt. 1. It is NOT

necessary to fit a terminal guard over the air inlet or the

plume outlet.

Outlet Connection

upwards

‘Peak’ MUST be

Uppermost

Fig. A

Fig. B

500mm Min.

45°

45° Outlet must be

at least 45° from

wall face

Plume Outlet (‘Peak’

MUST be Uppermost)

0.94 metre

Fig. C

9.0 Plume Displacement

70Ø Exhaust (metres)

Concentric 70/110 Flue (metres)

234

12, 15, 18 & 24

70Ø Exhaust (metres)

Concentric 70/110 Flue (metres)

234

12, 15, 18 & 24

70Ø Exhaust (metres)

Concentric 70/110 Flue (metres)

234

12, 15, 18 & 24

Flue Length - Worked Example

Baxi Solo 30 HE A

In Fig. D opposite an additional 93° elbow and pair of 45°

elbows have been included in the 70Ø exhaust.

Also 3 straight extension pieces have been used.

To calculate total length:-

Length of 70Ø supplied in kit = 1 metre

3 x 1 metre Extensions = 3 metres

1 x 93° Elbow = 1 metre

2 x 45° Elbow = 1 metre (0.5 metres each)

Total 70Ø = 6 metres

After consulting the table in Example 3 it can be determined

that the concentric flue could be up to approximately 3.25

metres long.

Concentric Flue

Support

Bracket

45° Elbow

93° Elbow

1 metre Extension

1 metre supplied in kit

Additional Accessories

A - 93° Elbow 5121373

B - 45° Elbow (Pair) 5121374

C - 1 metre 70Ø Extension 5121372

9.2 Determining Permissible Lengths - P.D.K.

In the graph the solid line diagonal represents the

relationship between the concentric flue assembly (and any

extensions) and the 70Ø exhaust (and any extensions or

additional bends).

Example 1 - Not Permissible

If, for instance, a concentric length of 3.25 metres was

required and the 70Ø exhaust needed to be 10 metres the

graph shows that this combination would NOT be

permissible as the intersection point would be above the

solid diagonal line.

Example 2 - Flue Lengths OK

Where both lengths have been determined they can be

applied to the graph to check that the installation is

permissible. For example, if it was known that 2 metres of

concentric flue and 4 metres of 70Ø exhaust were required,

the values could be applied to the graph as shown in

Example 2.. As the point of intersection of the dotted lines is

below the solid diagonal line, the combination of lengths is

shown to be acceptable.

Example 3 - Flue Lengths OK

In the example shown, assume that the concentric part of

the flue needs to be 2 metres long. Find the position of ‘2’ on

the horizontal axis of the graph and then project upwards to

the solid diagonal line. This is represented by the vertical

thick dotted line. Where this dotted line intersects with the

solid diagonal line on the graph, project across to the vertical

axis. As can be seen this corresponds with 14 metres.

Therefore, the total equivalent length of the 70Ø exhaust

can be up to 14 metres. Any elbow equivalencies must be

accounted for i.e. 93° elbows are equal to 1 metre, each 45°

elbow to 0.5 metres.

Example 1

Flue Lengths - Not Permissible

Example 2

Flue Lengths - OK

Example 3

Flue Lengths - OK

Concentric 70/110 Flue

(MUST be installed

horizontally)

70Ø Exhaust

Fig. D

9.0 Plume Displacement

28 © Baxi Heating UK Ltd 2014

9.3 General Fitting Notes - P.D.K.

1. Cut a hole in the external wall which the horizontal

concentric flue assembly will pass through.

2. When completed the terminal must be at least 2 metres

above ground level (Fig. E).

3. Measure and cut to size the concentric assembly and any

extensions that are being used.

4. Insert the concentric assembly through the hole from

outside the building and mark the position of the flue trim

securing holes.

5. Drill and plug the wall to accept the flue trim securing

screws, and re-insert the concentric assembly through the

wall.

6. Connect any extensions that are being used to the

concentric assembly. Engage the extension or concentric

assembly in the boiler flue elbow.

7. Fit the boiler flue elbow to the boiler top panel, ensuring

the gasket is in place (Fig. F).

Ensure that the concentric assembly is horizontal and that

the external air inlet is to the bottom. Any extensions

should fall back to the boiler.

8. Use suitable brackets to support the concentric assembly

and any extensions, and make good inside and outside.

Secure the flue trim to the wall.

9. The 70Ø exhaust can now be fitted to the spigot at the

terminal end.

10. If it is necessary to shorten the 70Ø exhaust or any of

the extensions, the excess material must be cut from the

plain end of the pipe.

11. Determine the position of the 70Ø exhaust and mark

on the wall a suitable position for the support bracket. Drill

and plug the wall. If extensions are being used, a support

bracket is supplied in each kit.

12. Engage the M6 threaded part of the mounting bolt in

the boss on the support bracket. Using the bracket for

leverage, screw the mounting bolt into the plugged hole

until the bracket is secure and level (Fig. G).

13. Slacken the two screws securing the retaining strap to

the bracket, and pivot the strap aside to allow fitting the

70Ø exhaust.

14. Complete the installation of the 70Ø exhaust, securing

in the brackets. Fit the 93° elbow and plume outlet. Ensure

the plume outlet is at least 45° to the wall and that the

‘peak’ is uppermost.

15. Continue with installation and commissioning of the

boiler.

Min. 2 metres

This section of the

flue MUST be

horizontal

Min. 0.3 metres

Fig. E

Fig. F

Fig. G

9.0 Plume Displacement

500mm Min.

Plume Outlet

Elbow

200mm Min.

9.3 General Fitting Notes - P.D.K. (cont.)

16. For aesthetic purposes it is permissible to route the

70Ø exhaust in an enclosed box, but the air inlet and

plume outlet MUST remain in free air.

17. It is also possible to separate the plume outlet from

the 93° elbow to allow the flue to be installed as shown

in Fig. H.

18. When the plume outlet is positioned under a balcony

or other projection (Figs. I & J) it must protrude at least

200mm (it is not necessary to extend it further than this).

200mm Min.

Fig. H

Fig. I

Fig. J

10.0 Installation

30 © Baxi Heating UK Ltd 2014

Check Site Requirements (section 7) before

commencing.

10.1 Initial Preparation

The gas supply, gas type and pressure must be

checked for suitability before connection (see Section

7.4).

1. Cut the banding and remove the fixing template, wall

plate and literature pack (Fig. 19a) from the carton.

