Glen Dimplex System 18 User guide

© Dimplex Boilers 2008Part No: 751262 - Issue 4 - 07/07/10
Glen Dimplex Boilers is continually improving its products and therefore
reserve the right to change product specifications without prior notice.
Errors & omissions excepted.
Glen Dimplex Boilers
Stoney Lane
Prescot
Merseyside. L35 2XW
For all telephone enquiries call:
0844 371 2222
website:
www.glendimplexboilers.com
Part of the Glen Dimplex Group
SALES AND SERVICE HELPLINE: 0844 371 1111
System 18
System 30
System Condensing Boilers
Installation and
Servicing Instructions
These instructions should be left with the user
© Dimplex Boilers 2008
751262 MANUAL 19/10/10 08:41 Page 1

GAS COUNCIL NUMBERS
Natural Gas
Dimplex System 18 - Gas Council Appliance No:
41 149 02
Dimplex System 30 - Gas Council Appliance No:
41 149 01
2
© Dimplex Boilers 2008
APPROVED PRODUCT
© Dimplex Boilers 2008
47
751262 MANUAL 19/10/10 08:41 Page 2

17.0 BENCHMARK
46
© Dimplex Boilers 2008
VENTED CYLINDER COMMISSIONING CHECKLIST
This Commissioning Checklist is to be completed in full by the competent person who commissioned the
cylinder as a means of demonstrating compliance with the appropriate Building Regulations and should
remain attached to the cylinder for future reference.
Failure to install and commission this equipment to the manufacturer’s instructions may invalidate the
warranty but does not affect statutory rights.
Commissioned by (print name)
Company Name
Company Address
Telephone Number Commissioning Date
To be completed by the customer on receipt of a Building Regulations Compliance Certificate*:
Building Regulations Notification Number (if applicable)
ALL CYLINDERS
The vent pipe has been installed to BS6700/BS5449 Yes
What is the static head? metres
Has an immersion heater been fitted? Yes No
If yes, does it have a non-auto resetting energy cut out? Yes No
Is the cold feed cistern supported in accordance with BS4213? Yes
Is the cylinder solar (or other renewable) compatible? Yes No
All appropriate pipes including the vent pipe have been insulated
up to 1metre or the point where they become concealed Yes
*Where an installation is notifiable in England & Wales this will be made to Local Authority Building Control
(LABC) either directly or through a Competent Persons Scheme. A Building Regulations Compliance
Certificate will then be issued to the customer.
©Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk
Commissioning Engineer’s Signature
Customer’s Signature
(To confirm satisfactory demonstration and receipt of manufacturer’s literature)
INDIRECT ONLY
A cylinder thermostat has been fitted in the recommended position Yes
The hot water is controlled by a programmer or time switch Yes
Is the system fully pumped? Yes No
Type of control system Y Plan S Plan Other
18.0 WARRANTY TERMS & CONDITIONS
18.1 DIMPLEX 5YR WARRANTY
1. Registration must be completed within 30 days of installation. Failure to return within 30 days will invalidate your warranty. Registration if
effected by returning the enclosed registration card to the commercial center of Dimplex at 5 Spartan Close, Tachbrook Park, Leamington Spa,
CV34 6RR. Proof of postage should be obtained.
2. The Benchmark document must be completed by installer/householder at the time of installation and must be presented to our engineer at
subsequent visits.
3. The boiler must be serviced annually, at the householders expenses in accordance with manufacturer’s instructions, and this service must be
booked through Dimplex by calling 0844 371 1121
4. The service must be carried out by a Dimplex approved central heating engineer. Any work carried out by a non-Dimplex approved engineer
will invalidate this warranty.
5. Appropriate system cleaning (e.g. power flush) and the correct use of additives must be carried out at the time of installation. Failure to
cleanse the system will invalidate this warranty. Evidence of cleansing should be presented to our engineer upon request.
6. This warranty applies only to manufacturing problems with the boiler; damage caused through misuse, incorrect operation, foreign bodies in
the heating system, system faults and failures are not covered.
7. This warranty applies only if the boiler is installed and used in accordance with the manufacturer’s instructions, in normal domestic
applications.
8. Providing all the above Terms and Conditions are met, this warranty covers functional parts and labour.
9. Dimplex offer the opportunity for a system audit and commissioning check within 30 days of registration. This is chargeable at the same rate
as an annual service and if taken up then the first annual service will be provided free of charge. Failure to take up this offer may invalidate
the full warranty which will revert to a standard 2 year warranty which will require an annual service In year 2 in any event.
10. Failure to meet any of the above Terms and Conditions will invalidate this warranty.
CONTENTS
SECTION DESCRIPTION PAGE
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 21
10.0 Commissioning 25
11.0 Service Mode 27
12.0 Servicing & Maintenance 28
13.0 Changing Components 31
14.0 Electrical 39
15.0 Spare Parts 40
16.0 Error Codes 41
17.0 Benchmark 42
18.0 Warranty Terms & Conditions 46
© Dimplex Boilers 2008
3
751262 MANUAL 19/10/10 08:41 Page 3

1.0 INTRODUCTION
1.1 BUILDING REGULATIONS AND BENCHMARK CHECKLIST
Building Regulations (England & Wales) require notification of
the installation of a heating appliance to the relevant Local
Authority Building Control Department.
From 1 April 2005 this can be achieved via a Competent
Persons Self Certification Scheme as an option to notifying the
Local Authority directly.
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.
4
© Dimplex Boilers 2008
1.2 INSTALLATION, COMMISSIONING, SERVICE & REPAIR
This appliance must be installed in accordance with the
manufacturer’s instructions and the regulations in force. Read
the instructions fully before installing or using the appliance.
In GB, this must be carried out by a competent person as
stated in the Gas Safety (Installation & Use) Regulations.
Definition of competence:
A person who works for a CORGI
registered company and holding current certificates in the
relevant ACS modules, is deemed competent.
In IE, this must be carried out by a competent person as stated
in I.S. 813 “Domestic Gas Installations”
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.
Warning -
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
17.0 BENCHMARK
© Dimplex Boilers 2008
45
SERVICE RECORD
It is recommended that your hot water system is serviced regularly and that the appropriate Service Record is completed.
Service Provider
Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s
instructions.
SERVICE 1 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 2 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 3 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 4 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 5 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 6 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 7 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 8 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 9 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
SERVICE 10 Date
Engineer Name
Company Name
Telephone Number
Comments
Signature
751262 MANUAL 19/10/10 08:41 Page 4

