Baxi 100 He Installation And Servicing Instructions

Baxi 100 HE

Wall Mounted Powered Flue Condensing Boiler

Gas Fired Central Heating Unit

Installation and Servicing Instructions

Please leave these instructions with the user

Baxi UK Limited 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 100 HE

G.C.No41 075 32

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.

For GB/IE only.

1.0 Introduction 4

2.0 General Layout 5

3.0 Appliance Operation 6

4.0 Technical Data 7

5.0 Dimensions and Fixings 8

6.0 System Details 9

7.0 Site Requirements 12

8.0 Installation 17

9.0 Electrical 23

10.0 Commissioning the Boiler 25

11.0 Fitting the Outer Case 26

12.0 Servicing the Boiler 27

13.0 Changing Components 29

14.0 Fault Finding 36

15.0 Short Parts List 44

Section Page

Contents

Baxi UK Limited declare that no substances harmful to health are contained in the appliance or used during appliance manufacture.

NOTE: This appliance must be installed in

accordance with the manufacturer’s instructions and the regulations in force, and only used in a suitably ventilated location.

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

Read the instructions fully before installing or using the appliance.

1.1 Description

1. The Baxi 100 HE is a gas fired room sealed fan assisted condensing central heating boiler.

2. The maximum output of the boiler is preset at 75,000 Btu/hr. The boiler will automatically adjust down to 30,000 Btu/hr according to the system load. If required, the output can be set to 100,000 Btu/hr. Please refer to section 8.8.

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

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

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

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

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

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

236921.

1.2 Important Information

This product contains Refractory Ceramic Fibres (R.C.F.) which are man-made vitreous silicate fibres. Excessive exposure to these materials may cause temporary irritation to eyes, skin and respiratory tract. Care must be taken when handling these articles to ensure the release of dust or fibres is kept to a minimum. To ensure that the release of fibres from these articles is kept to a minimum, during installation and servicing it is recommended that a H.E.P.A. filtered vacuum is used to remove any dust, soot or other debris accumulated in and around the appliance. This should be performed before and after working on the installation. It is recommended that any replaced item(s) are not broken up but sealed within heavy duty polythene bags and clearly labelled “R.C.F. waste”. This is not classified as “hazardous waste” and may be disposed of at a tipping site licensed for the disposal of industrial waste. Protective clothing is not required when handling these articles but it is recommended that gloves are worn and the normal hygiene rules of not smoking, eating or drinking in the work area are followed and always wash hands before eating or drinking.

1.0 Introduction

Fig. 1

H IG

L O

H I G

L O

Data Badge

Air Box Door

Lower Door Panel

Position of Label

Fig. 2

“Benchmark” Log Book

As part of the industry-wide “Benchmark” initiative all Baxi boilers now include an Installation, Commissioning and Service Record Log Book. Please read the Log Book carefully and complete all sections relevant to the appliance and installation. These include sections on the type of controls employed, flushing the system, burner operating pressure etc. The details of the Log Book will be required in the event of any warranty work. Also, there is a section to be completed at each subsequent regular sevice visit.

2.0 General Layout

2.1 Layout (Figs. 3,4 & 5)

1. Wall Plate

2. Flue Elbow

3. Heat Exchanger

4. Burner

5. Air Box

6. Fan Protection Thermostat

7. Fan Assembly

8. Condensate Trap

9. User Interface (optional timer available)

10. Gas Tap

11. Gas / Air Ratio Valve

12. Electronics Housing

13. Transformer

14. Flow Pipe Connection

15. Return Pipe Connection

16. Flow Temperature Safety Thermostat - Black

17. Flow Temperature Thermistor - Red

18. Flow Switch (dry fire protection)

I G

17 16

Fig. 4

Fig. 3

Fig. 5

2.2 Optional Extras

KIT PART N

FLUE EXTENSION KITS (110/70)

Flue Extension 0.25M 241692

Flue Extension 0.5M 241694

Flue Extension 1M

(Use two kits for 2M etc.) 241695

Flue Bend x 2 - 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 each bend)

241687

VERTICAL FLUE (110/70)

Vertical Flue Terminal 242802

Vertical Boiler Connection 242886

CONTROL ACCESSORIES

Integral Electronic Twin Channel Timer Kit 242834

3.0 Appliance Operation

3.1

1. Switched Live On: When the switched live switches on pump overrun occurs.

2. Pump Overrun: The pump is on while the fan, spark generator and gas valve are off. If at any stage during pump overrun the flow temperature is less than the set point and the flow switch is made then fan purge occurs. After 1 minute of pump overrun anti-cycle occurs.

