Dimplex System 18, System 30, Combi 24, Combi 38 Installation And Servicing Instructions

SSyysstteemm 1188
SSyysstteemm 3300

System Condensing Boilers

Installation and
Servicing Instructions

These instructions should be left with the user

© Dimple

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GGAASS CCOOUUNNCCIILL NNUUMMBBEERRSS

NNaattuurraall GGaass

Dimplex System 18 - Gas Council Appliance No:

4411 114499 0022

Dimplex System 30 - Gas Council Appliance No:

4411 114499 0011

22

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APPROVED PRODUCT

CCOONNTTEENNTTSS

SSEECCTTIIOONN DDEESSCCRRIIPPTTIIOONN PPAAGGEE

1.0 Introduction 4

2.0 Boiler Layout 7

3.0 Boiler Operation 8

4.0 Technical Data 9

5.0 Dimensions 10

6.0

System Details 11

7.0 Site Requirements 13

8.0 Flue options 17

9.0 Installation 20

10.0 Commissioning 24

11.0 Service Mode 26

12.0 Servicing & Maintenance 27

13.0 Changing Components 30

14.0 Electrical 38

15.0 Spare Parts 39

16.0 Fault Finding 40

17.0 Benchmark 42

18.0 Warranty Terms & Conditions 46

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11..00 IINNTTRROODDUUCCTTIIOONN

11..11 BBUUIILLDDIINNGG RREEGGUULLAATTIIOONNSS AANNDD BBEENNCCHHMMAARRKK CCHHEECCKKLLIISSTT

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.

CORGI operates a Self Certification Scheme for gas heating
appliances.

With the introduction of Self Certification Schemes, the
Benchmark L

ogbook is being withdrawn.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.

This company 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
serv

icing of all central heating systems to ensure safety and

efficiency.

Building Regulations require that installations should comply
with manufacturer’s instructions. It is therefore important that
the commissioning checklist is completed by the installer. The
relevant section of Building Regulations only relates to
dwellings. Therefore the checklist only applies if the appliance
is being installed in a dwelling or some related structure.

44

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11..22 IINNSSTTAALLLLAATTIIOONN,, CCOOMMMMIISSSSIIOONNIINNGG,, SSEERRVVIICCEE && RREEPPAAIIRR

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.

DDeeffiinniittiioonn ooff ccoommppeetteennccee::

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 “Domes

tic Gas Installations”

No modifications or changes can be made to this appliance
without prior written permission from Dimplex Boilers.

The manufacturers instructions must not be taken as overriding
any statutory requirements. If in doubt contact Dimplex Boilers
on 0844 3711121.

WWaarrnniinngg --

Check the inf

ormation on the data plate is

compatible with local supply conditions.

All CORGI registered installers carry a CORGI identification card
and have a registration number. You can check your installer is
registered by telephoning 0870 4012300 or writing to:-

1 Elmwood
Chineham Business Park
Crockford Lane
Basingstoke
RG24 8WG

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

These appliances meet the requirements of;
Gas Appliance Directive 90/396/EEC
Efficiency of Hot Water Boilers Directive 92/42/EEC
Low Voltage Directive 92/42/EEC
Electromagnetic Compatibility Directive 92/31/EEC

Type test certified by:- Notified Body 0087 (Pin 87BT49).

P

roduct/Production certified by:

Notified Body 0086.

For GB/IE only

11..00 IINNTTRROODDUUCCTTIIOONN

11..33 LLEEGGIISSLLAATTIIOONN

TThhee aapppplliiaannccee iiss ssuuiittaabbllee oonnllyy ffoorr iinnssttaallllaattiioonn iinn GGBB aanndd IIEE aanndd
sshhoouulldd bbee iinnssttaalllleedd iinn aaccccoorrddaannccee wwiitthh tthhee rruulleess iinn ffoorrccee,, aanndd
oonnllyy uusseedd iinn aa ssuuiittaabbllyy vveennttiillaatteedd llooccaattiioonn..

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.

