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External electrical pre-heating element for mounting on top or side
If your ventilation unit is not a Polar version with an integral pre-heating element, it is possible to purchase an external electrical pre-
heating element for frost protection of the ventilation unit.
The electrical pre-heating element is mounted in the outdoor air duct on top or side before the unit with the necessary temperature
sensor.
From the factory the temperatur sensorT1 has been mounted under the outdoor air filter in the unit. Cut off the temperatur sensor T1
and mount the new temperatur sensor T1 according to the enclosed electrical diagram. The new temperatur sensor T1 is mounted in
the outdoor air duct before the pre-heating element.
It is important that the sensor is placed at least 32 cm from the pre-heating element to achieve correct regulation.
The pre-heating element has a three-step safety system that prevents overheating.
An operating thermostat regulates the heating and ensures that the supply air temperature does not
fall below -1 °C
Should the temperature exceed 50 °C, a max. thermostat switches off the pre-heating element. (If in-
stalled vertically with downward airflow, the pre-heating element switches off at 70 °C)
A safety thermostat switches off the pre-heating element if the temperature exceeds 100 °C. Then,
you must reset it manually.
Minimum airflow at Ø160: 110m
3
/h.
ATTENTION
The heating element must be insulated with a fire retardant insulation material. The cover of the Connection Box, how-
ever, must not be insulated.
ATTENTION
When installing the pre-heating element, please ensure that you turn it so you can still easily open the electrical junction
box. .
Dimensional drawing: Positioning options:
T8
230V ~ 50 Hz max. 16A
T1
T1
Green
Green /
white
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