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

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

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

6. Anti-cycle: The pump, fan, spark generator and gas valve are switched off. After 3 minutes pump overrun occurs.

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

Mains On.

Flow

temperature less

than set point and flow

switch made ?

YES

5 second

Fan Purge.

Flame Detected ?

Burner On.

Ignition

Lockout.

5 second

Ignition Period.

All TRVs

shut down ?

Flow temperature

greater than set

point ?

Ignition done and

5 attempts made ?

Ignition done

and less than 5

attempts made ?

Pump Overrun

Anti-cycle.

Pump Overrun

for 1 minute ?

YES

Appliance Category CAT I

4.0 Technical Data

Horizontal Flue Terminal Diameter 110mm Dimensions Projection 150mm

Outercase Dimensions

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

Weights kg lb Packaged Boiler Carton 40.7 89.6 Packaged Flue Kit 3.6 8.0 Weight Empty 38.2 84.1 Installation Lift Weight 31.5 69.3

Connections

Gas Supply -1/2in BSPT Central Heating Flow - 28mm Central Heating Return - 28mm Condensate Drain - 1 in BSP

Recommended System Temperature Drop

Normal 11°C20°F Condensing 20°C36°F

Heat Input Max Min

(see note) kW 33.76 10.2

Btu/h 115,200 34,840

Heat Output

(Non Condensing 70° C Mean Water Temp)

Max Min

kW 30.18 9.14

Btu/h 102,980 31,180

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an earthed supply)

Power Consumption 80W

External Fuse Rating 3A

Internal Fuse Rating (BS 4265)

Fuse (2) 4 AT (Control Board) Fuse (3) 2 AT (Ignition Board)

Max Gas Rate (Natural Gas)

(After 10 Mins)

Btu/hr 102,980 75,000

m3/h 2.95 2.31

ft3/h 104.2 81.6

Inlet Pressure at Gas Valve (Natural Gas)

Min 18.1 mbar

Max 22.5 mbar

(see Section 10.1)

Injector (Natural Gas)

6.3mm Diameter

Clearances

(For unventilated compartments see Section 7.5)

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

0 10203040

100

120

140

160

180

200

220

Water Flow Rate (litres/min)

Pressure Drop (mbar)

0.8

1.7

2.5

3.3

4.2

5.0

5.8

6.6

7.5

8.3

9.1

Pressure Drop (in wg)

Hydraulic Resistance Chart

Appliance Type C

Nox Class 5

Heat Output

(Condensing 40° C Mean Water Temp)

Max Min

kW 32.61 10.1

Btu/h 111,280 34,520

Water Content

litres 2.6

pints 4.6

Static Head

max 30 metres (100 ft)

min 1 metre (3.25 ft)

Low Head 0.2m (8 in) min

System Detail

fully pumped open vented & sealed systems

Gas Connection

RC1/2(1/2in BSPT)

Controls

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

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

- see section 8.8.

The efficiency is 90.9%

This value is used in the UK Government’s

Standard Assessment Procedure (SAP) for

energy rating of dwellings. The test data from

which it has been calculated has been

certified by 0086.

SEDBUK Declaration For 100 HE

5.0 Dimensions and Fixings

DIMENSIONS

A 600mm

B 320mm

C 390mm

D 125mm Ø Min.

E 150mm

F 125mm

SIDE FLUE (left and right)

For every 1m of horizontal flue length, the clearance above the top of the flue elbow should be 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

360° Orientation

Tube Ø 110mm

3°

(1 in 20)

3°

(1 in 20)

Fig. 6

Fig. 7

6.0 System Details

6.1 Water Circulating Systems

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

The following conditions should be observed on all systems:

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

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

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

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

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

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

NOTE: Full TRV Systems (refer to section 6.4) Where all the radiators are controlled by TRV’s then pump protection will be required. This can be done by either of the options opposite (see Fig A & B). The option shown in Fig. A should only be

used on a full TRV system without a bypass. Fig. B shows a system with a bypass that must be capable of allowing a flow of at least 3 l/min.

6.2 Treatment of Water Circulating

Systems

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

• When 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 followng 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 the Baxi Helpline.

Boiler

No demand for hot water

Central heating load

All TRV’s shut down (boiler flow switch causes pump to stop)

Live feed to pump

Switch live from programmer, etc.

