External electrical pre-heating element
If your unit is not the Polar version with an integrated pre-heating element, you can purchase and
retrofit an external electrical pre-heating element.
Install the electrical pre-heating element together with the required temperature sensor in the
outdoor air duct before the unit.
7 8
T
In order to achieve effective regulation, it is important that the temperature sensor is placed at least
32 cm from the pre-heating element.
The pre-heating element has a three-step safety system that prevents overheating.
1. An operating thermostat regulates the heating and ensures that the supply air temperature does
not fall below -1 °C
2. There is a max. thermostat, which shuts down the preheating element if the temperature rises
above 50 °C (For vertical mounting with airflow downwards, the preheating surface will switch off
at 70 ° C).
3. A safety thermostat switches off the pre-heating element if the temperature exceeds 100 °C.
Then, you must reset it manually.
4. Minimum air volume at Ø160. 110 m3/h
ATTENTION
The heating element must be insulated with a fire retardant insulation material. The cover of
the connection box, however, must not be insulated.
Dimensional drawing:
Ø160
370
50
50
50
Positioning options:
VP18 M2 (English) BY NILAN
17
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