Post on 01-Apr-2018
2
INDIVIDUAL TEMPERATURE REGULATION IN
ROOMS WITH UNDERFLOOR HEATING 4
BASIC ELEMENTS FOR REGULATION
OF AN UNDERFLOOR HEATING SYSTEM 8
FLOOR CONSTRUCTIONS 12
COMBINED HEATING SYSTEMS 16
REGULATION METHODS USING
DANFOSS CONTROL SYSTEMS 18
EXAMPLES OF USE 22
PRODUCT CATALOGUE 26
Flexibility
Less energy
Optimal temperature
More comfort
Perfect control
3
Preface
In recent years, underfloor heating has become
increasingly popular. This is due to the fact that
underfloor heating provides a range of opportun-
ities not offered by traditional heating methods –
in both residential and commercial buildings.
However, it is essential to regulate underfloor
heating correctly in order to make the very most
of the opportunities it provides. That is why
Danfoss has developed a versatile range of
controls that pave the way to energy savings and
optimal comfort.
This guide contains a general introduction to
setting up underfloor heating systems. It also
provides an explanation of why the option of
regulating temperature individually in the
separate rooms is so important to the optimal
utilisation of underfloor heating. Finally, the last
section of this guide contains a list of the
products in the Danfoss range for regulating
underfloor heating systems as well as a number
of examples of use.
We hope you find this guide useful.
Danfoss A/S
Individualtemperature in
each room
4
Individual temperature regulation in rooms withunderfloor heating
Activities and clothing vary from
room to room, which is why the
temperature should be adjusted
accordingly.
Typical room temperatures in a
residential building
Kitchen ~ 20 ºC
Living room ~ 20 ºC
Bathroom ~ 23 ºC
Bedroom ~ 17 ºC
Hall ~ 17 ºC
Comfort
The temperatures in the rooms in which we live
and work play an important role in our well-
being. It should not be too hot or too cold, and
the temperature must be adjusted in relation to
what we are wearing and what we are doing at
the time. For example, office workers typically
wear lighter clothes and have a lower body tem-
perature than personnel packing products in the
warehouse. The room temperature should there-
fore be higher in the areas where office workers
carry out their tasks.
Room temperature can be regulated in a number
of ways. One of the most commonly used methods
involves regulating the supply temperature to
the heat emitters – such as underfloor heating
systems, radiators and convection heaters. This
can be done using self-acting regulation
valves with fixed temperature settings. Electronic
regulators, which take into account the tempera-
ture outside can also be used. These methods
can be made even more efficient by the installa-
5
tion of a reference sensor in the room you wish
to use as the basis for regulating the supply tem-
perature.
The use of such methods allows some degree of
regulation, but it does not make it possible to
regulate temperature precisely or individually in
different rooms. Even if the same temperature is
required in all rooms, these methods are still not
the best options. This is because they do not
allow for corrections to be made to accommod-
ate the special conditions of the different rooms –
conditions such as user patterns, heat loss and
heat supply from PCs and sunlight through
windows, for example. This means that if regula-
tion of the supply temperature is the only method
used, a suitable temperature can be obtained in
some rooms, but not in others. Some rooms will
be too hot – which is not only unpleasant, but
also results in excessive energy consumption –
while others will be too cold.
In short, it is essential to be able to regulate the
temperature individually in the separate rooms to
make sure that they are all pleasant to be in, and
to save energy.
By regulating the temperature individually in the
separate rooms, it is possible to ensure that all
areas of the building are pleasant to be in as the
temperature suits the activities in each room.
This applies to both private and commercial
buildings and offers the dual benefits of optimal
comfort and minimal energy consumption.
Individual room temperature regulation ensures optimal comfortin all rooms.
6
Independent tests and simulations have been
carried out with the purpose of establishing the
importance of regulating temperature in individ-
ual rooms for people's comfort and for energy
consumption. The results vary, depending on the
house/apartment in question, its construction
and user patterns, as well as on the test method
used. However, the results are all clear on one
point – namely, they generally support the
importance of individual room temperature regu-
lation for both comfort and energy consumption.
It has been shown that energy savings of
20-40% can be made without compromising
on comfort.
Energy consumption and energy savings
The ultimate goal of temperature regulation is to
ensure maximum comfort combined with minimal
energy consumption. This means that the
heating system must constantly ensure that the
temperature is always suitable in the different
rooms, without noticeable variations. There are a
range of factors that must be taken into account,
such as the activities and clothing of the people
in the room, heat loss and heat gain through
windows, lights, computers and other sources of
heat. As a minimum, the temperature must be
regulated individually in the separate rooms or
zones.
Temperature distribution in aroom with underfloor heating.
•·································20°C
3 6 9 12 15 18 21 24
20
23
17
°C temperature
Hour (1 day)
Bathroom
Living room
Bedroom
Temperature achieved with individual room temperature regulation.
Temperature achieved without individual room temperature regulation.
Desired temperature
Desired temperature
Desired temperature
• Approximately 70% of the heat supplied by
underfloor heating is radiated heat, a form of
heating that suits people very well.
• The heating surface covers the entire floor, thus
ensuring even distribution of the heat.
• Heat loss through windows, walls and ceilings is
kept to a minimum because the underfloor
heating ensures an uniform temperature
throughout the room.
• Underfloor heating can be connected to a range
of heating sources – such as boilers, direct
district heating, district heating with heat
exchangers, solar heating and heat pumps.
Heat deviations
In all rooms, the temperature will vary from floor
to ceiling and from one end to the other. It is
important to personal well-being that these
temperature variations are minimal. In the worst
cases, major variations can lead to draughts.
By definition, underfloor heating has a large
surface for radiating heat, and so heating
requirements can be covered with only a very low
surface temperature on the floor. Underfloor
heating also makes it possible to achieve the
same temperature in all areas of the room from
the horizontal perspective. In addition, it is
possible to make sure that the difference in
temperature between floor and ceiling is typically
only 1-2 ºC (see the illustration on the previous
page).
7
8
Basic elements for regulation ofan underfloor heating system
1
2
3
4
M1
DN15PN10KV 1
M1
DN15PN10KV 1
AMV 100
M1
DN15PN10KV 1
M1
DN15PN10KV 1
AMV 100
Underfloor heating systems can be built up in a
range of ways. The illustrations below show four
typical examples of underfloor heating systems.
The systems and the components they contain
are described in more detail on the following
pages.
Heat sources
In examples 1 and 3, the heat source consists of
a boiler, while in examples 2 and 4, the heat
source is direct district heating.
The underfloor heating systems are low-tempera-
ture systems with a typical supply temperature of
30-45 °C. This means that they can be supplied
from other sources of heat such as solar heat,
heat pumps and the like.
The heat source and mixing loop can be
controlled using various types of electronic and
self-acting regulators.
In examples 3 and 4, an electronic weather
compensator (ECL) is used, while in examples 1
and 2 a self-acting flow temperature regulator
(FTC) is used to control the supply temperature.
