AEG FRTD 903 TC Anleitung Seite 7

FIG. 1 - CONTENT
• Thermostat
• Sensor
The thermostat is an electronic PWM/PI thermostat for temperature
control by means of an NTC sensor located either externally or
internally within the thermostat.
The thermostat is for fl ush mounting in a wall socket. A baseplate
for wall mounting is also available.
This thermostat can be used as a controller for electric room heating
pursuant to EN50559.
Product programme
FRTD 903 TC Clock-thermostat with two sensors:
fl oor sensor and built-in room sensor.
FIG. 2 - WARNING – Important Safety Instructions
Disconnect the power supply before carrying out any installation or
maintenance work on this thermostat and associated components.
The thermostat and associated components should only be installed
by a competent person (i.e. a qualifi ed electrician). Electrical instal-
lation must be in accordance with appropriate statutory regulations.
FIG. 3 - THERMOSTAT PLACEMENT
Mounting of sensor
The fl oor sensor contains a safety extra-low voltage (SELV) circuit,
allowing it to be placed as close to the fl oor surface as possible
without having to take account of the risk of shock should the sen-
sor cable become damaged. The two wires connecting the sensor
to the mounting box must be additionally insulated, e.g. shrink fl ex.
To prevent loose wires in the fi xed installation from coming into
contact with the terminal block for the fl oor sensor, they must be
restrained using cable ties.
It is strongly recommended that the cable and sensor are placed in
a non-conductive installation pipe embedded in the fl oor. The end of
12 © 2016 OJ Electronics A/S - EHT Haustechnik GMBH
FRTD 903 TC
Instruction
English
FRTD 903 TC
the pipe must be sealed and the pipe placed as high as possible in
the concrete layer. Alternatively, the sensor can be embedded di-
rectly in the fl oor. The sensor cable must be led through a separate
conduit or segregated from power cables.
The fl oor sensor must be centred between loops of heating cable.
The sensor cable may be extended up to 100 m by means of a
separate two-core cable. Two vacant wires in a multi-core cable
used, for example, to supply current to the fl oor heating cable must
not be used. The switching peaks of such current supply lines may
create interference signals that prevent optimum thermostat func-
tion. If a shielded cable is used, the shield must not be connected
to earth (PE). The two-core cable must be placed in a separate
pipe or segregated from power cables in some other way.
Mounting of thermostat with built-in sensor
The room sensor is used for comfort temperature regulation in
rooms. The thermostat should be mounted on the wall approx.
1.5 m above the fl oor in such a way as to allow free air circulation
around it. Draughts and direct sunlight or other heat sources must
be avoided.
FIG. 4 - OPENING THE THERMOSTAT
1. Slide the power button down to Off "0".
2. Release the front cover ONLY by inserting a small screwdriver
into the slot at the centre of the bottom side of the front cover to
press and hold the catch securing the front cover.
3. Then carefully pull the front cover away, initially from the lower
part of the thermostat, then from the upper part of the thermo-
stat.
FIG. 5 - CONNECTIONS
Connect the wires in accordance with the diagram. The wires must
be connected as follows:
Term. 1: Neutral (N)
Term. 2: Live (L)
Term. 3-4: Output, max. 16 A
Term. X: Do not connect
Term. 5-6: External fl oor sensor
© 2016 OJ Electronics A/S - EHT Haustechnik GMBH
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