Open Chamber Boiler Euroterm MAIA PLUS D 24 J Manual – Complete Guide
The MAIA PLUS D 24 J boiler produced by Euroterm is a rapid instantaneous boiler.
This boiler is well suited to small/medium-sized apartments and is currently installed and functioning in various homes.
The device is a type B and requires a ventilation and aeration hole in the room where it is installed. This device cannot be installed in Bedrooms or Bathrooms.
Annual Maintenance
Annual checks are crucial to ensure optimal boiler performance, maintaining efficiency, safety, and reliability. These annual checks are fundamental to ensure the safety and ongoing effectiveness of the device.
Essential Tips for Your Boiler in Winter
- Pressure Monitoring: Check your Euroterm MAIA PLUS D 24 J boiler’s pressure gauge to ensure correct pressure.
- Thermostat Batteries: Replace the batteries of the room thermostat to ensure maximum efficiency.
- Heating Pressure Check: Keep the heating system pressure between 1 and 1.5 bar for effective heating.
- Qualified Assistance: Entrust the maintenance and cleaning of your Euroterm MAIA PLUS D 24 J boiler to expert technicians.
Managing Pressure in the Heating System
Checking the heating system’s pressure every quarter is crucial to ensure it remains between 1bar and 2bar. This check is also fundamental in summer, as the radiator water is used for sanitary water heating. If the pressure drops too low, the boiler may cease to operate.
To adjust the pressure, locate the filling tap under the appliance, usually green, open it until the pressure gauge reaches 1.5bar, then close it.
Optimal Temperature Settings for the Boiler
The Euroterm MAIA PLUS D 24 J boiler offers flexibility in adjusting temperatures for domestic heating and hot water. Use the control panel to find the ideal temperature, keeping in mind the importance of setting the DHW to the minimum necessary to reduce the risk of calcification.
Tips for Adjusting Temperatures:
- Radiator Temperature: The adjustment refers to the radiator temperature, not the ambient temperature.
- DHW Temperature: Keep the domestic hot water temperature as low as possible to prevent calcification in the secondary heat exchanger.
DIY: Replacement of Shower Filters and Heads
Discover how to easily replace the aerator filters and shower heads in your shower to prevent limescale buildup. This simple maintenance can avoid overheating problems and difficulties in removing filters, ensuring the proper functioning of the Euroterm MAIA PLUS D 24 J boiler.
Preparing Your Boiler for the Holidays
Before leaving for the holidays, it’s essential to take precautions to ensure the safety and efficiency of your Euroterm MAIA PLUS D 24 J boiler. Even the latest models are not immune to possible leaks.
Here are some recommended measures:
- Close the domestic hot water supply valve to prevent possible water leaks.
- Shut off the gas supply to prevent safety issues.
- Turn off the heat generator to reduce energy consumption and increase safety.
Upon your return, restore all these settings in the reverse order. You will likely need to rearm the heat generator to resolve any ignition errors caused by the shutdown.
These simple actions will allow you to enjoy your holidays with greater peace of mind, knowing that your home and boiler are safe.
Maintenance Tips
Regular maintenance of the MAIA PLUS D 24 J boiler is crucial to preserve its efficiency and safety. It is strongly advised against for inexperienced users to attempt any technical intervention on the boiler. Any doubts or anomalies in operation must be immediately reported to an expert technician. Annual maintenance, carried out by qualified technicians, is fundamental for the correct operation of the appliance.
Warnings for the Use of Electric Energy
For safe use of the boiler, it is important to follow some basic rules:
- Do not touch the appliance with wet or damp body parts and avoid doing so barefoot.
- Avoid pulling electrical cords and ensure they are not damaged.
- Do not expose the appliance to adverse weather conditions such as rain or direct sunlight, unless otherwise indicated.
- In case of damage to the electric cord, immediately turn off the appliance and contact a qualified technician for replacement.
Additionally, ensure that the boiler is installed, put into operation, and maintained by authorized technicians to guarantee the validity of the warranty and safety in use. Improper use of the appliance and any unauthorized alterations could pose safety risks.
