Boiler Guide Radiant R1K 75 – Operational and Maintenance Manual

The Radiant R1K 75 condensing boiler is a condensing boiler for heating only. It uses condensing technology to recover heat from the flue gases and achieve higher efficiencies, therefore requiring a discharge due to the high production of condensate.

This boiler is specific for heating only production.

Common Procedures

To maintain the safety, efficiency, reliability, and performance characteristics that distinguish the device, it is necessary to perform maintenance annually. Annual maintenance is essential for safety and continuity of operation.

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 Radiant R1K 75 boiler.

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.

Boiler Temperature Management

Optimize the performance of your Radiant R1K 75 boiler by correctly adjusting the heating temperature. Heating control through the control panel is crucial for energy efficiency.

Details on Temperature Adjustment:

• Heating Temperature Adjustment: Refers to the radiator temperature, not the ambient temperature.

Getting Your Boiler Ready for Vacation

Before leaving for a vacation, it’s vital to ensure that your Radiant R1K 75 boiler is ready and safe. This is important even for the most advanced boiler models.

Recommended procedure:

• Stop the hot water supply to prevent leaks.
• Shut off the gas supply as a safety precaution.
• Deactivate the heat generator to avoid wasting energy and increase safety.

Upon your return, restore the functions in reverse order. You may need to restart the heat generator to resolve errors related to the prolonged shutdown.

By following these steps, you can relax on vacation knowing that your boiler is in a safe state.

Maintenance and Assistance Made Easy

The R1K 75 boiler makes maintenance a straightforward process. The user interface, developed in collaboration with NORDGAS, allows for quick identification of any issue thanks to a well-structured error reporting system. The boiler is designed to facilitate daily maintenance operations and remote diagnosis.

Easy Diagnosis and Error Resolution

Common problems like no flame, thermal fuse interruption, or lack of water are easily identifiable thanks to clear error codes displayed on the panel. This enables a quick response and, if necessary, efficient technical intervention. Additionally, features such as the anti-freeze and the FAST-H2O system ensure stable operation and reduce the frequency of maintenance.

• 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 75 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.

Noise and Consumption

Lastly, regarding noise and performance in gas and electricity consumption. Radiant has designed this series of boilers to be particularly quiet, operating as silently as a whisper (about 55 decibels). The quietness is thanks to the MOPLEX muffler at the air inlet to the fan, as well as the soft panel glued to the front panel that perfectly seals the combustion chamber. The result is a very quiet boiler. Regarding gas consumption, we have a very low rate thanks to the 9 flame modulations and proportional temperature control. Electricity consumption is also low, thanks to the use of a modulating WILO circulator and a careful strategy of turning off non-essential devices in standby mode.

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 75 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.

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 R1K 75 boiler: how to identify them, their specific function, and useful tips for maintenance and replacement.

Temperature Control

Take advantage of the control panel of your Radiant R1K 75 condensing boiler for precise temperature control. Easily set the desired heat using the + and – buttons near the Radiator symbol. The boiler will briefly show the set temperature, then return to displaying the primary exchanger temperature.

The displayed temperature is the outgoing water temperature, which in winter indicates the real temperature of your radiators.

Using the + and – buttons, you can adjust the heat to your liking. Here are some recommendations:

• Set between 25°C and 38°C for floor heating systems.
• Adjust between 55°C and 65°C for aluminum or steel radiators.
• Select 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 75 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 75 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 75 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 75 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 75 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 75 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 75 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 75 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 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.

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: Simplicity and Efficiency

For easy and intuitive home temperature control, the daily environmental thermostat is the perfect solution.

Suitable for those who prefer immediate and uncomplicated regulation, this device allows for easy temperature setting for each day, adapting to various routines. Ideal for seniors and for those who want to comply with energy efficiency regulations.

• Intuitive interface and easy programming
• Suitable for complying with energy regulations
• Cost-effective option with high practicality

An excellent choice for those seeking a balance between simplicity of use and compliance with energy regulations, without sacrificing savings.

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 75

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 75 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 75 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 R1K 75 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

• Technical Manual for Radiant Boiler R1K 75