Mixing loop
We recommend always using a mixing loop in
connection with underfloor heating as today, this
is the best way to ensure a correct and stable
supply temperature, irrespective of the heat
source used.
In example 3, a weather compensator (ECL) is
used. This regulates the supply temperature by
changing the position of the 3-way valve in the
mixing loop. This electronic regulator also con-
trols the circulation pump and starts/stops the
boiler according to heating requirements. There
are benefits to be gained by replacing the 3-way
valve with a 2-way valve on the return pipe as
shown in example 4, where the supply comes
simply from direct district heating. When using
direct district heating, it is important to fit a
differential pressure regulator ∆p (AVPL) over the
valve so that the valve works at a constant
differential pressure within the regulation range.
A number of different parameters can be chosen
for regulation – outdoor temperature, room
temperature or return temperature, for example
– depending on the type of weather compensator
(ECL) used. A weather compensator is a propor-
tional-integral (PI) regulator. This means that it
will always set itself to the desired supply tempe-
rature.
The illustrations refer to the overview on page 32.
9
In examples 1 and 2, a self-acting regulator
(FTC) is used to regulate the supply temperatu-
re. A self-acting regulator is a proportional (P)
regulator. This means that it will always regulate
with a small deviation. The scale is divided into
ºC to make it simple to set and adjust the regu-
lator. In the same way as electronic regulators
(ECL), self-acting regulators (FTC) ensure the
correct mix so that the desired supply tempera-
ture to the underfloor heating system always
remains constant, irrespective of load.
In example 2, a differential pressure regulator
∆p (AVPL) has also been fitted. This makes sure
that the differential pressure across the self-
acting regulation valve (RA-C/RA-N) remains
constant and within the regulation range.
The choice of self-acting and electronic regulators
depends on the user's needs and requirements to
the system. Electronic regulators are very flexible
regarding connections and settings, thus they are
generally more expensive to buy and to install.
Some countries have legal requirements concer-
ning the use of weather compensators for the
regulation of the supply temperature in heating
installations.
Mixing pumps (P2) are available as variable
pressure pumps (example 4) and constant
pressure pumps (examples 1, 2 and 3).
The advantage of variable pressure pumps
(example 4) is that they ensure optimal flow and
constant differential pressure. They maintain a
constant differential pressure internally and thus
also over the valves in the manifold (CFD) of the
underfloor heating system irrespective of how
many of the valves are open or closed. This is a
considerable advantage because the individual
pre-settings on the manifold valves – which
ensure the flow distribution between the different
underfloor heating circuits – are based precisely
on a constant differential pressure.
It is important to pre-set the manifold valves so
that the heat is distributed evenly to the different
rooms with underfloor heating. Variable pressure
pumps always deliver precisely the flow needed
thus reducing power consumption, and, as a
result, electricity costs.
Constant pressure pumps (examples 1, 2 and 3)
can also be used to ensure a constant differen-
tial pressure over the manifold valves to the circu-
its of the underfloor heating system if an auto-
matic bypass valve (AVDO) is fitted. When the
valves in the manifold (CFD) close, the automa-
tic bypass valve (AVDO) will open more and more
because the pressure rises when the flow through
the system falls. The pump must always be able
to cover the total flow, and therefore provides the
same output irrespective of how many valves are
open in the manifold (CFD). This means that
power consumption remains constant when
pumps of this kind are used.
10
Manifold: the underfloor heating pipes, which are
cast into the floor, are individually connected to a
valve on the manifold or distributor (CFD), which
regulates the water flow in each separate under-
floor heating circuit. The size of the manifold
chosen depends on the number of circuits used in
the installation. The manifold typically consists of
a return pipe with valves and a supply pipe. The
pre-setting can be located on either the supply
pipe or the return pipe, and both can be fitted
with end sections including draining, filling, and
air vent functions.
For underfloor heating systems with a pipe dia-
meter of 15-20 mm, it is recommended to lay a
new pipe circuit connected to a separate manifold
valve for every 25-30 m2 in large rooms. This is
to prevent excessive pressure loss and cooling in
the separate circuits. The pipes must be distribu-
ted evenly throughout the room, with each cove-
ring a similar share of the total area. For smaller
pipe diameters, the area covered by each pipe
will naturally decrease.
Thermal actuator: a thermal actuator is fitted to
each manifold valve. This opens and closes the
valve according to the heating requirement. The
actuator is controlled by a room thermostat (CFR
or FH-WT/S/P) set to the desired room tempera-
ture. In principle, this works in the same way as
a radiator thermostat, the only difference being
that in this case, all the valves are collec-
ted together in the manifold (CFD) and the
sensors in the separate rooms. If there are
several underfloor heating circuits in a room, the
room thermostat (CFR or FH-WT/S/P) can
control several outputs with associated thermal
actuators (TWA).
Pre-setting and calculating flow: the pre-setting
of the manifold (CFD), which takes care of distri-
buting the flow between the underfloor heating
circuits in the separate rooms, has an important
role to play for both comfort and the efficiency of
the regulation itself. The longest circuit demands
the greatest flow, and its pre-set position must
therefore be completely open.
Underfloor heating systems
Danfoss has a wide range of functional and effici-
ent products for regulating room temperatures in
underfloor heating systems. These include both
electronic and self-acting regulation systems. The
electronic regulation systems are available as both
wireless and hard-wired systems.
Wireless regulation system: in wireless systems
(CF-system) the thermal actuators (TWA) are
connected to the outputs on what is known as a
master regulator (CFM). Here, it is possible to
choose which output or outputs are to be regula-
ted by the different room thermostats (CFR).
When a room thermostat (CFR) "calls for" heat, a
radio signal is sent to the master regulator
(CFM), which activates the appropriate output.
A thermal actuator (TWA) then opens the associ-
ated manifold valve for the room in question. This
allows the room temperatures in the separate
rooms to be regulated individually.
Hard-wired regulation system: in principle,
traditional, hard-wired systems operate in the
same way as wireless systems. The difference is
that in these systems, the regulation is per-
formed by room thermostats (FH-WT/S/P) that acti-
vate the thermal actuators (TWA) directly on the
manifold valves. The wires from the room thermo-
stats (FH-WT/S/P) and the thermal actuators
(TWA) are connected in a connection box (FH-
WC) where it is also possible to connect a relay
(FH-WR) to the boiler or pump control and a
timer. It is also possible to use room thermostats
(FH-WS/P) and a floor sensor (FH-WF) to regula-
te the surface temperature of the floor.
Self-acting regulation system: self-acting
systems (FHV), which are designed to be built
into walls, are often used to regulate underfloor
heating in a single room – such as a bathroom or
utility room. Regulation can be carried out on the
basis of the room temperature or the return tem-
perature from the underfloor heating circuit,
depending on whether you would like a constant
temperature in the room or a constant surface
temperature on the floor.
11
Calculation of the flow (Q) in underfloor heating
circuits:
Q =
Heat
demand: value that states how much energy that
needs to be used in a room to maintain
a specific temperature. The value also
provides an indication of the ability of
the room to retain the heat supplied.