17.0 BENCHMARK
44
© Dimplex Boilers 2008
MAINS PRESSURE HOT WATER STORAGE SYSTEM COMMISSIONING CHECKLIST
*llA installations in England and Wales must be notified to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme.
A Building Regulations Compliance Certificate will then be issued to the customer.
©Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk
ALL SYSTEMS PRIMARY SETTINGS (indirect heating only)
Is the primary circuit a sealed or open vented system? Sealed Open
What is the maximum primary flow temperature? °C
ALL SYSTEMS
What is the incoming static cold water pressure at the inlet to the system? bar
Has a strainer been cleaned of installation debris (if fitted)? Yes No
Is the installation in a hard water area (above 200ppm)? Yes No
If yes, has a water scale reducer been fitted? Yes No
What type of scale reducer has been fitted?
What is the hot water thermostat set temperature? °C
What is the maximum hot water flow rate at set thermostat temperature (measured at high flow outlet)?
l/min
Time and temperature controls have been fitted in compliance with Part L of the Building Regulations? Yes
Type of control system (if applicable) Y Plan S Plan Other
Is the cylinder solar (or other renewable) compatible? Yes No
What is the hot water temperature at the nearest outlet? °C
All appropriate pipes have been insulated up to 1 metre or the point where they become concealed Yes
UNVENTED SYSTEMS ONLY
Where is the pressure reducing valve situated (if fitted)?
What is the pressure reducing valve setting? bar
Has a combined temperature and pressure relief valve and expansion valve been fitted and discharge tested? Yes No
The tundish and discharge pipework have been connected and terminated to Part G of the Building Regulations Yes
Are all energy sources fitted with a cut out device? Yes No
Has the expansion vessel or internal air space been checked? Yes No
THERMAL STORES ONLY
What store temperature is achievable? °C
What is the maximum hot water temperature? °C
ALL INSTALLATIONS
The hot water system complies with the appropriate Building Regulations Yes
The system has been installed and commissioned in accordance with the manufacturer’s instructions Yes
The system controls have been demonstrated to and understood by the customer Yes
The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes
Commissioning Engineer’s Signature
Customer’s Signature
(To confirm satisfactory demonstration and receipt of manufacturer’s literature)
This Commissioning Checklist is to be completed in full by the competent person who commissioned the storage system as a means of
demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.
Failure to install and commission this equipment to the manufacturer’s instructions may invalidate the warranty but does not affect statutory rights.
Customer Name Telephone Number
Address
Cylinder Make and Model
Cylinder Serial Number
Commissioned by (print name) Registered Operative ID Number
Company Name Telephone Number
Company Address
Commissioning Date
To be completed by the customer on receipt of a Building Regulations Compliance Certificate*:
Building Regulations Notification Number (if applicable)
1.0 INTRODUCTION
1.3 LEGISLATION
The appliance is suitable only for installation in GB and IE and
should be installed
i
in accordance with the rules in force, and
only used in a suitably ventilated location.
In GB, the installation must be carried out by a CORGI
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
• Gas Safety (Installation & Use) Regulations.
• The appropriate Building Regulations either The Building
regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current edition of
I.S. 813 ‘Domestic Gas Installations’, the current Building
Regulations and reference should be made to the current ETCI
rules for electrical installation.
All sy
s
stems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
Codes of Practice - r
e
efer to the most recent version
In GB the following Codes of Practice apply:
Standard Scope
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 1 Flues
BS 5440 Part 2 Ventilation
BS 7074 Expansion vessels and ancillary equipment
for sealed water systems
BS 7593 Treatment of water in domestic hot water
central heating systems
In IE the following Codes o
f
fPractice apply:
Standard Scope
I.S. 813 Domestic Gas Installation
The following standards give valuable additional information;
BS 5546 Installation of hot water supplies for domestic
purposes
BS 5449 Forced circulation hot water systems
BS 7074 Expansion vessels and ancillary equipment
for sealed water systems
BS 7593 Treatment of water in domestic hot water
central heating systems
© Dimplex Boilers 2008
5
GAS LEAKS
DO NOT OPERATE ANY ELECTRICAL SWITCHES, OR USE A
NAKED FLAME. TURN OFF THE GAS SUPPLY. VE
N
NTILATE THE
AREA BY OPENING DOORS AND WINDOWS. CALL OUT YOUR
LOCAL GAS SUPPLIER
TEL: [phone]
Co
n
ntrol of Substances Hazardous to Health
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.
Gas and Electricity Consumer Council (Energywatch)
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.
751262 MANUAL 19/10/10 08:41 Page 5

1.0 INTRODUCTION
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 that a drain cock is fitted at
the lowest point in the system.
6
© Dimplex Boilers 2008
1.5 DESCRIPTION
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.
All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
1
1.6 OPTIONAL EXTRAS
• Boiler
• Wall fixing jig
• Templates & ‘Quick Fit’ Guide
• Literature Pack
• Plugs and screws
1.7 PACK CONTENTS
1.4 SAFE MANUAL HANDLING
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.
17.0 BENCHMARK
© Dimplex Boilers 2008
43
It is recommended that your heating system is serviced regularly and that the appropriate Service Record is completed.
Service Provider
Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s
instructions.
Always use the manufacturer’s specified spare part when replacing controls.
SERVICE 1 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 3 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 5 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 7 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 9 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 2 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 4 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 6 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 8 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE 10 Date
Energy Efficiency Checklist completed? Yes No
Engineer Name
Company Name
Telephone Number
CORGI ID Number
Comments
Signature
SERVICE RECORD
751262 MANUAL 19/10/10 08:41 Page 6

17.0 BENCHMARK
42
© Dimplex Boilers 2008
GAS BOILER SYSTEM COMMISSIONING CHECKLIST
CONTROLS Tick the appropriate boxes
Time and Temperature Control to Heating Room Thermostat and Programmable Load/Weather Optimum Start
Programmer/Timer Room Thermostat Compensation Control
Time and Temperature Control to Hot Water Cylinder Thermostat and Programmer/Timer Combination Boiler
Heating Zone Valves Fitted Not Required
Hot Water Zone Valves Fitted Not Required
Thermostatic Radiator Valves Fitted Not Required
Automatic Bypass to System Fitted Not Required
Boiler Interlock Provided
ALL SYSTEMS
The system has been flushed and cleaned in accordance with BS7593 and boiler manufacturer’s instructions Yes
What system cleaner was used?
What inhibitor was used? Quantity litres
CENTRAL HEATING MODE Measure and Record:
Gas Rate m3/hr OR
ft3/hr
Burner Operating Pressure (if applicable) mbar OR Gas Inlet Pressure mbar
Central Heating Flow Temperature °C
Central Heating Return Temperature °C
COMBINATION BOILERS ONLY
Is the installation in a hard water area (above 200ppm)? Yes No
If yes, has a water scale reducer been fitted? Yes No
What type of scale reducer has been fitted?
DOMESTIC HOT WATER MODE Measure and Record:
Gas Rate m3/hr OR
ft3/hr
Burner Operating Pressure (at maximum rate) mbar OR Gas Inlet Pressure (at maximum rate) mbar
Cold Water Inlet Temperature °C
Hot water has been checked at all outlets Yes Temperature °C
Water Flow Rate l/min
CONDENSING BOILERS ONLY
The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 Yes
ALL INSTALLATIONS
If required by the manufacturer, record the following CO2% OR CO ppm OR CO/CO2Ratio
The heating and hot water system complies with the appropriate Building Regulations Yes
The boiler and associated products have been installed and commissioned in accordance with the manufacturer’s instructions Yes
The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes
The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes
*All installations in England and Wales must be notified to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme.
A Building Regulations Compliance Certificate will then be issued to the customer.
©Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk
Commissioning Engineer’s Signature
Customer’s Signature
(To confirm satisfactory demonstration and receipt of manufacturer’s literature)
This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating
compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.
Failure to install and commission this equipment to the manufacturer’s instructions may invalidate the warranty but does not affect statutory rights.
Customer Name Telephone Number
Address
Boiler Make and Model
Boiler Serial Number
Commissioned by (print name) CORGI ID Number
Company Name Telephone Number
Company Address
Commissioning Date
To be completed by the customer on receipt of a Building Regulations Compliance Certificate*:
Building Regulations Notification Number (if applicable)
2.0 BOILER LAYOUT
2.1 KEY
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
7
0
1
2
bar
3
4
0
1
2
bar
3
4
Fig. 1
Fig. 2
1
21
26
27
22
2
3
6
7
8
20
9
17
10
18
11
13
14
15 2524
16 23
12
19
45
751262 MANUAL 19/10/10 08:41 Page 7

3.0 BOILER OPERATION
3.1 CENTRAL HEATING
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).
8
© Dimplex Boilers 2008
3.2 FROST PROTECTION MODE
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.
3.3 PUMP PROTECTION
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
Valv e
Pump &
Hydroblock
Automatic
Air
Vent
CH
Flow
Flue Products
Manual
Bleed Valve
Fig. 3
16.0 ERROR CODES
The boiler is in an ERROR state when there is an error code flashing on the back lit display.
CH = C
e
entral Heating
BCC = Boiler Chip Card
Press and release the RESET button, the control tries to i
n
nitiate a restart if possible
ERROR CODE DESCRIPTION REASON ACTION RESET POSSIBLE
1 Overheated CH Water temperature •Check no air is in heat exchanger/CH system
appliance greater than 105°C •Check plate heat exchanger for blockages Y
•Check CH thermistor
•Check system bypass is functional
4 No flame No flame signal on ignition •Check detection electrode/lead – electrode may require cleaning
•Check spark gap
•Check gas supply & pressure Y
•Check flue system is connected properly
•Check condensate trap not blocked
•Check gas valve and/or lead
5 Flame loss Loss of flame signal •Check detection electrode/lead Y
during operation •Check gas valve mains lead
6 Temporarily Water temperature •Check overheat thermostat
overheated appliance greater than 95°C •Check no air is in heat exchanger/CH system
•CH system and hot water plate heat exchanger blockage Auto Re-start after 1 minute
•Check CH thermistor
•Check system bypass is functional
7 Overheated appliance Flue over temperature •Check no air in heat exchanger
> 92°C •Check flue thermistor
•Check flue system Y
•Check pump
•Check PCB/X8 connector
11 Flame simulation Flame detected when •Check detection electrode/lead electrode may require cleaning Y
gas valve closed •Check gas valve operation.
12 No ignition CH Flow thermistor failure •Check CH flow thermistor – open circuit Auto Re-start when fixed
•Check PCB/X6 connector – open circuit
13 No flame Flue thermistor failure •Check PCB/X8 connector
•Check flue thermistor Auto Re-start when fixed
•Check thermal fuse – open circuit
16 No ignition CH Return thermistor failure •Check CH return thermistor – open circuit Auto Re-start when fixed
•Check PCB/X6 connector – open circuit
20 No flame Gas valve V1-V2 failure •Check/replace gas valve
•Check gas valve harness Y
•Check PCB/X2A
24 Faulty fan signal, Missing or defective •Check fan operation
no flame and fan signal from fan. •Check fan connection Y
runs continuously •Check PCB/X3 connector
•Check flue condition
32 No flame Power supply failure •Check mains supply voltage to boiler Auto Re-start when fixed
•Check all PCB connectors
34 CRC Error / No flame Incorrect BCC •Replace correct BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
35 BCC Error / No flame Incorrect/missing BCC •Reseat or replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
36 BCC Error / No flame Damaged BCC •Replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
37 BCC Error / No flame Different BCC •BCC and PCB software incompatible, replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
38 BCC Error / No flame Different BCC •Reset the appliance in accordance with BCC fitting instructions Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
39 BCC Error / No flame BCC installation failed •Refit BCC in accordance with BCC fitting instructions Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
41 Water flow failure/ Low water pressure •Check CH flow circulation
Flame for a short Reversed sensors •Check water pressure(> 0.5 bar)
period only •Check pump/lead Y
•Check expansion vessel
•Check flow and return sensors connected correct way around
42 Water flow failure/ Low water pressure •Check no air in heat exchanger
Flame for a short No flow •Check CH flow circulation
period only Dry run protection •Check water pressure(> 0.5 bar) Y
•Check pump/lead
•Check expansion vessel
50 BCC Error / No flame BCC Activation •Press reset to activate BCC (BCC’s only fitted to replacement PCB’s) Y
(No display) No light indication Defective power supply •Check power supply
•Check PCB/X1B connector Auto Re-start when fixed
•Check PCB fuse
© Dimplex Boilers 2008
41
751262 MANUAL 19/10/10 08:41 Page 8

15.0 SPARE PARTS
15.1 SHORT PARTS LIST
40
© Dimplex Boilers 2008
Key GC Number Description QTY Pt. No.
1 H29-740 Electrode - Ignition c/w Gasket 1 988526
2 H38-213 Detection Electrode c/w Gasket 1 988540
3 H29-236 Spark Generator c/w Lead 1 500665
4 TBA System 18 & 30 gas control valve assembly NG 1 988660
5 H38-215 Fan Assembly 1 601016
6a H29-172 Burner (System18) 1 700600
6b TBA Burner (System 30) 1 700602
7 TBA Burner Door Insulation 1 352671
8a H38-217 Heat Exchanger (System18) 1 451101
8b TBA Heat Exchanger (System 30) 1 451151
9 H29-202 Pump Head 6m 1 500672
11 H29-237 Expansion Vessel 1 451020
12 TBA 3 Bar Pressure Relief valve 1 500751
13 H29-213 Water Temperature sensor 2 500661
14 H38-219 Flue Thermistor 1 500662
16 E23-541 Pressure Gauge 4bar 1 450961
17 TBA Auto Air Vent 1 500752
18a TBA Dimplex System 18 NG PCB Kit 1 988663
18b TBA Dimplex System 30 NG PCB Kit 1 988583
22 H29-179 Valve - Manual Bleed 1 300730
23 H38-226 Heat Exchanger seal & Clip Kit 1 988546
24 H29-208 Hydroblock - O-Ring and Clip 1 988669
25 TBA Hydroblock Manual bleed cock 1 500708
1
2
34
5
6
8
7
12
13 14
11
16
9
22
17
23
24
25
18
4.0 TECHNICAL DATA
4.1 PERFORMANCE DATA
© Dimplex Boilers 2008
9
Appliance Classification C13, C33, C53, B23 System 18 System 30
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
General Specifications
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
Connections
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.M = Parts Per Million
751262 MANUAL 19/10/10 08:41 Page 9

5.0 DIMENSIONS
10
© 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
1.5° - 3.0°
Tube Ø 100mm
Fig. 4
Fig. 5
14.0 ELECTRICAL
14.1 ILLUSTRATED WIRING DIAGRAM
© Dimplex Boilers 2008
39
br
b
g/y
bk
g
o
br
b
g/y
gr
br b
br
b
g/y
r
L3 L2 L1N
LCD DISPLAY
RIBBON TO PCB
RIBBON TO
LCD DISPLAY
MAINS
POWER
GAS VALVES
230Vac
FAN
230Vac
RETURN TEMP
THERMISTER
(5K NTC)
BOILER
TO PC
COM PORT
FLOW TEMP
THERMISTER
(5K NTC)
BOILER PUMP
230Vac
DETECTION
ELECTRODE
IGNITION
ELECTRODE
SPARK GENERATOR
230Vac
ROOMSTAT OR LINK
X1B MAINS
X1C BOILER PUMP
X2A GAS VALVES
X3 FAN
X5 COM PORT
X6 FLOW N.T.C.
BOILER CHIP CARD BCC
X6 RETURN N.T.C.
X2B IGNITER / FLAME SENSOR
bk bk
bb
y
FLUE TEMP
THERMISTER
(5K NTC)
THERMAL FUSE
o
g
br
wy
Key - Cable Colours
g Green
y Yellow
b Blue
r Red
bk Black
o Orange
g/y Green / Yellow
br Brown
gr Grey
w White
br
b
g/y
X8 FAN CONTROL
X8 FLUE
(IF FITTED)
X4 HYDROBLOCK DIVERTER
y
o b g/y rbr
751262 MANUAL 19/10/10 08:41 Page 10

13.0 CHANGING COMPONENTS
13.18 PCB
1. Ensure supply voltage is fully isolated.
2. Undo the screws holding the control box and gently ease
the box forward (Fig. 69).
3. Locate the retaining barbs on the top of the fascia and
unclip them from the control box.
4. Unclip the PCB from the plastic control box.
5. Note the positions of all the connections on the PCB
and disconnect them.
(DO NOT REMOVE THE YELLOW BCC (Fig. 69))
6. Carefully unclip and remove the ribbon cable
from the PCB and withdraw.
7. Fit all the connection plugs to the new PCB
including the ribbon cable, take care not to damage
the PCB.
8. Unless specifically instructed
NOT
to do so by the Dimplex
Service Department, always fit the new BCC if supplied with
the replacement PCB.
NOTE:
Always double check the label on the BCC card to
ensure it is the correct BCC for the boiler model to which it
is being fitted.
NEVER FIT AN INCORRECT BCC.
9. Reassemble in reverse order, ensuring that the control knob
are reset to their previous positions
38
© Dimplex Boilers 2008
13.19 BCC
1. Ensure supply voltage is fully isolated.
2. Dismantle the control box as described above to gain access
to the PCB (Fig. 69).
3. Note the orientation of the existing BCC (if fitted) and
carefully remove by sliding it off the edge of the PCB.
4. Re-fit the new BCC by sliding it onto the edge of the PCB,
ensuring the orientation is correct.
NOTE:
Always double check the label on the BCC card to
ensure it is the correct BCC for the boiler model to which it
is being fitted.
NEVER FIT AN INCORRECT BCC.
5. Reassemble as above.
6. Power up boiler, and briefly press the reset button, wait for
at least 5 seconds and then briefly press the reset button
again.
7. The boiler should now be checked for correct operation.
PCB
Facia
Control Box
Retaining Barbs
Pressure
Gauge
User Interface
Control Knob
Fig. 69
BCC
6.0 SYSTEM DETAILS
6.1 INFORMATION
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
11
6.3 SYSTEM CONTROL
1. It is recommended that external controls e.g. room
thermostat are fitted to further improve the operating
efficiency of the boiler and system.
6.2 HEATING CIRCUIT
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.
751262 MANUAL 19/10/10 08:41 Page 11

6.0 SYSTEM DETAILS
6.4 SYSTEM FILLING AND PRESSURISING
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.
12
© Dimplex Boilers 2008
6.5 EXPANSION VESSEL
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”.
6.6 PRESSURE RELIEF VALVE
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 that no hazard occurs to occupants or
causes damage to wiring or electrical components. The end of
the pipe should terminate facing down and towards the wall.
NOTE: Boiling water/steam could discharge from the pipe,
therefore it s
h
hould be terminated away from windows and
doors.
Mains
Supply
CH
Return
Pressure
Relief
Discharge
Pipe
Temporary
Loop
Stop
Val ve
Stop
Val ve
Double
Check
Val ve
GasCH
Flow
Condensate
1
0123456789101112131415161718
2
3
4
5
6
7
FLOW RATE Ltr/min
PUMP HEAD (mH2O)
System 18
System 30
AVAILABLE PUMP HEADS
Fig. 8
Fig. 7
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
Fig. 6
Fig. 9
Fig. 10
NOTE: Do not use the pressure relief valve to drain the system, because dirt
and debris could preven
t
tthe valve seating correctly.
13.0 CHANGING COMPONENTS
© Dimplex Boilers 2008
37
13.16 EXPANSION VESSEL
1. Drain the primary circuit and undo the nut on the vessel
connection pipe.
2. Remove the two screws holding the retaining bracket and
remove the bracket (Fig. 67).
3. Carefully slide out the vessel from the boiler.
4. Reassemble in reverse order.
Expansion Vessel
Vessel Connection Pipe
Retaining
Bracket
Fig. 67
Fig. 68
Flue Elbow
Flue Adaptor
Main Heat
Exchanger
Left Hand
Retaining Bracket
Right Hand
Retaining Bracket
Flow Pipe
Retaining Clip
Return Pipe Retaining Clip
Manual Air Vent
13.17 MAIN HEAT EXCHANGER
1. Drain the primary circuit.
2. Remove the electrode leads, noting their positions as
described in section 13.2.
3. Remove the valve and fan assembly as described in Section
13.3.
4. Examine the gasket and replace if necessary.
5. Undo the four nuts securing the burner door and remove the
cover plate from the heat exchanger.
6. Remove the two clips from the flow and return pipes on the
bottom of the heat exchanger and slide out the pipes (Fig. 68).
7. Remove the clip holding the manual air vent and remove the
pipe from the top of the heat exchanger.
8. Remove the four screws holding the left and right hand
retaining brackets and remove the brackets.
9. Remove the four screws securing the flue to the top of the
boiler. Lift the flue adaptor out of the flue outlet in the top of
the heat exchanger.
10. Carefully slide the heat exchanger out of the boiler.
11. Reassemble in reverse order.
751262 MANUAL 19/10/10 08:41 Page 12

13.0 CHANGING COMPONENTS
13.12 AUTOMATIC AIR VENT
1. Drain the primary circuit and rotate the automatic air vent
1/4 turn and remove from the pump body.
2. Examine the ‘O’ ring seal, replacing if necessary, and fit it to
the new automatic air vent.
3. Reassemble in reverse order.
36
© Dimplex Boilers 2008
13.13 PRESSURE GAUGE
1. Drain the primary circuit and undo the nut on the pressure
gauge capillary.
2. Examine the ‘O’ ring seal, replace if necessary.
3. Unclip the facia from the control box
4. Lever the barbs securing the gauge to remove the gauge
from the control box (Fig. 64).
5. Reassemble in reverse order.
13.14 PRESSURE RELIEF VALVE
1. Drain the primary circuit.
2. Disconnect the discharge pipe from the valve. Ease off the
retaining clip (Fig. 66).
3. Note the orientation of the valve, rotate it and withdraw it
from the manifold.
4. Fit the new valve and ‘O’ ring and set to the previously
noted orientation. Reassemble in reverse order.
Fig. 64
Fig. 65
Fig. 66
Automatic Air Vent
‘O’ Ring
Pressure Gauge
Pressure
Relief Valve
Retaining Clip
‘O’ Ring
Discharge Pipe
Capillary
‘O’ Ring
‘O’ Ring
7.0 SITE REQUIREMENTS
7.1 LOCATION
1. The boiler may be fitted to any suitable wall with the flue
passing through an outside wall or roof and discharging to
atmosphere in a position permitting satisfactory removal of
combustion products and providing an adequate air supply. The
boiler should be fitted within the building unless otherwise
protected by a suitable enclosure i.e. garage or outhouse. (The
boiler may be fitted inside 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
13
7.2 CLEARANCES
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
2.5°
5mm Min
446mm
5mm Min
796mm
200mm
200mm
5mm Min
5mm Min
285mm Wall 285mm Wall
Fig. 11
Fig. 12
751262 MANUAL 19/10/10 08:41 Page 13

7.0 SITE REQUIREMENTS
7.3 VENTILATION OF COMPARTMENTS
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.
14
© Dimplex Boilers 2008
7.4 GAS SUPPLY
1. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891. In IE this is the
current edition of I.S. 813 “Domestic Gas Installations”.
2. The connection to the appliance is 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.
NOTE:
The completed installation should always be tested
for gas tightness
7.5 ELECTRICAL SUPPLY
1. External wiring must be correctly earthed, polarised and in
accordance with relevant regulations/rules. In GB this is the
current I.E.E. Wiring Regulations. In IE reference should be
made to the current edition of the ETGI rules.
2. The mains supply is 230V - 50Hz fused at 3A
NOTE:
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.
Fig. 13
Gas Service
Cock
13.0 CHANGING COMPONENTS
13.10 PUMP - HEAD ONLY
1. Drain the primary circuit and disconnect the wiring
connector from the pump head.
2. Remove the four socket head screws securing the pump
head to the body and draw the head away (Fig. 62).
3. A replacement Grundfos 15-60 head can now be fitted
(Fig. 62)(Part No: 500672).
4. Reassemble in reverse order.
5. Replace the wiring connector into the socket on the pump
head.
© Dimplex Boilers 2008
35
13.11 HYDROBLOCK
1. Drain the primary circuit.
2. Remove the stainless clip at the base of the hydro-block and
disconnect the pipe (Fig. 63).
3. Un-lock the locking clip on the return port.
4. Disconnect the discharge pipe from the pressure relief valve.
5. Remove the two securing screws from below the boiler.
6. Carefully remove the hydro-block and change the relevant
components.
7. Reassemble in reverse order taking care to replace all the
clips correctly. Ensure the locking clip is in the ‘Locked’
position as shown opposite.
Pump Head
Front
Stainless Clip
Rear
Stainless Clip
Un-Locked
(viewed from pipe end)
Locked
(viewed from pipe end)
X 2
Fig. 62
Fig. 63
751262 MANUAL 19/10/10 08:41 Page 14

13.0 CHANGING COMPONENTS
13.6 FLUE/HEAT TEMPERATURE THERMOSTAT
1. Disconnect the electrical plug.
2. Turn the sensor 90° anticlockwise to remove - it is a
bayonet connection (Fig. 60).
3. Reassemble in reverse order.
34
© Dimplex Boilers 2008
13.7 THERMAL FUSE
1. The thermal fuse is non-changeable. If the fuse fails contact
Dimplex Technical Department.
13.8 CENTRAL HEATING FLOW TEMPERATURE THERMISTOR
1. Disconnect the electrical plug.
2. Ease the sensor clip away from the pipe and remove (Fig. 61).
3. Reassemble in reverse order.
13.9 CENTRAL HEATING RETURN TEMPERATURE THERMISTOR
1. Disconnect the electrical plug.
2. Ease the sensor clip away from the pipe and remove (Fig. 61).
3. Reassemble in reverse order.
0
1
2
bar
3
4
Fig. 60
Fig. 61
‘O’ Ring
Thermal Fuse
Central Heating Flow
Temperature Thermistor
Central Heating Return
Temperature Thermistor
Flue/Heat Temperature
Thermostat
7.0 SITE REQUIREMENTS
7.6 CONDENSATE DRAIN
NOTE:
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.
BS 6798:2000 & Part HI of the Building Regulations give
further guidance.
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.
It is advisable
t
to keep the condensate pipe internal.
6.
External runs greater than 3 metres or runs in cold areas
sho
u
uld use 32mm waste pipe.
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].
WARNING:
There must be no air breaks in the condensate
pipework or drainage system (see Fig. 17).
© Dimplex Boilers 2008
15
50mm per metre of pipe run
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
NOT ALLOWED
There should be
no air gap
Fig. 14
Fig. 15
Fig. 17
Fig. 16
751262 MANUAL 19/10/10 08:41 Page 15

7.0 SITE REQUIREMENTS
7.7 FLUE
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.
IMPORTANT:
• Only
ONE
of 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.
16
© Dimplex Boilers 2008
NOTE: The minimum distance from a flue terminal to a boundary line is 300mm.
If fitting a plume div
e
erter kit, the air inlet should be a minimum of 100mm from
any opening windows or doors.
NOTE A: A terminal should
be no closer than 150mm
to an opening in the
brickwork intended to
accommodate a fitt
i
ing
such as a window frame.
NOTE: Fitting of the deflector
elbow is recommended when
installing boil
e
er to minimum
clearance of 25mm as
detailed in positions O & P.
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
Position Description Minimum Distance (mm)
A Horizontally to an opening, air brick, opening window - see note A 300
B Above an opening, air brick, opening window etc. - see note A 300
C Below an opening, air brick, opening window etc. - see note A 300
D Below windows or openings on pitched roofs 2000
E Adjacent to windows or openings on pitched and flat roofs 600
F From an adjacent opening window (vertical only) 1000
G From an adjacent wall to flue (vertical only) 300
H Horizontally from a terminal on the same wall 300
J Vertically from a terminal on the same wall 1500
K From an opening in a carport (e.g. door, window) into the dwelling 1200
L From a terminal facing a terminal (horizontal flue) 1200
From a terminal facing a terminal (vertical flue) 600
M From 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
TERMINAL POSITION
Fig. 18
Fig. 19
13.0 CHANGING COMPONENTS
13.4 BURNER
1. Remove the valve and fan assembly as described in Section
13.3.
2. Examine the gasket and replace if necessary.
3. Undo the four nuts securing the burner door and remove
from the heat exchanger.
4. Slowly withdraw the burner from the burner plate taking
care not to damage the insulation (Fig. 58).
5. Reassemble in reverse order.
© Dimplex Boilers 2008
33
13.5 INSULATION
1. Remove the electrode leads, noting their positions. Remove
the electrodes as described in section 13.2.
2. Remove the valve and fan assembly as described in Section
13.3.
3. Examine the gasket and replace if necessary.
4. Undo the four nuts securing the burner door and remove
from the heat exchanger.
5. Slowly withdraw the burner from the burner door.
6. Replace the insulation if necessary.
7. Check the burner door seals.
8. The rear insulation is retained by a screw and large washer,
remove these and draw the insulation out of the heat
exchanger (Fig. 59).
9. Reassemble in reverse order.
Burner
Insulation
Gasket
Air/Gas Channel
Rear Insulation
Washer
Insulation
Retaining Screw
Burner Assembly
Burner Door
Burner Door Seal
Fig. 58
Fig. 59
Inner Seal
751262 MANUAL 19/10/10 08:41 Page 16

13.0 CHANGING COMPONENTS
13.3 GAS VALVE AND FAN
1. Disconnect the two leads to the fan and one lead to the gas
valve.
2. Undo the nut on the gas inlet pipe to the valve and retain
the sealing washer.
3. Remove the three securing screws holding the air/gas
Channel to the burner door plate and remove the valve and fan
assembly (Fig. 57).
4. Remove the three screws holding the valve and swirl plate
to the fan adaptor plate.
NOTE:
Mark on the adaptor plate which holes are being
used by the screws. Using the wrong holes on
re-assembly will cause mis-alignment of the gas valve.
Fan Only
6. Remove the three screws holding the fan adaptor to the fan.
7. Remove the four screws securing the fan to the air/gas
channel. Reassemble in reverse order ensuring all seals are in
place.
NOTE:
The gas valve throttle should be adjusted in
accordance with the instructions supplied in the spares kit
See Section 10.
32
© Dimplex Boilers 2008
Fig. 57
Swirl Plate
Fan
Fan Gasket
Burner Door
Air/Gas Channel
Fan Adaptor Plate
Injector Plate
Injector
Injector ‘O’ Ring
Gas Valve
8.0 FLUE OPTIONS
8.1 CONCENTRIC AIR/FLUE DUCT SPECIFICATIONS
The Dimplex System 18 & Dimplex System 30 boilers can be
installed to a number of different concentric flue systems. The
different flue applications as 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.
Note:
Dimplex System 18 only, with maximum concentric
flue length of 10m, the heat input will be reduced by 7.6%
© Dimplex Boilers 2008
17
8.2 Kit A + Telescopic Horizontal Wall Terminal
(C13) - Part No. 956120
Traditional concentric flue system, Fig. 21, with a maximum
length of 10000mm. The flanged flue elbow is designed with a
3° slope towards the appliance so that the condensate can
easily drain off. It has to be considered that for every metre
horizontal flue length the terminal exit centreline is approx.
45 mm higher than the elbow’s centreline.
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.
8.3 Kit B Vertical Concentric Flue Terminal
(C33) - HBL Part 956081
Standard concentric (100/60) vertical flue application, Fig. 22,
through roof attics with a maximum length of 12000mm.
The kit comprises of the roof terminal, flashing kit, 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
Flue system application
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
2.5° - 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
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
Fig. 20
Fig. 21
Fig. 22
751262 MANUAL 19/10/10 08:41 Page 17

8.0 FLUE OPTIONS
8.5 Kit C Horizontal Anti-Plume Flue Kit
(C13) - Part No. 956084
If the standard horizontal terminal is likely to cause nuisance to
a neighbour or buildings, because of excess pluming, then this
particular flue kit raises the flue gas outlet point to a higher
elevation with the minimum amount of changes. The flue gas
duct is teed-off from the concentric part and covered by an
80mm outer tube to protect the flue duct from freezing. The
air in-take remains at the lower level (see Fig. 24).
If choosing this option then the external flue duct length
should be taken into account when calculating equivalent flue
length.
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 provided to assist in fitting a condensing boiler with
reduced clearances when fitted in good practice according to
the Guide to Condensing Boiler Installation published by
DEFRA/HMSO.
This kit allows the boiler f
l
lue outlet to be directed to the left
or to the right only.
Suitable for installations if the appliance cannot be repositioned
and where other horizontal flue options may cause some
nuisance to neighbours or buildings. The flue kit contains some
additional 45° elbows and extension 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.
18
© Dimplex Boilers 2008
8.6 Plume Diverter Terminal Kit
Part No. 956103
8.7 Kit D External Vertical Flue
(C33) - Part no. 956085
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.
Standard horizontal flue
adaptor has an already
built-in fall in the flue to
allow the condensate to
drain away.
93 flanged elbow (concentric)
with sampling point
Max. lengths (from top of
boiler to AIR COWL 8m
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
2.5-3° fall towards the boiler.
External vertical flue kit - Part no. 956085
Roof terminal
with rain cover.
Roof terminal
with rain cover
and pitched roof
flashing kit. b
a
8.4 Offset Vertical Flue Terminal
(C33) - HBL Part 956081
‘a’ measured from boiler flue outlet centre line to the centre
line of the extension elbow.
‘b’ measured from the top of the boiler to the underside of the
air cowl.
Maximum allowable length of a + b = 8900mm
Fig. 23
Fig. 24
Fig. 25
Fig. 26
13.0 CHANGING COMPONENTS
IMPORTANT:
When changing components ensure that both
the gas and electrical supplies to the boiler are isolated
before any work is started.
See Section 12 : “Annual Servicing” for removal of case, panel,
door etc.
© Dimplex Boilers 2008
31
13.1 IGNITER
1. Disconnect the two feed wires, earth wire and electrode
lead noting their positions (Fig. 53).
2. Undo the two screws securing the igniter to its bracket and
remove the igniter. Reassemble in reverse order.
13.2 SPARK AND SENSING ELECTRODES
1. Disconnect the electrode leads, noting their positions
(Fig. 56).
2. Using a 3mm Hex key, remove the retaining screws securing
each of the electrodes to the burner door and remove the
electrodes.
3. Check the condition of the sealing gaskets and replace if
necessary. Reassemble in reverse order and then check that
the electrode gaps are as shown in Fig. 54 & 55.
Fig. 53
Fig. 54
Fig. 55
Fig. 56
Igniter
Gasket
6mm ± 0.5
to Burner
4mm ± 0.5
10mm ± 0.5
751262 MANUAL 19/10/10 08:41 Page 18

12.0 SERVICING AND MAINTENANCE
12.1 ANNUAL SERVICING
8. Remove the two screws securing the front panel to the
underside of the boiler. Lift the panel upwards off its retaining
studs on top of the appliance.
9. Disconnect the two leads to the fan and one lead to the gas
valve.
10. Undo the nut on the gas inlet pipe to the valve and retain
the sealing washer.
11. Remove the four nuts holding the burner door plate and
remove the valve and fan assembly (Fig. 51).
12. Clean any debris from the heat exchanger using a soft
brush and check that the gaps between the tubes are clear.
13. Inspect the burner, electrode positions and insulation,
cleaning or replacing if necessary.
14. Check the condition of the burner door seals, replacing if
necessary.
15. Reassemble in reverse order.
16. Complete the relevant Service Interval Record section of
the Benchmark Commissioning Checklist at the rear of this
publication and then hand it back to the user.
30
© Dimplex Boilers 2008
Fig. 51
Fig. 49
Fig. 50
Fig. 52
Gas Inlet Nut
Front Panel
Retaining Stud
X 4
X 2
X 2
Burner Door Seal
Inner Seal
8.0 FLUE OPTIONS
8.8 Kit E Chimney Flue Liner Kit
(B23) - Part no. 956082
This kit is suitable for open flue application in accordance with
BS5440 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). Where an open flue system is
used, then an air vent must be provided in the same room or
internal space as the flue duct air inlet, see section 7.3.
For installation details refer to the flue kit instructions.
Maximum flue resistive length = 30m.
A flue system can be built up from the components detailed in
table 8.10, but the total flue resistance must not exceed the
maximum stated.
© Dimplex Boilers 2008
19
8.9 Kit F: Twin Flue System
(C53) - Part no. 956080
This flue system kit is designed for installations where the air
intake position is different than the flue duct exit point. The kit
comprises of a twin adaptor 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 has to be noted that the flue duct is under pressure when
the appliance is in operation and the duct can leak poisonous
carbon monoxide if the duct components are not correctly
assembled. It is
not
recommended 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.
For C53 flue systems the terminal for the supply of
combustion air and for the evacuation of combustion products
shall not be installed on opposite walls of the building.
Maximum flue resistance permitted for a twin flued system
= 52 Pa
Minimum flue resistance permitted for a twin flued system
= 23.5 Pa
Centralising brackets
Chimney terminal
93 flanged elbow (concentric)
with sampling point
Ø60/100mm concentric
chimney adaptor pipe.
In replacement installations,
the chimney has to be
cleared of debris and
all flue parts.
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
Flue Component Flue Resistance (Pa) Part Number
Twin Flue Adaptor (required) 9.5 -
Air Inlet Terminal (required) 3 -
Chimney Terminal (required) 0.5 -
80 mm dia straight duct 1 metre 1 956101
80 mm dia straight duct 2 metre 2 956102
90° Elbow (80/80) 8 956100
45° Elbow (80/80) 4 956099
A flue system can be built up from the components detailed in the table, but the total flue
resistance must not exceed the maximum stated.
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 passes
through habitable rooms
within the same dwelling,
the flue pipe must be
routed through vented
ducts.
The flue resistance for the
following accessories has
to be considered.
Ø80mm flue extension
90 elbow
45 elbow
Split pipe vertical
flue outlet kit -
Part no. 956080
Kit F
!
Fig. 27
Fig. 28
751262 MANUAL 19/10/10 08:41 Page 19

8.0 FLUE OPTIONS
8.10 FLUE LENGTHS
Length supplied in standard kit - horizontal 815mm
Max horizontal length (from boiler to chimney - 60/100mm) 2000mm
Min horizontal length (from boiler to chimney - 60/100mm) 100mm
Max vertical length (from boiler to chimney - 60/100mm) 2000mm
Min vertical length (from boiler to chimney - 60/100mm) 200mm
Length supplied in standard kit - vertical (available in 10m, 20m an 30m length) N/A
Flexitube must be purchased as an accessory to complete the kit (see below)
Flexitube min length 5m
Flexitube max length 30m
Accessories
Description Part No. Equivalent Length
Horizontal - 60/100 Accessories
Flue extension duct - 500mm 956092 450mm
Flue extension duct - 1000mm (incl. 1 x support bracket) 956093 950mm
93° extension elbow 956091 1550mm
45° extension elbow (pair) 956090 775mm
Air inlet duct - included in kit N/A N/A
Straight adaptor (60/80) - included in kit N/A N/A
91.5° adaptor elbow (80/80) - included in kit N/A N/A
Support bracket - 100mm 840517 N/A
93° flanged elbow - included in kit 956082 N/A
Vertical turret socket 956087 N/A
Vertical - Accessories
Flexi tube - 10m 956110 10m
Flexi tube - 20m 956111 20m
Flexi tube - 30m 956112 30m
Straight duct (80) - included in kit N/A N/A
Chimney terminal - included in kit N/A N/A
Note: Equivalent length information only required for coaxial flue parts.
The corrugated (Flexi tu
b
be) flue parts are fixed and all parts are required for every application.
20
© Dimplex Boilers 2008
8.11 Additional Concentric Flue Kit Accessories
The following additional concentric kit accessories are available
as optional extras.
Flue Extension Ducts - 1000 mm (956093) and 500 mm
(956092), (each duct extends the flue length by up to 950
mm and 450 mm respectively).
93° Extension Elbow (956091) - Allows an additional bend in
the flue, and has an ‘equivalent length’ of 1550 mm. This
elbow is mechanically different from the flanged elbow
supplied as standard with the appliance, but has the same
equivalent length.
45° Extension Elbow (956090) - Allows an additional bend in
the flue and has an ‘equivalent length’ of 775 mm.
Vertical Turret Socket (956087) - For use with elevated
horizontal flues and vertical terminals.
Vertical Roof Terminal - For use where an external wall is not
available, or where it is desirable to route the ducts vertically.
For installation details refer to the instructions provided with
the individual flue kits.
These optional kits may be used with the standard flue kits to
produce an extensive range of flue options, providing that the
following rules are strictly obeyed.
a) The maximum/minimum permissible length of the room
sealed flue system are:
Horizontal flue terminal (all orientations)
maximum 10000 mm
Horizontal flue terminal (rear exit)
minimum 250 mm
Vertical flue terminal maximum 12000 mm
Vertical flue terminal minimum 600 mm
The ‘equivalent’ flue length must not exceed the maximum
values stated.
b) The standard terminal must be fitted horizontally; horizontal
ducts must have a continuous fall towards the appliance of
1.5° to 3°. This ensures condensate runs back into the
appliance from the flue system. The vertical terminal must
always be used if a vertical outlet is required.
c) The concentric flue system must use either a flanged elbow
or a vertical flue turret socket at the entry/exit to the
appliance.
d) All joints must be correctly made and secured in accordance
with the installation instructions. When cutting ducts, avoid
swarf, uneven and sharp edges to maintain duct integrity.
Refer to Fig. 19 & 20 to determine which option kits are
required before commencing the installation. Instructions for
installing the appliance with a horizontal flue and straight
extension ducts are included in the main text of these
instructions (section 9.5).
12.0 SERVICING AND MAINTENANCE
12.2 COMBUSTION CHECKS
COMBUSTION CHECKS AT MAXIMUM RATE
9. Set the boiler to Maximum gas rate.
10. Check the Carbon Monoxide (CO) and Carbon Dioxide (CO2)
readings are within the range quoted in the tables opposite
(Table 2).
11. If the combustion value(s) is outside the values specified
in Tables 1 and 2 and the integrity of the full flue system and
combustion circuit seals, the inlet gas pressure and gas rate
have been verified, it is possible to make an adjustment to the
combustion settings by adjustment of the air/gas ratio valve.
See Section 12.3 Adjustment of the Gas Valve.
© Dimplex Boilers 2008
29
12.3 ADJUSTMENT OF THE GAS/AIR RATIO VALVE
COMBUSTION SETTING ADJUSTMENT
1. It is only possible to adjust the valve at Maximum rate. No
adjustment at Minimum rate is allowed.
2. If the maximum rate setting is adjusted, then the
combustion values must be checked at minimum rate.
NOTE:
DO NOT ATTEMPT TO ADJUST THE GAS/AIR RATIO
VALVE UN LE S S ;
• The person carrying out the measurement has been
assessed as competent in the use of a flue gas analyser
and the interpretation of the results.
• The flue gas analyser used, meets the requirements of
BS7927 or BS-EN50379-3.
• The flue gas analyser is calibrated in accordance with the
manufacturers requirements.
3. At Maximum Gas Rate; put the appliance into Service Mode
at Maximum Gas Rate (see Section 11.2).
4. Wait 5 minutes to allow the boiler to stabilise.
5. If the Carbon Dioxide (CO2) level is outside the required
values given in Section 12.2 (Table 2) then adjust the throttle
screw (Fig. 48) until the CO2is at the correct setting level. See
Table 4. Clockwise to decrease CO2, anti-clockwise to increase
CO2.
NOTE:
Only turn the throttle in small steps of
no more than
1/8th of a turn
and wait 1 minute after each adjustment for
the combustion reading to stabilise.
IMPORTANT:
After any adjustment of the gas valve, it is
essential to check the combustion levels at minimum gas
rate (Table 1). If the Carbon Monoxide or Carbon Dioxide
levels are outside the range quoted, call Dimplex Boilers Ltd
Technical Helpline on 0844 3711121. If in doubt ASK!
Table 4
Fig. 48
NOTE:
Factory set - warranty
void if adjusted
Throttle Adjuster Screw
Gas Valve
Inlet Test Point
Carbon Dioxide (CO2) acceptable setting level at Maximum
Gas Rate after 5 minutes operation
Natura
l
lGas %Boiler Model
System 18
9.0 11.0
System 30
9.0 10.7
LPG (Propane) %
751262 MANUAL 19/10/10 08:41 Page 20