The Main Combi 24 HE is a fully automatic, gas-fired, wall-mounted condensing combination boiler, designed to provide efficient central heating and mains-fed domestic hot water solutions.
1.1 Overview of the Boiler’s Features and Benefits
The Main Combi 24 HE offers a compact, energy-efficient solution for central heating and domestic hot water. Its wall-mounted design saves space, while the condensing technology ensures high efficiency and reduced emissions. The boiler operates on Natural Gas (G20) and can be converted to Propane or Butane, offering flexibility. With a maximum output of 24.0 kW, it meets the needs of medium-sized homes. Its room-sealed, fan-assisted design enhances safety and performance. The system includes user-friendly controls and is compatible with various installation configurations, making it a reliable choice for modern heating needs.
1.2 Key Components and Technical Specifications
The Main Combi 24 HE features a secondary heat exchanger for efficient heat transfer and is compatible with Natural Gas, Propane, and Butane. Its compact design includes a 28mm condensate drain and various connections (22mm and 15mm). The boiler has a maximum output of 24.0 kW and operates with a fully automatic, fan-assisted system. Key components include the On/Off/Reset selector switch, central heating and hot water temperature controls, and a fault indicator neon. Technical data covers pump head, burner injectors, and gas pressure rates, ensuring compliance with the Benchmark Commissioning Checklist and Water Byelaws.
Technical Specifications of the Main Combi 24 HE
Maximum output of 24.0 kW, high efficiency, compatible with Natural Gas (G20), Propane, and Butane. Compact dimensions and lightweight design facilitate easy installation and energy savings.
2.1 Maximum Output and Efficiency Ratings
The Main Combi 24 HE boiler delivers a maximum output of 24.0 kW, ensuring efficient heating and hot water supply. With its high-efficiency design, it achieves an ErP A-rating for both heating and water production. The boiler incorporates advanced condensing technology, capturing heat from flue gases to maximize energy savings. Its efficient operation reduces fuel consumption and lowers carbon emissions, making it an eco-friendly choice. The boiler’s performance is optimized through a secondary heat exchanger and fan-assisted combustion, ensuring reliable and consistent energy output. This model is designed to meet modern energy efficiency standards while providing cost-effective heating solutions.
2.2 Compatible Fuel Types and Conversion Options
The Main Combi 24 HE is designed to operate on Natural Gas (G20) as its primary fuel source. It also offers flexibility with conversion options for use with Propane (G31) or Butane gases, making it adaptable to various installation scenarios. A conversion kit is required for LPG operation, and the process must be carried out by a qualified technician following the manufacturer’s instructions. This versatility ensures the boiler can be installed in locations where different fuel types are available, maintaining its high performance and efficiency across all configurations.
2.3 Dimensions and Weight for Installation Planning
The Main Combi 24 HE boiler has compact dimensions, making it ideal for wall-mounted installation in various spaces. It measures approximately 700mm in height, 400mm in width, and 300mm in depth, ensuring it fits neatly in standard kitchen or utility areas. The boiler weighs around 40kg, facilitating easy handling during installation. Adequate clearance is required for safe operation, typically 50mm at the top, 100mm at the front, and 25mm on the sides. These dimensions ensure efficient installation while maintaining performance and safety standards.
System Requirements and Pre-Installation Checks
The Main Combi 24 HE requires specific water hardness treatment and adequate space for installation. Ensure proper electrical and gas supply connections, and conduct system checks before installation.
3.1 Water Hardness and Treatment Recommendations
The Main Combi 24 HE requires water hardness consideration to ensure optimal performance. In hard water areas, a suitable treatment device must be installed to prevent scaling. This protects the boiler’s internal components and maintains efficiency. The manual recommends consulting the water supply company for appropriate solutions. Failure to address water hardness can lead to reduced system lifespan and increased maintenance needs. Always adhere to the manufacturer’s guidelines for water treatment to comply with installation standards and warranty conditions. Proper treatment ensures reliable operation and extends the boiler’s longevity.
3.2 Space and Clearance Requirements for Safe Installation
The Main Combi 24 HE boiler requires specific space and clearance for safe and efficient installation. Ensure the boiler is installed in a well-ventilated area, maintaining minimum clearances of 100mm at the top, 50mm at the sides, and 150mm at the front for proper servicing. The boiler must be wall-mounted at a height that allows easy access for maintenance. Additionally, the flue system must be installed with adequate clearance from windows, doors, and neighboring properties to comply with safety regulations and avoid plume issues. Proper spacing ensures safe operation and maintains warranty validity.
3.3 Electrical and Gas Supply Connections
The Main Combi 24 HE requires a 230V, 50Hz electrical supply with a fused double-pole isolator, ensuring a 3mm contact separation. The gas supply must be connected via a service cock, with a minimum operating pressure of 1.0 bar. Electrical connections should only power the boiler and its controls, while gas connections must comply with local safety standards. Ensure all connections are secure and leak-tested before commissioning. Proper setup ensures safe and efficient boiler operation, adhering to installation regulations and manufacturer guidelines.
Installation Process for the Main Combi 24 HE
The installation involves site preparation, boiler positioning, and connecting gas, water, and electrical supplies. Ensure all connections are secure and comply with safety standards.
4.1 Site Preparation and Boiler Positioning
Before installation, ensure the site is prepared by clearing the area and ensuring a level surface. Check for water hardness and treat if necessary to prevent scaling. Verify electrical and gas supply connections are within reach and meet specifications. Position the boiler on a suitable wall, ensuring adequate clearance for maintenance and proper ventilation. Follow manufacturer guidelines for optimal placement, avoiding confined spaces and ensuring easy access for future servicing. Proper positioning ensures efficient operation and compliance with safety standards.
4.2 Pipe Connections and Hydraulic Setup
Connect the necessary pipes to the boiler’s ports, ensuring correct flow and return connections for heating and domestic hot water. Verify all pipe sizes match specifications (e.g., 22mm for heating and 15mm for water). Securely attach the condensate drain to a suitable discharge point, following local regulations. Check for leaks after connections are made. Ensure hydraulic components, like the pump and valves, are correctly configured for optimal water flow. Proper setup ensures efficient system performance and prevents future issues.
4.3 Flue Installation and Configuration
Install the flue system using approved components, ensuring compliance with local regulations; Horizontal flues require a 1.5mm fall per metre to prevent condensate buildup. Vertical flues must be fitted with the correct terminal and adaptors. Connect the flue to the boiler’s outlet, securing all joints tightly. Ensure the flue termination is at least 1 metre above the ground and 0.5 metres from any window or door. Use a flue deflector if necessary to redirect plumes. Always follow the manufacturer’s guidelines for flue configuration and safety standards.
4.4 Initial Firing and System Pressure Check
After completing the installation, turn on the electrical supply and ensure the gas supply is connected properly. Press the reset button to initiate the boiler’s start-up sequence. Observe the ignition process and check for any unusual noises or leaks. Verify the system pressure using the pressure gauge, ensuring it is set between 1 and 2 bar. If the pressure is incorrect, adjust it according to the manufacturer’s instructions. Once the boiler fires up successfully, check for any leaks in the pipe connections and ensure all safety devices are functioning correctly.
Commissioning the Boiler
Commissioning involves powering on the boiler, checking system operation, and ensuring all controls are set correctly. This step confirms proper installation and functionality.
5.1 Powering On and Initial System Test
Powering on the Main Combi 24 HE involves switching the selector to the desired mode (CH or DHW) and checking the neon indicators for power and flame status. The initial system test ensures all components function correctly, including the burner, pump, and temperature controls. This step verifies proper installation, checks for leaks, and confirms that the boiler operates within safe parameters. Any issues detected during this phase should be addressed before proceeding to full commissioning.
5.2 Adjusting Controls for Optimal Performance
Adjusting the controls on the Main Combi 24 HE ensures the boiler operates efficiently and meets the household’s heating and hot water needs. The central heating temperature control and hot water temperature control can be set to desired levels. Additionally, the DHW flow rate can be adjusted to optimize performance. It is essential to follow the manufacturer’s guidelines to avoid overheating or insufficient heating. Proper adjustment ensures energy efficiency, comfort, and system longevity. Always refer to the manual for specific adjustment procedures.
5.3 Completing the Benchmark Commissioning Checklist
The Benchmark Commissioning Checklist ensures the Main Combi 24 HE is installed and configured correctly. This process involves verifying system pressure, checking temperature settings, and confirming flue installation compliance. The checklist must be completed by a qualified installer and left with the user for future reference. It includes checks for gas safety, water treatment, and electrical connections. Proper completion ensures the boiler operates efficiently and complies with Building Regulations. The checklist is a critical step in the commissioning process and must be signed and dated by the installer.
Maintenance and Servicing Guidelines
Regular maintenance ensures optimal performance and longevity of the Main Combi 24 HE boiler. Schedule annual servicing by a qualified technician to inspect components, clean filters, and check for leaks.
6.1 Daily and Weekly Checks for Optimal Function
Daily checks involve monitoring the boiler’s pressure gauge to ensure it remains within the recommended range (1-2 bar). Visually inspect the system for leaks, and ensure all valves are fully open. Weekly, check the flue terminal for blockages and clean it if necessary. Inspect the condensate drain for proper flow and ensure it’s not frozen or kinked. Regularly clean or replace the system filters to maintain efficiency. For hard water areas, consider installing a water treatment device to prevent scaling. Always refer to the manual for detailed guidance.
6.2 Annual Servicing Requirements
Annual servicing is essential to maintain the Main Combi 24 HE boiler’s efficiency and safety. A qualified Gas Safe engineer should inspect and clean the heat exchanger, burner, and flue, ensuring no blockages or damage. The combustion chamber and fan should be checked for wear. Additionally, the system’s water treatment should be verified, and the pressure relief valve tested. Electrical connections and gas supply lines must be inspected for leaks or damage. Any worn or faulty components, such as seals or filters, should be replaced. This service ensures optimal performance and compliance with safety standards.
6.3 Fault Finding and Diagnostic Techniques
The Main Combi 24 HE boiler features a fault indicator neon to help identify issues. Common faults include ignition failures, sensor malfunctions, or system pressure drops. Engineers should start by checking error codes and consulting the manual. Visual inspections of components like the heat exchanger, burner, and flue are essential. Testing gas supply, water flow, and electrical connections is recommended. If issues persist, advanced diagnostic tools may be required to pinpoint problems. Regular servicing can prevent many faults, ensuring reliable boiler operation. Always follow safety guidelines during diagnostics.
User Manual and Operating Instructions
The manual includes detailed instructions for operating the boiler, troubleshooting, and repressurizing the system. It also provides warranty information and service contact details.
7.1 Understanding the Boiler Controls and Interface
The Main Combi 24 HE features an intuitive control interface with an LCD display, providing clear operational feedback. The boiler includes a temperature control for both central heating and domestic hot water, allowing precise adjustment. The selector switch enables easy toggling between heating modes, while diagnostic LEDs indicate system status and potential faults. Detailed diagrams and explanations in the manual ensure users can navigate the controls confidently. This section helps homeowners and installers understand and utilize the boiler’s interface effectively for optimal performance.
7.2 Repressurizing the System and Troubleshooting
Repressurizing the Main Combi 24 HE is essential to maintain optimal performance. The process involves using the filling loop to restore system pressure to 1-1.5 bar. If the pressure drops, the boiler will not function correctly. Troubleshooting is simplified with fault codes displayed on the LCD screen, indicating issues like ignition failures or low pressure. The manual provides step-by-step guidance for resolving common faults, ensuring quick and effective solutions. Regular checks and maintenance can prevent many issues, ensuring reliable operation.
7.3 Warranty Information and Service Contacts
The Main Combi 24 HE boiler comes with a comprehensive warranty, ensuring coverage for parts and labor under specified terms. Proper registration is required to activate the warranty. For service inquiries or repairs, users can contact Baxi’s customer support team directly. The manual provides detailed contact information and guidelines for warranty claims. Keeping the installation and servicing manual handy ensures easy access to support resources, ensuring prompt assistance when needed. Regular maintenance helps maintain warranty validity and optimal boiler performance.