Carry over control
Smart regulation of purging in rotary heat exchangers for great supply air quality.
Why should you activate it?
All GOLD rotary heat exchangers are equipped with a purging sector — a steel sheet that blocks off part of the rotor for extract air and allows a small amount of outdoor air to purge the rotor. This design minimises contaminants and odors remaining in the extract air to be carried over to the supply air.
However, in systems with demand-controlled ventilation, low airflow can make purging insufficient. When airflow is too low, there may not be enough time for the purging air to effectively flush the rotor, increasing the risk of carry-over. Carry over control addresses this by automatically adjusting the rotor speed to match the airflow, ensuring proper purging and maintaining clean supply air under all operating conditions.
Main benefits
Activating carry over control offers several important benefits for the building and its occupants.
Key benefits include:
- Hygiene and compliance: Ensures clean supply air and meets hygiene standards.
- Reputation protection: Prevents contamination and protects your property’s reputation.
- Automatic operation: Works silently in the background, requiring no manual adjustments.
This function is ideal for hotels, multi-family homes, offices, or any building where high air quality is essential.
The carry over control function controls the speed of the rotor according to the air velocity in order to ensure correct purging. By matching the rotor speed to the airflow, slowing down the rotor if necessary, transfer of extract air to clean air supply is minimised. Thanks to this unique solution, GOLD delivers great supply air quality even for demand-controlled ventilation. Carry over control is included in the standard GOLD control system, no extra accessories are needed!
Learn more about internal leakage in rotary heat exchangers in our technical guide