What to Do in the Presence of Gas Odor
In situations of potential gas leakage, it is crucial to follow these guidelines:
- Avoid using any electrical device that could trigger sparks, including the phone.
- Immediately ventilate the environment by opening doors and windows.
- Close the gas taps to stop the leakage.
- Promptly call for urgent intervention by expert and qualified personnel.
The boiler should be used exclusively according to the manufacturer’s instructions and for heating water to safe temperatures. Improper use can cause serious damage. Ensure that installation and maintenance are entrusted to authorized technicians to avoid risks and ensure compliance with safety regulations.
Index of Components and Spare Parts
Use this section as an index to navigate through the different components and spare parts of the MAIA PLUS D 24 J boiler. You will find clear descriptions and practical advice for each part, which will help you manage the maintenance of your appliance in the best possible way.
Features of the MAIA PLUS D 24 J Boiler Display
Discover the features and symbols of the MAIA PLUS D 24 J boiler display, a panel rich in information. Key commands:
- PLUS and MINUS Thermo: Adjust the radiator temperature, independent of the ambient temperature.
- ECO/COMFORT: Choose between ECO/COMFORT1/COMFORT2 settings for sanitary water.
- RESET: Solves errors (excluding water shortage) and allows menu access.
- SUN/SNOWFLAKE: Switch for Summer and Winter seasons.
Display indicators:
- SUN/SNOWFLAKE: Indicates the seasonal mode of the boiler.
- ECO/COMFORT: Active mode for sanitary water.
- 1.2 bar: Real-time pressure level of the boiler.
- Drop Symbol: Represents the flame’s power, increases with flame intensity.
- Upper Temperature: Shows the temperature of the primary circuit, important also in summer for DHW.
- Lower Temperature: Current temperature of sanitary water.
Domestic Hot Water Production Modes in the Boiler
The production of domestic hot water (DHW) is enhanced with the introduction of micro-accumulation and the new COMFORT mode, selectable from the boiler’s control panel. There are various modes: ECO, COMFORT1, and COMFORT2.
ECO Mode
In ECO mode, the boiler produces DHW only on demand. Upon opening a tap, the boiler starts the ignition cycle. The flow meter adjusts the burner flame based on the water flow, allowing accurate control of DHW temperature. However, this mode may slow down the delivery of hot water due to micro-accumulation.
COMFORT Mode
The COMFORT mode, in its two variants, involves preheating of DHW. COMFORT1 allows the user to adjust the temperature using the plus and minus buttons. COMFORT2, on the other hand, maintains a constant temperature of 45 degrees.
Temperature Adjustment
On the control panel of the Euroterm MAIA PLUS D 24 J condensing boiler, you can find all the operational information. You can set the temperatures for heating or hot water by pressing the + and – buttons next to their respective symbols: Faucet and Radiator. After pressing, the boiler displays the set temperature for only a few seconds.
Normally, the boiler shows the flow temperature, to be interpreted as the internal temperature of the boiler. As a result, you will see the temperature rise even in summer when the Euroterm MAIA PLUS D 24 J boiler produces hot water, while in winter it can be interpreted as the current temperature of the radiators.
Using the + and – buttons at the top for heating and at the bottom for domestic hot water, you can choose the desired temperatures for heating. We suggest:
- From 25°C to 38°C if you have underfloor heating.
- From 55°C to 65°C if you have radiators made of aluminum or steel.
- From 45°C to 60°C if you have cast iron radiators.
For domestic hot water, you can choose the temperature using the + and – buttons at the bottom. We suggest a temperature between 38 and 45°C.
The general advice for the temperature of domestic hot water is to keep it as low as possible, especially if your water supply provides very hard water (over 30°F).
Error Guide
- Error A01: If the flame locks, especially after changing the gas meter, press the Reset button for a reset. If it does not resolve, it is necessary to call support.
- Error F37: Check the pressure via the pressure gauge. If it is below 0.8 bar, there is a lack of water. To correct, increase the pressure at the filling tap to 1.5 bar. FH will appear on the display as confirmation of the reset.
