IDEAL LOGIC+ SYSTEM2 S15 User guide

When replacing any part on this appliance, use only spare parts that you can be assured conform to the safety and performance
specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised by Ideal Heating.
For the very latest copy of literature for specification and maintenance practices visit our website idealheating.com
where you can download the relevant information in PDF format.
July 2022
UIN 228294 A02
INSTALLATION
& SERVICING
LOGIC+ SYSTEM2
S15 S18 S24 S30

2
Installation and Servicing
ERP DATA
The code of practice for the installation,
commissioning & servicing of central
heating systems
WEEE DIRECTIVE 2012/19/EU
Waste Electrical and Electronic Equipment Directive
• At the end of the product life, dispose of the
packaging
and product in a corresponding recycle centre.
• Do not dispose of the unit with the usual domestic refuse.
• Do not burn the product.
• Remove the batteries.
• Dispose of the batteries according to the local statutory
requirements and not with the usual domestic refuse.
 
SYMBOL UNITS 15 kW 18 kW 24 kW 30 kW
Condensing Boiler n/a n/a yes yes yes yes
Low Temperature Boiler n/a n/a no no no no
B1 Boiler n/a n/a no no no no
Cogeneration Space Heater n/a n/a no no no no
Equipped with a Supplementary Heater n/a n/a no no no no
Combination Heater n/a n/a no no no no
Nominal Heat Output for Space Heating
Full Load P4 kW 15.1 18.1 24.3 30.3
Part Load P1 kW 4.9 5.9 8.0 9.9
Auxiliary Electricity Consumption
Full Load elmax kW 0.020 0.025 0.044 0.052
Part Load elmin kW 0.003 0.023 0.012 0.012
Standby PSB kW 0.002 0.002 0.002 0.001
Seasonal Space Heating Energy E󰀩ciency
Full Load ƞ4 % 90.0 90.0 90.0 89.6
Part Load ƞ1 % 97.8 98.5 98.6 98.2
Standby Loss Pstby kW 0.05 0.05 0.05 0.05
Ignition Pign kW 0 0 0 0
Emissions NOx (Gross) NOx, pond Hs mg/kWh 21 24 28 26
Annual Energy Consumption QHE GJ 47 56 75 93
Sound Power Level, Indoors LWA dB 42 44 50 50
SYMBOL UNITS MODEL
15 kW 18 kW 24 kW 30 kW
Condensing boiler Yes
Seasonal space heating e󰀩ciency class A
Rated heat output kW 15 18 24 30
Seasonal space heating energy e󰀩ciency ƞs % 93 93 94 93
Annual energy consumption QHE GJ 47 56 75 93
Sound power level, indoors LWA dB 42 44 50 50

3
Installation and Servicing
LOGIC+ SYSTEM2S BOILER
Ideal Heating ERP DATA
Seasonal Space Heating Energy E󰀩ciency of the Boiler *%
Temperature control (from che of temperature control) %
Class I Class II Class III Class IV Class V Class VI Class VII Class VIII
1% 2% 1.5% 2% 3% 4% 3.5% 5%
PRODUCT FICHE
 
The energy e󰀩ciency of the package of products provided for in this document may not correspond to its actual energy e󰀩ciency once
installed in a building, as the e󰀩ciency is inuenced by further factors such as heat loss in the products in relation to the building size and its
characteristics
Collector Size
(in m2)
Tank Volume
(in m3)
Collector
E󰀩ciency
(in %)
Tank rating
A* = 0.95
A = 0.91
B = 0.86
C = 0.83
D-G = 0.81
Solar Contribution (from che of solar device)
Seasonal Space Heating Energy E󰀩ciency of Package TOTAL: A+B+C=
Seasonal Space Heating Energy E󰀩ciency Class of Package
= (‘III ’x + ‘IV ’ x ) x 0.9 x ( / 100 x ) = %
%
GG F E D C B A A+ A++ A+++
< 30% ≥ 30% ≥ 34% ≥ 36% ≥ 75% ≥ 82% ≥ 90% ≥ 98% ≥ 125% ≥ 150%
A
B
C
94%
SYMBOL UNITS MODEL
15 kW 18 kW 24 kW 30 kW
Condensing boiler Yes
Seasonal space heating e󰀩ciency class A
Rated heat output kW 15 18 24 30
Seasonal space heating energy e󰀩ciency ƞs % 93 93 94 93
Annual energy consumption QHE GJ 47 56 75 93
Sound power level, indoors LWA dB 42 44 50 50

4
Installation and Servicing
Ideal Heating reserve the right to vary specication without notice
DEFINITIONS
IMPORTAN T: Important information
For any technical queries please ring the Ideal installer helpline : 01482 498663
BOILER RESTART PROCEDURE -
Press the RESTART button. The boiler will repeat the ignition sequence if a heat demand is present.
NOTES FOR THE INSTALLER
WARNING: Risk of injury or death
CAUTION: Risk of damage to objects
Table of Acronyms
CH - Central Heating
DHW - Domestic Hot Water
TRV - Thermostatic Radiator Valve
PRV - Pressure Relief Valve
IE - Ireland
ETCI - Electro-Technical Council of Ireland
BS - British Standard
WRAS - Water Regulations Advisory Scheme
SAP - Standards Assessment Procedure
IEE - Institution of Electrical Engineers
UKCA - UK Conformity Assessed
RHS - Right Hand Side
LHS - Left Hand Side
PCB - Printed Circuit Board

