Ravenheat CSI 85 Guida utente

ELECTRONIC IGNITION - AUTOMATIC MODULATING BOILER

CONDENSING FANNED COMBI

CSI 85 - CSI 85T

WITHOUT TIMER

NATURAL GAS (G 20) (I

) G.C. N

47 581 19

LPG (G 30 - G 31) (I

) G.C. N

47 581 23

British Gas

Tested, certified and

service listed

Listed by The United Kingdom Water

Fitting Byelaws Scheme

WITH TIMER

NATURAL GAS (G 20) (I

) G.C. N

47 581 20

LPG (G 30 - G 31) (I

) G.C. N

47 581 24

INSTALLATION AND SERVICING INSTRUCTIONS

TO BE LEFT WITH USER

Technical and illustrative data are not binding and can be modified without prior notice.

The descriptions and illustrations in the present booklet are for guideline purposes only.

RAVENHEAT MANUFACTURING LTD., CHARTISTS WAY, MORLEY, LEEDS, LS27 9ET. -TELEPHONE (0113) 252 7007

CONDENSING SYSTEM INNOVATION AUTOMATIC MODULATING BOILER

FOR CENTRAL HEATING AND DOMESTIC HOT WATER

This new super high efficient turbo-modulating boiler is designed to meet domestic hot water and

central heating requirements at super high efficiency, unheard of only a few years ago.

POSITION

The appliance is extremely versatile as it can be fitted in almost any room. The appliance is room sealed,

there is no contact between combustion chamber and living accommodation. This guarantees maximum

safety and efficiency.. Indeed, our depression/combustion front cover has been designed to fit, achieving

maximum air tight seal using screw down fasteners at 15 cm. This should not hinder service of the appliance,

but does ensure maximum efficiency and safety - something which Ravenheat take great pride in.

Each boiler has been designed and manufactured in our modern plant to exacting IS0 9001 discipline,

all boilers carry full CE marking of approval. Technical sales and commercial service are available

throughout the UK. This product is guaranteed by Ravenheat Manufacturing, Chartists Way, Morley,

LEEDS, LS27 9ET. Telephone No (0113) 252 7007.

BASIC COMPONENTS - (See figure 1)

Guarantee is a full 12 months from date of purchase providing the appliance has been fitted in

accordance with these instructions and relevant codes of practice.

MAJOR COMPONENTS

Gas valve with flame modulator.

Variable head pump suitable for any type of central heating system.

Main burner with flame stabiliser designed to operate under all thermal conditions.

Primary heat exchanger constructed from copper.

Unique patented condensing heat exchanger for high thermal flue transfer gases to water.

Stainless steel plate heat exchanger for super high heat transfer to domestic hot water,

Highly reliable diverter valve with ethylene propylene diaphragm permitting primary flow

circulation in the boiler during domestic hot water supply.

Built in frost protection.

Printed circuit board designed to connect to room stat and/or timer/frost stat.

Aesthetically pleasing panels and controls.

On/Off ball valves for shutting off gas central heating and domestic hot water circuit.

Safety relief valve (for safety discharge).

Programmable 7 day module with digital display (optional model).

All front panel controls not often used have been hidden. This achieves simplicity of operation with easy

to clean panels.

NOTE: Due to the high efficiency of this boiler a plume of water vapour will form at the flue

terminal during operation.

COSHH - CONTROL OF SUBSTANCES HARMFUL TO HEALTH

IMPORTANT

This appliance contains materials that are indicated below.

It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is worn

when handling, where applicable, the pertinent parts that contain any materials that could be interpreted

as being injurious to health and safety.

WARNING When installing the appliance, care should be taken to avoid any possibility of injury when

handling sheet metal parts.

GENERAL INFORMATION:

GLUES AND SEALANTS - exercise caution - if these are still in liquid form.

INSULATION PADS, CERAMIC FIBRE - may be harmful if inhaled, may be irritating to skin, eyes, nose

and throat.

