Baxi Combi 130 HE Quick Start Manual

Please leave these instructions with the user

Baxi Combi 130 HE

Gas Fired Wall Mounted Condensing

Combination Boiler

Installation & Servicing Instructions

Baxi is one of the leading manufacturers of domestic

heating products in the UK.

Our first priority is to give a high quality service to our

customers. Quality is designed into every Baxi product

- products which fulfil the demands and needs of

customers, offering choice, efficiency and reliability.

To keep ahead of changing trends, we have made a

commitment to develop new ideas using the

latest technology - with the aim of continuing to make

the products that customers want to buy.

Everyone who works at Baxi has a commitment to

quality because we know that satisfied customers

mean continued success.

We hope you get a satisfactory service from Baxi. If

not, please let us know.

Natural Gas

Baxi Combi 130 HE

G.C.No47 075 04

Baxi is a BS-EN ISO 9001

Accredited Company

The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency) Regulations 1993 N

3083” and is deemed to meet the requirements of Directive 92/42/EEC on the energy efficiency requirements for new hot water boilers fired with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by: Notified Body 0086.

Product/Production certified by: Notified Body 0086. Ref: 86-BL-647

For GB/IE only.

0.0 Legislation 4

1.0 Introduction 5

2.0 General Layout 6

3.0 Appliance Operation 7

4.0 Technical Data 8

5.0 Dimensions and Fixings 9

6.0 System Details 10

7.0 Site Requirements 13

8.0 Installation 19

9.0 Electrical 26

10.0 Commissioning the Boiler 28

11.0 Fitting the Outer Case 32

12.0 Servicing the Boiler 33

13.0 Changing Components 35

14.0 Short Parts List 46

15.0 Fault Finding 47

16.0 Operational Flow Chart 58

Section Page

Contents

0.0 Legislation

Baxi declare that no substances harmful to

health are contained in the appliance or used

during appliance manufacture.

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

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

• Gas Safety (Installation & Use) Regulations.

• The appropriate Building Regulations either The

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

• The Water Fittings Regulations or Water Byelaws in Scotland.

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

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

In IE, the installation must be carried out by a competent person and installed in accordance with the current edition of I.S. 813 ‘Domestic Gas Installations’, the current Building Regulations and reference should be made to the current ETCI rules for electrical installation.

All systems must be thoroughly flushed and treated with inhibitor (see section 6.0).

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, or valid ACoP equivalents, 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.

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.

“Benchmark” Installation, Commissioning and Service Record Log Book

Please ensure that your installer has completed the Installation and Commissioning sections of the Log Book and hands the Log Book over. The details of the Log Book will be required in the event of any warranty work. Keep the Log Book in a safe place and ensure that the relevant sections are completed at each subsequent regular service visit.

All CORGI registered installers carry a CORGI identification card and have a registration number. Both should be recorded in your boiler Log Book. You can check your installer is registered by telephoning +44 (0)1256 372300 or writing to:-

1 Elmwood,

Chineham Business Park,

Crockford Lane,

Basingstoke. RG24 8WG

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.

This boiler is fitted with a flow switch interlock that prevents it from firing when the heating demand is satisfied.

1.1 Description

1. The Baxi Combi 130 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 preset to give a maximum output of

23.9 kW (81,500 Btu/h) for central heating and

39.0 kW (133,000 Btu/h) for hot water. In central heating mode the boiler will automatically adjust down to 10.6 kW (36,000 Btu/h) according to system load.

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

4. Check the local supply conditions before installation.

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

6. 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).

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

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

9. The boiler must be installed with one of the purpose designed flues such as the standard horizontal flue kit, part n

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.

1.0 Introduction

Fig. 1

Fig. 2

Lower Door Panel

Air Box Door

Data Badge

2.0 General Layout

2.1 Layout

1. Wallplate

2. Flue Elbow

3. Air Box

4. Heat Exchanger

5. Burner

6. Fan Protection Thermostat

7. Fan Assembly

8. DHW Plate Heat Exchanger

9. Three Way Valve

10. Facia Box

11. Primary Water Pressure Gauge

12. Gas Tap

13. Circulation Pump

14. Pressure Relief Valve

15. Return Thermistor

16. Gas/Air Ratio Valve

17. Transformer

18. Flow Temperature Safety Thermostat

19. Flow Temperature Thermistor

20. Manual Air Vent

21. Automatic Air Vent

22. Flow Switch (Dry Fire Protection)

23. Condensate Trap

24. Expansion Vessel

2.2 Optional Extras

KIT PART N

FLUE EXTENSION KITS (110/70) Horizontal Flue Kit 4M max Flue Extension 0.25M 241692 Flue Extension 0.5M 241694 Flue Extension 1M

