Baxi System 100 HE Plus Installation & Servicing Instructions Manual

Installation & Servicing Instructions

Baxi System 100 HE Plus

Wall Mounted Powered Flue Condensing

Gas Fired Central Heating Boiler

Please leave these instructions with the user

Natural Gas

Baxi System 100 HE Plus

G.C.No41 075 43

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Benchmark Logbook is being withdrawn.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.

Potterton is a member of the Benchmark initiative and fully

supports the aims of the programme. Its aim is to improve the

standards of installation and commissioning of central heating

systems in the UK and to encourage the regular servicing of all

central heating systems to ensure safety and efficiency.

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 0087.

Product/Production certified by:

Notified Body 0086.

For GB/IE only.

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.

This product has an energy rating (A) on a scale of A to G.

For more information see www.boilers.org.uk. This is a certification mark.

Baxi is a BS-EN ISO 9001

Accredited Company

Install and Commission this appliance to manufacturer's

instructions

Complete the

Benchmark Checklist

Choose Building

Regulations Notification

Route

Installer Notification Guidelines

Competent Person's

Self Certification Scheme

If you notify via CORGI Scheme,

CORGI will then notify the

relevant Local Authority

Building Control Scheme

on member's behalf

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

Building Control

Contact your relevant Local

Authority Building Control

(LABC) who will arrange

an inspection or contact a government approved

inspector

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

Legislation

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. For recommended

hand holds see section 8.4. 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.

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 6.2).

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

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

0870 4012300 or writing to:-

1 Elmwood,

Chineham Business Park,

Crockford Lane,

Basingstoke. RG24 8WG

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

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.

Contents

Section Page

1.0 Introduction 6

2.0 General Layout 7

3.0 Appliance Operation 8

4.0 Technical Data 9

5.0 Dimensions and Fixings 10

6.0 System Details 11

7.0 Site Requirements 14

8.0 Installation 20

9.0 Electrical 26

10.0 Commissioning 28

11.0 Outer Case 29

12.0 Servicing 30

13.0 Changing Components 32

14.0 Short Parts List 41

15.0 Fault Finding 42

Benchmark Checklist 50

Fig. 1

Lower Door Panel

Label

1.0 Introduction

1.1 Description

1. The Baxi System 100 HE Plus is a gas fired room sealed fan

assisted condensing central heating system 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 8.7.

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

4. The boiler is suitable for sealed central heating and

domestic hot water 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.

Air Box Door

Data Badge

Fig. 2

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

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 manmade mineral fibre care must be exercised.

• If any irritation of the eyes or severe irritation of the skin is experienced seek medical attention.

NOTE: All illustrations show the PCB Connection Cover removed unless otherwise shown.

2.0 General Layout

2.1 Layout (Figs. 3,4 & 5)

1. Wall Plate

2. Flue Elbow

3. Heat Exchanger

4. Burner

Fig. 6

5. Air Box

6. Fan Protection Thermostat

7. Fan Assembly

Fig. 5

13/14

8. Condensate Trap

9. Gas Tap

10. Gas / Air Ratio Valve

13. Flow Temperature Safety Thermostat - Black

14. Flow Temperature Thermistor - Red

15. Flow Switch (dry fire protection)

16. Circulation Pump

17. Manual Air Vent

18. Pressure Relief Valve

19. Water Pressure Gauge

20. Expansion Vessel

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

Flue Bend x 2 - 45°

Flue Bend - 90° (

Horizontal Extended Flue (1.75M) 5111457

VERTICAL FLUE (110/70)

Vertical Flue Terminal 242802

Vertical Flue Adaptor 5106888

VERTICAL FLUE (80/80)

Kit Boiler Connection Twin 242757

(Use two kits for 2M etc.) 241695

(Reduce overall length of flue

by 0.5m when fitting this bend)

Reduce overall length of flue

by 1m when fitting each bend)

241689

241687

Fig. 4

Fig. 3

3.0 Appliance Operation

Switched Live

to Boiler On.

Flow

temperature less

than set point ?

YES

10 second Pump On.

Flow switch made ?

YES

5 second

Fan Pre-Purge.

