Mohlenhoff Alpha Thermostat AR 2010 C2, Alpha Thermostat AR 4110 C2, Alpha Thermostat AR 4010 C2, Alpha Thermostat AR 2110 C2 Technical Information

Technical Information

AR 4010 C2

1025

Alpha-Thermostat

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

l Precise control response
l Antifreeze function 5 °C
l Valve protection function
l Overcharge protection
l Designs normally closed (NC) and normally open (NO)
l Operating mode selector switch
l Adjustment of temperature setback 2-6 K
l Limitation of set room temperature
l Illuminated "Moon" symbol for temperature setback
l Just-in-time installation concept
l Simple screwed connection technology in the Alpha System Base
l Functional design
l 12 housing colours available

Control functions

l Digital timer Control for manual programming
l Day and week programming
l 7 days power reserve
l 1 channel with 42 memory locations (21 ON and 21 OFF switching

times).

l Free block formation and summer time conversion

Application

l Individual room control, specially designed in connection with

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

-OEM base without pump control: B 2012 / B 4012

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

NO A 2104 / NO A 4104

with pump control: B 2022 / B 4022

Mikrocontroller Technology

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 ), 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

4

5

3

2

6

1.

2.

OPEN

CLOSE

Lock (for locking the thermostat on
the system base)

Temperature setback pre-selection

°C

T 1A

Selector switch

Room thermostats

Technical Information

Alpha-Thermostat

Technical data

Type AR 20.. C2 AR 40.. C2

Version Control
Contact rating max 5 OEM actuators 230 V
Operating voltage 230 V +/- 10%, 50 Hz
Switched current 0,2 A (ohmic load)
Control range (heating zone) 10 to 28°C
Temperature setback (heating zone) 2 - 6 K
Hunting approx. 0,2 K

Room thermostats

Valve interval switching if output is inactive for 24 h, once a day
Antifreeze protection on position* 5°C
Storage temperature -25 to +70 °C
Ambient temperature 0 to +50 °C
Relative humidity max. 80%

1)

Degree / class of protection IP 30 / II
CE conformity according to EN 60730
Housing ABS
Number of housing colours 12
Weight 74 g without Alpha Mounting Base

Note! The digital timer of the thermostats AR 20.. / 40.. C and AR 20.. / 40.. C2 are not electrically compatible. However, a confusion

does not lead to any damage of the devices.

Control
max 5 OEM actuators 24 V
24 V, (19,2 - 35 V) 50/60 Hz
1 A (ohmic load)
10 to 28°C
2 - 6 K
approx. 0,2 K

5°C

-25 to +70 °C
0 to +50 °C
max. 80%

1)

IP 30 / III
EN 60730
ABS
12
74 g without Alpha Mounting Base

80 mm

2)

27 mm

118 mm

1)

not condensing

2)

with Alpha Mounting Base + 8,5 mm

Installation note

Installation and electric connection are only possible using the system
base AS 1000. The system base is not included in the scope of supply
and must be ordered separately; it fits all wired types of the Alpha­Thermostat scope.

1.

2.

Installation can be performed directly to the wall or on a flush-type
box. A 5-wire line (5 x 1.5 NYM) is recommended for the electric
connection.

Recommended place of installation

ca. 30cm

ca.150cm

Note!

In order to ensure a trouble-free
and thus optimum control
operation, a room thermostat
should be installed behind the
door in a quiet zone - free from
environment influence as
draught, humidity, direct sunlight
exposure or other sources of
heat; furthermore, it should not
be covered by curtains.
Otherwise it may occur that
the set room temperature is
exceeded or not achieved,
depending on the respective
environment influence.

Electric installation

Alpha-Thermostat
AR 20.. C2 /
AR 40.. C2

Alpha-Thermostat
AR 20.. K2 /
AR 40.. K2

230V

24V

24V

230V

230V

24V

24V

230V

max. 5 OEM actuator

A 2004 / A 4004

max. 5 OEM actuator

A 2004 / A 4004

further Alpha-Thermostats

230 V AC

24 V AC

LN

L1L2

Diagram for automatic temperature setback
with Alpha-Thermostat Control

Möhlenhoff Wärmetechnik GmbH
Museumstraße 54a
38229 Salzgitter - Germany

Telephone [phone]· 8475-0
Fax [phone]·8475-99

E-Mail: [e-mail]
Internet: www.moehlenhoff.de

Technical changes reserved.

8-D58-40-387. Reprint, in whole or in part, is only admissible with our approval.