Safety Instructions; It Ru - nVent RAYCHEM VIA-DU-20 Mode D'emploi

Symptoms
Heating is OFF although
there is moisture on sensor
Heating is regularly OFF,
but area is not yet free of ice
and snow
Attention: Please change settings step by step to ensure reliable function. Also with careful settings it can't be
guaranteed, that the heated area is always free of snow and ice.
5.5 Servicing
Neither control device nor any of the sensors require any servicing.
The surface of the ground sensor needs to be cleaned regularly, to ensure that it gives correct moisture
measurements. A flannel and tap water may be used. The surface of the sensor must not be scratched with sharp
objects. It is recommended that you check that the device is working before the onset of winter.

6. SAFETY INSTRUCTIONS

Only for electricians!
Attention: mistakes made when connecting up the device can cause damage to the control unit. nVent is not liable
for any damage caused by faulty connections and/or incorrect handling.
– Before working on the device, switch off the power supply.
– The device may only be connected up and serviced by authorised, trained personnel.
– The device is only designed to be connected to fixed cables.
– When installing the device, make sure that high-voltage cables, such as the mains supply and extensions do not
come into contact with low-voltage cables such as sensor cables.
– Moreover, you must ensure adequate protection against all the extension leads disconnecting in compliance with
the requirements of EN 60730, part I. This can be achieved for example by fixing the cables with cable clips.
– Local standards for electrical connection must be observed.
– If the device does not work, please first check all connections and the mains power supply.
Probable
Moisture threshold too high
Temperature threshold too low
The device is set in over- ruling ON and the
logic input is short-circuited
The post-heating period is too short
The sensor is dry, but there is ice and snow
on the heated area
Correction
Set the moisture threshold to a lower value
Set the temperature threshold to a higher value
If necessary change settings
Set a longer post heating period
Set the temperature threshold to a lower value. This
gives a lower set point for sensor heating, too.
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