Transcript Slide 1

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:
Advantage
Disadvantage
Comments
Utilization of free heat
Wax
Low price
Slow reaction. Setpoint
moves over time.
Relatively short lifetime.
High hysteresis.
Old-fashioned
technology
Approx. 75%
Liquid
Stable setpoint.
Long lifetime.
Reacts with medium
speed.
Reacts on average
temperature.
Approx. 80%
Gas
Stable setpoint. Long
lifetime. Fast
Reaction.
Reacts on coldest spot
in room.
Approx. 85%
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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
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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 RA5062 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 pipework 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
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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
Use the following diagram to determine which
valve is required.
Angled
Start
Two Pipe
Straight
One Pipe
Angled
Straight
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Vertical
Code
3/8”=013G014100
½”=013G014900
¾”=013G014500
Code
3/8”=013G002100
½”=013G002300
¾”=013G002500
1”=013G002700
Code
3/8”=013G002200
½”=013G002400
¾”=013G002600
1”=013G002800
Code
½”=013G338300
¾”=013G338500
1”=013G338700
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.
Too cold!
If you remember in our example we
wanted an 11℃temperature loss
across our radiator?
Well by balancing, using a lockshield, we can ensure the most
efficient radiator temperatures.
Too hot!
Lock-shield valves are Danfoss
model: RLV
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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. nonthermostatic) 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
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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
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Thank
you for your time.
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