IDEAL LOGIC+ Combi 24 User manual

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.
For the very latest copy of literature for specification and maintenance practices visit our
website www.idealboilers.com where you can download the relevant information in PDF format.
April 2015
UIN 212138 A01
LOGIC+ COMBI
24 30 35
INSTALLATION
AND SERVICING

2
Ideal Logic +Combi - Installation and Servicing
MODEL
SYMBOL UNITS 24 30 35
Condensing Boiler n/a n/a yes yes yes
Low Temperature Boiler n/a n/a no no no
B1 Boiler n/a n/a no no no
Cogeneration Space Heater n/a n/a no no no
Equipped with a Supplementary Heater n/a n/a no no no
Combination Heater n/a n/a yes yes yes
Nominal Heat Output for Space Heating
Full Load P4kW 24.2 24.2 24.2
Part Load P1kW 7.9 7.9 7.9
Auxiliary Electricity Consumption
Full Load elmax kW 0.29 0.32 0.42
Part Load elmin kW 0.12 0.13 0.13
Standby PSB kW 0.004 0.004 0.004

Full Load ƞ4% 89.6 89.6 89.6
Part Load ƞ1% 98 98 98
Standby Loss Pstby kW 0.05 0.05 0.05
Ignition Pign kW 0 0 0
Emissions NOxmg/kWh 26.1 26.3 31.2
Annual Energy Consumption QHE GJ 74.9 74.9 74.9
Sound Power Level, Indoors LWA dB 45.2 45.5 44.2
Domestic Hot Water Qelec kWh 0.177 0.177 0.173
ƞWH % 75.3 75.6 76.3
Qfuel kWh 7.667 7.615 7.486
AEC kWh 37.8 37.7 36.9
AFC GJ 5.8 5.8 5.8
ERP DATA
 

3
Ideal Logic +Combi - Installation and Servicing
LOGIC + COMBINATION BOILER
Ideal Boilers
ERP DATA
SYMBOL UNITS MODEL
24 30 35
Condensing boiler Yes
Seasonal Space heating efciency class A
Rated heat output kW 24
Seasonal space heating energy efciency ƞson % 93*
Annual energy consumption QHE GJ 74.9
Sound power level, indoors LWA dB 45 45 44
Water heating energy efciency class A
 *%
 %
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 efciency of the package of products provided for in this document may not correspond to its actual energy efciency once installed in a
building, as the ef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 Efciency
(in %)
Tank rating
A* = 0.95
A = 0.91
B = 0.86
C = 0.83
D-G = 0.81

TOTAL: A+B+C=

= (‘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

4
Ideal Logic +Combi - Installation and Servicing

5
Ideal Logic +Combi - Installation and Servicing
.................................. A01 (Apr 15)
DOCUMENT AMENDMENTS
Ideal Boilers reserve the right to vary specication without notice
FOR ANY TECHNICAL QUERIES PLEASE RING THE IDEAL
INSTALLER HELPLINE : 01482 498704
NOTE. BOILER RESTART PROCEDURE -


NOTES FOR THE INSTALLER

6
Ideal Logic +Combi - Installation and Servicing
general
 24 30 35
Gas supply 2H - G20 - 20mbar
Gas Supply Connection 15mm copper compression
Injector Size (mm) 4.15 4.65 4.9
Inlet Connection Domestic Hot Water 15mm copper compression
Outlet Connection Domestic Hot Water 15mm copper compression
Flow Connection Central Heating 22mm copper compression
Return Connection Central Heating 22mm copper compression
Flue Terminal Diameter mm (in) 100 (4)
Average Flue Temp-Mass Flow Rate (DHW) 63oC - 11g/s 68oC - 13g/s 73oC - 15g/s
Maximum Working Pressure (Sealed Systems) bar (lb/in2) 2.5 (36.3)
Maximum Domestic Hot Water Inlet Pressure bar (lb/in2) (kPa) 10.0 (145) (1000)
Minimum Domestic Hot Water Inlet Pressure* bar (lb/in2) (kPa) 0.8 (11.6) (80) 1.3 (18.9) (130) 1.3 (18.9)** (130)
Electrical Supply 230 V ~ 50 Hz.
Power Consumption W 146 152 177
Fuse Rating External : 3A Internal : T4H HRC L250 V
Water content Central Heating litre (gal) 1.2 (0.26)
Domestic Hot Water litre (gal) 0.5 (0.11)
Packaged Weight kg (lb) 35.8 (79) 36.2 (79.8) 36.2 (79.8)
Maximum Installation Weight kg (lb) 31.4 (69.2) 31.8 (70.1) 31.8 (70.1)
Boiler Casing Size Height mm (in) 700 (27.5)
Width mm (in) 395 (15.5)
Depth mm (in) 278 (11)
Table 1 - General Data
Note. 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 different
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 ft3/h - divide the gross heat input (Btu/h)
by the gross C.V. of the gas (Btu/ft3)
c. For m3/h - multiply l/s by 3.6
Key to symbols
GB = United Kingdom IE = Ireland (Countries of destination)
PMS = Maximum operating pressure of water
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.
*Required for maximum ow rate. Boiler operates down to 2 l/min DHW delivery
** In areas of low water pressure the DHW restrictor can be removed
Maximum DHW Input : 24 30 35
Nett CV kW 24.3 30.4 35.4
(Btu/h) (82,900) (103,600) (120,900)
Gross CV kW 27.0 33.7 39.3
(Btu/h) (92,000) (115,000) (134,200)
Gas Consumption m3/h 2.512 3.135 3.657
(ft3/h) (89) (111) (129)
Maximum kW 24.2 30.3 35.3
DHW Output (Btu/h) (82,600) (103,300) (120,500)
DHW Flow Rate l/min 9.9 12.4 14.5
at 35°C temp. rise. (gpm) (2.2) (2.8) (3.2)
DHW Specic Rate l/min 11.5 14.5 16.9
(gpm) (2.5) (3.2) (3.7)
Boiler Input : Max. Min.
24 30 35
Boiler Input ‘Q’ Nett CV kW 24.3 4.9 6.1 7.1
(Btu/h) (82,900) (16,600 (20,700) (24,100)
Gross CV kW 27.0 5.4 6.7 7.9
(Btu/h) (92,000) (18,400) (23,000) (26,900)
Gas Consumption m3/h 2.512 0.500 0.627 0.734
(ft3/h) (89) (17.8) (22) (25.9)
Boiler Output :
Non Condensing kW 24.2 4.8 6.1 7.1
70oC Mean Water temp. (Btu/h) (82,600) (16,500) (20,700) (24,100)
Condensing kW 25.6 5.1 6.4 7.5
40oC Mean Water temp. (Btu/h) (87,400) (17,500) (21,800) (25,500)
Seasonal efciency* SEDBUK 2005 91% 91.1% 91%
Seasonal efciency* SEDBUK 2009 89% 89% 88.9%
NOx Classication CLASS 5
Table 2 - Performance Data - Central Heating Table 3 - Performance Data - Domestic Hot Water

7
Ideal Logic +Combi - Installation and Servicing
general
Boiler size G.C. Appliance No. PI No.

24 47-348-65 86 CL 08
30 47-348-66 86 CL 08
35 47-348-67 86 CL 08
CONTENTS
Air Supply .....................................................................11
 ................68-69
Boiler Clearances ....................................................... 12
 ........................................... 15
 ......................................11, 26, 27, 43
Electrical Connections ..........................................30-33
Electrical Supply ..........................................................11
Extension Ducts - Fitting ......................................19-22
 ..........................................................58-64
Flue Installation .....................................................19-25
Gas Safety Regulations ............................................... 9
Gas Supply .................................................................. 10
Installation ..............................................................15-40
Pump ........................................................................... 54
 ................................................................ 8
 ................................................................41-57
Spare Parts Info .......................................................... 65
 ....................................11
 ..........................................11,13,14
Water & Gas Connections ......................................... 28
Water Treatment ........................................................ 14
Wiring Diagram ........................................................... 34
Natural Gas only
Destination Country: GB, IE
Boiler Page
Make and model.........................................................7
Appliance serial no. on data badge ..........Front Cover
SEDBUK No. %..........................................................6
Controls
Time and temperature control to heating............31-33
Time and temperature control to hot water ........31-33
Heating zone valves................................................n/a
TRV’s........................................................................11
Auto bypass ............................................................. 11
Boiler interlock.......................................................... 11
For ....................................................................all boilers
Flushing to BS.7593.................................................14
Inhibitor ....................................................................14
Central heating mode
Heat input...................................................to be calculated
For assistance see Technical Helpline on the back page
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...........................................................14
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

Condensate drain...........................................26,27,43
For all boilers: complete, sign & hand over to customer
For GB, 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

INSTRUCTIONS WITH APPLIANCE
IDEAL LOGIC + COMBI

8
Ideal Logic +Combi - Installation and Servicing
general
INTRODUCTION
The Logic + Combi range of boilers are wall mounted, full
sequence, automatic spark ignition, low water content, fanned
ue, high efciency, condensing, combination gas boilers.
Note. Due to the high efciency of the boiler a plume of water
vapour will form at the terminal during operation.
Central heating (CH) output is fully modulating with a range of:
24 4.8 to 24.2kW (16,500 to 82,600 Btu/h)
30 6.1 to 24.2kW (20,700 to 82,600 Btu/h)
35 7.1 to 24.2kW (24,100 to 82,600 Btu/h)
Instantaneous domestic hot water (DHW) output is also fully
modulating with a maximum of :
24 24.2kW (82,600 Btu/h)
30 30.3kW (103,300 Btu/h)
35 35.3kW (120,500 Btu/h)
The boiler is supplied fully assembled with DHW plate heat
exchanger, diverter valve, circulating pump, pressure gauge,
safety valve and CH expansion vessel.
Variable CH and DHW temperature controls are tted on the user
control and the boiler features a DHW preheat facility.
The boiler includes as standard:
- Automatic bypass
- Boiler frost protection
- Daily pump and diverter valve exercise.
The boiler casing is of white painted mild steel.
The boiler temperature controls are visible 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.
Data Plate
The boiler model and serial number can be located on the bottom
of the boiler casing, shown in Frame 1 - Water & Gas Connection
Diagram.
OPERATION
With no demand for CH, the boiler res only when DHW is drawn
off, or periodically for a few seconds without any DHW draw-off, in
order to maintain the DHW calorier in a heated condition. This
only occurs if pre-heat knob is in the ‘ON’ period.
When there is a demand for CH, the heating system is supplied at
the selected temperature of between 45oC and 83oC, until DHW is
drawn off. The full output from the boiler is then directed via the
diverter valve to the plate heat exchanger to supply a nominal DHW
draw-off of
24 9.9 l/min at 35 oC temperature rise.
30 12.4 l/min at 35 oC temperature rise.
35 14.5 l/min at 35 oC temperature rise.
The DHW draw off rate specied above is the nominal that the
boiler ow regulator will give. Due to system variations and
seasonal temperature uctuations DHW ow rates/temperature rise
will vary, requiring adjustment at the draw off tap.
At low DHW draw-off rate the maximum temperature is limited to
64 oC by the modulating gas control.
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.
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.

9
Ideal Logic +Combi - Installation and Servicing
general
SAFETY

in force:
The appliance is suitable only for installation in GB and IE 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
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water byelaws in Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specic instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a Registered Gas
Installer (RGII) and installed in accordance with the current edition
of I.S.813 “Domestic Gas Installations”, the current Building
Regulations and reference should be made to the current ETCI
rules for electrical installation.
Detailed recommendations are contained in the following British
Standard Codes of Practice:
BS. 5440:1 Flues (for gas appliances of rated input not
exceeding 70 kW).
BS. 5440:2 Ventilation (for gas appliances of rated input not
exceeding 70 kW).
BSEN. 12828:2003 Heating Systems in buildings: Design for
water based heating systems.
BSEN 12831:2003 Heating Systems in buildings: Method for
calculation of the design heat load.
BSEN 14336:2004 Heating Systems in buildings: Installation
and commissioning of water based heating
systems.
BS. 5546 Installation of gas hot water supplies for domestic
purposes (2nd Family Gases)
BS. 6798 Installation of gas red hot water boilers of rated
input not exceeding 70 kW.
BS. 6891 Low pressure installation pipes.


The manufacturer’s notes must NOT be taken, in any way, as
overriding statutory obligations.
IMPORTANT. These appliances are CE certicated for safety
and performance. It is, therefore, important that no external
control devices, e.g. ue dampers, economisers etc., are
directly connected to these appliances unless covered by
these Installation and Servicing Instructions or as otherwise
recommended by  in writing. If in doubt please
enquire.
Any direct connection of a control device not approved by 
Boilers could invalidate the certication and the normal appliance
warranty. It could also infringe the Gas Safety Regulations and
the above regulations.
SAFE HANDLING OF SUBSTANCES
No asbestos, mercury or CFCs are included in any part of the
boiler or its manufacture.
OPTIONAL EXTRA KITS
  (1000mm long)
• Horizontal Flue Terminal 600mm long
 
• Flue Extension Ducts (1000mm long)
• Flue Extension Ducts (2000mm long)
• Flue Extension Ducts (500mm long)
24-up to 9m
30-up to 8m
35-up to 6m
• 
• 90o(maximum per installation)
24-upto 6 elbows
30-upto 6 elbows
35-upto 4 elbows
• 45o(maximum per installation)
24-upto 6 elbows
30-upto 6 elbows
35-upto 4 elbows
• Roof Flue Kit (to a maximum of 7.5m)
• (5m primary and 17m secondary
is a typical maximum length. For alternative details refer to
Powered Vertical Instructions)
• 
• 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

10
Ideal Logic +Combi - Installation and Servicing
general
GAS SUPPLY
The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an adequate
supply of gas. An existing service pipe must NOT be used without
prior consultation with the local gas supplier.
The boiler MUST be installed on a gas supply with a governed
meter only.
A gas meter can only be connected by the local gas supplier or
by a Gas Safe Registered Engineer. In IE by a Registered Gas
Installer (RGII).
An existing meter should be checked, preferably by the gas
supplier, to ensure that the meter is adequate to deal with the rate
of gas supply required.
It is the responsibility of the Gas Installer to size the gas installation
pipework in accordance with BS6891:2005. Whilst the principle of
the 1:1 gas valve ensures the Logic + range is able to deliver it’s
full output at inlet pressures as low as 14mb, other gas appliances
in the property may not be as tolerant. When operating pressures
are found to be below the minimum meter outlet of 19mb 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 BS 6400-1 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.
0
0.5
1
1.5
2
2.5
3
010 20 30 40 50
Pressure drop (mbar )
Heat Input to Boiler (kW)
Gas Cock Pressure Drop
IMPORTANT.
Installation pipes must be tted in accordance with BS.6891. In IE
refer to IS.813:2002.
The complete installation MUST be tested for gas tightness and
purged as described in the above code.
FLUE INSTALLATION
Pluming will occur at the terminal so terminal positions where this
could cause a nuisance should be avoided.
The ue must be installed in accordance with the recommendations
of BS. 5440-1: 2008.
In IE refer to I.S. 813:2002.
The following notes are intended for general guidance:
1. The boiler MUST be installed so that the terminal is exposed to
external air.
2. It is important that the position of the terminal allows the free
passage of air across it at all times.
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.
For electrical safety reasons there must be no access available
from the back of the boiler.
The boiler must not be tted outside.

If the boiler is to be tted in a timber framed building it should be
tted in accordance with the Institute of Gas Engineering document
IGE/UP/7:2006 - Edition 2.

This appliance is rated IP20.
The boiler may be installed in any room or internal space, although
particular attention is drawn to the requirements of the current
IEE (BS.7671) Wiring Regulations and the electrical provisions
of the building regulations applicable in Scotland, with respect to
the installation of the boiler in a room or internal space containing
a bath or shower. For IE reference should be made to the current
ETCI rules for electrical installations and I.S. 813:2002.
If the appliance is to be installed in a room containing a bath or
shower then, providing water jets are not going to be used for
cleaning purposes (as in communal baths/showers), the appliance
must be installed beyond Zone 2, as detailed in BS.7671.
0.6m
Zone 0
Recessed
window
Zone 2
Ceiling
3G8913a
2.25m
Zone 1
Compartment Installations
A compartment used to enclose the boiler should be designed and
constructed specially for this purpose.
An existing cupboard or compartment may be used, provided that
it is modied for the purpose.
In both cases, details of essential features of cupboard /
compartment design, including airing cupboard installation, are to
conform to the following:
• BS 6798 (No cupboard ventilation is required - see ‘Air Supply’
for details).
• The position selected for installation MUST allow adequate
space for servicing in front of the boiler.
• For the minimum clearances required for safety and
subsequent service, see the wall mounting template and
Frame 1. In addition, sufcient space may be required to
allow lifting access to the wall mounting plate.