instruction manual for RADIANT R2K 28 boiler english pdf

The RADIANT R2K 28 condensing boiler is a boiler in which water vapor from combustion products condenses, thereby recovering latent condensation heat and consequently achieving greater energy efficiency.

In fact, traditional boilers only utilize a part of the sensible heat from the combustion fumes because it is necessary to avoid the condensation of the fumes, which would cause corrosive phenomena. The water vapor generated by the combustion process is then dispersed into the atmosphere through the chimney, along with the associated latent heat.

For air intake/exhaust, specific conduits and systems for original condensing boilers as prescribed by the manufacturer, resistant to the attack of condensing acids, must be used. The flue pipes must be installed with an inclination towards the boiler that ensures the reflux of the condensate towards the combustion chamber designed to collect and discharge the condensate. Should this not be possible, it is necessary to install systems capable of collecting and conveying the condensate to the drainage system at the condensate stagnation points. It is necessary to avoid stagnation points of condensation in the combustion product evacuation system, except for the baffle of the possible siphon connected to the evacuation system. Regarding the condensate, its recovery by the user is forbidden; generally, stagnation points should be avoided. Collection in tanks and use for watering plants is also prohibited.

Common Procedures

The boiler's annual maintenance is essential to maintain the conventional warranty RADIANT . To keep unchanged the safety and performance characteristics that distinguish the device, annual maintenance must be carried out.

Annually or at the beginning of the winter season

• Regularly check the pressure shown on the pressure gauge.
• Ensure that the heating system pressure is between 1 and 1.5 bar.
• Check the charge of the room regulator batteries.
• Contact an authorized assistant to perform maintenance and cleaning.

Going on Holiday

All boilers, even the most recent ones, have a remote chance of leakage. It is advisable to adopt a series of measures to help you stay more relaxed during your holidays:

• Turn off the thermal appliance.
• Close the domestic water meter.
• Shut the gas meter.

Upon your return, reverse all the procedures. Afterward, you may need to reset the heat generator from the ignition failure error.

Recommended Temperatures

The thermal appliance RADIANT R2K 28 is always capable of producing the temperature you need for heating and domestic hot water (DHW). Temperature regulation can be done through the control panel. However, we suggest adjusting the heating temperature according to your needs and the hot water temperature to the bare minimum necessary due to scale. We suggest using lower temperatures to promote the principle of condensation.

Cleaning Faucet Aerators and Shower Heads

To ensure your boiler's efficiency and to reduce problems, it is crucial to have quality aerators for faucets and shower heads. These accessories, simple but effective, help to reduce the overheating of sanitary hot water, limiting the frequent ignitions and shutdowns of the boiler during the production of hot water. Their use optimizes water flow, conserving energy and reducing costs.

Errors, Anomalies and Troubleshooting

The display, in case of error or anomaly, shows the anomaly code, error control allows the boiler to work safely, so adhere to the instructions provided with the boiler.

Adjustments and errors of the boiler RADIANT R2K 28

On the control panel of the condensing boiler RADIANT R2K 28 , you will find all the operating information. In particular, the two symbols for tap and heating can be changed by repeatedly pressing the central button (not shown), these two symbols help you understand if the boiler is in Summer or Winter mode. These two symbols flash when the boiler is engaging in serving the specific function.

Normally, the boiler shows you the delivery temperature, you should interpret this temperature as the internal temperature of the boiler. Because of this, you will see the temperature rise even in summer when the boiler RADIANT R2K 28 is producing hot water, while in winter it can be interpreted as the current temperature of the radiators

Through the + and - buttons on the left for heating and on the right for domestic hot water, you can choose the desired temperatures for heating, which we suggest:

• From 45°C to 60°C if you have cast iron radiators
• From 55°C to 65°C if you have aluminum or steel radiators
• From 25°C to 38°C if you have underfloor heating

Instead, regarding domestic hot water, you can choose the temperature through the + and - buttons on the right, which we suggest:

• A temperature between 38 and 45°C

The general advice about the temperature of domestic hot water is to keep it as low as possible if your water supply is very hard (above 30°F).

