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© 2017 OJ Electronics A/S - EHT Haustechnik GMBH
FTE 400
English
Temperature reading
Defines which temperature is to be shown on the start display: the
setpoint (SP) or the actual, measured temperature.
Adjust offset
If the actual temperature (measured using a thermometer) differs
from that displayed by the thermostat, the thermostat can be
adjusted to offset the difference.
Control method
PWM or ON/OFF control can be selected. PWM is an advanced
control method which calculates the most effective and economi-
cal way to heat homes and other buildings. ON/OFF control is
traditional differential control (e.g. 0.3°C) for other tasks.
PWM cycle time
Allows cycle time to be set when using PWM control. At least 20
min is recommended.
Differential temperature
Allows temperature differential to be set when using ON/OFF con-
trol. The higher the differential temperature, the lower the number
of relay operations.
Relay function
When used for heating purposes, the relay should be in normally
open position (NO). If the thermostat is used for cooling purposes,
the relay should be turned to normally closed (NC).
EN50559
This thermostat complies with EN 50559 (VDE 0705-559) for elec-
trical 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 applica-
tions such as wall and/or ceiling heating
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 by using a set number of minutes per
hour.
The heating can be limited using a set number between 0-15 min-
utes per hour. The factory setting is 0 minutes.
Example:
If obstacles could be present that cover up the floor, then the heat-
ing might need to be limited by some number of minutes so as to
avoid hotspots in the floor.
If you want the thermostat to heat a maximum of 90 % of the time,
then the thermostat should be limited by 10 %.
Ten percent of one hour is 6 minutes.
Enter 6 min. in the EN50559 menu in order to lower the heating by
10 %.
Equation to calculate number of minutes that could be entered in
the EN50559 menu - when an average heating effect is desired:
Average wanted heating effect pr. m
2
Floor heating element effect pr. m
2
(
1-
(
)
)
∗
60 min.
Note! If the result of the equation is negative, then nothing should
be entered.
Software version
Displays thermostat software version.
TROUBLESHOOTING
Factory reset
Allows factory settings to be restored. Your personal settings will
be deleted from the thermostat.
Press and hold the centremost button for 10 seconds. The display
is switched off and then on again. Application is shown on the
display (APp
a
F) followed by the temperature setting.
Error messages
If a fault occurs, the thermostat will display one of the following
error codes:
Error
code
Fault
Remedy
E0
Internal fault. Ther-
mostat defective.
Replace thermostat.
E1
External room sensor
defective or short-
circuited (terminals
10-11).
Replace sensor/sensor
cable. To continue to op-
erate the system without
sensor, set control type
to Regulator under Ap-
plication (
APp
a
C).
E2
External floor sensor
defective or short-
circuited (terminals
8-9).
Replace sensor/sensor
cable. To continue to op-
erate the system without
sensor, set control type
to Regulator under Ap-
plication (
APp
a
C).
E5
Internal overheating.
Thermostat shuts off
heating.
Check installations.
Check that heating ca-
bles are not overloaded
or that ambient tempera-
ture is excessive. When
internal temperature
drops, the thermostat
automatically reactivates.