Application Guide
Heating Control
Danfoss Link™ & Connect Thermostats
www.heating.danfoss.com
Application Guide Heating Control with Danfoss Link™ & Connect Thermostats
Table of Contents
1. Introduction
1.1 S egm ent .............................................................................. 3
1.2 Danfoss Eco® programmable radiator thermostat ....................................... 3
1.3 Overview of units in a Danfoss Link™ system ............................................ 3
1.4 Number of units in a Danfoss Link™ system ............................................. 4
1.5 Best Practice .......................................................................... 4
2. General Guidelines
2.1 Heat supply ........................................................................... 6
2.2 Functions ............................................................................. 7
2.3 Rooms ................................................................................ 8
3. Applications
3.1 Heating system with Boiler ........................................................... 11
3.2 Heating system with Central Boiler.................................................... 13
3.3 District Heating....................................................................... 14
3.4 Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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1. Introduction
1.1 Segment
1.2 Danfoss Eco™
programmable
radiator thermostat
1.3 Overview of units
in a Danfoss Link™
system
This application guide covers the use of Danfoss Link™, Danfoss Link™ Connect Thermostat wireless
heating controls and Danfoss Eco™ in 1 and 2 family houses and flats up to 300 m2.
Danfoss Eco™ is a stand-alone intelligent and programmable radiator thermostat*
for residential use, where a central control system is not available
It is easy to install and is supplied with adapters for all thermostatic valves manufac-
^
tured by Danfoss and most other radiator valve manufacturers.
The following units can be used in a Danfoss Link™ wireless system:
Danfoss Link™ CC Central
Controller is the unit, from which
the entire installation can be
controlled. One Danfoss Link™ CC
is always needed in a system.
Danfoss Link™ HC Hydronic Controller
allows control of hydronic floor heating with
21,5°
Danfoss Link™ Connect Thermostat is an electronic radiator
thermostat* for residential use,
which is controlled by a Danfoss
Link™ CC.
Danfoss Link™ RS Room Sensor
is used for measuring and adjusting the room temperature.
^
^
^
a large range of functions.
^
^
Danfoss Link™ FT Floor Thermostat is used for measuring and
adjusting electrical floor heating.
is a unit for turning gas and oil
boilers ON/OFF, depending on
heating demand.
Danfoss Link™ RU Repeater
Unit is used for extending the
wireless transmission range
between Danfoss Link™ CC and
other units in a system.
* Danfoss recommends using Connect and Eco™ Thermostats together with Danfoss radiator valves with
integrated pre-setting in order to achieve optimal performance.
For choise of adaptor please use the Danfoss adaptor guide, which also includes adaptors for non Danfoss
valves.
Danfoss Link™ BR Boiler Relay
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Danfoss Link™
Link
RU
1.4 Number of units in a
Danfoss Link™
system
1.5 Best practice
When building a wireless Danfoss Link™ control system it is important to follow these rules:
1. The total number of units must not exceed 50 (1 Danfoss Link™ Central Controller + 49 units).
2. The number of each type of unit must not exceed: Danfoss Link™ CC......................1 unit
Connect Thermostat ................30 units
Danfoss Link™ HC.....................3 units
Danfoss Link™ RS ....................30 units
Danfoss Link™ FT ....................30 units
Danfoss Link™ BR......................1 unit
Danfoss Link™ RU..................... 3 units
Mains powered units
Avoid disconnecting mains powered units in
a Danfoss Link™ system. In the event this happens the system will eventually re-establish the
network, when repeater unit is reconnected to
the mains power.
RU
230 V
Danfoss Link™ RU Repeater units
It is always recommended to use Danfoss Link™ RU, when a repeater is needed to extend the radio
communication range. Several mains powered units (such as relays) also act as repeaters, but with
limited capability to improve the communication range compared to Danfoss Link™ RU.
Danfoss Link™ RU repeaters should always be registered as the first 230 V units in the system.
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Application Guide Heating Control with Danfoss Link™ & Connect Thermostats
Danfoss Link™ RS Room Sensor
The Danfoss Link™ RS is designed to measure the
room temperature and control the Connect Thermostats to reach the set room temperature.
The Danfoss Link™ RS is useful in all applications
where the actual temperature at the Connect
Thermostat is significantly different from the desired room temperature., or if you have multiple
radiators in the same room.
Do not install Danfoss
Link™ RS on outer walls or
where it will be subject to
direct sunlight.
Best performance of the system with Connect
Thermostats and Danfoss Link™ RS is achieved,
if the RS is not too far from the radiator, best
between 1 and 5 meters.
Make sure to select the proper settings for the
Connect Thermostat and Danfoss Link™ RS on
Danfoss Link™ CC. Choose the “covered radiator”
option if the radiator is behind a fixed radiator
cover and possibly if the radiator and Connect
Thermostat is covered by heavy furniture.
The installation height
should typically be
between 80-150 cm.
In wet rooms Danfoss
Link™ RS shall be installed
according to local building
regulations.
At least 50 cm away from
windows/doors that will
be left open occasionally.
