Condensing Boiler Radiant R1CR 24 Manual – Complete PDF Guide

In the condensing boiler Radiant R1CR 24, the water vapor in the flue gases is condensed to recover latent heat, significantly increasing energy efficiency compared to a standard boiler.

Unlike traditional boilers that dissipate part of the sensible heat to avoid corrosive condensation, condensing boilers exploit this heat for more efficient heating. Opting for a condensing boiler means not only benefiting from modest installation costs but also reducing energy consumption by up to 20%, especially when replacing an older system.

Annual Boiler Maintenance

Annual maintenance is indispensable to preserve the safety, efficiency, and reliability qualities of your device. This annual intervention prevents malfunctions and ensures the continuous safety of the system.

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 R1CR 24 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.

Check the Temperatures

On the Radiant R1CR 24 boiler, there are two knobs for adjusting the temperatures for domestic hot water and heating.

Pay attention to temperature settings:

• The heating temperature adjustment 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 in the secondary heat exchanger.

In general, we suggest setting the domestic hot water temperature to mix it with cold water as little as possible under the shower. This helps to prevent long-term limescale buildup.

Regarding heating, we suggest setting a temperature based on the season.

Cleaning Shower Head and Aerator Filters

We suggest regularly maintaining shower head and aerator filters, which over time can become clogged with limescale. With the progression of scaling, the aerators become difficult to remove, and there is also overheating of the hot water temperature causing the Radiant R1CR 24 boiler to frequently turn on and off. This is due to the wait for heat exchange between technical water and sanitary water.

Therefore, it’s good to have these accessories to replace as needed and frequently:

Boiler Settings for the Holidays

Before going on vacation, it is important to take some measures to ensure the safety of your Radiant R1CR 24 boiler. Even the most modern models can have problems if left inactive for an extended period.

Recommended steps:

• Close the water valve to avoid leaks during your absence.
• Disconnect the gas supply as an additional safety measure.
• Turn off the heat generator to conserve energy and improve safety.

When you return, reactivate these settings in reverse order. You may need to reset the heat generator to correct any errors.

These simple steps will ensure a worry-free vacation, knowing that your boiler is safe.

Innovation in Hot Water Production

The R2K rapid instant boiler is a technological masterpiece, equipped with a state-of-the-art flow meter to immediately detect the opening of the tap and meet the hot water demand. Capable of adjusting the temperature up to 38 degrees even at low flows, it ensures on-demand hot water, ideal for installations in high-rise buildings where water pressure is a challenge.

FAST-H2O Technology

The exclusive FAST-H2O technology, integrated into our system, uses a concentric coil to preheat the water within the exchanger, providing immediate hot water and reducing waste and waiting time. An intelligent system that ensures comfort and energy efficiency.

• Immediate response in hot water supply
• Maximizing comfort by reducing waiting times
• Reducing water waste and saving energy

To activate this function, press the and buttons on the Sanitary control panel.

The Electronics

About the electronics of this boiler, the board manufacturer is NORDGAS, to which Radiant has been relying for several years. The NORDGAS Board is cutting-edge regarding the essential systems of a modern boiler. It is worth mentioning the auto-reset system of the board’s memory every day, the air vent cycle that starts after filling the boiler just after the water shortage error, and the thermal shock control in heating. From Radiant about the board, we have an exceptional user interface with essential buttons for operation, all different from other boilers with numerous buttons. The error control is precise, and there are no difficulties in reading, technicians can finally receive precise error information via phone for an initial diagnosis.

Error Control

The R1CR 24 boiler reports all errors through a flashing code on the display, let’s remember the main ones:

• Error 01: No flame, this can happen 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 the technician.
• Error 03: Flue side thermal fuse tripped: The flue side thermal fuse has tripped, press the button, if it does not restart, call the technician
• Error 04: Lack of water in the system. Fill the system through the black cylindrical tap under the boiler, keep an eye on the pressure in the gauge above the display, when reaching the pressure of 1.2bar or 1.5bar remember to close the filling tap. The error resets itself, then the venting procedure will follow, lasting about 2 minutes, wait.