AAllll ssyysstteemmss mmuusstt bbee tthhoorroouugghhllyy fflluusshheedd aanndd ttrreeaatteedd wwiitthh
iinnhhiibbiittoorr ((sseeee sseeccttiioonn 66..22))..

CCooddeess ooff PPrraaccttiiccee -- rreeffeerr ttoo tthhee mmoosstt rreecceenntt vveerrssiioonn

IInn GGBB tthhee ffoolllloowwiinngg CCooddeess ooff PPrraaccttiiccee aappppllyy:

:

SSttaannddaarrd

d

SSccooppe

e

BS 7967 Carbon monoxide in dwellings and the

combustion performance of gas fired appliances

BS 7967-2 Guide for using electronic portable combustion

gas analysers in the measurement of carbon

monoxide and the determination of combustion

perf

ormance

BS 7967-3 Guide for responding to measurements obtained

from electronic portable combustion gas

analysers

BS 7967-4 Guide for using electronic portable combustion

gas analysers as part of the process of servicing

and maintenance of gas fired appliances

BS 6891 Gas installation

B

S 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

B

S 5440 P

art

1

Flues

B

S 5440 Part 2 Ventilation

BS 7074 Expansion vessels and ancillary equipment

for sealed water systems

B

S 7593

T

r

e

a

tment of water in domestic hot water

c

entral heating systems

IInn IIEE tthhee ffoolllloowwiinngg CCooddeess ooff PPrraaccttiiccee aappppllyy:

:

SSttaannddaarrd

d

SSccooppe

e

I.S. 813 Domestic Gas Installation

The

f

ollowing s

tandards give valuable additional information;

B

S 5546

Ins

t

all

a

tion of ho

t

wa

ter supplies for domestic

purposes

BS 5449 Forced circulation hot water systems

B

S 7074

Expans

ion v

es

sels and ancillary equipment

for sealed water systems

BS 7593 Treatment of water in domestic hot water

c

entral heating systems

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GGAASS LLEEAAKKSS
DDOO NNOOTT OOPPEERRAATTEE AANNYY EELLEECCTTRRIICCAALL SSWWIITTCCHHEESS,, OORR UUSSEE AA
NNAAKKEEDD FFLLAAMMEE.. TTUURRNN OOFFFF TTHHEE GGAASS SSUUPPPPLLYY.. VVEENNTTIILLAATTEE TTHHEE
AARREEAA BBYY OOPPEENNIINNGG DDOOOORRSS AANNDD WWIINNDDOOWWSS.. CCAALLLL OOUUTT YYOOUURR
LLOOCCAALL GGAASS SSUUPPPPLLIIEERR
TTEELL:: 00880000 111111 999999

CCoonnttrrooll ooff SSuubbssttaanncceess HHaazzaarrddoouuss ttoo HHeeaalltthh
Under Section 6 of the Health and Safety at Work Act 1974, it
is required to provide information on substances hazardous to
health.

The adhesives and sealants used in this appliance are cured and
give no known hazard in this state.

Insul

ation Pads - These can cause irritation to skin, eye and
respiratory tract. If you have a history of skin complaint you
may be susceptible to irritation. High dust levels are usual only
if the material is broken. Normal handling should not cause
discomfort, but follow normal good hygiene and wash your
hands before eating, drinking or going to the lavatory. If you do
suffer irritation to the eyes or severe irritation to the skin seek
medical attention.

GGaass aanndd EElleeccttrriicciittyy CCoonnssuummeerr CCoouunncciill ((EEnneerrggyywwaattcchh))
Energywatch is an independent organisation, which protects
the interests of gas users. If you need advice concerning
energy issues, they may be contacted on their consumer help
line number: 08459 060708, or via their website;
www.energywatch.org.uk.

This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities,
or

lack of experience and knowledge, unless they have been

gi

v

en supervision or instructions concerning use of the

ap

plianc

e by a person responsible for their safety. Children
should be supervised to ensure that they do not play with the
appliance.

