Ideal Heating LOGIC HEAT2 H12 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.
INSTALLATION
& SERVICING
October 2022
UIN 228298 A04
LOGIC HEAT2
H12 H15 H18 H24 H30

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.
MODEL
SYMBOL UNITS 12 kW 15 kW 18 kW 24 kW 30 kW
Condensing Boiler n/a n/a yes yes yes yes yes
Low Temperature Boiler n/a n/a no no no no no
B1 Boiler n/a n/a no no no no no
Cogeneration Space Heater n/a n/a no no no no no
Equipped with a Supplementary Heater n/a n/a no no no no no
Combination Heater n/a n/a no no no no no
Nominal Heat Output for Space Heating
Full Load P4 kW 12.1 15.1 18.1 24.3 30.3
Part Load P1 kW 3.9 4.9 5.8 7.8 9.8
Auxiliary Electricity Consumption
Full Load elmax kW 0.016 0.022 0.025 0.046 0.050
Part Load elmin kW 0.011 0.017 0.004 0.013 0.012
Standby PSB kW 0.002 0.003 0.002 0.002 0.002
Seasonal Space Heating Energy
E󰀩ciency
Full Load ƞ4 % 90.0 90.0 89.8 90.0 89.6
Part Load ƞ1 % 97.9 97.8 98.5 98.6 98.2
Standby Loss Pstby kW 0.05 0.05 0.05 0.05 0.05
Ignition Pign kW 0 0 0 0 0
Emissions NOx (Gross) NOx, pond Hs mg/kWh 10 21 24 28 24
Annual Energy Consumption QHE GJ 38 47 55 75 93
Sound Power Level, Indoors LWA dB 36 42 44 50 50

3Installation and Servicing
LOGIC HEAT2H 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
12 kW 15 kW 18 kW 24 kW 30 kW
Condensing boiler Yes
Seasonal space heating e󰀩ciency class A
Rated heat output kW 12 15 18 24 30
Seasonal space heating energy e󰀩ciency ƞs % 93 93 93 94 93
Annual energy consumption QHE GJ 38 47 55 75 93
Sound power level, indoors LWA dB 36 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 - Standard Assessment Procedure
IEE - Institution of Electrical Engineers
UKCA - UK Conformity Assessed
IoT - Internet of Things
RHS - Right Hand Side
LHS - Left Hand Side
PCB - Printed Circuit Board