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40 °C
2. General Guidelines
2.1 Heat supply
If the heating system has been optimized for constant set temperature around the clock, you may
need to adjust the settings when working with setback periods. When changing the temperature
from a low economy setting to a comfort temperature, the system must be able to supply enough
heat to raise the room temperature at least 1 °C per hour to perform well. Compared to a steady
temperature the heating system must typically be able to supply 25% more heat, but only for a
short period of time during heat up.
BOOST
ENERGY
ECONOMY COMFORT
How to achieve 25% extra capacity in a system that should run boost:
Limitations Action
Max. ΔP and temperature reached: Increase valve presetting
Max. temperature and preset reached: Increase pump pressure
Max. preset and ΔP reached: Increase water temperature
Note: Maximum acceptable presetting, water temperature and pump differential pressure settings are
different from system to system and depend on the application.
For radiator valves with pre-setting, balance the system
to allow for enough flow.
The supply line temperature at the radiator valves should be
above 40 °C to ensure optimal control.
Make sure that the supply water temperature and flow is
adequate to provide enough energy.
Increase the temperature or the pump level, if necessary.
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Application Guide Heating Control with Danfoss Link™ & Connect Thermostats
2.2 Functions
Connect Thermostats have a built-in function, which automatically shut off the heat while the room is ventilated. When the
thermostat detects a drop in room temperature, it closes the
valve.
To prevent excessive cooling of the room, the thermostat will
automatically open the valve again after 30 minutes, meaning
that during longer periods of ventilation you must manually
set the temperature down.
To prevent multiple detections of ventilation, e.g. caused by
opening a door, leading to instability, the thermostat will not
detect a new ventilation session in a period of 45 minutes from
the previous occurrence.
Be aware that a large window sill might prevent the Connect
Thermostat from detecting cold air from an open window, and
thereby not activate the automatic Open-window function.
If the radiator is under or oversized in relation to the room, the
settings should be changed accordingly.
Connect Thermostat: to change the settings, please refer to
the Connect Thermostat installation and user guide.
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The adaptive learning function (Forecast) ensures that the comfort temperature is reached at set
time. The warm up time is continuously adjusted according to seasonal temperature changes.
• Adaptive learning ensures the wanted temperature at the wanted time (here 20 °C at 07:00).
• Adaptive learning uses data from the previous 7 days to be able to reach the correct temperature
at the right time.
• Adaptive learning is sensitive to large, rapid temperature changes.
2.3 Rooms
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Winter: Long warm up time. Spring/fall: Short warm up time.
Covering the radiator - e.g. with furniture, curtains or a radiator cover - might cause heat to be
accumulated around the thermostat.
Light curtain/furniture:
• Connect Thermostat: can
be used, but function is
improved by using a RS
room sensor.
• Danfoss Eco™: can be used,
but it might be necessary to
Medium curtain/furniture:
• Connect Thermostat: use
with Danfoss Link™ RS room
sensor.
• Danfoss Eco™: can be used,
but it might be necessary to
raise the set temperature.
Radiator cover:
• Connect Thermostat: use
with Danfoss Link™ RS room
sensor.
• Danfoss Eco™: not recommended in this situation.
raise the set temperature.
If two radiators are placed within 40 cm of each other, the heat
emission from one radiator can affect the thermostat on the
other radiator.
• Connect Thermostat: use with Danfoss Link™ RS room
sensor.
• Danfoss Eco™: balance the two radiators by adjusting the set
temperature on the affected radiator.
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Direct heat radiation from large radiators may
disturb the Connect Thermostats ability to
measure the room temperature correctly.
To avoid this, mount the thermostat pointing
away from the radiator.
The optimal solution is a Connect Thermostat
with a Danfoss Link™ RS room sensor.
Danfoss do not recommend to use an angle adapter, instead the valve should be turned or replaced.
A fireplace in the room can affect the adaptive learning
function of the Connecct Thermostat and disturb the heating
control.
If you use your fireplace regularly it is recommended to
deactivate the adaptive learning.
By deactivating the adaptive learning function, Connect will
work as a traditional thermostat, but with a delay in heating up
the room after the fire has burned out.
Note: If the valve has been closed for a longer period there may be
a delay in heating up the room.
Sunlight from large windows in the room can affect the
adaptive learning function of the Connect Thermostat and
disturb the heating control. Then it is recommended to
deactivate the adaptive learning.
By deactivating the adaptive learning function, Connect will
work as a traditional thermostat, but with a delay in heating up
the room after the heating from the sunlight has stopped.
Continuous draft from a leaky window or garden door directly
on the Connect Thermostat will disturb the heating control.
• Connect Thermostat: use with Danfoss Link™ RS room
sensor.
• Danfoss Eco™ : We do not recommend using Danfoss Eco™ in
installations where temperature measurement at the
thermostat is not representative of the room temperature.
In an installation with frequent draft, the regulation may
become instable and lead to fluctuating temperature and
reduced battery life.
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Connect Thermostats are primarily designed to be used with
supply valves.