5
Installation and Servicing
Section 1 - General..................................................................................... 6
1.1 Introduction................................................................................... 8
1.2 Operation...................................................................................... 8
1.3 Safe Handling ............................................................................... 8
1.4 Optional Accessories .................................................................... 8
1.5 Safety............................................................................................ 8
1.6 Safe Handling of Substances ....................................................... 9
1.7 Location of Boiler ......................................................................... 9
1.8 Air Supply.................................................................................... 10
1.9 Gas Supply ................................................................................. 10
1.10 Water Circulation System ........................................................... 10
1.11 Boiler Controls ............................................................................ 10
1.12 Electrical Supply ......................................................................... 10
1.13 Condensate Drain....................................................................... 10
1.14 Boiler Dimensions, Services & Clearances .................................11
1.15 System Requirements - Central Heating .................................... 12
1.16 System Balancing....................................................................... 13
1.17 Water Treatment ......................................................................... 13
Section 2 - Installation .............................................................................. 14
2.1 Boiler Assembly - Exploded View ............................................... 14
2.2 Unpacking................................................................................... 15
2.3 Wall Mounting Template.............................................................. 16
2.4 Preparing the Wall ...................................................................... 16
2.5 Fitting the Wall Mounting Plate ................................................... 16
2.6 Mounting the Boiler..................................................................... 16
2.7 Flues and Locations.................................................................... 17
2.8 Flues and Locations - Continued................................................ 18
2.9 Horizontal Flue Positions ........................................................... 19
2.10 Vertical Flue Positions ............................................................... 19
2.11 Flue System Dimensions ........................................................... 20
2.12 Fitting the Turret.......................................................................... 20
2.13 Cutting the Flue .......................................................................... 21
2.14 Assembling the Vertical Flue ...................................................... 22
2.15 Condensate Drain....................................................................... 23
2.16 Condensate Drain - Continued................................................... 24
2.17 Connections & Filling.................................................................. 25
2.18 Electrical Connections ................................................................ 25
2.19 Installer Wiring............................................................................ 26
2.20 Installer Wiring Continued........................................................... 27
2.21 ReplacingPre-ttedMainsCable ............................................... 27
2.22 Electrical Controls....................................................................... 27
2.23 Wiring Diagram........................................................................... 28
2.24 Commissioning and Testing........................................................ 29
2.25 Initial Lighting.............................................................................. 30
2.26 User Interface Commissioning.................................................... 31
2.27 Changing Boiler Operating Mode .............................................. 31
2.28 Menu Operation.......................................................................... 32
2.29 Maximum and Minimum Rates ................................................... 32
2.30 General Checks.......................................................................... 33
2.31 Restart Procedure....................................................................... 34
2.32 Handing Over.............................................................................. 34
Section 3 - Servicing................................................................................. 35
3.1 Servicing Schedule..................................................................... 35
3.2 Removal / Replacement of Components.................................... 36
3.3 Draining the Boiler ...................................................................... 36
3.4 Boiler Front Panel Removal / Replacement................................ 37
3.5 Flue Manifold Removal/Replacement......................................... 37
3.6 Fan and Venturi Assembly Removal and Cleaning..................... 38
3.7 Burner Removal and Cleaning.................................................... 39
3.8 Cleaning the Heat Exchanger..................................................... 39
3.9 Ignition / Detection Electrode Replacement / Inspection ............ 40
3.10 Cleaning the Condensate Trap................................................... 40
3.11 Burner Injector Replacement...................................................... 41
3.12 Burner Replacement................................................................... 41
3.13 Return Thermistor Replacement................................................. 41
3.14 Spark Generator Replacement................................................... 42
3.15 Gas Control Valve Replacement................................................. 42
3.16 Condensate Trap Replacement / Cleaning................................. 42
3.17 Pressure Gauge Replacement ................................................... 43
3.18 PRV Replacement ...................................................................... 43
3.19 Primary PCB Replacement......................................................... 44
3.20 Pump Automatic Air Vent Replacement ..................................... 45
3.21 Pump Head Replacement........................................................... 45
3.22 CH Water Pressure Switch Replacement................................... 46
3.23 Flow Thermistor Replacement.................................................... 46
3.24 Expansion Vessel Recharging & Replacement .......................... 47
3.25 Heat Engine Replacement.......................................................... 48
Section 4 - Fault Finding........................................................................... 49
4.1 Main Menu, Fault Help................................................................ 49
4.2 Overheat Lockout ....................................................................... 49
4.3 Ignition Lockout........................................................................... 50
4.4 Flame On Before Gas Valve On ................................................. 50
4.5 Low Water Pressure ................................................................... 50
4.6 Flame Loss ................................................................................. 51
4.7 Fan Fault..................................................................................... 51
4.8 Flow Thermistor Fault ................................................................ 52
4.9 Return Thermistor Fault ............................................................. 52
4.10 Outside Sensor Fault.................................................................. 53
4.11 No CH Operation........................................................................ 53
4.12 No DHW Operation..................................................................... 54
4.13 No Display .................................................................................. 54
Section 5 - Spare Parts ............................................................................ 55
Section 6 - Benchmark & Commissioning ................................................ 56
CONTENTS

