LK Systems S2 Assembly Instructions

LK Room Thermostat S2, 24 V NC
LK Room Thermostat S2 is an electronic room
thermostat with a triac output specially adapted
for the LK Floor Heating System. The room ther-
mostat is used together with electrothermal ac-
tuators of normally closed (NC) type. To achieve
maximum energy efficiency the thermostat uses
so-called self-modulating technology via signal
pulses to the valve actuator. The self-modulating
technology adjusts the output of the underfloor
heating to the set temperature. Once the room
temperature approaches the set temperature, the
output of the heating is gradually reduced to pre-
vent overheating.
LK Room Thermostat S2, 24V NC is available
in two different designs, S2 and S2 EXT, where
S2 EXT can be connected to LK Remote Sensor
ICS/S2 for controlling e.g. floor temperature. The
room thermostat is also used in so-called public
environments, where the temperature setting of
the thermostat can be locked by pressing buttons
in combination.
Product range
• LK Room Thermostat S2 NC
(Article no. 243 43 98): Basic thermostat for con-
trolling room temperature
• LK Room Thermostat S2 EXT NC
(Article no. 243 44 00): Thermostat for controlling
room temperature or for controlling e.g. floor
temperature via LK Remote Sensor ICS/S2
(Article no. 241 73 23).
Accessories
• LK Remote Sensor ICS/S2, matches room ther-
mostat S2 EXT (Article no. 241 73 23)
Spare parts
• LK Pattress S2, comes supplied with the thermo-
stat, (Article no. 33454)
Particular benefits to note:
• Self-modulating technology via signal pulses for
maximum energy efficiency.
• Modern design with polished vitreous surface
and touch temperature setting.
• Intended for mounting directly on a wall, or on
an electrical installation box.
• Option of connecting a remote temperature sen-
sor for model S2 EXT.
• The room thermostat settings can be locked by
pressing buttons in combination.
• The temperature can be reduced via a separate
timer (timer not included).
• Silent thermostat function.
• Easy functional check via LED.
Assembly instructions | LK Room Thermostat S2, 24 V NC
Functional description
Normal mode for the room thermostat when in
operation is displaying current room tempera-
ture.
The temperature setting of the room thermostat
can be changed using the "arrow up" or "ar-
row down" touch buttons. When the buttons are
touched, the temperature display shows more
brightly. The thermostat is then displaying the
set/desired room temperature. Once changes
have been made with the "arrow up" or "arrow
down" buttons, the thermostat returns to a redu-
ced brightness level, once again displaying the
current room temperature.
The thermostat comes with a function LED which
shows whether the set temperature has been
reached or not. If the LED is off, the set tempera-
ture has been reached.
Installation
When fitting, bear the following in mind:
• Fitting height, approx. 1.5 m above floor level.
• Best installed on an inner wall.
• Make sure there is circulation of air.
• Avoid secondary heat from other heat sources,
such as sunlight, lighting, etc.
Electrical connection
1. Remove the back cover of the thermostat.
2. Fit the back cover to the wall. If the back
cover is to be fitted to an electrical box, the
pattress which comes supplied with the
thermostat should be used.
3. Electrical installation must be performed as
per the circuit diagram below.
EN.33.C.149.1511
1 (4)