All about Boiler Radiant R1K 25 – Use and Maintenance Manual in PDF

The efficient Radiant R1K 25 condensing boiler is optimized for heating. Using condensation for heat recovery, it offers high energy efficiency and requires a drainage system for the condensate.

Ideal for environments that require heating only, this boiler represents an effective and sustainable solution.

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 R1K 25 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 R1K 25 boiler, always contact qualified personnel.

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 Radiant R1K 25 boiler allows you to produce the desired temperature for heating. You can adjust the temperatures through the control panel.

Attention to temperature adjustment:

• The heating temperature adjustment refers to the radiator temperature and not the ambient temperature.

A correct temperature setting will help you maintain optimal comfort at home.

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 Radiant R1K 25 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.

Advanced Technology and Safety

The R1K 25 boiler, with its cutting-edge technology provided by NORDGAS, ensures a safe and reliable user experience. Every aspect of the electronics is designed to maximize efficiency and safety, from the daily auto-reset system to thermal shock management and error control.

Advanced Error Management

The R1K 25 boiler uses a system of error codes for easy identification and resolution of problems. Errors are communicated through a clear display, allowing users to quickly understand the nature of the problem. Moreover, advanced features like the anti-freeze protection and the FAST-H2O sanitary water preheating system ensure maximum efficiency and comfort in every situation.

• 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 Radiant R1K 25 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.

Advanced Technology for Reduced Noise and Consumption

The Radiant boiler series stands out for the use of advanced technologies that ensure silent operation, equivalent to a whisper of 55 decibels, and superior energy efficiency. The innovative noise reduction system, including a MOPLEX muffler and a cushioned front panel, significantly reduces decibel levels. In terms of consumption, innovative techniques for flame modulation and temperature control, along with the modulating WILO circulator, ensure high performance with contained energy consumption.

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 R1K 25 device.

Regarding the Use of Electric Energy

• Do not touch the appliance with wet or damp parts, or while barefoot
• Do not pull on electrical cords
• Do not expose the appliance to atmospheric agents such as rain, sun, etc., unless expressly provided for.
• In case of damage to the cord, turn off the appliance and consult exclusively professionally qualified personnel for its replacement.

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 R1K 25 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.

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 R1K 25 boiler: how to identify them, their specific function, and useful tips for maintenance and replacement.

Temperature Setting

The control panel of the Radiant R1K 25 condensing boiler offers a clear interface for monitoring and adjusting temperatures. To adjust the heating temperature, use the + and – buttons next to the Radiator icon. Once the adjustment is made, the boiler briefly displays the set temperature before returning to the primary circuit temperature.

The displayed temperature represents the boiler’s outlet temperature, which in winter corresponds to the actual temperature of your radiators.

With the + and – buttons, you can customize the heat settings. We recommend setting:

• Between 25°C and 38°C for underfloor heating systems.
• Between 55°C and 65°C for aluminum or steel radiators.
• Between 45°C and 60°C for cast iron radiators.

Variable Speed Modulating Pump for Boilers

New generation boilers are now equipped with variable speed modulating pumps, ranging from 0 to 100%, directly controlled by the electronic board through a second control connector. These innovative pumps offer significant energy savings, considerably reducing operating costs. Their ability to modulate speed according to the actual needs of the system makes the heating system more efficient and environmentally friendly. Current regulations require the use of these pumps in all new boiler installations, emphasizing their crucial role in increasing the energy efficiency of domestic heating systems.

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 R1K 25 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 R1K 25 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 R1K 25 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 R1K 25 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 R1K 25 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 R1K 25 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 R1K 25 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.

Suggested Accessories

You might consider a range of accessories that would enhance the functionality of the R1K 25 boiler.

Magnetic Filter for Heating

Considered the best accessory to block the entry of dust and debris from the heating system into the device.

The decision to install a magnetic filter on the heating return line is an important one to maintain the effectiveness and reliability of the boiler. This component is essential for filtering debris that could otherwise accumulate and hinder the proper functioning of the boiler, particularly regarding the primary exchanger and the diverter valve. It’s important to choose a high-quality filter and ensure it is correctly installed to fully benefit from its advantages.

Room Thermostat and Programmable Thermostat

For optimal temperature control in your home, consider installing a thermostat or programmable thermostat for your boiler.

These devices allow you to regulate and program the temperature precisely, adjusting it to your daily needs. A programmable thermostat, in particular, offers the possibility to set different programs for specific days and times, optimizing comfort and reducing energy costs.

There are various models available, including:

• Daily Programmable Thermostats
• Weekly Programmable Thermostats
• New Generation Thermostats with Remote Control

The choice of model depends on your specific needs and the configuration of your heating system.

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.

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 R1K 25

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.

Common Questions and Answers About the Boiler

Here is a list of common questions and answers that we frequently receive about the Radiant R1K 25 boiler model. This section will help you better understand the features, functionality, and maintenance of your appliance.

Loud Noises During Operation

If your Radiant R1K 25 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.

Opentherm Protocol Support by the Boiler

YES: The boiler is pre-equipped for a tension-free connection with an Advanced Thermostat or Remote Control. The functionalities offered include:

• Control of domestic hot water temperature: Useful for R1K 25 boilers installed in less accessible locations.
• Adjustment of radiator temperature: An advanced Opentherm chronothermostat allows communication of the desired radiator temperatures to the boiler.
• Time scheduling for water heating: Beneficial for boilers with storage tanks, helping to reduce boiler maintenance costs, like gas.
• Error Resolution: Through Opentherm 2 or with devices 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

• Technical Manual for Radiant Boiler R1K 25