Baxi Potterton Performa 24 Eco HE User Manual

You can rely on

Installation & Service Instructions							Performa
							24 Eco HE
							Condensing
							Combination Boiler

Reset	Burner On	1	2
	Flame Failure		3
	Power On	0	4
			bar

These instructions include the Benchmark Commissioning

Checklist and should be left with the user for safe keeping.

© Baxi Heating UK Ltd 2009

Natural Gas

Potterton Performa 24 Eco HE

G.C.No 47 393 11

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With the introduction of Self Certification Schemes, the Benchmark Logbook is being withdrawn.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

Potterton 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.

0086

Contents

Section			Page
		Legislation	4
1.0		Introduction	6
2.0		General Layout	7
3.0		Appliance Operation	8
4.0		Technical Data	9
5.0		Dimensions and Fixings	10
6.0		System Details	11
7.0		Site Requirements	14
8.0		Flue Options	18
9.0		Plume Displacement	23
10.0		Installation	27
11.0		Commissioning the Boiler	32
12.0		Completion	34
13.0		Servicing the Boiler	35
14.0		Changing Components	37
15.0		Illustrated Wiring Diagram	47
16.0		Fault Finding	48
17.0		Fault Indication Display	52
18.0		Short Parts List	53
		Benchmark Checklist	54

© Baxi Heating UK Ltd 2009 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, or stored in any retrieval system of any nature (including in any database), in each case whether electronic, mechanical, recording or otherwise, without the prior written permission of the copyright owner, except for permitted fair dealing under Copyrights, Designs and Patents Act 1988.

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

The Company Secretary, Baxi Heating UK Ltd, The Wyvern Business Park,

Stanier Way, Derby, DE21 6BF.

Full acknowledgement of author and source must be given.

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

“Potterton” supports

2 © Baxi Heating UK Ltd 2009	ISO 9001
	FM 00866

Installer Notification Guidelines

Choose Building

Regulations Notification

Route

Competent Person's

Self Certification Scheme

Install and Commission this appliance to manufacturer's instructions

Complete the

Benchmark Checklist

If you notify via the ‘Gas Safe Register’, the register will issue the Building Regulations certificate on members’ behalf

Scheme Members only

Call ‘Gas Safe Register’ on: 0800 408 5577

or log onto: www.GasSafeRegister.co.uk within 10 days

You must ensure that the certificate number issued by the ‘Gas Safe Register’ is written onto the Benchmark Checklist

‘Gas Safe Register’ will issue a Building Regulations Compliance Certificate to the property owner and inform the relevant LABC

Building Control

Contact your relevant Local Authority Building Control (LABC) who will arrange an inspection or contact a government approved inspector

Install and Commission this appliance to manufacturer's instructions

Complete the

Benchmark Checklist

LABC will record the data and will issue a certificate of compliance

© Baxi Heating UK Ltd 2009

3

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.

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

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.

The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency) Regulations 1993 No 3083” and is deemed to meet the requirements of Directive 92/42/EEC on the energy efficiency requirements for new hot water boilers fired with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by:

Notified Body 0051.

Product/Production certified by:

Notified Body 0086.

For GB/IE only.

Legislation

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

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

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

•Gas Safety (Installation & Use) Regulations.

•The appropriate Building Regulations either The Building Regulations, The Building Regulations (Scotland), Building Regulations (Northern Ireland).

•The Water Fittings Regulations or Water Byelaws in Scotland.

•The Current I.E.E. Wiring Regulations.

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 5449	Forced circulation hot water systems.
BS 6798	Installation of gas fired hot water boilers.
BS 5440 Part 1	Flues.
BS 5440 Part 2	Ventilation.
BS 7074	Expansion vessels and ancillary equipment
	for sealed water systems.
BS 7593	Treatment of water in domestic hot water
	central heating systems.
In IE the following Codes of Practice apply:
Standard	Scope
I.S. 813	Domestic Gas Installations.