11..00 IINNTTRROODDUUCCTTIIOONN

1. The appliances incorporate a microprocessor based, fully
modul

a

ting air/g

as r

atio control system with direct burner
ignition. This provides a modulated heat output, with internal
frost protection provided as standard. The heat exchanger is
cons

t

ruct

ed from stainless steel encased in high temperature

polymer.

A combined circulating pump, automatic air vent assembly,
pressure gauge, safety valve and system expansion vessel are
included.

Isolation valves are fitted to the service connections.

The boiler

has a pump o

ver run feature therefore the central
heating system must include either a proprietary automatic
bypass valve or a radiator must be fitted with lock shield
valves. A separate CH expansion vessel is not required if the
total CH system content is less than 84 litres. However one is
required for systems with volumes greater than 84 litres; refer
t

o section 6.5. It

i

s r

ecommended tha

t

a drain cock is fitted at

the lowest point in the system.

66

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11..55 DDEESSCCRRIIPPTTIIOONN

RF room thermostats etc, are available as optional extras,
howe

v

er

if an e

xternal control is fitted the hole in the fascia
must be covered using the fascia blanking panel supplied (Part
No. 300635)

2. The boiler is designed for use on Natural Gas (G20). A
natural gas to propane conversion kit is available for each
Dimplex System Boiler.

3. The boiler is suitable for use only on fully pumped sealed
heating systems.

4. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the inner
door panel. It is visible when the case front is removed. (Fig. 1)

5. The boiler model name and serial number are also shown on
the information label on the inside of the fascia. This is for
user reference.

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

7. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal telescopic flue
kit, part no. 956120.

8.

AAllll ssyysstteemmss mmuusstt bbee tthhoorroouugghhllyy fflluusshheedd aanndd ttrreeaatteedd wwiitthh

iinnhhiibbiittoorr ((sseeee sseeccttiioonn 66..22))..

11..66 OOPPTTIIOONNAALL EEXXTTRRAASS

• Boiler

• Wall fixing jig

• T

emplates & ‘Quick Fit’ Guide

• Literature Pack

• Plugs and screws

11..77 PPAACCKK CCOONNTTEENNTTSS

11..44 SSAAFFEE MMAANNUUAALL HHAANNDDLLIINNGG

1. The boiler should be handled and lifted by two people.
Wear appropriate Personal Protection Equipment e.g. protective
gloves, safety footwear etc.
Plan your route to minimise the number of turns needed to
handle/lift the boiler.

2. Where possible transport the boiler using a sack truck or
other suitable trolley. Try to avoid steps, wet or slippery
surfaces, unlit areas etc. and take special care on ladders/into
lofts.

3. When handling or lifting always use safe techniques - keep
your back straight, bend your knees. Don’t twist - move your
feet, avoid bending forwards and sideways and keep the load
as close to your body as possible.

4. Asses the risks associated with handling and lifting
according to the conditions on site. If in doubt seek advice
before proceeding. Health and Safety is the responsibility of
everyone.

22..00 BBOOIILLEERR LLAAYYOOUUTT

22..11 KKEEYY

1. Expansion Vessel

2. Automatic Air Vent

3. Circulation Pump

4. Drain Off Point

5. Pressure Relief Valve

6. Central Heating System Pressure Gauge

7. PCB

8. Control Box

9. Flexible condensate pipe assembly

10. Flame Sensing Electrode

11.

Spark Electrode

12. Primary Heat Exchanger

13. Fan Assembly

14.

Gas Valve & Swirl Plate Assembly

15. Reset Button

16. Central Heating Temperature Control

17.

Air / Gas Channel

18. Burner & Burner Door

19. Spark Generator

20. Data Badge

21. Flue Sample Point

22. Manual Air Vent

23. Burner On Light

24. Central Heating Mode Light

25.