6
Installation and Servicing
Section 1 - General
Table 2 Performance Data - Central Heating
Boiler Input: 15 kW 18 kW 24 kW 30 kW
Min Max Min Max Min Max Min Max
Net CV kW 4.9 15.1 4.9 18.1 4.9 24.3 6.1 30.4
Gross CV kW 5.4 16.6 5.4 20.1 5.4 27.0 6.7 33.7
Gas Consumption m3/h 0.500 1.537 0.500 1.872 0.500 2.512 0.623 3.136
Boiler Output :
Non Condensing
70ºC Mean Water Temp. kW 4.8 15.0 4.8 18.0 4.8 24.2 6.1 30.3
Condensing
40ºC Mean Water Temp. kW 5.1 15.9 5.1 19.1 5.1 25.6 6.4 31.0
Seasonal E󰀩ciency* SEDBUK 2005 91.2% 91.1% 91.2% 91.1%
Seasonal E󰀩ciency* SEDBUK 2009/2012 89.4% 89.7% 89.7% 89.6%
NOx Classication Class 6
Table 1 General Data
Gas consumption is calculated using a caloric value of
38.7 MJ/m3 (1038 Btu/ft3) gross or 34.9 MJ/m3 (935 Btu/ft3) nett
To obtain the gas consumption at a di󰀨erent caloric value:
a. For l/s - divide the gross heat input (kW) by the gross C.V. of
the gas (MJ/m3)
b. For Btu/h - multiply the gross heat input (kW) by 26.8
c. For ft3/h - divide the gross heat input (Btu/h) by the gross C.V.
of the gas (Btu/ft3)
d. For m3/h - multiply l/s by 3.6
C13 C33 C53 = A room sealed appliance designed for
connection via ducts to a horizontal or vertical
terminal, which admits fresh air to the burner and
discharges the products of combustion to the
outside through orices which, in this case, are
concentric. The fan is up stream of the combustion
chamber.
I2H = An appliance designed for use on 2nd family gas, Group H
only .
II2H/3P = An appliance designed for use on 2nd or 3rd family gases,
Group H or P .
* The value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated, has been certied by a notied body.
15 kW 18 kW 24 kW 30 kW
Gas Supply 2H-G20-20 mbar
Gas Supply Connection 15mm copper compression
Injector Size mm 4.15 4.15 4.15 4.65
Flow Connection Central Heating 22mm copper compression
Return Connection Central Heating 22mm copper compression
Flue Terminal Diameter mm 100
Average Flue Temp-Mass Flow Rate 56ºC - 6g/s 58ºC - 8g/s 63ºC - 10g/s 69ºC - 13g/s
CO2Content (± 0.7) Max. CH 9.5% 9.3% 9.2% 9.6%
Min. CH 8.9% 8.3% 8.5% 8.7%
Maximum Working Pressure (Sealed Systems) bar (psi) 2.5(36.3)
Electrical Supply 230 V ~ 50Hz
Power Consumption W 70 75 94 102
Fuse Rating External:3A Internal :T4A HRC L250 V
Water Content Central Heating litre (gal) 1.2(0.26)
Packaged Weight kg 31.3
Lift Weight kg 27.3
Boiler Casing Size Height mm 700
Width mm 395
Depth mm 278
BOILER SIZE G.C. Applicance No
(Benchmark No.)
15 41-796-93
18 41-796-94
24 41-796-95
30 41-796-96

7
Installation and Servicing
Section 1 - General
Boiler Page
Make and model......................................................... 7
Appliance serial no. on data badge .......... Front Cover
SEDBUK No. %.......................................................... 6
Controls
Time and temperature control to heating ................. 27
Time and temperature control to hot water ............. 27
Heating zone valves................................................ n/a
TRV’s........................................................................ 10
Auto bypass ............................................................. 10
Boiler interlock.......................................................... 10
For all boilers
Flushing to BS.7593................................................. 13
Inhibitor .................................................................... 13
Central heating mode
Heat input...................................................to be calculated
For assistance call
Technical Helpline
01482 498663
Page
Burner operating pressure ...................................... n/a
Central heating ow temp. ...........measure and record
Central heating return temp. ........measure and record
For combination boilers only
Scale reducer ........................................................... 13
Hot water mode
Heat input............................................to be calculated
Max. operating burner pressure .............................. n/a
Max. operating water pressure........ measure & record
Cold water inlet temp ...................... measure & record
Hot water outlet temp. ..................... measure & record
Water ow rate at max. setting........ measure & record
For condensing boilers only
Condensate drain................................................23-24
For all boilers: Complete, sign & hand over to customer
For UK, to comply with Building Regulations Part L1 (Part 6 in Scotland) the boiler should be tted in accordance with the
manufacturer’s instructions. Self-certication that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark Commissioning Checklist.
Before installing this boiler, read the Code of Practice sheet at the rear of this book.
BENCHMARK COMMISSIONING CHECKLIST DETAILS
NOTE TO THE INSTALLER: COMPLETE THE BENCHMARK COMMISSIONING CHECKLIST
AND LEAVE THESE INSTRUCTIONS WITH APPLIANCE
Natural Gas Only
Destination Country: GB
LOGIC+ SYSTEM2S
BOILER SIZE G.C. Applicance No
(Benchmark No.)
15 41-796-93
18 41-796-94
24 41-796-95
30 41-796-96

