sauter LET Series
The sauter LET Series is a multi-channel receiver that can be used to control underfloor heating systems. It is a wireless device that communicates with thermostats and other components of the system using radio signals. The LET Series can be used to control up to 8 channels, each of which can be assigned to a specific zone in the heating system.
The LET Series is easy to install and use. It comes with a clear and concise instruction manual that will guide you through the installation and setup process. Once it is installed, you can use the LET Series to control the temperature in your home from anywhere within range.
sauter LET Series
The sauter LET Series is a multi-channel receiver that can be used to control underfloor heating systems. It is a wireless device that communicates with thermostats and other components of the system using radio signals. The LET Series can be used to control up to 8 channels, each of which can be assigned to a specific zone in the heating system.
The LET Series is easy to install and use. It comes with a clear and concise instruction manual that will guide you through the installation and setup process. Once it is installed, you can use the LET Series to control the temperature in your home from anywhere within range.
1/30505916003 B
Receiver LET en
Quick reference
LET210R...LET260R
Installation instructions for the qualifi ed electrician
List of contents:
1. Description of the 230 V~ single-/multi-channel receiver
2. Installation and dimensions
3. Electrical connections
4. Addressing
5. Operation
6. Extended protective functions
7. What to do if...
8. Technical data
60
°C
0
140
°F
32
Description of the 230 V1 ~ single-/multi-channel
receiver
Thank you for the trust you have placed in us, and congratulations on
choosing one of our products. It will enable you to control the ambient
temperature of your home in a simple and intelligent manner.
This receiver controls the adjustment of your underfl oor heating,
and it operates in conjunction with the thermostats in the 230 V
system. There is wireless radio communication between the various
components of the system.
The multi-channel receiver is available in various versions. The only
difference between them is the number of outputs that are controlled
(4, 6 or 8 channels) but the basic functions are identical on all the
versions.
Installation and dimensions2
The receiver is positioned above or near the distributor for your
underfl oor heating. The place where you install it must be clean, and
must be protected against water splashes and ventilated. The single-
channel receiver can also be positioned decentrally.
Remove the cover1.
230 V
1
2
B11710
Installing the switching box2.
max Ø 4.5
B11711
LET240R/LET260RFig. 1
103
91
85
37
5
B11721
LET210RFig. 2
Electrical connections3
WARNUNG
Electrical connections
Before commencing any work on the electrical connections, you
must fi rst disconnect the device from the mains.
None of the 230 V~ connections must be made live until the
installation has been completed and the housing is closed.
Only qualifi ed electricians or the manufacturer‘s service staff are
permitted to open the receiver.
There are parts that carry mains voltage behind the cover.
The receiver must not be left unsupervised when it is open. (Prevent persons other Fig. 3
than specialists, and especially children, from gaining access to it).
230 V~
B11713
LET240R/LET260RFig. 4
230 V~
LN
B11714
LET210RFig. 5
B11708
B11709
2/3 0505916003 B
Assignment of outputs3.1
Output channels 1 to a maximum of 8 (depending on the version)
are identifi ed on the terminal strip by K1 to K8
(K1 = channel 1…K8 = channel 8).
For each channel, two 230V AC thermal drives can be connected
in parallel.
Example
Connecting two thermal drives to output channel K1
connect drive 1 to terminals 1 and 2•
connect drive 2 to terminals 3 and 4•
It is preferable to use wires with a cross-section of 1.5 mm
2
at most.
The other outputs are assigned in the same way:
B11715
Assignment of outputsFig. 6
Connecting the circulation pump3.2
You need two cables to make the connection: the 230 V power
supply cable and the power supply cable for the pump.
It is preferable to use wires with a cross-section of no more than
1.5 mm
2
zu verwenden.
Make sure that the 230 V~ cables are dead (no voltage).1.
Connect the 230 V power supply cable to input terminals N, L and 2.
PE.
Connect the power supply cable for the pump to output terminals 3.
Np, Lp and PE.
If the pump is fi tted with earthing, this is connected to earthing 4.
terminals PE.
The pump output will function as soon as one of outputs Â
K1 to K8 is activated.
B11716
230 V~
L N
Np Lp
PE PE
Connecting the circulation pumpFig. 7
Wiring diagram3.3
L
A10397
NPEPE
230 V~
NPLP 12 34
K1...K8
LED240R/LET260RFig. 8
.....
L N3
2
230 V~
1
LED
Memo
A10393
LED210RFig. 9
Addressing4
Addressing must only be undertaken by qualifi ed electricians.
To confi gure one or more zones within your system, the code that
the relevant transmitters use for controlling must be ‚taught‘ to each
individual reception channel. In this way, a specifi ed transmitter
within the system can be assigned to a selected channel (K1 to K8).
The transmitter may be a room thermostat, a programme switch or
a manual remote control unit.
Assigning a thermostat to a specifi ed reception 4.1
channel
On the receiver, briefl y press the Memo key for the selected 1.
channel once.
The red LED starts fl ashing quickly (2x/sec.). If you selected Â
the wrong channel, you can cancel the operation by pressing
the key briefl y again.