The following BS standards give valuable additional information;

BS 5546	Installation of hot water supplies for
	domestic purposes.
BS 5449	Forced circulation hot water systems.
BS 7074	Expansion vessels and ancillary equipment
	for sealed water systems.
BS 7593	Treatment of water in domestic hot water
	central heating systems.

4© Baxi Heating UK Ltd 2009

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 TWOPEOPLE.

Do not handle or lift unless you feel physically able.

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

Preparation

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

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

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

Technique

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

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

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

Remember

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

If at any time when installing the boiler you feel that you may have injured yourself STOP !!

DONOT ‘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 !!

© Baxi Heating UK Ltd 2009

5

Case Front Panel

Control Box

Fig. 1

Data Badge

1.0Introduction

1.1Description

1.The Potterton Performa 24 Eco HE is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and mains fed domestic hot water.

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

25.2kW (condensing).

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

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

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

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

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

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

1.2Contents of Pack

The pack contains:-

Boiler

Wall Plate (inc. taps)

Set of Connections

Template

Literature Pack

6© Baxi Heating UK Ltd 2009

1

20

19

18

17

2

16

15

3

4 13

5

6

7

8

14

12 11

10

9

2.0General Layout

2.1Layout

1.Air Pressure Switch

2.Expansion Vessel

3.Burner Manifold

4.Automatic Air Vent

5.DHW Plate Heat Exchanger

6.Circulation Pump

7.Drain Off Point

8.Safety Pressure Relief Valve

9.Optional Integral Timer Position

10.Central Heating System Pressure Gauge

11.Control PCB

12.Control Box

13.3-Way Valve Assembly

14.Condensate Trap

15.Flame Sensing Electrode

16.Spark Electrode

17.Burner

18.Primary Heat Exchanger

19.Fan Assembly

20.Secondary Heat Exchanger

21.On/Off/Reset Selector Switch

22.Burner & Fault Indicator Neon

23.Power Neon

24.Flame Failure & Fault Indicator Neon

25.Central Heating Temperature Control

26.Hot Water Temperature Control

2

Reset

Burner On

Flame Failure	1	3
Power On	0	4
		bar

21

22

23

24

25

26

10

9

© Baxi Heating UK Ltd 2009

7

						1
	Central Heating Circuit
							27
						2
					3	4	7
		26
					5	6
	25					8
	24
	23					9
	22						11
	21		17			10
	20	18
	16		15	14		13	12
		19
	Fig. 2
Key
1	Primary Heat Exchanger			15	Domestic Hot Water Outlet
2	Burner			16	Heating Flow
3	Ignition Electrode			17	Pressure Gauge
4	Flame Sensing Electrode			18	Hydraulic Differential Pressure Sensor Microswitch
5	Gas Valve			19	Automatic By-Pass
6	Pump			20	Hydraulic Differential Pressure Sensor
7	Automatic Air Vent			21	Diverter Valve Assembly
8	Plate Heat Exchanger			22	Domestic Hot Water Flow Priority Assembly
9	Flow Sensor with Filter			23	Domestic Hot Water Flow Priority Microswitch
10	Pressure Relief Valve			24	Safety Thermostat
11	Boiler Drain Point			25	Central Heating Temperature Sensor
12	Heating Return			26	Expansion Vessel
13 Cold Water Inlet On/Off Valve and Filter				27	Secondary Heat Exchanger
14	Gas Inlet
						1
	Domestic Hot Water Circuit
							27
						2
					3	4	7
		26
					5	6

25

	24				8
23				9
22					11
21		17
					10
	20
16	18	15	14	13	12
	19

Fig. 3

3.0 Appliance Operation

NOTE: All delay timers mentioned in 3.1 and 3.2 are

overridden by domestic hot water demand.

3.1Central Heating Mode (Fig. 2)

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

2.The main burner ignites at low rate, then the gas valve controls the gas rate to maintain the heating temperature measured by the temperature sensor.

