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INSTALLATION
& SERVICING
LOGIC MAX 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 228290 A06
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Table of Contents
Related Manuals for Ideal Heating LOGIC MAX COMBI 2 C24
Summary of Contents for Ideal Heating LOGIC MAX COMBI 2 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 MAX 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 ƞ Seasonal space heating energy efficiency Annual energy consumption Sound power level, indoors...
- Page 4 IE - Ireland RHS - Right Hand Side ETCI - Electro-Technical Council of Ireland LHS - Left Hand Side BS - British Standard PCB - Printed Circuit Board Ideal Heating reserve the right to vary specification without notice Installation and Servicing...
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Page 5: Table Of Contents
CONTENTS Section 1 - General ..................6 Section 3 - Servicing ................. 36 Introduction ................... 8 Servicing Schedule ..............36 Operation ..................8 Removal / Replacement of Components ........37 Safe Handling ................8 Draining the Boiler ..............37 Optional Accessories ..............8 Boiler Front Panel Removal / Replacement ........ -
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 MAX COMBI Natural Gas Only BOILER SIZE G.C. Applicance No (Benchmark No.) 47-387-03 47-387-04 47-387-05 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.
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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 Max Combi C range of boilers are wall mounted, then directed via the diverter valve to the plate heat exchanger condensing, combination gas boilers. -
Page 9: Safety
Do not connect external control devices [0] Zone 0 directly to this appliance unless recommended in this manual or by Ideal Heating in writing. If in doubt, please enquire. [1] Zone 1 [2] Zone 2 Unapproved control devices could invalidate the warranty of this [2*] Without the end wall, zone 2 must extend 600 mm from the bath appliance and infringe the Gas Safety Regulations. -
Page 10: Air Supply
Section 1 - General Compartment Installations Installation pipes must be fitted in accordance with BS6891. A boiler installed in a compartment does not require ventilation. The complete installation MUST be tested for gas tightness However, A boiler installed in a compartment must provide and purged as described, for the majority of installations the adequate clearances for servicing. -
Page 11: Boiler Dimensions, Services & Clearances
Section 1 - General 1.14 BOILER DIMENSIONS, SERVICES & CLEARANCES Refer to Section 2.17 The boiler connections are made on the boiler connection Side and Rear Flue tails. a. Provided that the flue hole is cut accurately, e.g. with a core drill, the flue can be installed from inside the building where The following minimum clearances must be maintained wall thicknesses do not exceed 600 mm. -
Page 12: System Requirements - Central Heating
Section 1 - General 1.15 SYSTEM REQUIREMENTS - CENTRAL HEATING Table 4 Vessel Sizing a. The method of filling, refilling, topping up or flushing sealed primary hot water circuits from the mains via a temporary hose connection is only allowed if acceptable to the local PRV setting water authority. -
Page 13: System Requirements - Dhw
IMPORTANT The application of any other treatment be necessary - however the use of artificially softened to this product may render the guarantee of Ideal Heating water is NOT permitted. invalid. 4. Under no circumstances should the boiler be fired before The Ideal System Filter will aid against the build up of iron the system has been thoroughly flushed. -
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 Blank Insert Flue Manifold Filling Loop Pipe... -
Page 15: Unpacking
Section 2 - Installation UNPACKING The boiler is supplied fully assembled in Pack A. Unpack and check the contents Pack A Contents Boiler Hardware Pack Box Wall Mounting Plate These Installation/Users Instructions Boiler Warranty Wall Mounting Template PRV Pipe Ideal System Filter Hardware Pack Box Contents HP Box Dividers - 289 x 111 x 57.5 mm... -
Page 16: Wall Mounting Template
Section 2 - Installation WALL MOUNTING TEMPLATE Extended centre line “A” 1 5 5 (2 0 0 ) IMPORTANT: Ensure the wall where the boiler will be is flat. The wall mounting template is located on the internal protective packaging. The template shows the position of the Refer to Section fixing and rear flue centre holes for a standard installation. -
Page 17: Flues And Locations
Section 2 - Flue 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 0.6 or 0.8 m terminal and horizontal flue 0.5 m, 1 m or 2 m 0.5 or 0.7 m connector... -
Page 18: Flues And Locations - Continued
Section 2 - Flue Installation FLUES AND LOCATIONS - CONTINUED B = Top Clearance Flue systems that require extension kits must be installed Top Clearance is measure from the top of the turret to the top with a 1.5° decline from the flue terminal back to the boiler. of the hole where the flue terminates. -
Page 19: Horizontal Flue Positions
Section 2 - Flue 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 - Flue Installation 2.11 FLUE SYSTEM DIMENSIONS 2.12 FITTING THE TURRET Flue Design 1. Ensure the condensate trap in filled with water IMPORTANT: 2. Ensure the rubber seal is not damaged and fitted correctly on the appliance manifold. 1. -
Page 21: Cutting The Flue
Section 2 - Flue Installation 2.13 CUTTING THE FLUE 10 mm Adjust to Length = “A” + 44 mm from terminal lip CUTTING HORIZONTAL FLUE TERMINAL +14 mm (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 - Flue Installation For the full range of A video showing how to correctly SCAN SCAN FLUE AND ACCESSORIES measure and fit a flue can be for Flue Fitting for Flues and found by scanning the QR Code. please visit idealheating.com/flues Video’s Accessories Guide... -
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
Section 2 - Installation 2.16 CONDENSATE DRAIN - CONT. 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 Cont
Section 2 - Installation 2.18 CONNECTIONS & FILLING CONT. FILLING WARNING: Protect electrical connections from water Top Up Connect the filling loop, ensuring the washers are in 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 than WARNING: This appliance must be earthed 0.75 mm (24 x 0.2 mm), and to BS6500 Table 16. Connection must be made in a way that allows complete A mains supply of 230 V ~ 50 Hz is 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 230 V Programmable Room Stat (Diagrams A & C) boiler will be left off for more than a day or so then a frost or 230 V 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 Strain If it is necessary to use an alternative mains cable to the one Relief pre-fitted then use the following guide. Replacement wiring should comply with notes and be carried out by a qualified person. Refer to Section 2.21 1. -
Page 31: Initial Lighting
Section 2 - Installation 2.25 INITIAL LIGHTING Legend A. Domestic Hot Water Temperature Knob B. Central Heating Temperature Knob On at 60°C Ready Radiator Target 60°C Target 60°C Room Thermostat or Timer Off C. Hot Keys Preheat Menu Mode D. Boiler Status Display E. -
Page 32: User Interface Commissioning
Set your contact details for Vent the system? boiler service? (defaults to Ideal Heating contact information otherwise) 2.27 CHANGING BOILER OPERATING MODE The boiler mode is displayed by default, to change the mode, simply press mode and select the desired mode. -
Page 33: Menu Operation
Section 2 - Installation 2.30 MENU OPERATION The menu option contains a list of attributes that show the operating state of the boiler. The installer should scroll down the menu and press enter to select the desired option. Menu Service Contact Name Service Phone Number Change Service Time Note. -
Page 34: General Checks
Section 2 - Installation 2.32 GENERAL CHECKS Make the following checks for correct operation in: 1. Fully open all DHW taps in turn and ensure that water Ready Ready Radiator Target flows freely from them. Target 60°C 60°C The display should show: Room Thermostat or Timer Off Preheat... -
Page 35: Restart Procedure
Section 2 - Installation 2.33 RESTART PROCEDURE To restart the boiler, press the Restart button. Ignition Lockout 1 Check other gas appliances work. Ignition Lockout 2 Restart boiler. 1 Check other gas appliances work. 2 Restart boiler. 3 If fault persists, contact installer. 3 If fault persists, contact installer. -
Page 36: 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 37: 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 38: Boiler Front Panel Removal / Replacement
Section 3 - Servicing BOILER FRONT PANEL REMOVAL / REPLACEMENT REMOVAL REPLACEMENT 1. Loosen the two screws retaining the front panel. 4. Hook the panel onto the top retaining clips. 2. Pull the two clips down to disengage and pull panel 5. -
Page 39: 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 40: Burner Removal And Cleaning
Section 3 - Servicing BURNER REMOVAL AND CLEANING SCAN for video Refer to Section 4. Pull the burner out from the left hand 1. Remove the 2 burner front fixing screws and the side of the boiler once it is in the vertical 2 rear extended nuts. -
Page 41: 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 3.14 4. When servicing the boiler inspect the condition of the electrode and check the dimensions shown. -
Page 42: Burner Injector Replacement
Section 3 - Servicing 3.11 BURNER INJECTOR REPLACEMENT Refer to Section 3.12 DHW FILTER & DHW FLOW REGULATOR CLEANING/REPLACEMENT 2. Turn the housing anti clockwise and pull forward to Refer to Section remove the cartridge. Be prepared for some water release. -
Page 43: Burner Replacement
Section 3 - Servicing 3.14 BURNER REPLACEMENT SCAN for video Refer to Section 3.2 & 3.7 3.15 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. -
Page 44: Gas Control Valve Replacement
Section 3 - Servicing 3.17 GAS CONTROL VALVE REPLACEMENT Refer to Section 1. Disconnect and remove the condensate 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 45: Primary Pcb Replacement
Section 3 - Servicing 3.20 PRIMARY PCB REPLACEMENT Press Select to confirm & the following screen is shown: WARNING: It is critical that the correct boiler size and fuel type is entered in to the boiler. Program this model? CAUTION: Fit the earth strap provided with the PCB Combi 24 kW to your wrist and secure to a suitable earth on the Natural Gas... -
Page 46: Dhw Flow Turbine Sensor Replacement
Section 3 - Servicing 3.21 DHW FLOW TURBINE SENSOR REPLACEMENT 3. Using a suitable tool, lift and remove the retaining clip. Refer to Section 4. Use the clip to ease the turbine sensor from its housing. 1. Drain the DHW system. 5. -
Page 47: Prv Replacement
Section 3 - Servicing 3.23 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 bar of 1. Drain the boiler. the preset lift pressure. -
Page 48: Replacement Of Dhw Thermistor
Section 3 - Servicing 3.25 REPLACEMENT OF DHW THERMISTOR 4. Fit the replacement thermistor and reassemble. Refer to Section 5. Re-establish 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 49: Diverter Valve Body Assembly Replacement
Section 3 - Servicing 3.27 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 3.32... -
Page 50: Pump Head Replacement
Section 3 - Servicing 3.28 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 51: Flow Thermistor Replacement
Section 3 - Servicing 3.30 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 7. -
Page 52: Heat Engine Replacement
Section 3 - Servicing 3.31 HEAT ENGINE REPLACEMENT 17. Reassemble, ensuring the heat exchanger is located Refer to Section 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 53: Expansion Vessel Recharging & Replacement
Section 3 - Servicing 3.32 EXPANSION VESSEL RECHARGING & REPLACEMENT Refer to Section RECHARGING 1. Remove the charge point cap. 2. Recharge the tank pressure to 0.75 bar. 3. Reassemble. REPLACEMENT 4. Drain the boiler CH circuit. Refer to Section 5. -
Page 54: Section 4 - Fault Finding
Section 4 - Fault Finding MAIN MENU, FAULT HELP Fault finding help can be accessed through the menu. Fault finding help lists all the common faults with the necessary checks. More detailed fault checks and actions are described in the following pages. Menu Fault Help Change Service Time... -
Page 55: Ignition Lockout
Section 4 - Fault Finding IGNITION LOCKOUT If the boiler is restarted does the Is the Gas Pressure available at Check gas supply and boiler ignite for a short time and the Boiler Inlet (>18 mbar)? rectify fault then extinguish? Check wiring connection Is approx 24 Vdc supply available at from gas valve to... -
Page 56: Flame Loss
Section 4 - Fault Finding FLAME LOSS Does the boiler ignite for a short Is the Gas Pressure available at Check gas supply and time and then extinguish? the Boiler Inlet (>18 mbar)? rectify fault Check wiring from Is 24V DC supply available at the Check the Ignition/ detection gas valve to PCB for Gas Valve while the flame is on? -
Page 57: Flow Thermistor Fault
Section 4 - Fault Finding FLOW THERMISTOR FAULT Securely connect the wiring to the Flow Is the wiring securely connected to the Flow Thermistor Thermistor located in the Flow Pipe lower LHS of Boiler? Disconnect the wiring from the Flow Thermistor Check the resistance using a suitable multimeter connected across the Thermistor’s terminal pins Fit a new Thermistor... -
Page 58: Outside Sensor Fault
Section 4 - Fault Finding 4.10 OUTSIDE SENSOR FAULT Securely connect the wiring at both the Is the wiring securely connected at both the boiler and boiler and Outside Sensor Outside Sensor? Disconnect the wires to the outside sensor. Check the resistance using a suitable multimeter connected across the Outside Sensor’s terminal pins Fit a new Outside Sensor Temperature... -
Page 59: No Dhw But Ch Works Ok
Section 4 - Fault Finding 4.12 NO DHW BUT CH WORKS OK Does tap symbol change from blue to Correct pipe work Are hot & cold pipe work crossed? orange when a tap is turned on? Re-connect wiring Is wiring connected between PCB &... -
Page 60: No Display
Section 4 - Fault Finding 4.13 NO DISPLAY Supply power to the boiler Is there 230 V AC to the boiler at L and N? Is the wiring from the terminal block to the PCB Connect the wiring from the terminal block to the connected securely? PCB securely Replace the PCB... -
Page 61: Section 5 - Spare Parts
Do not use reconditioned or copy parts that have not been clearly to spares authorised by Ideal Heating. Failure to do so could affect safety or performance of this appliance. Comprehensive spares parts information and details of approved Ideal Parts Distributors are available on idealparts.com... -
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. Carry Out Flue Integrity Check Using Analyser. Refer to Section In accordance with boiler instructions, set 2.31 on Insert analyser probe into air inlet test point (where page 33 boiler to operate at maximum rate (full load available) and allow readings to stabilise.
- Page 68 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.