Then briefl y press the Send button on the thermostat once (see the 2.
operating instructions for the thermostat).
The thermostat sends a confi guration signal and the LED Â
fl ashes briefl y.
Wait about 1 minute3.
If the signal sent by the thermostat was received correctly, the Â
LED for the selected channel on the receiver will fl ash slowly at
fi rst (1x/2 sec.), and will go out after 5 seconds. The ‚teach-
in‘ - i.e. the process of assigning the thermostat to the control
channel - is now completed. As soon as the thermostat sends
the next signal, the devices will be active.
1
20
25
30
2
3
B11717
Assigning a thermostat to a specifi ed reception channelFig. 10
Additional information4.2
To enable you to assign several channels to the same thermostat,
the assignment in question can be duplicated on the various
channels. It is also possible to carry out the addressing on several
channels at the same time.
One single channel can only function with one single thermostat.
If you enter a second transmitter of the same sort on the same
channel, the fi rst one will be deleted.
© Fr. Sauter AG
Im Surinam 55
CH-4016 Basel
Tel. +41 61 - 695 55 55
Fax +41 61 - 695 55 10
www.sauter-controls.com
info@sauter-controls.com
Printed in Switzerland
3/30505916003 B
Operation5
Normal operation of a plant with room thermostats and receiver
The radio thermostats transmit the switching commands to control the
channels. These are defi ned during the addressing procedure while
the device is being commissioned. The channel then changes the
output signal according to the commands that are received.
Operating display for the channels5.1
The operating status of the individual channels is shown by the two
LEDs (green and red):
red LED lit: Heating ON Â
red LED off: Heating OFF Â
Operation the pump and the protection 5.2
function
The ‚pump‘ output is enabled (red LED lit) as soon as one of Â
the channels is working.
If none of the channels is working, the ‚pump‘ output is disabled Â
after a delay of two minutes.
If all the outputs are permanently disabled (e.g. if the plant is Â
running in frost protection mode), the pump is operated for
about 3.5 minutes after one week so that it does not jam at a
later stage.
Short function tests5.3
No initialisation must be running when you carry out
these tests.
Function test for a thermostat on a specifi ed channel (connection of
outputs, radio connection):
remove the thermostat setting knob and press the key briefl y.
If the signal is received, the assigned channel will invert the Â
switching status of the output (for a period of about 4 minutes!).
Operating faults 5.4
If no addressing procedure is running, a fl ashing LED indicates Â
a functional fault on the relevant channel.
Red LED fl ashing: the channel is no longer receiving a signal Â
from the assigned thermostat. The channel changes over to
frost protection mode (see section 6).
Extended protective functions6
Emergency function6.1
If the channel is no longer receiving a signal from the assigned Â
thermostat, e.g. if the batteries in the thermostat are fl at, it
changes over to emergency mode after 3 hours. 1/3 on, 2/3 off,
red LED fl ashes quickly.
Motor and pump protection6.2
If a channel remains inactive for more than a week, the motor Â
and the pump are automatically operated for 3.5 minutes. This
prevents them from becoming dirty and blocked.
What to do if...7
no channels at all are functioning? Â
the receiver has no power;
check the mains fuse or protective switch.
the teach-in has not been carried out; carry it out (see section 4).
one particular channel is not functioning? Â
the teach-in has not been carried out; carry it out (see section 4).
the red LED for a channel is fl ashing? Â
no radio connection to the assigned thermostat; check the
thermostat batteries.
the radio connection might be subject to interference; locate the
potential source of the interference.
the pump is not functioning? Â
check the cable connection and condition of the pump.
the receiver is outside the transmitter range? Â
move the transmitter closer to the receiver.
the receiver is subject to interference from other frequencies Â
(CB radio, TV screen, etc.)?
if possible, position the receiver elsewhere or move the source of
the interference.
the transmitter is in an interference zone? Â
position the transmitter outside of the interference zone.
Technical data8
Power supply
230 V AC +/-15%, 50 Hz,
with built-in delayed 1.0 A fuse
Outputs
2 thermal drives per channel•
pump, 230 V~, max. 2.2 A•
Standards
safety:
radio:
RTTE-immunity:
RTTE-radiation:
EN 60730-1/2-9
EN 300220-3
EN 301489-3
EN 300220-3
Umgebungs-
bedingungen
operation, between 0°C and 60°C•
storage, between -20°C and +60°C•
humidity 80% at 25°C (without condensate)•
IP 20 (EN 60529) modules•
IP 42 (EN 60529) multi.channel•
IP 44 (EN 60529) single-channel•
Protection class II (EN 60760)•
Radio receiver,
frequency
868.3 MHz
-
1
-
2
-
3
sauter LET Series
The sauter LET Series is a multi-channel receiver that can be used to control underfloor heating systems. It is a wireless device that communicates with thermostats and other components of the system using radio signals. The LET Series can be used to control up to 8 channels, each of which can be assigned to a specific zone in the heating system.
The LET Series is easy to install and use. It comes with a clear and concise instruction manual that will guide you through the installation and setup process. Once it is installed, you can use the LET Series to control the temperature in your home from anywhere within range.
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