8
Installation and Servicing
Section 1 - General
1.1 INTRODUCTION
The Logic+ System2S range of boilers are wall mounted, full
sequence, automatic spark ignition, low water content, fanned
ue, high e󰀩ciency, condensing, system gas boilers.
Due to the high e󰀩ciency of the boiler a plume of water vapour
will form at the terminal during operation.
The boiler is supplied fully assembled with circulating pump,
pressure gauge, PRV and CH expansion vessel.
A variable CH temperature control is tted on the user control.
The boiler includes as standard:
- Boiler Automatic bypass
- Boiler frost protection
- Daily pump exercise.
The boiler casing is of white painted mild steel with a white
polymer front panel.
The boiler temperature controls are visibly located in the
control panel on the front of the boiler.
The heat exchanger is manufactured from cast aluminium.
The boiler is suitable for connection to fully pumped,
sealed heating systems ONLY. Adequate arrangements for
completely draining the system by provision of drain cocks
MUST be provided in the installation pipework.
Pipework from the boiler is routed downwards.
A PRV grommet is tted to the boiler which requires the
correct tting and securing of a clip (supplied) to ensure safe
discharge of the PRV should this occur.
Data Plate
The boiler model and serial number can be located on the
bottom of the boiler casing, shown in Section 1.14 - Water &
Gas Connection Diagram.
1.2 OPERATION
When there is a demand the system is supplied at the selected
temperature of between 30oC and 80oC.
The boiler features a comprehensive diagnostic system which
gives detailed information on the boiler status when operating,
and performance of key components to aid commissioning and
fault nding.
1.3 SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler
may include the use of a sack truck and involve lifting, pushing
and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions
should be considered:
• Grip the boiler at the base.
• Be physically capable.
• Use personal protective equipment as appropriate, e.g.
gloves, safety footwear.
During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable
and/or the weight is light.
• Keep back straight.
• Avoid twisting at the waist.
• Avoid upper body/top heavy bending.
• Always grip with the palm of the hand.
• Use designated hand holds.
• Keep load as close to the body as possible.
• Always use assistance if required.
1.4 OPTIONAL ACCESSORIES
Please visit idealheating.com to access the optional
accessories for this boiler.
SCAN
for link
1.5 SAFETY
Current Gas Safety (installation and use) regulations or
rules in force:
The appliance is suitable only for installation in UK and should
be installed in accordance with the rules in force.
In UK, the installation must be carried out by a Gas Safe
Registered Engineer. It must be carried out in accordance with
the relevant requirements of the:
• Gas Safety (Installation and Use) Regulations
• Appropriate Building Regulations, either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• Water Fittings Regulations or Water byelaws in Scotland.
• Current I.E.E. Wiring Regulations.
Where no specic instructions are given, reference should be
made to the relevant British Standard Code of Practice.

9
Installation and Servicing
Section 1 - General
The Boiler has been tested and certied to:
BSEN 15502-1, BSEN 15502-2, BSEN 15502-2-1,
BSEN 60335-1, BSEN 60335-2-102, BSEN 55014-1 and
BSEN55014-2 for use with Natural Gas & Propane.
Detailed recommendations are contained in the following
British Standard Codes of Practice:
BS5440:1 Flues (for gas appliances of rated input not
exceeding 70 kW).
BS5440:2 Ventilation (for gas appliances of rated input
not exceeding 70 kW).
BSEN12828 Heating Systems in buildings: Design for water
based heating systems.
BSEN12831 Heating Systems in buildings: Method for
calculation of the design heat load.
BSEN14336 Heating Systems in buildings: Installation
and commissioning of water based heating
systems.
BS5546 Installation of gas hot water supplies for
domestic purposes (2nd Family Gases)
BS6798 Installation of gas red hot water boilers of
rated input not exceeding 70 kW.
BS6891 Installation and maintenance of low pressure
gas installation pipework.
BS 7593:2019 Code of practice for the preparation,
commissioning and maintenance of domestic
central heating and cooling water systems.
Health & Safety Document No. 635.
The Electricity at Work Regulations, 1989.
The manufacturer’s notes must NOT be taken, in any way, as
overriding statutory obligations.
IMPORTAN T: This appliance is UKCA/CE certicated for
safety and performance. Do not connect external control devices
directly to this appliance unless recommended in this manual or
by Ideal Heating in writing. If in doubt, please enquire.
Unapproved control devices could invalidate the warranty of this
appliance and infringe the Gas Safety Regulations.
1.6 SAFE HANDLING OF SUBSTANCES
No asbestos, mercury or CFCs are included in any part of the
boiler or its manufacture.
1.7 LOCATION OF BOILER
The boiler must be installed on a at and vertical internal wall,
capable of adequately supporting the weight of the boiler and
any ancillary equipment.
The boiler may be tted on a combustible wall and insulation
between the wall and the boiler is not necessary, unless
required by the local authority.
WARNING: Rear access to the boiler is not permitted.
CAUTION: Do not t the boiler outside.
Timber Framed Buildings
Boilers installed in a timber-framed building must comply with
IGE/UP7 +A 2008.
Bathroom Installations
CAUTION: This appliance is IP20 rated, do not clean
with jets of water.
You may install the boiler in any internal space. The installation
must comply with the current IEE (BS 7671) Wiring Regulations
and the electrical regulations applicable in Scotland.
If the appliance is to be installed in a room containing a bath or
shower then, the appliance must be installed beyond Zone 2,
as detailed in BS7671.
Compartment Installations
A boiler installed in a compartment does not require
ventilation. However, A boiler installed in a compartment must
provide adequate clearances for servicing.
The compartment should also be tted with a suitable label in
accordance with current standards.
Refer to Section
1.14
Bathroom Installations
[0] Zone 0
[1] Zone 1
[2] Zone 2
[2*] Without the end wall, zone 2 must extend 600 mm from the bath
[A] 600 mm radius from the bath or shower
0010017086-002
2
1
2
12
2
1
600 mm
600 mm
600 mm
2250 mm
2250 mm
2*
A
A
A
600
m
m