YES

Ignition done

and less than 5

attempts made ?

3.1

1. Switched Live To Boiler On: When the switched live

switches on if the flow temperature is less than the set

point then pump on occurs. When the switched live to

the boiler switches on if the flow temperature is greater

than the set point then pump overrun occurs.

2. Pump On: The pump is on while the fan, spark

generator and gas valve are off. After 10 seconds if the

flow switch has made then fan pre-purge occurs. After

10 seconds if the flow switch has not made then anti-

cycle occurs.

3. Fan Pre-Purge: The pump and fan are on while the

spark generator and gas valve are off. After 5 seconds

ignition occurs.

4. Ignition: The pump, fan, spark generator and gas

valve are on. If a flame is detected then burner on

occurs. If a flame is not detected within 5 seconds and

less than 5 ignition attempts have been made then fan

purge occurs. If a flame is not detected within 5 seconds

and 5 ignition attempts have been made then ignition

lockout occurs.

5 second

Ignition Period.

Flame Detected ?

YES

Burner On.

Ignition done and 5 attempts made ?

YES

Ignition

Lockout.

All TRVs

shut down ?

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. Pump Overrun: The pump is on while the fan, spark

generator and gas valve are off. After 1 minute anti-

cycle occurs.

7. Anti-cycle: The pump, fan, spark generator and gas

valve are off. After 3 minutes if the flow temperature is

less than the set point then pump on occurs. After 3

minutes if the flow temperature is greater than the set

point then pump overrun occurs.

8. Ignition Lockout: The pump, fan, spark generator and

gas valve are off. The boiler can only be reset by

manually using the reset button.

1 minute

Pump Overrun.

3 minute

Anti-cycle.

YES

4.0 Technical Data

Appliance Type C

Appliance Category CAT I

Heat Input Gross Max Min

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

Heat Output

(Condensing 40° C Mean Water Temp)

Max Min

kW 32.61 10.1

Btu/h 111,280 34,520

Max Gas Rate (Natural Gas)

(After 10 Mins)

Btu/hr 102,980 75,000

m3/h 2.95 2.36

ft3/h 104.2 83.3

Inlet Pressure (Natural Gas)

Min 18.1 mbar

Max 22.5 mbar

(see Section 10.1)

Injector (Natural Gas)

6.3mm Diameter

NoxClass 5

CO/CO2Ratio 0.001

Connections compression Gas Supply -

/2” BSPF Central Heating Flow - 22mm Central Heating Return - 22mm Pressure Relief Discharge - 15mm

Condensate Drain - 1” BSP

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption 200W

External Fuse Rating 3A

Outercase Dimensions

Overall Height Casing Height - 850mm Casing Width - 490mm Casing Depth - 320mm

Clearances

(For unventilated compartments see Section 7.2)

Both Sides 5mm Min

Inc Flue Elbow - 1000mm

Internal Fuse Rating (BS 4265)

Fuse 3.15 AT (PCB)

Electrical Protection IPX2

Water Content

litres 3.5

pints 6.2

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

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

bar lb/in

Min Pre-charge Pressure 0.95 13.6

Weights kg lb Packaged Boiler Carton 53.6 118 Packaged Flue Kit 3.6 8.0 Weight Empty 48.6 107 Installation Lift Weight 40.2 88.6

Recommended System Temperature Drop

Condensing 20°C 36°F

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

Nominal Pre-charge Pressure 1 14.5

litre gal Max Capacity of CH System 125 27.5

Controls

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

Horizontal Flue Terminal Diameter 110mm Dimensions Projection 150mm

Recommend Operating 1-2 14.5-29

SEDBUK Declaration For Baxi System 100 HE Plus

The seasonal efficiency (SEDBUK) 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 have been certified by 0086.

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 8.7.

Central Heating Circuit available Pump Head

600

500

400

300

Pump Head (mbar)

200

100

120 240 360 480

0 600 720 840

Flow Rate (l/h)

5.0 Dimensions and Fixings

DIMENSIONS

3°

(1 in 20)

A 850mm

B 320mm

C 490mm

D 125mm Ø Min.