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

3.2Domestic Hot Water Mode (Fig. 3)

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

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

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

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

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

8© Baxi Heating UK Ltd 2009

Appliance Type	C12		C32	C52
Appliance Category			CAT II 2H 3P
Heat Input CH
	Max		Min
kW	24.8		10.6

Heat Output CH (Non-Condensing)

Max Min

kW 24 9.8

Heat Output CH (Condensing)

Max Min

kW 25.2 10.1

Heat Input DHW

Max

kW 24.8

Heat Output DHW

Max

kW

24

Max Gas Rate

(Natural Gas - G20)

(After 10 mins)

m3/h

2.62

Burner Pressure

(Natural Gas - G20)

Max Rate

Min Rate

mbar

10.2 ± 0.5

2 ± 0.2

Inlet Pressure (Natural Gas - G20)

mbar

20

Burner Injector (Natural Gas - G20)

15 x 1.18mm Diameter

Electrical Supply

230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption

170W

External Fuse Rating

3A

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

LPG Propane - G31

Burner Injector 15 x 0.77mm diameter

Burner Pressure		Max Rate		Min Rate
Propane	mbar	21.8	± 0.5	4.4 ± 0.2
Inlet Pressures
mbar		37

4.0 Technical Data

Electrical Protection								IPX4D
NOx Class								3
Condensate Drain								1” BSP
Flue Terminal						Diameter			100mm
Dimensions						Projection			125mm
Connections								copper tails
Gas Supply								-	22mm
Central Heating Flow								-	22mm
Central Heating Return								-	22mm
Cold Water Mains Inlet								-	15mm
DHW Flow								-	15mm
Pressure Relief Discharge								-	15mm
Outercase Dimensions
Casing Height								-	780mm
Overall Height Inc Flue
Elbow								-	965mm
Casing Width								-	450mm
Casing Depth								-	345mm
Clearances
Above Casing						200 mm Min
Below Casing						200 mm Min
Front						450 mm Min (For Servicing)
Front						5 mm Min (In Operation)
L.H. Side						5 mm Min
R.H. Side						5 mm Min (In Operation)
						20mm Min (See Note*)

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

Weights	kg
Packaged Boiler Carton	50
Installation Lift Weight	43.5

Central Heating Primary Circuit

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

DHW Circuit				bar
Pressures
Max Operating				8
Min Operating				0.2
Min Operating Pressure
at 11.1 l/min				0.9
Flow Rates				l/min
DHW Flow Rate
@ 30°CRise				11.5
DHW Flow Rate
@ 35°CRise				9.8
Min Working
DHW Flow Rate				2.5
Pump
Available Head			See graph below
Expansion Vessel			- (For Central Heating
only. Integral with appliance)
				bar
Min Pre-charge Pressure				0.5
				litre
Max Capacity of
CH System				125
Primary Water Content				1.0
of Boiler (unpressurised)

Temperatures

C.H. Flow Temp (adjustable)

35°C to 85°C max (± 5°C)

D.H.W. Flow Temp (adjustable)

35°C to 65°C max (± 5°C) dependent upon flow rate

Pump - Available Head

		5
		4.5
		4
		3.5
		3
	(wg)	2.5
		2
	Metre
		1.5
		1

0.5

0

0

200

400

600

800

1000

1200

Flow Rate (l/h)

© Baxi Heating UK Ltd 2009

9

5.0 Dimensions and Fixings

		Dimensions
At Least 1.5°	G	E

A 780mm

B 345mm

C 450mm

A

D 116mm Ø Min.

E

185mm

F

190mm

G 131mm

B

360° Orientation

C

D

Tube Ø 100mm

F

Tap Rail

28mm

Condensate

65 mm

65 mm

65 mm

65 mm

65 mm

Drain

Heating

Domestic Hot

Gas

Cold Water

Heating

Pressure Relief

Flow

Water Outlet

Inlet

Inlet

Return

Valve

(22mm)

(15mm)

(22mm)

(15mm)

(22mm)

(15mm)

10 © Baxi Heating UK Ltd 2009

6.0 System Details

6.1Information

1.The Potterton Performa 24 Eco HE Condensing Combination Boiler is ‘Water Byelaws Scheme - Approved Products’.