- FH: This wording is shown when the boiler begins the expulsion of air from the technical water, a process that normally takes two minutes after adjusting the pressure.
Optimization of the Primary Heat Exchanger
The copper primary heat exchanger for the Euroterm MAIA PLUS D 24 J boiler is crucial in maintaining high thermal efficiency, offering a vast heat exchange area.
A fundamental component is the overtemperature sensor, which prevents overheating and related problems within the exchanger.
Blockages in the water paths can cause malfunctions and noise; to avoid this, we recommend the installation of a Magnetic Filter, which protects the exchanger by keeping it free from debris and ensuring efficient and safe operation.
Adaptability of the Anti-Refoulaire Flue Cap
The anti-refoulaire flue cap for the Euroterm MAIA PLUS D 24 J boiler is a key element in the exhaust system, designed to fit perfectly with each specific boiler model.
Precisely assembled, its components made of sheet metal and rivets may require maintenance to prevent wear. In some cases, the use of screws for greater durability can be considered.
Attention: not all flue caps are interchangeable between different models. It is also important to monitor condensation, which can indicate drafting problems. Constant maintenance is fundamental to preserve the efficiency and safety of your Euroterm MAIA PLUS D 24 J boiler.
Grundfos UPS15/60 Boiler Circulator
The Grundfos UPS15/60 circulator is an optimal solution for water circulation in MAIA PLUS D 24 J boilers, ensuring efficiency and reliability. This model has three selectable speeds, with the highest speed recommended to maximize efficiency, unless there are noise disturbances from the circulating water.
Replacing this pump is usually a simple process for a qualified technician, although the stator can sometimes become stuck in the cast iron head after years of service, requiring special attention during removal.
Technical details of the UPS15/60 model:
- Capacity: 2.5 μF 230V – 50Hz IP44 TF 95
- Maximum Speed (III): 0.38 A – 85 W
- Medium Speed (II): 0.30 A – 65 W
- Low Speed (I): 0.21 A – 45 W
The UPS15/60 model is compatible for replacing various Grundfos motors, including UPS 15-50, 15-60, 25-50, 25-60, 15-65, 25-65.
Automatic Plastic Air Purger
The plastic automatic air purger, used as an insert in the purging housing in the pump manifold, is a key component in the Euroterm MAIA PLUS D 24 J boiler. This small element plays a vital role in ensuring the efficiency of the heating system by eliminating air from the system.
Made of durable plastic, this air purger is designed to easily fit into the dedicated housing in the pump manifold. Its use is particularly recommended to prevent air accumulation in the boiler’s hydraulic circuitry, especially in systems with a lot of aluminum where this problem is more frequent after periods of inactivity (summer).
Regularly checking and replacing the air purger and the system pressure is essential for maintaining uninterrupted operation at the start of the heating season. Its functionality is crucial for the proper operation of the entire domestic heating system.
Safety Systems according to the ErP Directive
The construction and installation of boilers in Europe are strictly regulated by a series of European standards, aimed at ensuring safety, energy efficiency, and reduction of environmental impact.
One of the main reference regulations is the ErP (Energy-related Products) Directive, which imposes stringent requirements in terms of energy efficiency and emissions for all energy-related products, including boilers. This directive is accompanied by specific UNI EN standards for each type of boiler, detailing the technical and safety standards to be respected.
The MAIA PLUS D 24 J boiler therefore includes:
The Safety Thermostat, located on the heating supply, intervenes by blocking the gas flow to the burner in case of overheating of the water in the primary circuit. It is essential to never deactivate this safety device.
The Flame Ionization Detector ensures safety by shutting down the boiler in case of gas absence or incomplete ignition of the main burner.
The Antifreeze Device activates the burner to maintain the water temperature above 5 °C, preventing freezing of the system.
The Hydraulic Safety Valve, set at 3 bar, protects the heating circuit. It is advisable to connect it to a siphoned drain and not use it to empty the circuit.
