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© 2018 OJ Electronics A/S
Model FRTD 903 (S) English
OK
Backlight
ECO
Display illumination
There are three settings for the display back-
lighting:
Auto: Backlighting is activated whenever a
key is pressed and goes out automatically
30 seconds after the last key press.
On: Backlighting continuously on.
Heating active: Backlighting comes on when heat is called for by
the thermostat.
Select the desired backlighting setting and confirm with OK.
OK
Sensor
Selecting the sensor
Floor sensors other than the supplied FRTD
(12 kΩ/ 25°C) can be selected with this
menu. The thermostat is preprogrammed for
4 other types:
Sensor 2 kΩ
Sensor 10 kΩ
Sensor 15 kΩ
Sensor 33 kΩ
Select the installed sensor with the arrow keys, then confirm with
OK. The resistance characteristics of the sensor for 15°C, 20°C,
25C and 30°C are now displayed.
If the installed sensor does not have the same characteristic as
that shown in the thermostat display, change the values at the four
listed temperatures using the arrow keys.
Confirm with OK to switch to the next resistance characteristic.
Select Information with the arrow keys, then confirm with OK.
The display now shows the resistance characteristic of the selected
sensor. Then confirm with OK. The new sensor values are now
stored in the thermostat.
NB! If the incorrect sensor is selected there is a risk that the ther-
mostat will not be able to regulate to the desired temperatures and
therefore damage to the floor construction or covering may occur.
OK
Language
Language
Allows the language used on the display to
be changed.
Press OK and select the required language.
Confirm with OK.
OK
Factory reset
Factory reset
Allows factory settings to be restored. Your
personal settings will be lost, see Factory
settings.
Press OK and choose Reset in the menu.
Confirm with OK.
OK
Information
Information
Displays the thermostat software version.
EN50559
This thermostat complies with EN 50559
(VDE 0705-559) for electrical floor heating.
The regulation applies to electrical floor
heating, with a maximum floor weight of 4
kN/m². To ensure that hotspots due to unintentionally covering up
the surface are avoided, the heating function can be time-limited as
per EN/DIN.
Note that this function is not applicable to other heating applications
such as wall and/or ceiling heating
OK
EN50559
If it can be foreseen in advance that unintentional covering up of a
floor might occur, then it is important to assess the correct period of
time for which the floor heating must be time-limited.
The heating can be limited using a set number between 0 - 15 mi-
nutes per hour. The factory setting is 0 minutes.
Back
In various parts of the menus and submenus you will find the Back
menu item.
Use Back to return to the last step.
Exit
Returns to initial dispay.
Error messages
If a fault or error occurs, the thermostat will display an error code as
follows:
E0: Internal failure. The thermostat is defective. Replace thermostat.
E1: Internal sensor defective or short-circuited.
E2: External sensor defective or short-circuited.
E5: Internal overheating. Inspect the installation.
Factory settings
Preset schedule
Day 1-5
Event Time With floor sensor With room sensor
Day 06:00-08:00 25°C 20°C
Out 08:00-16:00 18°C 13°C
Home 16:00-23:00 25°C 20°C
Night 23:00-06:00 18°C 13°C
Day 6-7
Event Time With floor sensor With room sensor
Day 08:00-23:00 25°C 20°C
Night 23:00-08:00 18°C 13°C
9


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