Ideal Heating LOGIC COMBI2 C24 Installation & Servicing
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Ideal Heating LOGIC COMBI2 C24 Installation & Servicing

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INSTALLATION
& SERVICING
LOGIC COMBI
2
C24 C30 C35
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.
October 2022
UIN 228296 A06

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Summary of Contents for Ideal Heating LOGIC COMBI2 C24

  • Page 1 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.
  • Page 2 ERP DATA MODEL SYMBOL UNITS 24 kW 30 kW 35 kW Condensing Boiler Low Temperature Boiler B1 Boiler Cogeneration Space Heater Equipped with a Supplementary Heater Combination Heater Nominal Heat Output for Space Heating Full Load 24.3 24.3 24.3 Part Load Auxiliary Electricity Consumption Full Load elmax...
  • Page 3 PRODUCT FICHE LOGIC COMBI C BOILER Ideal Heating ERP DATA SYMBOL UNITS MODEL 24 kW 30 kW 35 kW Condensing boiler Seasonal space heating efficiency class Rated heat output Seasonal space heating energy efficiency ƞs Annual energy consumption Sound power level, indoors...
  • Page 4 NOTES FOR THE INSTALLER 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. DEFINITIONS WARNING: Risk of injury or death CAUTION: Risk of damage to objects IMPORTANT: Important information...

  • Page 5: Table Of Contents

    CONTENTS Section 1 - General .................6 Section 3 - Servicing ................35 Introduction ................8 Servicing Schedule ..............35 Operation ..................8 Removal / Replacement of Components ........36 Safe Handling ................8 Draining the Boiler ..............36 Optional Accessories ..............8 Boiler Front Panel Removal / Replacement ......37 Safety..................9 Flue Manifold Removal/Replacement ........37 Safe Handling of Substances ...........9...

  • Page 6: Section 1 - General

    Section 1 - General Table 1 General Data 24 kW 30 kW 35 kW Gas Supply 2H - G20 - 20 mbar Gas Supply Connection 15 mm copper compression Injector Size 4.15 4.65 Inlet Connection Cold Water 15 mm copper compression Outlet Connection Cold Hot Water 15 mm copper compression...
  • Page 7 Section 1 - General LOGIC COMBI Natural Gas Only BOILER SIZE G.C. Applicance No (Benchmark No.) 47-349-93 47-349-94 47-349-95 Destination Country: For UK, to comply with Building Regulations Part L1 (Part 6 in Scotland) the boiler should be fitted in accordance with the manufacturer’s instructions.

  • Page 8: Introduction

    Section 1 - General INTRODUCTION When there is a demand for CH, the heating system is supplied at the selected temperature of between 30 C and C, until DHW is drawn off. The full output from the boiler is The Logic Combi range of boilers are wall mounted, then directed via the diverter valve to the plate heat exchanger to supply a nominal DHW draw-off of...

  • Page 9: Safety

    Do not connect external control devices Bathroom Installations directly to this appliance unless recommended in this manual or by Ideal Heating in writing. If in doubt, please enquire. [0] Zone 0 [1] Zone 1 Unapproved control devices could invalidate the warranty of this [2] Zone 2 appliance and infringe the Gas Safety Regulations.

  • Page 10: Air Supply

    Section 1 - General Compartment Installations The complete installation MUST be tested for gas tightness and purged as described, for the majority of installations the A boiler installed in a compartment does not require ventilation. appropriate standard is IGEM/UP/1B [23], but alternatively However, A boiler installed in a compartment must provide IGEM/UP/1 [21] or IGEM/UP/1A [22], as appropriate, can be adequate clearances for servicing.

  • Page 11: Boiler Dimensions, Services & Clearances

    Section 1 - General 1.14 BOILER DIMENSIONS, SERVICES & CLEARANCES Refer to Section 2.17 Side and Rear Flue The boiler connections are made on the boiler connection a. Provided that the flue hole is cut accurately, e.g. with a core tails.

