Contents

Contents
1 Safety
- 1.1 Benchmark
  - 1.1.1 Building Regulations and the Benchmark Commissioning Checklist
  - 1.1.2 The Benchmark scheme
  - 1.1.3 Installer notification guidelines
- 1.2 General safety instructions
- 1.3 Recommendations
- 1.4 Specific safety instructions
  - 1.4.1 Handling
- 1.5 Liabilities
  - 1.5.1 Manufacturers liability
  - 1.5.2 Installers liability
  - 1.5.3 Users liability
2 About this manual
- 2.1 General
- 2.2 Additional documentation
- 2.3 Symbols used
  - 2.3.1 Symbols used in the manual
- 2.4 Abbreviations/glossary
3 Technical specifications
- 3.1 Homologations
  - 3.1.1 Safety, performance & quality
  - 3.1.2 Certifications
  - 3.1.3 Gas category
  - 3.1.4 Standards
- 3.2 Technical data
  - 3.2.1 Technical information
  - 3.2.1 Features of the temperature sensors
- 3.3 Dimensions and connections
4 Description of the product
- 4.1 General description
- 4.2 Operating principle
  - 4.2.1 Air-gas adjustment
  - 4.2.2 Combustion
  - 4.2.3 Heating and domestic hot water production
  - 4.2.4 Schematic diagram
- 4.3 MAIN COMPONENTS
- 4.4 Control panel description
  - 4.4.1 Description of the control panel
- 4.5 Contents of the package
- 4.6 Accessories & options
5 Before installation
- 5.1 Installation standards and rules
- 5.2 Installation requirements
  - 5.2.1 Gas supply
  - 5.2.2 Electrical supply
  - 5.2.3 Hard water area
  - 5.2.4 Bypass
  - 5.2.5 System control
  - 5.2.6 Treatment of water circulating systems
  - 5.2.7 Showers
  - 5.2.8 Expansion vessel (CH only)
  - 5.2.9 Safety pressure relief valve
- 5.3 Flow rate/head at the plate characteristics
- 5.4 Choice of the location
  - 5.4.1 Location of the boiler
  - 5.4.2 Bath and shower rooms
  - 5.4.3 Ventilation
  - 5.4.4 Condensate drain
  - 5.4.5 Clearances
  - 5.4.6 Flue/chimney location
  - 5.4.7 Horizontal flue/chimney systems
  - 5.4.8 Flue/chimney trim
  - 5.4.9 Terminal guard
  - 5.4.10 Flue/chimney deflector
  - 5.4.11 Flue/chimney accessories
  - 5.4.12 Data plate and boiler service label
- 5.5 Transport
- 5.6 Unpacking & initial preparation
  - 5.6.1 Unpacking
  - 5.6.2 Initial preparation
- 5.7 Connecting diagrams
  - 5.7.1 Filling information
  - 5.7.2 Domestic hot water circuit
6 Installation
- 6.1 General
- 6.2 Assembly
  - 6.2.1 Fitting the pressure relief discharge pipe
  - 6.2.2 Connecting the condensate drain
- 6.3 Air supply/flue gas connections
  - 6.3.1 Connecting the flue/chimney
- 6.4 Electrical connections
  - 6.4.1 Accessing the electrical connections
  - 6.4.2 Connecting the room thermostat
  - 6.4.3 Service connection (SERVICE)
  - 6.4.4 Connecting on wall outdoor sensor
  - 6.4.5 Connecting the outside sensor
  - 6.4.6 Identifying label
- 6.5 Filling the installation
  - 6.5.1 Flushing the system
  - 6.5.2 Fill the installation
  - 6.5.3 Filling the condensate trap
- 6.6 Draining the installation
7 Commissioning
- 7.1 General
- 7.2 Checklist before commissioning
- 7.3 Commissioning procedure
- 7.4 Gas settings
  - 7.4.1 Check the operational (working gas inlet pressure and gas rate)
  - 7.4.2 Combustion parameters
  - 7.4.3 Service settings
  - 7.4.4 Calibrating the gas valve
- 7.5 Final instructions
  - 7.5.1 Handover
8 Operation
- 8.1 Use of the control panel
  - 8.1.1 Browsing the menus
  - 8.1.2 Running the automatic detection function
  - 8.1.3 Information menu display
  - 8.1.4 Counter menu display
- 8.2 Start-up
  - 8.2.1 Procedure for first start-up
  - 8.2.2 Changing the heating flow temperature
  - 8.3.3 Changing the domestic hot water (DHW) temperature
- 8.3 Shutdown
  - 8.3.1 Switching off the heating and domestic hot water (DHW)
- 8.4 Degassing function
- 8.5 Frost protection
9 Settings
- 9.1 Accessing the settings
- 9.2 Listing of parameters
  - 9.2.1 Resetting factory settings
- 9.3 Setting the parameters
  - 9.3.1 Setting the heating curve
- 9.4 Reading out measured values
  - 9.4.1 Statuses and sub-statuses
- 9.5 Reading meters
10 Maintenance
- 10.1 General
- 10.2 Maintenance message
  - 10.2.1 Service notification
  - 10.2.2 Resetting the displayed maintenance message
  - 10.2.3 Resetting the upcoming maintenance message
- 10.3 Standard inspection and maintenance operations
  - 10.3.1 Annual Servicing
  - 10.3.2 Checking the water pressure
  - 10.3.3 Checking the expansion vessel
  - 10.3.4 Checking the flue gas discharge and the air supply
  - 10.3.5 Checking the combustion
  - 10.3.6 Checking the automatic air vent
  - 10.3.7 Cleaning the siphon
  - 10.3.8 Checking the burner and cleaning the heat exchanger
  - 10.3.9 Electrode distances
  - 10.3.10 Water unit
  - 10.3.11 Removing limescale
- 10.4 Specific maintenance operations
  - 10.4.1 Detection/ignition electrode replacement
  - 10.4.2 Dismantling the water-water exchanger
  - 10.4.3 Replacing the 3-way valve
  - 10.4.4 Pump - replacement
  - 10.4.5 Replacing the expansion vessel
  - 10.4.6 Replacing the PCB
11 Troubleshooting
- 11.1 Temporary and permanent faults
- 11.2 Error codes
12 Decommissioning
- 12.1 Disassembly
- 12.2 Recommissioning
13 Disposal
- 13.1 Disposal and recycling

Baxi 224 Combi 2 Installation and Service Manual

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Baxi 224 Combi 2 Specification

The Baxi 224 Combi 2 is a compact and efficient combination boiler designed for residential heating and hot water needs. It features a 24 kW output, making it suitable for small to medium-sized homes. The boiler is equipped with a high-efficiency heat exchanger that maximizes energy use, helping to reduce utility bills and environmental impact. The Baxi 224 Combi 2 operates on natural gas and has an ERP A-rating, ensuring compliance with modern energy efficiency standards.

The boiler boasts a user-friendly interface with a digital display, allowing homeowners to easily adjust settings and monitor performance. It includes a range of safety features such as frost protection and a pressure relief valve, enhancing reliability and peace of mind. The compact dimensions of the Baxi 224 Combi 2 facilitate easy installation in tight spaces, such as kitchen cupboards, without compromising on performance.

This model supports rapid hot water delivery with a flow rate of up to 9.8 liters per minute, ensuring a consistent supply for showers and taps. The Baxi 224 Combi 2 is also compatible with smart controls, enabling remote operation and integration with modern home automation systems. Its quiet operation ensures minimal disruption in living spaces. Overall, the Baxi 224 Combi 2 is designed to offer a balance of performance, efficiency, and convenience, making it an ideal choice for homeowners seeking reliable heating and hot water solutions.

Baxi 224 Combi 2 F.A.Q.

How do I reset the Baxi 224 Combi 2 boiler?

To reset the Baxi 224 Combi 2 boiler, locate the reset button on the control panel. Press and hold the button for approximately 5 seconds until the boiler restarts. If the issue persists, consult the user manual or contact a professional technician.

What should I do if my Baxi 224 Combi 2 is not igniting?

If the boiler is not igniting, check that the gas supply is on and the water pressure is adequate. Ensure there are no error codes displayed. If the problem continues, reset the boiler. If issues persist, contact a qualified engineer.

How can I increase the water pressure in my Baxi 224 Combi 2?

To increase the water pressure, open the filling loop valves and allow water to enter the system until the pressure gauge reaches the recommended level (usually between 1.0 and 2.0 bar). Close the valves once the desired pressure is achieved.

What maintenance should be performed on the Baxi 224 Combi 2 boiler?

Regular maintenance should include checking the pressure, bleeding radiators, cleaning the condensate trap, and ensuring ventilation is unobstructed. It is recommended to have the boiler serviced annually by a qualified technician.

Why is my Baxi 224 Combi 2 making a loud noise?

A loud noise could be due to air in the system, low water pressure, or a failing part such as the pump. Bleed the radiators to remove air and check the pressure gauge. If the noise persists, seek professional assistance.

How do I bleed a radiator with the Baxi 224 Combi 2 system?

To bleed a radiator, turn off the heating system and allow it to cool. Use a radiator key to open the bleed valve. Let the air escape until water starts to flow, then close the valve. Check and adjust the boiler pressure if necessary.

What is the correct way to set the temperature on a Baxi 224 Combi 2?

Use the control panel to adjust the heating and hot water temperature settings. For heating, set the desired temperature using the heating dial. For hot water, adjust the hot water dial to your preferred setting.

Why is my Baxi 224 Combi 2 showing a pressure error?

A pressure error may indicate that the system pressure is too low or too high. Check the pressure gauge and adjust using the filling loop if necessary. If the error continues, there may be a leak or faulty component.

How can I prevent my Baxi 224 Combi 2 from freezing in winter?

To prevent freezing, ensure the condensate pipe is insulated and the boiler is set to run in cold weather mode. Regularly check that the heating system is operational during cold spells.

What should I do if the Baxi 224 Combi 2 displays an error code?

Consult the user manual for the specific error code meaning. Some errors can be resolved by resetting the boiler, while others may require professional intervention. If unsure, contact a certified technician.