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Introduction. Danfoss Training Module-1 * * * * * * Understanding Thermostatic Radiator Valves for Commercial Heating Systems. Back. Back. Next. Next. Introduction. Hello and welcome to the Danfoss training module 1 ‘Understanding Thermostatic Radiator Valves for

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Introduction

Danfoss Training Module-1

* * * * * *

Understanding Thermostatic Radiator Valves

for Commercial Heating Systems

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Introduction

Hello and welcome to the Danfoss training module 1

‘Understanding Thermostatic Radiator Valves for

Commercial heating systems.’

The purpose of this training module is to give you the knowledge required to select, specify, and understand Danfoss products.

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Introduction

We will examine the benefits, operation, and selection of Thermostatic Radiator Valves.

We also want to give you an understanding of the systems they are part of.

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Introduction

This module takes around 20 minutes and forms part of a ‘Continuous Professional Development’ training course.

Once 3 modules are complete you can apply to Danfoss for a certificate of your achievement.

Now let us begin….

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The History of Danfoss

1933

1943

1952

2010

Mads Clausen establishes his company Dansk Køleautomatik – og Apparat Fabrik, and began by producing expansion valves for refrigeration plant

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The History of Danfoss

1933

1943

1952

2010

In 1943 Mads Clausen invented the very first radiator thermostat and in 1952 production began of the RA type radiator thermostat.

1943

1952

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The History of Danfoss

1933

1943

1952

2010

The Danfoss Group is a global producer of components and solutions for Refrigeration &Air Conditioning, Heating & Water, and Motion Controls.

Danfoss employs approx. 22,000 people worldwide and produces more than 250,000 items daily, in more than 50 factories located in 20 countries.

This includes a factory based in Bedford, UK which makes Electronic Room Controls.

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The History of Danfoss

1933

1943

1952

2010

Danfoss thermostats have been leading the market ever since Mads Clausen invented the first TRV…

…and radiator thermostats are still a core business for Danfoss

to this very day.

By selecting Danfoss products you have over 75 years of

expertise behind you.

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What is a Thermostatic Radiator Valve?

A thermostatic radiator valve is a control device

for individual radiators.

They use a thermostatic sensor to control the

water flow.

TRV’s consist of two parts…a valve... and a sensor.

The valve is connected between the pipe-work

and the radiator…

and the sensor sits on top of the valve.

Danfoss has the widest range of radiator valves

on the market…

…and aim to cover all applications.

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What is the benefits of using Radiator Thermostats?

Thermostatic radiator valves control the temperature on each radiator throughout a building.

This means than each room is individually controlled to give the required temperature for its use.

By keeping each room at the correct temperature

we improve comfort for it’s occupants.

Danfoss Thermostatic Radiator valves also save energy….

and we have lots more on this later in the module.

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How do Commercial TRV’s Operate?

The valve has a stem and a cone which are moved by the sensor to control flow.

The sensor is filled with gas and as the room temperature rises the gas expands .

This pushes the valve stem down to reduce flow.

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How do Commercial TRV’s Operate?

The temperature is set in the sensor using numbers which correspond to temperatures. For example

setting the sensor to number 3 gives a room temperature of 20 ℃.

As the room temperature falls the sensor allows the valve stem to move up.

This increases flow and temperature to the room.

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How do Commercial TRV’s Operate?

Danfoss RA sensors are unique in that they are the only sensors on the market which are gas filled.

Gas filled sensors react quicker to changes in temperature in the room.

This reduces overheating and utilises more ‘free heat’.

All other manufacturers offer only liquid or wax filled heads.

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How Gas Filled Sensors Compare with Liquid Filled

By using RA sensors the user will have a more comfortable room temperature…

…and the system will use less energy.

Summary of Different Media Types:

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Selecting the correct sensor

The basic knowledge this module can give you will make selecting the correct sensor a simple process.

Let us talk you through it….

Sensors for Commercial systems come in four main types…

RA-2910

Built-in Sensor

RA-2912

Remote Sensor

RA-2920

Tamperproof Sensor

RA 5062

Remote Adjuster Sensor

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Selecting the correct sensor

Danfoss RA-2910

The Built-in Sensor is the most commonly used sensor for commercial systems, such as offices, in the UK.

This sensor features a locking and limiting function to prevent the temperature being turned up too high.

It is connected to the valve using a small allen key connection, this makes it hard to remove by un-authorised users.

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Selecting the correct sensor

Danfoss RA-2020

Tamperproof Sensor used in public buildings and spaces, such as council offices, doctor surgeries and libraries.

The sensor is set and locked by the installer to keep a specific temperature. The tamperproof lock means no un-authorised persons can change the temperature.

The Danfoss RA2020 tamperproof

sensor is recognisable as having a

grey shroud at its base.

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Selecting the correct sensor

Danfoss RA-2912

Low Surface Temperature Radiators are commonly used in care homes, where the radiator and valve are boxed in to prevent people from scalding themselves.

In this situation, the temperature sensed using a standard head would be artificially high.

To prevent this incorrect temperature reading, the Danfoss RA2912 sensor

is connect to the valve by a 2 metre Capillary Tube. This can be placed

to sense the correct room

temperature without giving access

to the valve or pipework.

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Selecting the correct sensor

Danfoss RA-5062, RA-5065, and RA-5068.

Remote Adjuster Thermostats are used where the valve is completely boxed in, and mostly installed on Radiant Panels.

Radiant panels are often used in schools.

The sensor is a thermostat which has a capillary tube connecting it to the valve, allowing the temperature to be set remotely.

The last digit in the name indicates the length of the capillary tube, i.e. the RA-5062 has a 2 metre tube.

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Selecting the correct valve

To select the correct valve the information required is as follows:

-The valve size

-The angle pattern of the valve

-The pipe-work configuration

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Selecting the correct valve

Valves sizes: 3/8”, ½”, 3/4”, and 1”.

Danfoss valves are suitable for iron pipe-work or copper pipe-work using fittings.

Each valve size is selected based upon

the radiator capacity.

A sizing chart is used to select the

correct valve.

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Selecting the correct valve

For a 2000W or 2Kw Radiator using a

temperature loss across the radiator

of 11℃…we would draw a red line.

Allowing a valve pressure loss of 10 kPa

(also described as 0.1 Bar) we would

draw a green line.

The two lines meet in the chart area for

DN15 valves (blue lines).

We therefore require a ½” valve.

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Selecting the correct valve

  • Two types of pipe configuration exist for radiator systems:

  • one pipe systems…

  • two pipe systems…

  • Different types of valves are used on the two different configurations.

2-Pipe System

1-Pipe System

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Selecting the correct valve

A two pipe system is where the flow and return pipes are separate.

The flow is attached to one connection on the radiator, and the return the other.

This gives a parallel connection between the flow and return pipes.

For two pipe systems Danfoss offer RA-FN type valves. These require a lower flow capacity than one-pipe valves.

Two-pipe systems are energy efficient and provide better temperature control to radiator systems.

2-Pipe System

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Selecting the correct valve

A one-pipe system is where both radiator connections are attached to the

same pipe run. Giving the radiators a series type configuration.

For one-pipe systems Danfoss offer the high capacity RA-G type valves.

Danfoss are one of few radiator valve manufacturers who still offer valves

for one-pipe systems.

This is because the Danfoss RA valves and sensors installed in one-pipe sensors are beginning to need replaced…

…30-40 years after they were installed!!

1-Pipe System

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Selecting the correct valve

Both the RA-G and RA-FN valves come in either angled or straight patterns.

This refers to the direction the water flows through the valve.

The angled valve feeds the water in and out of the radiator at a 90 ° angle.

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Selecting the correct valve

The RA-FN angled valves are available with either a horizontal or vertical mounting sensor.

A horizontal sensor is mounted away from the heat provided by the radiator which ensures we are measuring room temperature and not radiator temperature.

Vertical sensors sit closer to the radiator. This makes them able to fit in confined spaces.

Danfoss recommend the use of horizontal angled valves where possible.

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Selecting the correct valve

Straight pattern valves feed the water in and out of the radiator in a straight line.

By having different patterns we can give installers as many options as possible to ensure neat and easy valve connection.

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Selecting the correct valve

Horizontal

Code

3/8”=013G014100

½”=013G014900

¾”=013G014500

Use the following diagram to determine which valve is required.

Vertical

Code

3/8”=013G002100

½”=013G002300

¾”=013G002500

1”=013G002700

Angled

Start

Two Pipe

Straight

Code

3/8”=013G002200

½”=013G002400

¾”=013G002600

1”=013G002800

One Pipe

Angled

Code

½”=013G338300

¾”=013G338500

1”=013G338700

Straight

Code

½”=013G338400

¾”=013G338600

1”=013G338800

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Selecting the correct valve

To get our Danfoss Randall Valve Selection Chart,

you can either call us on: 0845 1217 400 and ask for literature

You can also call us and speak to our technical helpdesk, they would be able to help you determine which valve you need.

Or you can send us a request via our website:

www.danfoss-randall.co.uk / service & support / How to contact us, select the ‘literature request’ at the bottom of the page.

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Radiator Balancing

Lock-Shield valve.

The Lock Shield valve is used to isolate and balance a radiator, and is located on the return pipe connection.

RLV Lock-shield Valve

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Radiator Balancing

Lock-Shield valve.

By turning the lock-shield valve down with an allen key, the maximum flow is reduced, hence balancing the radiator.

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Radiator Balancing

By balancing the radiators they all get the correct temperature…

thus preventing the first radiator in the system getting too much heat, and the last radiators getting too little heat.

If you remember in our example we wanted an 11℃temperature loss across our radiator?

Well by balancing, using a lock-shield, we can ensure the most efficient radiator temperatures.

Lock-shield valves are Danfoss model: RLV

Too cold!

Too hot!

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Drain-cock adapter

Danfoss lock-shield valves have an optional drain-cock adapter to drain the radiator system with.

This drain-cock adapter is Danfoss code: 003L015200

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Saving Energy

Now we have chosen the radiator valves to give maximum comfort

to our users…

…let us see how Danfoss Thermostatic Radiator Valves can save energy!

Danfoss have studied the energy used when manual radiator valves are

replaced with thermostatic radiator valves.

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Saving Energy

When using a manual (i.e. non-thermostatic) radiator valve, the flow to the radiator is fixed manually (by hand).

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Saving Energy

By using a Thermostatic Radiator Valve, the flow of water varies, based upon the room temperature.

This means the sensor reacts to the changes in that room temperature, caused by external factors such as the sun.

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Saving Energy

By using a Thermostatic Radiator Valve to reduce flow,

as the room temperature increases, we save energy.

Danfoss have found that by using a thermostatic

radiator valve instead of a manual radiator valve,

minimum energy savings of 20% can be achieved.

Energy saving is not just about saving the planet, it’s also about saving money on our heating bills!

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Final Review

You have now completed the Danfoss Training Module

‘Understanding Thermostatic Radiators Valves for

Commercial Applications.’

I’d just like to highlight some key points before we finish.

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Final Review

Thermostatic radiator valves are designed to save energy and provide comfort to users.

Valves are designed for use in 1 or 2 pipe configurations.

We use RA-FN valve for 2-pipe applications…

and RA-G valves for 1-pipe applications.

As the room temperature changes, the sensor reacts to keep our

set temperature.

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Final Review

Danfoss offer four types of sensors:

RA-2910

Built-in Sensor

RA-2912

Remote Sensor

RA-2920

Tamperproof Sensor

RA 5062

Remote Adjuster Sensor

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Final Review

Gas filled sensors react faster than

liquid filled heads,

this saves energy by using more ‘free-heat.’

Thermostatic valves are available in angled or straight pattern.

Danfoss valves are available in 3/8”, ½”, ¾”

and 1” sizes.

They can be used on either copper or iron pipe-work.

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Final Review

To balance our radiators we need an

RLV lock-shield valve.

By using thermostatic valves in place of manual valves

we can save a minimum of 20% of the systems energy.

By using Danfoss you will have all radiator applications covered.

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Final Review

Congratulations for completing your first training module!

You now have all the information required to select

and specify Danfoss thermostatic radiator valves.

Module 2 has a title of ‘Balancing Valves for Heating and Cooling Systems’

Once you have completed three modules you

can apply to Danfoss Randall for your

‘Continuous Professional Development’ Certificate.

For more information on Danfoss products or

for Danfoss-Randall’s contact details please visit our

website at:

www.danfoss-randall.co.uk

Thank you for your time.

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