  • Page 12: System Requirements - Central Heating

    Section 1 - General 1.15 SYSTEM REQUIREMENTS - CENTRAL HEATING Table 4 Vessel Sizing The method of filling, refilling, topping up or flushing sealed primary hot water circuits from the mains via a temporary hose connection is only PRV setting allowed if acceptable to the local water authority.

  • Page 13: System Requirements - Dhw

    Central Heating Systems. The mains cold water feed can come from a water softener If water treatment is used Ideal Heating recommend only the as the materials used in the domestic hot water circuit are use of SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEY MC1, fully resistant to any chemicals in softened water.

  • Page 14: Section 2 - Installation

    Section 2 - Installation BOILER ASSEMBLY - EXPLODED VIEW CH Return Valve Return Group Manifold Gasket - Burner Control Box Lid CH Flow Valve Flow Group Manifold Sump Clean Out Cover Control Box Front DHW Inlet & Outlet Plate Heat Exchanger Flue Manifold Blank Insert Filling Loop Pipe...

  • Page 15: Unpacking

    Section 2 - Installation UNPACKING Unpack and check the contents The boiler is supplied fully assembled in Pack A. Pack A Contents Boiler Hardware Pack Box Wall Mounting Plate These Installation/Users Instructions Boiler Warranty Wall Mounting Template Hardware Pack Box Contents HP Box Dividers - 289 x 111 x 57.5 mm Plug Male and Clip Pipe DHW Outlet...

  • Page 16: Wall Mounting Template

    Section 2 - Installation WALL MOUNTING TEMPLATE Extended centre line “A” 1 5 5 (2 0 0 ) The wall mounting template is located on the internal protective packaging. The template shows the position of the fixing and rear flue centre holes for a standard installation Care MUST be taken to ensure the correct holes are drilled.

  • Page 17: Flues And Locations

    Section 2 - Installation FLUES AND LOCATIONS This installation & servicing manual must be read in conjunction with flue kit and fitting guide. Flue deflector Vertical flue Telescopic Horizontal flue Flue extension terminal and horizontal flue 0.6 or 0.8 m 0.5 m, 1 m or 2 m connector 0.5 or 0.7 m...

  • Page 18: Flues And Locations - Cont

    Section 2 - Installation FLUES AND LOCATIONS - CONTINUED B = Top Clearance Flue systems that require extension kits must be installed with a 1.5° decline from the flue terminal back to the boiler. Top Clearance is measure from the top of the turret to the top of the hole where the flue terminates.

  • Page 19: Horizontal Flue Positions

    Section 2 - Installation HORIZONTAL FLUE POSITIONS Facing the boundary Opening in adjacent building Boundary a. < 1000 300 c. 600 d. 300 b. Parallel to the boundary At an angle to the boundary All measurements : mm Refer to Table 5 2.10 VERTICAL FLUE POSITIONS Height Difference ‘A’...

  • Page 20: Flue System Dimensions

    Section 2 - Installation 2.11 FLUE SYSTEM DIMENSIONS 2.12 FITTING THE TURRET 1. Ensure the condensate trap in filled with water Flue Design 2. Ensure the rubber seal is not damaged and fitted IMPORTANT: correctly on the appliance manifold. 1. Flue lengths may vary, always measure flue lengths 3.

  • Page 21: Cutting The Flue

    Section 2 - Installation 2.13 CUTTING THE FLUE 10 mm Adjust to Length = “A” + 44 mm from terminal lip +14 mm CUTTING HORIZONTAL FLUE TERMINAL (non-telescopic) +14 mm Wall Thickness 1. Measure the required cut flue length (A + 44 mm) 2.

  • Page 22: Assembling The Vertical Flue

    Section 2 - Installation For the full range of A video showing how to correctly SCAN SCAN measure and fit a flue can be FLUE AND ACCESSORIES for Flue Fitting for Flues and found by viewing the QR Code. please visit idealheating.com/ Video’s Accessories Guide flues...

  • Page 23: Condensate Drain

    Section 2 - Installation 2.15 CONDENSATE DRAIN External Drain Connections The use of an externally run condensate drainage pipe should only be considered after exhausting all internal termination options as described previously. An external system must terminate at a suitable foul water discharge point or purpose designed soakaway.

  • Page 24: Condensate Drain - Cont'd

    Section 2 - Installation 2.16 CONDENSATE DRAIN - CONT’D Figure 2 - Connection of a Condensate Drainage Pipe Figure 1 - Connection of Condensate Drainage Pipe to Downstream of a Sink, Basin, Bath or Shower Water Trap to Internal Soil & Vent Stack Internal Soil Vent Stack Boiler Boiler...

  • Page 25: Connections & Filling

    Section 2 - Installation 2.17 CONNECTIONS & FILLING PRV DRAIN CAUTION: Heating the isolation valves may damage the fibre seals The PRV connection, located at the bottom left-hand side of the boiler, comprises an open ended grommet. Fit each union with the fibre seals provided. IMPORTANT The grommet is designed for 15 mm Ø...

  • Page 26: Connections & Filling Continued

    Section 2 - Installation 2.18 CONNECTIONS & FILLING CONTINUED FILLING WARNING: Protect electrical connections from water Connect the filling loop, ensuring the washers are in Top Up place. Connect the filling loop, ensuring the washers are in Loosen the auto air vent dust cap. place.

  • Page 27: Electrical Connections

    Section 2 - Installation 2.19 ELECTRICAL CONNECTIONS Wiring should be 3 core PVC insulated cable, not less WARNING: This appliance must be earthed (24 x 0.2 mm), and to BS EN 50525-1:2011 than 0.75 mm Table 16. A mains supply of 230 V ~ 50 Hz is required. Connection must be made in a way that allows complete 3 A fuse required.

  • Page 28: External Wiring

    Section 2 - Installation 2.21 EXTERNAL WIRING External Controls – 230 V 50 Hz Frost Protection If parts of the pipework run outside the house or if the Wiring a 230V Programmable Room Stat (Diagrams A & C) boiler will be left off for more than a day or so then a frost or 230V Timer &...

  • Page 29: Wiring Diagram

    Section 2 - Installation 2.22 WIRING DIAGRAM Installation and Servicing...

  • Page 30: Replacing Pre-Fitted Mains Cable

    Section 2 - Installation 2.23 REPLACING PRE-FITTED MAINS CABLE If it is necessary to use an alternative mains cable to the one Strain pre-fitted then use the following guide. Relief Replacement wiring should comply with notes and be carried out by a qualified person. Refer to Section 2.20 1.

  • Page 31: Initial Lighting

    Section 2 - Installation 2.25 INITIAL LIGHTING Legend A. Domestic Hot Water Temperature Knob B. Central Heating Temperature Knob C. Mode Button D. Boiler Status Display E. Burner On indicator F. Restart Button G. CH Flow Isolating Valve H. Gas Inlet Pressure Test point Gas Service cock J.

  • Page 32: The Display

    Section 2 - Installation 2.26 THE DISPLAY 2.27 GENERAL CHECKS Make the following checks for correct operation in: The user control has one display to inform the user about the status of the boiler. The display shows the status of the 1.

  • Page 33: General Checks - Water Circulation

    Section 2 - Installation 2.28 GENERAL CHECKS - WATER CIRCULATION WATER CIRCULATION SYSTEM WATER TEMPERATURES 1. With the system COLD, check that the initial pressure is Temperatures can be selected using the CH and DHW correct to the system design requirements. thermostats.

  • Page 34: Accessing The Installer Mode

    Section 2 - Installation 2.30 ACCESSING THE INSTALLER MODE To access Installer Mode, press the “MODE” and “RESTART” for 30s before ramping down to minimum rate over 60s and buttons together for more than 5s. then running at minimum rate for 10 minutes. If the return temperature is more than 40°C the burner will immediately 1.

  • Page 35: Section 3 - Servicing

    Section 3 - Servicing SERVICING SCHEDULE WARNING: Servicing can only be carried out by Gas Safe Registered Engineers Always turn OFF the gas supply at the gas service cock, and switch OFF and disconnect the electricity supply to the appliance before servicing Combustion testing must be carried out by a competent person using a combustion analyser conforming to BS EN 50379-3:2012.

  • Page 36: Removal / Replacement Of Components

    Section 3 - Servicing REMOVAL / REPLACEMENT OF COMPONENTS WARNING: Do not operate the boiler without a front panel fitted Notes. When replacing any component. 1. In order to assist fault finding, the control panel has an 1. Isolate the electricity supply. LCD diagnostic display.

  • Page 37: Boiler Front Panel Removal / Replacement

    Section 3 - Servicing BOILER FRONT PANEL REMOVAL / REPLACEMENT REMOVAL REPLACEMENT 1. Loosen the two screws retaining the front panel. 3. Hook the panel onto the top retaining clips. 2. Pull the two clips down to disengage and pull panel 4.

  • Page 38: Fan And Venturi Assembly Removal And Cleaning

    Section 3 - Servicing FAN AND VENTURI ASSEMBLY REMOVAL AND CLEANING 1. Disconnect the electrical leads from the fan. 9. Inspect fan outlet sealing gasket and replace if necessary. 2. Remove the clip from the gas control valve outlet and 10.

  • Page 39: Burner Removal And Cleaning

    Section 3 - Servicing BURNER REMOVAL AND CLEANING SCAN for video Refer to Section 1. Remove the 2 burner front fixing screws and the 4. Pull the burner out from the left hand side of the boiler once it is in the vertical 2 rear extended nuts.

  • Page 40: Ignition / Detection Electrode Replacement / Inspection

    Section 3 - Servicing IGNITION / DETECTION ELECTRODE REPLACEMENT / INSPECTION Refer to Section Ignition /Detection Electrode 1. Remove the fan. Refer to Section 2. Remove the flue manifold. 3. Remove the burner. Refer to Section 3.13 4. When servicing the boiler inspect the condition of the electrode and check the dimensions shown.

  • Page 41: Dhw Filter & Dhw Flow Regulator Cleaning/Replacement

    Section 3 - Servicing 3.11 DHW FILTER & DHW FLOW REGULATOR CLEANING/REPLACEMENT 3. Using a pair of pliers, pull out the plastic filter/flow Refer to Section regulator. 4. Clean or replace filter as necessary. 1. Isolate the DHW system. Refer to Section 5.

  • Page 42: Return Thermistor Replacement

    Section 3 - Servicing 3.14 RETURN THERMISTOR REPLACEMENT Refer to Section 1. Isolate and drain down the boiler. 2. Remove the clip from the pump housing and remove the thermistor. 3. Disconnect the electrical lead from the thermistor. 4. Reconnect the electrical lead to the new thermistor and reassemble, ensuring that the thermistor is fully engaged and the clip is correctly located.

  • Page 43: Gas Control Valve Replacement

    Section 3 - Servicing 3.16 GAS CONTROL VALVE REPLACEMENT Refer to Section 1. Disconnect and remove the trap and rubber connector. Refer to Section 3.19 2. Unplug the electrical lead connection from the gas control valve. 3. Remove the outlet gas valve clip and slide the pipe upwards.

  • Page 44: Condensate Trap Replacement / Cleaning

    Section 3 - Servicing 3.19 CONDENSATE TRAP REPLACEMENT / CLEANING Refer to Section 3.10 3.18 PRIMARY PCB REPLACEMENT It is critical that the correct boiler size WARNING: and fuel type is entered in to the boiler. CAUTION: Fit the earth strap provided with the PCB to your wrist and secure to a suitable earth on the boiler chassis.

  • Page 45: Dhw Flow Turbine Sensor Replacement

    Section 3 - Servicing 3.20 DHW FLOW TURBINE SENSOR REPLACEMENT Refer to Section 3. Using a suitable tool, lift and remove the retaining clip. 4. Use the clip to ease the turbine sensor from its housing. 1. Drain the DHW system. 5.

  • Page 46: Prv Replacement

    Section 3 - Servicing 3.22 PRV REPLACEMENT SCAN for video 7. Check the operation of the PRV by Refer to Section raising the water pressure until the valve lifts. This should occur within 0.3 1. Drain the boiler. bar of the preset lift pressure. Refer to Section 8.

  • Page 47: Replacement Of Dhw Thermistor

    Section 3 - Servicing 3.24 REPLACEMENT OF DHW THERMISTOR Refer to Section 4. Fit the replacement thermistor and reassemble. 5. Reestablish the DHW supply, turn on a hotwater tap checking for leaks 1. Isolate the DHW system 2. Remove the retaining clip and extract the thermistor. Be prepared for some water release.

  • Page 48: Diverter Valve Body Assembly Replacement

    Section 3 - Servicing 3.26 DIVERTER VALVE BODY ASSEMBLY REPLACEMENT Refer to Section To remove the valve body assembly: 9. Loosen the nut above pump and rotate the pipe. 1. Drain the boiler. 10. If required remove expansion vessel connection hose. Refer to Section Refer to Section 3.31...

  • Page 49: Pump Head Replacement

    Section 3 - Servicing 3.27 PUMP HEAD REPLACEMENT Refer to Section 1. Drain the boiler. Refer to Section 2. Disconnect the two electrical leads from the pump. 3. Remove the 4 hex screws retaining the pump head. 4. Remove the pump head. Be aware of water spillage.

  • Page 50: Flow Thermistor Replacement

    Section 3 - Servicing 3.29 FLOW THERMISTOR REPLACEMENT Refer to Section 1. Drain down the boiler. 5. Reassemble. Refer to Section 6. Refill the boiler. Refer to Section 2.17 2. Unplug the electrical lead. 3. Remove the clip from the flow pipe and remove the thermistor.

  • Page 51: Heat Engine Replacement

    Section 3 - Servicing 3.30 HEAT ENGINE REPLACEMENT Refer to Section 17. Reassemble, ensuring the heat exchanger is located 2.27 correctly in the LHS retaining bracket. Replace any new ‘O’ rings supplied with new heat exchanger and replace CAUTION: Protect the gas and electrical controls with gaskets or seals if any sign of damage is evident.

  • Page 52: Expansion Vessel Recharging & Replacement

    Section 3 - Servicing 3.31 EXPANSION VESSEL RECHARGING & REPLACEMENT Refer to Section RECHARGING 1. Remove the charge point cover. 2. Recharge the tank pressure to 0.75 bar. 3. Reassemble. 4. Check that the boiler operates in both DHW & CH modes. REPLACEMENT 5.

  • Page 53: Section 4 - Fault Finding

    Section 4 - Fault Finding FAULT FINDING MAIN MENU ‘L 01’ Go to Section 4.2: Flow Temperature Overheat Lockout ‘L 02’ Go to Section 4.3: Ignition Lockout ‘L 0C’ 5 Restarts within 15 minutes: Turnpower off & on ‘L 06’ Go to Section 4.4: False Flame Lockout ‘F 01’...

  • Page 54: L 01' - Overheat Lockout

    Section 4 - Fault Finding ‘L 01’ - OVERHEAT LOCKOUT Is the Boiler and CH System filled with water and all Fill and vent the system and open all isolation, system filter and radiator valves open? isolation valves, then restart boiler Is the Flow/Return Differential across the Boiler in Check that the Pump is rotating freely.

  • Page 55: L 06' - Flame On Before Gas Valve On

    Section 4 - Fault Finding ‘L 06’ - FLAME ON BEFORE GAS VALVE ON Check routing and integrity of internal boiler wiring is OK. Restart the boiler, does Boiler Work OK? Check condition of Electrode and replace if deteriorated. Replace Electrode ‘F 01’...

  • Page 56: F 03' - Fan Fault

    Section 4 - Fault Finding ‘F 03’ - FAN FAULT Does the wiring from the Fan to the PCB have Rectify Wiring & secure connections at both ends and has not deteriorated? Does the wiring have continuity? connections Replace PCB Is there 230 VAC at the Blue and Brown connections to the 3 way connection on the Fan? Replace Fan...

  • Page 57: F 05 Or L 05' - Return Thermistor Fault

    Section 4 - Fault Finding ‘F 05 OR L 05’ - RETURN THERMISTOR FAULT Pump Housing Check the resistance using a suitable multimeter connected across the thermistor’s terminal pins. Fit a new Thermistor Resistance kΩ Temperature 9.7 – 10.3 2.4 – 2.6 1.0 –...

  • Page 58: No Ch Operation But Dhw Works Ok

    Section 4 - Fault Finding 4.11 NO CH OPERATION BUT DHW WORKS OK Press Mode button until “Off” not shown Is “Off” shown underneath the radiator on the display? Refer to Section 2.25 Are CH Timer and Room Thermostat switched on? Switch CH Timer and Room Thermostat On Are the Radiator Valves Open? Open the Radiator Valves...

  • Page 59: No Dhw But Ch Works Ok

    Section 4 - Fault Finding 4.12 NO DHW BUT CH WORKS OK Are hot & cold pipe work crossed? When a tap is turned on does 00 change to Correct pipe work a temperature? Re-connect wiring Is wiring connected between PCB &...

  • Page 60: No Display

    Section 4 - Fault Finding 4.13 NO DISPLAY Is there 230Vac to the boiler at L and N? Supply power to the boiler Is the wiring from the terminal block to the PCB Connect the wiring from the terminal block to the connected securely? PCB securely.

  • Page 61: Section 5 - Spare Parts

    Section 5 - Spare Parts When replacing any part on this appliance use only spare parts that you can be assured conform to the safety LINK and performance specification that we require. Do not use reconditioned or copy parts that have not been clearly to spares authorised by Ideal.

  • Page 62: Section 6 - Benchmark To Commissioning

    Section 6 - Benchmark to Commissioning Installation and Servicing...
  • Page 63 Section 6 - Benchmark to Commissioning Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturers’ instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation.
  • Page 64 Section 6 - Benchmark to Commissioning GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Optional: Building Regulations Notification Number (if applicable): Time, temperature control and boiler interlock provided for central heating and hot water...
  • Page 65 Section 6 - Benchmark to Commissioning SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’...
  • Page 66 Section 6 - Benchmark to Commissioning FLOWCHART FOR CO LEVEL AND COMBUSTION RATIO CHECK ON COMMISSIONING A CONDENSING BOILER Important Preliminary Information on Checks The air gas ratio valve is factory-set and must not be adjusted DURING COMMISSIONING. If the boiler requires conversion to operate with a different gas family (e.g. conversion from natural gas to LPG) separate guidance is provided with the conversion kit supplied and this must be followed.
  • Page 67 Section 6 - Benchmark to Commissioning Start Set Boiler to Maximum Gas Rate. Refer to Carry Out Flue Integrity Check Using Analyser. Page 66 In accordance with boiler instructions, set Insert analyser probe into air inlet test point (where boiler to operate at maximum rate (full load available) and allow readings to stabilise.
  • Page 68 Notes Installation and Servicing...
  • Page 69 Notes Installation and Servicing...
  • Page 70 At Ideal Heating we take our environmental impact seriously, therefore when installing any Ideal Heating product please make sure to dispose of any previous appliance in an environmentally conscious manner. Households can contact their local authority to find out how.

This manual is also suitable for:

Logic combi2 c30Logic combi2 c35Logic+ combi2 c24

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