Notifications

These do not refer to errors but to functions currently in operation and are:

• F08 Anti-freeze heating function active: In case the boiler is outside and reaches a very low temperature, this procedure starts to prevent freezing of the technical water. Wait for the operation to complete
• F33 Plant Ventilation Cycle: Normally happens during the restoration of error E04, once the Radiant R1CR 24 boiler pressure is restored, the boiler performs this function lasting about 2 minutes. Wait for the operation to complete.
• FH Fast H20: The boiler is preparing for the preheating of sanitary water. Wait for the procedure to end

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.

Boiler Usage Warnings

To ensure the safety, efficiency, and performance of the R1CR 24 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.

Index of Components and Spare Parts

Use this section as an index to navigate through the different components and spare parts of the R1CR 24 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.

Temperature Adjustment

On the control panel of the Radiant R1CR 24 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 R1CR 24 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).

Boiler Filling Tap of R1CR 24

The filling tap is an essential component for maintaining optimal pressure inside the R1CR 24 boiler. This tap, usually located at the bottom of the boiler (as shown in the image), should be opened when the system’s pressure drops below 1 bar.

To refill the system, slowly open the tap until the pressure reaches the recommended level, usually around 1.5 bar. It is crucial to remember to close the tap after refilling to avoid overpressure that could damage the boiler or the system.

Innovative Technology of the Radiant Exchanger

The innovative patented Radiant exchanger stands out for its advanced plate technology, surpassing the limits of conventional exchangers. This system is designed for effective heating of sanitary hot water, maximizing performance and minimizing noise.

The design of this exchanger, specific to the R1CR 24 boiler, aims to provide uniform heating, significantly improving the component’s durability and ensuring optimal operation over time.

Nordgas MIAB 3000

The Nordgas MIAB 3000 board is an advanced and indispensable component for the R1CR 24 condensing boiler. This board manages the entire operational logic of the boiler, ensuring optimal control of heating functions and domestic hot water production.

Equipped with an integrated display and button panel, the MIAB 3000 board makes monitoring and adjusting the boiler settings easy and intuitive. Its cutting-edge design ensures a user-friendly interface, allowing users to easily interact with the boiler for efficient and personalized operation.

Efficiency of the Plate Heat Exchanger

The plate heat exchanger in the Radiant R1CR 24 boiler is designed to ensure optimal heating of domestic hot water. The innovative design allows for efficient thermal exchange between the water from the heating circuit and the water supply. Although these exchangers are designed to withstand flow variations, they can accumulate limescale over time, which can decrease the effectiveness of water heating. For this reason, we recommend regularly monitoring the state of the exchanger and proceeding with its replacement when necessary. The use of a polyphosphate doser and maintaining low temperatures for hot water are effective preventive measures against limescale formation, thus ensuring the long life and efficiency of the plate exchanger in your Radiant R1CR 24 boiler.

Energy Saving with the Modulating Pump for Boilers

The introduction of variable speed modulating pumps in modern boilers is a revolution in terms of energy saving and cost reduction. These pumps, regulated by an advanced electronic system through a second connector, are capable of varying their speed from 0 to 100% according to the real needs, maximizing the efficiency of the system. Their use, mandatory in new boilers, demonstrates a commitment to solutions that combine excellent performance with care for the environment and household economy.

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 R1CR 24 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 R1CR 24 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 R1CR 24 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 R1CR 24 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 R1CR 24 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 R1CR 24 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 R1CR 24 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 R1CR 24 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 use of the magnetic filter in the heating return line is a strategic choice to protect the boiler. This device uniquely captures and isolates both magnetic and non-magnetic debris that could otherwise accumulate and cause malfunctions. Keeping the filter clean and functional is essential to ensure maximum efficiency of the boiler and to prevent common issues such as temperature increase and excessive stress on the diverter valve.

Choosing a Polyphosphate Doser

For hard waters exceeding 20 French degrees, we recommend the use of a polyphosphate doser for the Radiant R1CR 24 boiler.

These devices mix polyphosphates, either in powder or liquid form, with the incoming water, minimizing limescale formation in the Radiant R1CR 24 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 Radiant R1CR 24 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 Radiant R1CR 24 boiler.

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.

Anomaly Reporting Codes for R1CR 24

Frequent Questions

To help you resolve doubts and questions about your Radiant R1CR 24 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 R1CR 24 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 R1CR 24 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

• Brochure for Radiant Boiler R1CR 24
• Technical Manual for Radiant Boiler R1CR 24