5Installation 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 ...............................................................................9
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 Open Vent System Requirements ........................................12
1.16 Schematic Pipework and System Balancing ........................12
1.17 Low Head and Large Systems with Extensive Pipe Runs - .....
Open Vent.............................................................................13
1.18 Sealed System Requirements ..............................................13
1.19 Sealed System Requirements - Cont. ..................................14
1.20 System Balancing.................................................................15
1.21 Water Treatment...................................................................15
Section 2 - Installation ........................................................................16
2.1 Boiler Assembly - Exploded View .........................................16
2.2 Unpacking.............................................................................17
2.3 Wall Mounting Template........................................................18
2.4 Preparing the Wall ................................................................18
2.5 Fitting the Wall Mounting Plate .............................................18
2.6 Mounting the Boiler ..............................................................18
2.7 Flues and Locations..............................................................19
2.8 Flues and Locations - Cont...................................................20
2.9 Horizontal Flue Positions .....................................................21
2.10 Vertical Flue Positions .........................................................21
2.11 Flue System Dimensions .....................................................22
2.12 Fitting the Turret....................................................................22
2.13 Cutting the Flue ....................................................................23
2.14 Assembling the Vertical Flue ................................................24
2.15 Rear Flue Outlet Kit (55/80) Assembly - ...................................
Exploded View......................................................................25
2.16 Terminal Wall Seal Assembly / Positioning...........................25
2.17 Setting the rear ue length - ....................................................
Wall Thickness of 115 mm to 442 mm .................................25
2.18 Fitting the Wall Plate / Rear Flue Terminal Assembly ...........26
2.19 Mounting the Boiler - Rear Flue Outlet Kit (55/80)................26
2.20 Condensate Drain.................................................................27
2.21 Condensate Drain - Cont’d ...................................................28
2.22 Connections..........................................................................29
2.23 Electrical Connections ..........................................................29
2.24 Installer Wiring......................................................................29
2.25 Installer Wiring - Continued ..................................................30
2.26 Installer Wiring - Cont ...........................................................31
2.27 Pump Overrun - Install..........................................................31
2.28 Wiring Diagram.....................................................................32
2.29 Commissioning and Testing..................................................33
2.30 Initial Lighting........................................................................34
2.31 The Display...........................................................................35
2.32 General Checks....................................................................35
2.33 General Checks Cont. - Water Circulation............................36
2.34 Restart Procedure.................................................................36
2.35 Accessing the Installer Mode................................................37
2.36 Handing Over........................................................................37
Section 3 - Servicing...........................................................................38
3.1 Servicing Schedule...............................................................38
3.2 Removal / Replacement of Components..............................39
3.3 Draining the Boiler ................................................................39
3.4 Boiler Front Panel Removal / Replacement..........................40
3.5 Flue Manifold Removal/Replacement...................................40
3.6 Fan and Venturi Assembly Removal and Cleaning...............41
3.7 Burner Removal and Cleaning..............................................42
3.8 Cleaning the Heat Exchanger...............................................42
3.9 Ignition / Detection Electrode Replacement / Inspection ......43
3.10 Cleaning the Condensate Trap.............................................43
3.11 Flow & Return Thermistor Replacement...............................44
3.12 Burner Injector Replacement................................................44
3.13 Burner Replacement.............................................................44
3.14 Spark Generator Replacement.............................................45
3.15 Gas Control Valve Replacement...........................................45
3.16 Condensate Trap Replacement / Cleaning...........................46
3.17 Flow Switch Replacement ....................................................46
3.18 Primary PCB Replacement...................................................46
3.19 Heat Engine Replacement....................................................47
Section 4 - Fault Finding.....................................................................48
4.1 Fault Finding Main Menu ......................................................48
4.2 ‘L 01’ - Overheat Lockout......................................................49
4.3 ‘L 02’ - IGNITION Lockout.....................................................49
4.4 ‘L 06’ - Flame On Before Gas Valve On................................50
4.5 ‘F 02 or FN or LN’ - Flame Loss............................................50
4.6 ‘F 03’ - Fan Fault...................................................................51
4.8 Flow/Return Reversed..........................................................51
4.7 F 04 or L 04’ - Flow Thermistor Fault ...................................51
4.9 ‘F 05 or L 05’ - Return Thermistor Fault ...............................52
4.10 ‘F 06’ - Outside Sensor Fault ................................................52
4.11 No CH Operation ..................................................................53
4.12 No Display ............................................................................54
4.13 No DHW Operation...............................................................54
4.14 Flow/Return Differential Greater than 50°C..........................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
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.
* 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 have been certied by a notied body.
12 kW 15 kW 18 kW 24 kW 30 kW
Gas Supply 2H - G20 - 20 mbar
Gas Supply Connection 15 mm copper compression
Injector Size mm 4.15 4.15 4.15 4.15 4.65
Flow Connection Central Heating 22 mm copper compression
Return Connection Central Heating 22 mm copper compression
Flue Terminal Diameter mm 100
Average Flue Temp-Mass Flow Rate 56ºC - 5g/s 56ºC - 6g/s 58ºC - 8g/s 63ºC - 10g/s 69ºC - 13g/s
CO2Content (± 0.7) Max. CH 9.1% 9.4% 9.3% 9.3% 9.7%
Min. CH 8.5% 8.8% 8.7% 8.4% 8.8%
Maximum Working Pressure
(Sealed Systems) bar (psi) 2.5 (36.3)
Electrical Supply 230 V ~ 50 Hz
Power Consumption W 16 22 25 46 50
Fuse Rating External : 3 A Internal : T4A HRC L250 V
Water Content Central Heating litre
(gal) 1.2 (0.26)
Packaged Weight kg 25.1
Lift Weight kg 21.9
Boiler Casing Size Height mm 700
Width mm 395
Depth mm 278
Boiler Input: 12 kW 15 kW 18 kW 24 kW 30 kW
Min Max Min Max Min Max Min Max Min Max
Boiler Input ‘Q’ Net CV kW 4.9 12.1 4.9 15.1 4.9 18.1 4.9 24.3 6.1 30.4
Gross CV kW 5.4 13.4 5.4 16.6 5.4 20.1 5.4 27.0 6.7 33.7
Gas Consumption m3/h 0.500 1.246 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 12.0 4.8 15.0 4.8 18.0 4.8 24.2 6.1 30.3
Condensing
40ºC Mean Water Temp. kW 5.1 13.0 5.1 15.9 5.1 19.1 5.1 25.6 6.4 31.0
Seasonal E󰀩ciency* SEDBUK 2005 91.1% 91.2% 91.1% 91.2% 91.1%
Seasonal E󰀩ciency* SEDBUK 2009/2012 89.4% 89.4% 89.7% 89.7% 89.6%
NOx Classication Class 6
Table 1 General Data

