means of two push buttons and, thanks to its high-
quality electronics, guarantees unparalleled ease in
controlling all kinds of heating applications. The
standard display shows the current temperature.
Operation
The ERT30 electronic room thermostat is used for
regulating the temperature in dry, enclosed rooms
with a normal environment and maximum humidity
of 95% (noncondensing).
The desired temperature can be very quickly and
easily adjusted with the push buttons. This elec-
tronic control system ensures that the set room
temperature is maintained virtually without fluctua-
tion and, when required, automatically activates a
reduction in temperature.
Each time you press any button, the display’s
illumination will automatically switch on. If no input
is made for more than 5 seconds, the illumination
will also switch off again automatically.
Pressing the
+or –buttons will take you to the
display of the desired temperature set. You can
now modify this temperature by pressing the + or –
button again and again, in steps of 0.5K, until you
reach your desired temperature. It is not possible
to set temperatures of below 10°C or above 35°C.
If you do not press any button for more than
5 seconds, the thermostat will automatically adopt
the amended desired temperature and will revert to
the standard display.
By pressing both the
+ and – buttons at the same
time for at least 3 seconds, you will activate or
deactivate the frost protection mode. If the frost
protection mode is activated, this will be indica-
ted by a flashing
symbol in the display. In this
mode, you will not be able to modify the desired
temperature.
Pressing the Reset button will reset the ERT30 to
the factory settings.
If a timer is connected and temperature lowering
is active, this will be displayed by a
symbol in
the display.
If the thermostat requests heat because the actual
temperature is below the desired temperature set,
this will be indicated by
symbol in the display.
Cleaning
Never use anything other than a soft, dry cloth
to clean the unit. Never use any cleaning agents
containing solvents or any sharp objects to clean
the unit!
The following features of the ERT30 guarantee
precise, simple and energy-saving operation of
your room heating system.
Technical characteristics
Frost protection
Frost protection is automatically guaranteed by the
fact that temperatures of below 10°C cannot be set.
By activating the mode for special frost protection
(see above), you can use the thermostat simply as
a frost protection thermostat. In this mode, 5°C will
be set as a fixed value.
Pulse width modulation (PWM)
Radiant panel heating systems tend to have a
problem with overshooting, i.e. rooms continue
to be heated even after the desired temperature
has been reached and the valve has been closed.
The ERT30 solves this problem electronically and
especially effectively using what is known as pulse
width modulation. By continuously comparing set
temperature with actual temperature, the lengths
of opening times for the valve actuators are regu-
lated in such a way that the temperature is almost
completely prevented from exceeding or falling
below the set temperature. In this way, the requi-
red temperature setting is regulated in a precise
and convenient way.
Note:When the ERT30 is used with radiator or
convector heating systems, pulse width modulation
can be switched off if necessary (see Basic settings
section).
Switching over between heating – cooling
The electronic room thermostat ERT30 offers you
an opportunity of selecting heating or cooling ope-
ration. The thermostat is set to heating operation
at the factory. If you want to switch over to cooling
operation, please change over the relevant switch
which you will find under the housing lid (indicated
by “heat” and “cool”). In the event of the thermostat
being changed over to cooling, the pulse-width
modulation will be automatically switched off. The
adjustment to cooling operation will be indicated
in the display by the
symbol.
Valve protection function
To ensure that valves remain movable and ready
for use even when they are unused for consi-
derable periods – e.g. over the summer – the ERT30
includes a valve protection function. Briefly once a
week, even when there is no requirement for any
heat, the valve actuators open the valves that they
control.
Note: The valve protection function can be switched
off if it is not required (see Basic settings section).
Temperature reduction
Timed and demand-oriented heating control are
amongst the best ways of managing heating energy
in an economical way. Thanks to its integrated
temperature lowering function, the ERT30 allows
you to automatically reduce the set heating
temperature by 4K, without having to adjust the
comfort temperature on the thermostat. This ‚night
reduction‘ can be activated by an external signal,
e.g. time control from a terminal strip, or using a
standard external timer.
Installation
The ERT30 room thermostat is designed as an
electronic, digital temperature controller for the
electrical fine adjustment of hot-water based hea-
ting systems, and is used for controlling electro-
thermal valve actuators or other electrical devices.
It is vitally important that the maximum switching
current specified in the technical specifications
should not be exceeded! We are not liable for any
form of improper use.
This equipment must only be installed by an
authorised, qualified engineer, and only in accor-
dance with the wiring diagram. Installation must
also be in accordance with the latest VDE regula-
tions as well as your electricity supplier‘s regula-
tions. The system must be in a de-energised state
whilst installation is carried out, and all safety
instructions must be followed to the letter.
Find a position for the thermostat where it is not
covered by curtains, furniture or anything else.
The controller must not be installed too close to
any heat source (lights, stove, direct sunlight etc.),
nor should it be installed in a position where it will
be exposed to draughts. The controller must be
installed in a suitable location in order for room
temperature to be monitored accurately and accor-
dingly regulated with precision.
Important:
The thermostat must be disconnected from its
power supply before its housing is opened.
Wall mounting
The housing cover must be separated from the
base plate before the controller is fitted. Follow the
steps listed below:
Loosen the screw on the underside.1.
Open the housing by removing and then lifting 2.
off the housing lid on the underside.
Now fix the base plate with the screws supplied 3.
on the wall or on the flush mounting box.
Factory setting
- Display of actual temperature in °C
- Normal operation (not lowered)
- Desired temperature 20°C
Basic settings
The jumpers on the PCB can be used to turn on or
off various functions of the ERT30:
ERT30 Jumpers
Switch
FunctionONOFF
VP
Valve protection
function
PWM
Pulse width modulation
Temperature reduction
The factory setting for all these functions is ON.
You can change these settings according to your
own requirements by moving the contact terminals
on the jumpers.
As long as the installation is carried out to a pro-
fessional standard, the criteria for protection class
II will be satisfied.
Explanation of symbols
ERT30 symbolMeaning
Temperature lowering active
Heat requested
flashing
Frost protection mode active
Cooling operation active
Technical data
Product no.:112.309
Voltage supply:
2 x Batteries size AA (internal)
230VAC / 50Hz (external)
Electronic switch output
Max. switching current:10 (2) A
Max. no. of
valve actuators:5 units - 3W
Hysteresis0.5K
Protection class:IP 30
Dimensions W/H/D:75 mm / 130 mm / 30 mm
Temperature range:5°C - 30°C
Storage temperature:-25°C - 65°C
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