Boiler Euroterm AURA R K 18 S PDF Manual – Complete Guide for Use and Maintenance
With the Euroterm AURA R K 18 S condensing boiler, you achieve both heating and domestic hot water efficiently with the aid of an external boiler. The advanced condensing technology improves energy yield, requiring a drain for the condensate.
The innovative design of this boiler makes it compatible with solar systems, offering an energy alternative even when the solar system cannot provide sufficient heat.
Common Procedures
To maintain the safety, efficiency, reliability, and performance characteristics that distinguish the appliance, it is necessary to perform maintenance annually. Annual maintenance is essential for safety and continuous operation.
Suggested Temperatures
The Euroterm AURA R K 18 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.
General Usage Information
To maintain the safety, efficiency, reliability, and performance characteristics that distinguish the device, it is necessary to perform annual maintenance. Annual maintenance is essential for the safety and continuous use of the AURA R K 18 S device.
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.
Safety Actions in Case of Gas Detection
If a gas odor is detected, it is fundamental to adopt these precautionary measures:
- Do not use electrical appliances, including phones, that might generate sparks.
- Immediately open doors and windows to facilitate air exchange.
- Stop the gas supply by closing the taps.
- Immediately request the intervention of a specialized technician.
It is important to use the AURA R K 18 S boiler exclusively for the purposes for which it is designed, avoiding improper uses that can be dangerous. Ensure that any intervention on the boiler is carried out by qualified personnel to prevent accidents and maintain the warranty.
Index of Components and Spare Parts
Use this section as an index to navigate through the different components and spare parts of the AURA R K 18 S 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.
Boiler AURA R K 18 S Display Interface
The AURA R K 18 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.
Hot Water Production Mode in the Boiler
The production of domestic hot water (DHW) is enhanced with the introduction of the new COMFORT mode, selectable from the boiler’s control panel. The different modes include ECO, COMFORT1, and COMFORT2.
ECO Mode
In this boiler version, ECO mode turns off the domestic hot water.
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 AURA R K 18 S 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 AURA R K 18 S 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).
Quick Solutions for Errors
- Error A01: Encountered a flame lock? No problem, just press the Reset button for an easy reset. If it persists, our support team is ready to help you.
- Error F37: Low water pressure? Simply adjust the filling tap to reach the optimal pressure of 1.5 bar. You’ll see error F37 transform into FH on the display, a sign of a perfect reset.
- FH: When you see FH on the display, your boiler is simply eliminating excess air. A brief two-minute process to always ensure the best operation.
Multi-Layer Aluminum Heat Exchanger
The heart of the Euroterm AURA R K 18 S boiler is the multi-layer aluminum heat exchanger, an innovative component consisting of a ceramic burner and a set of fins. This exchanger is where the flame is produced and heat is collected to be transferred to the heating system.
Maintaining the efficiency of the exchanger requires precise maintenance. It is important to remove aluminum oxide dirt that forms between the fins to ensure proper operation. Effective cleaning of this exchanger is achieved through the use of a special alkaline gel followed by a vigorous rinse.
Another crucial aspect is cleaning the condensate siphon, neglect of which can cause the exchanger to reach high temperatures. Overheating of the exchanger, due to poor cleaning, can lead to expansion and subsequent breakage of the aluminum fins. In case of damage, the exchanger is replaced.
Grundfos UPS15/60 Boiler Circulator
The Grundfos UPS15/60 circulator is an optimal solution for water circulation in AURA R K 18 S 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 AURA R K 18 S 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.
Ferroli Insert for Diverter Valve
The motor for the diverter valve, known as the Ferroli diverter valve insert, is a vital component in boilers. This motor functions to direct the heat produced by the primary exchanger of the boiler towards the heating system or the sanitary water heating system.
The insert, complete with a motor and suitable power connector, easily fits into the housing of the diverter valve inside the boiler. This allows precise control of the heat flow between the different circuits of the system.