(Use two kits for 2M etc.) 241695

Flue Bend - 45°

(Reduce overall length of flue

by 0.5m when fitting this bend)

241689

Flue Bend - 90° (

Reduce overall length of flue

by 1m when fitting this bend)

241687

VERTICAL FLUE KITS (110/70) 5M max Vertical Flue Terminal 242802 Vertical Boiler Connection 242886

VERTICAL FLUE (80/80) Kit Boiler Connection Twin 242757

CONTROL ACCESSORIES Programmable Room Thermostat (Intellistat) 247495 Electro-Mechanical Timer 247498

Filling Loop Kit 247500

Expansion Vessel removed for clarity

3.0 Appliance Operation

NOTE: All delay timers mentioned in 3.1 and 3.2 are overridden by domestic hot water demand.

3.1 Central Heating Mode

1. With a demand for heating, the pump circulates water through the primary circuit. At a flow rate of approximately 4.5 l/hr the central heating flow switch operates, initiating the ignition sequence.

2. The burner ignites at low rate, then the gas control system modulates the heat input to maintain the heating temperature measured by the thermistor sensor.

3. When the boiler reaches temperature, a 1 minute pump overrun occurs followed by 3 minutes anticycle. If the flow temperature is low enough the burner will then relight automatically otherwise pump overrun and anticycle will occur again.

3.2 Domestic Hot Water Mode

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 and the 3-way valve will 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 return thermistor.

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.

3.3 Boiler Frost Protection

1. The boiler incorporates an automatic integral frost protection feature (see section 10.4). It will operate in both summer and winter modes. If the boiler temperature falls below 8°C (± 5°) then the boiler will fire until a temperature of 15°C (± 5°) is reached.

3.4 System Frost Protection Mode

1. The boiler incorporates an integral system frost protection feature. This can be activated (see section 10.4) if required. To monitor system temperature the boiler will switch on the pump every four hours in both summer and winter modes. If water returned to the boiler is below 8°C (± 5°) the boiler frost protection mode is automatically activated. Due consideration should be taken to the siting of the appliance when using this option. It may be preferable to fit an external frost thermostat to the system. In this instance the integral system frost protection feature need not be activated.

3.5 Pump Protection

1. The control system continually monitors the time since the pump last operated. This will result in the pump being run for 1 minute if it has not run in the last 24 hours to prevent seizure.

4.0 Technical Data

Flue Terminal Diameter 110mm Dimensions Projection 150mm

Outercase Dimensions

Casing Height - 850mm Overall Height Inc Flue Elbow - 1000mm Casing Width - 490mm Casing Depth - 320mm

Clearances

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

Weights kg lb Packaged Boiler Carton 62.5 137.8 Packaged Flue Kit 3.8 8.4 Weight Empty 55.7 122.8 Installation Lift Weight 45.9 101.2

Central Heating Primary Circuit Pressures

bar lb/in

Safety Discharge 3 43.5 Max Operating 2.5 36.3 Min Operating 0.7 10.2 Recommend Operating 1-2 14.5-29

DHW Circuit bar lb/in

Pressures

Max Operating 10 145 Min Operating 0.1 1.45

Min Operating Pressure at 16 l/min 1.6 23.2

Flow Rates l/min gal/min DHW Flow Rate @ 30o C Rise 18.7 4.11

DHW Flow Rate @ 35o C Rise 16 3.52

Min Working DHW Flow Rate 3.5 0.77

Pump

Available Head See graph below

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

bar lb/in

Min Pre-charge Pressure 0.95 13.8

Nominal Pre-charge Pressure 1 14.5

litre gal Max Capacity of CH System 125 27.5 Primary Water Content of Boiler (unpressurised) 1.5 0.33

Connections copper tails Gas Supply - 22mm Central Heating Flow - 22mm Central Heating Return - 22mm Cold Water Mains Inlet - 15mm DHW Flow - 22mm Pressure Relief Discharge - 15mm Condensate Drain - 1” BSP

Recommended System Temperature Drop

Normal 11°C Condensing 20°C

Temperatures

C.H. Flow Temp (adjustable)

45° C to 82° C max (± 0.5° C)

D.H.W. Flow Temp (adjustable)

35° C to 55° C max (± 0.5° C) dependent upon flow rate

Heat Input Gross DHW Max

kW 45.45

Btu/h 155,000

Heat Output CH

Non Condensing (70°C Mean Water temp)