2. After considering the site requirements (see Section

7.0) position the template on the wall ensuring it is level

both horizontally and vertically.

NOTE: When fitting Plume Displacement Kit refer

to the instructions supplied for details of

installation of the flue.

3. Mark the position of the centre hole for the wall

plate (Fig. 20).

4. Mark the centre of the flue hole (rear exit).

For side exit: project the horizontal side flue centre line

into the corner of the room and along the wall to

where the flue hole will be drilled. (Fig. 20).

The diagram (Fig. 21) shows the dimensions required to

ensure any horizontal flue is installed with the correct

fall to the boiler. Mark the offset (V) dimension and if

required, mark the position of the gas and water pipes.

Remove the template.

5. Cut the hole for the flue (minimum diameter

127mm, see table (Fig. 20) for wall thicknesses and flue

diameters).

6. Drill and plug the wall as previously marked. Secure

the wall plate using the centre hole (Fig. 22).

7. Ensuring the wall plate is level both horizontally and

vertically, drill and plug at least 4 securing positions at

the top and bottom through the wall plate. Utilising the

slots available ensure the wall plate is square and secure

to the wall (Fig. 22).

8. Loosely route the condensate discharge pipe to the

lower left hand side of the wall plate.

Wall Thickness

up to 227mm

up to 750mm

up to 1200mm

Flue Hole ø

127mm core drill

150mm core drill

175mm core drill

Fig. 20

Fig. 21

Fig. 22

Horizontal

Side Flue

Centre Line

EXAMPLE: Boiler is 2 metres away

from corner of wall, flue duct hole is

55mm up from horizontal side flue

centre line. This will maintain the

approx 1.5° backfall to the boiler.

Wall Plate Template

Edge of Boiler

0.5

1.0

2.0

3.0

4.0

Distance in metres from boiler to the wall.

For pipe lengths greater than 4m increase the off-set by 26mm

for every additional metre to maintain approx 1.5° inclination.

Flue Duct Hole

Offset V (mm) 13.527.555 82.5110

(metres)

(mm)

1.5°

Backfall to the Boiler, ie. 2m flue offset (V) position 55mm

Example

V = 55mm

96mm

Centre

Hole

Fig. 19a

Wall Plate

Template Literature Pack

Wall Plate

Relief Holes

10.0 Installation

10.2 Preparing The Boiler (Figs. 22a & 23)

1. Remove the outer carton and packaging.

2. Lift the outercase upwards and remove.

3. Remove the internal packaging.

Lower Door Panel

Outercase

Fig. 23

Break Off Upper &

Lower Pipe Run

Options

Fig. 22a

10.0 Installation

32 © Baxi Heating UK Ltd 2014

Return Pipe Connection

Flow Pipe

Connection

Suggested Lifting

Points shown as

shaded area

Wall Plate

Retaining Bracket

Fig. 25

Fig. 24

Flue Products Exhaust

Fig. 25a

Remove the red pipe

protection caps

10.3 Fitting The Boiler (Fig. 24)

1. Take the retaining bracket and two M6 nuts from the

fittings pack.

2. Offer up the boiler to the wall plate using the lifting

points shown in Fig. 24 and locate the rear bottom edge

onto the self locating support at the base of the wall plate.

(See Safe Manual Handling page 5.)

NOTE: When installing in a Loft/Small Compartment,

access for lifting the boiler from the front can be

gained for two people using the lifting points. (Fig. 24).

3. Rotate the boiler up to wall plate and engage retaining

bracket, securing with the two nuts.

4. Ensure the boiler is secured with the retaining

bracket.

5. Remove red pipe protection caps from the FLOW and

RETURN connections.

10.4 Making the Water Connections

(Fig. 25)

1. The boiler has two side water connections which are

labelled FLOW and RETURN. The front connection is the

flow pipe and the rear threaded connection is the return.

2. It is essential that the flow and return pipes are

connected to the boiler correctly. The flow connection

incorporates the boiler thermostats and a flow switch.

3. The boiler connections will accept 22mm fittings.

NOTE: On 30 models 28mm pipe should be used to

connect to the boiler flow and return using suitable

reducing fittings.

4. If the installation requires that the system pipework

originates from the bottom of the boiler, then the flow

and return pipes will need cutting, as they terminate

upwards.

10.5 Making the Condensate Drain Connection

1. Connect the condensate drain using the 1”BSP nut and

seal supplied. (see section 7.6).

NOTE: To ensure the correct operation and

integrity of the condensate drainage system -

Carefully pour approximately 1 cupful (250ml) of

water into the flue products exhaust, at the top of the

heat exchanger (Fig. 25a) to ensure a seal is made in

the trap.

10.0 Installation

10.6 Making the Gas Connection

1. Connect the gas supply to the G1/2(1/2in BSPT

Internal) gas tap. This is located on the lower right side

of the boiler, access by hinging down the PCB housing

(see Fig. 32).

10.7 Fitting The Flue

Before fitting the flue, check the condensate drain

integrity (see section 10.5).

IMPORTANT: The flue should always be installed

with a 1.5° fall from terminal to elbow, to allow

condensate to run back to the boiler.

HORIZONTAL FLUE

1. The standard flue is suitable for lengths 270mm

minimum to 800mm maximum (measured from the

edge of the flue elbow outlet).

Rear Flue: maximum wall thickness - 630mm

Side Flue: maximum wall thickness - 565mm (left or right)

2. For rear exit - measure the wall thickness

(Fig. 26) and to this dimension add 181mm. This

dimension to be known as (X).

i.e.

(X) = wall thickness + 181

3. Take the flue and mark off (X) from the terminal end

as indicated in the diagram

(Fig. 27).

Check your dimensions.

The flue tubes are fixed together. Cut through both

tubes whilst resting the flue on the semi-circular packing

pieces. Deburr both tube ends.

4. For side exit - measure the distance from the edge

of the wall plate to the inner face of the wall (Fig. 26)

and to this dimension add the wall thickness + 250mm.

This dimension to be known as (Z).

i.e.

(Z) = wall plate to wall + wall thickness + 250

5. Take the flue and mark off (Z) from the terminal end

as indicated (Fig. 27).

Check your dimensions.

The flue tubes are fixed together. Cut through both

tubes whilst resting the flue on the semi-circular packing

pieces. Deburr both tube ends.

IMPORTANT: Check all measurements before

cutting.