Errors and Notifications

We describe the most common errors of the boiler RADIANT R2K 28 :

• Error E18: Insufficient circulation, the boiler RADIANT R2K 28 checks the flow of technical water circulation, the magnetic filter may be dirty to the point of preventing the circulation of the system, clean it. Otherwise, contact the service.
• Error E03: Flue side thermal fuse interrupted. This is an error that concerns the flue side thermal fuse, contact the service.
• Error E04: Lack of Water. Check the pressure gauge in the center of the boiler R2K 28 , if the needle points to a value less than 0.8 bar, this error appears. To reset the error, act on the filling tap placed underneath (usually cylindrical and black) to bring the pressure back to about 1.5 bar, the error is reset automatically and the display will show the inscription F33
• Error E01: Flame blocking, can happen when the gas meter is replaced, the error is resettable through the R-button. Otherwise, contact the service.
• Label F28: Beginning of Anti-Legionella treatment, The boiler enters this state: Half an hour after power has been supplied and all subsequent weeks at this time and this day of the week from the first power supply. The treatment involves heating the sanitary water up to about 60°C, so be careful of the risk of scalding. You can decide the best time for this treatment by turning off the boiler late one evening; subsequently, the internal counter of the condensing boiler R2K 28 will perform the treatment once a week in the evening, allowing the boiler to dispose of the temperature by the following morning.
• Label F33: Normally displayed after restoring the boiler's pressure RADIANT R2K 28 , consists of the air vent cycle. The boiler commits to venting the air circulating within the technical water, this procedure lasts about 2 minutes.

Heating Issues

From our experience, most of the problems encountered with the thermal appliance R2K 28 can be solved by changing the batteries of the room thermostat or by checking the pressure. It is also good to try resetting the boiler, with the reset button, as per the instructions. Indeed, there may have been a recent change of the gas meter, or the general gas valve has been closed, so check if the burners ignite correctly and eventually purge the air.

Then move on to checking the room regulator:

• Have you used rechargeable batteries? rechargeable batteries do not have sufficient amperage for operation.
• Has the heat request icon appeared? Try to enter manual mode and raise the requested temperature.
• If your room thermostat has reference seasons, make sure that the winter mode is correctly selected
• You can perform a test by raising the temperature at the room thermostat, especially in the fall when the outside temperatures are not too low, it is common for the radiators and.or underfloor heating to be cold.

Components and Spares

The boiler's display RADIANT R2K 28

Suggested Accessories

list of indispensable and suggested accessories

Room Thermostat

The use of a room thermostat is fundamental to maintain optimal control over the boiler, ensuring both comfort and energy efficiency. This simple but effective device allows you to regulate the temperature at home according to your needs, ensuring that the boiler operates only when necessary. This not only improves the comfort of living but also reduces energy consumption and management costs. Installing a quality room thermostat can make the difference between a pleasantly heated environment and unnecessary energy waste. With precise temperature regulation, the room thermostat helps to avoid excessive overheating and ensures that the boiler operates efficiently, prolonging its lifespan and preserving its performance over time.

Daily Room Thermostat

For pensioners who spend most of their time at home, the daily room thermostat represents an ideal choice. This device allows you to regulate the internal temperature precisely and constantly throughout the day, ensuring a comfortable environment and efficient energy use. The ability to set and maintain a stable temperature, without the need for frequent adjustments, perfectly adapts to the needs of those who spend most of the day at home. Moreover, a daily room thermostat contributes to reducing heating costs, avoiding energy waste and ensuring that the boiler operates optimally. Its ease of use makes it accessible and easy to manage, even for those not particularly accustomed to modern technologies, ensuring comfort and tranquility at all times of the day.

Here are some models of daily thermostats compatible with the Radiant R2K 28 boiler

Weekly Room Thermostat

For families in work activity, the weekly room thermostat proves to be an indispensable ally to manage domestic heating efficiently. This device allows you to program the ideal temperature for each day of the week, perfectly adapting to the different rhythms and needs of a dynamic family. Just like the daily room thermostat, it is essential that there is already an existing thermostat connection to facilitate its installation and use. With weekly programming, the thermostat ensures that the house is warm and welcoming when the family is present, and that the heating is reduced or switched off during work hours or absence, optimizing energy consumption and reducing costs. This approach not only ensures tailor-made comfort but also intelligent energy management, contributing to a reduced environmental impact. Weekly programming adapts to the fast-paced life of modern families, offering a practical and functional solution for controlling domestic heating.