E 150mm

F 125mm

360° Orientation

The 3° (1 in 20) fall provided by the elbow is to allow condensate to run back to the boiler, for disposal

Tube Ø 110mm

through the condensate discharge pipe.

Fig. 7

Fig. 8

SIDE FLUE (left and right)

3°

(1 in 20)

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.

Flue length (Y)

up to 1m

1m - 2m

2m - 3m

Clearance (X)

55mm

110mm

165mm

6.0 System Details

6.1 Water Circulating Systems

Switch live from programmer, etc.

S/L

Filter

Optional

Pump

S/L

Boiler Connections

Fig. A Wiring an extra pump to the pump feed

connection of boiler

Boiler

Feed

Live feed to pump

Hot water

Central heating load

1. The appliance is suitable for fully pumped sealed systems only.

The following conditions should be observed on all systems:

• 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.

• Air vents should be fitted to all system high points.

• An air rejection separator is recommended to ensure correct operation of all appliance components.

2. If the system requires an output from the boiler greater than 75,000 Btu/hr then an additional external pump will need to be fitted.

3. If the system is fully TRV’d with no bypass then any external pump can be wired back to the boiler Optional Pump Feed connection. This will protect the pump by turning it off if all the TRVs are shut (sensed by the boiler flow switch). This is wired as in Fig. A. See section 8.7 for how to increase boiler output from 75.000 Btu/hr to 100,000 Btu/hr.

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 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 the

Baxi Helpline.

Timer

CH on HW on HW off

L N

230V 50Hz

L NE

g/y

Room

Stat

Cylinder

Stat

Y Plan

Diverter

Valve

Key to colours

b - Blue

br - Brown

w - White

o - Orange

gr - Grey

g/y - Green/Yellow

6.0 System Details

6.3 System Controls

This boiler does not require a bypass. This boiler does not require a permanent live. An additional external pump is required if a boiler output of greater than 75,000 Btu/hr is required. The additional external pump only needs wiring directly to the boiler for fully TRV’d systems.

1. To comply with Part L1 of the Building Regulations the

heating system into which the boiler is installed should

include the following:

Pump

LNE

Electrical

Filter

Y Plan, Room Thermostat System, CH Interlocked By Room Thermostat

At least the Radiator(s) near the Room Thermostat not TRV’d Pump run from Switched Live By-pass permitted but not required for Part L1 compliance

230V 50Hz

L NE

Motor

S Plan

Valve

g/y

Room

Stat

Cylinder

Stat

Motor

S Plan

g/y

Valve

Timer

Electrical

Filter

CH on

HW on

L N

LNE

Pump

S Plan, Room Thermostat System, CH Interlocked By Room Thermostat

At least the Radiator(s) near the Room Thermostat not TRV’d Pump run from Switched Live By-pass permitted but not required for Part L1 compliance

230V 50Hz

L NE

g/y

Cylinder

Stat

Y Plan

Diverter

Valve

a) zone controls

b) timing controls

c) boiler control interlocks

2. Such a system needs to be fully pumped and must

provide independent temperature and time control to

both the heating and hot water circuits and have a boiler

interlock.

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

demand only. Where it is proposed to effect control by

thermostatic radiator valves, a room thermostat (or

other device such as a flow switch - a flow switch is

integral to this boiler) should also be provided to switch

off the boiler when there is no demand for heating or hot

water.

4. The interlock for the CH circuit can be provided by

either a Room Thermostat or by a fully TRV’d system

without a bypass. If an external pump is required and the

boiler flow switch is being used as the system interlock

then the additional pump will need to be wired back to

the boiler optional pump feed connection. Connection

diagrams for both options for Y and S plan systems are

shown.

230V 50Hz

L NE

Motor

S Plan

Valve

g/y

Cylinder

Motor

S Plan

g/y

Valve

Stat

Timer

CH on

HW on

HW off

LNE

Pump

Filter

Optional Pump Feed

Y Plan, Fully TRV’d System, CH Interlocked By Boiler Flow Switch

Room Thermostat should not be fitted Pump must be run from Boiler Optional Pump Feed connection for Part L1 compliance By-pass not permitted (must be valved off) for Part L1 compliance

Timer

CH on HW on

L N

LNE

Pump

Electrical

Filter

Optional Pump Feed

S Plan, Fully TRV’d System, CH Interlocked By Boiler Flow Switch

Room Thermostat should not be fitted Pump must be run from Boiler Optional Pump Feed connection for Part L1 compliance By-pass not permitted (must be valved off) for Part L1 compliance

Fig. 9

Boiler

Copper

0.5m

Copper

0.5m

Flow

Return

6.0 System Details

6.4 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

22mm compression fitting.