Max Factory Set

kW 30.0 23.9

Btu/h 102,000 81,500

Condensing (40°C Mean Water temp)

Max Factory Set

kW 31.4 25.1

Btu/h 107,000 85,600

Electrical Supply 230V~ 50H

(Appliance must be connected to an earthed supply)

Power Consumption 200W

External Fuse Rating 3A

Internal Fuse Rating 2AH

Appliance Category CAT I

Max Gas Rate (Natural Gas)

(After 10 Mins)

m3/h 4.2

ft3/h 148.3

Inlet Pressure (Natural Gas)

mbar 20

in wg 8

(see section 10.1)

Appliance Type C

NOxClass 5

DHW Expansion Vessel

See Section 6.7 for information

Where flow rates are required in excess of 840 l/h

please contact the Baxi

Technical Department for advice (Telephone number on the back cover).

The efficiency is 90.7%

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 For

Combi 130 HE

Heat Input Gross CH

Max Factory Set

kW 33.7 26.95

Btu/h 115,000 92,000

Electrical Protection IP 44

Pump - Available Head

Metre wg

l/h

0 1250

gal/min

0 0.9 1.8 2.75 3.7

250 500 750 1000

4.625

5.0 Dimensions and Fixings

Key To Support Bracket

1 Domestic Hot Water Outlet 4 Central Heating Flow

2 Cold Water Inlet 5 Central Heating Return

3 Gas Supply 6 Pressure Relief

Support Bracket

1 2 3 4 5

63 mm

62 mm 77 mm 74.5 mm

Tap Rail

Top View of Tap Rail

C/L

50 mm

360° Orientation

Tube Ø 110mm

3°

(1 in 20)

DIMENSIONS

A 850mm

B 320mm

C 490mm

D 125mm Ø Min.

E 150mm

F 136mm

SIDE FLUE (left and right)

For every 1m of horizontal flue length, the clearance above the top of the flue elbow should be 55mm to incorporate the 3° (1 in 20) fall in the flue from the terminal to the elbow.

The 3° (1 in 20) 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)

55mm

110mm

165mm

3°

(1 in 20)

6.0 System Details

6.1 Information

In GB it is necessary to comply with the Water Supply (Water Fittings) Regulations 1999 (or for Scotland, The Water Byelaws 2000, Scotland). The Baxi Combi 130 HE Combination Boiler is an Approved Product under the Water Regulations.

To comply with the Water Regulations your attention is drawn to The Water Regulations Advisory Service (WRAS) which gives full details of the requirements.

In IE the requirements given in the current edition of I.S. 813 “Domestic Gas Installations” and the current Building Regulations must be followed.

6.2 Central Heating Circuit

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

This boiler is fitted with a flow switch interlock that prevents it from firing when the heating demand is satisfied.

The boiler is designed so that it will heat the house to the desired room temperature as quickly as possible by running at the maximum boiler flow temperature of 82°C.

When the room temperature is achieved the boiler will then reduce the radiator temperature to as low a level as possible, while still achieving the desired room temperature, thereby giving the most efficient use of gas and the most comfortable room temperature possible.

The boiler will be able to achieve this performance if a room thermostat is fitted or with a fully TRV’d system without a bypass. If the system is fully TRV’d with a bypass then this feature will not be available, in this case the radiator temperature can be reduced to provide more efficient operation. (see User instructions).

• If the hot water delivery is greater than 18 litres/minute the flow regulator must be fitted to the Domestic Hot Water inlet (A pint milk bottle will fill in under 2 seconds).

• If the boiler is to be uprated to 100,000 Btu/hr CH output, an extra standard pump will be required and the commissioning procedure will take approximately 30 minutes longer.

• The condensate drain and pipes must be free from leaks.

• Any timer and thermostat should be removed before installing optional Intellistat as it will override their operation.

• Treatment of Water Circulating Systems

All water circulating systems will be subject to corrosion unless an appropriate water treatment is applied. Without treatment 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.

For optimum performance after installation this boiler and its associated central heating system must be flushed in accordance with the guidelines given in BS 7593:1992. “Treatment of water in domestic hot water central heating systems”.

This must involve the use of a proprietary cleanser, such as BetzDearborn Sentinel X300 or X400, Fernox Superfloc or Salamander System Cleanser. Full instructions are supplied with the products, but for immediate information please contact BetzDearborn (0044 (0)151 420 9563), Fernox (0044 (0)1799 550 811) or Salamander (0044 (0)121 378 0952) directly.