However, the motor can encounter issues such as motor breakdown. A blockage of the mechanism can lead to situations where only the sanitary water is heated or, conversely, only the heating system is operational.
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 AURA R K 18 S 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.
Boiler Errors and Anomalies AURA R K 18 S
The control board of the Euroterm AURA R K 18 S boiler is always capable of detecting anomalies. These anomalies can be blocking or non-blocking, and some may require a reset procedure. Below is a list of anomalies that may occur in the AURA R K 18 S boiler.
Boiler Errors and Anomalies for AURA R K 18 S
| Anomaly Code | Anomaly | Possible Cause | Solution |
|---|---|---|---|
| A01 | Burner Ignition Failure | Lack of gas | Check that the gas supply to the boiler is regular and that air has been eliminated from the pipes |
| Anomaly in ignition/detection electrode | Check the wiring of the electrode and that it is correctly positioned and free of encrustations | ||
| Faulty gas valve | Inspect and replace the gas valve | ||
| Insufficient network gas pressure | Check the network gas pressure | ||
| Blocked siphon | Inspect and possibly clean the siphon | ||
| A02 | Flame Signal Present with Burner Off | Anomaly in electrode | Check the wiring of the ionization electrode |
| Anomaly in board | Check the board | ||
| A03 | Over-Temperature Protection Intervention | Damaged heating sensor | Check the correct positioning and functioning of the heating sensor |
| Lack of water circulation in the system | Check the circulator | ||
| Air in the system | Vent the system | ||
| A04 | Flue Safety Intervention | Anomaly F07 generated 3 times in the last 24 hours | See anomaly F07 |
| A05 | Fan Protection Intervention | Anomaly F15 generated for 1 consecutive hour | See anomaly F15 |
| A06 | No Flame After Ignition Phase (6 times in 4 min.) | Anomaly in ionization electrode | Check the positioning of the ionization electrode and replace it if necessary |
| Unstable flame | Check the burner | ||
| Anomaly in gas valve offset | Check calibration of Offset at minimum power | ||
| Blocked air/flue duct | Clear any blockage from chimney, flue ducts and air intake and terminals | ||
| F07 | High Flue Gas Temperature | Partially blocked or insufficient chimney | Check the efficiency of the chimney, flue ducts and exit terminal |
| Flue gas sensor position | Check the correct positioning and functioning of the flue gas sensor | ||
| F10 | Anomaly in Supply Sensor 1 | Sensor damaged or wiring short-circuited | Check the wiring or replace the sensor |
| F11 | Anomaly in Return Sensor | Sensor damaged or wiring short-circuited | Check the wiring or replace the sensor |
| F12 | Sanitary Sensor Anomaly | Sensor damaged or wiring short-circuited | Check the wiring or replace the sensor |
| Interrupted wiring | Verify the presence of interruptions in the wiring and proceed with repair or replacement if necessary | ||
| F13 | Flue Gas Sensor Anomaly | Sensor damaged or wiring short-circuited | Check the wiring or replace the sensor |
| Interrupted wiring | Verify the presence of interruptions in the wiring and proceed with repair or replacement if necessary | ||
| F14 | Supply Sensor 2 Anomaly | Sensor damaged or wiring short-circuited | Check the wiring or replace the sensor |
| Interrupted wiring | Verify the presence of interruptions in the wiring and proceed with repair or replacement if necessary | ||
| F15 | Fan Anomaly | Lack of 230V power supply or interrupted tachometric signal | Check the wiring of the 3-pole and 5-pole connectors |
| Damaged fan | Check the fan | ||
| F34 | Supply Voltage Below 170V | Electrical network issues | Check the electrical system |
| F35 | Abnormal Network Frequency | Electrical network issues | Check the electrical system |
| F37 | Incorrect Water Pressure in the System | Pressure too low or water pressure switch not connected or damaged | Recharge the system or check the sensor |
| F39 | External Probe Anomaly | Damaged probe or short-circuited wiring | Check the wiring or replace the sensor |
| Probe disconnected after activating the sliding temperature | Reconnect the external probe or disable the sliding temperature | ||
| A41 | Sensor Positioning | Supply sensor detached from the pipe | Check the correct positioning and functioning of the heating sensor |
| F42 | Heating Sensor Anomaly | Damaged sensor | Replace the sensor |
Possible Improvement Works
The condensing boiler Euroterm AURA R K 18 S requires special attention to the correct installation of the flue pipe. Especially in horizontal sections, condensation can form, compromising the functionality of the fan. It is not uncommon to see installations where the flue pipe (especially if corrugated) forms a siphon, causing the boiler to produce very loud noises. It is essential to have a qualified technician ensure that the pipes are in optimal condition.