2. Due to space requirements at the rear of the tap bracket,

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. 9).

6.5 Thermal Stores

1. When the Baxi System 100 HE Plus is fitted in conjunction with a thermal store, both jumpers must be removed from the Control PCB, see Fig. 34 Section 8.7.

6.0 System Details

Cold Mains

Fig. 10

Expansion Vessel removed for clarity

Stop Valve

Double Check Valve

Temporary Hose

Stop Valve

CH Return

6.6 System Filling and Pressurising

(Fig. 10)

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 the Water Supply (Water Fittings) regulations and

the Water Bylaws (Scotland).

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 primary circuit and a supply pipe provided

the arrangement in accordance with Diagram R24.2a of

the Water Regulations Guide.

5. The temporary hose must be completely removed at

both ends after use.

Fig. 11

Expansion Vessel

Pressure Relief Valve

6.7 Expansion Vessel (Fig. 11)

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 (27.5 gal). For greater

system capacities an additional expansion vessel must be

fitted - refer to BS 7074 Pt 1.

6.8 Pressure Relief Valve (Fig. 11)

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. A

Zone 2

Zone 1

Zone 0

Window Recess

Zone 2

In GB Only

Window Recess

Zone 2

0.6 m

Zone 3

2.4 m

7.0 Site Requirements

7.1 Location

NOTE: Due to the high efficiency of the boiler a plume of water vapour will be discharged from the flue. This should be taken into account when siting the flue terminal.

1. The boiler may be fitted to any suitable wall with the flue

passing through an outside wall or roof and discharging to

atmosphere in a position permitting satisfactory removal of

combustion products and providing an adequate air supply.

The boiler should be fitted within the building unless

otherwise protected by a suitable enclosure i.e. garage or

outhouse. (The boiler may be fitted inside a cupboard - see

Section 7.2).

2. If the boiler is sited in an unheated enclosure then it is

recommended to incorporate in the system controls a

suitable device for frost protection.

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.

3.0 m

Zone 2

Zone 1

Zone 0

Fig. B

Zone 3

Zone 2

0.6 m

Window Recess Zone 2

In GB Only

Outside Zones

Zone 3

2.4 m

2.25 m

Ceiling

Outside Zones

4. If the boiler is to be fitted into a building of timber frame

construction then reference must be made to the current

edition of Institute of Gas Engineers Publication IGE/UP/7

(Gas Installations in Timber Framed Housing).

7.2 Ventilation of Compartments

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

Sides 25mm Top 200mm Bottom 200mm Front 100mm

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.

7.0 Site Requirements

5mm Min

490mm

5mm Min

200mm

850mm

200mm

7.3 Clearances (Figs. 13 &14)

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

boiler.

2. These dimensions include the necessary clearances around

the boiler for case removal, spanner access and air

movement. Additional clearances may be required for the

passage of pipes around local obstructions such as joists

running parallel to the front face of the boiler.

3. For unventilated compartments see Section 7.2.

7.4 Gas Supply

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

2. The connection to the appliance is

/2” BSPF.

3. Ensure that the pipework from the meter to the appliance is of adequate size. (22mm recommended at the appliance).

Do not use pipes of a smaller diameter than 22mm up to the boiler connection.

Fig. 13

500mm

For Servicing

Purposes

3°

(1 in 20)

7.5 Electrical Supply

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

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

NOTE: The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance. Connection may be via a fused double-pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only.

WARNING: The PCB Control and Fan Assembly is 325 Vdc. Isolate at supply before access.

Fig. 14

5mm

In Operation

320mm

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Baxi System 100 HE Plus Installation & Servicing Instructions Manual

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