Dimplex System 18 User guide

SSyysstteemm1188
SSyysstteemm3300
System Condensing Boilers
Installation and
Servicing Instructions
These instructions should be left with the user
© Dimplex Boilers 2008

GGAASSCCOOUUNNCCIILLNNUUMMBBEERRSS
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Dimplex System 18 - Gas Council Appliance No: 44111144990022
Dimplex System 30 - Gas Council Appliance No: 44111144990011
22© Dimplex Boilers 2008
APPROVED PRODUCT

CCOONNTTEENNTTSS
SSEECCTTIIOONNDDEESSCCRRIIPPTTIIOONNPPAAGGEE
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
© Dimplex Boilers 2008 33

11..00IINNTTRROODDUUCCTTIIOONN
11..11BBUUIILLDDIINNGGRREEGGUULLAATTIIOONNSSAANNDDBBEENNCCHHMMAARRKKCCHHEECCKKLLIISSTT
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Benchmark Logbook is being withdrawn.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.
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
servicing 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© Dimplex Boilers 2008
11..22IINNSSTTAALLLLAATTIIOONN,,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.
DDeeffiinniittiioonnooffccoommppeetteennccee::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”
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 information 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).
Product/Production certified by:
Notified Body 0086.
For GB/IE only

11..00IINNTTRROODDUUCCTTIIOONN
11..33LLEEGGIISSLLAATTIIOONN
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oonnllyyuusseeddiinnaassuuiittaabbllyyvveennttiillaatteeddllooccaattiioonn..
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.
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In nG GB Bt th he ef fo ol ll lo ow wi in ng gC Co od de es so of fP Pr ra ac ct ti ic ce ea ap pp pl ly y: :
S
St ta an nd da ar rd dS Sc co op pe 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
performance
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
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 1Flues
BS 5440 Part 2 Ventilation
BS 7074 Expansion vessels and ancillary equipment
for sealed water systems
BS 7593 T
reatment of water in domestic hot water
central heating systems
I
In nI IE Et th he ef fo ol ll lo ow wi in ng gC Co od de es so of fP Pr ra ac ct ti ic ce ea ap pp pl ly y: :
S
St ta an nd da ar rd dS Sc co op pe e
I.S. 813 Domestic Gas Installation
The following standards give valuable additional information;
BS 5546 Installation of hotwater 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
© Dimplex Boilers 2008 55
GGAASSLLEEAAKKSS
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LLOOCCAALLGGAASSSSUUPPPPLLIIEERR
TTEELL::00880000111111999999
CCoonnttrroollooffSSuubbssttaanncceessHHaazzaarrddoouussttooHHeeaalltthh
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.
Insulation 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.
GGaassaannddEElleeccttrriicciittyyCCoonnssuummeerrCCoouunncciill((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
given supervision or instructions concerning use of the
appliance by a person responsible for their safety. Children
should be supervised to ensure that they do not play with the
appliance.

11..00IINNTTRROODDUUCCTTIIOONN
1. The appliances incorporate a microprocessor based, fully
modulating air/gas ratio control system with direct burner
ignition. This provides a modulated heat output, with internal
frost protection provided as standard. The heat exchanger is
constructed 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 over 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
to section 6.5. It is recommended thata drain cock is fitted at
the lowest point in the system.
66© Dimplex Boilers 2008
11..55DDEESSCCRRIIPPTTIIOONN
RF room thermostats etc, are available as optional extras,
however if an external 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. AAllllssyysstteemmssmmuussttbbeetthhoorroouugghhllyyfflluusshheeddaannddttrreeaatteeddwwiitthh
iinnhhiibbiittoorr((sseeeesseeccttiioonn66..22))..
11..66OOPPTTIIOONNAALLEEXXTTRRAASS
• Boiler
• Wall fixing jig
• T
emplates & ‘Quick Fit’ Guide
• Literature Pack
• Plugs and screws
11..77PPAACCKKCCOONNTTEENNTTSS
11..44SSAAFFEEMMAANNUUAALLHHAANNDDLLIINNGG
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..00BBOOIILLEERRLLAAYYOOUUTT
22..11KKEEYY
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. Display
26. Flue Thermistor
27. Thermal Fuse
© Dimplex Boilers 2008 77
0
1
2
bar
3
4
0
1
2
bar
3
4
FFiigg..11
FFiigg..22
1
1
2
21 1
2
26 6
2
27 7
2
22 2
2
2
3
3
6
6
7
7
8
8
2
20 0
9
9
1
17 7
1
10 0
1
18 8
1
11 1
1
13 3
1
14 4
1
15 52 25 5
2
24 4
1
16 62 23 3
1
12 2
1
19 9
4
45
5

33..00BBOOIILLEERROOPPEERRAATTIIOONN
33..11CCEENNTTRRAALLHHEEAATTIINNGG
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 (anti-
cycling), the pump continues to run for a period of 2 minutes
(Pump Overrun).
88© Dimplex Boilers 2008
33..22FFRROOSSTTPPRROOTTEECCTTIIOONNMMOODDEE
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 setting until a flow temperature of 20°C is reached.
Further protection can be incorporated by using a system frost
thermostat.
33..33PPUUMMPPPPRROOTTEECCTTIIOONN
1. The pump will automatically operate for 1 minute in every 24 hours
to prevent sticking.
Expansion
Vessel Primary
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
Manual
Bleed Valve
FFiigg..33

44..00TTEECCHHNNIICCAALLDDAATTAA
44..11PPEERRFFOORRMMAANNCCEEDDAATTAA
© Dimplex Boilers 2008 99
A
Ap pp pl li ia an nc ce eC Cl la as ss si if fi ic ca at ti io on nC C1 13 3, ,C C3 33 3, ,C C5 53 3, ,B B2 23 3S Sy ys st te em m1 18 8S Sy ys st te em m3 30 0
Mode Rate
Output (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
Gross 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 m3/h 1.95 3.2
Seasonal Efficiency % 90.3 90.3
Seasonal 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
Min Central Heating Flow Temperature °C 30 30
G
Ge en ne er ra al lS Sp pe ec ci if fi ic ca at ti io on ns s
Max lift weight kg 33.6 39.6
Total water capacity Ltr 1.8 3.1
Integral 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
CO2value 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
CO2 value max rate (Propane) (Case must be fitted when taking reading) % 10.8-11.2 10.5-10.9
CO2value 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 Pressure - Propane mbar 37 37
C
Co on nn ne ec ct ti io on ns 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
P
P. .P P. .M M= =P Pa ar rt ts sP Pe er rM Mi il ll li io on n

55..00DDIIMMEENNSSIIOONNSS
1100© Dimplex Boilers 2008
125mm 125mm
10mm
Condensate
Drain
CH Flow
(22mm)
Gas Inlet
(22mm)
CH Return
(22mm)
Tap Rail
446mm
264mm 182mm
796mm
150mm
94mm
333mm
148mm185mm Tube Ø 100mm
FFiigg..44
FFiigg..55

66..00SSYYSSTTEEMMDDEETTAAIILLSS
66..11IINNFFOORRMMAATTIIOONN
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.
© Dimplex Boilers 2008 1111
66..33SSYYSSTTEEMMCCOONNTTRROOLL
1. It is recommended that external controls e.g. room
thermostat are fitted to further improve the operating
efficiency of the boiler and system.
66..22HHEEAATTIINNGGCCIIRRCCUUIITT
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
accordance with the manufacturer’s instructions. (Test kits are
available from inhibitor stockists.)
• For 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 over-run facility.

66..00SSYYSSTTEEMMDDEETTAAIILLSS
66..44SSYYSSTTEEMMFFIILLLLIINNGGAANNDDPPRREESSSSUURRIISSIINNGG
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.
for 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© Dimplex Boilers 2008
66..55EEXXPPAANNSSIIOONNVVEESSSSEELL
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..66PPRREESSSSUURREERREELLIIEEFFVVAALLVVEE
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 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
routed in such a manner thatno 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.
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tthheerreeffoorreeiittsshhoouullddbbeetteerrmmiinnaatteeddaawwaayyffrroommwwiinnddoowwssaanndd
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 (mH2O)
System 18
System 30
AVAILABLE PUMP HEADS
FFiigg..88
FFiigg..77
Expansion Vessel
Pressure
Relief Valve
Vessel charge and initial
system pressure
Total water content of
system using 8 litres
capacity expansion
vessel supplied with
appliance
For systems having a
larger capacity multiply
the total system capacity
in litres by this factor to
obtain the total minimum
expansion vessel capacity
required in litres
bar
litres
0.5
96
0.75
84
0.093
1.0
73
1.5
50
FFiigg..66
FFiigg..99
FFiigg..1100
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77..00SSIITTEERREEQQUUIIRREEMMEENNTTSS
77..11LLOOCCAATTIIOONN
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
Regulations.
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).
© Dimplex Boilers 2008 1133
77..22CCLLEEAARRAANNCCEESS
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
front 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..00SSIITTEERREEQQUUIIRREEMMEENNTTSS
77..33VVEENNTTIILLAATTIIOONNOOFFCCOOMMPPAARRTTMMEENNTTSS
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 = 88cm2
System 30 = 159cm2
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 level 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© Dimplex Boilers 2008
77..44GGAASSSSUUPPPPLLYY
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 completed installation should always be tested
for gas tightness
77..55EELLEECCTTRRIICCAALLSSUUPPPPLLYY
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 currentedition of the ETGI 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 system controls only.
Any additional mains cable should comply fully with the
current I.E.E. wiring regulations.
FFiigg..1133
Gas Service
Cock

77..00SSIITTEERREEQQUUIIRREEMMEENNTTSS
77..66CCOONNDDEENNSSAATTEEDDRRAAIINN
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
acceptable.
2. Ensure the discharge of condensate complies with any
national or local regulations in force.
BBSS66779988::22000000&&PPaarrttHHIIoofftthheeBBuuiillddiinnggRReegguullaattiioonnssggiivvee
ffuurrtthheerrgguuiiddaannccee..
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. IIttiissaaddvviissaabblleettookkeeeepptthheeccoonnddeennssaatteeppiippeeiinntteerrnnaall..
6. EExxtteerrnnaallrruunnssggrreeaatteerrtthhaann33mmeettrreessoorrrruunnssiinnccoollddaarreeaass
sshhoouulldduussee3322mmmmwwaasstteeppiippeeaannddbbeeiinnssuullaatteedd..
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.
Examples are shown of the following methods of terminations
(see 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
iv) to a purpose made soakaway
10. In exceptional circumstances, such as when a boiler is
installed in a basement without drainage, it may be necessary
to install a condensate pump to carry condensate up to ground/
drain level. Such products are available 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).
© Dimplex Boilers 2008 1155
50mm per metre of piperun
2.5° Minimum fall
450mm min
Termination to an internal soil and vent pipe
50mm per metre of pipe run
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 run
2.5° Minimum fall
Termination to a purpose made soak-away
Holes in the soak-away must
face away from the building
500mm min
NNOOTTAALLLLOOWWEEDD
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Th he er re es sh ho ou ul ld db be e
n
no oa ai ir rg ga ap p
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77..00SSIITTEERREEQQUUIIRREEMMEENNTTSS
77..77FFLLUUEE
1. This high efficiency boiler will discharge a plume of water
vapour from the flue. This should be considered when siting
the flue terminal.
2. The following guidelines indicate the general requirements
for siting balanced flue terminals. For GB recommendations are
given in BS 5440 Pt 1. For IE recommendations are given in
the current edition of I.S. 813 “Domestic Gas Installations”.
3. 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.
4. If a terminal is less than 2 metres above a balcony,above
ground or above a flat roof to which people have access, then
a suitable terminal guard must be provided - Part No: 951507.
IIMMPPOORRTTAANNTT::
• Only OONNEEof the 25mm clearances (Positions ‘O’ to ‘S’ in
the chart below) is allowable per installation.
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and nuisance
- free dispersal of combustion products.
1166© Dimplex Boilers 2008
NNOOTTEE::TThheemmiinniimmuummddiissttaanncceeffrroommaafflluueetteerrmmiinnaallttooaabboouunnddaarryylliinneeiiss330000mmmm..
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A
M,L
M,L
N
C
F
P
O
O
R
N
S
C
C
N
Flue terminals that require a guard fitting
P
B
J
H
N
N
G
Q
K
D
E
P
Po os si it ti io on nD De es sc cr ri ip pt ti io on nM Mi in ni im mu um mD Di is st ta an nc ce e( (m mm m) )
A Horizontally to an opening, air brick, opening window - see note A 300
BAbove an opening, air brick, opening window etc. - see note A 300
CBelow an opening, air brick, opening window etc. - see note A 300
D Below windows or openings on pitched roofs 2000
EAdjacent to windows or openings on pitched and flat roofs 600
FFrom an adjacent opening window (vertical only) 1000
G From an adjacent wall to flue (vertical only) 300
HHorizontally from a terminal on the same wall 300
JVertically from a terminal on the same wall 1500
K From an opening in a carport (e.g. door, window) into the dwelling 1200
LFrom a terminal facing a terminal (horizontal flue) 1200
From a terminal facing a terminal (vertical flue) 600
MFrom a surface or boundary line facing a terminal 600
N Above ground, roof or balcony level 300
O From an internal or external corner 25
P From a vertical drain pipe or soil pipe 25
Q Below balconies or car port roof 25
R Below eaves 25
S Below gutters, soil pipes or drain pipes 25
300mm Min 300mm Min
Adjoining Properties Boundary Line
TTEERRMMIINNAALLPPOOSSIITTIIOONN
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© Dimplex Boilers 2008 1177
88..11CCOONNCCEENNTTRRIICCAAIIRR//FFLLUUEEDDUUCCTTSSPPEECCIIFFIICCAATTIIOONNSS
The different flue applications shown in Fig. 20 are available as
kits comprising the connecting parts to the appliance and end
terminal. Flue extension ducts and extension elbows are
available as accessories.
88..22KKiittAA++TTeelleessccooppiiccHHoorriizzoonnttaallWWaallllTTeerrmmiinnaall
((CC1133))--PPaarrttNNoo..995566112200
60/100mm concentric, horizontal flue system Fig. 21, with a
maximum length of 10M.
The standard telescopic terminal is 615mm max length and
430mm min length, but can be cut to a minimum flue length of
250mm, which is suitable for single, 100mm (4”), brick walls.
NNoottee::If the telescopic flue kit is installed without any flue
extensions, it can be fitted horizontally. The maximum
length for 60/100mm horizontal concentric flue = 10M
NNoottee::Dimplex System 18 only, with maximum concentric
flue length of 10m, the heat input will be reduced by 7.6%
88..33KKiittBBVVeerrttiiccaallCCoonncceennttrriiccFFlluueeTTeerrmmiinnaall
((CC3333))--HHBBLLPPaarrtt995566008811
60/100mm concentric, vertical flue system, Fig. 22, with a
maximum length of 12M.
The kit comprises of the roof terminal, vertical adaptor with
sampling point and bracket.
The maximum length is measured from the top of the
appliance casing to the underside of the air cowl.
For installation details refer to the flue kit instructions.
Chimney flue liner kit
- Part no. 956082
Vertical flue kit - Part no. 956081
Vertical flue kit - Part no. 956081
with flat roof flashing plate
Split pipe vertical flue outlet kit
- Part no. 956080
with flat roof flashing plate
Raised external flue outlet kit
- Part no. 956084
Vertical flue kit - Part no. 956081
External vertical flue kit
- Part no. 956085
Standard telescopic
horizontal flue kit
- Part no. 956120
Optional Flue Systems
The pluming from the flue may
cause nuisance to neighbours
or other buildings.
60/100 flue accessories:
0.5m flue extension duct - 956092
1m flue extension duct - 956093
93 flue extension elbow - 956091
45 flue extension elbow (2x) - 956090
Vertical flue turret - 956087
Ø60/100mm concentric
standard horizontal wall
terminal.
Max. length 10,000mm.
Min. length 250mm.
Standard telescopic horizontal flue kit - Part no. 956120
Horizontal terminal has a
built-in fall in the flue to allow
condensate to drain away.
If horizontal flue requires
extension pipe. the flue
should be installed such
that there is no section less than
1.5° - 3° to the horizontal,
falling back towards the boiler.
93 flanged elbow (concentric)
with sampling point
Kit A +
Vertical flue kit - Part no. 956081
Suitable for 25 - 45°
Pitch Angle
Length
Kit B
60/100 flue accessories:
0.5m flue extension duct - 956092
1m flue extension duct - 956093
93 flue extension elbow - 956091
45 flue extension elbow (2x) - 956090
Pitched roof flashing kit - 956089
Flat roof flashing plate - 840512
93 flanged flue elbow - 956086
Max. length12m.
Min. length 0.6m.
Roof terminal
with rain cover
and pitched roof
flashing kit.
Vertical flue socket
with sampling point.
Top of Boiler
to underside of Cowl
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88..00FFLLUUEEOOPPTTIIOONNSS
1188© Dimplex Boilers 2008
88..55KKiittCCHHoorriizzoonnttaallAAnnttii--PPlluummeeFFlluueeKKiitt
((CC1133))--PPaarrttNNoo..995566008844
This kit is recommended if the condensate plume from the flue
may cause a nuisance or affect the surroundings. The air inlet
remains outside and the flue duct is routed separately using a
60mm duct enclosed by a protective 80mm tube. To calculate
the maximum lengths of 60/100 concentric flue and 60mm
flue ducts, use the table below.
For installation details refer to the flue kit instructions.
Dimensions from vertical terminals to opening windows should
be in line with Fig. 19.
(For use with Standard horizontal telescopic flue kit - Part no.
956120 - only).
This kit is useful for deflecting the condensate plume away
from walls or boundaries. It should only be used to deflect the
condensate plume left or right.
60/100mm concentric vertical flue system.
Maximum length = 12m. The flue kit contains two additional
45° elbows and 2.5 metres of 60/100 concentric ducts as well
as a special wall bracket to pass the guttering (see Fig. 26).
The concentric flue will be routed vertically alongside the
outside wall to above the roofline. Special seals are required to
prevent rainwater penetrating the pipe joints.
For installation details refer to the flue kit instructions.
88..66PPlluummeeDDiivveerrtteerrTTeerrmmiinnaallKKiitt
PPaarrttNNoo..995566110033
88..77KKiittDDEExxtteerrnnaallVVeerrttiiccaallFFlluuee
((CC3333))--PPaarrttnnoo..995566008855
93 flanged elbow (concentric)
with sampling point
Raised external flue outlet kit -
Part no. 956084
Kit C
Raised Ø60mm flue
outlet duct with
Ø80mm anti-freeze
pipe.
Max height of raised
flue from top of boiler
to centre of outlet 8.5m
Min height 1m.
93 flanged elbow (concentric)
with sampling point
Max. lengths (from top of
boiler to AIR COWL 12m
Min. length 1m.
Kit D
Ø60/100mm concentric
air/flue pipe -
Part no. 956093
(1m extension)
and
Part no, 956092
(0.5m extension)
For outside installations
the pipe joints have to
be covered with special
“lip-seal” to prevent
rain ingress.
Ensure all horizontally fitted
pipes are routed with a
1.5-3° fall towards the boiler.
External vertical flue kit - Part no. 956085
Roof terminal
with rain cover.
88..44TToottaallEEqquuiivvaalleennttLLeennggtthhssffoorrCCoonncceennttrriicc
((6600//110000mmmm))fflluueessyysstteemmss
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FFiigg..2233
FFiigg..2255
FFiigg..2266
CCoommppoonneenntt
45° Bend
93° Bend
0.5m Extension
1.0m Extension
Support Bracket
EEqquuiivvaalleennttlleennggtthhiinnmmeettrreess
0.5m
1.0m
0.5m
1.0m
N/A
PPaarrttnnuummbbeerr
956090 - 2 off
956091
956092
956093
840517
CCoonncceennttrriicc((6600//110000mmmm))
fflluueelleennggtthh((mmeettrreess))00..3300..55
4455°°BBeenndd
11..0011..5522..0022..5533..0033..5544..0044..5555..00
MMaaxxiimmuumm((6600//8800mmmm))fflluuee
lleennggtthhaalllloowweedd((mmeettrreess))99..22
EExxaammppllee::IIffrreeqquuiirreeddlleennggtthhooff6600//110000mmmmccoonncceennttrriicc==11mm
tthheennmmaaxxiimmuumm6600//8800lleennggtthh==88..55mm
99..0088..558877..557766..556655..555544..55
SSuuppppoorrttBBrraacckkeett
9933°°BBeenndd
00..55mmEExxtteennssiioonn
11..00mmEExxtteennssiioonn

88..00FFLLUUEEOOPPTTIIOONNSS
© Dimplex Boilers 2008 1199
88..88KKiittEECChhiimmnneeyyFFlluueeLLiinneerrKKiitt
((BB2233))--PPaarrttnnoo..995566008822
NNoottee::
Dimplex System 18 and 30: Maximum flue length = 30m.
Minimum length for all Dimplex System boilers = 5m.
This kit is suitable for open flue application in accordance with
BS5440 parts 1 & 2 where a room sealed flue installation is
impractical. The kit comprises of a flue adaptor from the
appliance to the chimney, a flexible plastic flue liner with
connection parts and chimney terminal (see Fig. 27). Further
guidance on ventilation requirements is given in section 7.3.
See ‘Total equivalent lengths for concentric (60/100mm) flue
systems’
88..1100KKiittFF::TTwwiinnFFlluueeSSyysstteemm
((CC5533))--PPaarrttnnoo..995566008800
NNoottee::
Maximum flue length (air duct + flue duct) = 38m.
Minimum flue length (air duct + flue duct) = 10m.
The kit comprises of a twin adaptor suitable for 80mm ducts,
from which the air intake is taken from the adjacent outside
wall (see Fig. 28) and the flue duct is routed vertically through
the roof.
It is nnoottrecommended to route the flue duct through living
space areas, i.e. bedrooms, living rooms etc.
For installation details refer to the instructions provided with
the twin flued kit.
Centralising brackets
Chimney terminal
93 flanged elbow (concentric)
with sampling point
Ø60/100mm concentric
chimney adaptor pipe.
The chimney must be swept
and cleared of any debris
and obstructions.
Chimney
plate
Flexible corrugated plastic flue liner
Ø80mm according to EN 14471
Max. length 30m.
Min. length 5m.
KIT E
Chimney flue liner kit - Part no. 956082
Ø80mm air intake
Split flue system
Roof terminal with pitched
roof flashing kit.
If the flue pipe passes
through compartment
from wall/floors, the
requirements set out
in Building Regulations
Part B must be followed.
Ø80mm twin adaptor
with sampling point.
If the flue pipe are boxed in then
access must be provided to inspect
the flue ducts during installation
and subsequent service visits.
The access panels and flue boxing
should be sealed from the room.
Split pipe vertical
flue outlet kit -
Part no. 956080
Kit F
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CCoommppoonneenntt
90° Bend
45° Bend
1.0m Extension
2.0m Extension
EEqquuiivvaalleennttlleennggtthhiinnmmeettrreess
AAiirrDDuucctt
4.0m
2.0m
1.0m
2.0m
FFlluueeDDuucctt
8.0m
4.0m
2.0m
4.0m
PPaarrttnnuummbbeerr
956100
956099
956101
956102
88..99KKiittEE::KKeeyyfflluueeddiimmeennssiioonnss++AAcccceessssoorriieess
Minimum length 60/100mm horizontal flue 100mm From boiler to chimney
Maximum length 60/100mm horizontal flue 2000mm From boiler to chimney
Minimum length 60/100mm vertical flue 200mm From boiler to chimney
Maximum length 60/100mm vertical flue 2000mm From boiler to chimney
Minimum length 80mm flue liner 5000mm From adaptor to chimney terminal
Maximum length 80mm flue liner 30000mm From adaptor to chimney terminal
A
Ac cc ce es ss so or ry yL Le en ng gt th hP Pa ar rt tN Nu um mb be er r
80mm Flexitube flue liner 10m 956110
80mm Flexitube flue liner 20m 956111
80mm Flexitube flue liner 30m 956112
Boiler vertical flue adaptor/turret socket N/A 956087

99..00IINNSSTTAALLLLAATTIIOONN
99..11UUNNPPAACCKKIINNGG&&IINNIITTIIAALLPPRREEPPAARRAATTIIOONN
TThheeggaassssuuppppllyy,,ggaassttyyppeeaannddpprreessssuurreemmuussttbbeecchheecckkeeddffoorr
ssuuiittaabbiilliittyybbeeffoorreeccoonnnneeccttiioonn
1. Remove the top cardboard tray from the carton.
2. The wall fixing jig is packed in its own cardboard sleeve.
Carefully slide this out of the carton.
3. To avoid scratching the boiler outercase, keep the outer
carton in place.
4. After reviewing the site requirements (see Section 7.0),
position the fixing template on the wall ensuring it is level both
horizontally and vertically.
5. Mark the position of the fixing holes for the wall plate and
boiler lower fixing holes.
6. Mark the position of the centre of the flue hole (rear exit).
For side flue exit, mark as shown (Fig. 4).
7. If required, mark the position of the gas and water pipes.
Remove the template.
8. Cut the hole for the flue (minimum diameter 110mm).
9. Drill the wall as previously marked to accept the wall plugs
supplied. Secure the wall fixing jig using the fixing screws.
10. Using a spirit level ensure that the fixing jig is level before
finally tightening the screws.
11. Flush and clean the system using an appropriate cleanser
(Fig. 30).
12. Connect the gas and water pipes to the valves on the wall
fixing jig.
13. Fit the filling loop as described in the instructions supplied
with it.
2200© Dimplex Boilers 2008
FFiigg..3300
Flushing Pipe
Central Heating Flow
or Return Pipe
FFiigg..2299