NOTE: When cutting ensure the cut does not

interfere with the inner flue support bracket

(Fig. 27a).

360° Orientation

Inner Flue Support Bracket

Wall Thickness

(Z) Edge of Wall Plate to Wall

Wall Thickness

(Z) = Side Exit

(X) = Rear Exit

Flue

Waste

Fig. 26

Fig. 27

Fig. 27a

At least

1.5°

10.0 Installation

34 © Baxi Heating UK Ltd 2014

10.7 Fitting the Flue (Cont)

6. Ensure the inner flue support bracket is positioned in

the flue (Fig. 28).

7. Engage the flue into the flue elbow using soap solution

to ease the engagement ensuring the flue is assembled as

shown (Fig. 29). Rear flue only: Take the tape supplied

in the kit and wrap around the joint between the flue

and the elbow (Fig. 29a).

8. Place the gasket over the flue exit on the boiler.

9. Slide the flue assembly through the hole in the wall.

10. Engage the elbow on to the flue connection on top

of the boiler. Secure with the four screws supplied in the

kit.

11. Make good between the wall and air duct outside the

building ensuring the 1.5° drop between the terminal and

elbow.

12. The flue trim should be fitted once the installation is

complete and the flue secure (Fig. 30). Apply a suitable

mastic to the inside of the trim and press against the wall

finish, making sure the brickwork is dust free and dry.

13. If necessary fit a terminal guard (see Section 8.8).

VERTICAL FLUEING

1. Only a flue approved with the Baxi Solo HE Arange

can be used.

Gasket

Flue Trim

Inner Flue Support Bracket

Flue

Flue Elbow

Fig. 28

Fig. 30

Fig. 29

Apply Lubricant for ease of

assembly. Ensure Flue is fully

engaged into Flue Elbow

Tape (Rear Flue Only)

Fig. 29a

10.0 Installation

10.8 Making The Electrical Connections

WARNING: This appliance must be earthed

1. The electrical connections are on the right hand side of

the unit.

2. The Baxi Solo 30 HE Ais factory set to give a maximum

output of 22.0 kW. The Control PCB jumper positions are

as follows:

CN11 (Blue) CN12 (Red)

If the installation requires a greater output to achieve the

desired room temperature, this can be increased to

30.18 kW and the boiler can be adjusted as follows (Fig. 32):

a) Remove the top right hand securing screw and

hinge down the PCB housing.

b) Remove the Red jumper labelled CN12 from the

bottom left hand side of the PCB.

c) Hinge back up the PCB housing and secure with

screw.

4. Route the incoming electrical cable/s through the

grommet in the support bracket. This will prevent damage

to the cable.

5. Lay the cable through the cable clamp to gauge the length

of cable required when it is connected to the 4-way

terminal block.

6. Connect the (S/L), (N) and ( ) wires to the

4-way terminal block (Fig. 33) and refit the cable clamp

(Fig. 31).

7. Check the electrical installation for;

earth continuity, short circuits, resistance to earth, correct

polarity and fuse failure.

Fig. 33

S/L N

Fig. 31

Cable Clamp

4-way Terminal Block

Blue (CN11) Jumper

Red (CN12) Jumper Fig. 32

Hinge down

PCB Housing

P/F Optional Pump Feed Connection

only required for fully TRV’d system

11.0 Electrical

36 © Baxi Heating UK Ltd 2014

11.1 Schematic Wiring Diagram

Key To Wiring Colours

b - Blue

bk - Black

w - White

br - Brown

gy - Grey

r- Red

g - Green

g/y- Green/Yellow

op - Opaque

y - Yellow

Gas

Valve

Spark

Electrode

g/y

Flame

Detection

Electrode

Condensate

Trap

Flow

Overheat

Thermostat

Fan

Overheat

Thermostat

g/y

Flow

Thermistor

325 Vdc

DC Fan

Flow

Switch

wgbr

PCB

Earths not shown to aid

clarity of diagram

g/y

LN Optional

Pump

Feed

g/y br

11.0 Electrical

Wiring Key

b- Blue

bk - Black

br - Brown

r- Red

w - White

g/y - Green/Yellow

g - Green

gy - Grey

op - Opaque

y - Yellow

11.2 Illustrated Wiring Diagram

Gas Valve

Fan

Condensate Trap

Flow Switch

Flow

Thermistor

Spark

Electrode

Flame

Detection

Electrode

Main

PCB

br g

Flow Overheat

Thermostat

Fan Overheat

Thermostat

rbk

g/y

Layout of PCB Pins

Optional

Pump

Feed

g/y

bbr

12.0 Commissioning the Boiler

38 © Baxi Heating UK Ltd 2014

12.1 Commissioning the Boiler

WARNING: The PCB Control and Fan

Assembly are 325 Vdc. Isolate at supply

before access.

1. Reference should be made to BS:EN 12828 & 14336

when commissioning the boiler.

2. At the time of commissioning, complete all relevant

sections of the Benchmark Checklist at the rear of this

publications.

3. Flush the whole system using a suitable flushing agent

(see Section 6.2) and vent the radiators. Check for water

leaks.

4. Refill the system with inhibitor following the inhibitor

manufacturer’s instructions and BS 7593 Code of Practice

for Treatment of Water in Domestic Hot Water Central

Heating Systems (see Section 6.2).

5. Complete the label supplied with the inhibitor and

attach to the inside of the boiler case. Detail of system

treatment should be added for future reference.

6. Turn the gas supply on and purge according to in GB

BS 6891 and in IE I.S. 813 “Domestic Gas Installations”.

7. Remove the top RH securing screw and hinge down

the PCB housing to gain access to the gas service cock

(see Fig. 32). Turn the gas service cock anticlockwise to

the ON position and check for gas tightness up to the gas

valve (Fig. 34).

NOTE: The 12,15,18,24 are self-regulating

dependent upon the system load. The 30 HE Awill

modulate between inputs of 33.76kW and 10.3kW.

The 30 HE Ainput is factory set at 24.5kW and can

be altered to 33.76kW - see section 10.8. No

adjustment of the gas valve is permissible.

IMPORTANT: The combustion for this appliance has

been checked, adjusted and preset at the factory for

operation on the gas type specified on the appliance

data plate. No measurement of the combustion is

necessary. Do not adjust the air/gas ratio valve.

8. Having checked:

•That the boiler has been installed in accordance with

these instructions.

•The integrity of the flue system and the flue seals.

•The integrity of the boiler combustion circuit and the

relevant seals.

