Mohlenhoff OEM-Actuator 24 V Technical Information
OEM-Actuator 24 V
The OEM-Actuator 24 V is a thermoelectric actuator for opening and
closing valves on heating circuit distributors of concealed floor heating
and cooling systems.
The OEM-Actuator has been developed especially for customerspecific usage in the oem business. Features, as protection in case of
leaky valves, compact and modern casing, versions in normally closed
and normally open, valve adapter concept and an enhanced life time
have been of particular importance. This allows to fulfill the
requirements within the bounds of technical reliability, improved
installation and customer-/service friendliness for manufacturer of
concealed floor heating and cooling systems. Additional
differentiations through customer specific versions are possible.
The OEM-Actuator 24 V is controlled by a 24 V room thermostat with
two-point output or pulse-width modulation.
Technical Information
OEM-Actuator
Actuators
Features
l OEM design
l Compact size, small dimensions
l Available in normally closed (NC) or normally open (NO)
l Patented 100% protection against leaky valves
l All around function indicator
l Maintenance-free
l Noiseless
l High functional safety and long expected service life
l Low power consumption
l 360° installation position
l Snap-on installation
l Valve-adapter concept
l Adaptation check on valve
Application
The OEM-Actuator serves for optimum control of valves on heating
circuit distributors. Control is done a room thermostat
point output or pulse-width modulation.
with two-
General Information
Scope of Supply (standard)
l 1x OEM-Actuator (Version: normally closed)
l 1x cable 1 meter
l 1x installation manual with ten languages
Alternative Version:
l Version normally open
Type
A 4004: Version 24 V normally closed
A 4104: Version 24 V normally open
Optional available extensions:
l First-Open function (only for normally closed)
l non halogen connection cable
l Other cable length are available
Accessories
A valve adapter suiting your application can be enclosed in the
actuator packing.
Customer-specific Version
Customer-specific versions are possible on request.
Functions
In General
The actuator mechanism of the OEM-Actuator uses a PTC resistorheated elastic element and a compression spring. The wax element
is heated by applying the operating voltage and moves the integrated
piston. The force generated by the movement is transferred on the
piston lifter and thus opens and closes the valve.
Standard Version
Normally Closed (valve closed)
The valve is opened steadily by the piston motion upon switching on
the operating voltage and after expiry of the dead time. The wax
element cools down after the operating voltage is cut and after
expiry of the hold time, the valve is closed evenly by the closing force
of the compression spring.
The closing force of the compression spring is matched to the closing
force of commercially available valves and keeps the valve normally
closed.
Valve-Adapter-Concept
A valve-adapter concept guarantees a perfect match of the actuator
to almost any valve bottom or heating circuit distributor available
on the market. Simply snap-on the OEM-Actuator to the pre-installed
valve adapter.
Function Display
The function display of the OEM-Actuator (all-round display) allows
identifying the operating condition (valve open or closed) at a glance.
Extended Version
First-Open function (for NC only)
In its delivery condition, the OEM-Actuator is kept open when deenergised due to the First-Open function (filling). This enables heating
operation during the carcass construction phase even when the
electric wiring is not yet complete. During the later electrical startup, the First-Open function is unlocked by applying the operating
voltage for more than 6 minutes. The OEM-Actuator will then be
completely operable.
Alternative Version
Normally Open (valve open)
In case of the normally open version, ram motion is redirected by
mechanical means, resulting in precisely opposite actuator function.
Ordering Information
Our staff will be glad to assist you in finding the actuator fitting your
application. Call us at: +49 5341 - 84 75 - 0
Technical Information
OEM-Actuator
Technical Data
Type A 4004 / A 4104
Version normally closed / normally open
Voltage 24 V AC/DC, +20%...10%, 060 Hz
Actuators
Max. inrush current 250 mA during 2 min max.
+4 mm
Operating current 75 mA
Operating power 1.8 W
Closing and opening times approx. 3 min.
Actuator travel 4 mm
Actuating force
Fluid temperature 0 - 100 °C
100 N ± 5%
1)
4)
54 mm
Storage temperature -25 to +60°C
Ambient temperature 0 to +60°C
Protection type / protection class IP 54
CE conformity according to EN 60730
Housing / housing colour Polyamide / grey
Weight 100 g with a 1 m connecting cable
Connecting cable / length
3)
2)
/ III
2 x 0.75 mm2 PVC, grey / 1 m
1) in dependence of the adapter even higher
2) in all installation positions
3) special length on demand, but < 5.0 m
4) referring to standard valves
Characteristic Curves
Normally Closed (NC) Normally Open (NO)
stroke [mm]
max
4
3
2
1
0
voltage
on
off
make
dead
time
hold time
voltage on
break
time
time
stroke [mm]
max
4
3
2
1
0
voltage
on
off
make
OEM-Actuator with valve adapter
47 mm
dead
time
voltage on
hold time
break
44 mm
time
time
Planning and Installation Notes
Connections Overview
24 V AC
L1 L2
OEM-Actuator
A 4004 / A 4104
Calculation of maximum cable length (copper cable) for 24 V rated voltage
L = K x A / n
A Conductor cross-section in mm²
n Number of Actuators
K Constant (269 m/mm2)
L Cable length in m
We recommend the following cables for installing a 24 V system:
Bell wire: Y(R) 0,8 mm
Light plastic-sheathed cable: NYM 1,5 mm
Flat webbed building wire: NYIF 1,5 mm
Transformer:
A safey isolating transformer according to EN 61558-2-6 (Europe) or class
II FCC-quality proofed (North America) must always be used. Transformer
dimensioning results from the making capacity of the OEM-Actuators.
Rule-of-thumb formula:P
Möhlenhoff Wärmetechnik GmbH
Museumstraße 54a
38229 Salzgitter / Germany
Transformer
n =
Thermostat
R 20..
time-switch
2
2
2
= 6 W x
number of OEM-Actuators
Telefon +49 (0)53 41· 8475-0
Telefax +49 (0)53 41·8475-99
Installation Positions
Prefered installation positions of the OEM-Acutator are vertical and
horizontal. An up-side down position may reduce product life through
special circumstances (e.g. contaminated water).
Valve Adaptation
Valve adaptation is archived by a valve adapter which is available in
different versions to suit the most common valve bottoms and heating
circuit distributors (please consider when ordering).
E-Mail: contact@moehlenhoff.de
Internet: www.moehlenhoff.com
Technical changes reserved.
8-D58-40-342 Index 25. Reprint, in whole or in part, is only admissible with our approval.
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