7Installation 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 ................. 31
Time and temperature control to hot water ............. 31
TRVs ........................................................................ 10
Auto bypass ............................................................. 10
Boiler interlock.......................................................... 10
For all boilers
Flushing to BS.7593................................................. 15
Inhibitor .................................................................... 15
Central heating mode
Heat input...................................................to be calculated
Burner operating pressure ............................................. n/a
For assistance call Technical
Helpline 01482 498663
Page
Central heating ow temp. ...........measure and record
Central heating return temp. ........measure and record
For combination boilers only
Scale reducer .......................................................... n/a
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................................................27-28
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 HEAT2 H
BOILER SIZE
KW
G.C. Applicance No
(Benchmark No.)
12 41-860-10
15 41-860-11
18 41-860-12
24 41-860-13
30 41-860-14

8
Installation and Servicing
Section 1 - General
1.1 INTRODUCTION
The Logic Heat2H range of boilers are wall mounted, full
sequence, automatic spark ignition, low water content, fanned
ue, high e󰀩ciency, condensing, heating only gas boilers.
Due to the high e󰀩ciency of the boiler a plume of water vapour
will form at the terminal during operation.
A variable temperature control is tted on the user control.
The boiler includes as standard:
- Boiler frost protection
Notes. The appliance must be wired with a permanent live
supply, or the boiler frost protection will not operate.
The boiler warranty will be invalid if these requirements are not
complied with.
The boiler casing is of white painted mild steel with a polymer
front panel.
The boiler temperature control is visibly located in the control
panel on the front of the boiler.
The heat exchanger is manufactured from cast aluminium.
Note that these boilers cannot be used on systems which
include gravity circulation.
The boiler is suitable for connection to fully pumped open
vented or sealed water systems. 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 upwards.
A rear ue outlet kit (55/80) is available which provides a
compact installation.
Data Plate
The boiler model and serial number can be located on the
bottom of the boiler casing, shown in Section 1.16 - Water &
Gas Connection Diagram.
1.2 OPERATION
When there is a demand, the heating 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 Accessories &
Controls Installation Guide 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 GB and should
be installed in accordance with the rules in force.
In GB, 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.
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 BSEN
55014-2 for use with Natural Gas & Propane.

9Installation and Servicing
Section 1 - General
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.
IMPORTANT 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
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.
Refer to Section
1.14
1.8 AIR SUPPLY
It is not necessary to have an air vent in the room or internal
space where the boiler is installed.
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
CAUTION: This appliance is IP20 rated, do not clean
with jets of water.

