Digital Room
Thermostat
for under floor Heating
Instruction
Manual
Model No:- ERT30
General
Congratulations on purchasing a SALUS room thermostat. In buying the ERT 30 model you
have chosen an electronic, digital room temperature control device which offers key benefits
compared with conventional, mechanical products: the control device can be very easily
operated by means of two push buttons and, thanks to its highquality electronics, guarantees
unparalleled ease in controlling all kinds of heating applications. The standard display shows
the current temperature.
Operation
The ERT 30 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 electronic control system ensures that the set room temperature is maintained virtually
without fluctuation and, when required, automatically activates a reduction in temperature.
Each time you press any button, the display’' 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 indicated 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 ERT 30 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 ERT 30 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.
Electronic room thermostat for radiant panel, radiator and convector heating systems
Installation and operating instructions
The ERT 30 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 regulated in such a way that the
temperature is almost completely prevented from exceeding or falling below the set
temperature. In this way, the required temperature setting is regulated in a precise and
convenient way.
Note:
When the ERT 30 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 ERT 30 offers you an opportunity of selecting heating or
cooling operation. 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
considerable periods - e.g. over the summer - the ERT 30 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
ERT 30 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 ERT 30 room thermostat is designed as an electronic, digital temperature controller for
the electrical fine adjustment of hot-water based heating systems, and is used for controlling
electrothermal 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
accordance with the wiring diagram. Installation must also be in accordance with the latest
VDE regulations as well as your electricity supplier‘s regulations. 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 accordingly regulated with precision.
