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Pressure-controlled, dynamic bypass deicing
Deicing - only when necessary - with minimal energy consumption
A counterflow exchanger delivers high heat recovery, but when the outside temperature drops, the moisture in the exhaust air can freeze into ice inside the exchanger. If the ice is allowed to build up, the airflow is reduced, the pressure drop increases, and the heat recovery deteriorates.
Therefore, VEX1000 (EXcon+ automation) continuously monitors operating conditions and automatically activates a modulating bypass deicing when there are signs of ice formation. This maintains a stable, energy-efficient, and safe operation throughout the heating season.
Maximum heat recovery. Minimal deicing
VEX1000 with EXcon+ uses intelligent, pressure-controlled bypass deicing, which is only activated upon real signs of ice formation. We call it PCD (Pressure Controlled Dynamic Deicing). With PCD, unnecessary deicing cycles are avoided, energy consumption is reduced, and heat recovery is maintained at a high level.
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The illustration shows an operational example at an outdoor temperature of -7°C.
When EXcon+ detects signs of ice formation in the heat exchanger, the bypass damper opens gradually, allowing a portion of the cold outside air (here 20%) to bypass the heat exchanger.
The warm exhaust air then helps to quickly melt and remove the ice in the exchanger. 80% of the outside air continues to pass through the heat exchanger and is heated. This ensures energy-efficient operation with minimal energy loss.
The modulating control only opens the bypass damper to the extent necessary. The result is high comfort, safe winter operation, and maximum energy efficiency.
To maintain the desired supply air temperature, it is recommended to install a post-heating coil.
Get answers to your deicing questions
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Yes. While the bypass is active, heat recovery is temporarily reduced. Once the heat exchanger is defrosted, the unit automatically returns to normal operation.
The unit defrosts only when operational conditions require it. The frequency depends on the outside temperature, humidity content, and air volumes.
No. The entire process is controlled automatically by the EXcon+ automation of the VEX1000CS.
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