Baxi Potterton Combi 24 HE, Main Combi 24 HE Installation & Service Instructions Manual

Installation & Service Instructions;

This is a Wall Mounted Powered Flue Condensing Combination Boiler Gas Fired Central Heating Unit.

The boiler meetsthe requirements of Statutory Instrument" The Boiler (Efficiency) Regulations 1993 N°3083" and is deemed to meet the requirements of Directive 92/42/EEC on the energy efficiency requirements for new hot water boilers fired

with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by: Notified Body 0051.

Product/Production certified by: Notified Body 0051.

For use in GB/IE only.

These instructions include the Benchmark Commissioning Checklist and should be left with the Userfor safe keeping.

MAIN

Combi 24 HE

Natural Gas

Main Combi 24 HE G.C.N' 47 474 02

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Building Regulations and the Benchmark

Commissioning Checklist

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

CORGI operate a Self Certification Scheme for gas heating appliances.

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

With the introduction of Self Certification Schemes, the Benchmark Logbook is being withdrawn.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

the back of these instructions.

Baxi PoUerton 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.

W.RII,

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CONTENTS

Section

Page

Legislation

1.0 Introduction 5

2.0

General Layout

3.0

Appliance Operation

4.0 Technical Data 8

5.0

Dimensions and Fixings

6.0

System Details

7.0

Site Requirements

8.0

Installation

9.0

Commissioning

10.0 Completion

11.0 Servicing the Boiler

12.0 Changing Components

13.0 Electrical 39

14.0 Short Parts List 40

15.0

Fault Finding

Benchmark Checklist 46

INSTALLER NOTIFICATION GUIDELINES

Install and Commission this

appliance to manufacturer's

instructions

Complete the

Benchmark Checklist

Competent Person's

Self Certification Scheme

Building Control

If you notify via CORGI Scheme,

CORGI will th~n notify the

relevant Local Authority

Building Control Scheme

on member's behalf

Contact your relevant Local

Authority Building Control

(LABC) who will arrange

an inspection or contact a government approved

inspector

Scheme Members only

Call CORGI on: 0870 88 88 777

or log onto:

www.corgi-notify.com

within 10 days

You must ensure that the

notification number issued by

CORGI is writen onto the

Benchmark Checklist

"'"

CORGI will record the data and

will send a certificate of

compliance to the property

LABC will record the data

and will issue a

certificate of compliance

IMPORTANT -Installation, Commissioning, Service & Repair

This appliance must be installed in accordance with the manufacturer's instructions and the regulations in force. Read the instructions fully before

installing or using the appliance. .

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

Definition of competence: A person who works for a CORGI registered

company and holding current certificates in the relevant ACS modules, is deemed competent.

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

Lifting -This product should be lifted and handled by two people. Stooping

should be avoided and protective equipment worn where necessary. Carrying & lifting equipment should be used as required, e.g. when installing in a loft space.

The addition of anything that may interfere with the normal operation of the appliance without express written permission from the manufacturer or his

agent could invalidate the appliance warranty. In GB this could also infringe the Gas Safety (Installation and Use) Regulations.

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

All CORGI registered installers carry a CORGI identification card and have a registration number. You can check your installer is registered by telephoning

08704012300 or writing to:-

1 Elmwood,

Chineham Business Park,

Crockford Lane,

Basingstoke. RG24 8WG

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

LEGISLATION

Baxi Potterton declare that no substances harmful to health are contained in the appliance or used

during appliance manufacture.

"'(heappliance is suitable only for installation in GB

and IEand should be installed in accordance with

the rules in force, and only used in a suitably ventilated location.

In GB, the installation must be carried out by a CORGI Registered Installer. It must be carried out in accordance

with the relevant requirements of the:

.Gas Safety (Installation & Use) Regulations.

.The appropriate Building Regulations either The

Building Regulations, The Building Regulations (Scotland), Building Regulations (Northern Ireland).

.The Water Fittings Regulations or Water Byelaws in

Scotland.

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

Where no specific instructions are given, reference should be made to the relevant British Standard Code of

Practice.

In IE, the installation must be carried out by a competent Person and installed in accordance with the current

edition of I.S. 813 'Domestic Gas Installations', the current Building Regulations and reference should be

made to the current ETCI rules for electrical installation.

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

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 suppliesfor

domestic purposes. Forced circulation hot water systems. Installation of gas fired hotwater boilers.