To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN).

a)IRN 001 - See text of entry for installation requirements and notes.

b) IRN 302 -

Byelaw 14.

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

6.2Central Heating Circuit

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

Treatment of Water Circulating Systems

•All recirculatory water systems will be subject to corrosion unless an appropriate water treatment is applied. This means that the efficiency of the system will

deteriorate as corrosion sludge accumulates within the system, risking damage to pump and valves, boiler noise and circulation problems.

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

•All systems must be thoroughly drained and flushed out. Using, for example Betz-Dearborn Sentinel X300 or X400 or Fernox Superfloc Universal Cleanser. They should be used following the flushing agent manufacturer’s instructions.

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

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

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

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

6.3Bypass

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

6.4System Control

1.The boiler is designed for use in a heating system that incorporates external controls, i.e. a minimum of a timer device.

2.Suitable timer kits are available as optional extras.

3.For optimum operating conditions and maximum economy the fitting of a programmable room thermostat is recommended.

© Baxi Heating UK Ltd 2009

11

6.0System Details

6.5System Filling and Pressurising

	Stop	Double
		Check	Stop
	Valve	Valve	Valve
	DHW	Temporary	CH
		Hose
	Mains		Return
	Inlet

Fig. 4

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

2.There are connection points on the mains cold water inlet and central heating return isolating taps (Fig. 5) to which the optional filling loop kit (Part No. 248221) can be assembled.

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

4.Your attention is drawn to,

for GB: guidance G24.2 and recommendation R24.2 of the Water Regulations Guide.

for IE: the current edition of I.S. 813. “Domestic Gas Installations”.

Fig. 5

Filling Loop

Fig. 6

Pressure Relief Valve

Discharge Pipe

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

6.6Expansion Vessel

(Central Heating only)

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

I.S. 813 “Domestic Gas Installations”.

6.7Safety Pressure Relief Valve (Fig. 6)

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

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

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

4.A remote relief valve kit is available to enable the boiler to be installed in cellars or similar locations below outside ground level (kit no. 5121379).

12 © Baxi Heating UK Ltd 2009

Other Tap

Outlets

Expansion Boiler

Vessel*

Check

Valve*

Pressure Reducer

Valve* To Hot

Taps

Stop Tap

*See 6.8 for instances when

these items may be required

Fig. 7

6.0 System Details

6.8Domestic Hot Water Circuit (Fig. 7)

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

2.Your attention is drawn to:

for GB: Guidance G17 to G24 and recommendation R17 to R24 of the Water Regulations Guide.

for IE: the current edition of I.S. 813. “domestic Gas Installations”.

3.The Water Regulations recommendations for England and Wales prohibits backflow from appliances into the wholesome water supply due to thermal expansion.

However this type of instantaneous combination boiler, with less than 15 litres of stored capacity, does not require any backflow prevention device as any thermal expansion is accommodated within the appliance.

It is possible in certain circumstances that other cold water demands (e.g. washing machines, flushing of W.C.s) may affect the DHW function of the boiler. In these instances the fitting of a backflow prevention device and expansion vessel is recommended.

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

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

6.9Showers

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

6.10Hard Water Areas

1.If the area of the installation is recognised as a HARD WATER AREA then a suitable device should be fitted to treat the mains water supply to the boiler. Contact your Water Distribution Company for advice on suitable devices.

© Baxi Heating UK Ltd 2009

13

								20mm/5mm Min
5mm Min								See * NOTE:
				450mm

200mm Min

780mm

Reset	Burner On	1
	Flame Failure

Power On

200mm Min

Fig. 8

450mm Min

For Servicing

Purposes

5mm Min

In Operation

Fig. 9

7.0Site Requirements

7.1Location

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

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

3.If the boiler is fitted in a room containing a bath or shower reference must be made to the relevant requirements.