Proceed to put the boiler into operation as follows:

Low

High

Reset

INOUT

Gas Service

Cock

Control Knob

Fig. 34

Fig. 35

Fig. 36

Open

Inlet Gas Pressure Test Point

DO NOT check gas pressure here

12.0 Commissioning the Boiler

Set Boiler to Maximum Rate*

Allow the combustion to

stabilise. Do not insert probe

to avoid ‘flooding’ the analyser.

Perform Flue Integrity

Visual Check

Examine all flue joints for

soundness and ensure the

system is adequately

supported.

Is flue system OK ?

Rectify all faults

If necessary call

0844 871 1555 for advice.

The appliance MUST NOT be

commissioned until all

problems are resolved.

Check CO & Combustion

Ratio at Maximum Rate

Whilst the boiler is still

operating at maximum insert

the analyser probe into the

flue gas test point, allowing the

reading to stabilise.

Is CO < 350ppm

and CO/CO2

ratio < 0.004 ?

Verify Integrity of Seals

Check all burner seals, internal

flue seals, door & case seals.

Replace any seals that appear

unsound.

Is CO < 350ppm

and CO/CO2

ratio < 0.004 ?

TURN APPLIANCE OFF !

Call 0844 871 1555 for advice.

The appliance MUST NOT be

commissioned until all

problems are identified and

resolved.

If commissioning cannot be

fully completed the appliance

must be disconnected from

the gas supply in accordance

with the GSIUR.

Note: Check & record the CO

& combustion ratio at both

maximum & a low rate before

calling 0844 871 1555.

Yes

No Yes

Yes

Is CO < 350ppm

and CO/CO2

ratio < 0.004 ?

Yes

BOILER OPERATING

SATISFACTORILY. NO

FURTHER ACTION

REQUIRED

Ensure test points are capped,

the boiler case front panel is

correctly fitted & secured and

all other commissioning

procedures completed.

Complete the ‘Benchmark’

Checklist, recording the

CO & combustion ratio

readings as required.

Set Boiler to operate at a low

rate. If it is not possible to adjust

the boiler to run at minimum rate

using the boiler controls, the

system must be set such that the

boiler will modulate to as low an

input as possible without the

burner extinguishing (e.g. by

closing radiator valves)

Allow the combustion to

stabilise. Do not insert probe to

avoid ‘flooding’ the analyser.

The gas rate must be checked &

recorded whilst the boiler is

operating in this condition.

*To operate at Maximum Rate

Ensure all external controls are

calling for heat, that the system

is cold and the boiler control

knob is turned fully clockwise.

12.2 Checking the Combustion

1. This procedure is mandatory in GB from April 2014. It is

strongly recommended to perform the procedure before that

date.

12.0 Commissioning the Boiler

40 © Baxi Heating UK Ltd 2014

12.3 Check the Operational (Working) Gas

Inlet Pressure

1. Ensure that all controls are calling for heat and

maximum load is applied to the system.

2. With the boiler operating in the maximum rate

condition check that the operational (working) gas

pressure at the inlet gas pressure test point is in

accordance with B.S. 6798 & B.S. 6891.

3. Ensure that this inlet pressure can be obtained with

all other gas appliances in the property working.

Measure the Gas Rate

4. With any other appliances & pilot lights turned OFF

the gas rate can be measured. It should be as shown in

Section 4.0 Technical Data.

5. Carefully read and complete all sections of the

Benchmark Commissioning Checklist at the rear of this

publication that are relevant to the boiler and

installation. These details will be required in the event of

any warranty work. The publication must be handed to

the user for safe keeping and each subsequent regular

service visit recorded.

6. For IE, it is necessary to complete a “Declaration of

Conformity” to indicate compliance with I.S. 813. An

example of this is given in I.S. 813 “Domestic Gas

Installations”. This is in addition to the Benchmark

Commissioning Checklist.

INOUT

Fig. 36a

Inlet Gas Pressure Test Point

DO NOT check gas pressure here

13.0 Fitting the Outer Case

13.1 Fitting The Outer Case

1. Position the outercase over the boiler engaging the

lugs in the side flanges over the hooks on the wall plate.

Break off top or bottom panel as required to

accommodate pipework runs (Fig. 37).

2. Using the two screws supplied in the kit, secure the

outercase to the combustion box (Fig. 37).

3. Hinge up the lower door panel (Fig. 38).

4. The “Important Ventilation Information” label can be

removed unless the appliance is installed in an

unventilated compartment.

5. Carefully read and complete all sections of the

Benchmark Commissioning Checklist at the rear of this

publication that are relevant to the appliance and

installation. These details may be required in the event

of any warranty work. The publication must be handed

to the user for safe keeping and each subsequent

regular service visit recorded.

For IE, it is necessary to complete a “Declaration of

Conformity” to indicate compliance to I.S. 813. An

example of this is given in I.S. 813 “Domestic Gas

Installations”. This is in addition to the Benchmark

Commissioning Checklist.

6. Instruct the user in the operation of the boiler

controls. Hand over the User’s Operating, Installation

and Servicing Instructions, giving advice on the necessity

of regular servicing.

7. Demonstrate to the user the action required if a gas

leak occurs or is suspected. Show them how to turn off

the gas supply at the meter control, and advise them

not to operate electric light or power switched, and to

ventilate the property.

8. Show the user the location of the system control

isolation switch, and demonstrate its operation.

9. Advise the user that they may observe a plume of

vapour from the flue terminal, and that it is part of the

normal operation of the boiler.

10. Complete the label supplied with the inhibitor and

stick to the inside of the boiler case. Detail of system

treatment must be recorded in the Benchmark

Commissioning Checklist.

Outercase Securing

Screws

Lower Door Panel

Fig. 37

Fig. 38

Break Off Panel

14.0 Servicing the Boiler

14.1 Annual Servicing

1. For reasons of safety and economy, it is recommended that

the boiler is serviced annually. Servicing must be performed by a

competent person in accordance with B.S. 7967-4.

2. After servicing, complete the relevant Service Interval Record

section of the Benchmark Commissioning Checklist at the rear of

this publication.

IMPORTANT: During routine servicing, and after any

maintenance or change of part of the combustion circuit, the

following must be checked:-

• The integrity of the complete flue system and the flue seals.

• The integrity of the boiler combustion circuit and relevant

seals as described in Section 14.2.

• The operational gas inlet pressure as described in Section

12.3.1 to 12.3.3 and the gas rate as described in 12.3.4.