Flues. Ventilation. Expansion vessels and ancillary equipment for sealed watersystems.

Treatment of water in domestic hot water central heating systems.

BS 5449 BS 6798 BS 5440 Part 1 BS 5440 Part 2 BS 7074

BS 7593

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. Forced circulation hot water systems. Expansion vessels and ancillary equipment for sealed water systems. Treatment of water in domestic hot water

central heating systems.

BS 5449 BS 7074

BS 7593

1.0

INTRODUCTION

1.1

Description

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

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

25.2 kW (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. 5111073.

8. All systems must be thoroughly flushed and treated

with inhibitor (see section 6.2).

1.2

Optional Extras

1. Various flue extensions, bends, vertical flue kits,

control accessories etc. are available as optional extras. These are detailed in a separate publication.

Case Front Panel

Control Box .....................

Fig. 1

Data Badge

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

installingor usingtheappliance. '

In GB, this must be carried out by a competent person as stated in the Gas

Safety (Installation & Use) Regulations.

Definition of competence: A person who works for a CORGI registered

company and holding current certificates in the relevant ACS modules, is deemed competent.

In IE, this must be carried out by a competent person as stated in I.S. 813

"Domestic Gas Installations".

Lifting -This product should be lifted and handled by two people. Stooping

should be avoided and protective equipment worn where necessary. Carrying & lifting equipment should be used as required, e.g. when installing in a loft space.

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

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

supply conditions.

All CORGI registered installers carry a CORGI identification card and have a

registration number. You can check your installer is registered by telephoning

08704012300 or writing to:-

1 Elmwood,

Chineham Business Park,

Crockford Lane,

Basingstoke. RG24 8WG

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

LEGISLATION

Baxi Potterton declare that no substances harmful

to health are contained in the appliance or used during appliance manufacture.

"(heappliance is suitable only for installation in GB and IEand should be installed in accordance with

the rules in force, and only used in a suitably ventilated location.

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

.Gas Safety (Installation & Use) Regulations.

.The appropriate Building Regulations either The

Building Regulations, The Building Regulations (Scotland), Building Regulations (Northern Ireland).

.The Water Fittings Regulations or Water Byelaws in

Scotland.

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

Where no specific instructions are given, reference

should be made to the relevant British Standard Code of Practice.

In IE, the installation must be carried out by a competent

Person and installed in accordance with the current edition of I.S. 813 'Domestic Gas Installations', the current Building Regulations and reference should be

made to the current ETCI rules for electrical installation.

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

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. Forced circulation hot water systems. Installation of gas fired hot water boilers.

Flues. Ventilation.

Expansion vessels and ancillary equipment for sealed water systems.

Treatment of water in domestic hot water central heating systems.

BS 5449

BS 6798

BS 5440 Part 1

BS 5440 Part 2

BS 7074

BS 7593

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.

Forced circulation hot water systems. Expansion vessels and ancillary equipment

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

central heating systems.

BS 5449

BS 7074

BS 7593

:..~ h c=:>."""On

i ~ c=:> ,F,;I""

i Q c=:> Pow"ion

, j i

21 22

Fig.2

Fig.3

10 9

2.0

GENERAL LAYOUT

2.1

Layout

Air Pressure Switch

Expansion Vessel

3. Burner Manifold

Automatic Air Vent

DHW Plate Heat Exchanger

Circulation Pump

Drain Off Point

8. Pressure Relief Valve

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

) j

""""".....4

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 Ternperature Control

3.0

APPLIANCEOPERATION

NOTE: All delay timers mentioned in 3.1 and 3.2

are overridden by domestic hot water demand.

3.1

Central Heating Mode (Fig. 4)

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.

':I I

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.

3.2

Domestic Hot Water Mode (Fig. 5)

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 causes 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.