In GB this is the current I.E.E. Wiring Regulations and Building Regulations.

In IE reference should be made to the current edition of I.S. 813 “Domestic Gas Installations” and the current ETCI rules.

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

7.2Clearances (Figs. 8 & 9)

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

2.These dimensions include the necessary clearances around the boiler for case removal, access during routine maintenance 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.

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

14 © Baxi Heating UK Ltd 2009

7.0 Site Requirements

7.3 Ventilation of Compartments

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

2. BS 5440: Part 2 Clause 4.2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation.

7.4 Gas Supply

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

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

3. Ensure that the pipework from the meter to the appliance is of adequate size. Do not use pipes of a smaller diameter than the boiler gas connection (22mm).

7.5 Electrical Supply

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

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.

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.

Fig. 10

Gas Service Cock

© Baxi Heating UK Ltd 2009

15

Termination to an internal soil and vent pipe

Boiler

	50mm	per	metre
2.5°			of			pipe
	Minimum					run
		fall

450mm min

					External termination via internal
	Boiler						discharge branch
						e.g sink waste - downstream
Sink	50mm			per				Pipe must terminate
					metre			above water level but
					of			below surrounding
	2.					pipe	run
								surface
	5°		Minimum
					fall

External termination to a drain or gully

Boiler

Pipe must terminate above water level but below surrounding surface

50mm	per
		metre
		of
		pipe
2.5°		Minimum	run
		fall

External termination to a purpose made soak-away

Boiler

50mm	per									500mm min
									Holes in the soak-away must
		metre	of
			pipe
2.5°		Minimum		run					face away from the building
			fall

7.0Site Requirements

7.6Condensate Drain

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

The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5° (50mm per metre) along the entire run.

1.The condensate outlet terminates in a 1” BSP nut and seal for the connection of 21.5mm (3/4in) plastic overflow pipe which should generally discharge internally into the household drainage system. If this is not possible, discharge into an outside drain is acceptable.

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

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

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

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

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

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

7.External runs greater than 3 metres or runs in cold areas should use 32mm waste pipe.

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

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

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

Examples are shown of the following methods of termination:-

i)to an internal soil & vent pipe

ii)via an internal discharge branch (e.g. sink waste)

iii)to a drain or gully

iv)to a purpose made soakaway

16 © Baxi Heating UK Ltd 2009

	Terminal Position with Minimum Distance (Fig. 11)	(mm)
Aa	Directly below an opening, air brick, opening
Ba	windows, etc.	300
	Above an opening, air brick, opening window etc.	300
Ca	Horizontally to an opening, air brick, opening window etc.	300
D	Below gutters, soil pipes or drain pipes.	25
E	Below eaves.	25
F	Below balconies or car port roof.	25
G	From a vertical drain pipe or soil pipe.	25
H	From an internal or external corner.	25
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

LFrom 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

aIn addition, the terminal should be no nearer than 150 mm to an opening in the building fabric formed for the purpose of accommodating

abuilt-in element such as a window frame. See BS 5440 Pt. 1.

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

300 min Terminal

Assembly

Plume

Displacement Kit

TopView Rear Flue

Fig. 12

Property Boundary Line

T

J,K

Air Inlet

U

	R	N	D
				A
		M
			C E
I		I	I	S
		F	B
				F
		L	A	A
		G
			H	H
			I
		Likely flue positions requiring		Fig. 11
		a flue terminal guard

7.0Site Requirements

7.7Flue

NOTE: Due to the nature 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.If a terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be provided.

IMPORTANT:

•Only ONE 25mm clearance is allowed per installation.

•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.

IMPORTANT: If fitting a Plume Displacement Flue Kit, the air inlet must be a minimum of 100mm from any opening windows or doors (see Section 9.0).

Opening Window or Door

100mm

Fig. 12a

MIN.

I

J,K

© Baxi Heating UK Ltd 2009

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