This depends on factors such as how
well the room is insulated. This value is
typically between 35 and 50 W/m2 for a
well-insulated building.
Room area: the size of the room in m2.
∆T: cooling over the underfloor heating
circuit – typically 5 ºC in residential
buildings.
*1.16 Conversion factor.
In the following section, we will examine an example
involving an installation covering four rooms of 25, 18,
12 and 7 m2. The heating demand has been set at 40
W/m2 and cooling at 5°C.
The first step is to calculate the flow to the largest room
(25 m2):
Q25 = = 172 l/h
Next, we calculate the flows to the other rooms:
Q18 = = 124 l/h,
Q12 = = 83 l/h and
Q7 = = 48 l/h
The calculated values for Q and the applicable differential
pressure are then entered into the capacity diagram for
the manifold (CFD) to find the pre-setting values.
Heat demand x room area
∆T x 1,16*
40 x 25
5 x 1,16
40 x 18
5 x 1,16
40 x 12
5 x 1,16
40 x 7
5 x 1,16
System not in balance.
System in balance.
12
When designing the floor, it is important to take
into account a range of factors that affect the
efficiency and comfort level of the underfloor
heating system. These include level of insulation,
layout pattern, pipe dimension, distance between
the pipes, installation depth and cooling over the
circuits. The surface temperature must be evenly
distributed over the entire floor area to ensure
optimal comfort.
Layout patterns
The choice of layout pattern depends on the
chosen method of regulation – electronic (On/Off
or timed pulse modulation) or self-acting
(P-regulator).
b) Double parallel pattern.
a) Double parallel spiral pattern.
There are three typical layout patterns:
The double parallel spiral pattern (figure a) can
be laid from the middle outwards or from the
point where the pipes enter the room. The supply
and return pipes are laid at the same time. The
supply pipe should be the one closest to the
exterior wall. The pipes are laid parallel to the
walls and with the same length proportions. This
pattern provides optimal distribution of the heat
across the floor as the supply and return pipes lie
side by side. This pattern should always be used
for systems with self-acting regulators, where the
flow varies depending on the deviation in tempe-
rature. The pattern is also ideal for systems
involving electronic regulation, but the other
patterns can be used for such systems, too.
When laying the double parallel pattern (figure
b), the supply pipe is installed first, with
double spacing. At the end of the pattern, the
pipe is bent 180º and the return pipe is then laid
in the gaps between the supply pipe so that every
other section switches between a cold return area
and a hot supply area. This double parallel pat-
tern distributes the heat better than the single
parallel pattern.
The single parallel pattern (figure c) should only
be used for installations with electronic regula-
tors that control on the basis of On/Off or timed
pulse modulation. It should never be used for
systems with self-acting regulators.
Floor constructions
c) Single parallel pattern.
13
Correct distance between pipes and correct installation depth.
Excessive distance betweens pipesand insufficient installation depth.
Timed pulse modulation completely opens the
manifold valve and then closes it completely after
a period that depends on the deviation from the
desired room temperature. On/Off regulation
opens the manifold valve completely when the
room temperature falls below the desired level,
and then closes it again when the room tempera-
ture is as desired. The flow in the underfloor
heating pipes is thus so great when heat is
"called for" that the temperature drop across the
pipes is minimal and therefore does not affect
comfort.
Cold zones
It is a good idea to lay underfloor heating pipes
closer together in those areas of the room that
contain "cold zones". These are typically located
near large window sections, sliding doors and the
like. In such zones, the distance between pipes
with a diameter of 15-20 mm should not be less
than 50 mm and the total width of the layout
pattern in the cold zone should not exceed
300-500 mm out of consideration for the overall
pressure drop across the circuit.
Pipe dimensions
Underfloor heating pipes supply heat to the floor
through their surfaces. The area of the surface,
which is dependent on the pipe dimension, thus
has an important role to play in underfloor
heating systems. If the dimension is reduced, the
supply temperature must be raised correspon-
dingly to ensure the transfer of the same amount
of energy. Another option, however, is to reduce
the distance between the pipes, thus
increasing the total length of the pipe.
Remember that pressure drop increases in
relation to the length of the pipe.
Resistance in the pipes is affected by the pipe
dimension, so pressure drop problems can occur
if the diameter of the pipes is too small, or if the
pipes themselves are too long. Today it is typical
recommended using pipes with an exterior dia-
meter of 15-20 mm and a maximum length of
100-120 m. This corresponds to an area of
approximately 25-30 m2 per circuit.
Distance between pipes and installation depth
If the distance between the pipes is too great, the
temperature will be unevenly distributed across
the floor. This means that the floor will be warm
right over the pipes but cold in between them.
The same applies if the pipes are laid too close to
the surface of the concrete.
A pipe diameter of 15-20 mm, a distance of 250
or 300 mm and an installation depth of 30-90
mm (in concrete) will ensure an uniform surface
temperature. For installations in concrete, the
uniformity of the surface temperature increases
in step with the installation depth, however, the
reaction time of the floor is equally increased.
14
Wooden floors
Wooden floors and heat emission panels/plates
are normally sold with instructions stating the
recommended pipe dimensions and distance
between pipes for underfloor heating circuits.
Pipes are installed directly beneath the wooden
floor itself, and as wood is a very poor heat con-
ductor, it is necessary to install heat emission
panels/plates. Most of these panels/plates are
supplied ready to fit with grooves for the under-
floor heating pipes. They are generally made of
aluminium, which spreads the heat evenly across
the entire floor. Today, heat emission panels/
plates are very efficient, and underfloor heating
pipes with a diameter of 15-20 mm can be laid
with a distance of 250 or 300 mm between them.
The thickness of wooden floor constructions can
vary, so the supply temperature will have to be
raised or lowered correspondingly. Here, it is
important to follow any guidelines from
the manufacturer of the wooden floor concerning
maximum surface temperature. Otherwise,
there is a risk of causing permanent damage to
the wooden floor. The supply temperature will
typically be 10-15 °C higher than the maximum
surface temperature, depending on construction
dimensions and heating requirements.
Wooden floors can be installed with underfloor
heating in many different ways, so it is important
to consult professional fitters for advice when
dimensioning and installing the systems. It is
also important to ensure that such floors are laid
correctly and in accordance with all the appli-
cable laws and regulations. It is especially impor-
tant to make sure that there is sufficient insula-
tion under the pipes to ensure optimal comfort
and energy efficiency.
Concrete floors
When installing underfloor heating in concrete
constructions, there should be at least 30 mm of
concrete above the underfloor heating pipes with
a dimension of 15-20 mm. This will ensure an
even distribution of heat throughout the floor. If
the pipes – with a distance between the pipes of
250-300 mm – are not installed at sufficient
depth, there is a risk of temperature variations in
the floor surface.
It is also important to make sure that there is a
layer of concrete under the pipes. This can be
done by laying a steel grid or similar and tying the
pipes to it. It is then simply a matter of using
spacer blocks or similar to raise the grid slightly
to allow the concrete to flow under the pipes
during the pouring process. The advantage of this
method is that the pipes are completely enclosed
in the concrete and therefore cannot expand
when heated, as this may eventually result in
leaks or burst pipes. At the same time, this
method ensures the best possible transfer of heat
to the concrete – and thus to the floor.
