Condensing Boiler Euroterm AURA PLUS K 28 S Manual – Complete Guide

The condensing boiler Euroterm AURA PLUS K 28 S is a boiler in which the water vapor in the flue gases condenses. This process allows for the recovery of latent heat of condensation, consequently offering higher energy efficiency compared to a traditional boiler.

In fact, traditional boilers use only part of the sensible heat of the combustion fumes because it is necessary to avoid the condensation of the fumes, which would lead to corrosive phenomena. The water vapor generated by the combustion process is thus dispersed into the atmosphere through the chimney, along with the associated latent heat. Gas heating based on condensation technology is always a good choice. In addition to modest efforts and relatively low installation costs, energy consumption is also reduced by 20% when replacing an old boiler.

Annual Maintenance and Safety

To ensure that the boiler maintains its safety and efficiency performance, it is essential to subject it to regular maintenance every year. The annual review is vital to ensure the safety and proper ongoing operation of the device.

Boiler Checklist: Winter Preparation

• Boiler Pressure Check: Verify the pressure via the pressure gauge to ensure optimal performance.
• Thermostat Management: Check the batteries of the thermostat for accurate temperature regulation.
• System Pressure: Ensure that the heating system pressure is appropriate, between 1 and 1.5 bar.
• Professional Maintenance: Schedule professional maintenance for cleaning and inspection of your Euroterm AURA PLUS K 28 S boiler.

Heating System Pressure Control

It’s important to check quarterly that the system pressure is maintained between 1bar and 2bar. This check is also necessary in summer, as the boiler uses radiator water to heat sanitary water. Too low a pressure can interrupt the production of heating or hot water.

Use the filling tap, located under the appliance, to adjust the pressure. Open it until the pressure reaches 1.5bar, then close it.

Suggested Temperatures

The Euroterm AURA PLUS K 28 S boiler can always produce the temperature you want for heating according to your needs. You can adjust the temperatures via the control panel, but we suggest setting the hot water temperature (DHW) to the minimum necessary due to limescale and domestic hot water (DHW) considerations.

Attention to temperature settings:

• The heating temperature setting refers to the radiator temperature, not the ambient temperature.
• The domestic hot water temperature setting should be kept as low as possible to avoid calcification inside the secondary heat exchanger.

Preventing Limescale in Showers: Filters and Shower Heads

Preventing limescale buildup in shower head aerator filters is crucial for maintaining an efficient sanitary system. Excessive buildup can complicate the removal of aerators and lead to unwanted overheating. We recommend regular replacement of these elements to preserve the functionality of the Euroterm AURA PLUS K 28 S boiler.

Boiler Safety During the Holidays

It’s crucial to take some precautions with your Euroterm AURA PLUS K 28 S boiler before leaving for the holidays to prevent accidents and problems. This also applies to the latest generation boilers.

Preventive actions:

• Close the main water tap to avoid unexpected leaks.
• Shut off the gas to increase the safety of your home.
• Turn off the heat generator to limit unnecessary energy consumption.

Once you return, reactivate the settings by following the steps in reverse. You might need to restart the heat generator to cancel the shutdown errors.

With these simple steps, you can enjoy your vacation without worries, knowing that your boiler is safe and well managed.

Boiler AURA PLUS K 28 S Display Interface

The AURA PLUS K 28 S boiler’s display is designed to provide all essential information in a clear and accessible manner. Let’s look at the details:

• PLUS and MINUS Thermo: Increase and decrease the radiator temperature (independent of ambient temperature).
• ECO/COMFORT: Select between ECO/COMFORT1/COMFORT2 modes for water heating.
• RESET: Resets errors (except water shortage) and accesses the menu with prolonged pressure.
• SUN/SNOWFLAKE: Switch between Summer/Winter modes.

Display symbols and indications:

• SUN/SNOWFLAKE: Indicates the boiler’s seasonal mode.
• ECO/COMFORT: Status of the domestic hot water mode.
• 1.2 bar: Current pressure level of the boiler.
• Drop Symbol: Symbol representing the flame’s power, varies in size.
• Upper Temperature: Temperature of the primary circuit, also observable during DHW production.
• Lower Temperature: Current temperature of the sanitary water.

Managing Domestic Hot Water with the Boiler

The production of domestic hot water (DHW) in the boiler is enhanced with the addition of micro-accumulation and the COMFORT option, accessible from the control panel. Various modes are available, including ECO, COMFORT1, and COMFORT2.

Features of ECO Mode

In ECO mode, DHW is supplied only on demand. When a tap is opened, the boiler activates, and the flow meter adapts the flame based on the water flow, allowing precise temperature regulation. This method may cause a slight delay in the delivery of hot water due to micro-accumulation.

Features of COMFORT Mode

In COMFORT mode, with its two variants, DHW is preheated. COMFORT1 allows the user the freedom to set the temperature, while COMFORT2 maintains a constant temperature of 45 degrees.

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.

Accessory Guide

Elevate the performance of your AURA PLUS K 28 S 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.

Magnesium Anode

The magnesium anode is the primary solution for preventing corrosion in the Euroterm AURA PLUS K 28 S boiler’s accumulation tank. This highly reactive component protects the boiler’s metal parts from oxidation, ensuring longevity and efficiency.

It is important to periodically replace the magnesium anode, depending on the water conditions and the usage of the boiler.

Possible Effects of the Magnesium Anode

Rarely, due to strong electrical influences:

• The magnesium anode may wear out very quickly.
• Due to rapid consumption, a lot of air may form and exit the tap after long periods of non-use (night).
• A slight sulfur odor may be detected after several months of boiler inactivity.

The effects related to air tend to subside shortly after the first few weeks of maintenance. However, it can be resolved at the next maintenance opportunity by preferring an aluminum anode, which also has a longer lifespan.