10
Installation and Servicing
Section 1 - General
1.10 WATER CIRCULATION SYSTEM
IMPORTANT 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,
BS EN 12831 and BS EN 14336.
Water treatment is covered later in these instructions.
Refer to Section
1.21
1.11 BOILER CONTROLS
Install controls to ensure that the boiler has no demand when
there is no requirement from the system.
Heating systems with TRVs in individual rooms must include a
thermostat to control the temperature in rooms without TRVs.
At least 10% of the minimum boiler heat output should be
achieved using a room thermostat. A bypass circuit with an
automatic bypass valve must be tted to systems with TRVs or
two-port valves on all the radiators to ensure water ow.
1.12 ELECTRICAL SUPPLY
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: All 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
2.20
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
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.
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
IMPORTANT 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.
WARNING: This appliance must be earthed

11Installation and Servicing
Section 1 - General
Underside View
Condensate Connection and Gas Connection
Gas Condensate Drain
Gas Inlet
DATA PLATE
29
Condensate Drain
133 141 122
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.
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.
395
Refer to Section
2.22
278
700
100*
Flue
terminal
2.52.5
from case
98
200
152
IMPORTANT Please ensure there is su󰀩cient clearance either side and below the boiler, particularly from door hinges
and the base of a cupboard.
48
308
* 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.
Measurements in mm

12
Installation and Servicing
Section 1 - General
1.15 OPEN VENT SYSTEM REQUIREMENTS
1.16 SCHEMATIC PIPEWORK AND SYSTEM BALANCING
The boiler does not normally need a bypass but at least
some radiators on the heating circuit, of load 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 for both CH and HW. Turn
the cylinder thermostat down. 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 these lockshield valves to give boiler ow and
return temperatures not more than 20oC apart. These
valves should now be left as set.
2. Open all manual or thermostatic radiator valves and
adjust the lockshield valves on remaining radiators to
give around 20oC temperature drop at each radiator.
3. Turn up the cylinder thermostat and adjust the cylinder
balancing valve so that the cylinder achieves a maximum
ow consistent with adequate ow to the radiators.
Check that with only the domestic hot water loop in circuit
a di󰀨erential temperature of 25oC across the boiler is not
exceeded.
4. Adjust room and cylinder thermostats and programmer to
NORMAL settings.
System
Return
Auto
Air
Vent
The system should be vented directly o󰀨 the boiler ow pipe,
as close to the boiler as possible. The cold feed entry should
be inverted and MUST be positioned between the pump and
the vent, and not more than 150 mm away from the vent
connection.
Note. Combined feed and vent pipes may also be tted.
There should be a minimum height 450 mm of open vent
above the cistern water level. The vertical distance between
the highest point of the system and the feed/expansion
cistern water level MUST not be less than 450 mm.
The pump must be tted on the ow side of the boiler.
A suitable pump is a domestic circulator capable of providing
a maximum 20oC temperature di󰀨erential across the boiler
with the whole of the heating circuit open (e.g. Grundfos
UPS 15/50, 15/60 or equivalent). With the minimum ow
circuit allowed by the controls the di󰀨erential must not
exceed 25 oC.
The vertical distance between the pump and feed/expansion
cistern MUST comply with the pump manufacturer’s
minimum requirements, to avoid cavitation. Should these
conditions not apply either lower the pump position or raise
the cistern above the minimum requirement specied by
Ideal Heating. The isolation valves should be tted as close
to the pump as possible.
It is recommended that an automatic air vent should be tted
to the return connection.
Refer to Section
1.18
Refer to Section
1.14 & 2.11

13Installation and Servicing
Section 1 - General
1.17 LOW HEAD AND LARGE SYSTEMS WITH EXTENSIVE PIPE RUNS - OPEN VENT
Note. The pump manufacturers’ minimum requirements
must be complied with.
All dimensions in mm
205862-10060
Auto
Air
Vent
This arrangement is useful for large systems where
radiators at the extremities are di󰀩cult to vent. This can
lead to pumping over with conventional feed and vent
arrangements.
The following conditions MUST be observed:
1. The top of the automatic air vent must be below the cold
water level.
2. The static water level (cold) must be at least 200mm
above the top of the horizontal ow pipe, tted as shown.
The vent connection MUST NOT be made immediately
o󰀨 the top of the boiler as venting is made less e󰀩cient.
3. The maximum practical length of 22mm cold feed pipe
should be used in order to reduce the e󰀨ective volume
of hot system water expanding into the feed/expansion
cistern to a minimum.
1.18 SEALED SYSTEM REQUIREMENTS
Non-return
valve
Automatic
air vent
Hose unions
Additional
stop valve
Hose connector
Hosepipe
(disconnect
after filling)
Double check valve
assembly
(note direction of flow)
Temporary hose
(disconnect
after filling)
A
uto
Air
Vent
Note. A drain cock is
provided within the boiler
PRV
2. PRV
A pressure relief valve (PRV) complying with the relevant
requirements of BS.6759 must be tted in the ow pipe
as close to the boiler as possible and with no intervening
valve or restriction. The valve should have the following
features:
a. A non-adjustable preset lift pressure not exceeding
3bar.
b. A manual testing device.
c. Provision for connection of a discharge pipe.
The valve or discharge pipe should be positioned
so that the discharge of water or steam cannot
create a hazard to the occupants of the premises or
cause damage to electrical components and wiring.
Notes.
a. The method of lling, relling, topping up or ushing
sealed primary hot water circuit from the mains via a
temporary hose connection is only allowed
if acceptable to the local
water authority.
b. When installing the lling
device, it must be connected
as shown to fully comply
with the water regulations.
This may involve the tting of
an additional WRAS approval
isolator valve to the mains
supply.
1. General
a. The installation must comply with the requirements
of BS. 6798, BS. EN 12831 and BS. EN 14336.
b. The installation should be designed to work with ow
temperatures of up to 80 oC.
c. All components of the system, including the heat
exchanger of the indirect cylinder, must be suitable
for a working pressure of 3 bar and a maximum
temperature of 110oC. Care should be taken in
making all connections so that the risk of leakage is
minimised.

14
Installation and Servicing
Section 1 - General
3. Pressure Gauge
A pressure gauge covering at least the range 0-4 bar
must be tted to the system. The gauge should be
easily seen from the lling point and should preferably be
connected at the same point as the expansion vessel.
4. Expansion Vessel
a. A diaphragm type expansion vessel must be
connected to a point close to the inlet side of the
pump, the connecting pipe being not less than 15 mm
size and not incorporating valves of any sort.
b. The vessel capacity must be adequate to accept the
expansion of the system water when heated to 110oC.
c. The charge pressure must not be less than the static
water head above the vessel. The pressure attained
in the system when heated to 110oC should be at
least 0.35 bar less than the lift pressure of the safety
valve.
For guidance on vessel sizing refer to the table in
this section.
For further details refer to BS. 5449, BS. 7074:1 and
the British Gas Corporation publication ‘Material
and Installation Specications for Domestic Central
Heating and Hot Water’. For IE refer to the current
edition of I.S.813.
5. Cylinder
The cylinder must be either of the indirect coil type or a
direct cylinder tted with an immersion calorier which is
suitable for operating on a gauge pressure of 0.35 bar
in excess of the PRV setting. Single feed indirect
cylinders are not suitable for sealed systems.
6. Make-up Water
Provision must be made for replacing water loss from the
system, either:
a. From a manually lled make-up vessel with a readily
visible water level. The vessel should be mounted at
least 150 mm above the highest point of the system,
and be connected through a non-return valve to the
system, tted at least 300 mm below the make-up
vessel on the return side of the domestic hot water
cylinder or radiators.
or
b. Where access to a make-up vessel would be di󰀩cult
by pre-pressurisation of the system. Refer to ‘Filling’.
7. Mains Connection
There must be no direct connection to the mains water
supply or to the water storage tank supplying domestic
water, even through a non-return valve, without the
approval of the local water authority.
1.19 SEALED SYSTEM REQUIREMENTS - CONT.
8. Filling
The system may be lled by one of the following
methods:
a. Through a cistern, used for no other purposes, via a
ball valve permanently connected directly to a service
pipe and/or a cold water distributing pipe.
The static head available from the cistern should be
adequate to provide the desired initial system design
pressure.
The cold feed pipe from the cistern should include a
non-return valve and a stop valve with an automatic
air vent connected between them, the stop valve
being located between the system and the automatic
air vent. The stop valve may remain open during
normal operation of the system if automatic water
make-up is required.
b. Through a self-contained unit comprising a cistern,
pressure booster pump (if required) and, if necessary,
an automatic pressure reducing valve and ow
restrictor. The cistern should be supplied through a
temporary connection from a service pipe or cold
water distributing pipe.
This unit may remain permanently connected to
the heating system to provide limited automatic
water make-up. Where the temporary connection is
supplied from a service pipe or distributing pipe which
also supplies other draw-o󰀨 points at a lower level
then a double check valve shall be installed upstream
of the draw-o󰀨 point.
c. Through a temporary hose connection from a draw-
o󰀨 tap supplied from a service pipe under mains
pressure. Where the mains pressure is excessive a
pressure reducing valve shall be used to facilitate
lling.
The following ttings shall form a permanent part of
the system and shall be tted in the order stated:
A stop valve complying with the requirements of
BS. 1010, Part 2 (the hose from the draw-o󰀨 tap shall
be connected to this tting).
A test cock.
A double check valve of an approved type.
• Thoroughly ush out the whole of the system with
cold water, without the pump in position.
• With the pump tted, ll and vent the system until
the pressure gauge registers 1.5 bar. Examine for
leaks.
• Check the operation of the PRV by manually
raising the water pressure until the valve lifts.
This should occur within ± 0.3 bar of the preset lift
pressure.
• Release water from the system until the initial
system design pressure is reached.
• Light the boiler and heat the system to the
maximum working temperature. Examine for leaks.
• Turn o󰀨 the boiler and drain the system while still
hot.
• Rell and vent the system.
• Adjust the initial pressure to the required value.

15Installation and Servicing
Section 1 - General
Sizing procedure for expansion vessels: The volume of the expansion vessel (litres) tted to a sealed system shall not be
less than that given by the table on the following page, multiplied by a factor of 0.8 (for ow temperatures of less than 83o C).
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.
3. Adjust the room thermostat and programmer to
NORMAL settings.
1.20 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 in 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]
PRV setting 3.0 bar 2.5 bar 2.0 bar
Vessel charge and initial 0.5 1.0 1.5 0.5 1.0 1.5 0.5 1.0
system pressure bar bar bar bar bar bar bar bar
Total water content of system Expansion vessel volume litres
litres
25 2.1 2.7 3.9 2.3 3.3 5.9 2.8 5.0
50 4.2 5.4 7.8 4.7 6.7 11.8 5.6 10.0
75 6.3 8.2 11.7 7.0 10.0 17.7 8.4 15.0
100 8.3 10.9 15.6 9.4 13.4 23.7 11.3 20.0
125 10.4 13.6 19.5 11.7 16.7 29.6 14.1 25.0
150 12.5 16.3 23.4 14.1 20.1 35.5 16.9 30.0
175 14.6 19.1 27.3 16.4 23.4 41.4 19.7 35.0
200 16.7 21.8 31.2 18.8 26.8 47.4 22.6 40.0
225 18.7 24.5 35.1 21.1 30.1 53.3 25.4 45.0
250 20.8 27.2 39.0 23.5 33.5 59.2 28.2 50.0
275 22.9 30.0 42.9 25.8 36.8 65.1 31.0 55.0
300 25.0 32.7 46.8 28.2 40.2 71.1 33.9 60.0
Multiplying factors for
other system volumes 0.0833 0.109 0.156 0.094 0.134 0.237 0.113 0.20
1.21 WATER TREATMENT