S/L N

P/F

Fig. A Wiring to the pump feed connection of boiler

Fig. B Providing a 3 l/min bypass

Boiler

No demand for hot water

Central heating load

All TRV’s shut down (pump continues around bypass)

Switch live from programmer, room stat, etc.

S/L junction

S/L N

P/F

3 l/min bypass

Boiler Connections

NOTE: This boiler does not require a bypass.

This boiler does not require a permanent live. These diagrams only refer to pump protection for fully TRV’d systems.

6.0 System Details

6.3 Pipework

1. The sizes of flow and return pipes from the boiler should be determined by normal methods, according to the requirements of the system. The connection to the boiler is 28mm (compression).

2. Due to space requirements within the boiler outercase, pipework should comprise of solder fittings.

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

4. In systems using non-metallic pipework it is necessary to use copper pipe for the boiler Flow and Return. The copper must extend at least 1 metre from the boiler and include any branches (Fig. 7a).

6.4 System Controls

1. For optimum operating conditions, the heating system into which the boiler is installed should include a control system.

2. Such a system will comprise of a timer control and separate room or cylinder thermostats as appropriate. (An integral twin channel programmer is available as an optional extra).

3. The boiler should be controlled so that it operates on demand only.

4. Operation of the system under control of the boiler thermostat & TRV’s only does not produce the best results.

6.5 Low Head Installation

1. Using a close couple arrangement the minimum head is as shown in the diagrams (Figs. 8 & 9) subject to the following conditions:

a) The pump being adjusted to give an 20

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

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

tee in a horizontal section of the flow pipe.

An alternative Low Head Installation (Fig. 10)

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

6.6 Thermal Stores

1. When the 100 HE is fitted in conjunction with a thermal store, jumper 2 must be removed from the Control PCB, see Fig. 32a Section 8.8.

Typical Low Head Installation

If Conditions Require, This System Possible

Alternative Low Head Installation

Boiler

500mm

45°

22mm Open Vent

1000mm

Min

150mm

Max

15mm Cold Feed

400mm

Min Head

Return

Pump

Flow

Boiler

500mm

45°

22mm Open Vent

400mm

Min Head

1000mm

Min

Automatic

Air Vent

15mm Cold Feed

150mm

Max

Return

Pump

Flow

Return

Pump

Flow

Boiler

200mm

Min

Air

Separator

22mm Feed & Vent Pipe

Fig. 8

Fig. 9

Fig. 10

Boiler

Flow

Return

Copper

0.5m

Copper

0.5m

Fig. 7a

6.0 System Details

6.7 Sealed Systems

(Fig. 11)

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

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

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

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

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

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

4. FILLING POINT - A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement / refilling. The filling method adopted must be in accordance with the Water Supply (Water Fittings) regulations and the Water Bylaws (Scotland). Your attention is drawn to: Paragraph 24 of Schedule 2 Section 8 of the publication Water Regulations Guide which gives recommendations and guidance on approved methods for filling sealed systems. The sealed primary circuits may be filled or replenished by means of a temporary connection between the primary circuit and a supply pipe provided the arrangement in accordance with Diagram R24.2a of the Water Regulations Guide. The temporary hose must be completely removed at both ends after use.

5. MAKE UP SYSTEM - A method of replacing water lost from the system should be provided either by means of a make up vessel of not more than 3 litres (5 pints) capacity, mounted above the highest point of the system, or by re-pressurisation of the system.

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

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

Safety

Valve

Pressure

Gauge

Pump

Filling

Point

Air

Vent

3 Litre Top Up Bottle (if required)

Radiator Circuit

Expansion Vessel

System Drains at Low Point

Max Boiler Flow

Temp = 82° C

Boiler

Fig. 11

Table. 1

Vessel Charge Pressure (Bar)

0.5

1.0

1.5

Initial System

Pressure (Bar)

0.5

1.0

1.5

2.0

1.0

1.5

2.0

1.5

2.0

Multiply Total

Water Content

Of System By

(Litres)

0.067

0.112

0.207

0.441

0.087

0.152

0.330

0.125

0.265

Method of determining minimum valve of

expansion vessel volume for sealed

systems using Baxi Boilers

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

Example :-

Then :-

NOTE

Where a vessel of the calculated size is not obtainable

then the next available larger size should be used.

