Radiant R1CR 28 User Manual – Condensing Boiler Instructions and Parts

The condensing boiler Radiant R1CR 28 is a boiler in which the water vapor in the flue gases condenses. This process allows for the recovery of latent heat of condensation, consequently offering higher energy efficiency compared to a traditional boiler.

In fact, traditional boilers use only part of the sensible heat of the combustion fumes because it is necessary to avoid the condensation of the fumes, which would lead to corrosive phenomena. The water vapor generated by the combustion process is thus dispersed into the atmosphere through the chimney, along with the associated latent heat. Gas heating based on condensation technology is always a good choice. In addition to modest efforts and relatively low installation costs, energy consumption is also reduced by 20% when replacing an old boiler.

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.

Annually or at the Start of the Winter Season

• Regularly check the pressure shown by the pressure gauge.
• Check the batteries of the room thermostat.
• Ensure that the heating system’s pressure is between 1 and 1.5 bar.
• Contact qualified personnel for maintenance and cleaning.

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 R1CR 28 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.

Regular Maintenance for Shower Heads and Shower Aerator Filters

Periodic maintenance of shower heads and aerator filters is essential to prevent limescale buildup. The obstruction caused by limescale makes it difficult to remove the aerators and affects water temperature, causing intermittent operation of the Radiant R1CR 28 boiler. Follow our guide to replace these components when necessary.

Boiler Safety During the Holidays

It’s crucial to take some precautions with your Radiant R1CR 28 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.

Energy Saving in Hot Water Production

Our R2K rapid instant boiler is designed with the environment in mind. Thanks to its sensitive flow meter, it accurately regulates hot water delivery, maintaining a constant temperature and reducing energy consumption, ideal for buildings with varying water pressure.

Sustainability with FAST-H2O

FAST-H2O, our eco-friendly technology, preheats the water in the exchanger, ensuring immediate delivery and reducing waste. This system not only improves user comfort but also contributes to more sustainable resource use.

• Instant and sustainable hot water delivery
• Improved comfort with less waiting and waste
• Contribution to energy saving and sustainability

To activate the FAST-H2O function, simply press the and buttons on the Sanitary control panel.

Intuitive User Interface

The R1CR 28 boiler stands out for its simple and intuitive user interface, thanks to the collaboration with NORDGAS. The Radiant control panel is designed to be easy to use, with clear buttons and a display that accurately reports errors, allowing for quick diagnosis and problem resolution.

Simple Error Diagnosis

Common errors like no flame, thermal fuse interruption, or lack of water in the system are clearly indicated on the display. This allows users to quickly identify the problem and take appropriate measures, such as reactivating the system or refilling the system. The boiler is also equipped with safety functions such as anti-freeze and preheating of sanitary water, to ensure optimal operation in all conditions.

• 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 28 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

Energy Efficiency and Quietness

Radiant 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.

Maintenance Tips

Regular maintenance of the R1CR 28 boiler is crucial to preserve its efficiency and safety. It is strongly advised against for inexperienced users to attempt any technical intervention on the boiler. Any doubts or anomalies in operation must be immediately reported to an expert technician. Annual maintenance, carried out by qualified technicians, is fundamental for the correct operation of the appliance.

Safety Regulations for Electric Energy

Safety in the use of the R1CR 28 boiler requires adherence to specific rules:

• Avoid contact with the appliance in the presence of moisture or while barefoot.
• Do not force or pull electrical cords, to prevent risks of short circuit or damage.
• Protect the appliance from atmospheric agents if not specifically indicated for outdoor use.
• In case of faults in the cord, stop using and rely on a specialized technician for repairs.

It is also important that any installation, initial ignition, and maintenance is carried out by qualified and authorized technicians to ensure proper functioning and compliance with the warranty. Use not in accordance with the instructions can be dangerous and invalidate the manufacturer’s liability.

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 R1CR 28 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 R1CR 28 boiler: how to identify them, their specific function, and useful tips for maintenance and replacement.

Temperature Adjustment

On the control panel of the Radiant R1CR 28 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 28 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 28

The filling tap is an essential component for maintaining optimal pressure inside the R1CR 28 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 28 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 28 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.

Plate Heat Exchanger for Domestic Hot Water

The plate heat exchanger is a fundamental component in the Radiant R1CR 28 boiler, designed to efficiently heat domestic hot water. Inside this exchanger, the technical water of the heating circuit and the cold water from the water supply cross in dedicated passages, allowing optimal thermal exchange that heats the domestic water. The advantages of the plate exchanger in the Radiant R1CR 28 boiler include its resistance to water flow reduction. However, it is important to underline that over time, the exchanger can develop limescale deposits. These deposits can lead to a slight cooling of the domestic hot water. To maintain the efficiency of the plate exchanger, it is recommended to replace the component in case of significant scaling, as cleaning with acid solutions is not always effective. Another preventive measure is the use of a polyphosphate doser and maintaining low operating temperatures for hot water, to minimize the risk of calcification.

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 R1CR 28 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 28 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 28 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 28 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 28 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 28 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 28 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.

Innovative Accessories

Enhance the functionality of your R1CR 28 boiler with these cutting-edge accessories:

• Advanced Programmable Thermostat: Control the temperature of your home with intelligent solutions that offer flexible programming and interactivity.
• Magnetic Filter Dirt Separator: An indispensable accessory for maintaining the efficiency and cleanliness of your boiler’s hydraulic circuit.

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.

Maintenance of the Polyphosphate Doser

If the tap water hardness exceeds 20 French degrees, a polyphosphate doser is recommended for the Radiant R1CR 28 boiler.

The polyphosphate doser, which can use powder or liquid additives, is vital for reducing limescale in the Radiant R1CR 28 boiler. These additives require constant replenishment to ensure maximum effectiveness.

Available in different variants, polyphosphates include:

• Powder Polyphosphates
• Liquid Polyphosphates

The choice of polyphosphate determines the type of mixing mechanism required.

Thermostat and Programmable Thermostat

Maximize comfort and efficiency of your Radiant R1CR 28 boiler by installing a room thermostat or programmable thermostat.

These smart devices allow you to customize your home’s temperature, ensuring a pleasant environment and reducing energy consumption. Particularly, programmable thermostats allow you to set different temperature settings for each day of the week or specific times of the day.

Available models include:

• Daily Programmable Thermostats
• Weekly Programmable Thermostats
• Smart Thermostats with Remote Control

Choose the model that best meets the needs of your home and your Radiant R1CR 28 boiler.

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.

Anomaly Reporting Codes for R1CR 28

FAQ

Discover the answers to the most frequent questions about the Radiant R1CR 28 boiler model. This quick guide has been compiled to provide clear and direct information based on the common questions from our users.

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 28 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 equipped with non-powered thermostatic connections, compatible with Smart Thermostats or Remote Controls. This allows the use of advanced functions such as:

• Adjusting the domestic hot water temperature: Ideal for R1CR 28 boilers installed in hard-to-reach areas.
• Adjusting the radiator temperature: With the Opentherm chronothermostat, it is possible to adjust the radiator temperatures directly from the boiler.
• Setting operating times for domestic hot water: A feature that helps to reduce the maintenance costs of the boiler for models with storage tanks.
• Fault Management: Using the Opentherm 2 protocol or 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

• Brochure for Radiant Boiler R1CR 28
• Technical Manual for Radiant Boiler R1CR 28