But Connect Thermostats can also be used with return valves
on small radiators (smaller than 120 cm diagonally, rule of
thumb).
On larger radiators with return valves Connect Thermostats are
not recommended.
Neither Connect Thermostat nor Danfoss Eco™ should be used
on convectors placed in floor trenches.
max. 120 cm
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Ce
t
Boiler OFF
Boiler ON
Boiler OFF
Boiler ON
3. Applications
3.1 Heating System
with Boiler
Description
A boiler with build-in or external domestic hot
water tank can provide instant heat for the
heating system, as well as for the domestic hot
water.
The system can be operated with or without a
Danfoss Link™ BR (Boiler Relay).
Minimum requirements
minimum 40 °C supply temperature at the
valve.
sufficient heating capacity to increase the
room temperature with 1 °C per hour.
only radiator valves approved for Danfoss
adapters.
Note! Bypass valve is recommended.
Recommendations
Central room temperature
with night setback
If a central room temperature controller is used
in combination with Connect Thermostats, it
must only be as temperature limiter.
ntral Room
Temperature
Controller
Max. temp.
Comfort temp.
Connect
Thermosta
Setback temp.
Min. temp
Boiler turned off at night
If the boiler is turned off or has reduced temperature during the night, then make sure that it is
active when the Connect Thermostat is programmed to warm. In a system with Danfoss Link™ CC
and Connect Thermostat, this can be controlled automatically by adding a boiler relay
With Forecast: The Forecast period should vary
over the year, but typically the boiler will start
Without Forecast: The boiler should typically
start up ½ hour before the comfort period.
up to 3 hours before the comfort period.
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Outdoor Air Temperature (˚C)
Supply Water Temperature (˚C)
20 15 10
80
Weather compensation
If the boiler’s heating curve is set to have the
radiator thermostats on comfort temperature
constantly, the curve must be increased in order
to be able to raise the room temperature after a
setback period.
• If the setback periods are long, further
increase might be necessary.
• If the economy periods are short, less increase can be sufficient.
Boiler relay
Set Danfoss Link™ BR boiler relay to automatic ON/OFF in the Danfoss Link™ set-up menu.
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Boiler OFF
Boiler ON
Boiler OFF
Boiler ON
Outdoor Air Temperature (˚C)
Supply Water Temperature (˚C)
20 15 10
80
3.2 Heating System
with Central Boiler
Description
A large gas, oil or pallet boiler which provides
hot water to several households.
Min. requirements
min. 40 °C supply temperature at the valve.
sufficient heating capacity to increase the
room temperature with 1 °C per hour.
only radiator valves approved for Danfoss
adapters.
Recommendations
Boiler turned off at night
If the boiler is turned off or has reduced temperature during the night, then make sure that it is
active when the Connect Thermostat is programmed to warm. In a system with Danfoss Link™ CC
and Connect Thermostat, this can be controlled automatically by adding a boiler relay
With Forecast: The Forecast period should vary
over the year, but typically the boiler will start
Without Forecast: The boiler should typically
start up ½ hour before the comfort period.
up to 3 hours before the comfort period.
Weather compensation
If the boiler’s heating curve is set to have the
radiator thermostats on comfort temperature
constantly, the curve must be increased in order
to be able to raise the room temperature after a
setback period.
• If the setback periods are long, further
increase might be necessary.
• If the economy periods are short, less increase can be sufficient.
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Outdoor Air Temperature (˚C)
Supply Water Temperature (˚C)
20 15 10
80
3.3 District Heating
Description
District heating is generated in a centralized
location and distributed to residential and
commercial use.
Min. requirements
min. 40 °C supply temperature at the valve.
sufficient heating capacity to increase the
room temperature with 1 °C per hour.
only radiator valves approved for Danfoss
adapters.
Recommendations
Weather compensation / ECL
If the boiler’s heating curve is set to have the
radiator thermostats on comfort temperature
constantly, the curve must be increased in order
to be able to raise the room temperature after a
setback period.
• If the setback periods are long, further
increase might be necessary.
• If the economy periods are short, less increase can be sufficient.
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Outdoor Air Temperature (˚C)
Supply Water Temperature (˚C)
20 15 10
80
3.4 Heat Pump
Description
A heat pump is generating heating by transferring heat from a relatively low-temperature
reservoir, such as air or ground, to one at a
higher temperature.
Min. requirements
min. 40 °C supply temperature at the valve.
sufficient heating capacity to increase the
room temperature with 1 °C per hour.
only radiator valves approved for Danfoss
adapters.
Recommendations
Weather compensation
If the heat pump’s heating curve is set to have
the radiator thermostats on comfort temperature constantly, the curve must be increased in
order to be able to raise the room temperature
after a setback period.
• If the setback periods are long, further
increase might be necessary.
• If the economy periods are short, less increase
can be sufficient.
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60
50
40
30
20
If system is installed during period with outside temperature > 10° C opening point will not be
found untill temperature drops below 7-8° C. Can be solved by manually setting the heating curve
higher during the run in period (approx. 1 week).
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