Mohlenhoff Alpha Thermostat AR 2010 S2 Technical Information

Alpha-Thermostat Standard
AR 20.. S2 ( 230 V) | AR 40.. S2 (24 V)
The Alpha-Thermostat Standard is a digital room thermostat for
the control of surface heating systems with thermal actuators
(e. g. OEM actuator: A 2004 / A 4004).
This thermostat is equipped with microprocessor technology; it
shows excellent PI controlling behaviour with increased regulating
comfort for the user.
It must be mounted to the pre-installed Alpha Mounting Base
AS 1000, onto which it can be plugged at any time and to which
it must be electrically connected. In order to avoid damage to
this valuable thermostat during the construction phase, the
system base is not included in the scope of delivery; it can be
ordered already in advance for the necessary electric installation.
Features
Precise control response
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Antifreeze function 5 °C
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Valve protection function
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Overcharge protection
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Designs ”normally closed” (NC) and ”normally open” (NO)
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Temperature setback 2 K (fixed)
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Limitation of set room temperature
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Just-in-time installation concept
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Simple screwed connection technology in the Alpha Mounting
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Base
Functional design
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12 housing colours available
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Application
Individual room control, specially designed in connection with
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surface, radiator and convector heating systems.

General information

Type
AR 2010 S2: Version 230 V – normally closed (pure white)
AR 4010 S2: Version 24 V – normally closed (pure white)
Scope of delivery (Standard)
Version: Alpha-Thermostat Standard 230 V / 24 V – normally closed:
1 x AR 2010 S2 or AR 4010 S2
1 x Installation instruction
Alternative design:
AR 2110 S2: Version 230 V – normally open (pure white)
AR 4110 S2: Version 24 V – normally open (pure white)
Housing colour on request
Accessories
Alpha Mounting Base AS 1000
Connection recommendations
-OEM actuator NC A 2004 / NC A 4004
NO A 2104 / NO A 4104
-OEM base without pump control:
with pump control:
Customer-specific version:
Customer-specific versions are available on request
Ordering information
Our staff will be glad to assist you in finding the Alpha-Thermostat
fitting your application.
Call us under: +49 (0) 53 41 - 84 75 - 0
Technical Information
Alpha-Thermostat
Functions
The Alpha-Thermostat 20../40.. S2 is a PI thermostat for the control
of thermoelectric actuators (e. g. OEM actuator). The output voltage
is switched on or off depending on the difference between the room
temperature measured by the thermostat (actual value) and the
desired temperature (set value). The bigger the difference is between
set value and actual value, the longer are the switching cycles. When
the room temperature approaches the set temperature, the switching
cycles of the output voltage are reduced and find their balance at
an almost constant value corresponding to the heating power for
this room.
Valve protection function (only NC)
If an actuator is not triggered during more than 24 hours of normal
operation, the electronic system switches the actuator for 6 minutes
once every 24 hours. This prevents the thermostat valves from clogging
outside the heating season.
Antifreeze protection
If the set value element of the Alpha-Thermostat is set to the right
stop (symbol ), a room temperature of 5 °C is set as target value in
order to prevent the installation from freezing.
Overcharge protection
The switching output of all Alpha-Thermostats with microprocessor
technology is protected by an internal temperature monitoring system
in order to prevent the system from overcharge damage. In case of
an internal temperature rise due to overcharge the electronic system
automatically disconnects the output until the inside temperature
has dropped again to normal values.

Control panel

B 2012 / B 4012
B 2022 / B4022
1. 2.
OPEN
AR 4010 S2
AC 24V/1A
T 1A
CLOSE
1025
Lock (for locking the thermostat on
the mounting base)