• The combustion performance as described in ‘Check the

Combustion Performance’ (14.1.4 to 14.1.6 below).

3. Competence to carry out Checking Combustion

Performance

B.S. 6798 ‘Specification for Installation & Maintenance of Gas

Fired Boilers not exceeding 70kW’ advises that:-

• The person carrying out a combustion measurement should

have been assessed as competent in the use of a flue gas

analyser and the interpretation of the results.

• The flue gas analyser used should be one meeting the

requirements of BS7927 or BS-EN50379-3 and be calibrated

in accordance with the analyser manufacturers’ requirements.

• Competence can be demonstrated by satisfactory

completion of the CPA1 ACS assessment, which covers the

use of electronic portable combustion gas analysers in

accordance with BS 7967, Parts 1 to 4.

Check the Combustion Performance (CO/CO2 ratio)

4. Set the boiler to operate at maximum rate as described in

Section 12.2.

5. Remove the cap from the flue sampling point, insert the

analyser probe and obtain the CO/CO2 ratio. This must be

less than 0.004.

6. If the combustion reading (CO/CO2 ratio) is greater than

this, and the integrity of the complete flue system and

combustion circuit seals has been verified, and the inlet gas

pressure and gas rate are satisfactory either:

• Perform the ‘Annual Servicing - Inspection’ (Section 14.2) &

re-check.

• Replace the gas valve (Section 15.8) & re-check.

14.0 Servicing the Boiler

14.2 Annual Servicing - Inspection

1. Ensure that the boiler is cool.

2. The boiler cannot be switched off at the boiler, therefore it

is important to isolate the electrical supply at the mains fuse.

3. Hazardous materials are not used in the construction of

these products, however reasonable care during service is

recommended.

4. When replacing the combustion box door after servicing it is

essential that the retaining screws are tightened fully.

5. Ensure that both the gas and electrical supplies to the

boiler are isolated.

6. Remove the outercase and lower door panel (see Fitting the

Outercase, Section 13.0).

WARNING: The PCB Control and Fan

Assembly are 325 Vdc. Isolate at supply

before access.

7. Release the four 1/4turn screws securing the air box door

panel and remove the door (Fig. 39).

8. Disconnect the leads from the centre and right hand

terminals (earth and flame sensing probe) (Fig. 40). Reconnect

in reverse order.

9. Undo the four screws securing the combustion box door

and remove the door (Fig. 41).

10. Visually check for debris/damage and clean or replace if

necessary the following:

a) Burner.

b) Heat exchanger fins.

c) Fan compartment (Check also for condensate leaks).

d) Insulation.

e) Door seals-Important: Pay particular attention to

the condition of the combustion box door seals.

f) Electrodes.

g) The condensate trap

NOTE: Remove the trap drain plug and place a vessel

underneath to catch the condensate (care should be

taken as this could be hot). Clean the trap and refit

the drain plug. Check for leaks.

h) Top of heat exchanger.

Air Box Door Panel Lead Terminals

Combustion Box

Door Panel

Fig. 39

Fig. 41

Fig. 40

Sensing

Earth

Spark

Sleeve

14.0 Servicing the Boiler

14.2 Annual Servicing - Inspection (Cont)

10. To clean the heat exchanger and burner proceed as

follows:

a) Disconnect the electrical leads to the fan component

protection sensor (Fig. 42).

b) Loosen the screw retaining the gas injector pipe at

the venturi (Fig. 42).

c) Undo the two wing nuts to disconnect the fan

(Fig. 42).

d) Remove the fan and disconnect the electrical supply

to it (Fig. 42).

e) Remove the gas injector pipe from the gas valve

(push-fit) (Fig. 42).

f) Undo the condensate trap securing nut, lock nut and

the condensate drain pipe. Remove the condensate trap

and disconnect the sensor leads (Fig. 43).

g) Remove the two screws securing the burner and

remove the burner. Visually inspect the internal burner

baffle for obstruction, check seal around baffle for

cracks/damage. Clean with a soft brush.

h) Loosen the two screws retaining the heat exchanger

support bracket and slide to the left to remove

(Fig. 44).

i) Remove the four screws securing the heat

exchanger/combustion box base and withdraw the

base.

j) Lower the central insulation panel and check

condition (Fig. 44). Replace the lower insulation pad if

necessary.

k) Ensure the heat exchanger fins are clear of any

obstruction.

l) Check condition of all seals. Important: Pay particular

attention to the condition of the combustion box

door seals.

m) Reassemble in reverse order and check for leaks.

11. Check CO/CO2ratio and CO2level at flue sampling

point (Fig.41a) is as quoted in Section 4.0 ‘Technical

Data’.

12. If the ratio or level is greater than that quoted,

telephone the Technical Enquires for further advice.

IMPORTANT: No adjustment of the gas valve is

permissible.

13. Complete the relevant Service Interval Record

section of the Benchmark Commissioning Checklist at

the rear of this publication and then hand it back to the

user.

Combustion Box Base

Securing Screws

Burner Securing

Screws

Combustion

Box Base

Burner

Wing Nuts

Electrical Supply

Lock Nut

Condensate

Trap

Condensate

Drain Pipe

Securing Nut

Central Insulation Panel

Heat Exchanger

Support Bracket

Injector Pipe

Injector Pipe Retaining

Screw

Protection

Sensor Leads

Fan

Fig. 42

Fig. 44

Fig. 43

Sensor

Leads

Flue Sampling Point

Fig. 41a

Service Drain

Plug

15.0 Changing Components

15.1 Changing Components

IMPORTANT: When changing components ensure

that both the gas and electrical supplies to the boiler

are isolated before any work is started.

“The boiler cannot be switched off at the boiler,

therefore it is important to isolate the electrical

supply at the mains fuse.”

Hazardous materials are not used in the construction

of these products, however reasonable care during

service is recommended.

When replacing the combustion box door after

changing components, it is essential that the retaining

screws are tightened fully.

After Changing Components a combustion check

should be performed (see Section 15.8.11). This is

especially important on gas carrying parts, and those

that may affect combustion (e.g. fan).

1. Before changing any components please read Section

1.2 Important Information.

2. Remove the outer case and lower door panel (see

“Fitting the Outercase” Section 13.0).

WARNING: The PCB Control and Fan

Assembly are 325 Vdc. Isolate at supply

before access.