For long term protection against corrosion and scale, after flushing it is necessary that an inhibitor such as BetzDearborn Sentinel X100, Fernox MB-1 or Copal or Salamander System Inhibitor is dosed in accordance with the guidelines given in BS 7593:1992.

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

6.0 System Details

6.3 System 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 the Baxi Intellistat, is recommended.

6.4 System Filling and Pressurising

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

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

3. Your attention is drawn to, for GB: Guidance G24.2 and recommendation R24.2 of the Water Regulations Guide. for IE: the current edition of I.S. 813. "Domestic Gas Installations".

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

5. To aid removal of air from the system whilst filling, move the diverter valve to the CH position by using the installer parameters (see Section 10.5).

6.5 Expansion Vessel - CH only(Fig. 4)

1. The appliance expansion vessel is pre-charged to 1 bar (10 lb/in

). Therefore, the minimum cold fill pressure is 1 bar. The vessel is suitable for correct operation for system capacities up to 125 litres (27.5gal). For greater system capacities an additional expansion vessel must be fitted. For GB refer to BS 7074 Pt 1. For IE, the current edition of I.S. 813 “Domestic Gas Installations”.

6.6 Pressure Relief Valve (Fig. 4 & 5)

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

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

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

Fig. 3

Fig. 5

Stop Valve

Double Check Valve

DHW Mains Inlet

CH Return

Temporary Hose

Discharge Pipe

Pressure Relief Valve

Expansion Vessel removed for clarity

Fig. 4

Expansion Vessel

Stop Valve

6.0 System Details

6.7 Domestic Hot Water Circuit

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".

Sealed primary circuits and/or secondary hot water systems shall incorporate a means for accommodating the thermal expansion of water to prevent any discharge from the circuit and/or system, except in an emergency situation.

3.When the 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 (e.g. Zilmet l6Oml, R1/2 l5 bar). A check valve must also be fitted on the supply as shown, to ensure efficient operation and also to prevent the reverse flow of hot water into the supply pipe.

4. 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.

5. The boiler’s maximum working mains pressure is 10 bar (150 lb/in

), therefore all pipework, connections, fittings, etc. should be suitable for pressures in excess of 10 bar. A pressure reducing valve must be fitted for pressures in excess of 10 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.

6.8 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.

6.9 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.

Key

1 Expansion Vessel 2 Flow Thermostat 3 Flow Thermistor 4 Flow Switch 5 Primary Heat Exchanger 6 Gas Valve 7 DHW Plate Heat Exchanger 8 DHW Flow 9 DHW Mains Inlet 10 Flow Regulator 11 DHW Flow Switch

Boiler

Other Tap Outlets

Expansion Vessel

To Hot Taps

Check Valve

Pressure Reducer Valve

Stop Tap

12 Gas Inlet 13 Filling Loop 14 CH Flow Valve 15 Filter 16 CH Return Valve 17 Pressure Gauge 18 Pump 19 Pressure Relief Valve 20 Return Thermistor 21 3 Way Valve

129

7.0 Site Requirements

Zone 2

Zone 1

Zone 0

Zone 2

Zone 3

Zone 2

Window Recess

0.6 m

2.4 m

Ceiling

Outside Zones

Zone 3

Zone 2

Zone 1

Zone 0

2.25 m

Zone 2

Window Recess

3.0 m

2.4 m

0.6 m

Fig. A

Fig. B

In GB Only

7.1 Location

1. The boiler may be fitted to any suitable nonflammable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permitting satisfactory removal of combustion products and providing an adequate air supply. The boiler should be fitted within the building unless otherwise protected by a suitable enclosure i.e. garage or outhouse. (The boiler may be fitted inside a cupboard - see Section 7.2).

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

3. If the boiler is fitted in a room containing a bath or shower, it can only be fitted in zone 3, (Figs. A & B shows zone dimensions for a bathtub. For other examples refer to Section 601 of the Current I.E.E. Wiring Regulations) reference must be made to the relevant requirements. In GB this is the current I.E.E. Wiring Regulations and Building Regulations. In IE reference should be made to the current edition of I.S. 813 “Domestic Gas Installations” and the current ETCI rules.

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

7.2 Ventilation of Compartments

1. Where the appliance is installed in a cupboard or compartment,

no air vents are required. The appliance will run sufficiently cool without extra ventilation.

Minimum Cupboard Size (inside dimensions) Height - 1250mm Width - 590mm Depth - 400mm

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.

2. BS 5440: Part 2 Clause 4.2 refers to room sealed appliances installed in compartments.

7.0 Site Requirements

7.3 Clearances (Fig. 6 & 7)

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.