When handling keep dust generation to a minimum, avoid inhaling and contact with skin or eyes,

When disposing of the product keep dust generation to a minimum and ensure that parts are securely

wrapped.

When servicing avoid inhalation by using a vacuum cleaner or in conjunction with other tools.

After handling wash hands and other exposed parts.

RAVENHEAT use only high quality material for production of this product, in an effort to protect the

environment components should be re-cycled.

SECTIONS:

TABLE OF CONTENTS

INTRODUCTION

DESIGN PRINCIPLES AND

OPERATING SEQUENCE

TECHNICAL DATA

GENERAL REQUIREMENTS

INSTALLATION

COMMISSIONING

SERVICING INSTRUCTIONS

FAULT FINDING

ELECTRICAL SYSTEM DIAGRAM

EXPLODED PARTS DIAGRAM

LIST OF SPARE PARTS

PAGE:

8-9-10

GENERAL LAYOUT

Fig.1

KEY

1 - Heat exchanger

2 - Heat exchanger for D.H.W. water

3 - Burner

4 - Ignition pilot burner

6 - Condensing heat exchanger

7 - Ignition board

9 - ignition electrode

11 - Frame

12 - Modulating gas valve

15 - Heating control

16 - Hot water control

17 - D.H.W. sensor

18 - Water pressure switch (heating circuit)

22 - Overheat cut of thermostat

23 - Safety relief system

24 - Three way valve

26 - Auto air vent valve

28 - Pressure switch

29 - Circulation

pump

30 - Water pressure gauge

33 - Main Switch

34 - C.H. sensor

35 - Condensing trap

36 - Fan

37 - Expansion tank

38 - Sealed chamber

45 - Combustion chamber

50 - Flue gas exhaust hood

105 - Timer

106 - Flue restriction ring

KEY

1 - Heat exchanger

2 - Heat exchanger for D.H.W. water

3 - Burner

4 - Ignition pilot burner

5 - Flue restriction ring

6 - Condensing heat exchanger

7 - Electronic ignition

8 - Condensing Trap

9 - Ignition electrode

10 - Condensate sensor

12 - Modulating gas valve 26 Auto air vent valve

15 - Heating control potentiometer

16 - Hot water control potentiometer

27 Pressure switch giving priority

28 - Pressure switch

17 - Water pressure switch

18 - Overheat cut-off thermostat

29 - Circulating pump

20 - Gas service cock

30 - Water pressure gauge

36 - Fan

21 - Compression ball valves

23 - Safety relief system

24 - Three way valve

25 - Flow regulator

37 - Expansion tank

38 - Sealed chamber

SECTION

1 INTRODUCTION

2.2.6 Central heating mode

1.1

The Ravenheat boiler is for the use of 2.2.7 If the switch is positioned on with a

central and domestic hot water combined in

‘demand for heat to supply radiators, etc., with

one unit. heating circuit fully charged so as to operate

It is fitted with an automatic domestic hot the low water sensor device the boiler will

water priority valve. start in the same way as domestic hot water

A (winter/summer) selector mode but with slightly differing time delay in

switch is fitted to the left hand side of control

that it will start on minimum and remain at this

panel. With the only (summer) position

level for about 1 minute, after which the flame

being for domestic hot water. will lift to its maximum setting as governed by

position being for central heating

a potentiometer range rates the heating circuit

with domestic hot water priority. The boiler

between maximum and minimum power.

is equipped with a front cover which can be

removed for servicing. The data badge with 2.2.6 On the control panel are mounted two

technical data is placed on the lower right

hand side of the frame.

potentiometers (thermostats) these control

the temperature. One is for domestic hot

water and the other for heating.

1.2

Fig. 1 Illustrates the general layout of

components. 2.2.9 The boiler is fitted with an anti-cycling

Fig. 2 Illustrates the operating principles device on the control board. This delays the

described in section 2. boiler from re-firing over a 2.5 minute period

when in heating mode. The domestic hot

SECTION 2

water will always take priority and is

unaffected by the anti-cycling device.