3. Isolate the water circuit and drain the system as

necessary. A drain point is located on the heat

exchanger manifold at the right hand side of the boiler

(Fig. 45) to enable the heat exchanger to be drained.

4. Place a tube on the drain point to drain water away

from electrics. Turn anticlockwise to open (Fig. 45).

NOTE: When reassembling always fit new ‘O’ rings,

ensuring their correct location on the spigot. Green

“O” rings are used for gas joints and Black “O” rings

for water joints. Use Greasil 4000 (Approved

Silicone Grease).

5. After changing a component re-commission the

boiler where appropriate and check the inhibitor

concentration (see Section 6.2 and 12.1).

The thermistor, safety thermostat, interface PCB and

the flow switch can be accessed after removal of the

outer case.

15.2 Flow Temperature Thermistor and

Safety Thermostat (Fig. 46)

1. The procedure is the same for both the thermistor

and the safety thermostat.

2. Remove the electrical connections from the sensor.

3. Unscrew the sensor from the pipe.

4. Fit the new thermistor or safety thermostat and

reassemble in reverse order.

Drain Point

Heat Exchanger

Manifold

Tube

Electrical Connections

Flow Temperature Thermistor

Safety

Thermostat

Fig. 45

Fig. 46

15.0 Changing Components

15.3 Flowswitch (Fig. 47)

1. Drain the boiler (see Section 15.1 paragraph 2 & 3).

2. Remove the two screws on the support bracket.

3. Remove the clip securing the flow pipe to the

flowswitch.

4. Disconnect the inline electrical connection.

5. Pull pipe away from flowswitch.

6. Remove the two screws securing the flowswitch to

the boiler.

7. Remove the flowswitch.

8. Fit the new flowswitch and reassemble in reverse

order.

9. Recommission the boiler and check the inhibitor

concentration (see Section 6.2 and 12.1).

Flow Switch

Clip

Flow Pipe

Fig. 47

Support Bracket

15.4 PCB (Figs. 48 & 49)

WARNING: The PCB Control and Fan

Assembly are 325 Vdc. Isolate at supply

before access.

1. Pull the control knob off the spindle and remove the

plastic button cover. Refit them onto the new PCB

(Fig. 48).

2. Remove the top right hand securing screw and hinge

down the PCB housing and disconnect the electrical

connections noting their positions

NOTE: Check the PCB for the presence of input

jumpers - see section 10.8. Set the new PCB as the

one removed.

3. Lift Control PCB housing out of hinge housing of

metal bracket.

4. Fit the new PCB Housing Assembly and reassemble

in reverse order.

PCB Housing Securing

Screw

Control

Knob

Fig. 48

Blue (CN11) Jumper

Red (CN12) Jumper Fig. 49

Hinge down

PCB Housing

Plastic

Button

Cover

15.0 Changing Components

The fan and venturi, gas valve, injector pipe,

condensate trap, fan protection sensor, spark and

sensing electrodes can be accessed and changed on

the removal of the airbox door panel.

1. Remove the airbox door panel by loosening the four

1/4turn screws (Fig. 50).

15.5 Spark and Sensing Electrodes

(Fig. 51)

1. Disconnect all three leads from tabs.

Spark - Opaque cable

Earth - Green/Yellow cable

Sensing - White cable

2. Remove the two screws securing each of the

electrodes to the combustion box door and remove the

electrodes.

3. Fit the new electrodes (and new gasket, as required)

and reassemble in reverse order.

15.6 Fan (Fig. 52)

WARNING: The PCB Control and Fan

Assembly are 325 Vdc. Isolate at supply

before access.

1. Loosen the screw holding the injector pipe into the

venturi.

2. Remove the electrical connections to the fan and

protection sensor on the fan.

3. Remove the wing nuts securing the fan to the base of

the combustion box.

4. Lower the fan and remove.

5. If changing the fan remove the screws securing the

venturi and fan protection sensor bracket, noting the

positions of the injector opening and sensor bracket, fix

them to the new fan.

6. Fit the new fan and reassemble in reverse order.

The injector pipe, condensate trap and gas valve can

be changed after the removal of

the fan.

Wing Nuts

Injector Pipe

Screw

Electrical Connections

Electrical Connection

Protection

Sensor

Injector

Opening

Gasket

Venturi

Fan

Air Box Door Panel

Sensing

Earth

Spark Combustion

Box Door

Fig. 50

Fig. 51

Fig. 52

15.0 Changing Components

The removal of the fan is necessary to enable the changing

of the injector pipe, condensate trap and gas valve (see

section 15.6).

15.7 Injector Pipe (Fig. 53)

1. Remove the injector pipe by pulling out from the ‘O’ ring

joint in the gas valve.

2. Fit the new injector pipe and reassemble in reverse order.

15.8 Gas Valve (Fig. 53)

IMPORTANT: After replacing the valve the CO2must

be checked as detailed in Section 14.1.4 to 14.1.6. Only

change the valve if a suitable calibrated combustion

analyser is available, operated by a competent person -

see Section 14.1.3.

1. Remove the Control PCB (see Section 15.4).

2. Isolate gas supply and disconnect the gas tap by removing

the four screws.

3. Undo the case pressure pipe from the gas valve.

4. Disconnect the electrical plug from the gas valve.

5. Remove the fan (see section 15.6) and injector pipe.

6. Remove the two gas valve securing screws from inside the

air box holding the gas valve.

7. Remove the gas valve from the airbox side.

8. Remove the aluminium spacer and its gasket from the gas

valve.

9. Fit the aluminium spacer and its gasket to the new valve.

10. Fit the new gas valve and reassemble in reverse order.

NOTE: Check for gas tightness after replacing gas valve.

11. Check the CO2 level. If the level is greater than that

quoted, telephone the Technical Enquiries for further advice.

IMPORTANT: No adjustment of the gas

valve is permissible.

15.9 Condensate Trap (Fig. 54)

1. Disconnect the condensate trap from the base of the heat

exchanger.

2. Disconnect the condensate drain (outside the boiler) from

the condensate trap.

3. Undo the condensate trap lock nut and remove the trap

from the boiler. Disconnect the sensor leads.

4. Fit the new condensate trap and reassemble in reverse

order.

5. Prime the condensate trap (fill first chamber), check for

leaks.

