OJ Electronics MWD5-1999-UAC3, Instructions Manual

8

© 2022 OJ Electronics A/S

© 2022 OJ Electronics A/S

Notice

The language used in the original documentation is 
English.
Other language versions are a translation of the original 
documentation.

The manufacturer cannot be held liable for any errors in the 
documentation. The manufacturer  reserves the right to make 
alterations without prior notice.

Content may vary due to alternative software and/or 
configurations.

Fig. 3 - Thermostat placement
Mounting of sensor

The floor sensor contains a safety extra-low voltage (SELV) circuit, 
allowing it to be placed as close to the floor surface as possible 
without having to take account of the risk of shock should the 
sensor cable become damaged. The two wires connecting the 
sensor to the mounting box must be additionally insulated, e.g. 
shrink flex. 
To prevent loose wires in the fixed installation from coming into 
contact with the terminal block for the floor 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 floor. The end 
of the pipe must be sealed and the pipe placed as high as possible 
in the concrete layer. Alternatively, the sensor can be embedded 
directly in the floor. The sensor cable must be led through a 
separate conduit or segregated from power cables.
The floor 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 floor heating cable must 
not be used. The switching peaks of such current supply lines 
may create interference signals that prevent optimum thermostat 
function. 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.

MWD5-1999-UAC3 English