New Generation Room Thermostat

New generation room thermostats represent the advanced frontier in controlling domestic heating, offering innovative and high-tech features. One of the most appreciated features of these devices is the ability to turn on the heating remotely, allowing users to heat their home before returning, thus ensuring a comfortable environment upon their arrival. Some advanced models also come with screens that display operation statistics, providing users with detailed data on use and energy efficiency, allowing for a more aware management of heating.

Moreover, a revolutionary feature of some latest generation thermostats is their ability to self-regulate. These devices can automatically adapt the weekly heating programming based on the detected presence in the home environment, using the smartphone signals of the house's inhabitants. This ensures that the heating is active only when necessary, further optimizing energy use and reducing costs. This intelligent technology makes new generation thermostats indispensable tools for a modern, efficient, and connected home, adapting perfectly to the needs of a dynamic and technologically advanced lifestyle.

All these thermostats can be connected to the RADIANT R2K 28 boiler.

Water Treatment

Water treatment is essential to protect the RADIANT R2K 28 boiler from problems such as scale and dirt. By using water treatment systems, harmful buildups inside the boiler are prevented, ensuring efficient operation and prolonging the appliance's lifespan. This step is particularly important in areas with hard water, where scale can accumulate quickly, reducing efficiency and increasing maintenance costs. Adequate water treatment is an investment that protects the boiler and ensures optimal performance over the long term.

Polyphosphate Doser

The polyphosphate dosing pump is a fundamental tool for the maintenance and protection of boilers, such as the RADIANT R2K 28, against damage caused by scale and other residues. This device adds a controlled amount of polyphosphates to the water, helping to prevent the formation of scale and corrosion inside the heating system. The use of a polyphosphate dosing pump is particularly useful in areas with hard water, where the risk of scale buildup is higher. By installing a dosing pump, you ensure greater longevity of the boiler and maintain constant efficiency over time, reducing the frequency and costs of maintenance.

Here is a list of dosing pumps that we feel confident in suggesting:

Magnetic Filter Sludge Remover

The magnetic filter sludge remover is a crucial component for safeguarding and maintaining the performance of boilers, including the RADIANT R2K 28. This filter is responsible for capturing ferrous particles and impurities present in the heating water, preventing the accumulation of debris and the formation of sediment within the system. Its use is particularly recommended in heating systems that may be subject to blockages or internal corrosion. With a magnetic filter sludge remover installed, the boiler operates more effectively and with less wear and tear over time, ensuring a longer lifespan and reducing the need for frequent maintenance interventions.

Here is a list of magnetic filter sludge removers that we feel confident in suggesting:

General Warnings for Use

For the warranty to commence, the heat generator must be put into operation by an authorized RADIANT Technical Assistance Center within, and no later than, 30 days from the date of installation. It is necessary to test the heat generator by an authorized service center before starting the boiler. The customer, to take advantage of the warranty provided by the manufacturer, must scrupulously and exclusively follow the prescriptions indicated in the user section of the manual. This boiler must be intended for the use for which it was expressly built: heating water to a temperature lower than that of boiling at atmospheric pressure. Any other use is to be considered improper and therefore dangerous. The manufacturer assumes no contractual or extra-contractual liability for damages caused to people, animals, or things resulting from improper use. Do not obstruct the ventilation openings of the room where a gas appliance is installed to avoid the occurrence of toxic and explosive mixtures. Do not allow the boiler to be used by people, including children, whose physical, sensory, or mental abilities are reduced, or who lack experience or knowledge, unless they have benefited, through the intermediation of a person responsible for their safety, from supervision or instructions on the use of the appliance.

Warnings about the use of electricity

• Do not leave the device exposed to atmospheric agents such as rain, sun, etc., unless expressly provided for.
• In case of cable damage, turn off the device and exclusively approach professionally qualified personnel for its replacement.
• Do not touch the appliance with wet or damp parts or with bare feet.
• Do not pull the electrical cables.

In case of gas smell

• Do not operate electrical switches, the phone, or any other device that may generate electrical discharges or sparks.
• Close the gas taps.
• Ask for immediate intervention by professionally qualified personnel.
• Immediately open doors and windows to create an air exchange that can quickly clean the room. Common Questions and Answers Technical Specifications Table