Concrete transfers heat better than wood, so it is
not necessary to use any form of heat conductor.
Generally speaking, concrete floors allow the
application of a lower supply temperature. If the
depth of concrete above the pipes is 30-90 mm,
the supply temperature can generally be set to
Example of a tiled concrete floor construction.Example of a wooden floor construction.
15
30-35ºC for normal heating requirements.
Concrete floors are normally finished with tiles,
linoleum, wood or carpet, and the optimal sur-
face temperature will be 19-29ºC (30-33ºC in
bathrooms).
Concrete constructions with underfloor heating
can be built up in several ways (see the illustra-
tion below).
Cooling across underfloor heating circuits
Cooling is equivalent to the difference in tempe-
rature between the supply and return flow in the
pipes and it influences a number of different factors.
Underfloor heating in normal residential applica-
tions is typically dimensioned for cooling of 5ºC
because this results in an uniform floor surface
temperature and a pleasant indoor climate.
Cooling is one of the reasons why it is necessary
to use double parallel patterns for underfloor
heating pipes, when using self-acting regulators
to ensure that temperature differences are not
transferred to the floor surface. However, this
does not apply to the same extent for systems
involving electronic regulation as the flow in such
systems is more constant and temperature diffe-
rences are not as noticeable.
In warehouses, sports halls, production facilities
and other rooms where the demand for comfort
is not normally as high as in residential buildings,
a higher level of cooling is acceptable. Doubling
the cooling will halve the flow, thus cutting the
necessary effect for the pump correspondingly.
Insulation
It is important to choose the right insulation as
early as the construction stage. This will help to
optimise the energy efficiency and comfort level
of the underfloor heating. Choosing the right
level of insulation will also reduce heating costs
throughout the lifetime of the building. The
relatively modest extra costs linked to using
sufficient insulation in the building phase will be
covered several times in the long term.
The supply and return flows of the underfloor
heating pipes must be insulated at the points
where they are led through adjoining rooms to
minimise heat loss and to ensure that these
adjoining rooms are not heated. If they are not
insulated correctly, it will also be difficult to regu-
late the temperature of separate rooms individu-
ally, and thus to save energy. Pipes must always
be laid within the weather screen to prevent
unnecessary heat loss.
It is also important to put plenty of insulation
under the pipes and along the edges of the
various rooms.
Suitable insulation also has the advantage of
allowing operation with the lowest possible sup-
ply temperature by reducing heat loss in the
entire underfloor heating system. Reducing the
supply temperature by just a few degrees will
result in appreciable savings on heating costs
without adversely affecting the level of comfort.
Please note that all legal requirements on
insulation, etc. must always be followed.
The level of insulation is of considerable importance to theefficiency of underfloor heating systems.
10
20
30
40
50
60
70
80
Con
cret
e flo
or
Conc
rete
floo
r with
car
pet
16 m
m w
oode
n flo
or
22 m
m woo
den f
loor
22 mm wooden flo
or with ca
rpet
Heating demands (W/m2)
Supply temperature (ºC)
With different floor coverings, the underfloor heating system requiresdifferent supply temperatures to convey the same heat output tothe room.
16
During the past 5-10 years, underfloor heating
has become the preferred form of heating for
residential buildings in many countries. It is
therefore important to be able to regulate the
underfloor heating system considering the indoor
climate and energy utilisation.
Underfloor heating systems do not normally react
as quickly to changes in temperature, so it is not
possible to raise or lower the room temperature
significantly within relatively short periods. After
all, these systems have to heat large masses –
such as concrete floors – rather than small radia-
tors. The material used and the floor construction
itself also have roles to play with regard to the
amount of heat accumulated in the floor.
In the past, underfloor heating was generally
reserved exclusively for bathrooms and utility
rooms because these rooms typically have tiled
floors. In wet rooms, underfloor heating had two
functions: to heat the floor and to keep the floor
dry.
Today, it is common in homes to use systems that
combine underfloor heating and radiators. This is
an ideal solution as the heating of the different
rooms in the home is subject to a range of diffe-
rent requirements. For example, it is desirable to
be able to change the room temperature in hobby
rooms, guest rooms and the like quickly to make
sure that they are warm and comfortable whene-
ver they need to be used. Radiators operate with
a higher surface temperature (50-70ºC) than
heated floors (19-29ºC), so radiators are often
the best solution for rooms of this type. In addi-
tion, an increasing number of homes feature
underfloor heating on the ground floor and radi-
ators on the first floor.
It is possible to combine heating systems by, for
example, installing underfloor heating in the
kitchen, bathrooms/toilets, utility room, living
room and hallway and then using radiators in the
other rooms – hobby room, guest room, etc. This
creates a set-up that has the high comfort level
and architectural advantages of underfloor
heating along with the rapid heat-up capability of
the radiators.
Combined heating systems
AMV 100
M1
DN15PN10KV 1
M1
DN15PN10KV 1
17
Combining underfloor heating and radiators
These two heating systems require different
supply temperatures – a factor that must be
taken into consideration when planning the
installation.
In the example illustrated, an electronic weather
compensator (ECL) is used to regulate the tem-
perature of the supply flow to the radiators. This
system is regulated on the basis of the outdoor
temperature, and the supply temperature will
typically be 40-70ºC depending on the season.
The differential pressure regulator ∆p (AVPL)
makes sure that the dimensioned differential
pressure across the motor valve on the supply
side is kept constant. This is important to ensure
the balance of the system and to make sure that
the motor valve operates within the regulation
range. The underfloor heating system involves a
separate mixing loop with a self-acting flow
temperature regulator (FTC) because here,
the supply temperature must be lower – usually
30-40ºC depending on the floor construction, the
level of insulation, floor covering, etc.
The rooms in the underfloor heating system is
regulated by an electronic control system (CF or
FH-Wx) in order to ensure the best possible
indoor climate in the separate rooms as well as
optimal energy utilisation throughout the entire
system. The radiators can be fitted with Danfoss'
well-known radiator thermostats, as this part of
the heating system operates independently of the
underfloor heating system.
Underfloor heating
The illustration above shows an example of an
underfloor heating system built up according to
the same principles as used in previous illustra-
tions. The heat source is direct district heating,
and the mixing loop is controlled by a self-acting
supply flow temperatur regulator (FTC). The
pressure across the valve (RA-N/FN/C) is kept
constant by a differential pressure regulator ∆p
(AVPL). The values for setting the differential
pressure are listed in the data sheet for the
differential pressure regulator. These values are
used as the basis for the dimensioning of both
the ∆p regulator (AVPL) and the flow temperature
regulation valve (FTC + RA-N/FN/C).
The supply temperature can also be controlled by
an electronic weather compensator (ECL). In this
case, a gear motor is fitted to the 2-way valve
and a number of sensors are used.