Fig. 4

Central Heating Circuit

Key

1 PrimaryHeat Exchanger 2 Burner

3 Ignition Electrode

4 Flame Sensing Electrode 5 Gas Valve

6 Pump 7 AutomaticAir Vent

8 Plate Heat Exchanger 9 Flow Sensor with Filter 10 Pressure ReliefValve

11 Boiler Drain Point 12 Heating Return

13 Cold Water Inlet On/Off Valve and Filter

14 Gas Inlet 15 Domestic Hot Water Outlet 16 Heating Flow 17 Pressure Gauge 18 Hydraulic Differential PressureSensor Microswitch

19 Automatic By-Pass 20 Hydraulic Differential Pressure Sensor 21 Diverter Valve Assembly 22 Domestic HotWater Flow PriorityAssembly 23 Domestic HotWater Flow PriorityMicroswitch 24 Temperature Sensor 25 Overheat Thermostat 26 Expansion Vessel 27 Secondary Heat Exchanger

Fig. 5

Domestic Hot Water Circuit

Heat Output CH(Non-Condensing)

Max Min

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

Max Gas Rate (Natural Gas - G20)

(After 10 mins)

m3/h 2.62

Burner Pressure (NaturalGas - G20)

Max Rate Min Rate

mbar 10.2 :t 0.5 2 :t 0.2

Inlet Pressure (Natural Gas - G20)

mbar 20

Burner Injector (Natural Gas - G20)

15x 1.18mm Diameter

Electrical Supply 230V- 50Hz

(Appliance must be connected to an earthed supply)

Power Consumption

170W

External Fuse Rating

Internal Fuse Rating

Fuse 2A Fast Blow to BS 4265

4.0

Electrical Protection IPX4D

NOx Class

Condensate Drain

1" BSP

Flue Terminal Dimensions

Diameter

Projection

100mm 125mm

Connections

Gas Supply Central Heating Flow Central Heating Return

Cold Water Mains Inlet DHW Flow

Pressure Relief Discharge -

copper tails

22mm 22mm 22mm 15mm 15mm 15mm

Outercase Dimensions Casing Height Overall Height Inc Flue

Elbow Casing Width Casing Depth

780mm

965mm 450mm 345mm

Clearances Above Casing Below Casing

Front Front L.H. Side R.H. Side

200 mm Min 200 mm Min

450 mm Min (For Servicing) 5 mm Min (In Operation)

5 mm Min 5 mm Min (In Operation) 20 mm 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

Packaged Boiler Carton Installation Lift Weight

43.5

4.5 4

3.5 3

E2.5

~ 2

::;

1.5

0.5 0

0 200

TECHNICAL DATA

Central Heating Primary Circuit

Pressures

Pump

AvailableHead

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

Primary Water Content of Boiler (unpressurised)

125

1.0

Temperatures

C.H. Flow Temp (adjustable)

35°C to 85°C max(:t 5°C)

D.HW. Flow Temp

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

Pump - Available Head

400 600 800 1000 1200

Flow Rate (I/h)

Appliance Type

C12

C32

Appliance Category

CAT II2H 3P

Heat Input CH

Max Min

kW 24.8 10.6

LPG Propane - G31 Burner Injector 15 x O.77mm diameter

Burner Pressure

Max Rate IMinRate

Propane

mbar 21.8 :t 0.514.4 :t 0.2

Inlet Pressures

mbar

bar

Safety Discharge

Max Operating

2.5

Min Operating

0.5

Recommend Operating

1-2

DHW Circuit bar Pressures

Max Operating

Min Operating

0.2

Min Operating Pressure at 11.1 I/min 0.9

Flow Rates I/min

DHW Flow Rate

@30°CRise 11.5

DHW Flow Rate

@35°CRise 9.8

Min Working DHW Flow Rate 2.5

5.0 DIMENSIONS AND FIXINGS

k- B j

3600 Orientation

L F0::11 :

D ,_I--n~

\ I ",

f:k]

- . ,,' .

--.'-'-

i7771r~ '

Fig.6

Heating

Flow

Dimensions

A 780mm

B 345mm

C 450mm

D 116mm0 Min.

E 185mm

F 190mm

G 131mm

, Tube 0 100mm

Gas Inlet

Condensate

Drain

u0 -.

68mm :

:11( .'

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -,- - - - - - --

: j

Heating

Return

--$--

Domestic Hot : Cold Water

Water Outlet ; Inlet

---U---u---ui u --0- un. u0r

65mm ' 65mm - : - 65mm -~

95mm

, ,

u0- u--- u$--

: - 65mm - ,

Left Hand Side

of Boiler

265mm

165.7mm

View from under the appliance

130mm

Fig. 7

6.0 SYSTEM DETAILS

6.1 Information

1. The Main Combi 24 HE Condensing Combination Boiler is a 'Water Byelaws Scheme - Approved Product'. To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN).

a) IRN 001 - Seetext of entry for installation

requirements and notes.

b) IRN 302 - Byelaw 14.