Anti-Legionella Treatment in MAIA PLUS D 24 J Boiler
The mandatory anti-Legionella treatment in the MAIA PLUS D 24 J boiler is crucial for ensuring the sanitary safety of water and preventing the formation of Legionella bacteria. This system, which automatically initiates a sterilization cycle according to the electronic board’s programming, is essential for the health and safety of the user. Deactivating this mechanism is strongly discouraged as it could lead to significant health risks due to the potential proliferation of Legionella bacteria in the water storage.
Possible Improvement Works
The Euroterm MAIA PLUS D 24 J boiler requires special attention to the flue pipes. It is essential to have a qualified technician ensure that the pipes are in optimal condition and comply with regulations.
Suitable Flue Pipes
The flue pipes for the Euroterm MAIA PLUS D 24 J boiler must comply with safety standards and be equipped with adequate seals to ensure efficiency and safety.
Recent stainless steel pipes with seals are the recommended option. In contrast, corrugated aluminum pipes or white enamel pipes without seals are not up to standard. It is essential to regularly check the quality and condition of the flue pipes.
For further information and specific advice, it is recommended to consult a qualified technician and adhere to current regulations.
Integrating a Gas Tap with a Test Well
Not always does the meter provide a connection for instrumental tightness testing. A useful tip is to replace the gas tap under the boiler with a valve with a well equipped with an instrumental take-off, essential for the tightness test of the system. This element can be crucial in case of inspections and safety checks and certainly facilitates the maintenance of the MAIA PLUS D 24 J boiler.
In fact, during the maintenance of the appliance, it is mandatory to perform a suitable test like UNI 11137:2019 that verifies the correct tightness of the gas system.
Flushing the Heating System
Flushing the heating system is crucial to prevent clogging of the primary exchanger of the Euroterm MAIA PLUS D 24 J boiler. Over time, especially in cast iron or aluminum systems, a metallic sludge can form that can clog the narrow passages of the exchanger.
After flushing the system, it is highly recommended to install a magnetic sludge filter on the Euroterm MAIA PLUS D 24 J boiler. This filter plays an essential role in protecting the exchanger from the buildup of dirt and debris, ensuring greater efficiency and longevity of the heating system.
Additional improvements can include the installation of an advanced thermostat with relay function. This device allows for more effective management of heating hours, helping to optimize energy consumption.
Accessory Guide
Elevate the performance of your MAIA PLUS D 24 J boiler with our selection of essential accessories, we recommend:
- New Generation Programmable Thermostat: Manage ambient temperature with precision and ease, thanks to intelligent programming and remote control.
- Magnetic Filter Dirt Separator: Protects your heating system from harmful residues, ensuring greater longevity and efficiency.
Magnetic Filter for Heating
Considered the best accessory to block the entry of dust and debris from the heating system into the device.
Installing the magnetic filter on the heating return line is a crucial step in ensuring the longevity of the boiler. This device effectively separates and retains any particles that could cause damage or inefficiencies in the device, including preventing blockage of the primary exchanger. Its presence also ensures less stress on the diverter valve, increasing its reliability and reducing the risk of malfunctions.
Polyphosphate Dosing Pump
If the hardness of the tap water exceeds 20 French degrees, we suggest equipping the boiler with a polyphosphate doser.
This powder or liquid additive is proportionally mixed with the cold water entering the boiler and decreases the formation of limescale inside the device. Polyphosphates need to be replenished whenever they run out.
There are various models, but the most common ones are:
- Powder Polyphosphates
- Liquid Polyphosphates
Clearly, the type of polyphosphate requires a suitable mechanism for mixing.
Customize Home Climate with a Thermostat
Get the most out of your Euroterm MAIA PLUS D 24 J boiler with a customizable room thermostat or programmable thermostat.
These solutions allow you to create the ideal home environment by regulating the temperature according to your specific needs. Choose a programmable thermostat to set varied schedules, adapting the home climate to your daily and weekly rhythms and improving energy efficiency.
Among the available models, you will find:
- Daily Programmable Thermostats
- Weekly Programmable Thermostats
- Smart Thermostats with Smart Functions
The ideal choice should respond to your preferences and the technical characteristics of your Euroterm MAIA PLUS D 24 J boiler.