The manifold (CFD) is connected to the separate
underfloor heating pipes that supply the rooms
according to the heat "called for" by the room
thermostats (CFR). It is important to draw a
sketch of which underfloor heating circuits are
placed in which rooms when the pipes are instal-
led. This sketch is to be used when subsequently
fitting and setting the various self-acting heating
controls, and when pre-setting the water flow for
the separate circuits in relation to the sizes of the
individual rooms. This sketch will also be very
useful if, at a later stage, holes need to be drilled
in the floor to secure furnishings or the like.
Installations of this type can be room temperature
regulated by electronic, wireless (CF system) or
hard-wired (FH-Wx) control systems.
CFM
FTC
ECL
∆ p
FTC∆ p
CFR
TWA
CFD
CFR
CFM
TWA
CFD
18
The choice of regulation method for individual
room temperature control depends on how many
rooms the underfloor heating system is to cover,
and on how large these rooms are. In addition, it
is important to decide on the regulation method
before starting work on the floor construction as,
this may well be a defining factor in determining
the optimal layout pattern for the underfloor heating
pipes, for example.
Electronic regulation systems
Wireless system
The illustration above shows Danfoss' wireless
CF system. The master regulator (CFM) in the
system makes sure that the radio signals from
the room thermostats (CFR) are processed, and
that the necessary regulations are implemented.
A room thermostat is fitted in each room.
If the room temperature deviates from the tem-
perature setting of a given room thermostat
(CFR) this thermostat sends a wireless radio
signal to the master regulator (CFM), which, in
turn, either opens or closes the flow to the under-
floor heating circuit in the room in question. This
regulation is carried out via a thermal actuator
(TWA) fitted to the associated valve in the mani-
fold (CFD).
The wireless room thermostats (CFR) are easy to
fit as they do not need to be connected via wires
or cables. It is also possible to set back the
temperature manually on the room thermostats
(CFR).
The manifold (CFD) consists of a supply pipe and
a return pipe. The flow to the separate under-
floor heating circuits can be pre-set in the supply
side of manifold. In this way, it is possible to
ensure that all the underfloor heating circuits are
pre-set for precisely the right volume of water
(flow). The regulation valves for the underfloor
heating circuits are located in the return side of
the manifold, and every valve is equipped with a
thermal actuator (TWA), which is controlled by
the master regulator (CFM).
If required, the system can also be fitted with a
zone regulator (CFZ), which can divide the regu-
lation of the different rooms into as many as six
zones. The zone regulator (CFZ) is connected to
the master regulator (CFM) via a bus cable. The
zone regulator (CFZ) can send signals about, for
example, running at a lower room temperature in
the different zones at different times – such as
during holidays.
The master regulator (CFM) has eight outputs
and can therefore control eight separate room
temperatures at the same time. The room ther-
mostats (CFR) can be assigned to multiple out-
puts in large rooms with more underfloor heating
circuits.
The system can be extended through one or two
slave regulators (CFS) with eight outputs each.
This means the system can comprise up to 24
outputs. In office environments, for example,
where it may be necessary to use even more
room thermostats (CFR), it is possible to fit add-
itional master regulators (CFM) and thus to
increase the number of outputs even further.
The outputs of the slave regulators (CFS) are
equivalent to those of the master regulator
(CFM), but the slave regulators do not contain
radio receivers and therefore cannot be used on
their own. The master and slave regulators
Regulation methods using Danfoss control systems
CFZ
TWA
CFD
CFM
CFR
CFZ
CFM
CFS 1
1 - 8
9 - 16
17 - 24
CFS 2
CFRCFDwith TWA
19
(CFM/S) are connected through a bus cable and
all the room thermostats (CFR) are assigned to
outputs via the master regulator (CFM). The
system is easy to install as there is no need to
run wires to every single room. All that is
required is the installation of a wireless room
thermostat (CFR) assigned to the master regula-
tor (CFM). The costs associated with installing
the wireless system (CF system) are significantly
lower than the installation costs for hard-wired
systems (FH-Wx).
Hard-wired system
Danfoss also supplies a 24V hard-wired electronic
solution (FH-Wx) with an integrated transformer
for direct connection to a 230V power supply (see
illustration). In the hard-wired system, each
individual room thermostat (FH-WT/S/P) is con-
nected to the connection box (FH-WC) via wires.
In the connection box (FH-WC), the wires from
the thermal actuators (TWA) are connected to
the associated wires from the room thermostats
(FH-WT/S/P). It is possible to connect up to
12 room thermostats. A boiler or pump relay
FH-WT FH-WS
Remotesensor (optional)
Remotesensor(optional)
FH-WP
FH-WC
Connection box with 12 inputs/outputs and timer
(FH-WR) can also be fitted. This uses a potential-
free switch to start and stop the boiler or pump.
Finally, a timer module/kit (FH-WN) can be fitted
if required. This unit divides the rooms in the
building into two zones and controls them on the
basis of different user patterns – such as tempera-
ture set back.
The room thermostats (FH-WS/P) can be connec-
ted to an external floor sensor that can be used
for regulation on the basis of the floor tempera-
ture, thus overriding the room temperature set-
ting. This option is often used in bathrooms, etc.
The cost price of a hard-wired system is often
lower than for a wireless system, but the instal-
lation costs are higher due to the time needed to
run the wires from room to room.
All three patterns for laying out underfloor
heating pipes mentioned in the "Floor construc-
tions" section can be used for electronic regula-
tion systems. However, there can be advantages
in choosing the double parallel spiral pattern.
M1
DN15PN10KV 1
M1
DN15PN10KV 1
Min
IkPa
/r
20
Self-acting regulation systems
Two models of the self-acting regulator (FHV) are
available for building into walls. One model (FHV-A)
regulates according to room temperature while
the other (FHV-R) does so on the basis of the
return temperature in the underfloor heating
circuit and must therefore be fitted in the return
pipe (see illustration). Choosing the model that
regulates on the basis of the temperature of the
return water (FHV-R), please note that – in con-
trast to model FHV-A – the regulator will never
shut off the heat supply completely, even though
there may be free heat in the room, as
it is designed to keep the floor temperature
constant.
The regulators close as the temperature rises,
which, in the case of the FHV-R model, means
that when the water has transferred its heat to
the floor and therefore has been cooled to below
the pre-set temperature, the regulator will let the
water pass. At the same time, new hot water will
be let into the circuit from the supply side so the
temperature begins to rise again, and when it
reaches the FHV-R it will begin to close slightly
once more. The whole process then starts again.
If the self-acting regulator (FHV) is used
without a recommended mixing loop – because
there is only underfloor heating connected to a
radiator in an utility room, for example – it is
important to make sure that you do not exceed
the maximum allowable temperature for the
floor.
Self-acting regulators (FHV) reduce the flow in
the circuit proportionally to the deviation from
the set temperature. It is therefore important to
take this into account when selecting the layout
pattern – which should ideally be of the double
parallel spiral pattern type.
It may be a good idea to lay the first metres of
the underfloor heating supply pipe along an
exterior wall, as it is in such areas that the
radiant cooling is highest.