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

6.2

Central Heating Circuit

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

Treatment of Water Circulating Systems

.All recirculatory water systems will be subject to

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

.When upgrading existing systems that exhibit evidence

of sludging, it is advisable to clean the system prior to treatment in order to remove any sludge and reduce the likelihood of these deposits damaging new components.

.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. The recommended flushing and cleansing agents are Betz-Dearborn Sentinel X300 or X400 and Fernox

Superfloc Universal Cleanser which should be used following the flushing agent manufacturer's instructions.

.System additives -corrosion inhibitors and flushing

agents/descalers should be suitable for aluminium and comply to BS7593 requirements. The only system

additives recommended are Betz-Dearborn Sentinel X100 and Fernox-Copal which should be used following the

inhibitor manufacturer's instructions.

Failure to flush and add inhibitor to the system will

invalidate the appliance warranty.

.It is important to check the inhibitor concentration

after installation, system modification and at every service in accordance with the manufacturer's

instructions. (Test kits are available from inhibitor stockists.)

.For information or advice regarding any of the above

contact Technical Enquiries.

6.3

Bypass

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

6.4

System Control

1. The boiler is designed for use in a heating system

that incorporates external controls, Le. a minimum of a timer device.

2. An integral electro-mechanical or electronic timer is available as an optional extra.

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

recommended.

6.0 SYSTEM DETAILS

6.5

SystemFilling and Pressurising

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

2. There are connection points on the mains cold water inlet and central heating return isolating taps 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".

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.

6.6

Expansion Vessel (Central Heating only)

1. The appliance expansion vessel is pre-charged to

0.5 bar. Therefore, the minimum cold fill pressure is

0.5 bar. The vessel is suitable for correct operation for system capacities up to 125 litres. For greater system capacities an additional expansion vessel must be fitted. For GB refer to BS 7074 Pt 1. For IE, the current edition of I.S. 813 "Domestic Gas

Installations" .

6.7

Pressure Relief Valve (Fig. 9)

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 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.

Double Stop Check Valve Valve

Stop

Valve

DHW Mains Inlet

... .-

Temporary

Hose

CH Return

Fig. 8

Pressure Relief Valve

Fig. 9

Discharge Pipe

Other Tap Outlets

Check Valve

Stop Tap

Expansion Vessel

6.0

SYSTEM DETAILS

6.8

Domestic Hot Water Circuit

Boiler

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 1.8.813 "Domestic Gas Installations" .

To Hot Taps

3. A single check valve must be fitted as shown in Fig. 10 to prevent backflow to the supply pipe and to ensure the efficient operation of the expansion vessel which is required to accommodate the thermal expansion of the water.

Fig. 10

4. When the domestic water system includes any device which prevents water expanding back towards the supply (check valve, loose jumpered stopcock, water meter, water treatment device) then an expansion vessel must be fitted (eg. Zilmet 160ml, R'1215bar).

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

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

6.9 Showers

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

refer to the shower valve manufacturer.

6.10

Hard Water Areas

1. 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.

7.0 SITE REQUIREMENTS

7.1

Location

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

7.3).

2. If the boiler is sited in an unheated enclosure then it is recommended that frost protection is incorporated in

the control system.

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 lEE. Wiring Regulations and

Building Regulations.

In IE reference should be made to the current edition of I.S. 813 "Domestic Gas Installations" and the

current ETCI rules.

4. If the boiler is to be fitted into a building of timber frame construction then reference must be made to

the current edition of Institute of Gas Engineers

Publication IGE/UP/7 (Gas Installations in Timber Framed Housing).

7.2

Clearances (Fig. 11 & 12)

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.

* NOTE: The boiler can be operated with a ctearance 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.

450mm

20mm/5mm Min

see *NOTE:

200mm Min

780mm

Fig. 11

200mm Min

---L

450mm Min

01( .-

For Servicing

Purposes

5mm~ L

In Operation

Fig. 12

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 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 isthe 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. 13).

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

Fig. 13

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.

Gas Service Cock

2. The mains supply is 230V -50Hz fused at 3A

maximum.

NOTE: The method of connection to the

electricity supply must facilitate complete electrical isolation of the appliance.

Connection may be via a fused double-pole

isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system

controls only.

+ 35 hidden pages

Baxi Potterton Combi 24 HE, Main Combi 24 HE Installation & Service Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual