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External pre-heating element
It is possible to purchase an external electric pre-heating element for frost protection of the ventilation unit.
The electric preheating element is mounted in the outdoor air duct before the unit with the necessary temperature sensor.
.
It is important that the sensor is placed at least 32 cm from the preheating element to achieve correct regulation.
The pre-heating element has a three-step safety system that prevents overheating.
9. An operating thermostat regulates the heating and ensures that the supply air temperature does
not fall below -1 °C
10. Should the temperature exceed 50 °C, a max. thermostat switches off the pre-heating element.
(If installed vertically with downward airflow, the pre-heating element switches off at 70 °C)
11. 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.
ATTENSION
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: Positioning options:
7NL 8
T
1x230V ~ 50 Hz max. 16A
Min. 32 cm
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