10
Installation and Servicing
Section 1 - General
1.10 WATER CIRCULATION SYSTEM
IMPORTAN T: A minimum length of 1 metre of copper
pipe MUST be tted to both ow and return connections from
the boiler before connection to any plastic piping.
The central heating system should be in accordance with
BS6798 and, in addition, for smallbore and microbore systems,
BS5449.
Water treatment is covered later in these instructions.
Refer to Section
1.17
1.11 BOILER CONTROLS
System controls should be installed to ensure the boiler has
no demand when there is no requirement from the system, in
compliance with Building Regulations.
Heating systems utilising full thermostatic radiator valve control
of temperature in individual rooms should also be tted with a
room thermostat controlling the temperature in a space served
by radiators not tted with such a valve.
When thermostatic radiator valves are used, the space
heating temperature control over a living / dining area or
hallway having a heating requirement of at least 10% of the
minimum boiler heat output should be achieved using a room
thermostat, whilst other rooms are individually controlled by
thermostatic radiator valves. However, if the system employs
thermostatic radiator valves on all radiators, or two port valves,
then a bypass circuit must be tted with an automatic bypass
valve to ensure a ow of water should all valves be in the
closed position.
1.12 ELECTRICAL SUPPLY
WARNING: This appliance must be earthed
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS7671) Wiring Regulations and any local
regulations which apply.
The mains supply to the boiler and system wiring centre
shall be through one common fused double pole isolator and
for new heating systems, and where practical replacement
installations, the isolator shall be situated adjacent to the
appliance.
1.13 CONDENSATE DRAIN
The condensate drain provided must be connected to the
drainage point on site. All condensate drainage pipework and
ttings must be made of plastic.
IMPORTAN T: The condensate drain pipework should
be installed in accordance with BS6798.
The drain outlet on the boiler is sized for standard 21.5 mm
overow pipe. It is a universal tting to allow use of di󰀨erent
brands of pipework.
Refer to Section
2.15
1.8 AIR SUPPLY.
It is not necessary to have an air vent in the room or internal
space where the boiler is installed.
1.9 GAS SUPPLY
Consult the local gas supplier to establish an adequate supply
of gas. Do not use existing service pipes without consulting the
local gas supplier.
The gas supply must be governed with a meter.
A gas meter can only be connected by the local gas supplier or
by a Gas Safe Registered Engineer.
An existing meter should be checked, preferably by the gas
supplier, to ensure that the meter is adequate to deal with the
required gas supply rate.
It is the responsibility of the Gas Installer to size the gas
installation pipework in accordance with BS6891.
Whilst the principle of the 1:1 gas valve ensures the Logic
range is able to deliver it is full output at inlet pressures as low
as 14 mb, other gas appliances in the property may not be as
tolerant. When operating pressures are found to be below the
minimum meter outlet of 19 mb these should be checked to
ensure this is adequate for correct and safe operation.
Allowing for the acceptable pressure loss of 1mb across the
installation pipework, it can be assumed that a minimum
permitted operating pressure of 18mb will be delivered to the
inlet of the appliance.
(Reference BS6400-1 Clause 6.2 Pressure Absorption).
The external gas cock could further reduce the operating
pressure when measured at its test point. The pressure drop
is relative to the heat input to the boiler (kW), refer to graph
below.
IMPORTAN T: Ensure all gas valve connections are
gas tight with a gas soundness check up to the gas control
valve.
Installation pipes must be tted in accordance with BS6891.
The complete installation MUST be tested for gas tightness
and purged as described, for the majority of installations the
appropriate standard is IGEM/UP/1B [23], but alternatively
IGEM/UP/1 [21] or IGEM/UP/1A [22], as appropriate, can be
utilized.
Gas Cock Pressure Drop
Heat Input to Boiler (kW)
Pressure Drop (mbar)
0 5 10 15 20 25 30 35 40
1.4
1.2
1
0.8
0.6
0.4
0.2
0

11
Installation and Servicing
Section 1 - General
All measurements in mm
1.14 BOILER DIMENSIONS, SERVICES & CLEARANCES
The boiler connections are made on the boiler connection
tails.
The following minimum clearances must be maintained
for operation and servicing.
Additional space will be required for installation, depending
upon site conditions.
Side and Rear Flue
a. Provided that the ue hole is cut accurately, e.g. with a core
drill, the ue can be installed from inside the building where
wall thicknesses do not exceed 600 mm.
395
Refer to Section
2.17
278
700
100*
Flue
terminal
2.52.5
from case
Underside ViewWater and Gas Connections
CH
Flow
Gas CH
Return
CH Circuit
Drain
Data
Plate
CH
Flow
PRV
Grommet
CH
Return
Gas
Inlet
Cond.
Drain
Cond.
Drain
98
200
152
Front Clearance
The minimum front clearance when built in to a cupboard is
5 mm from the cupboard door but 450 mm overall clearance
is still required, with the cupboard door open, to allow for
servicing.
* Bottom Clearance
Bottom clearance after installation can be reduced to 15 mm.
This must be obtained with an easily removable panel to
provide the 100 mm clearance required for servicing.
For easy access to the pressure gauge a bottom clearance
of 15 mm is required for a partial open door.
PRV Grommet
Refer to Section
2.17
IMPORTAN T: Please ensure there is su󰀩cient
clearance either side and below the boiler, particularly from
door hinges and the base of a cupboard, to allow the door to
be opened to allow the pressure gauge to be checked.
CH Circuit
Drain
PRV
Grommet

