Mohlenhoff Alpha Thermostat AR 2010 C2 Technical Information

Alpha-Thermostat Control
AR 20.. C2 ( 230 V) | AR 40.. C2 ( 24 V )
The Alpha-Thermostat Control 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. Temperature pre-selection is in 1/4 degree
steps. The selector switch (switching ball) allows the setting of
the desired operating mode (DAY, NIGHT or AUTOMATIC). The
plug-in digital clock can be removed for programming.
The thermostat 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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Operating mode selector switch
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Adjustment of temperature setback 2-6 K
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Limitation of set room temperature
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Illuminated "Moon" symbol for temperature setback
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Just-in-time installation concept
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Simple screwed connection technology in the Alpha System Base
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Functional design
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12 housing colours available
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Control functions
Digital timer “Control” for manual programming
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Day and week programming
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7 days power reserve
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1 channel with 42 memory locations (21 ON and 21 OFF switching
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times).
Free block formation and summer time conversion
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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 C2: Version 230 V – normally closed (pure white)
AR 4010 C2: Version 24 V – normally closed (pure white)
Scope of delivery (Standard)
Version: Alpha-Thermostat Control 230 V / 24 V – normally closed:
1 x AR 2010 C2 or AR 4010 C2
1 x Installation instruction
Alternative design:
AR 2110 C2: Version 230 V – normally open (pure white)
AR 4110 C2: 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: B 2012 / B 4012
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.. C2 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.
Selector switch
The desired operating mode can be selected with the selector switch.
The operating modes “Normal” (sun symbol), “Economy” (moon
symbol, e. g. for night operation) and “Timer” (clock symbol) are
available.
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
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 2022 / B 4022
Lock (for locking the thermostat on
the system base)
Temperature setback pre-selection
), a room temperature of 5 °C is set as target value
4
6
1. 2.
°C
OPEN
T 1A
AR 4010 C2
CLOSE
1025
Selector switch