Self-acting regulators (FHV) are particularly well-
suited to regulate underfloor heating temperature
in single rooms, such as bathrooms and utility
rooms.
FHV-R
∆pFTC
M1
DN15PN10KV 1
M1
DN15PN10KV 1
Min
IkPa
/r
FHV-A
FTC∆p
Product Item no. Description
CFM-24 088H0041 Master regulator, 24 V outputs
CFR 088H0203 Wireless room thermostat, battery-powered, calls for heat via radio signals
CFZ 088H0004 Zone regulator
CFD 4+4 088H1004 Manifold with four regulation valves
TWA-A 088H3110 Thermal actuator, RA valve connection, 24 V, no-current closing (NC)
22
Examples of use
Areas of use and description
The wireless CF system is usually used in instal-
lations with individual room temperature regula-
tion of several rooms that have underfloor
heating. It is likewise commonly used in instal-
lations that combine underfloor heating and radia-
tors, and it is ideal for renovation projects, as it
is generally cheaper and easier to install than
hard-wired systems. The battery-powered room
thermostats are very sensitive and react – via
radio signals – to very small deviations from the
desired room temperature. The system has a
simple, stylish and functional design that blends
seamlessly into its surroundings. The system
makes no specific requirements to the layout of
the underfloor heating circuits as the flow is con-
stant. The supply temperature is controlled via
the motor valve by a weather compensator. When
setting the supply temperature, remember to
take into account the floor design and surface
covering.
Components and functions
CFM: Electronic master regulator with outputs for
eight thermal actuators. The master regulator
receives and processes the radio signals from the
room thermostats. It can be extended with up to
two slave regulators (CFS) with eight outputs
each.
CFR: Wireless room thermostat for fitting in each
room where the room temperature is to be con-
trolled by the regulation system. This regulation
is done via radio signals to the master regulator.
CFZ: Zone regulator (optional) is used for time
and zone control (temperature reduction during
pre-defined periods) of the underfloor heating
system by dividing the rooms into zones.
TWA:Thermal actuator connected by a wire to an
output on the master regulator. When heat is
"called for" the actuator opens the regulation
valve in the manifold.
CFD: Manifold connected to the underfloor
heating pipes. Available in a range of sizes with
various numbers of regulation valves.
M1
DN15PN10KV 1
M1
DN15PN10KV 1
AMV 100
CFM
CFD
TWA
CFR
Wirelessregulationsystem
ECL
∆p
CFZ
23
Areas of use and description
The hard-wired FH-Wx system is typically used
for individual room temperature regulation of
underfloor heating in several different rooms. The
system also makes it possible to regulate on the
basis of floor temperature and to override room
temperature control via a remote sensor in the
floor (often used in bathrooms, for example). The
system can be used in underfloor heating instal-
lations and in combined systems – consisting of
radiators and underfloor heating, for example.
The system makes no specific requirements to
the layout of the underfloor heating circuits as
the flow is constant. The self-acting flow
temperature regulator (FTC) can be set to the
desired supply temperature when initially
commissioning the installation. Remember that
the supply temperature is subject to different
requirements in combined heating systems.
Components and functions
FH-WC: Electronic connection box in which room
thermostats are connected with up to 12 thermal
actuators. Available with or without a timer module
that makes it possible to divide areas into two zones
with different timing patterns. A relay for boiler or
pump control is available as an accessory.
FH-WT/S/P: Hard-wired thermostats. Available
in a standard version and a featured version with
a manual local night set-back feature and the
option of connecting a floor sensor (a tamper-
proof model of the latter for institutions etc. is
also available).
TWA: Thermal actuator connected by a wire to
an output on the connection box. When heat is
"called for" the actuator opens the regulation
valve in the manifold.
CFD: Manifold connected to the underfloor
heating pipes. Available in a range of sizes with
various numbers of regulation valves.
Product Item no. Description
FH-WC 088H0020 Connection box, 12 x 24 V outputs and integrated timer module
FH-WT 088H0022 Wired room thermostat, standard model
FH-WP 088H0023 Wired room thermostat, institution model
FH-WS 088H0024 Wired room thermostat, featured model
FH-WF 088H0025 Floor sensor
CFD 4+4 088H1004 Manifold with four regulation valves
TWA-A 088H3110 Thermal actuator, RA valve connection, 24 V, no-current closing (NC)
FH-WC
FTC∆p
TWA
CFD
FH-WT/S/P
Hard-wiredregulationsystem
24
Areas of use and description
This system is designed for controlling underfloor
heating in individual rooms such as bathrooms
and utility rooms, where a constant floor tempe-
rature is required. It is also often used in com-
bined installations involving radiators and under-
floor heating in one or more rooms, each with its
own individual control. It is important to lay out
the underfloor heating pipe in a double parallel
pattern – ideally a spiral. The self-acting return
temperature regulator is fitted in the return flow
as shown in the illustration.
Components and functions
FHV-R: Used with a FJVR thermostat to regulate
the temperature on the surface of the floor on the
basis of the return temperature in the underfloor
heating pipe.
M1
DN15PN10KV 1
M1
DN15PN10KV 1
Product Item no. Description
FHV-R 003L1000 Underfloor heating valve for FJVR thermostat, for fitting in the return flow
FJVR 003L1040 FJVR thermostat, 10-50 °C, return temperature limiter
FTC∆p
FHV-R
Self-actingregulationsystem
25
Areas of use and description
This system is designed for underfloor heating in
individual rooms where a constant room tempe-
rature is required. The regulation is self-acting
and it is therefore important that the underfloor
heating pipe is laid out in a double parallel
pattern – ideally a spiral. The self-acting room
temperature regulator is fitted in the supply flow
as shown in the illustration. Please note that
the regulation will result in a decrease in floor
temperature if the room receives free heat from
the sun or other sources of heat.
Components and functions
FHV-A: Used with a radiator thermostat to
regulate the room temperature in a single room.
Product Item no. Description
FHV-A 003L1001 Underfloor heating valve for RA 2000 thermostats, for fitting in the supply flow
RA 2000 Various versions RA 2000 radiator thermostat
M1
DN15PN10KV 1
M1
DN15PN10KV 1
FHV-A
FTC∆p
Self-actingregulationsystem
26
Product catalogue
Product Description Item no.
CFM-24(1) Master regulator, 8 x 24V outputs incl. installation cable 088H0041
CFS-24(1) Slave regulator, 8 x 24V outputs incl. bus cable 088H0042
CFM-230 Master regulator, 8 x 230V outputs incl. installation cable 088H0001
CFS-230 Slave regulator, 8 x 230V outputs incl. bus cable 088H0002
CFR Room thermostat, wireless (battery-powered) 088H0203
CFZ Zone regulator, incl. bus cable 088H0004
CF system - wireless
Is used for individual room temperature regulation in residential buildings with underfloor heating and can be adap-
ted to installations of all sizes. The room thermostats send data via radio signals, which allow maximum freedom
of choice for fitting and installation. This also makes the system ideal in connection with renovation and retrofit. The
battery-powered room thermostats are very sensitive and react to even minor deviations from the desired room
temperatures. As standard, the master regulator can be associated to a maximum of eight room thermostats and the
system can be extended through the addition of up to two slave regulators (each with eight outputs). Also, a zone regu-
lator can be added to provide the option of dividing the rooms up into time or temperature zones (for night set-back or
reducing the temperature during holidays, etc.). The system is typically connected with a CFD manifold and TWA-A
thermal actuators. The system has a simple, stylish and functional design that blends seamlessly into its surroundings.
Electronic regulators for controlling individual room temperatures in underfloor
heating systems
Accessories Description Item no.
Bus cable 1 m, used to connect CFM, CFS, CFZ 088H0051
Bus cable 5 m, used to connect CFM, CFS, CFZ 088H0055
Installation cable Used for assigning CFR to CFM 088H0092
External antenna 1.8 m 088H0093
External antenna 4.8 m 088H0094
External antenna 9.8 m 088H0095
Product Description Item no.
FH-WC Connection box, 12 x 24V outputs 088H0019
FH-WC Connection box, 12 x 24V outputs, with integrated timer module 088H0020
FH-WT Standard room thermostat, 24V 088H0022
FH-WS Featured room thermostat, 24V, with manual local night set-back option 088H0024
and the possibility to connect a floor sensor, FH-WF
FH-WP Tamperproof version of FH-WS for institutions, etc. 088H0023
Accessories Description Item no.
FH-WN Timer module/kit for subsequent installation on FH-WC (088H0019) 088H0021
FH-WF Floor sensor, 3 m, can be used with FH-WS and FH-WP 088H0025
FH-WR Pump/boiler relay 088H0026
FH-Wx system - hard-wired
Is typically used for individual room temperature regulation of underfloor heating in multiple rooms and can be con-
nected to up to 12 room thermostats. Available with or without a timer module that makes it possible to divide areas
into two zones with different timing patterns. A relay for boiler or pump control is available as an accessory. The
system also makes it possible to regulate on the basis of floor temperature - with room temperature override - via
a remote sensor in the floor (used in bathrooms, for example). The system is typically connected with a CFD mani-
fold and TWA-A thermal actuators. Simple, stylish and functional design that blends seamlessly into its surroundings.
(1) CFM-24 & CFS-24 have integrated transformers and can be connected directly to a 230V power supply.
27
TWA thermal actuator
A range of versions of TWA thermal actuators – which open and close the regulation valves – are available for use
with both Danfoss' CFD manifold and RA valves, as well as with other manifold and valve products. The thermal
actuators all feature visual and touchable position indicators. Available with 24V or 230V supply voltage and in no-
current closed (NC) and no-current open (NO) versions. The no-current closed (NC) versions are very easy to fit as
a small locking split pin, which is easy to remove after installation, fixes the resistance of the spring force.
Product Description Item no.
FH-WT 230 Room thermostat, 230V 088H0127
Product Description Item no.
CFD 2+2 Supply+return flow sections, pre-setting and regulation valves (RA connection), 2 circuits 088H1002
CFD 3+3 Supply+return flow sections, pre-setting and regulation valves (RA connection), 3 circuits 088H1003
CFD 4+4 Supply+return flow sections, pre-setting and regulation valves (RA connection), 4 circuits 088H1004
CFD 5+5 Supply+return flow sections, pre-setting and regulation valves (RA connection), 5 circuits 088H1005
CFD 6+6 Supply+return flow sections, pre-setting and regulation valves (RA connection), 6 circuits 088H1006
CFD 7+7 Supply+return flow sections, pre-setting and regulation valves (RA connection), 7 circuits 088H1007
CFD 8+8 Supply+return flow sections, pre-setting and regulation valves (RA connection), 8 circuits 088H1008
CFD 9+9 Supply+return flow sections, pre-setting and regulation valves (RA connection), 9 circuits 088H1009
CFD 10+10 Supply+return flow sections, pre-setting and regulation valves (RA connection), 10 circuits 088H1010
CFD 11+11 Supply+return flow sections, pre-setting and regulation valves (RA connection), 11 circuits 088H1011
CFD 12+12 Supply+return flow sections, pre-setting and regulation valves (RA connection), 12 circuits 088H1012
CFE 2 x end pieces with draining, filling, and automatic air vent functions 088H1020
Connection pieces 2 x connection pieces for assembling different manifold sizes 088H1021
Reduction pieces 2 x reduction pieces, G 5/4" A x Rp 3/4" 088H1034
Reduction pieces 2 x reduction pieces, G 5/4" A x Rp 1" 088H1044
Assembly brackets 2 x assembly brackets for mounting the manifold on a wall 088H1022
CFD underfloor heating manifold
The CFD manifold is used for regulating underfloor heating systems involving multiple underfloor heating circuits.
Available with 2-12 circuits which can all be combined by connection pieces. Considering hydraulic balance, it is
possible to pre-set the flow in the manifold supply side to the separate circuits. The regulation valves are
fitted in the return flow, where TWA-A thermal actuators can be fitted and connected to one of Danfoss' electronic
room temperature regulation systems – a CF (wireless) or FH-Wx (hard-wired) system.
FH-WT 230V room thermostat - hard-wired
Danfoss also offers a hard-wired 230V thermostat that can be connected directly to TWA thermal actuators (230V)
fitted to a CFD manifold or valve.
Product Description Item no.
TWA-A Thermal actuator, 24V, NC, Danfoss RA connection 088H3110
TWA-A Thermal actuator, 24V, NC/S, end switch, Danfoss RA connection 088H3114
TWA-A Thermal actuator, 24V, NO, Danfoss RA connection 088H3111
TWA-A Thermal actuator, 230V, NC, Danfoss RA connection 088H3112
TWA-A Thermal actuator, 230V, NO, Danfoss RA connection 088H3113
TWA-K Thermal actuator, 24V, NC, connection to Heimeier/Oventrop/MNG valve types (2) 088H3140
TWA-K Thermal actuator, 24V, NO, connection to Heimeier/Oventrop/MNG valve types (2) 088H3141
TWA-K Thermal actuator, 230V, NC, connection to Heimeier/Oventrop/MNG valve types (2) 088H3142
TWA-K Thermal actuator, 230V, NO, connection to Heimeier/Oventrop/MNG valve types (2) 088H3143
(2) M30x1.5 mm valve connection and similar closing measure.
Compression fittings for CFD manifold
Compression fittings are important components in the context of assembling and installing underfloor heating pipes
on CFD manifolds or other Danfoss RA valves. Danfoss supplies a comprehensive range of compression fittings for
many different types of underfloor heating pipes – such as PEX plastic pipes or ALU-PEX pipes.
FHV-R regulator (floor temperature regulation)
The FHV-R self-acting regulator valve is a simple and elegant solution for building into walls. In combination with a
FJVR thermostat, it controls the floor temperature by regulating the return flow temperature through the underfloor
heating pipe. It is often used in systems that combine underfloor heating and radiators – where, for example, a con-
stant floor surface temperature is required in the bathroom or utility room. Available with a round or squared front
cover.
