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Accessories
Electrical pre-heating element for frost protection of the unit
If your ventilation unit is not a Polar version with an integral pre-heating element, we recommend that you
purchase an external pre-heating element as frost protection of the ventilation unit.
During prolonged periods of frost, the high efficiency counterflow heat exchanger will ice up. To prevent ice
formation, we recommend that you install an electrical pre-heating element.
The pre-heating element consumes limited energy and it ensures efficient heat recovery without periods of
defrosting the counterflow heat exchanger. You thereby achieve an overall reduction in energy consump-
tion.
Electrical after-heating element for duct installation
Installing an after-heating element allows you to control the supply air temperature in the following cases:
• You want to use the ventilation air to heat the dwelling
• You want to control the supply air temperature to avoid potential cold draughts and coldness from the
ventilation
The electrical after-heating element is for installation in the supply air duct. It would be an advantage to
place it within the climate screen. It comes with the necessary sensors and connectors.
Water after-heating element incl. control system for duct installation
Installing an after-heating element will allow you to control the supply air temperature in the following
cases:
• You want to use the ventilation air to heat the dwelling
• You want to control the supply air temperature to avoid potential cold draughts and coldness from the
ventilation
The water after-heating element is for installation in the supply air duct. It would be an advantage to place it
within the climate screen. It comes with the necessary sensors and connectors as well as a two-way regula-
tion valve for the hot water.
EM-box
If you want to run the cooker hood via the ventilation unit, in some cases there may be insufficient air for
cooker hood extraction.
If you install an EM-box, you can regulate the extracted air when the cooker hood is in operation, so that less
air is drawn from, for instance, the bathroom and the utility room. This will allow enough air for the cooker
hood to extract sufficiently.
The EM-box is fitted with a metal filter that cleans the air in the cooker hood of grease particles efficiently. It
thereby protects the ventilation unit.
DTBU damper
If there is insufficient space for mounting an EM-box in the installation, you can achieve the same effect by
controlling the extract air with a DTBU damper.
You then have to adjust the duct system yourself with a connection to the cooker hood.
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