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Now connect the mains cable and the connection cable to the
load. The numbers of the contact allocation can be found on
the screw terminals.
The power supply for the control electronics of the thermostat
is connected to the terminals 1 and 5 (L = phase, N = neutral).
The terminals 2, 3 and 4 are used to connect the electrical
load. Here the change-over contact of the relay is led out (2 =
“NC” = “normally closed” = closed when in the passive state;
3 = “NO” = “normally open” = open when in the passive state,
4 = “COM” = common contact).
The connection is dependent on the type of load or the posi-
tion of the two jumpers J1 and J2.
A heater can be connected if the jumpers J1/J2 are plugged
in to the right (A). If the temperature exceeds the value that
was set with the knob, the relay switches (the green LED
goes out) and terminal 3 and 4 will connect.
A cooling appliance/air conditioning unit can be con-
nected if the jumpers J1/J2 are plugged in to the left (B). If
the temperature is falling below the value that was set with
the knob, the relay switches (the green LED goes out) and
terminal 3 and 4 will connect.
When connecting a cooler/air conditioning, the unit should have a suitable protective
circuit in order to avoid consecutive switching operations that occur too frequently or
too fast.
Replace the cover properly and secure with the screw that you removed earlier.
Switch on the mains voltage.
Operation

The thermostat can be turned on with the sliding switch. The red power LED goes on, when
the thermostat is switched on; the thermostat is then ready for operation and will control the
connected load determined by the temperature setting.
Select the desired temperature with the control knob; depending on that setting, the con-
nected load is switched on or off accordingly. The green LED will go on once the relay/load is
switched on.
Troubleshooting

The temperature set on the thermostat deviates from the actual room temperature (e.g.,
as measured with a thermometer)
The heating power of your room radiator is insufficient (or the cooling power of your air con-
ditioning is too low).
The thermostat is affected by external heat (e.g., by sunlight, proximity to heaters or electrical
devices).
The thermostat is installed next to a door or window where draught affects the room tempera-
ture.
The thermostat is installed in a disadvantageous position, e.g., behind a curtain or on an
exterior building wall.
The room temperature is not the same everywhere in the room.
Depending on the existing heating system (e.g., underfloor heating), air circulation, installa-
tion height and the wall temperature, considerable variations between the set position on the
thermostat and the temperature measured with a thermometer may occur.
Slow response of the room temperature to the temperature set on the thermostat
In well-insulated buildings, it can take a long time for the room temperature to fall. On the
other hand, it can take a long time for the temperature to rise in poorly insulated buildings and
with cold exterior walls.
Underfloor heating also reacts very slowly to the temperature setting on the thermostat.
Maintenance and cleaning

The product is maintenance-free. Repair or maintenance work must be carried out by a spe-
cialist.
You can use a clean, dry, soft cloth for cleaning. Dust can be removed very easily with a vacuum
cleaner.
Do not use aggressive chemical or scouring cleaning agents, as this may lead to discolouration
or changes in the material on the surface.
1 2 3 4 5
L
N
°C
ON
OFF
NO
NC
COM
d) Handling, operation
Never overload the product. Observe the maximum connected load specified in
the chapter “Technical data”.
This product should never be touched or operated with wet hands. There is a risk
of a life-threatening electric shock!
Never pour any liquids above or next to the product. You run the risk of causing a
fire or a fatal electric shock!
If any liquid has still managed to enter the device, immediately turn off the mains
supply at all poles (turn off the automatic circuit breaker or remove the fuse, then
switch of the residual current operated circuit breaker of the associated circuits).
Contact a specialist. Do not use the product any longer.
Use the product only in a temperate climate, never in a tropical climate.
Do not use the product if it is damaged. There is a risk of a life-threatening electric
shock!
If it can be assumed that safe operation is no longer possible, the product must be
turned off and precautions must be taken to ensure that it is not used unintention-
ally. Do not touch the product or any device connected to it.
First switch off the mains voltage to all poles (switch off the connected circuit
breaker or remove the fuse and then switch off the connected RCD).
Safe operation can no longer be assumed if:
- the product shows visible signs of damage
- the product does not work at all or works poorly (leaking smoke or a smell of
burning, audible cracking noises, discolouration to the product or the adjacent
surfaces)
- the product was stored under unfavourable conditions
- it was exposed to heavy loads during transport
Preparations for connection and installation

The device must be voltage-free during installation and connection.
Switch off all the poles of the mains cable by removing the corresponding fuse or switching
off at the circuit breaker. Then, also switch off the associated ground fault circuit interrupter
(breaker). Secure it against unauthorised reconnection, e.g. with a danger sign.
Check that the mains leads are without current, e.g., by means of an appropriate tester.
Select an appropriate installation location.
To ensure the thermostat is functioning properly, it must be installed away from
heaters, windows, doors, air discharge openings, etc. Also keep the thermostat out
of drafts.
Do not mount the thermostat behind furniture or curtains.
The thermostat should not be mounted there because the exterior walls of a building
generally tend to be colder than the walls in the interior of the building (depending
on the building insulation).
Wall heaters work with air convection. Thus, warm air rises from the heater, cools
slowly and sinks back down on the other side of the room. Therefore, an ideal loca-
tion for installing the thermostat is on the wall opposite a heater.
Installation and connection

Pay attention to the chapter “Safety instructions” and the chapter “Preparations for
connection and installation”.
First, switch off the mains voltage to all poles.
Turn the two housing screws out using a suitable screwdriver. Remove the cover of the
thermostat.
The base plate with the electronics can be mounted via the two mounting holes using suitable
screws (and possibly plugs).
Make certain when drilling and tightening the screws that no cables or pipes are
damaged!
5

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