Product Info

Actuator
Technical Information
OEM-Actuator
OEM-Actuator 24 V
with end-switch (4-wire)
The OEM-Actuator 24 V is a thermoelectric actuator for opening and
closing valves used in the fields of heating, ventilation and air
conditioning engineering. The integrated micro switch with floating
contact allows direct operation of a pump or a fan control unit.
The OEM-Actuator has been developed especially for customer-
specific 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. Additional
differentiations through customer specific versions are possible.
The OEM-Actuator with end switch is controlled by a corresponding
room thermostat with two-point output or pulse-width modulation.
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Two-point control systems in heating, air conditioning and
ventilation systems
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Control of circuit distributors for individual room temperature
control of concealed heating and cooling systems
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Control of radiators, convectors and similar units
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The integrated switch with floating contact allows direct or with
a relay operation of a pump or fan control unit.
Scope of Supply (standard)
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1x OEM-Actuator 24 V with end switch (Version: normally closed)
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1x cable 1 meter
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1x installation manual with ten languages
Alternative Version:
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Version normally open
Type
A 4024: Version 24 V with 24 V end switch  normally closed
A 4124: Version 24 V with 24 V end switch  normally open
Optional available extensions:
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First-Open function (for NC only)
Accessories
A valve adapter suiting your application can be enclosed in the
actuator packing.
Customer-specific Version
Customer-specific versions are possible on request.
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
Features
l OEM design
l Integrated micro switch with floating contact
l Compact size, small dimensions
l Available in normally closed (NC) or normally open (NO)
l Patented protection against leaky valves
l All around function indicator
l Maintenance-free
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
In General
Extended 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.
Functions
Normally Closed (valve closed)
Upon switching on the operating voltage the valve is opened steadily
from the position closed by the ram motion. The integrated micro
switch is closed after an actuator travel of 2 mm. 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. This allows
using the mirco switch signal as a function corresponding to the
opening of the valve. 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 and closed and
positions) at a glance.
Standard Version
Alternative Version
The actuator mechanism of the OEM-Actuator uses a PTC resistor-
heated elastic element and a compression spring. The wax element
is heated by applying the operating voltage and moves the integrated
ram. The force generated by the movement is transferred on the
valve lifter and thus opens and closes the valve.
First-Open Function (for NC only)
In its delivery condition, the OEM-Actuator is normally open due to
the First-Open function. This enables heating operation during the
carcass construction phase even when the electric wiring of the single
room control is not yet complete. When commissioning the system
at a later date, the First-Open function is automatically unlocked by
applying the operating voltage (for more than 6 minutes) and the
OEM-Actuator is fully operable.
Application
General Information