16
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.1 BOILER ASSEMBLY - EXPLODED VIEW
Note that item numbers are linked to the spares list
106 PIPE - RETURN
107 FLOW MANIFOLD/ASSEMBLY
203 GAS COCK
205 GAS VALVE
206 PIPE - GAS INJECTOR
211 INJECTOR ASSEMBLY
214 VENTURI
215 FAN
217 BURNER
218 GASKET - BURNER
219 SUMP CLEAN OUT COVER
223 FLUE MANIFOLD
224 FLUE MANIFOLD TOP
225 FLUE MANIFOLD - TOP SEALING CAP
226 FLUE MANIFOLD - REAR SEALING CAP
227 CLAMP RETAINING FLUE TURRET
228 HOSE CONDENSATE INTERNAL
229 SIPHON TRAP
231 CONDENSATE OUTLET CONNECTION
233 FLUE SENSING NIPPLE
301 CONTROLS BOX HINGES & HARNESS
CLIPS
302 PCB
304 CONTROL THERMISTOR
(FLOW / RETURN)
305 POTENTIOMETER & BLANK KNOBS
306 ELECTRODE IGNITION
308 IGNITOR UNIT
309 FLOW THERMISTOR
313 IGNITION DETECTION LEAD
324 CONTROLS BOX LID
325 CONTROL BOX FRONT
401 HEAT ENGINE
404 ELBOW RETURN CONNECTOR
503
WALL MOUNTING & FLOW SUPPORT
BRACKET
504 FRONT PANEL
505 FASCIA
506 BRACKET - GAS VALVE
505
106
224
227
205
504
217
219
223
228
305
313
308 401
506
218
229
302
324
325
203
226
225
215
214
211
503
107
301
326
304
233
206
404
306
304
231
305
103

17Installation and Servicing
Section 2 - Installation
INSTALLATION
2.2 UNPACKING
Unpack and check the contentsThe 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
Hardware Pack
Box Contents
7. 1x HP Box - 180 x 111 x 57.5 mm
8. 1x Gas Cock
Accessory Bag Contents
9. 1x Washers*
10. 2x Wall Plugs
11. 2x Screws
11 910
1
2
3
4
6
5
*Refer to valve/washer template
inside hardware pack box lid.
7
8

18
Installation and Servicing
Section 2 - Installation
INSTALLATION
2.3 WALL MOUNTING TEMPLATE
2.4 PREPARING THE WALL
“A”
Extended centre line
155
(200)
X
Section
through wall
Side flue only
127 mm diameter hole
Rear flue only
127 mm diameter hole
Refer to Section
2.8
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
Care MUST be taken to ensure the correct holes are drilled.
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.
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
1. Lift the boiler onto the wall mounting plate and locate it
over the 2 tabs.
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.
205862-10084
Example of fixing
WARNING: Ensure that, during the cutting
operation, masonry falling outside of the building does
not cause damage or personal injury.

19Installation and Servicing
FLUE OUTLET
Section 2 - 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
Ideal part no.
205990
Rear outlet flue
(55/80)

20
Installation and Servicing
FLUE OUTLET
Section 2 - Installation
1 m
2 m
3 m
4 m
26 mm
52 mm
78 mm
104 mm
L
B
2.8 FLUES AND LOCATIONS - CONT
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 3 - Flue Terminal Position
Horizontal Maximum E󰀨ective Flue Length
12-24 kW 9.0 metres
30 kW 8.0 metres
Vertical
12-24/30 kW 7.5 metres
Elbows increase resistance and have an e󰀨ective ue length
equivalence. The following table is an example.
Part Resistance
45oelbow 0.6 metres
90oelbow 1.0 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
.