Di

splay

26. Flue Thermistor

27. Thermal Fuse

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77

0

1

2

bar

3

4

0

1

2

bar

3

4

FFiigg.. 11

FFiigg.. 22

1

1

221

1

226

6

227

7

222

2

2

2

3

3

6

6

7

7

8

8

220

0

9

9

117

7

110

0

118

8

111

1

113

3

114

4

1155225

5

224

4

116

6

223

3

112

2

119

9

4

4

5

5

33..00 BBOOIILLEERR OOPPEERRAATTIIOONN

33..11 CCEENNTTRRAALL HHEEAATTIINNGG

1. With a demand for heating, the pump, circulates water
through the primary circuit.

2. Once the main burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
temperature sensors.

3. When the demand is satisfied the burner is extinguished and
a 5 minute delay occurs before the burner will re-light (anti­cycling), the pump continues to run for a period of 2 minutes
(Pump Overrun).

88

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33..22 FFRROOSSTT PPRROOTTEECCTTIIOONN MMOODDEE

1. Providing there is mains power supply to the appliance, the frost
protection mode is integral.
If the system temperature falls below 5°C then the boiler will fire on
its minimum se

tting until a flow temperature of 20°C is reached.
Further protection can be incorporated by using a system frost
thermostat.

33..33 PPUUMMPP PPRROOTTEECCTTIIOONN

1. The pump will automatically operate for 1 minute in every 24 hours
to prevent sticking.

Expansion

V

essel

P

rimary

Heat Exchanger

Burner &

Burner Flange

Primary Return

CH flow

Thermistor

CH return

Thermistor

Condensate

Trap

Pressure

Gauge

CH

Return

3 BAR

Pressure Relief

Valve

Pump &

Hydroblock

Automatic

Air

Vent

CH

Flow

Flue Products

M

anual

Bleed Valve

FFiigg.. 33

44..00 TTEECCHHNNIICCAALL DDAATTAA

44..11 PPEERRFFOORRMMAANNCCEE DDAATTAA

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99

AApppplliiaannccee CCllaassssiiffiiccaattiioonn CC1133,, CC3333,, CC5533,, BB223

3

SSyysstteemm 118

8

SSyysstteemm 330

0

Mode Rate
O

utput (non-condensing)(80-60°C) Max kW 18.1 29.8

Min kW 6.0 8.1

Output (condensing)(50-30°C) Max kW 19.7 32.5

Input Max Rate Net kW 18.4 30.4

G

ross kW 20.4 33.7

Input Min Rate Net kW 5.4 7.6

Gross kW 6.0 8.4

Gas Rate (after 10 min operation - hot) Max m

3

/h 1.95 3.2
Seasonal Efficiency % 90.3 90.3
S

easonal Efficiency (SEDBUK) Band “A” “A”
Nox Classification Class “5” “5”
Min System Pressure Bar 0.5 0.5
Max System Pressure Bar 2.5 2.5
Max Central Heating Flow Temperature °C 80 80
M

in Central Heating Flow Temperature °C 30 30

GGeenneerraall SSppeecciiffiiccaattiioonns

s

Max lift weight kg 33.6 39.6
Total water capacity Ltr 1.8 3.1
I

ntegral expansion vessel capacity Ltr 8 8
Maximum heating system water content using fitted expansion vessel, @ 0.75 bar Ltr 84 84
Electrical supply 240V 50Hz Fuse at 3A
Internal fuse T4H 4A 250V
Maximum power consumption W 100 125
IP Rating IPX4 IPX4
Flue gas temperature 80/60 °C 59 75
Flue gas temperature 50/30 °C 41 55

CO

2

value max rate (Nat Gas) (Case must be fitted when taking reading) % 8.8-9.2 8.8-9.2
CO2value min rate (Nat Gas) (Case must be fitted when taking reading) % 8.5-8.9 8.7-9.1
CO value max rate (Nat Gas) (Case must be fitted when taking reading) P.P.M 15-60 15-60
CO value min rate (Nat Gas) (Case must be fitted when taking reading) P.P.M 0-40 0-40

CO

2

value max rate (Propane) (Case must be fitted when taking reading) % 10.8-11.2 10.5-10.9

CO

2

value min rate (Propane) (Case must be fitted when taking reading) % 10.4-10.8 10.3-10.7
CO value max rate (Propane) (Case must be fitted when taking reading) P.P.M 80-160 80-160
CO value min rate (Propane) (Case must be fitted when taking reading) P.P.M 0-40 0-40