FHV-A regulator (room temperature regulation)
The FHV-A self-acting regulator valve is a simple and elegant solution for building into walls. Used with conventional
radiator thermostats to control room temperature and available with a round or square front cover.
28
Self-acting regulators for controlling individual room or floor temperatures
in underfloor heating systems
Product Description Item no.
Compression fittings G 3/4", diameter 12 x 2 mm, for PEX plastic pipes 013G4152
Compression fittings G 3/4", diameter 14 x 2 mm, for PEX plastic pipes 013G4154
Compression fittings G 3/4", diameter 15 x 2.5 mm, for PEX plastic pipes 013G4155
Compression fittings G 3/4", diameter 16 x 2 mm, for PEX plastic pipes 013G4156
Compression fittings G 3/4", diameter 18 x 2 mm, for PEX plastic pipes 013G4158
Compression fittings G 3/4", diameter 18 x 2.5 mm, for PEX plastic pipes 013G4159
Compression fittings G 3/4", diameter 20 x 2 mm, for PEX plastic pipes 013G4160
Compression fittings G 3/4", diameter 20 x 2.5 mm, for PEX plastic pipes 013G4161
Compression fittings G 3/4", diameter 12 x 2 mm, for ALU-PEX pipes 013G4182
Compression fittings G 3/4", diameter 14 x 2 mm, for ALU-PEX pipes 013G4184
Compression fittings G 3/4", diameter 16 x 2 mm, for ALU-PEX pipes 013G4186
Compression fittings G 3/4", diameter 18 x 2 mm, for ALU-PEX pipes 013G4188
Compression fittings G 3/4", diameter 20 x 2 mm, for ALU-PEX pipes 013G4190
Product Description Item no.
FHV-R Underfloor heating valve for FJVR, 3/4" connection, round front cover, air vent 003L1000
FHV-R Underfloor heating valve for FJVR, 3/4" connection, squared front cover, air vent 003L1006
FHV-R Underfloor heating valve for FJVR, 3/4" connection, round front cover, air vent 003L1015
+ draining and filling options
FJVR Return temperature limiter, 10-50 °C 003L1040
Product Description Item no.
FHV-A Underfloor heating valve for RA 2000 radiator thermostats, 3/4" connection, 003L1001
round front cover, air vent
FHV-A Underfloor heating valve for RA 2000 radiator thermostats, 3/4" connection, 003L1007
squared front cover, air vent
RA 2000 RA 2000 radiator thermostat Various versions
29
Product Description Item no.
ECL Comfort Weather compensator for boiler or district heating installation, incl. timer and socket, 230V 087B6828
100 M regulator Weather compensator for boiler or district heating installation, without timer, socket, 24V 087B1114
Analogue clock Analogue clock for ECL Comfort 100 M 087B1147
Socket Socket for ECL 100 087B1154
ECL Comfort 200 Regulator including digital clock and socket, 230 V 087B6868
(Program package to be ordered separately) Regulator including digital clock, without socket, 24 V 087B1124
ECL Comfort 300 Regulator including digital clock and socket, 230 V 087B6869
(Program package to be ordered separately) Regulator including digital clock, without socket, 24 V 087B1134
Socket Socket for ECL 200 and 300 087B1149
ECA 61 Remote setting panel with built-in sensor for ECL Comfort 087B1141
ESM 10 Room temperature sensor 087B1164
ESM T Exterior temperature sensor 084N1012
ESM 11 Installation temperature sensor 087B1165
ECL Comfort
Regulators that can be used both as weather compensators and constant temperature regulators. Available in a range
of versions to suit all needs. The settings and parameters of the regulators can be remotely controlled via a panel
with a bus port. The regulators can be used with 3-point gear motors (types AMV and AMB) and with On/Off ther-
mal motors (type ABV). ECL is available in 24V and 230V models with PT1000/0 °C sensors.
Electronic regulators for supply temperature control
Product Description Item no.
FTC Self-acting flow temperature regulator, 15-50°C 013G5081
Valves
RA-C 15 Straight valve with integrated pre-setting, Kv = 0.30-0.90 m3/h 013G3094
RA-C 20 Straight valve with integrated pre-setting, Kv = 0.80-2.60 m3/h 013G3096
RA-N Straight valve with integrated pre-setting Various versions
RA-FN Straight valve without pre-setting Various versions
FTC with attachable surface sensor
Flow temperature regulator for underfloor heating system with two-way valves of type RA-N, RA-FN or RA-C.
The choice of valve depends on flow requirements. The FTC is equipped with a surface sensor that is easy to fit on
the supply pipe.
Self-acting regulators for supply temperature control
For additional details, see data sheets for the individual products.
30
RAVK with immersion sensor
Supply temperature regulator that matches type RAV/VMT 2-way valves and type VMV 3-way valves.
Product Description Item no.
RAVK Self-acting flow temperature regulator, 25-65°C 013U8063
Valves
RAV 10/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 1.2 013U0012
RAV 15/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 1.5 013U0017
RAV 20/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 2.3 013U0022
RAV 25/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 3.1 013U0027
VMT 15/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 1.5 065F0115
VMT 20/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 2.3 065F0120
VMT 25/8 2-way valve for RAVK and type ABV thermal actuator, Kvs = 3.1 065F0125
VMV 15 3-way valve for RAVK and type ABV thermal actuator, Kvs = 2.5 065F0015
VMV 20 3-way valve for RAVK and type ABV thermal actuator, Kvs = 4.0 065F0020
For additional details, see data sheets for the individual products.
Product Description Item no.
AVDO 15 Self-acting pressure regulator, G 3/4" A connection 003L6020
AVDO 20 Self-acting pressure regulator, G 1" A connection 003L6025
AVDO 25 Self-acting pressure regulator, G 5/4" A connection 003L6030
AVDO 15 Self-acting pressure regulator, Rp 1/2" - R 1/2" connection 003L6018
AVDO 20 Self-acting pressure regulator, Rp 3/4" - R 3/4" connection 003L6023
AVDO 25 Self-acting pressure regulator, Rp 1" - R 1" connection 003L6028
AVDO
Self-acting automatic bypass regulator that can be used in underfloor heating systems having a constant pressure
pump. The AVDO shown here is a self-acting differential pressure regulator for fitting in a bypass.
Accessories
Product Description Item no.
ATC Safety thermostat, electro-mechanical, surface sensor 041E0010
ATC - safety thermostat
Thermostat that can be fitted to pipes and set as required. Often used as a safety thermostat for disconnecting the
boiler or pump in the event of errors in the installation.
32
Basic elements for regulation ofan underfloor heating system
1 23 4
M1
DN15PN10KV 1
M1
DN15PN10KV 1
AMV 100
M1
DN15PN10KV 1
M1
DN15PN10KV 1
AMV 100
Heat source Mixing loop Underfloor heating system Heat source Mixing loop Underfloor heating system
FTC FTC
P2
P2
ECL ECL
P2
P2
∆ p
∆ p
TWAAVDOAVDO
TWA
CFD CFD
TWA TWAAVDO
CFD CFD