2.1

DESCRIPTION OF CONTROL SYSTEM

AND SEQUENCE OF OPERATION GENERAL FUNCTION

2.2 Domestic hot water mode 2.3 Central Heating Mode

When the appliance is in rest mode with the

mains neon and switch on. Switch the summer/

2.3.1

A potentiometer installed on the electric

winter switch tap position, with the heating circuit board permits regulation of the boiler

circuit charged with water (above 1 bar). If the

to partial heating requirements, between

domestic hot water tap is turned on, the boiler

maximum and minimum settings.

will function in the following sequence:

2.3.2 Air is drawn by the fan for combustion.

2.2.1

The pump starts.

The control board sensors. 2.3.3 The fan also forces exhaust gas through the

The fan operates via the pressure switch flue to the outside, this creates a lesser

and sends a signal back to the ignition board pressure in the sealed combustion

that the fan is running at maximum speed. chamber, thus sucking in combustion air,

through the inlet duct.

2.2.2 The spark ignition system is powered which

in turn commences the spark igniter to 2.3.4

The boiler water temperature is automatically

operate and light the burner.

controlled by a built in thermostat.

At this point the ignition board opens the first

step of the gas valve to light the pilot/burner. 2.3.5 Interior space temperature is set by the

2.2.3

room thermostat to be installed in the

When the electrode/sensor senses the heating system. The boiler already carries

signal of the pilot/burner, it opens the second connection terminals for this thermostat, as

stage of the gas valve via the ignition board well as for a timeclock. The burner

on minimum power. Upon the second valve continues to operate until it is stopped by

opening the spark igniter stops. the timer or one of the thermostats.

2.2.4 From the minimum gas rate setting the boiler 2.3.6 When the internal C.H. temperature sensor

increases to the maximum permissible intervenes the main burner shuts down. The

pressure over a period of 3 to 4 seconds and

fan stops but the pump continues to operate.

will remain at its maximum required power

until its maximum regulated temperature.

2.3.7 When the room thermostats intervene the

main burner shuts down. The fan stops and

2.2.5 When the domestic hot water tap is closed the pump turns off.

the diverter valve goes back into rest mode,

the main burner is shut down along with the 2.3.6 The condensate trap is fitted with a

pilot/burner. The pump and fan are also blockage safety sensor. This prevents the

switched off, the pressure switch returning boiler operating should there be a blockage

to its rest mode. in the condensate discharge trap.

2.4

2.4.1

2.4.2

2.4.3

Domestic hot water mode 2.4.4

The heat exchanger in the D.H.W. circuit is

built into the main heat exchanger, and do-

mestic water is heated by converting the wa-

ter in the central heating circuit. The trans-

ference of heat is very high because the two

fluids move in a counter direction flow to

each other.

Switch 33 in the (winter) position,

When a hot water tap is turned on a di-

aphragm diverter valve excludes the central

heating circuit, the boiler automatically mod-

ulates to maintain the domestic hot water at

a constant temperature.

Water temperature can be regulated using

the D.H.W. thermostat located on the front

control panel.

When domestic hot water is being drawn the

main burner and pump perform as they do

during central heating except that the burner

is commanded by the D.H.W. thermostat.

2.4.5

3.1

OVERALL DIMENSION

3.1.2

When D.H.W. is no longer called for the boil-

er automatically returns to the central heat-

ing mode.

Switch 33 in the (summer) position. The

boiler functions like an automatic gas hot

water heater. When D.H.W. is no longer re-

quired the main burner fan and pump imme-

diately turn off.

This also takes place when switch 33 is on

(winter) if there is no demand for

heat to the central heating system or until

the room thermostat/time clock demands for

central heating circuit.

SAFETY DEVICE

In both central heating and domestic hot

water mode safe operating is ensured by:

- A differential pressure switch shuts off the

main burner if the fan stops or the flue or

combustion air intake duct is obstructed.

An overheat cut off thermostat set slightly

higher than the high limit thermostat acts to

turn off the burner to resetable “lockout”

(Fig. 50) 3.

3.1.3 A safety valve is fitted on

the central heating circuit

set at 43 psi (3 bar).

3.2.1

A heating circuit (low water)

pressure switch is set at 0.4

bar.

SECTION

3 TECHNICAL DATA

TABLE 1

NATURAL GAS (G 20) I2H

NOMINAL HEAT INPUT NET 24.0 kW (84,500 Btu/h)

MINIMUM HEAT INPUT NET

13.0 kW (44.500 Btu/h)

NOMINAL HEAT OUTPUT 23.8 kW (81,200 Btu/h)

NOMINAL HEAT OUTPUT CONDENSING 25.6 kW (87,200 Btu/h)

MINIMUM HEAT OUTPUT

11.7 kW

(40,100 Btu/h)

MINIMUM HEAT OUTPUT CONDENSING

13.4 kW

(45,700 Btu/h)

GAS RATE max 2.5 m

S/h (88.25 ft

/h)

AFTER 10 MINUTES

min

1.3 m3S/h (45.9 ft3/h)

INLET PRESSURE 20 mbar (8.0 in w.g.)

BURNER PRESSURE C.H. max 10.5 mbar

(4.2 in w.g.)

min

2.0 mbar (0.8 in w.g.)

MAIN BURNER INJECTORS Nr. 13 x 1.25

PILOT BURNER INJECTOR 0.27 x 2 HOLES

ELECTRICAL SUPPLY 230V-50HZ

POWER CONSUMPTION 160W

EXTERNAL FUSE RATING

INTERNAL FUSE 315mA-2A-4A (20 mm to BS 4265)

DRY WEIGHT 51 kg

WATER CONTENT C.H.

2.1 litre

WATER CONTENT

0.5 litre

GAS SUPPLY CONNECTION

112" RC

FLOW CONNECTION C.H. 22 mm compression isolating valve

RETURN CONNECTION C.H. 22 mm compression isolating valve

INLET CONNECTION D.H.W. 15 mm compression isolating valve

OUTLET CONNECTION D.H.W. 15 mm copper pipe

SAFETY DISCHARGE C.H. 15 mm copper pipe

CONDENSATION DRAIN 3/4" (21.5 mm) push fit over flow

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE

SEALED WATER SYSTEM C.H.

MAX PRESSURE PHS 2.5 bar

(35.6 p.s.i.)

MINIMUM WORKING PRESSURE 0.5 bar (7.35 p.s.i.)

8 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar (7.35 psi.)

CENTRAL HEATING OPERATING TEMPERATURE MAX 85 oC

MIN 45oC

DESIGN FLOW RATE 1073 I/h (236 gals/h) 20 oC RISE

MINIMUM FLOW RATE C.H. 503 l/h (111 gals/h)

D.H.W. FLOW RATE 30 oC rise 12.2 l/min (2.7 gals/min)

D.H.W. FLOW RATE 35 oC rise 10.3 l/min (2.3 gals/min)

D.H.W. FLOW RATE 40

C rise

9.0 l/min (2.0 gals/min) 10 oC inlet temperature

D.H.W. TEMPERATURE

max 65 oC min 35 oC

BURNER PRESSURE D.H.W. max 11,2 mbar (4.5 in w.g.) min 2.0 mbar (0.8 in w.g.)

QMw Input Net

max 26 kW (88,600 Btu/h) min 13 kW (44,500 Btu/h)

D.H.W. PRESSURE

max 10 bar (147 p.s.i.)

D.H.W. PRESSURE PMW min 0.8 bar (11.8 p.s.i.) To obtain heat input 1.2 bar (17.1 p.s.i.)

D.H.W. MINIMUM FLOW RATE 3 l/min (0.66 gals/min)

FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers

DESTINATION: AT. CH. DK. ES. FI. GB. IE. IT. PT. SE.

FLUE TYPE - C

- C

Nox 2

CATEGORY I2H

SECTION

3 TECHNICAL DATA

TABLE 1/A

LPG (G 30 - G 31) I

NOMINAL HEAT INPUT NET

MINIMUM HEAT INPUT NET

NOMINAL HEAT OUTPUT

NOMINAL HEAT OUTPUT CONDENSING

24.8 kW

13.0 kW

24.1 kW

25.6 kW

(84,500 Btu/h)

(44,500 Btu/h)

(82,100 Btu/h)

(87,200 Btu/h)

MINIMUM HEAT OUTPUT

11.7 kW (4O,1OO Btu/h

MINIMUM HEAT OUTPUT CONDENSING

13.4 kW

(45,700 Btu/h)

GAS RATE max

G 31

0.95 m

S/h (33.53 ft/

G 30 0.79 m3/h (27.89 ft3/h)

AFTER 10 MINUTES

min

0.5 m3S/h (17.65 ft3/h) 0.4 m3/h (14.12 ft3/h)

INLET PRESSURE 37 mbar G 31 28 - 30 mbar

G 30

BURNER max

G 31

35.4 mbar (14.0 in wg.)

G 30

27.3 mbar (10.9 in wg.)

PRESSURE

min

7.3 mbar (2.92 in wg.) 7.0 mbar (2.8 in wg.)

MAIN BURNER INJECTORS Nr. 13 x 0.75

PILOT INJECTOR

0.22 x 1 HOLE

ELECTRICAL SUPPLY 230V-50HZ

POWER CONSUMPTION

16OW

EXTERNAL FUSE RATING

INTERNAL FUSE 315mA-2A-4A

DRY WEIGHT 51 kg

(20 mm to BS 4265)

WATER CONTENT C.H.

2.1 litre

WATER CONTENT

0.5 litre

GAS SUPPLY CONNECTION

FLOW CONNECTION C.H.

RETURN CONNECTION C.H.

INLET CONNECTION D.H.W.

OUTLET CONNECTION D.H.W.

112” RC

22 mm compression isolating valve

15 mm compression isolating valve

15 mm copper pipe

SAFETY DISCHARGE C.H. 15 mm copper pipe

CONDENSATION DRAIN 3/4" (21.5 mm) push fit over flow

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 litres

SEALED WATER SYSTEM C.H.

MAX PRESSURE PMS 2.5 bar

MINIMUM WORKING PRESSURE 0.5 bar

8 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar

CENTRAL HEATING OPERATING TEMPERATURE MAX 85 oC

(35.6 p.s.i.)

(7.35 p.s.i.)

MIN 45°C

DESIGN FLOW RATE 1023 l/h (225 gals/h) 20 oC RISE

MINIMUM FLOW RATE C.H./503 Lts/h (111 gals/h)

D.H.W. FLOW RATE 30 oC rise D 11.7 l/min (2.6 gals/min)

D.H.W. FLOW RATE 35

C rise

9.9 I/min (2.2 gals/min)

D.H.W. FLOW RATE 40

C rise

8.7 I/min (1.9 gals/min) 10 oC inlet temperature

D.H.W. TEMPERATURE

max 65 oC

min 35 oC

D.H.W. PRESSURE

max 10 bar (147 p.s.i.)

D.H.W. PRESSURE PMW min 0.8 bar (11.8 p.s.i.)

D.H.W. MINIMUM FLOW RATE 3 I/min (0.66 gals/min)

To obtain heat input 1.2 bar (17.1 p.s.i.)

FLUE OUTLET NOM. DIAM

DESTINATI

ETER 100 mm specially supplied with boilers

ON: BE. CH. ES. FR. GB. IE. IT. PT.

FLUE TYPE - C

- C

CATEGORY I3+ NOX 2

SECTION 4 GENERAL REQUIREMENTS

4.0

SAFETY

Gas Safety (Installation and Use).

Regulations, 1994 and amended 2000.

It is law that all gas appliances are installed

and serviced by a CORGI registered in-

staller in accordance with the above regula-

tions and these installation instructions. All

CORGI registered installers carry a CORGI

I.D. card and have a registration number.

Both should be recorded in your boiler log

book. You can check your installer by calling

CORGI direct on: 01256 732300. Failure to

install appliances correctly could lead to

prosecution. It is in your own interest, and

that of safety, to ensure the law is complied

with. Check the boiler and flue is the correct

type for installation.

The installation of the boiler MUST be in ac-

cordance with the latest I.E.E. (BS 7671)

Wiring Regulations, local building regula-

tions, bye-laws of the local water authority,

the building regulations and the Building

Standards (Scotland) and any relevant re-

quirements of the local authority.

4.1

GENERAL INFORMATION

Both the user and the manufacturer rely heavi-

ly on the installer, whose job it is to install the

combination boiler and connect it to a correctly

designed heating system. Acquaint yourself

with the British Standards concerning installa-

tion requirements. If you need advice on any

points your Ravenheat Technical Services Of-

fice would be pleased to help. It is recommend-

ed that tools suitable for brass fittings are used,

and have a capability to accomodate hexagon

sizes up to 50 mms.

CODES OF PRACTICE/Ref: Documents

Detailed recommendations are contained in

the following British Standard Codes of

Practice:

BS. 6891

Low pressure installation pipes.

BS. 6798

Installation of gas fired hot wa-

ter boilers of rated input not ex-

ceeding 60 kW.

BS. 5449

Forced circulation hot water

systems.

BS. 5546

Installation of gas hot water

supplies domestic purposes

(2nd Family Gases).

BS. 544O:1 Flues (for gas appliances of rated

input not exceeding 60 kW).

BS. 5440:2 Ventilation (for gas appliances of

rated input not exceeding 60 kW).

DD 189:1990 Discharge of condensate

Health & Safety Document No. 635

The Electricity at Work Regulations, 1989.

The manufacturer’s notes must NOT be tak-

en, in any way, as overriding statutory oblig-

ations

IMPORTANT. These appliances are CE cer-

tificated for safety and performance. It is,

therefore, important that no external control

devices e.g. flue dampers, economisers

etc., are directly connected to this appliance

unless covered by these Installation and

Service Instructions or as otherwise recom-

mended by Ravenheat in writing. If in doubt

please enquire.

Any direct connection of a control device not

approved by Ravenheat could invalidate the

certification and the normal appliance war-

ranty. It could also infringe the Gas Safety

regulations and the above regulations.

NOTE: The Ravenheat CSI combination

boiler has been tested and examined by BG,

and is certified to comply with PrEN 483 and

BS EN 625.

Manufacturers instructions must NOT be

taken in any way as overriding statutory

obligations.

If in doubt on any point please consult

Ravenheat Manufacturing Ltd.

4.2

LOCATION OF BOILER

4.2.1

Siting of Ravenheat CSI 85 Combi Boiler

must be as follows. The position of installa-

tion should be within the building, unless

otherwise protected by suitable enclosure.

Adequate space for installation, servicing

and air circulation around boiler must be al-

lowed for.

The Ravenheat CSI 85 Combi Boiler must

be fitted on a flat and vertical wall capable of

adequately supporting the weight of the boil-

er and any ancillary equipment.

The appliance may be installed on a com-

bustible wall subject to the requirements of

the Local Authority and Building Regula-

tions.

LPG versions of this appliance shall not

be installed in cellars or basements.

4.3

CLEARANCES AROUND THE APPLIANCE

4.3.1

The following minimum free spaces, re-

quired for installation inspection and servic-

ing, must be left around the boiler

18 inches (450 mm) in front

5 inches (125 mm) above

6 inches (150 mm) below

0.2 inches (5 mm) on each side

1 inch (25 mm) in front when installed in a

cupboard.

4.4

4.4.1

IMPORTANT NOTICE

4.5

4.5.1

If the combination boiler is to be fitted in a

timber framed building it should be fitted in

accordance with the British Gas Publication

Guide for Gas Installations in Timber Frame

Housing Reference DMZ. If in doubt advice

must be sought from the local gas supplier.

The combination boiler may be installed in

any room or internal space, although partic-

ular attention is drawn to the requirements

of the current I.E.E. Wiring Regulations, and

in Scotland the electrical provisions of the

Building Regulations applicable in Scotland,

with respect to the installation of the combi-

nation boiler in a room or internal space

containing a bath or shower,

Where a room sealed appliance is installed

in a room containing a bath or shower, any

electrical switch or appliance control, utilis-

ing mains electricity should be so situated

that it cannot be touched by a person using

a bath or shower.

A compartment used to enclose the combi-

nation boiler MUST be designed and con-

structed specifically for this purpose. An

existing cupboard, or compartment, may be

used provided it is modified accordingly.

Samples of the CSI combination boiler have

been examined by B.G. Technology Notified

Body, and is certified to comply with the

essential requirements of the Gas Appliance

Directive 90/396/EEC, the Low Voltage

Directive 72/23/EEC and shows compliance

with the Electro Magnetic Compatibility

Directive 89/336/EEC and are therefore per-

mitted to carry the CE Mark.

The appliance has been tested and

approved by the WRc as meeting the

requirements of G3 and L of the Building

regulations and water Bylaws Scheme -

Approved Products,

GAS SUPPLY

A gas meter is connected to the service pipe

by the Local Gas Region or the Local Gas

Region contractor. An existing meter should

be checked preferably by the Gas Region to

ensure that the meter is adequate to deal

with the rate of gas supply required for all

appliances it serves. Installation pipes

should be fitted in accordance with BS

6891. Pipework from the meter to the boiler

must be of adequate size (22 mm) min. To

within at least 3 metre of the boiler (15 mm)

min. can then be used for remaining pipe

work to the appliance. A smaller size than

the boiler inlet gas connection should not be

used. The complete installation must be

tested for soundness as described in the

above Code.

N.B. if the gas supply for the boiler serves

other appliances ensure an adequate sup-

ply is available both to the boiler and the

other appliances when they are in use at the

same time.

4.6 FLUE SYSTEM

4.6.1

The terminal should be located where dis-

persal of combustion products is not imped-

ed and with due regard for the damage or

discolouration that might occur to building

products in the vicinity (see fig. 6).

The terminal must not be located in a place

where it is likely to cause a nuisance.

In cold and/or humid weather water vapour

may condense on leaving the flue terminal.

The effect of such steaming must be consid-

ered.

The terminal must not be closer than 25

mm. (1 in) to any combustible material. For

protection of combustibles, refer to BS

5440.1.

Where a flue terminal is installed less than

1000 mm. from a plastic, or painted gutter;

or 500 mm from painted eaves. an alumini-

um shield 1000 mm. long, should be fitted to

the underside of the gutter or painted sur-

face.

Pluming will occur at the terminal so, where

possible, terminal positions which could

cause a nuisance should be avoided.

The flue must be installed in accordance with

the recommendations of BS 5440: Part 1.

Flue must be positioned in a place not like-

ly to cause a nuisance.

IMPORTANT: The following notes are

intended for general guidance.

The boiler MUST be installed so that the ter-

minal is exposed to external air.

It is important that the position of the termi-

nal allows the free passage of air across it at

all times.

Minimum acceptable spacing from the ter-

minal to obstructions and ventilation open-

ing are specified in Fig. 6.

Note positions: Due to the terminal

design,

installation is possible with clearances less

than those specified in ES 5440, Part 1.

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