Gas Pressure - Natural Gas mbar 18-20 18-20
Gas P

r

es

sure - Propane mbar 37 37

CCoonnnneeccttiioonns

s

Gas 22 mm compression
CH flow 22 mm compression
CH return 22 mm compression
Pressure relief valve outlet 15 mm compression
Condensate Drain 21.5 - 22 mm plastic overflow pipe
PP..PP..MM == PPaarrttss PPeerr MMiilllliioon

n

55..00 DDIIMMEENNSSIIOONNSS

1100

© Dimple

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125mm 125mm

10mm

Condensate

Drain

CH Flow

(22mm)

Gas Inlet

(22mm)

CH Return

(22mm)

Tap Rail

446mm

264mm 182mm

7

96mm

1

50mm

94mm

333mm

148mm185mm

Tube Ø 100mm

FFiigg.. 44

FFiigg.. 55

66..00 SSYYSSTTEEMM DDEETTAAIILLSS

66..11 IINNFFOORRMMAATTIIOONN

1. The Dimplex System Boiler is a ‘Water Byelaws Scheme ­Approved Product’. Reference to the Water Research Council
publications, ‘Water fittings and materials directory’ and ‘Water
supply byelaws guide’ give full details of byelaws and the IRNs.

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1111

66..33 SSYYSSTTEEMM CCOONNTTRROOLL

1. It

i

s r

ecommended that external controls e.g. room
thermostat are fitted to further improve the operating
efficiency of the boiler and system.

66..22 HHEEAATTIINNGG CCIIRRCCUUIITT

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

Treatment of Water Circulating Systems

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

• Central heating 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 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.
Using, for example Betz-Dearborn Sentinel X300 or X400 or
Fernox Superfloc Universal Cleanser. They should be used
following the flushing agent manufacturer’s instructions.

• System additives - corrosion inhibitors and flushing
agents/descalers should comply to BS7593 requirements, e.g.
Betz-Dearborn Sentinel X300 and Fernox-Copal which should
be used following the inhibitor manufacturer’s instructions.

• It is important to check the inhibitor concentration after
installation, system modification and at every service in
ac

cor

dance with the manufacturer’s instructions. (Test kits are

available from inhibitor stockists.)

• F

or information or advice regarding any of the above contact

Technical Enquiries - Tel: [phone].

• If thermostatic radiator valves are fitted, a radiator must be
fitted with two lock shield valves or the system must include a
proprietary automatic bypass valve, to enable correct operation
of the pump o

v

er-run

f

acility.

66..00 SSYYSSTTEEMM DDEETTAAIILLSS

66..44 SSYYSSTTEEMM FFIILLLLIINNGG AANNDD PPRREESSSSUURRIISSIINNGG

1. A filling point connection on the central heating return
pipework must be provided for initial filling and pressurising
and subsequent topping up of the system.

A filling loop is provided loose with the boiler

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

3. Further details are given in;
for GB: Guidance G24.2 and recommendation R24.2 of the
Water Regulations Guide.
f

or IE: the current edition of I.S. 813 “Domestic Gas

Installations”.

4. The sealed primary circuits may be filled or topped up using
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.

1122

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66..55 EEXXPPAANNSSIIOONN VVEESSSSEELL

1. The appliance expansion vessel is pre-charged to 1 bar.
Therefore the minimum cold fill pressure is 2 bar. The vessel is
suitable for correct operation for system capacities up to 84
litres. For greater system capacities an additional expansion
vessel must be fitted.
For GB refer to BS 7074 Pt 1.
For IE, the current edition of I.S. 813 “Domestic Gas
Installations”.

66..66 PPRREESSSSUURREE RREELLIIEEFF VVAALLVVEE

1. The pressure relief valve is set at 3 bar, therefore all
pipew

ork,

fit

tings, etc. should be suitable for pressures in

excess of 3 bar and temperature greater than 100°C.

2. The pressure relief discharge pipe should be not less than
15mm diameter, run continuously downward, and discharge
outside the building, preferably over a drain. It should be
r

out

ed in such a manner

tha

t

no hazar

d occurs to occupants or
causes damage to wiring or electrical components. The end of
the pipe should terminate facing down and towards the wall.

NNOOTTEE:: BBooiilliinngg wwaatteerr//sstteeaamm ccoouulldd ddiisscchhaarrggee ffrroomm tthhee ppiippee,,
tthheerreeffoorree iitt sshhoouulldd bbee tteerrmmiinnaatteedd aawwaayy ffrroomm wwiinnddoowwss aanndd
ddoooorrss..

Mains

Supply

CH

Return

Pressure
Relief
Discharge
Pipe

Temporary

Loop

Stop

Valve

Stop

Valve

Double

Check

Valve

GasCH

Flow

Condensate

1

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

2

3

4

5

6

7

FLOW RATE Ltr/min

PUMP HEAD (mH

2

O)

System 18

System 30

AVAILABLE PUMP HEADS

FFiigg.. 88

FFiigg.. 77

Expansion Vessel

P

ressure

R

elief V

alve

Vessel charge and initial
sy

s

t

em pressure

Total water content of
system using 8 litres
capacity expansion
vessel supplied with
appliance

For systems having a
larger capacity multiply
the t

otal system capacity
in litres by this factor to
obtain the total minimum
expansion vessel capacity
required in litres

bar

litres

0.5960.75

84

0.093

1.0731.5

50

FFiigg.. 66

FFiigg.. 99

FFiigg.. 1100

NNOOTTEE:: DDoo nnoott uussee tthhee pprreessssuurree rreelliieeff vvaallvvee ttoo ddrraaiinn tthhee ssyysstteemm,, bbeeccaauussee ddiirrtt
aanndd ddeebbrriiss ccoouulldd pprreevveenntt tthhee vvaallvvee sseeaattiinngg ccoorrrreeccttllyy..

77..00 SSIITTEE RREEQQUUIIRREEMMEENNTTSS

77..11 LLOOCCAATTIIOONN

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 an unvented cupboard - see section

7.3).

2. If the boiler is fitted in a room containing a bath or shower
reference must be made to the relevant requirements.
In GB this is the current I.E.E. Wiring Regulations and Building
R

egulations.

In IE reference should be made to the current edition of I.S.
813 “Domestic Gas Installations” and current ETCI rules.
(Fig. 11 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.
The boiler is IPX4 rated and can be fitted in Zone 2 (Fig. 11).

3. 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).

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1133

77..22 CCLLEEAARRAANNCCEESS

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

2. These dimensions include the necessary clearance 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
f

r

ont face of the boiler.

Zone 2

Zone 2

Zone 1

Zone 0

Zone 3

Zone 3

Window Recess

Zone 2

Window

Recess

Zone 2

0.6 m 2.4 m

Zone 2 Zone 3

Zone 2Zone 1

Zone 0

Zone 3

Outside Zones

Ceiling

Window
Recess

Zone 2

3.0 m

2.25 m

0.6 m 2.4 m

285mm Wall

450mm Min

For Servicing

Purposes

5mm Min
In Operation

5mm Min

446mm

5mm Min

796mm

200mm

200mm

5mm Min

5mm Min

285mm Wall

285mm Wall

FFiigg.. 1111

FFiigg.. 1122

77..00 SSIITTEE RREEQQUUIIRREEMMEENNTTSS

77..33 VVEENNTTIILLAATTIIOONN OOFF CCOOMMPPAARRTTMMEENNTTSS

1. Where the appliance is installed in a cupboard or
compartment, no air vents are required.
Where an open flued system is used - Flue kit E (B23
classification) then an air vent communicating directly with
outside air must be provided in the same room or internal
space of the flue duct air inlet. Minimum free area:

System 18 = 88cm

2

System 30 = 159cm

2

In addition if an open flued system is used - Flue kit (B23
classification) and the boiler is fitted in a compartment, then
high and low le

vel ventilation is required.

BS 5440-2:2000 gives guidance on compartmental ventilation.