Stop Valve

Double Check Valve

DHW Mains Inlet

CH Return

Temporary Hose

Stop Valve

Fig. 11a

7.0 Site Requirements

7.1 Information

WARNING - Check the information on the data

plate is compatible with local supply conditions.

1. The installation must be carried out by a CORGI Registered Installer or other registered competent person and be in accordance with the relevant requirements of the current G

AS SAFETY (Installation

and Use) R

EGULATIONS, the BUILDING REGULATIONS

(Scotland)(Consolidation), the LOCAL BUILDING REGULATIONS, the current I.E.E. WIRING REGULATIONS

and the bye laws of the LOCAL WATER UNDERTAKING. Where no specific instruction is given reference should be made to the relevant BRITISH STANDARD CODES OF PRACTICE. For Ireland install in accordance with IS 813 “I

NSTALLATION OF

GAS APPLIANCES”. Reference should also be made to B

RITISH GAS GUIDANCE NOTES FOR THE

INSTALLATION OF DOMESTIC GAS CONDENSING BOILERS.

7.2 B.S. Codes of Practice

Standard Scope

BS 6891 Gas Installation. BS 5546 Installation of hot water supplies for

domestic purposes. BS 5449 Part 1 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.

WARNING - The addition of anything that may interfere with the normal operation of the appliance without the express written permission of Baxi UK Limited could invalidate the appliance warranty and infringe the G

AS SAFETY

(Installation and Use) REGULATIONS.

7.3 Clearances (Figs. 12 &13)

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

2. These dimensions include the necessary clearances around the boiler for case removal, spanner access and air movement. Additional clearances may be required for the passage of pipes around local obstructions such as joists running parallel to the front face of the boiler.

3. For unventilated compartments see Section 7.5.

7.4 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 7.5).

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

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

I.E.E. W

IRING REGULATIONS and BUILDING

REGULATIONS. If the boiler is to be fitted into a

building of timber frame construction then reference must be made to the Institute of Gas Engineers document UP 7.

50mm

600mm

390mm

200mm

5mm Min

5mm

500mm

For Servicing

Purposes

Fig. 12

Fig. 13

In Operation

3°

(1 in 20)

320mm

7.0 Site Requirements

7.5 Ventilation of Compartments

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

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

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

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

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

7.6 Gas Supply

1. The gas installation should be in accordance with BS6891.

2. The connection to the appliance is a

/2in BSPT internal threaded connection located at the rear of the gas service cock (Fig. 15).

3. Ensure that the pipework from the meter to the appliance is of adequate size. (22mm pipework must be connected to the appliance gas service cock. This should extend for at least 3 meters back towards the gas meter).

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

7.7 Electrical Supply

1. External wiring must be correctly earthed, polarised and in accordance with current I.E.E.

IRING REGULATIONS.

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.

7.8 Condensate Drain

NOTE: Ensure the discharge of condensate

complies with any national or local regulations in force.

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

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

2. The pipe should run internally as much as possible and with a 10° (1 in 6) fall to dispose of condensate quickly to avoid freezing.

H IG

L O

Gas Service Cock

Fig. 15

7.0 Site Requirements

J,K

D E

Likely flue positions requiring a flue terminal guard

J,K

7.9 Flue

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. Recommendations for flues are given in BS 5440 Pt.1.

2. If the terminal discharges onto a pathway or passageway, check that combustion products will not cause a nuisance and that the terminal will not obstruct the passageway.

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

4. Adjacent surfaces close to the flue terminal may need protection from the effects of condensation. Alternatively a flue deflector kit (part no. 248167) is available.

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

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

248167) must be fitted.

7. For fitting under low sofits 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.

8. 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. 17

Fig. 16

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. 2

Terminal Position with Minimum Distance (Fig. 17) (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

7.10 Flue Dimensions

See Section 1.2. The standard horizontal flue kit allows for flue lengths between 270mm (10

/8”) and 800mm (32”) from elbow to terminal (Fig. 18).

The maximum permissible equivalent flue length is: 4 metres (Fig. 18a).

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.

7.11 Terminal Guard (Fig. 19)

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

2. When ordering a terminal guard, quote the appliance model number.

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

7.12 Vertical Flue

1. Only a flue approved with the Baxi 100 HE can be used.

2. For information on vertical flues consult the Baxi High Efficiency Brochure or Notes for Guidance supplied with the vertical flue pack.

Fig. 18

Fig. 18a

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

Fig. 19

270mm

800mm

0.5m

+ 33 hidden pages

Baxi 100 He Installation And Servicing Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual