1. Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Remeha Calenta Ace 25L 25KW Gas Condensing Combi Wall-Mounted Boiler. Please read this manual thoroughly before attempting any installation, operation, or maintenance procedures. Keep this manual in a safe place for future reference.
2. Safety Information
Important Safety Instructions:
- Installation, maintenance, and repair must only be carried out by a qualified and certified professional in accordance with local and national regulations.
- Do not attempt to modify the appliance or its components. Unauthorized modifications can lead to dangerous situations and void the warranty.
- Ensure adequate ventilation in the room where the boiler is installed.
- In case of a gas leak, immediately shut off the gas supply, open windows and doors, and contact a qualified technician. Do not operate electrical switches.
- Keep flammable materials away from the boiler.
- Always disconnect the power supply before performing any maintenance or service.
Failure to follow these instructions could result in property damage, personal injury, or death.
3. Product Overview
The Remeha Calenta Ace 25L 25KW is a high-efficiency gas condensing combi boiler designed for both central heating and domestic hot water production. Its compact design allows for wall-mounted installation, making it suitable for various residential applications.
Figure 3.1: Front view of the Remeha Calenta Ace boiler with the cover closed. This image shows the sleek, white casing of the unit, indicating its compact and modern design suitable for indoor installation.
Figure 3.2: Front view of the Remeha Calenta Ace boiler with the lower panel open, revealing the integrated control panel. The control panel features a digital display and buttons for adjusting settings and monitoring the boiler's status.
4. Setup and Installation
Note: Installation must be performed by a qualified heating engineer.
4.1 Unpacking and Inspection
Carefully unpack the boiler and inspect it for any signs of damage. Report any damage to your supplier immediately.
4.2 Mounting the Boiler
The boiler is designed for wall-mounted installation. Ensure the wall is structurally sound to support the weight of the boiler when filled with water. Use the provided mounting bracket.
Figure 4.1: The Remeha Calenta Ace boiler shown with its wall mounting bracket and a flexible gas connection pipe. This illustrates the components required for securing the boiler to a wall and connecting it to the gas supply.
4.3 Connecting Water and Gas Supplies
Connect the central heating flow and return pipes, domestic hot water pipes, and the gas supply pipe according to the installation diagram. Ensure all connections are sealed properly to prevent leaks.
Figure 4.2: Rear view of the Remeha Calenta Ace boiler, highlighting the various connection points for water and gas. Visible connections include inlets and outlets for central heating, domestic hot water, and the gas supply, color-coded for identification.
4.4 Electrical Connections
Connect the boiler to the main electrical supply. Ensure proper grounding and follow all electrical safety standards.
4.5 Flue System Installation
Install the flue system according to the manufacturer's instructions and local regulations to ensure safe and efficient exhaust of combustion products.
5. Operating Instructions
5.1 Initial Start-up
- Ensure all water and gas connections are secure and leak-free.
- Open the gas supply valve.
- Fill the central heating system with water and vent any air from the system.
- Switch on the electrical supply to the boiler.
- Follow the on-screen prompts on the control panel for initial setup and configuration.
5.2 Control Panel Functions
The control panel allows you to adjust settings such as desired heating temperature, domestic hot water temperature, and operating modes. Refer to the display for current status and error codes.
5.3 Heating Operation
Set the desired room temperature on your thermostat or the boiler's control panel. The boiler will modulate its output to maintain the set temperature efficiently.
5.4 Domestic Hot Water Operation
When a hot water tap is opened, the boiler will automatically switch to domestic hot water mode, providing hot water on demand.
6. Maintenance
Regular maintenance is crucial for the safe, efficient, and long-lasting operation of your Remeha Calenta Ace boiler. Only qualified service personnel should perform maintenance.
6.1 Annual Service
It is recommended to have your boiler serviced annually by a qualified technician. This includes checking combustion efficiency, cleaning components, inspecting for leaks, and verifying safety devices.
Figure 6.1: Internal view of the Remeha Calenta Ace boiler with the casing removed, exposing the heat exchanger, pump, expansion vessel, and other critical components. This view is typically accessed by qualified technicians during maintenance and servicing.
6.2 User Checks
- Pressure Gauge: Regularly check the system pressure on the boiler's gauge. It should typically be between 1.0 and 1.5 bar when the system is cold.
- Ventilation: Ensure that air vents are not obstructed.
- Visual Inspection: Periodically check for any visible signs of leaks or unusual noises.
7. Troubleshooting
This section provides solutions for common issues. For complex problems or if you are unsure, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| No heating or hot water | Low system pressure | Re-pressurize the system (refer to installation manual or contact technician). |
| Boiler displays an error code | Specific fault detected | Note the error code and consult the full technical manual or contact a service technician. |
| Radiators are cold at the top | Air in the system | Bleed the radiators to release trapped air. |
| Unusual noises from boiler | Air in system, pump issue, or other component fault | Check system pressure, bleed air. If noise persists, contact a qualified technician. |
8. Specifications
Technical data for the Remeha Calenta Ace 25L 25KW boiler:
- Model: Calenta Ace 25L 25KW
- Type: Gas Condensing Combi Wall-Mounted Boiler
- Heating Output: 25 KW
- Domestic Hot Water Output: 25 KW (L for domestic hot water capacity)
- Manufacturer: Remeha
- Article Number: 7689085
- Energy Efficiency Class (Heating): A
- Energy Efficiency Class (DHW): A (XXL profile)
Figure 8.1: The energy label for the Remeha Calenta Ace 25L boiler, indicating its energy efficiency ratings for both space heating (Class A) and domestic hot water production (Class A with XXL load profile).
9. Warranty and Support
For detailed warranty information, please refer to the warranty card supplied with your boiler or contact your installer/supplier. Remeha products typically come with a manufacturer's warranty covering defects in materials and workmanship.
In case of technical issues or for professional support, please contact your certified Remeha installer or a qualified heating technician. Ensure you have your boiler's model number (Calenta Ace 25L 25KW) and article number (7689085) available when seeking support.
For general inquiries or to find a local service partner, visit the official Remeha website.