2. When the boiler is installed in a cupboard or compartment
and either flue kit A, B, C, D or F (Classification C13, C33, C53)
is used, then no compartmental ventilation is required.

1144

© Dimple

x Boiler

s 2008

77..44 GGAASS SSUUPPPPLLYY

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 (Fig. 13).

3. Ensure that the pipework from the meter to the appliance is
of adequate size, and the demands of any other gas appliance
in the property are taken into consideration. Do not use pipes
of a smaller diameter than the boiler gas connection (22mm).

4. For boilers connected to use LPG (propane), the inlet
pressure must be 37mbar.

NNOOTTEE::

The comple

ted installation should always be tested

for gas tightness

77..55 EELLEECCTTRRIICCAALL SSUUPPPPLLYY

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 t

o the cur

r

en

t

edition of the ET

GI rules.

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

NNOOTTEE::

The mains supply connection must allow complete
electrical isolation of the appliance and system controls
only.
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 sy

s

t

em con

t

rols only.
Any additional mains cable should comply fully with the
current I.E.E. wiring regulations.

FFiigg.. 1133

Gas Serv

ice

Cock

77..00 SSIITTEE RREEQQUUIIRREEMMEENNTTSS

77..66 CCOONNDDEENNSSAATTEE DDRRAAIINN

NNOOTTEE::

The appliance is fitted with a trap the depth of
which is >= 75mm, therefore no other traps are required in
the condensate run.

The condensation 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.

1. The condensate outlet will accept 21.5mm (3/4in) plastic
overflow pipe which should discharge internally into the
household drainage system, downstream of all other traps. if
this is not possible, discharge into an outside drain is
ac

ceptable.

2. Ensure the discharge of condensate complies with any
national or local regulations in force.
BBSS 66779988::22000000 && PPaarrtt HHII ooff tthhee BBuuiillddiinngg RReegguullaattiioonnss ggiivvee
ffuurrtthheerr gguuiiddaannccee..

3. Metal pipework is NOT suitable for use in condensate
discharge systems.

4. The pipe should be a minimum of 21.5mm diameter and
must be supported properly.

5.

IItt iiss aaddvviissaabbllee ttoo kkeeeepp tthhee ccoonnddeennssaattee ppiippee iinntteerrnnaall..

6.

EExxtteerrnnaall rruunnss ggrreeaatteerr tthhaann 33 mmeettrreess oorr rruunnss iinn ccoolldd aarreeaass

sshhoouulldd uussee 3322mmmm wwaassttee ppiippee aanndd bbee iinnssuullaatteedd..

7. If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an external
run.

8. In all cases discharge pipe must be installed to aid disposal
of the condensate.

9. 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.
Ex

amples ar

e shown of the

f

ollowing methods of terminations

(se

e figs. 14,15 & 16):
i) to an internal soil & vent pipe
ii) via and internal discharge branch (e.g. sink waste)
iii) to a drain or gully
i

v) to a purpose made soakaway

10. In e

x

ceptional circumstances, such as when a boiler is
installed in a basement without drainage, it may be necessary
t

o ins

t

all a condensate pump to carry condensate up to ground/

d

r

ain le

v

el. Such pr

oducts ar

e a

v

ail

able

from most plumbing
merchants. For help with selecting a condensate pump contact
Dimplex Boilers - Tel: [phone].

WWAARRNNIINNGG::

There must be no air breaks in the condensate

pipework or drainage system (see Fig. 17).

© Dimple

x Boiler

s 2008

1155

5

0

mm p

e

r me

tre

o

f p

ip

e

r

u

n

2.5° Minimum fall

4

50mm min

T

ermination to an internal soil and vent pipe

50mm per metre of pipe r

un

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.

50mm per metre of pipe r

un

2.5° Minimum fall

Termination to a purpose made soak-away

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

500mm min

NNOOTT AALLLLOOWWEEDD

TThheerree sshhoouulldd bbee

nnoo aaiirr ggaap

p

FFiigg.. 1144

FFiigg.. 1155

FFiigg.. 1177

FFiigg.. 1166