Condensing Boiler Radiant R2K 34 Manual – Complete PDF Guide

The condensation technology used by the boiler Radiant R2K 34 allows the recovery of latent heat from the water vapor in the combustion fumes. This process ensures greater energy efficiency compared to conventional boilers.

Traditional boilers do not fully exploit the sensible heat of the fumes to avoid corrosion caused by condensation. Thus, the water vapor produced in combustion is released into the atmosphere, dissipating precious heat. Condensing boilers, on the other hand, effectively use this heat, significantly reducing energy consumption. Replacing an old boiler with a condensing one can lead to energy savings of up to 20%.

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.

Winter Boiler Maintenance: Complete Guide

• Pressure Check: Ensure that your Radiant R2K 34 boiler’s pressure gauge shows adequate pressure.
• Thermostat Maintenance: Regularly check the thermostat batteries to avoid malfunctions during the colder months.
• Heating System Pressure: Check that the pressure is maintained between 1 and 1.5 bar for optimal operation.
• Professional Support: For thorough maintenance and cleaning of your Radiant R2K 34 boiler, always contact qualified personnel.

Maintaining Heating System Pressure

It’s essential to check the heating system’s pressure quarterly, ensuring it’s between 1bar and 2bar. This check should not be neglected even during the summer months, as the radiator water is used for hot water production. A drop in pressure can interrupt the boiler’s operation.

To adjust the pressure, use the filling tap under the appliance. Open it to bring the pressure to 1.5bar, then close it.

Effective Temperature Settings

To make the most of your Radiant R2K 34 boiler, it’s crucial to understand how to effectively adjust the temperatures. This not only optimizes home comfort but also helps prevent limescale accumulation.

Focus on Temperature Adjustment:

• Heating Temperature: Be careful to adjust the radiator temperature, not the ambient temperature.
• DHW Temperature: A lower DHW temperature reduces the risk of calcification.

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 Radiant R2K 34 boiler.

Boiler Safety During the Holidays

It’s crucial to take some precautions with your Radiant R2K 34 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.

Efficiency in Hot Water Production

The R2K rapid instant boiler is synonymous with efficiency: equipped with a precision flow meter, it detects hot water usage and regulates the temperature to optimal levels, perfect for high-rise buildings. Easily set the desired temperature, and the system will ensure a constant and immediate supply of hot water.

FAST-H2O Function for Comfort

With the FAST-H2O technology, the sanitary water is preheated in the coil, ensuring rapid and continuous supply, eliminating waiting and waste. This innovative feature enhances the user experience, always ensuring the ideal temperature.

• Instantaneous hot water supply
• Elimination of waiting and improved comfort
• Efficiency and waste reduction

To activate the FAST-H2O function, use the and buttons on the control panel.

The Electronics

Regarding the electronics of this boiler, the control board is provided by NORDGAS, a trusted partner of {manufacturer} for many years. The NORDGAS board is cutting-edge in terms of essential modern boiler systems. Notably, it includes a daily auto-reset system for the board memory, an air venting cycle that starts after refilling the boiler following a water shortage error, and control of thermal shock in heating. {manufacturer}’s board features an exceptional user interface with essential buttons for operation, differentiating it from other boilers with numerous buttons. Error control is precise and easy to read, allowing technicians to receive accurate error information over the phone for an initial diagnosis.

Error Control

The {name} boiler signals all errors through a flashing code on the display, with the main ones being:

• Error 01: No flame, which can occur if the gas tap is closed or if the meter has been changed. Press the button. In all other cases, if it does not restart, call a technician.
• Error 03: Flue side thermal fuse tripped. Press the button. If it does not restart, call a technician.
• Error 04: No water in the system. Refill the system via the black cylindrical tap under the boiler, keep an eye on the pressure gauge above the display, and close the refill tap when the pressure reaches 1.2 or 1.5 bar. The error resets itself, followed by an approximately 2-minute venting procedure. Please wait.
• Error 18: Insufficient circulation. This error may be caused by particularly dirty magnetic filters. Check the magnetic filter at the boiler inlet with a technician to restore the circulator flow rate.

Notifications

These refer not to errors but to functions currently in operation:

• F08 Anti-freeze function for heating active: If the boiler is external and reaches a very low temperature, this procedure activates to prevent the technical water from freezing. Please wait for the operation to complete.
• F33 System Venting Cycle: This usually happens during the reset of error E04. Once the {manufacturer} {name} boiler pressure is restored, it performs this function for about 2 minutes. Please wait for the operation to complete.
• FH Fast H20: The boiler is preparing to preheat the sanitary water. Please wait for the procedure to complete.

Energy Efficiency and Quietness

{manufacturer} has revolutionized energy efficiency with its boiler series, offering exceptional performance in terms of both gas and electricity consumption. These models, besides being extraordinarily quiet (about 55 decibels), boast reduced gas consumption, thanks to their 9 flame modulations and proportional temperature control. Electrical consumption is also minimized, thanks to the modulating WILO circulator and optimized standby consumption.

Boiler Usage Warnings

To ensure the safety, efficiency, and performance of the R2K 34 appliance, annual maintenance is crucial. It is highly discouraged to intervene inside the boiler without adequate technical skills. In case of anomalies or malfunctions, it is important to always consult a qualified technician. Annual maintenance by specialized personnel is essential for the safety and continuous functioning 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.

In Case of Gas Odor

• Do not operate electrical switches, the phone, or any other device that may generate electrical discharges or sparks.
• Immediately open doors and windows to create an air exchange that can quickly clear the room.
• Close the gas taps.
• Request the immediate intervention of professionally qualified personnel.

List of Components and Spare Parts

In this guide, you will discover everything there is to know about the different components and spare parts of the R2K 34 boiler: how to identify them, their specific function, and useful tips for maintenance and replacement.

Temperature Adjustment

On the control panel of the Radiant R2K 34 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 Radiant R2K 34 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).

Energy Efficiency of the {manufacturer} Heat Exchanger

The patented heat exchanger from {manufacturer} represents a qualitative leap in energy efficiency. Its concentric coil, managing both sanitary water and heating, lowers the exchanger temperature for better condensation. This not only improves thermal efficiency but also reduces lime scale formation, a significant benefit in areas with hard water like Modena.

The {manufacturer} R2K 24 boiler also includes an innovative system that induces vibrations in the piping to further reduce lime scale deposits, a step forward towards long-term sustainability.

Superior Efficiency with the Variable Speed Modulating Pump

Variable speed modulating pumps, now standard in the latest generation boilers, are designed to operate in a range from 0 to 100%, regulated by an advanced electronic control system. These pumps stand out for their energy efficiency, reducing costs and promoting responsible resource use. The ability of these pumps to adapt to the varying needs of the system, precisely regulating speed, results in a more efficient and environmentally friendly heating system. Current legislation emphasizes the importance of these pumps, making them an essential element in new boiler installations for greater sustainability.

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 Radiant R2K 34 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.

3/8 Automatic Air Purger

The 3/8 automatic air purger is a fundamental component in the Radiant R2K 34 boiler to ensure the elimination of air in the heating system. This small but essential device plays a critical role in maintaining the efficiency of the heating system.

Despite its low cost, this component is vital to ensure that there is no trapped air in the radiator system, especially for aluminum ones, where the presence of air can be a frequent problem, particularly after long periods of inactivity like during the summer.

Checking the functionality and replacing the air purger is always advised to prevent circulation problems at the beginning of the heating season. Its efficiency 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 R2K 34 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.

Possible Improvement Works

The condensing boiler Radiant R2K 34 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 R2K 34 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 Radiant R2K 34 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 Radiant R2K 34 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 R2K 34 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.

The magnetic filter, installed on the heating return line to the boiler, is essential for maintaining system efficiency. It retains harmful elements like dust and debris, preventing boiler blockage and reducing the risk of overheating the primary exchanger. Additionally, it helps to reduce pressure on the diverter valve, thus increasing its lifespan and reducing the chances of leaks.

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.

Integrated Solutions: Thermostat and Programmable Thermostat

For advanced and integrated control of the Radiant R2K 34 boiler, choose a latest generation room thermostat or programmable thermostat.

These devices offer sophisticated home temperature regulation, perfectly adapting to your lifestyle and needs. With programmable thermostats, you can easily set custom schedules for each day of the week, ensuring a consistently comfortable environment and optimizing energy consumption.

Select from a variety of models, including:

• Daily Programmable Thermostats
• Weekly Programmable Thermostats
• Connected Thermostats for Remote Control

Your choice should complement the specifics of your Radiant R2K 34 boiler and your home.

Daily Environmental Thermostat: Regulatory Compliance and Economy

The daily environmental thermostat is the ideal solution for complying with regulations requiring at least two temperature levels within 24 hours, combining efficiency and simplicity.

This device ensures the ability to set different temperature levels throughout the day, perfectly adapting to various needs and contributing to energy savings. Its ease of use makes it suitable for all ages, including seniors.

• Flexible programming and compliance with regulations
• Easy to use for all age groups
• Affordable cost and great added value

An economical and functional option for those looking for effective home temperature control without complexity.

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.

INFO MENU DISPLAY DATA

To view the boiler data from info menu you just have to press the INFO key. The info code will be displayed on the left side of the screen and its relative value will be displayed on the centre of the screen.
Use keys ‘ + ’ and ‘ – ’ of the heating circuit to scroll through the list of displayed data. To exit display mode press the INFO ‘ i ’ key.

Anomaly Reporting Codes R2K 34

To display the last 5 anomaly reporting codes, from the most recent in chronological order, activate OFF mode using the central button and hold down the INFO button for 5 seconds. To scroll through the list of stored anomalies, use the PLUS and MINUS buttons of the heating system. To reset the anomaly history, press the RESET button. To exit the display environment, press the INFO button.

Frequent Questions

To help you resolve doubts and questions about your Radiant R2K 34 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.

Loud Noises During Operation

If your Radiant R2K 34 boiler makes loud noises during operation, first check the system pressure. Too low a pressure can be the cause. Otherwise, in this condensing boiler, it could occur due to lack of maintenance.

Indeed, the heat exchanger tends to slightly oxidize during operation and over time a large amount of dirt can accumulate in the condensate siphon. Regular maintenance is essential to reduce the risk of noises or machine shutdowns.

Boiler Compatibility with Opentherm

YES: The boiler’s thermostat connections are configured for a non-powered interface, allowing connection to a Smart Thermostat or Remote Control. The possibilities offered include:

• Adjustment of domestic hot water temperature: Particularly beneficial when the R2K 34 boiler is located in less accessible places like the attic or an external technical room.
• Adjustment of radiator temperature: The advanced Opentherm chronothermostat allows communication with the boiler to regulate radiator temperatures in addition to room temperature.
• Time scheduling for domestic hot water: Ideal for boilers with storage tanks, it enables optimization of boiler maintenance costs, such as gas consumption.
• Diagnostics and Error Management: With the Opentherm 2 protocol or via a specific remote control from Radiant.
• 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.

Downloadable Manuals

• Radiant R2K 34 Condensing Boiler Manual