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.

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.

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

200mm

850mm

490mm

200mm

5mm Min

5mm

500mm

For Servicing

Purposes

Fig. 6

Fig. 7

In Operation

3°

(1 in 20)

320mm

7.0 Site Requirements

Boiler

2.5° Minimum fall

Termination to an internal soil

and vent pipe

450mm min

Boiler

2.5° Minimum fall

External termination via internal

discharge branch

e.g sink waste - downstream

Sink

Pipe must terminate above water level but below surrounding surface

Boiler

Pipe must terminate above water level but below surrounding surface

2.5° Minimum fall

Termination to a drain or gully

Boiler

500mm min

2.5° Minimum fall

Termination to a purpose made

soak-away

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

7.6 Condensate Drain

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

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

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

discharge pipe.

1. The condensate outlet terminates in a 1” BSP nut and seal for the connection of 21.5mm (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. Any pipe fitted externally must not exceed 3 metres.

7. Any condensate discharge pipework external to the building (or in an unheated part of it e.g. garage) must be insulated to protect against frost. It is also recommended that the pipe diameter is increased to 32mm.

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

7.0 Site Requirements

J,K

D E

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. Take into consideration the effect the plume of vapour may have on neighbours when siting the flue.

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. 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.

4. For installation of the flue into an internal corner at the 25mm dimension the flue deflector kit (part no. 248167) must be fitted.

5. * Reduction to the boundary is possible down to 25mm but the flue deflector kit (part no.

248167) must be fitted.

6. For fitting under low soffits and eaves it is acceptable for the flue to project upto 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.

7. If a terminal is less than 2 metres (78

/4in) above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be provided.

Fig. 10

Fig. 9

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

Table. 1

Terminal Position with Minimum Distance (Fig. 10) (mm)

AaDirectly below an opening, air brick, opening

windows, etc. 300 BaAbove an opening, air brick, opening window etc. 300 CaHorizontally 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

(i)

or external

(ii)

corner.

(i)

(ii)

115 I Above ground, roof or balcony level. 300 J From a surface 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

In 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. See BS 5440 Pt. 1.

7.0 Site Requirements

7.8 Flue Dimensions

See Section 2.2. The standard horizontal flue kit allows for flue lengths between 270mm and 800mm from elbow to terminal (Fig. 11).

The maximum permissible equivalent flue length is: 4 metres horizontal (Fig. 12).

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.

7.9 Terminal Guard (Fig. 13)

1. When codes of practice dictate the use of terminal guards, they can be obtained from most Plumbers’ and Builders’ Merchants.

2. There must be a clearance of at least 50mm between any part of the terminal and the guard.

3. When ordering a terminal guard, quote the appliance name and model number.

4. The flue terminal guard should be positioned centrally over the terminal and fixed as illustrated.

Fig. 11

Fig. 12

Pictorial examples of flue runs where EQUIVALENT flue length equals 4m

Fig. 13

270mm

800mm

0.5m

7.0 Site Requirement

Key Accessory Size Baxi Code

Number

Concentric Flue System 110mm diameter

A Horizontal flue kit 850mm 236921 B Straight extension kit 1000mm 241695

500mm 241694

250mm 241692 C Bend kit 93° 241687 D Bend kit (pair) 45° 241689 E Horizontal flue terminal 243013BAX

Clamp 110mm 243014BAX

Twin Flue System 80mm diameter

F Straight extension kit 1000mm 238690

500mm 238692

250mm 238694 G Bend kit 90° 246139 H Bend kit (pair) 45° 246138

Universal Vertical Flue Kits

J Twin flue adaptor kit 242757 K Vertical flue terminal 242802 L Universal roof tile 25°/50° 243015 M Roof cover plate kit 243131 N Flat roof flashing 243016BAX R Boiler connection vertical concentric 242886

Clamp 80mm 238684

7.10 Flue options

Concentric The maximum equivalent lengths are 4m (horizontal) or 5m (vertical). These lengths exclude the standard elbow and flue/terminal assembly (horizontal) and terminal assembly (vertical).

Twin Flue The total maximum equivalent flue length is 40m. 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: 45º bend 0.5 m

93º bend 1.0 m

Twin Flue Pipe: 45º bend (air duct) 1.3 m

45º bend (flue duct) 2.6 m 90º bend (air duct) 4.8 m 90º bend (flue duct) 9.6 m

Detailed examples of equivalent flue length calculation are given in the Installation Guidance Notes for each flue system type. (Documents 243501 and 243502 for concentric and twin pipe respectively).

A - Standard Flue

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