Sealed Chamber Boiler Euroterm SIMPLEX 20 S Manual – Complete Guide

The Euroterm SIMPLEX 20 S sealed boiler is a boiler in which balanced combustion is achieved through a fume fan, also known as an extractor. It has lower energy efficiency compared to a condensing boiler, however, all combustion is controlled inside an enclosure called the combustion chamber.

In fact, traditional boilers cannot exploit all sensible heat to avoid corrosion from condensation. The water vapor generated by the combustion process is then released into the atmosphere through the chimney, along with the associated latent heat.

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.

Essential Tips for Your Boiler in Winter

• Pressure Monitoring: Check your Euroterm SIMPLEX 20 S boiler’s pressure gauge to ensure correct pressure.
• Thermostat Batteries: Replace the batteries of the room thermostat to ensure maximum efficiency.
• Heating Pressure Check: Keep the heating system pressure between 1 and 1.5 bar for effective heating.
• Qualified Assistance: Entrust the maintenance and cleaning of your Euroterm SIMPLEX 20 S boiler to expert technicians.

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.

Suggested Temperatures

The Euroterm SIMPLEX 20 S boiler can always produce the temperature you want for heating according to your needs. You can adjust the temperatures via the control panel, but we suggest setting the hot water temperature (DHW) to the minimum necessary due to limescale and domestic hot water (DHW) considerations.

Attention to temperature settings:

• The heating temperature setting 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 inside the secondary heat exchanger.

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 Euroterm SIMPLEX 20 S boiler. Follow our guide to replace these components when necessary.

Getting Your Boiler Ready for Vacation

Before leaving for a vacation, it’s vital to ensure that your Euroterm SIMPLEX 20 S 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.

Boiler Safety and Maintenance

It is important to subject the SIMPLEX 20 S boiler to annual maintenance to ensure its efficiency and safety. Interventions on the boiler by unqualified people are strongly discouraged, as they can compromise the safety of the appliance. For any problem or anomaly, it is essential to turn to an expert technician. Remember that periodic maintenance by professionals is crucial for the longevity and safety 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.

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 SIMPLEX 20 S 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 SIMPLEX 20 S boiler: how to identify them, their specific function, and useful tips for maintenance and replacement.

Control Panel

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The control panel allows you to adjust the temperatures of the Euroterm Simplex 20 S boiler and provides an overview of the boiler’s fundamental parameters:

• Power Button : Enables you to start the boiler.
• Summer/Winter Button : Allows you to choose whether the boiler should only produce hot sanitary water or also provide heating.
• The two knobs allow you to:
  • Domestic Hot Water (DHW) Temperature Knob : Allows you to adjust the temperature of the hot sanitary water. We suggest a low temperature to prevent scaling in the heat exchanger.
  • Heating Temperature Knob : With this knob, you can adjust the temperature of the radiators.
• Thermometer : This component measures the primary temperature, so you will see it rise even in summer when the boiler is producing hot sanitary water.
• Hydrometer : Measures the system pressure; this needle should always be at 1.5 bar for correct operation.

The components behind the control panel are analog, consisting of a small relay board no longer in production. The knobs are connected to thermostats.

Features of the Giannoni Type F Diverter Valve

In the Euroterm SIMPLEX 20 S boiler, the Giannoni Type F Diverter Valve is essential for detecting and managing the flow of hot water. Sensitive to impurities like dirt and sludge, we recommend the use of a magnetic dirt separator filter for protection. Additionally, to ensure proper functionality under low water pressure conditions, it is important to keep aerators and showerheads clean.

Maintenance of the Primary Heat Exchanger

The copper primary heat exchanger of the Euroterm SIMPLEX 20 S boiler is essential for thermal efficiency. Its large surface ensures effective and consistent heat transfer.

The overtemperature sensor closely monitors the system, helping to prevent risk conditions such as overheating.

Pipe blockages are one of the most common causes of malfunctions. It is advisable to consider the use of a Magnetic Filter to protect the exchanger from such blockages and ensure its longevity.

CIMM CP387 Expansion Vessel for Boilers

The CIMM CP387 expansion vessel is designed to accurately regulate pressure in the Euroterm SIMPLEX 20 S boiler, with a durable design in red color and a standard 3/4-inch connection.

It is vital to perform periodic checks to maintain the efficiency of the expansion vessel, thereby preventing harmful pressure variations in the system.

Common problems include damage to the membrane and corrosion of the metal shell, which can negatively affect the operation of the heating system.

3/8 Automatic Air Purger

The 3/8 automatic air purger is a fundamental component in the Euroterm SIMPLEX 20 S 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.

Advanced Functionality of the Brahma TM 31 Board

The Brahma TM 31 Board, suitable for type C boilers, controls the entire combustion system. It offers double ignition and flame detection functionality, working in synergy with the air pressure switch. Its ignition phase begins by checking the status of the air pressure switch, followed by activating the extractor and the gas valve, leading to a stable ignition or a safety lockout.

Frequent issues include disturbances from the relays and defects in the extractor’s detection circuit.

Care of the Fume Extractor

The fume extractor is a key component in the boiler Euroterm SIMPLEX 20 S, responsible for expelling combustion fumes. Issues such as centrifuge blockage or abnormal noises can indicate the need for maintenance. Proper maintenance, performed by specialized technicians, includes cleaning of the air pressure switch and the centrifuge blades, thus ensuring the correct operation and longevity of the extractor.

Investing in regular care of the fume extractor is vital for maintaining the safety and efficiency of the boiler Euroterm SIMPLEX 20 S.

Grundfos UPS15/60 Boiler Circulator

The Grundfos UPS15/60 circulator is an optimal solution for water circulation in SIMPLEX 20 S boilers, ensuring efficiency and reliability. This model has three selectable speeds, with the highest speed recommended to maximize efficiency, unless there are noise disturbances from the circulating water.

Replacing this pump is usually a simple process for a qualified technician, although the stator can sometimes become stuck in the cast iron head after years of service, requiring special attention during removal.

Technical details of the UPS15/60 model:

• Capacity: 2.5 μF 230V – 50Hz IP44 TF 95
• Maximum Speed (III): 0.38 A – 85 W
• Medium Speed (II): 0.30 A – 65 W
• Low Speed (I): 0.21 A – 45 W

The UPS15/60 model is compatible for replacing various Grundfos motors, including UPS 15-50, 15-60, 25-50, 25-60, 15-65, 25-65.

Safety systems are fundamental components in the design and operation of boilers. They ensure the correct functioning of the device, preventing dangerous situations for users and the environment.

The SIMPLEX 20 S 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 Euroterm SIMPLEX 20 S boiler requires special attention to the proper cleaning of the flue pipe. Especially at the bends leading to the vertical section, dirt can accumulate, compromising the functionality of the smoke fan. 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 SIMPLEX 20 S 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 Euroterm SIMPLEX 20 S 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 Euroterm SIMPLEX 20 S 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 SIMPLEX 20 S 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.

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 Euroterm SIMPLEX 20 S 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 Euroterm SIMPLEX 20 S boiler and your home.

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.

Useful Tips and FAQ

We have gathered a series of useful tips and answers to the most frequent questions to help you maximize the efficiency and lifespan of your Euroterm SIMPLEX 20 S boiler. Find out everything you need to know for its best management.

The Water is Too Hot

If the water from your Euroterm SIMPLEX 20 S boiler is too hot, it may be due to reduced water flow, especially if you are on the upper floors of a building. Check that the tap filters and showerhead holes are clean. If the problem persists, consider cleaning the secondary exchanger or consult a plumber to evaluate the installation of a pressure booster system.

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