12
Installation and Servicing
Section 1 - General
a. The method of lling, relling, topping up or ushing sealed
primary hot water circuits from the mains via a temporary
hose connection is only allowed if acceptable to the local
water authority.
b. Antifreeze uid, corrosion and scale inhibitor uids suitable
for use with boilers having aluminium heat exchangers may
be used in the central heating system.
General
1. The installation must comply with all relevant national and
local regulations.
2. Design the system for ow temperatures up to 80oC.
3. The system components must be suitable for an operating
pressure of 3 bar and a maximum temperature of 110°C.
The following components are incorporated within the
appliance:
a. Circulating pump.
b. PRV, with a non-adjustable preset lift pressure of
3 bar.
c. Pressure gauge, covering a range of 0 to 4 bar.
d. An 8 litre expansion vessel, with an initial charge
pressure of 0.75 bar.
4. Makeup Water. One of the following provisions must be
made for replacing system water loss:
a. Manually lled vessel
The vessel must:
Have a visible water level
Be mounted at least 150 mm above the system’s
highest point
Connect through a non-return valve to the system
Be at least 150 mm below the makeup vessel on the
return side of the radiators
b. System prepressurisation.
The e󰀩ciency of the expansion vessel will be
reduced in a pressurised system; a larger vessel or
smaller system volume may be necessary.
If the vessel’s capacity is not su󰀩cient, an additional
vessel must be installed on the return to the boiler.
If the system is not pressurised, the cold water
capacity must not exceed 143 litres.
Guidance on vessel sizing is given in table above.
1.15 SYSTEM REQUIREMENTS - CENTRAL HEATING
PRV setting bar 3.0
Vessel charge pressure bar 0.5 to 0.75
System pre-charge pressure bar None 1.0
System volume Expansion vessel
(litres) volume (litres)
25 1.6 1.8
50 3.1 3.7
75 4.7 5.5
100 6.3 7.4
125 7.8 9.2
150 9.4 11.0
175 10.9 12.9
190 11.9 14.0
200 12.5 14.7
250 15.6 18.4
300 18.8 22.1
For other system volumes
multiply by the factor across 0.063 0.074
5. Filling
The system may be lled by the following method:
Where the mains pressure is excessive a pressure
reducing valve must be used to facilitate lling.
a. Thoroughly ush out the whole system with cold
water.
b. Fill and vent the system until the pressure gauge
registers 1 bar and examine for leaks
c. Check that a 15 mm diameter pipe is correctly
located and secured (using the clip supplied)
d. Check the operation of the PRV by raising the water
pressure until the valve lifts. This should occur within
0.3 bar of the preset lift pressure.
e. Check no escape of water occurs except at the
discharge point
f. Release water from the system until the
minimum system design pressure is reached;
1.0 bar if the system is to be pre-pressurised.
Model 15 18 24 30
Max CH uutput kW 15 18 24.2 30.3
Water ow rate l/min 10.7 13 17.2 21.5
(gal/min) (2.4) (2.8) (3.8) (4.7)
Temp di󰀨erential oC 20 20 20 20
Head available m.w.g. 5 4.5 3.3 1.9
for system (ft.w.g.) (16.2) (14.7) (10.8) (6.2)
With Ideal System m.w.g.
Filter & Valves (ft.w.g.)
4.9
16
4.3
14.1
3.0
9.8
1.5
4.9
CH Return
Ecl 6053
Hose unions
Mains
water supply
Temporary hose
(disconnect after filling)
Additional
stop valve
Double check valve
assembly
(
note direction of flow )
Table 3 Vessel Sizing
Table 4

13
Installation and Servicing
Section 1 - General
Note. Systems incorporating zone valves which could
completely cut o󰀨 the ow through the system must also
include a bypass.
The boiler does not normally need a bypass but at least
some radiators on the heating circuit, of load of at least 10%
of the minimum boiler output, must be provided with twin
lockshield valves so that this minimum heating load is always
available.
Balancing
1. Set the programmer to ON.
Close the manual or thermostatic valves on all radiators,
leaving the twin lockshield valves (on the radiators
referred to above) in the OPEN position.
Turn up the room thermostat and adjust the lockshield
valve to give an uninterrupted ow through the radiator.
These valves should now be left as set.
2. Open all manual or thermostatic radiator valves and
adjust the lockshield valves on the remaining radiators, to
give around 20oC temperature drop at each radiator.
3. Adjust the room thermostat and programmer to
NORMAL settings.
1.17 WATER TREATMENT
1.16 SYSTEM BALANCING
Central Heating
The Logic range of boilers have an ALUMINIUM alloy heat
exchanger.
IMPORTANT The application of any other treatment
to this product may render the guarantee of Ideal Heating
invalid.
Ideal Heating recommend Water Treatment in accordance
with the Benchmark Guidance Notes on Water Treatment in
Central Heating Systems.
If water treatment is used Ideal Heating recommend only the
use of SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEY MC1,
SENTINEL X100 or CALMAG CM100 inhibitors and associated
water treatment products, which must be used in accordance
with the manufacturers’ instructions.
This boiler can be used with a water softener. However, the
heating system should not be lled with softened water as
any softening chemicals could enhance corrosion of certain
materials inw the heating system, including aluminium and
steel. The heating system should always be lled from the
bypass on the water softener installation.
Notes
1. It is most important that the correct concentration of the
water treatment products is maintained in accordance
with the manufacturers’ instructions.
2. If the boiler is installed in an existing system any
unsuitable additives MUST be removed by thorough
cleansing. BS7593:2019 details the steps necessary to
clean a domestic heating system.
3. In hard water areas, treatment to prevent lime scale may
be necessary - however the use of articially softened
water is NOT permitted.
4. Under no circumstances should the boiler be red before
the system has been thoroughly ushed.
For further information contact:
Fernox
www.fernox.com
Tel: [phone]
Sentinel Performance Solutions
www.sentinelprotects.com
Tel: [phone]
Scalemaster Water Treatment Products
www.scalemaster.co.uk
Tel: [phone]
Calmag Ltd.
www.calmag Ltd.com
Tel: [phone]
Adey
www.adey.com
Tel: [phone]

14
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.1 BOILER ASSEMBLY - EXPLODED VIEW
Note that item numbers are linked to the spares list
104 CH Return Valve
105 CH Flow Valve
108 Pump Head
110 Auto Air Vent
113 Pressure Relief Valve
114 Pipe - PRV Outlet
115 Pipe - Flow
116 Pipe - Return
117 Pipe - Expansion Vessel
118 Expansion Vessel
119 Return Group Manifold
120 Flow Group Manifold
131 Water Pressure Switch
135 Pressure Gauge
203 Gas Cock
205 Gas Valve
206 Pipe - Gas Injector
211 Injector Assy
214 Venturi
215 Fan
217 Burner
218 Gasket - Burner
219 Sump Clean Out Cover
223 Flue Manifold
224 Flue Manifold Top
227 Clamp Retaining Flue Turret
228 Hose Condensate Internal
229 Condensate Trap
231 Condensate Outlet Connection
239 Condensate Drain Tube
302 PCB
306 Ignition/Detection Electrode
308 Ignitor Unit
309 Thermistor
313 Ignition Lead
324 Control Box Lid
325 Control Box Front
326 Blank Insert
401 Heat Engine
503 Wall Mounting Bracket
504 Front Panel
505 Fascia
506 Bracket - Spark Generator
507 Bracket - Expansion Vessel
504
505
215
227
224
223
214
217
118
507
313
229
326 325 302
324
135
108 117
119
114
219
113
218
401
506
306
308
211
205
116
203
105
104
115
309
228
206
231
131
239
309
110
120
1
0
2
3
4
bar
503

15
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.2 UNPACKING
The boiler is supplied fully assembled in Pack A.
A telescopic or non-telescopic ue assembly for
rear or side ue outlet in Pack B is suppled as a
separate order.
Pack A Contents
1. Boiler
2. Hardware Pack Box
3. Wall Mounting Plate
4. These Installation/Users Instructions
5. Wall Mounting Template
6. Boiler Warranty
7. PRV Drain Pipe
Unpack and check the contents
Hardware Pack
Box Contents
9. 1x HP Box - 180 x 111 x 57.5 mm
10. 2x Pipe CH Flow/Return
11. 1x Gas Cock
12. 2x Valve CH G3/4x 22 mm
13. 1x Pipe Gas Inlet
Accessory Bag Contents
14. 3x Washers*
15. 2x Wall Plugs
16. 2x Screws
17. 1x Flue Clamp Screw
18. 1x PRV Clip
16 1715
12
3
46
5
*Refer to Valve Washer Template inside box lid.
11
12
13
10
9
14
7
10
Refer to Section
2.17
IMPORTANT This clip needs to be tted
to ensure correct operation of the boiler.
18

16
Installation and Servicing
Section 2 - Installation
INSTALLATION
IMPORTANT: Ensure the wall where the boiler will be is
at.
The wall mounting template is located on the internal
protective packaging. The template shows the position
of the xing and rear ue centre holes for a standard
installation.
1. Secure the template into the required position. Ensure it
is square by hanging a plumbline.
2. If tting a side ue, extend the ue centreline onto the
side by 155 mm on a standard wall x or 200 mm if
using a stand-o󰀨 bracket.
3. Mark the following on to the wall:
a The selected group of wall mounting screw holes.
b. The centre position of the ue duct. Marking both the
centre and the circumference of the ue duct.
4. Remove the template plate from the wall.
2.3 WALL MOUNTING TEMPLATE
2.4 PREPARING THE WALL
1. Check all of the hole positions before drilling.
2. Cut the ue hole with a 127 mm core boring tool, ensure
the hole is square to the wall.
3. Drill the 2 mounting holes with a 7.5 mm / 8 mm masonry
drill and insert the plastic plugs provided.
4. Locate 2 No.14 x 50 mm screws in the wall mounting plate
(one at each side, in any of the 3 holes provided at each
side) and screw home. Ensure mounting bracket is level.
2.5 FITTING THE WALL MOUNTING PLATE 2.6 MOUNTING THE BOILER
Screw the wall mounting plate to the wall using 2 wall plugs
tted previously with the 2 screws provided.
Choose one of the 2 sets of slots in left and right bank.
Ensure that at least one of the screws is tted into a top slot
and the mounting bracket is level.
“A”
Extended centre line
155
(200)
X
Section
through wall
Side flue only
127 mm diameter hole
Rear flue only
127 mm diameter hole
esp9496
Example of fixing
Refer to Section
2.7
1. Lift the boiler onto the wall mounting plate and locate it
over the 2 tabs.
WARNING: Ensure that, during the cutting
operation, masonry falling outside of the building does
not cause damage or personal injury.

17
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.7 FLUES AND LOCATIONS
This installation & servicing manual must be read in conjunction with ue kit and tting guide.
Flue deflector
Ideal part no.
208176
Flue extension
0.5 m, 1 m or 2 m
Weather collar
flat roof
Ideal part no.
152259
Ideal part no.
203130
Flue elbow 90°
Ideal part no.
203131
Flue elbow 45°
Horizontal flue
0.6 or 0.8 m
Ideal part no.
0.5 m 208169
0.7 m 208174
Telescopic
horizontal flue
0.5 or 0.7 m
Ideal part no.
211039
Vertical flue
terminal and
connector
Weather collar
Ideal part no.
152258
Ideal part no.
0.5 m 211037
1 m 203129
2 m 211038
Balcony flue kit
Ideal part no. 208177
Soffit kit
Ideal part no. 211302
Raised horizontal flue kit
Ideal part no. 208290
pitched roof
0.6 m 208171
0.8 m 217442
Ideal part no.
WARNING:
• It is critical that products of combustion cannot re-enter
the building
• The ue terminal must always have a free passage of
air.
CAUTION:
• White sections of the ue must not be visible outside.
• Install a ue terminal guard where the ue terminal is less
than 2 metres above a platform where persons can walk
or come into contact with the terminal.
• Water is the only permitted lubricant for ue assembly.
Rubber
Terminal
Wall Seal
Terminal
MUST be
fitted as
shown