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 AURA R K 18 S 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 AURA R K 18 S 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 AURA R K 18 S 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.
Innovative Accessories
Enhance the functionality of your AURA R K 18 S boiler with these cutting-edge accessories:
- Advanced Programmable Thermostat: Control the temperature of your home with intelligent solutions that offer flexible programming and interactivity.
- Magnetic Filter Dirt Separator: An indispensable accessory for maintaining the efficiency and cleanliness of your boiler’s hydraulic circuit.
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.
Choosing a Polyphosphate Doser
For hard waters exceeding 20 French degrees, we recommend the use of a polyphosphate doser for the Euroterm AURA R K 18 S boiler.
These devices mix polyphosphates, either in powder or liquid form, with the incoming water, minimizing limescale formation in the Euroterm AURA R K 18 S boiler. The choice of the right doser depends on the specific needs of the system and the type of water.
Polyphosphates are primarily available in two forms:
- Powder Polyphosphates
- Liquid Polyphosphates
The selection of the polyphosphate influences the type of mixing device required.
Customize Home Climate with a Thermostat
Get the most out of your Euroterm AURA R K 18 S 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 AURA R K 18 S boiler.
Daily Environmental Thermostat for Seniors
The daily environmental thermostat is particularly suitable for seniors, offering simple and immediate regulation of home temperature.
This device is ideal for those who desire an intuitive and uncomplicated control. Its daily programming allows for easy temperature adjustment to daily needs, making it particularly suitable for those who require a simple and reliable solution.
- Simple and clear user interface
- Easy temperature regulation
- Compliant with energy efficiency regulations
The daily thermostat is an economical and functional solution, ideal for those needing direct and easy heating control.
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.
Magnesium Anode Protection
To prevent corrosion in the Euroterm AURA R K 18 S boiler’s accumulation tank, the magnesium anode plays a key role. Its high reactivity safeguards the boiler’s metallic components from oxidation, ensuring optimal performance over time.
Scheduled regular changes of the magnesium anode are essential, based on specific usage conditions and water quality.
Issues with the Magnesium Anode
In some situations, such as in the presence of intense electrical fields:
- Rapid deterioration of the magnesium anode may occur.
- Accelerated consumption can produce excess air in the system, noticeable after periods of inactivity.
- An occasional sulfur smell may arise after long periods of boiler inactivity.
Air-related issues tend to decrease in the weeks following maintenance. Using an aluminum anode in future maintenance can offer a longer lifespan.
Aluminum Anode
The aluminum anode, used in boilers such as the Euroterm AURA R K 18 S, offers a longer lifespan compared to magnesium anodes. This flexible material allows for easy insertion and provides effective protection against corrosion.
The aluminum anode can last over 6 years, making it a cost-effective option for boiler maintenance.
Electronic Anode
The electronic anode is an advanced solution for corrosion protection in boilers like the Euroterm AURA R K 18 S. Thanks to its electronic control system, it monitors and adjusts the protective action according to the water conditions.
This type of anode requires less maintenance compared to traditional anodes and ensures more effective and long-lasting protection.
FAQ
Discover the answers to the most frequent questions about the Euroterm AURA R K 18 S boiler model. This quick guide has been compiled to provide clear and direct information based on the common questions from our users.
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 AURA R K 18 S 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 AURA R K 18 S 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.