Daily Programmable Thermostat
The daily programmable thermostat is an effective solution for daily temperature control in your home.
This device allows you to set the desired temperature for each individual day, enabling flexible management adaptable to your daily routines. It is ideal for those seeking simple yet precise control of home heating, with the ability to adjust settings according to variations in their daily schedule.
Typical features of a daily programmable thermostat include:
- Easy and intuitive programming
- Precise temperature adjustment
- Energy-saving functions
This type of thermostat is an optimal choice for those who want to combine comfort and energy efficiency without the need for complex weekly programming.
Weekly Programmable Thermostat
For advanced and personalized home temperature management, the weekly programmable thermostat is an excellent choice.
This device allows for setting different temperatures for various days of the week, perfectly adapting to different weekly routines. It is ideal for those who need detailed heating control, with the ability to set lower temperatures on days when the home is empty and higher when it is occupied.
Key features of the weekly programmable thermostat include:
- Flexible programming for each day of the week
- Advanced energy-saving functions
- Intuitive user interface for easy programming
A weekly programmable thermostat is perfect for those seeking a balance between comfort, convenience, and energy efficiency, providing precise control of the home climate.
Advanced New Generation Thermostats
New generation advanced thermostats offer cutting-edge technologies for optimal home climate control.
These devices stand out for their learning capability and adaptation to user habits, automatically adjusting the temperature based on daily and seasonal patterns. With features like remote control via smartphone and integration with home automation systems, they offer an unprecedented level of convenience and energy efficiency.
Salient features of these thermostats include:
- Wi-Fi connectivity and remote control
- Integration with voice assistants and smart home systems
- Learning algorithms for automatic temperature optimization
For those seeking the utmost efficiency, convenience, and personalization in home temperature control, an advanced new generation thermostat is the ideal choice.
Frequent Questions
To help you resolve doubts and questions about your Euroterm MAIA PLUS D 24 J boiler model, we have prepared a list of Q&A covering the most common issues. Find the answers you are looking for optimal use of your appliance.
Hot Water takes forever to reach the shower/bathroom !!
The delay in hot water reaching the bathroom is often caused by a buildup of dirt in the aerator or showerhead holes. This buildup can reduce water flow, consequently slowing down the flow of hot water in the pipes. Cleaning these accessories from limescale can usually restore the speed of the hot water arrival.
Additionally, if the pipes connecting the bathroom to the boiler are made of iron, they might absorb some of the water’s heat, lengthening the time for hot water to arrive. The presence of iron pipes can thus affect the timing of hot water delivery to the bathroom.
What is the difference between COMFORT 1 and COMFORT 2?
The manufacturer offers two COMFORT functions for the MAIA PLUS D 24 J boiler, activated through the ECO/COMFORT1/COMFORT2 button.
- Comfort 1: In this mode, you can adjust the domestic hot water temperature using the + and – buttons (near the faucet symbol).
- Comfort 2: In this mode, the temperature is fixed at 45°C without the possibility of adjustment.
Opentherm Protocol Support by the Boiler
YES: The boiler is equipped with non-powered thermostatic connections, compatible with Smart Thermostats or Remote Controls. This allows the use of advanced functions such as:
- Adjusting the domestic hot water temperature: Ideal for MAIA PLUS D 24 J boilers installed in hard-to-reach areas.
- Adjusting the radiator temperature: With the Opentherm chronothermostat, it is possible to adjust the radiator temperatures directly from the boiler.
- Setting operating times for domestic hot water: A feature that helps to reduce the maintenance costs of the boiler for models with storage tanks.
- Fault Management: Using the Opentherm 2 protocol or a specific remote control from Euroterm.
- etc…
Pressing the buttons to adjust the heating, the temperature does not change.
The button panel is sensitive to repeated presses after years of operation. Often, the malfunction of the adjustment buttons is due to the absence of a thermostat, which has led to the exclusive use of the boiler’s buttons.
In light of this, it is suggested to install a new control board to restore the correct functioning of the button panel, but also to integrate a thermostat to continue adjusting the heating from another, more reliable, and less expensive device.