18
Installation and Servicing
Section 2 - Installation
INSTALLATION
1 m
2 m
3 m
4 m
26 mm
52 mm
78 mm
104 mm
L
B
2.8 FLUES AND LOCATIONS - CONTINUED
B = Top Clearance
Top Clearance is measure from the top of the turret to the top
of the hole where the ue terminates.
L = E󰀨ective ue length.
The e󰀨ective length of the ue is measured from the edge of
the turret to the ue terminal lip.
Flue systems that require extension kits must be installed
with a 1.5° decline from the ue terminal back to the boiler.
A 1.5° decline can be achieved by designing the ue with a
26 mm rise per meter length of ue.
Flue Terminal Positions Min. Spacing*
1. Directly below, above or alongside an opening. 300 mm
2. Below guttering, drain pipes or soil pipes. 75 mm
25 mm*
3. Below eaves. 200 mm
25 mm*
4. Below balconies or a car port roof. 200 mm
25 mm*
5. From vertical drain pipes or soil pipes. 150 mm
25 mm*
6. From an internal or external corner or a 300 mm
boundary alongside the terminal. 25 mm*
7. Above adjacent ground, roof or balcony level. 300 mm
8. From a surface or a boundary facing the terminal. 600 mm
9. From a terminal facing a terminal. 1200 mm
10. From an opening in a car port into dwelling. 1200 mm
11. Vertically from a terminal on the same wall. 1500 mm
12. Horizontally from a terminal wall. 300 mm
13. Horizontally from an adjacent window 600 mm
14. Facing an opening into an adjacent building 2000 mm
15. At an angle to the boundary 90° 300 mm
45° 600 mm
16. Parallel to a boundary 300 mm
17. Below ground level – open light well
a) Below ground <1,000 mm
b) Above oor level 300 mm
c) From side 300 mm
d) From facing surface 600 mm
*Only one reduction down to 25mm is allowed per installation.
Table 5 - Flue Terminal Position
Horizontal Maximum E󰀨ective Flue Length
15-24 Kw 9.0 metres
30 kW 8.0 metres
Vertical
15-24/30 kW 7.5 metres
Elbows increase resistance and have an e󰀨ective ue length
equivalence. The following table is an example.
Part x Resistance
45oelbow 2 1.2 metres
90oelbow 2 2.0 metres
E󰀨ective ue length 3.2 metres
IMPORTANT INFORMATION
Install the ue in accordance to BS 5440:1 2008
Position the terminal, so the products of combustion do not
cause a nuisance.
The terminal outlet duct must not be closer than 25 mm to
combustible material.
The ue is secured in the wall using either sand and cement
or heatproof silicone.
The ue must be supported by a bracket every metre of ue
length and at every change of direction. Concealed ues
must have inspection hatches no more than 1.5 metres from
joints.
Where possible inspection hatches should be located at
change of directions. Where this is not possible then bends
must be viewable from both sides.
Inspection hatches must be at least 300 mm
2
.

19
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.9 HORIZONTAL FLUE POSITIONS
2.10 VERTICAL FLUE POSITIONS
16
17
6
7
8
9
10 11
12
13
14
15
1
2
3
4
5
1
1
6
6
7
Boundary
Boundary
600
300
300 c.
300 b.
600 d.
300
a. < 1000
3
2
1
600
345
1
2
2000
Opening in adjacent
building
14
3
1
2
300
At an angle to the
boundary
15
2
Parallel to the
boundary
16
Facing the
boundary
8
600
1
300
3
All measurements : mm
Boundary
Boundary
600
Height Difference ‘A’
Less than 300 B= 300
Greater than 300 B = 1500
300
625
fixed
2000
600
2000
690
Fixed
Separation
Distance
‘B’
Height
Difference
‘A’
300
600 600
2000
All measurements : mm
Refer to Table 5
Refer to Table 5

20
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.11 FLUE SYSTEM DIMENSIONS 2.12 FITTING THE TURRET
Flue Design
IMPORTANT:
1. Flue lengths may vary, always measure ue lengths
before cutting.
2. E󰀨ective ue length and actual ue length are di󰀨erent
measurements.
3. E󰀨ective ue length is made up of the ue length
equivalence and the ue sections between the turret,
elbows and terminal.
4. Actual ue length is the amount of ue needed to achieve
the e󰀨ective ue length, this includes insertions.
Part Actual
Length
Insertion E󰀨ective
Length
1 m ue length 1 m 30 mm 970 mm
1 m ue length 1 m 30 mm 970 mm
0.6 m ue terminal 0.6 m 30 mm 570 mm
Total 2.6 m 90 mm 2510 mm
Retaining
screw
Clamp Lugs
Sample points
Flue Outlet
C
A
A - Duct Assembly
B - Flue Turret
C - Turret Clamp
D - Seal
Flue Outlet
D
B
1. Ensure the condensate trap in lled with water
2. Ensure the rubber seal is not damaged and tted
correctly on the appliance manifold.
3. Firmly hold the ue and push the turret on until it has
travelled 30 mm ensuring the ue has not rotated or
moved forward.
4. Push the turret into the manifold ensuring the upper
plastic lip is ush with the top of the manifold.
5. Fully engage the clamp location section into the manifold
location hole and rotate down onto the ange.
6. Use the securing screws to secure the clamp to the
appliance.
7. Ensure all sample points are accessible and all sample
plugs and caps are tted.
30
30
Elbow insertion (mm)Turret insertion (mm)
100mm
Edge of turret
to outside face of wall plus
44mm = ue length
A
WALL