Injector Pipe

Gas Tap

Case Pressure Pipe

Boiler Side

Gas Valve

Securing Screws

Lock Nut

Condensate

Drain Pipe

Condensate

Trap

Securing

Nut

Sensor

Leads

Fig. 53

Fig. 54

Aluminium

Spacer

‘O ring’

Gasket

Electrical Plug

Service Drain

Plug

15.0 Changing Components

The burner and heat exchanger can be changed after

removal of the combustion box door. To change the

heat exchanger, the fan and burner must be removed

first (see section 15.6 and 15.10).

1. Remove the combustion box door by removing the

four securing screws (Fig. 55).

IMPORTANT: On refitting the combustion box

door check the condition of the combustion box

door seals.

15.10 Burner (Fig. 56)

1. Remove the two screws securing the burner to the

base of the combustion box.

2. Remove the burner carefully from the combustion

box base.

3. Check the burner seal on the heat exchanger base,

replace if necessary. Fit the new burner and reassemble

in reverse order.

15.11 Heat Exchanger

1. Drain the boiler (see section 15.1 paragraph 2 & 3).

2. Remove all components in the base of the airbox.

3. Undo the screws on the support bracket. Remove

the screws securing the flow switch and return

connections and remove the connections (Fig. 57).

4. Remove the screws securing the heat exchanger

manifold and remove the manifold (Fig. 58).

5. Lift the heat exchanger assembly (Fig. 59) and rotate

the bottom upwards whilst pulling it forwards out of the

airbox.

6. Fit the new heat exchanger and reassemble in reverse

order.

7. Recommission the boiler and check the inhibitor

concentration (see Section 6.2 and 12.1).

Combustion Box

Door Panel

Burner

Securing Screws

Fig. 55

Fig. 56

Fig. 58

Fig. 59

Fig. 57

Heat Exchanger

Manifold

Return

Connection

Flow

Switch

Heat Exchanger

Assembly

Support

Bracket

15.0 Changing Components

Combustion

Box Base

Central Insulation Panel

Support Bracket

Burner

15.12 Heat Exchanger Lower Insulation Pad

(Fig. 60)

1. Remove all components in the base of the airbox.

2. Remove the burner (see section 15.10).

3. Remove the four bolts securing the combustion box

base.

4. Remove the combustion box base.

5. Pull the central insulation panel down from the

centre of the heat exchanger and remove the lower

insulation pad.

6. Fit the new insulation pad and reassemble in reverse

order.

15.13 Heat Exchanger Upper Insulation Pad

(Fig. 60)

1. Remove all components in the base of the airbox.

2. Remove the burner (see section 15.10).

3. Remove the heat exchanger (see section 15.11).

4. Remove the four bolts securing the combustion box

base.

5. Remove the combustion box base.

6. Pull the central insulation panel down from the

centre of the heat exchanger.

7. Fit the new insulation pad and reassemble in reverse

order.

Combustion Box Base

Securing Screws

Burner Securing

Screws

Fig. 60

Upper Insulation

Pad

Lower Insulation

Pad

16.0 Short Parts List

Short Parts List

Key G.C. Description Manufacturers

No. No. Part No.

A E06 058 Flow Temperature

Thermistor (Red) 240670

B E06 059 Flow Switch 242459

C E06 060 Safety Thermostat

(Black) 242235

D PCB 5129147

E Fan 5109925

F Gas Valve 241900

G E06 085 Viewing Window 242484

H Condensate Trap 5111714

I Electrodes Kit 5132097

J Burner Assy 5107430

K E06 097 Heat Exchanger Assy 242497

L Control Knob 5109996

ABC

17.0 Fault Finding

Low

High

Reset

Mains On

LED Light

(Green)

Boiler On

LED Light

(Green)

Lockout

LED Light

(Red)

Lights

Off Off Off

Live & Neutral Reversed

Incoming Live and Neutral

reversed.

Go to Ignition Lockout section

of the fault finding instructions.

Go to Fan Lockout

section of the fault finding

instructions.

Go to Thermistor section

of the fault finding

instructions.

Low Electrical Supply

Incoming Voltage less than

180V. Check System

Controls & System Wiring.

Otherwise contact Electricity

Provider.

LV Wiring Harness Ensure 8-

way PCB connector securely

pushed in. If fault persists

replace LV wiring harness.

PCB Fault

Replace PCB.

PCB Fault

Replace PCB.

PCB Fault

Replace PCB.

YES

Go to Electrical Supply

section of the fault finding

instructions.

Go to Dry-Fire

section of the fault finding

instructions.

Go to Overheat Lockout

section of the fault finding

instructions.

NOTE: The fan is supplied with 325 Vdc.

Fan Fault Finding should only be carried out after the

boiler has been electrically isolated.

General Fault Finding should only be carried out by

someone who is appropriately qualified.

Lights

On Off Flash

Lights

On Flash Flash

Lights

On Off On

Lights

Flash Off On

Lights

Flash Flash On

Lights

On Flash On

Lights

Flash Off Flash

Lights

On On On

Lights

Flash On Flash

Lights

On On Flash

Lights

Flash On On

17.0 Fault Finding

No Switched Live to

boiler. Check Systems

Controls and System

Wiring.

240V at B ? Check wiring from

terminal block to PCB.

Check for shorts on

pump, fan & gas valve.

Replace if shorted &

replace fuse.

YES

Replace PCB.

YES

ELECTRICAL SUPPLY

240V at A ?

PCB fuse OK ?

Fuse

Lights

Off Off Off

Optional

Pump

Live

17.0 Fault Finding

DRY-FIRE

Fill system with water and

bleed out all air.

Replace PCB.

YES

Is the

system full of water ?

Is the

pump running ?

Unplug

5-way PCB

connector. Is there continuity

between H (run pump from

switched live) ?

Disconnect

Flow Switch Inline

connector. With pump running is

there continuity across flow

switch ?

Remove Blockage.

YES

Turn

mains off & on. After 5 sec, is

there 240V

at E?

Pump or Pump Wiring

fault.

Is there a

blockage in the system ?

YES

Optional

Pump

Live

Turn

mains off, unplug

7-way connector to PCB.

Is there continuity between

F and G ?

Wiring from terminal

block to PCB faulty.

YES

Replace PCB.

Wires from inline

connector to PCB faulty.

Remove

flow switch from boiler.

Is there a physical blockage to

the paddle within the

flow switch ?

Replace Flow Switch.

Remove Blockage.

YES

Viewed from

Wire Entry end

7-way Connector

Lights

On Flash Flash

Optional

Pump

Live

Swop Flow & Return.

Are

Flow & Return reversed ?

YES

17.0 Fault Finding

IGNITION LOCKOUT

YES

there gas at gas valve inlet ? Check isolation valve and

gas supply.

YES

Reset Lockout.

Is there gas flow

(check at meter) ?

Remove

5-way connector

from gas valve. Is there 240

Vdc between I & J

during ignition ?

spark or flame detection

probe damaged ?

Replace PCB.

Rectify wiring.

Replace Gas Valve.

Clear blockage and dry

sensors.

Set spark gap to 3.5mm.

Clean burner or replace as

necessary.

YES

Remove Gas Valve & check

inlet filter for blockage.

Otherwise incorrect gas supply

to boiler.

there at least

18mbar dynamic at gas valve

inlet ?

Lead from PCB to Gas

Valve faulty.

spark gap between 3 and

4mm ?

Replace spark or flame

detection probe and

gaskets.

wiring from PCB

to spark probe & flame

detection probe OK ?

NO YES

YES

Remove

the larger or the

two 6-way PCB connectors.

Is there continuity from I to L

& from J to K ?

Condensate Trap

blocked or water on

terminals ?

Is the

burner blocked or

damaged ?

Replace PCB.

YES NO

YES

5-way Connector

6-way Connector

Lights

On Off On

17.0 Fault Finding

OVERHEAT LOCKOUT

Replace Stat.

Wiring from PCB to

thermostats faulty.

YES

Disconnect

black stat on flow pipe.

When flow < 60° C is there

continuity across stat ?

Replace combustion

chamber door seal & trim

seal.

YES

Reconnect stat.

Disconnect fan stat.

When fan temp < 60° C

is there continuity

across stat ?

Reconnect stat.

Disconnect the larger of

the 6-way PCB connectors.

Is there continuity

across M ?

Disconnect

thermistor

(red sensor on flow pipe).

Is resistance between

0.5kè & 20kè ?

combustion chamber

door seal damaged or not in

place ?

Replace PCB.

YES

Replace thermistor.

6-way Connector

Lights

Flash Off On

17.0 Fault Finding

FAN LOCKOUT

Rectify wiring.

YES

Unplug

3-way PCB connector

& unplug fan. Is there

continuity from N to O &

from P to Q ?

Unplug

the smaller of the

6-way PCB connector. Is there

continuity from R to S & from T

to U & from

V to W ?

Replace fan.

Rectify wiring.

YES

Viewed from

Wire Entry end

Fan

Connection

PCB

Connection

Fan

Connection

PCB

Connection

NOTE: The fan is supplied with 325 Vdc.

Fan Fault Finding should only be carried out after the

boiler has been electrically isolated.

Lights

Flash Flash On

THERMISTOR

Replace thermistor.

Wiring from PCB to

thermistor faulty.

YES

Replace PCB.

Unplug

thermistor,

Is thermistor resistance between

0.5kè & 20kè ?

Plug in

thermistor, leave

8-way connector unplugged.

Is resistance at D between

0.5kè & 20kè ?

Viewed from

Wire Entry end

Lights

On Flash On

*All installations in England and Wales must be to LocalAuthorityBuilding Control(LABC)either directly or through a

Competent Persons Scheme.ABuilding Regulations Compliance will then be issued to the customer.

www.centralheating.co.uk

This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating

compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.

Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the

warranty. This does not affect the customer’s statutory rights.

GAS BOILER SYSTEM COMMISSIONING CHECKLIST

Customer name:Telephone number:

Address:

Boiler make and model:

Boiler serial number:

Commissioned by (PRINT NAME): Gas Safe register number:

Company name:Telephone number:

Company address:

Commissioning date:

CONTROLS (tick the appropriate boxes)

Time and temperature control to heating Room thermostat and programmer/timer Programmable room thermostat

Load/weather compensation Optimum start control

Time and temperature control to hot water Cylinder thermostat and programmer/timer Combination Boiler

Heating zone valves Fitted Not required

Hot water zone valves Fitted Not required

Thermostatic radiator valves Fitted Not required

Automatic bypass to system Fitted Not required

Boiler interlock Provided

ALL SYSTEMS

’s instructions Yes

What system cleaner was used?

What inhibitor was used? Quantity litres

Yes No

CENTRAL HEATING MODE measure and record:

Gas rate m³/hr OR ft³/hr

Burner operating pressure (if applicable)mbar OR Gas inlet pressure mbar

°C

Central heating return temperature °C

COMBINATION BOILERS ONLY

Is the installation in a hard water area (above 200ppm)? Yes No

Yes No

DOMESTIC HOT WATER MODE Measure and Record:

Gas rate m³/hr OR ft³/hr

Burner operating pressure (at maximum rate)mbar OR Gas inlet pressure at maximum rate mbar

Cold water inlet temperature °C

Hot water has been checked at all outlets Yes Temperature °C

I/min

CONDENSING BOILERS ONLY

The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 Yes

ALL INSTALLATIONS

Record the following:At max. rate: CO ppm ANDCO/CO² Ratio

At min. rate: (where possible) CO ppm ANDCO/CO² Ratio

The heating and hot water system complies with the appropriate Building Regulations Yes

The boiler and associated products have been installed and commissioned in accordance with the manufacturer’s instructions Yes

The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes

The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes

Commissioning Engineer’s Signature

Customer’s Signature

www.centralheating.co.uk

It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.

Service Provider

Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions.

SERVICE RECORD

SERVICE 01Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 02Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 03Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 04Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 05 Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 06 Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 07Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 08 Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 09 Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

SERVICE 10Date:

Engineer name:

Company name:

Telephone No:

Gas safe register No:

Record:At max. rate:CO ppm ANDCO² %

At min. rate: (Where Possible)CO ppm ANDCO² %

Comments:

Signature

*All installations in England and Wales must be to LocalAuthorityBuilding Control(LABC)either directly or through a

Competent Persons Scheme.ABuilding Regulations Compliance will then be issued to the customer.

BAXI

A Trading Division of Baxi Heating UK Ltd (3879156)

Brooks House, Coventry Road, Warwick. CV34 4LL

After Sales Service 0844 871 1525 Technical Enquiries 0844 871 1555

Website www.baxi.co.uk

e&oe

All descriptions and illustrations provided in this leaflet have been carefully

prepared but we reserve the right to make changes and improvements in

our products which may affect the accuracy of the information contained in

this leaflet. All goods are sold subject to our standard Conditions of Sale

which are available on request.

Baxi Solo He A Quick Start Guide 7204218

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